CN113443846A

CN113443846A - High-strength magnesium oxysulfate cement and preparation method and application thereof

Info

Publication number: CN113443846A
Application number: CN202110812803.7A
Authority: CN
Inventors: 潘旭鹏
Original assignee: Baotou Jianqiang Light Board Industry Co ltd
Current assignee: Baotou Jianqiang Light Board Industry Co ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2021-09-28

Abstract

The invention discloses a high-strength magnesium oxysulfate cement and a preparation method and application thereof, wherein the used raw materials comprise magnesium oxide, magnesium sulfate, a modifier and aggregate, and the weight ratio of the magnesium oxide to the magnesium sulfate is 1:0.7-0.9 percent of modifier, 3.8-7.1 percent of magnesium sulfate, 9-18 percent of auxiliary material, 1-2 percent of aggregate and magnesium oxide: 1. according to the application, a ternary gel phase can be formed by proportioning magnesium oxide and magnesium sulfate solution according to a weight ratio, the phase structure is stable, the net slurry strength is as high as about 40MPa, the water resistance and the bonding strength can be modified by adding a modifier, and finally, quartz sand aggregate is added to further improve the water resistance and the compressive strength, so that the high-strength magnesium oxysulfate cement is finally formed by optimizing the proportioning of the three aspects, the compressive strength is as high as more than 60MPa, the bonded tensile strength is about 6MPa, and the softening coefficient in a water resistance test can reach 0.98.

Description

High-strength magnesium oxysulfate cement and preparation method and application thereof

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to high-strength magnesium oxysulfate cement and a preparation method and application thereof.

Background

The magnesium oxysulfate cement belongs to an air-hardening inorganic cementing material, has the advantages of light weight, fire resistance, water resistance and the like compared with common cement, overcomes the defects of moisture absorption and halogen return of magnesium oxychloride cement compared with magnesium oxychloride cement, but also has the defects of easy cracking, deformation, low strength and the like.

The invention patent with the Chinese patent application number of CN202011576393.2 discloses a basic magnesium sulfate cement concrete casting material for an assembly type building node, wherein the casting material comprises a dry mixture and water, basic magnesium sulfate is used as a matrix, and the dry mixture comprises the following raw materials in parts by mass: 100 parts of magnesium oxide, 0.05-10 parts of admixture, 5-60 parts of magnesium sulfate, 0-300 parts of filler, 200 parts of sand 130-; wherein the additive is a mixture of 517 crystal nucleus inducer and one or more of sodium dihydrogen phosphate, sodium hydrogen phosphate and trisodium phosphate, wherein the 517 crystal nucleus inducer is 5Mg (OH)₂·MgSO₄·7H₂And O. The invention has the compression strength of less than 60MPa and has the problems of easy cracking and the like.

Disclosure of Invention

The invention aims to provide high-strength magnesium oxysulfate cement and a preparation method and application thereof, wherein a ternary gel phase (517 phase) can be formed by proportioning magnesium oxide with the activity of more than 60 and magnesium sulfate solution with the Baume degree of 28-30 according to the weight ratio, the 517 phase has a stable structure, the net slurry strength reaches about 50MPa, the water resistance and the bonding strength of the magnesium oxysulfate cement can be improved by adding a modifier, the deformation and cracking of the magnesium oxysulfate cement can be improved by adding auxiliary materials, and finally, the water resistance and the compressive strength are further improved by adding aggregate, so that the high-strength magnesium oxysulfate cement is finally formed by optimizing the proportioning in the aspects, the compressive strength reaches over 60MPa, the bonded tensile strength reaches about 6MPa, and the softening coefficient of a water resistance test reaches 0.98. The most common C30 concrete for civil buildings has a compressive strength of only 30MPa, a bonding tensile strength of only about 3MPa and a softening coefficient of only about 0.85. By comparison, the indexes of the magnesium oxysulfate cement prepared by the method are all higher than those of C30 concrete.

The invention discloses high-strength magnesium oxysulfate cement, which comprises the following raw materials of magnesium oxide, magnesium sulfate, a modifier, auxiliary materials and aggregate, wherein the weight ratio of the magnesium oxide to the magnesium sulfate is 1:0.7-0.9 percent of modifier, 3.8-7.1 percent of magnesium sulfate, 9-18 percent of auxiliary material, 1-2 percent of aggregate and magnesium oxide: 1.

preferably, the weight ratio of magnesium oxide to magnesium sulfate is 1: 0.7.

preferably, in any of the above embodiments, the weight ratio of magnesium oxide to magnesium sulfate is 1: 0.8.

preferably, in any of the above embodiments, the weight ratio of magnesium oxide to magnesium sulfate is 1: 0.9.

preferably, in any of the above embodiments, the MgSO₄The baume degree of the solution is 25-32 Be.

Preferably, in any of the above embodiments, the MgSO₄The solution has a baume degree of 25 ° baume.

Preferably, in any of the above embodiments, the MgSO₄The baume degree of the solution is 28-30 Be.

Preferably, in any of the above embodiments, the MgSO₄The solution had a baume degree of 28 ° baume.

Preferably, in any of the above embodiments, the MgSO₄The solution had a baume degree of 29 ° baume.

Preferably, in any of the above embodiments, the MgSO₄The solution had a baume degree of 30 ° baume.

Preferably, in any of the above embodiments, the MgSO₄The solution had a baume degree of 32 ° baume.

In any of the above embodiments, preferably, the modifier is present in an amount of 4% to 7% by weight of the magnesium sulfate.

Preferably in any of the above embodiments, the modifier is present in an amount of 4.5% to 6% by weight of the magnesium sulphate.

Preferably in any of the above embodiments, the modifier comprises 3.8% by weight of the magnesium sulphate.

Preferably in any of the above embodiments, the modifier comprises 4% by weight of the magnesium sulphate.

Preferably in any of the above embodiments, the modifier comprises 4.5% by weight of the magnesium sulphate.

Preferably in any of the above embodiments, the modifier comprises 5% by weight of the magnesium sulphate.

Preferably in any of the above embodiments, the modifier comprises 5.5% by weight of the magnesium sulphate.

Preferably in any of the above embodiments, the modifier comprises 6% by weight of the magnesium sulphate.

Preferably in any of the above embodiments, the modifier comprises 7% by weight of the magnesium sulphate.

In any of the above embodiments, preferably, the modifier is one or more of citric acid, solid phosphoric acid, calcium formate, redispersible latex powder, water glass, oxalic acid, and hydroxypropyl methyl cellulose.

In any of the above embodiments, preferably, the modifier includes one or more of citric acid, oxalic acid, water glass, and solid phosphoric acid.

Preferably, in any of the above embodiments, the modifier comprises citric acid, oxalic acid, water glass, and solid phosphoric acid.

Preferably in any of the above embodiments, the modifier comprises magnesium sulfate (MgSO)₄·7H₂O) 2 to 2.3 percent of citric acid, 0.3 to 0.8 percent of oxalic acid, 1 to 3 percent of water glass and 0.5 to 1 percent of solid phosphoric acid.

Preferably, in any of the above schemes, the modifier comprises 2% -2.2% of citric acid, 0.4% -0.7% of oxalic acid, 1.5% -2.5% of water glass and 0.6% -0.8% of solid phosphoric acid by weight of magnesium sulfate.

Preferably, in any of the above embodiments, the modifier comprises 2% citric acid, 0.3% oxalic acid, 1% water glass, and 0.5% solid phosphoric acid based on the weight of magnesium sulfate.

Preferably, in any of the above embodiments, the modifier comprises 2% citric acid, 0.4% oxalic acid, 1.5% water glass, and 0.6% solid phosphoric acid based on the weight of magnesium sulfate.

Preferably, in any of the above embodiments, the modifier comprises 2.2% citric acid, 0.5% oxalic acid, 2% water glass, and 0.8% solid phosphoric acid by weight of magnesium sulfate.

Preferably, in any of the above embodiments, the modifier comprises 2.2% citric acid, 0.7% oxalic acid, 2.5% water glass, and 0.8% solid phosphoric acid by weight of magnesium sulfate.

In any of the above schemes, preferably, the auxiliary material accounts for 10% -17% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material accounts for 9% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material accounts for 12% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material accounts for 15% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material accounts for 18% of the weight of the magnesium oxide.

Preferably, in any of the above schemes, the auxiliary material includes at least one of silicon powder, fly ash and sodium tripolyphosphate.

In any of the above schemes, preferably, the auxiliary materials include silica powder 3% -5%, fly ash 5% -10%, and sodium tripolyphosphate 1% -3% of the weight of magnesium oxide.

In any of the above schemes, preferably, the auxiliary materials include silicon powder accounting for 3.5-4.5% of the weight of the magnesium oxide, fly ash accounting for 6-8% of the weight of the magnesium oxide, and sodium tripolyphosphate accounting for 1.5-2.5% of the weight of the magnesium oxide.

In any of the above schemes, preferably, the auxiliary materials include silica powder 3% by weight of magnesium oxide, fly ash 5% by weight of magnesium oxide, and sodium tripolyphosphate 1% by weight of magnesium oxide.

Preferably, in any of the above schemes, the auxiliary materials include silicon powder accounting for 3.5% of the weight of the magnesium oxide, 6% of the fly ash and 1.5% of the sodium tripolyphosphate.

In any of the above schemes, preferably, the auxiliary materials include silicon powder accounting for 4% of the weight of the magnesium oxide, 7% of the fly ash and 2% of the sodium tripolyphosphate.

Preferably, in any of the above schemes, the auxiliary materials include silicon powder accounting for 4.5% of the weight of the magnesium oxide, fly ash accounting for 8% of the weight of the magnesium oxide, and sodium tripolyphosphate accounting for 2.5% of the weight of the magnesium oxide.

Preferably, in any of the above schemes, the auxiliary materials include silicon powder accounting for 5% of the weight of the magnesium oxide, 10% of the fly ash and 3% of the sodium tripolyphosphate.

Preferably, in any of the above embodiments, the weight ratio of the aggregate to the magnesium oxide is 1-2: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide is 1-1.5: 1.

preferably, in any of the above embodiments, the weight ratio of the aggregate to the magnesium oxide is 1: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide is 1.3-1.7: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide is 1.3: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide is 1.5: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide is 1.7: 1.

preferably, in any of the above embodiments, the weight ratio of the aggregate to the magnesium oxide is 2: 1.

in any of the above embodiments, preferably, the aggregate includes magnesia quartz sand and/or colored sand.

In any of the above schemes, preferably, the content of the magnesium oxide active substance is not less than 60%, and the purity of MgO is not less than 82%.

In any of the above schemes, preferably, the content of the magnesium oxide active substance is 65% ± 2%, and the purity of the MgO is 85% + 2%.

Preferably, in any of the above schemes, the magnesium sulfate is magnesium sulfate heptahydrate, MgSO₄The content is more than or equal to 47 percent and MgSO₄·7H₂The purity of O is more than or equal to 99 percent.

In any of the above schemes, preferably, the aggregate is quartz sand and/or colored sand.

In any of the above schemes, preferably, the quartz sand and/or the color sand are 3-10 meshes.

The invention also discloses a preparation process of the high-strength magnesium oxysulfate cement, which comprises the following steps:

(1) the weight ratio of the magnesium oxide to the magnesium sulfate solution is 1:0.7-0.9, and evenly mixing to form a ternary gelled phase;

(2) adding a modifier on the basis of the step (1), wherein the modifier accounts for 3.8-7.1% of the magnesium sulfate;

(3) adding auxiliary materials, wherein the auxiliary materials account for 9-18% of the weight of the magnesium oxide;

(4) adding aggregate, wherein the weight ratio of the aggregate to the magnesium oxide is 1-2: 1.

preferably, the weight ratio of magnesium oxide to magnesium sulfate in the step (1) is 1: 0.7.

in any of the above schemes, preferably, the weight ratio of magnesium oxide to magnesium sulfate in step (1) is 1: 0.8.

in any of the above schemes, preferably, the weight ratio of magnesium oxide to magnesium sulfate in step (1) is 1: 0.9.

in any of the above embodiments, it is preferable that MgSO is used in the step (1)₄The baume degree of the solution is 25-32 Be.

In any of the above embodiments, it is preferable that MgSO is used in the step (1)₄The baume degree of the solution is 28-30 Be.

In any of the above embodiments, it is preferable that MgSO is used in the step (1)₄The solution has a baume degree of 25 ° baume.

In any of the above embodiments, it is preferable that MgSO is used in the step (1)₄The solution had a baume degree of 28 ° baume.

In any of the above embodiments, it is preferable that MgSO is used in the step (1)₄The solution had a baume degree of 29 ° baume. In any of the above embodiments, it is preferable that MgSO is used in the step (1)₄The solution had a baume degree of 30 ° baume.

In any of the above embodiments, it is preferable that MgSO is used in the step (1)₄The solution had a baume degree of 32 ° baume.

In any of the above embodiments, preferably, the modifier in step (2) includes citric acid, oxalic acid, water glass, and solid phosphoric acid.

In any of the above schemes, preferably, the modifier in the step (2) accounts for 4-7% of the weight of the magnesium sulfate.

In any of the above embodiments, it is preferable that the modifier in the step (2) accounts for 4.5% to 6% of the weight of the magnesium sulfate.

In any of the above embodiments, preferably, the modifier in the step (2) accounts for 3.8% of the weight of the magnesium sulfate.

In any of the above embodiments, it is preferable that the modifier in the step (2) accounts for 4% of the weight of the magnesium sulfate.

In any of the above embodiments, it is preferable that the modifier in the step (2) accounts for 4.5% of the weight of the magnesium sulfate.

In any of the above embodiments, preferably, the modifier in the step (2) accounts for 5% of the weight of the magnesium sulfate.

In any of the above embodiments, preferably, the modifier in the step (2) accounts for 5.5% of the weight of the magnesium sulfate.

In any of the above embodiments, preferably, the modifier in the step (2) accounts for 6% of the weight of the magnesium sulfate.

In any of the above embodiments, it is preferable that the modifier in the step (2) accounts for 7% of the weight of the magnesium sulfate.

In any of the above schemes, preferably, the modifier in the step (2) comprises 2% -2.3% of citric acid, 0.3% -0.8% of oxalic acid, 1% -3% of water glass and 0.5% -1% of solid phosphoric acid by weight of magnesium sulfate.

In any of the above schemes, preferably, the modifier in the step (2) comprises 2% -2.2% of citric acid, 0.4% -0.7% of oxalic acid, 1.5% -2.5% of water glass and 0.6% -0.8% of solid phosphoric acid by weight of magnesium sulfate.

In any of the above embodiments, preferably, the modifier in step (2) comprises 2% citric acid, 0.3% oxalic acid, 1% water glass, and 0.5% solid phosphoric acid by weight of magnesium sulfate.

In any of the above embodiments, preferably, the modifier in step (2) comprises 2% citric acid, 0.4% oxalic acid, 1.5% water glass, and 0.6% solid phosphoric acid by weight of magnesium sulfate.

In any of the above embodiments, preferably, the modifier in step (2) comprises 2.2% citric acid, 0.5% oxalic acid, 2% water glass, and 0.8% solid phosphoric acid by weight of magnesium sulfate.

In any of the above embodiments, preferably, the modifier in step (2) comprises 2.2% citric acid, 0.7% oxalic acid, 2.5% water glass, and 0.8% solid phosphoric acid by weight of magnesium sulfate.

In any of the above schemes, preferably, the auxiliary material in step (3) includes at least one of silicon powder, fly ash and sodium tripolyphosphate.

In any of the above schemes, preferably, the auxiliary materials in step (3) include silicon powder 3% -5%, fly ash 5% -10%, and sodium tripolyphosphate 1% -3% of the weight of magnesium oxide.

In any of the above schemes, preferably, the auxiliary materials in step (3) include silicon powder 3.5% -4.5% of the weight of magnesium oxide, fly ash 6% -8%, and sodium tripolyphosphate 1.5% -2.5%.

In any of the above schemes, preferably, the auxiliary materials in step (3) include silicon powder 3% by weight of magnesium oxide, fly ash 5% by weight of magnesium oxide, and sodium tripolyphosphate 1% by weight of magnesium oxide.

In any of the above schemes, preferably, the auxiliary materials in step (3) include silicon powder 3.5% of the weight of magnesium oxide, 6% of fly ash, and 1.5% of sodium tripolyphosphate.

In any of the above schemes, preferably, the auxiliary materials in step (3) include silicon powder 4% by weight of magnesium oxide, fly ash 7% by weight of magnesium oxide, and sodium tripolyphosphate 2% by weight of magnesium oxide.

In any of the above schemes, preferably, the auxiliary materials in step (3) include silicon powder 4.5% of the weight of magnesium oxide, fly ash 8%, and sodium tripolyphosphate 2.5%.

In any of the above schemes, preferably, the auxiliary materials in step (3) include silicon powder 5% by weight of magnesium oxide, fly ash 10% by weight of magnesium oxide, and sodium tripolyphosphate 3% by weight of magnesium oxide.

In any of the above schemes, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (4) is 1.3-1.7: 1.

in any of the above schemes, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (4) is 1: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (4) is 1.3: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (4) is 1.5: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (4) is 1.7: 1.

in any of the above schemes, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (4) is 2: 1.

in any of the above schemes, preferably, the aggregate in the step (4) is quartz sand and/or colored sand.

The invention also discloses another preparation process of the high-strength magnesium oxysulfate cement, which comprises the following steps:

(1) preparing a component A: handle H₂O and MgSO₄·7H₂Stirring and uniformly mixing O according to the mass ratio of 1:1, adding a modifier, wherein the modifier accounts for MgSO₄·7H₂3.8 to 7.1 percent of O, evenly stirring and barreling for later use;

(2) preparing a component B: uniformly mixing the aggregate and magnesium oxide according to the mass ratio of 1-2:1, then adding auxiliary materials, wherein the auxiliary materials account for 9-18% of the weight of the magnesium oxide, uniformly mixing and packaging for later use;

(3) mixing the component A prepared in the step (1) and the component B prepared in the step (2), wherein the mass ratio of magnesium oxide in the component A to magnesium oxide in the component B is 0.7-0.9.

Preferably, the modifier in step (1) is MgSO₄·7H₂4-7% of the mass of O.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H₂4.5-6% of the mass of O.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H₂3.8 percent of the mass of O.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H ₂4% of the mass of O.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H₂4.5% of the mass of O.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H₂Quality of O5% of the amount.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H₂5.5% of the mass of O.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H ₂6 percent of the mass of O.

Preferably in any of the above embodiments, the modifier in step (1) is MgSO₄·7H₂7% of the mass of O.

In any of the above embodiments, preferably, the modifier in step (1) is one or more of citric acid, solid phosphoric acid, calcium formate, redispersible latex powder, water glass, oxalic acid, and hydroxypropyl methyl cellulose.

In any of the above schemes, preferably, the modifier in step (1) includes one or more of citric acid, oxalic acid, water glass, and solid phosphoric acid.

In any of the above embodiments, preferably, the modifier in step (1) includes citric acid, oxalic acid, water glass, and solid phosphoric acid.

Preferably in any of the above embodiments, the modifier in step (1) comprises magnesium sulfate (MgSO)₄·7H₂O) 2 to 2.3 percent of citric acid, 0.3 to 0.8 percent of oxalic acid, 1 to 3 percent of water glass and 0.5 to 1 percent of solid phosphoric acid.

Preferably in any of the above embodiments, the modifier in step (1) comprises magnesium sulfate (MgSO)₄·7H₂O) 2 to 2.2 percent of citric acid, 0.4 to 0.7 percent of oxalic acid, 1.5 to 2.5 percent of water glass and 0.6 to 0.8 percent of solid phosphoric acid.

Preferably in any of the above embodiments, the modifier in step (1) comprises magnesium sulfate (MgSO)₄·7H₂O) 2% by weight of citric acid, 0.3% of oxalic acid, 1% of water glass, 0.5% of solid phosphoric acid.

Preferably in any of the above embodiments, the modifier in step (1) comprises magnesium sulfate (MgSO)₄·7H₂O) 2% by weight of citric acid, 0.4% of oxalic acid, 1.5% of water glass, 0.6% of solid phosphoric acid.

In any of the above embodiments, preferably, the step (1) is performed in the presence of a catalystThe modifier comprises magnesium sulfate (MgSO)₄·7H₂O) 2.2% citric acid, 0.5% oxalic acid, 2% water glass, 0.8% solid phosphoric acid.

Preferably in any of the above embodiments, the modifier in step (1) comprises magnesium sulfate (MgSO)₄·7H₂O) 2.2% citric acid, 0.7% oxalic acid, 2.5% water glass, 0.8% solid phosphoric acid.

In any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (2) is 1-1.5: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (2) is 1: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (2) is 1.3-1.7: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (2) is 1.3: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (2) is 1.5: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (2) is 1.7: 1.

in any of the above embodiments, preferably, the weight ratio of the aggregate to the magnesium oxide in the step (2) is 2: 1.

in any of the above schemes, preferably, the aggregate in step (2) includes quartz sand and/or colored sand, and the quartz sand and/or colored sand is dry and has no moisture and no impurities.

In any of the above schemes, preferably, the auxiliary material in the step (2) accounts for 10% -17% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material in the step (2) accounts for 9% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material in the step (2) accounts for 12% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material in the step (2) accounts for 15% of the weight of the magnesium oxide.

In any of the above embodiments, preferably, the auxiliary material in the step (2) accounts for 18% of the weight of the magnesium oxide.

In any of the above schemes, preferably, the auxiliary material in step (2) includes at least one of silicon powder, fly ash and sodium tripolyphosphate.

In any of the above schemes, preferably, the auxiliary materials in the step (2) include silicon powder 3% -5%, fly ash 5% -10%, and sodium tripolyphosphate 1% -3% of the weight of magnesium oxide.

In any of the above schemes, preferably, the auxiliary materials in the step (2) include silicon powder accounting for 3.5% -4.5% of the weight of the magnesium oxide, 6% -8% of the fly ash, and 1.5% -2.5% of the sodium tripolyphosphate.

In any of the above schemes, preferably, the auxiliary materials in step (2) include silicon powder 3% of the weight of magnesium oxide, fly ash 5%, and sodium tripolyphosphate 1%.

In any of the above schemes, preferably, the auxiliary materials in step (2) include silicon powder 3.5% of the weight of magnesium oxide, fly ash 6%, and sodium tripolyphosphate 1.5%.

In any of the above schemes, preferably, the auxiliary materials in step (2) include silicon powder 4% by weight of magnesium oxide, fly ash 7% by weight of magnesium oxide, and sodium tripolyphosphate 2% by weight of magnesium oxide.

In any of the above schemes, preferably, the auxiliary materials in step (2) include silicon powder 4.5% of the weight of magnesium oxide, fly ash 8%, and sodium tripolyphosphate 2.5%.

In any of the above schemes, preferably, the auxiliary materials in step (2) include silicon powder 5% by weight of magnesium oxide, fly ash 10% by weight of magnesium oxide, and sodium tripolyphosphate 3% by weight of magnesium oxide.

In any of the above embodiments, it is preferable that the mass ratio of magnesium oxide in the a component and the B component in the step (3) is 0.7.

In any of the above embodiments, it is preferable that the mass ratio of magnesium oxide in the a component to the B component is 0.75.

In any of the above embodiments, it is preferable that the mass ratio of magnesium oxide in the a component to the B component is 0.8.

In any of the above embodiments, it is preferable that the mass ratio of magnesium oxide in the a component to the B component is 0.9.

The invention also discloses application of the high-strength magnesium oxysulfate cement in the field of buildings. Such as for making inorganic keels, support columns, etc.

The magnesium oxysulfate cement is alkaline, is added with a modified material, is optimized in aspects of strength, water resistance, cohesiveness and the like, is suitable for various building boards, fire-proof plates, fire-proof door cores, fire-proof isolation belts, heat-insulation plates, sound-insulation plates, siliceous modified plates, building molds, sewer manhole covers, pouring materials for replacing concrete, can be used as a binder, can simulate marble and the like, and is wide in application range.

The assembled inorganic keel prepared by adopting the high-strength magnesium oxysulfate cement comprises at least one inorganic keel vertical plate, an inorganic keel reinforcing cover plate is clamped on at least one side of the inorganic keel vertical plate, at least one surface of the single inorganic keel cover plate contains a fiber reinforcing layer and/or the inside of the inorganic keel cover plate contains a reinforcing rib layer.

Advantageous effects

(1) The invention discloses a high-strength magnesium oxysulfate cement and a preparation method thereof, which utilizes magnesium oxide with activity more than 60 and magnesium sulfate solution with Baume degree of 30 to prepare the high-strength magnesium oxysulfate cement according to the weight ratio of 1:0.7-0.9, a ternary gelled phase (517 phase) can be formed, the 517 phase structure is stable, the net slurry strength is as high as about 40MPa, the problems of poor water resistance and the like caused by independently adopting a citric acid modifier are solved by adding the modifier with the optimal proportion, and the modifier comprises: citric acid 2% -2.3% (of MgSO)₄·7H₂O weight), oxalic acid 0.3% -0.8% (accounting for MgSO₄·7H₂O weight) and water glass 1-3% (of MgSO₄·7H₂O weight), solid phosphoric acid 0.5% -1% (accounting for MgSO₄·7H₂O weight) modifiable water resistance and adhesive strength; by incorporating adjuvants: 3 to 5 percent of silicon powder (accounting for the weight of MgO), 5 to 10 percent of fly ash (accounting for the weight of MgO) and 1 to 3 percent of sodium tripolyphosphate (accounting for the weight of MgO), can improve the deformation and cracking of the magnesium oxysulfate cement; finally, 1-2 times of quartz sand aggregate (accounting for the weight of MgO) is added to further improve the flexural strength and the compressive strength of the magnesium oxysulfate cement, and the high-strength magnesium oxysulfate cement is finally formed by optimizing the proportion of the three aspects, the compressive strength is up to more than 60MPa, the bonded tensile strength is up to about 6MPa, the softening coefficient in a water resistance test can reach 0.98, and the most commonly used C30 concrete for civil buildingsThe compressive strength of the soil is only 30MPa, the tensile strength of the bonding is only about 3MPa, and the softening coefficient is only about 0.85. By comparison, the indexes of the magnesium oxysulfate cement prepared by the method are all higher than those of C30 concrete.

(2) The method summarizes and optimizes a high-strength magnesium oxysulfate cement prepared by adding a modifier, auxiliary materials and aggregate in an optimal molar ratio (which is the molar ratio of active magnesium oxide to magnesium sulfate) through a large number of experimental comparisons. The magnesium oxysulfate cement prepared by the method has the characteristics of high strength, difficult cracking and deformation, strong bonding force, good water resistance, lower cost, simple operation and the like.

(3) In order to facilitate production and transportation and to facilitate operation, the application provides a method for premixing high-strength magnesium oxysulfate cement in advance, raw materials are mixed in advance, the raw materials are divided into A, B components to be packaged for later use, and the high-strength magnesium oxysulfate cement can be used only by mixing the components in proportion when arriving at a site.

Drawings

FIG. 1 is a schematic structural view of a preferred embodiment of the assembled inorganic keel I and assembled partition thereof after assembly according to the invention;

FIG. 2 is a schematic structural view of a preferred embodiment of the assembled partition of the present invention using "I-shaped" assembled inorganic keels;

FIG. 3 is a schematic structural view of a preferred embodiment of the assembled partition of the present invention using "U" -shaped assembled inorganic keels;

fig. 4 is a schematic structural view of a preferred embodiment of the inorganic keel vertical plate of the invention.

In the figure, 1, an inorganic keel vertical plate; 2. an inorganic keel reinforced cover plate; 3. a connecting member; 4. a partition panel; 6. a straight plate; 7. a support daughter board A; 8. a support daughter board B; 9. supporting the side plate; 10. a buffer plate; 11. plate peak; 12. and (7) plate valleys.

Detailed Description

The following examples are further illustrative of the present invention as to the technical content of the present invention, but the essence of the present invention is not limited to the following examples, and one of ordinary skill in the art can and should understand that any simple changes or substitutions based on the essence of the present invention should fall within the protection scope of the present invention.

Example 1

The high-strength magnesium oxysulfate cement comprises the following raw materials of magnesium oxide, magnesium sulfate, a modifier, auxiliary materials and aggregate, wherein the weight ratio of the magnesium oxide to the magnesium sulfate is 1:0.7, the weight ratio of the aggregate to the magnesium oxide is 1.2: 1.

magnesium oxide in the present example: the active MgO active content is more than or equal to 60 percent, and the optimal active MgO content is as follows: 65% +/-2%, MgO purity is more than or equal to 82%, and the optimal MgO purity is as follows: 85% + 2%

The magnesium sulfate in this example is magnesium sulfate heptahydrate, MgSO₄The content is more than or equal to 47 percent and MgSO₄·7H₂O purity is not less than 99%, H₂O:MgSO₄·7H₂O1: 1 (MgSO 2)₄Solution 30 ° be mass ratio).

The modifier in the embodiment comprises citric acid, oxalic acid, water glass and solid phosphoric acid, wherein the purity of the citric acid is more than or equal to 99.5 percent, and the impurity is less than or equal to 0.5 percent. The solid phosphoric acid is powdery solid and is easy to dissolve in water, and the content of effective substances is more than or equal to 98 percent; the oxalic acid is more than or equal to 99 percent of industrial grade; the baume degree of the water glass is 40 degrees +/-2 degrees, and the modulus M is 3.2 +/-0.5.

Specifically, the modifier comprises citric acid accounting for 2.2 percent of the weight of the magnesium sulfate, oxalic acid accounting for 0.5 percent of the weight of the magnesium sulfate, water glass accounting for 2 percent of the weight of the magnesium sulfate, and solid phosphoric acid accounting for 0.8 percent of the weight of the magnesium sulfate.

The auxiliary materials in the embodiment comprise silicon powder, fly ash and sodium tripolyphosphate.

Specifically, the auxiliary materials comprise silicon powder accounting for 3% of the weight of the magnesium oxide, fly ash accounting for 5% of the weight of the magnesium oxide, and sodium tripolyphosphate accounting for 1% of the weight of the magnesium oxide.

The aggregate in the embodiment is quartz sand, and the granularity is as follows: 3-10 meshes, and the density of the quartz sand is more than or equal to 2.5g/cm²The loss on ignition is less than or equal to 0.7 percent, and the mud content is less than or equal to 1 percent.

The preparation process of the high-strength magnesium oxysulfate cement comprises the following steps of:

the magnesium oxide and magnesium sulfate solution in the step (1) is prepared from the following raw materials in parts by weight of 1:0.7, uniformly mixing to form a ternary gelled phase;

step (2) adding citric acid accounting for 2.2 percent of the weight of the magnesium sulfate, oxalic acid accounting for 0.5 percent of the weight of the magnesium sulfate, water glass accounting for 2 percent of the weight of the magnesium sulfate, and solid phosphoric acid accounting for 0.8 percent of the weight of the magnesium sulfate on the basis of the step (1);

step (3) adding silicon powder accounting for 3 percent of the weight of the magnesium oxide, 5 percent of fly ash and 1 percent of sodium tripolyphosphate on the basis of the step (2);

adding and uniformly mixing the aggregate in the step (4), wherein the weight ratio of the aggregate to the magnesium oxide is 1.2: 1.

example 2

A high strength magnesium oxysulfate cement similar to example 1, except that the modifier added in step (2) comprises 2% citric acid, 0.4% oxalic acid, 1.5% water glass, 0.6% solid phosphoric acid, based on the weight of magnesium sulfate.

Example 3

A high strength magnesium oxysulfate cement similar to example 1, except that the modifier added in step (2) comprises 2% citric acid, 0.3% oxalic acid, 1% water glass, 0.5% solid phosphoric acid, based on the weight of magnesium sulfate.

Example 4

A high strength magnesium oxysulfate cement similar to example 1, except that the modifier added in step (2) comprises 2.2% citric acid, 0.7% oxalic acid, 2.5% water glass, 0.8% solid phosphoric acid, based on the weight of magnesium sulfate.

Example 5

A high strength magnesium oxysulfate cement similar to example 1, except that the adjuvants added in step (3) include silica powder 3.5%, fly ash 6%, and sodium tripolyphosphate 1.5% by weight of magnesium oxide.

Example 6

A high strength magnesium oxysulfate cement similar to example 1, except that the adjuvants added in step (3) include silica powder 4% by weight of magnesium oxide, fly ash 7% by weight of magnesium oxide, and sodium tripolyphosphate 2% by weight of magnesium oxide.

Example 7

A high strength magnesium oxysulfate cement similar to example 1, except that the adjuvants added in step (3) include silica powder 4.5%, fly ash 8%, and sodium tripolyphosphate 2.5% by weight of magnesium oxide.

Example 8

A high strength magnesium oxysulfate cement similar to example 1, except that the adjuvants added in step (3) include silicon powder 5% by weight of magnesium oxide, fly ash 10% by weight of magnesium oxide, and sodium tripolyphosphate 3% by weight of magnesium oxide.

Example 3

A high strength magnesium oxysulfate cement, similar to example 1, except that the aggregate to magnesium oxide weight ratio added in step (4) is 1.1: 1.

example 9

A high strength magnesium oxysulfate cement, similar to example 1, except that the aggregate to magnesium oxide weight ratio added in step (4) is 1.5: 1.

example 10

A high strength magnesium oxysulfate cement, similar to example 1, except that the aggregate to magnesium oxide weight ratio added in step (4) is 1.7: 1.

example 11

A high strength magnesium oxysulfate cement, similar to example 1, except that the aggregate to magnesium oxide weight ratio added in step (4) is 2: 1.

example 12

A high strength magnesium oxysulfate cement similar to that of example 1, except that MgSO₄The solution has a baume degree of 25 ° baume.

Example 13

A high strength magnesium oxysulfate cement similar to that of example 1, except that MgSO₄The solution had a baume degree of 28 ° baume.

Example 14

A high strength magnesium oxysulfate cement similar to that of example 1, except that MgSO₄The solution had a baume degree of 29 ° baume.

Example 15

A high strength magnesium oxysulfate cement similar to that of example 1, except that MgSO₄The solution had a baume degree of 30 ° baume.

Example 16

A high strength magnesium oxysulfate cement similar to example 1, except that the aggregate is colored sand, the particle size: 3-10 meshes, and the density of the quartz sand is more than or equal to 2.5g/cm²The loss on ignition is less than or equal to 0.7 percent, and the mud content is less than or equal to 1 percent.

Example 17

A high-strength magnesium oxysulfate cement, similar to example 1, except that the quartz sand is divided into a small particle group, a medium particle group and a large particle group, the small particle group has a particle size of 2-3.5mm, the medium particle group has a particle size of 3.5-5mm, the large particle group has a particle size of 5-6mm, and the weight ratio of the small particle group to the medium particle group to the large particle group is 2-5: 1-2: 1-2.

Example 18

A high-strength magnesium oxysulfate cement, similar to example 1, except that the modifier comprises citric acid, solid phosphoric acid, calcium formate, redispersible latex powder, hydroxypropyl methylcellulose and solid phosphoric acid with effective content not less than 98%, and the powdery solid is easily dissolved in water; calcium formate contains 31 percent of calcium and 69 percent of formic acid; the redispersible latex powder has a nonvolatile content of more than or equal to 98 percent and a bulk density: 400-600g/L, ash: 8-12% and pH 5-9; hydroxypropyl methylcellulose, methoxy-containing: 19-24%, hydroxypropoxyl group: 4-12% and pH 4-8 (1% solution).

Example 19

A high-strength magnesium oxysulfate cement is similar to that in example 1, except that for convenience of production and transportation and simplicity in operation, raw materials are mixed in advance and are divided into A, B components to be packaged for later use, and the high-strength magnesium oxysulfate cement can be used only by being mixed in proportion on site, is simple and efficient, saves time, improves the working efficiency and does not influence the performances of the magnesium oxysulfate cement in all aspects.

The preparation method comprises the following steps:

(1) preparing a component A (liquid): handle H₂O and MgSO₄·7H₂Stirring and uniformly mixing O according to the mass ratio of 1:1, adding a modifier, wherein the modifier accounts for MgSO₄·7H₂O3.8 percent, and the specific modifier comprises magnesium sulfate (MgSO)₄·7H₂O) citric acid accounting for 2.2 percent of the weight of the mixture, oxalic acid accounting for 0.5 percent of the weight of the mixture, water glass accounting for 2 percent of the weight of the mixture and solid phosphoric acid accounting for 0.8 percent of the weight of the mixture are stirred, mixed evenly and barreled for standby; it should be noted that, a part of insoluble or crystallized magnesium sulfate in the stirring tank is normal, and the magnesium sulfate can be normally used if the stirring is uniform and the Baume degree measured by a Baume meter is in the range of 29-30.

(2) Preparing a component B (solid): uniformly mixing aggregate quartz sand and magnesium oxide according to a mass ratio of 1.2:1, then adding auxiliary materials, wherein the auxiliary materials account for 9% of the weight of the magnesium oxide, specifically, the auxiliary materials comprise silicon powder accounting for 3% of the weight of the magnesium oxide, 5% of fly ash and 1% of sodium tripolyphosphate, uniformly mixing and packaging for later use;

(3) and (3) mixing the component A prepared in the step (1) and the component B prepared in the step (2), wherein the mass ratio of magnesium oxide in the component A to magnesium oxide in the component B is 0.8.

It should be noted that the quartz sand or the color sand must be dried without moisture and impurities, and if the dryness of the quartz sand or the color sand is not ensured, the quartz sand or the color sand cannot be premixed in advance, and can only be proportionally mixed when in use.

Example 20

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises MgSO₄·7H ₂4% of the mass of O.

Example 21

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises MgSO₄·7H₂4.5% of the mass of O.

Example 22

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises MgSO₄·7H₂5% of the mass of O.

Example 23

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises MgSO₄·7H₂5.5% of the mass of O.

Example 24

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises MgSO₄·7H ₂6 percent of the mass of O.

Example 25

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises MgSO₄·7H₂7% of the mass of O.

Example 26

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises magnesium sulfate (MgSO)₄·7H₂O) 2% by weight of citric acid, 0.4% of oxalic acid, 1.5% of water glass, 0.6% of solid phosphoric acid.

Example 27

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises magnesium sulfate (MgSO)₄·7H₂O) 2% by weight of citric acid, 0.5% of oxalic acid, 2% of water glass, 0.8% of solid phosphoric acid.

Example 28

A high strength magnesium oxysulfate cement similar to example 19, except that in step (1) the modifier comprises magnesium sulfate (MgSO)₄·7H₂O) 2.2% citric acid, 0.7% oxalic acid, 2.5% water glass, 0.8% solid phosphoric acid.

Example 29

A high strength magnesium oxysulfate cement, similar to example 19, except that in step (2), the weight ratio of aggregate to magnesium oxide is 1: 1.

example 30

A high strength magnesium oxysulfate cement, similar to example 19, except that in step (2), the weight ratio of aggregate to magnesium oxide is 1.3: 1.

example 31

A high strength magnesium oxysulfate cement, similar to example 19, except that in step (2), the weight ratio of aggregate to magnesium oxide is 1.5: 1.

example 32

A high strength magnesium oxysulfate cement, similar to example 19, except that in step (2), the aggregate to magnesium oxide weight ratio is 1.7: 1.

example 33

A high strength magnesium oxysulfate cement, similar to example 19, except that in step (2), the weight ratio of aggregate to magnesium oxide is 2: 1.

example 34

A high strength magnesium oxysulfate cement similar to example 19, except that in step (2), the adjuvants include silica powder 3.5 wt%, fly ash 6 wt%, and sodium tripolyphosphate 1.5 wt%.

Example 35

A high strength magnesium oxysulfate cement similar to example 19, except that in step (2), the adjuvants comprise 4% silica powder, 7% fly ash, and 2% sodium tripolyphosphate based on the weight of magnesium oxide.

Example 36

A high strength magnesium oxysulfate cement similar to example 19, except that in step (2), the adjuvants include silica powder 4.5%, fly ash 8%, and sodium tripolyphosphate 2.5% by weight of magnesium oxide.

Example 37

A high strength magnesium oxysulfate cement similar to example 19, except that in step (2), the adjuvants comprise 5% silica powder, 10% fly ash, and 3% sodium tripolyphosphate based on the weight of magnesium oxide.

Example 38

A high-strength magnesium oxysulfate cement, similar to example 19, except that the mass ratio of magnesium oxide in the A component to the B component in said step (3) is 0.7.

Example 39

A high-strength magnesium oxysulfate cement similar to example 19, except that the mass ratio of magnesium oxide in the A component to the B component in step (3) was 0.75.

Example 40

A high-strength magnesium oxysulfate cement similar to example 19, except that the mass ratio of magnesium oxide in the A component to the B component in step (3) was 0.9.

This application has set up multiunit contrast experiment, and some experimentation is as follows:

first, experiment method

1. And (3) clear slurry experiment: optimized MgO/MgSO₄The molar ratio of the solid to the liquid is 1:0.7-0.9 (mass ratio)

Comparative strength of the example (thickness of this ratio is suitable for spraying)

1)MgO:MgSO₄Solution (24 degree Be) ═ 1:0.7-0.9

2)MgO:MgSO₄Solution (25 degree Be) ═ 1:0.7-0.9

3)MgO:MgSO₄Solution (26 degree Be) ═ 1:0.7-0.9

4)MgO:MgSO₄Solution (27 degree Be) ═ 1:0.7-0.9

5)MgO:MgSO₄Solution (28 degree Be) ═ 1:0.7-0.9

6)MgO:MgSO₄Solution (29 degree Be) ═ 1:0.7-0.9

7)MgO:MgSO₄Solution (30 degree Be) ═ 1:0.7-0.9

Through the proportioning experiment, after the product is placed for 3 days, the product is tested according to the GB/T50081-2019 method, and the measured strength is known as follows: MgO MgSO (magnesium sulfate)₄The solution (28-30 DEG Be) has a good compressive strength of 1: 0.7-0.9. When the water quality is constant, magnesium sulfate heptahydrate is gradually added and stirred until dissolved, the Baume degree is measured by a Baume meter, when the Baume degree reaches 30, the amount of magnesium sulfate heptahydrate is almost equal to the water quality, so when H is equal to H₂O:MgSO₄·7H₂When O is 1:1 (mass ratio), the baume degree of the solution is about 30 ° B. When MgSO₄When the solution is adjusted to 30 DEG Be, the highest compressive strength can reach about 40 MPa.

2. The influence of adding different modifiers, different auxiliary materials and aggregates on the magnesium oxysulfate cement is as follows: with MgO: MgSO₄The solution (28 ℃ Be) is 1:0.7-0.9 (mass ratio) for example, (the modifier is added in MgSO₄·7H₂The mass percent of O, the addition of the auxiliary materials and the aggregate accounting for the mass percent of MgO), the results are as follows:

1)MgO:MgSO₄when the solution (28 DEG Be) is 1:0.7-0.9, the finished product is produced, the deformation crack occurs, and the strength is low;

2)MgO:MgSO₄when the solution (28 DEG Be) is 1:0.7-0.9, 0.5% -1% solid phosphoric acid is added to prepare a finished product, slight cracking occurs, initial setting is slow, but the strength is improved;

3)MgO:MgSO₄when the solution (28 DEG Be) is 1:0.7-0.9, 0.3% -0.8% of oxalic acid is added to prepare a finished product, the initial setting time is prolonged, slight cracking occurs, and the strength is low;

4)MgO:MgSO₄when the solution (28 DEG Be) is 1:0.7-0.91-3% of water glass is added to prepare a finished product, so that the water resistance is good and the binding power is enhanced;

5)MgO:MgSO₄when the solution is prepared, the solution (28 degrees Be) is 1:0.7-0.9, 0.8% -1% of citric acid is added to prepare a finished product, the initial setting time is prolonged, but the strength is enhanced, the binding power is enhanced, and the water resistance is better;

6)MgO:MgSO₄when the solution (28 DEG Be) is 1:0.7-0.9, 1% -3% of sodium tripolyphosphate is added to prepare a finished product, the initial setting time is prolonged, the water resistance is good, and the strength is high;

7)MgO:MgSO₄when the solution is prepared, the solution (28 DEG Be) is 1:0.7-0.9, 3% -5% of silicon powder is added to prepare a finished product, the initial setting time is prolonged, the product is not easy to deform, the compressive strength is enhanced, and the water resistance is enhanced;

8)MgO:MgSO₄when the solution is used (28 degrees Be) is 1:0.7-0.9, 5% -10% of fly ash is added to prepare a finished product, the initial setting time is prolonged, the product is not easy to deform, the strength is enhanced, and the binding power is enhanced;

9)MgO:MgSO₄when the solution is prepared, the content of (28 degrees Be) is 1:0.7-0.9, 20-50% of quartz sand is added to prepare a finished product, slight cracking occurs, but the strength is enhanced, and the binding force is reduced;

10)MgO:MgSO₄when the solution (28 DEG Be) is 1:0.7-0.9, 0.3-0.8% of oxalic acid, 0.5-1% of solid phosphoric acid, 1-3% of water glass, 0.8-1% of citric acid and 20-50% of quartz sand are added to prepare a finished product, so that the finished product has the advantages of no crack, high strength, strong cohesive force and good water resistance;

11)MgO:MgSO₄when the solution (28 DEG Be) is 1:0.7-0.9, 0.3-0.8% of oxalic acid, 0.5-1% of solid phosphoric acid, 1-3% of water glass, 0.8-1% of citric acid, 1-3% of sodium tripolyphosphate, 3-5% of silicon powder, 5-10% of fly ash and 20-50% of quartz sand are added to prepare a finished product, so that the finished product has better non-cracking performance, higher strength, strong cohesive force and good water resistance;

12) increase MgSO₄The Baume degree of the solution is repeated by the ratio of 10, i.e. MgO: MgSO₄Adding the solution (29 degree Be) to 1:0.7-0.9 to obtain the final product, wherein the ratio of MgO to MgSO₄The strength of the finished product is 1.3 times higher when the solution (28 DEG Be) is 1: 0.7-0.9;

13) continued increase of MgSO₄Baume of solutionRepeating the proportion of item 10, i.e. MgO: MgSO₄When the solution (30 DEG Be) is 1:0.7-0.9, the finished product is prepared, and the ratio of MgO to MgSO₄When the solution (28 DEG Be) is 1:0.7-0.9, the strength of the finished product is 1.5 times higher;

14) continued increase of MgSO₄The baume degree of the solution is close to that of a saturated solution to prepare a finished product when the baume degree is higher than 30 DEG Be at normal temperature, and the surface of the finished product is crystallized, so that the production is not facilitated.

Through the comparison of the experiments, the mixture of citric acid, oxalic acid, water glass and solid phosphoric acid is the best modifier of magnesium oxysulfate cement, MgSO₄The solution has better performance when the Baume degree is 28-30. When MgSO₄The solution is prepared to a Baume degree of 30 and is the best blending agent for the magnesium oxysulfate cement.

3. With MgO: MgSO₄The solution (30 degree Be) is 1:0.7 (mass ratio) as main material proportion, modifier is added according to different proportion, the modifier includes magnesium sulfate (MgSO)₄·7H₂O) 2 to 2.3 percent of citric acid, 0.3 to 0.8 percent of oxalic acid, 1 to 3 percent of water glass and 0.5 to 1 percent of solid phosphoric acid based on the weight of the raw materials, and the test has the influence on the strength, the water resistance and the binding power of finished products

1) Gradually adding the modifier and magnesium sulfate heptahydrate according to the mass percentage of 3.8-7.1%, and obtaining the finished product with known contrast strength: when the mass percentage of the modifier to the magnesium sulfate heptahydrate is gradually increased from 3.8 percent to 7.1 percent, the compressive strength of the finished product is gradually increased; when the mass percentage of the modifier to the magnesium sulfate heptahydrate is larger than the critical value, the compressive strength is reduced on the contrary and the cost is gradually increased; therefore, when the modifier is 3.8-7.1% of magnesium sulfate heptahydrate by mass, the compression strength of the finished product is higher, and the finished product specifically comprises 2.2% of citric acid, 0.5% of oxalic acid, 2% of water glass and 0.8% of solid phosphoric acid, and the compression strength of the finished product is the highest.

2) Attached: the influence of adding different proportions of modifiers on the strength, the adhesive force and the water resistance of a finished product

4. With MgO: MgSO₄The solution (30 DEG Be) is 1:0.7 (mass ratio), and the modifier comprises magnesium sulfate (MgSO)₄·7H₂O) 2-2.3 percent of citric acid, 0.3-0.8 percent of oxalic acid, 1-3 percent of water glass and 0.5-1 percent of solid phosphoric acid, quartz sand or colored sand is added according to different proportions to compare the influences of the compressive strength, the cohesive force and the water resistance of a finished product

1) The quartz sand (or color sand)/MgO is gradually added into a finished product from 20% to 300% by mass percent, and the experimental contrast strength shows that when the mass percent of the quartz sand (or color sand)/MgO is gradually increased from 20% to 150%, the compressive strength is gradually increased, the water resistance is enhanced, and the binding power is enhanced; when the mass percentage of the quartz sand (or the color sand)/MgO is increased from 150 percent to 300 percent, the compressive strength is reduced, the water resistance is not changed greatly, but the binding power is also reduced, and the doping amount of the quartz sand accounts for 100 to 150 percent of the mass percentage of the magnesium oxide in consideration of the solid-liquid ratio and the limitation of a guniting device. Special cases can also be increased to 200% (gritty feel is extra strong).

2) Attached: the influence of adding quartz sand in different proportions on the strength, the cohesive force and the water resistance of a finished product

Thirdly, experimental conclusion:

1. through a large number of experiments, the final optimized proportion is as follows:

1)MgO:MgSO₄solution (30 degree Bee) ═ 1:0.7-0.8 (mass ratio)

2)H₂O:MgSO₄·7H₂O ═ 1:1 (mass ratio) (MgSO4 solution 28-30 ° B)

3) Modifying agent: 2% -2.3% oxalic acid: 0.3% -0.8% of water glass: 1% -3% solid phosphoric acid: 0.5-1% (more than MgSO)₄·7H₂O mass percent)

4) Quartz sand (or colored sand): 100% -150%, sodium tripolyphosphate: 1% -3%, silicon powder: 3% -5%, fly ash: 5% -10% (the weight percentage of MgO)

2. In order to facilitate production, convenient transportation and simple operation, the raw materials are mixed in advance and are divided into A, B components for packaging and standby application, and the raw materials can be used only by being mixed in proportion when arriving at a site.

1) Component A (liquid) (the following contents all refer to MgSO₄·7H₂Mass percent of O)

Firstly handle H₂O:MgSO₄·7H₂Stirring and uniformly mixing O1: 1 (mass ratio), adding a modifier: 2 to 2.3 percent of citric acid, 0.3 to 0.8 percent of oxalic acid, 1 to 3 percent of water glass and 0.5 to 1 percent of solid phosphoric acid are evenly mixed by a stirrer and are barreled for standby.

Note: part of insoluble substances or crystallized magnesium sulfate in the stirring tank is normal, and the magnesium sulfate can be normally used only by uniformly stirring and measuring the Baume degree in a range of 29-30 by using a Baume meter.

2) Component B (solid) (the following contents all refer to the mass percent of MgO)

Quartz sand (or color sand) and MgO (1-1.5: 1) are mixed firstly, 1-3 percent of sodium tripolyphosphate, 3-5 percent of silicon powder and 5-10 percent of fly ash are added, and then the materials are mixed uniformly by a mixer and bagged for standby.

Note: the quartz sand or the color sand must be dried without moisture and impurities, and if the dryness of the quartz sand or the color sand is not ensured, the quartz sand or the color sand cannot be premixed in advance and can only be proportionally mixed when in use.

3) The proportion of MgO in A and B is prepared

The MgO in A: B is mixed and used according to the mass ratio of 0.7-0.8.

Note: when the adding amount of the quartz sand (or the color sand) is increased, the using amount of the component A can be properly increased, and the MgO in the component A: B can be adjusted to be in a range of 0.7-0.9 (mass ratio).

EXAMPLE 41

An assembled inorganic keel is prepared from the magnesium oxysulfate cement prepared in example 1. The inorganic keel plate comprises at least one inorganic keel vertical plate 1, an inorganic keel reinforcing cover plate 2 is clamped on at least one side of the inorganic keel vertical plate 1, at least one surface of the single inorganic keel cover plate 2 contains a fiber reinforcing layer and/or the inside of the inorganic keel cover plate contains a reinforcing rib layer. Specifically, as shown in fig. 1, including one deck square tube form

inorganic keel riser

1, 2 inorganic keel reinforcing apron 2 centre grippings are in the both sides of 1 thickness direction of square tube form inorganic keel riser, and square tube form inorganic material riser 1 sets up and assembles fixedly through connecting piece 3 with 2 inorganic keel reinforcing apron 2 central lines coincide, and square tube form inorganic keel riser 1 is the hollow tube and inside is equipped with violently indulges supporting component, violently indulges the supporting component and is the backup pad that a plurality of parallels and interval set up. The two ends of the square tube-shaped inorganic keel vertical plate 1 in the width direction are both longer than the inorganic keel reinforcing cover plate 2 and extend to the inside of the assembled partition plate.

According to the further optimized technical scheme of the embodiment, partition panels 4 are arranged on two sides of the assembled partition plate, and the filling material is filled between the partition panels 4 on the two sides. The square tube-shaped inorganic keel vertical plate 1 can be formed by adopting a vacuum high-pressure extrusion mode.

The technical scheme of the further optimization of the embodiment is that the filling material is sound-absorbing cotton and/or heat-insulating cotton.

The further optimized technical scheme of the embodiment is that the square tube-shaped inorganic keel vertical plate 1 is clamped and fixed on two sides of the thickness direction of the two inorganic keel reinforced cover plates 2 in the thickness direction.

The further optimized technical scheme of this embodiment is that a horizontal and vertical support assembly is arranged in the square tube-shaped inorganic keel vertical plate 1, and the horizontal and vertical support assembly comprises a plurality of support plates, as shown in fig. 4.

The further optimized technical scheme of the embodiment is that the plurality of support plates are flat plates or curved plates.

The technical scheme of the further optimization of the embodiment is that the inorganic keel reinforced cover plate 2 is a planar plate with fiber reinforced layers on both sides, namely, grid-shaped fiber reinforcement, so that the shock resistance of the square-tube-shaped inorganic keel vertical plate 1 is improved.

The further optimized technical scheme of the embodiment is that the two surfaces of the inorganic keel reinforced cover plate 2 are compounded with two or more layers of latticed reinforced fibers.

The inorganic keel component of the embodiment has extremely high breaking strength and impact strength, and the formed partition structure is formed, so that the installation joint of the partition surface panel is changed from one splicing seam to two splicing seams, and the possibility of 50% of partition cracks is reduced. The strength is high, the assembly is convenient and flexible, and the assembly can be carried out at will, so that different design and use requirements are met. The bottleneck problem that the bearing capacity of the light partition is weak is solved. The space between the inorganic keels can be adjusted, the adaptation grade of the subdivision of the external load of the partition can be adjusted by the width specification size and the thickness of the panel, and the adaptation grade of the external load of the partition can be adjusted by adjusting the width, the thickness and the layer number of the vertical plate of the inorganic keel of the square tube. For example, the high-load-level partitions such as impact-resistant outer walls, retaining walls and cofferdams are also suitable for partitions with dynamic high loads. The inorganic fossil fragments riser of square tubular and inorganic fossil fragments reinforcing apron is discrete and the combination, can adopt earlier the inorganic fossil fragments riser of square tubular of installation in the installation, and the installation is accomplished the back, installs the mode of inorganic fossil fragments apron again, and the inorganic fossil fragments of effectual solution assembled self weight is great like this, the problem of the installation of being not convenient for. The partition wall is suitable for partition walls with external load of more than 30 KN/square meter.

Example 42

An assembled inorganic keel is similar to that of example 41, except that when the support plates are flat plates, the support plates are fixed in the square tubular inorganic keel vertical plate 1 at intervals and in parallel and fixed along the thickness direction of the square tubular inorganic keel vertical plate 1. Thereby enhancing the bearing and pressure resistance of the square tube-shaped inorganic keel vertical plate 1. When a plurality of backup pads are the plane board, interval and parallel fixation are in inorganic fossil fragments riser 1 of square tube form, and are fixed along inorganic fossil fragments riser 1 thickness direction of square tube form. When the supporting plates are flat plates, the supporting plates can also be arranged in the square tube-shaped inorganic keel vertical plate 1 in a crossed manner. When a plurality of backup pads are the curved plate, the symmetry sets up in inorganic fossil fragments riser 1 of square tube form, and two liang of settings that offset of backup pad.

Specifically, as shown in fig. 4, the supporting plate includes a plurality of vertical straight plates 6 arranged at intervals, a supporting sub-plate a7 and a supporting sub-plate B8, the two sides of the supporting sub-plate a7 and/or the supporting sub-plate B8 are supporting side plates 9 symmetrically arranged, and the supporting side plates 9 are gradually inclined toward the center of the square tubular inorganic keel vertical plate 1 after being fixedly connected at the included angle of the square tubular inorganic keel vertical plate 1 and are fixedly connected through a buffer plate 10. The buffer board 10 protrudes outwards or is recessed inwards to form a plurality of board peaks 11 and board valleys 12, the board peaks 11 and the board valleys 12 in the same buffer board 10 are arranged at intervals, and the board peaks 11 and the board valleys 12 located in the support sub-board a7 and the board peaks 11 and the board valleys 12 located in the support sub-board B8 are staggered and then clamped. The pressure resistance and the bearing capacity of the square tubular inorganic keel vertical plate 1 are increased, the mechanical property of the square tubular inorganic keel vertical plate is guaranteed, and meanwhile, when stress is concentrated, the plate peaks 11 and the plate valleys 12 which are arranged in a vertically staggered mode and gaps between the adjacent plate peaks and the plate valleys can provide tiny buffer stress, so that the stress is prevented from being concentrated or the square tubular inorganic keel vertical plate 1 is prevented from being broken.

Example 43

As shown in fig. 3, the inorganic keel assembly of this application is the assembled inorganic keel structure of "mouth" font, specifically includes two inorganic keel reinforcing apron 2 and two inorganic keel risers 1, and two inorganic keel risers 1 interval and parallel arrangement, two inorganic keel reinforcing apron 2 connect respectively and constitute the assembled inorganic keel structure of "mouth" font in the both sides of 1 width direction of inorganic keel riser.

The plane of one side of at least the outside of two inorganic keel reinforcing cover plates 2 of the assembled inorganic keel in the shape of the Chinese character kou adopts fiber reinforcement, or one side of at least the outside of the two inorganic keel reinforcing cover plates 2 adopts a convex surface, adopts fiber reinforcement, and partition panels are installed on two sides of the convex surface. When the inorganic keel reinforced cover plate 2 is a curved plate in a convex shape, the thickness of the middle plate in the width direction of the inorganic keel reinforced cover plate 2 is greater than that of the side plates on both sides. The width of the middle plate is 1/2-2/3 of the width of the inorganic keel reinforced cover plate 2, so that the compression resistance is further increased, and the fracture is prevented. The middle plate and/or the side plate are/is provided with a plurality of connecting grooves on the outer side, and the connecting holes are arranged in the connecting grooves. The connecting holes are arranged in the connecting grooves in a vertical row, the connecting holes are through holes, and the connecting pieces penetrate through the connecting grooves to be fixed.

The strength of the 'square' -shaped assembled inorganic keel is 2 times that of the 'I' -shaped assembled inorganic keel. Is suitable for the partition with dynamic large load. The composite inorganic keel is used for partition assembly type inorganic keels, and is poured with extrusion forming materials, the material components are simple, the manufacturing method is simple, and the manufactured inorganic keel is light in weight, high in strength and high in compressive strength.

Example 44

As shown in fig. 2, the inorganic keel assembly of the present application is an "i" shaped assembled inorganic keel structure, the specific inorganic keel vertical plate 1 and the inorganic keel reinforcing cover plate 2 can be arranged in an integrated manner or can be arranged in a detachable manner, and the inorganic keel reinforcing cover plate 2 is vertically and integrally connected to two ends of the inorganic keel vertical plate 1 to form an integrated i-shaped structure. The machine keel cover plate 2 is internally provided with a through-length steel bar or a reinforced fiber bundle. The partition panel 4 extends from the inorganic keel component on one side to the other inorganic keel component, and the double faces of the partition panel 4 contain fiber reinforced layers.

The number of the inorganic keel reinforced cover plates 2 is two, and the inorganic keel vertical plate 1 is vertically arranged between the two reinforced cover plates in the width direction to form an I-shaped structure. The inorganic keel vertical plate is a solid plate which is not less than 30-50mm thick and is compounded with a glass fiber reinforced layer on two sides, the breaking strength is greater than 5Map, the compressive strength is less than 10Map, the vertical nail-holding force of the material is not less than 350N when the thickness is 30mm, and the connecting piece is a steam nail. The reinforced cover plate is an inorganic flat plate with the thickness of 15-20mm and double-sided glass fiber reinforced layers, the breaking strength is greater than 7Map, the compressive strength is less than 10Map, and steam nails are used as connecting pieces to connect 1 square tubular inorganic keel vertical plate and 2 reinforced cover plates into an I-shaped assembled inorganic keel.

The full-length steel bars or the reinforcing fiber bundles are arranged inside the two I-shaped inorganic keel cover plates 2, so that the diameter of the steel bars or the reinforcing fiber bundles can be accurately calculated and determined according to the load of the partition or the roof or the floor by establishing a calculation model, and the steel bars or the reinforcing fiber bundles can meet the requirements of different load grade changes. The diameter of the steel bar or the fiber bundle can be accurately calculated and determined according to the load of the partition or the roof or the floor by establishing a calculation model, so that the steel bar or the fiber bundle can meet the requirements of different load grade changes. The material has high strength, strong glass fiber and reinforcing steel bar holding capacity and good bonding performance, and can exert the strength of the composite material to the maximum extent.

The fiber reinforced layers on the two sides of the panel are effectively utilized no matter the partition panel or the assembled inorganic keel, the rigid inorganic material assembled partition is endowed with better toughness, and the partition panel has corresponding breaking strength and impact strength. And the strength can be finely adjusted by the density and the layer number of the same fiber reinforced layer under the same environment, so that different design and use requirements are met. The fiber reinforced layer material can be adjusted through the fiber reinforced layers with different strengths, so that different design and use requirements are met. And fiber reinforced layer panels with different mechanical properties can be selected according to the difference of the stress of the inorganic keel reinforced cover plate and the inorganic keel vertical plate to meet the mechanical property requirements of all parts of the assembled inorganic keel.

The inorganic keel of this application can set up to inorganic keel subassembly of plane assembled and mouth style of calligraphy and I shape. The inorganic keel combined partition adopting the assembled inorganic keel has certain shock resistance, impact resistance and horizontal load resistance, light weight and high strength, is suitable for different partition thicknesses, is convenient to adjust the partition thickness, does not increase the partition weight, can reduce partition constructional columns, reduces construction and installation cost and improves efficiency, the assembled partition assembled by the inorganic keel can not generate through seams, the interior of the partition can be used as a pipeline channel to meet the requirement of 'pipeline separation' of the assembled building partition, can be filled with heat-insulating and sound-insulating materials under the condition of high partition sound insulation and heat insulation requirements, can reduce the space between the inorganic keels when being used as a partition of a roof or a floor, adjust the diameter of reinforcing steel bars or fiber bundles in the reinforcing cover plate of the inorganic keel, reduce construction cost and labor intensity of construction workers, based on the original production and installation experience of nearly 20 years, the invention obtains a new process and a method suitable for various building partitions by repeatedly carrying out a great deal of engineering practice and laboratory research and development innovations, and the whole process and result can be clearly seen from the process of the invention document.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. The high-strength magnesium oxysulfate cement is characterized in that the used raw materials comprise magnesium oxide, magnesium sulfate, auxiliary materials, a modifier and an aggregate, and the weight ratio of the magnesium oxide to the magnesium sulfate is 1:0.7-0.9 percent of modifier, 3.8-7.1 percent of magnesium sulfate, 9-18 percent of auxiliary material, 1-2 percent of aggregate and magnesium oxide: 1.

2. the high strength magnesium oxysulfate cement of claim 1, wherein the MgSO₄The baume degree of the solution is 25-32 Be.

3. The high strength magnesium oxysulfate cement of claim 1, wherein the modifier is one or more of citric acid, solid phosphoric acid, calcium formate, redispersible latex powder, water glass, oxalic acid, hydroxypropyl methylcellulose.

4. The high strength magnesium oxysulfate cement of claim 3, wherein the modifier comprises magnesium sulfate (MgSO)₄·7H₂O) 2 to 2.3 percent of citric acid, 0.3 to 0.8 percent of oxalic acid, 1 to 3 percent of water glass and 0.5 to 1 percent of solid phosphoric acid. .

5. The high strength magnesium oxysulfate cement of claim 1, wherein the aggregate is quartz sand and/or colored sand.

6. The high-strength magnesium oxysulfate cement according to claim 1, wherein the auxiliary materials comprise 3-5% of silicon powder, 5-10% of fly ash and 1-3% of sodium tripolyphosphate based on the weight of magnesium oxide.

7. A preparation process of high-strength magnesium oxysulfate cement is characterized by comprising the following steps:

(2) adding a modifier based on the step (1), wherein the modifier accounts for 3.8-7.1% of the magnesium sulfate;

(3) adding aggregate, wherein the weight ratio of the aggregate to the magnesium oxide is 1-2: 1.

8. a preparation process of high-strength magnesium oxysulfate cement is characterized by comprising the following steps:

(2) preparing a component B: uniformly mixing the aggregate and magnesium oxide according to the mass ratio of 1-2:1, and packaging for later use;

(3) mixing the component A and the component B prepared in the step (1), wherein the mass ratio of magnesium oxide in the component A to magnesium oxide in the component B is 0.7-0.9.

9. Use of a high strength magnesium oxysulfate cement according to any one of claims 1 to 7 in the field of construction.

10. An assembled inorganic keel made of high-strength magnesium oxysulfate cement according to any one of claims 1-7, comprising at least one inorganic keel vertical plate, an inorganic keel reinforcing cover plate clamped on at least one side of the inorganic keel vertical plate, at least one surface of the single inorganic keel cover plate containing a fiber reinforcing layer and/or a reinforcing rib layer inside the inorganic keel cover plate.