CN113831079A - Thermal insulation mortar with good thixotropic property and preparation method thereof - Google Patents
Thermal insulation mortar with good thixotropic property and preparation method thereof Download PDFInfo
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- CN113831079A CN113831079A CN202111112756.1A CN202111112756A CN113831079A CN 113831079 A CN113831079 A CN 113831079A CN 202111112756 A CN202111112756 A CN 202111112756A CN 113831079 A CN113831079 A CN 113831079A
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- double hydroxide
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 61
- 238000009413 insulation Methods 0.000 title claims abstract description 57
- 230000009974 thixotropic effect Effects 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 35
- 239000004793 Polystyrene Substances 0.000 claims abstract description 29
- 229920002223 polystyrene Polymers 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000654 additive Substances 0.000 claims abstract description 15
- 230000000996 additive effect Effects 0.000 claims abstract description 15
- 239000011777 magnesium Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 13
- 239000011398 Portland cement Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 11
- 239000008188 pellet Substances 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 41
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 30
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 24
- 239000006185 dispersion Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 16
- 229920001971 elastomer Polymers 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 14
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 12
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 10
- 239000003469 silicate cement Substances 0.000 claims description 6
- 229920003169 water-soluble polymer Polymers 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- RFRMMZAKBNXNHE-UHFFFAOYSA-N 6-[4,6-dihydroxy-5-(2-hydroxyethoxy)-2-(hydroxymethyl)oxan-3-yl]oxy-2-(hydroxymethyl)-5-(2-hydroxypropoxy)oxane-3,4-diol Chemical compound CC(O)COC1C(O)C(O)C(CO)OC1OC1C(O)C(OCCO)C(O)OC1CO RFRMMZAKBNXNHE-UHFFFAOYSA-N 0.000 claims description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 230000036571 hydration Effects 0.000 claims description 2
- 238000006703 hydration reaction Methods 0.000 claims description 2
- 230000005660 hydrophilic surface Effects 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 26
- 239000004744 fabric Substances 0.000 description 15
- 239000004567 concrete Substances 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000000203 mixture Substances 0.000 description 10
- 239000002135 nanosheet Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 7
- 238000004321 preservation Methods 0.000 description 7
- 239000011083 cement mortar Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000009472 formulation Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012266 salt solution Substances 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920003086 cellulose ether Polymers 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004816 latex Substances 0.000 description 2
- 229920000126 latex Polymers 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000009966 trimming Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
Abstract
The invention discloses thermal insulation mortar with good thixotropic property and a preparation method thereof, wherein the thermal insulation mortar is prepared by mixing 3-6 parts by weight of polystyrene pellets, 82-92 parts by weight of Portland cement, 2-5 parts by weight of an additive and 36 parts by weight of water; or 3-5 parts of polystyrene small balls, 60-75 parts of magnesium cement, 15-25 parts of fly ash, 2-5 parts of an additive and 36 parts of water, wherein the additive is surface-modified layered double hydroxide or surface-modified layered double hydroxide. The heat-insulating mortar prepared by mixing the cement and the polystyrene spheres has good thixotropy, does not deform after being demoulded, has high strength, strong breakage resistance in the transportation process, strong toughness and high crack resistance, and has the advantages of simple preparation process, good repeatability, low cost, environmental protection and good application prospect.
Description
The technical field is as follows:
the invention belongs to the technical field of preparation of inorganic non-metallic materials, and relates to thermal insulation mortar for an assembled fireproof thermal insulation outer wall integrated plate, in particular to thermal insulation mortar which can keep no edge collapse on the upper layer of the integrated plate when a baffle is removed during production of the fireproof thermal insulation outer wall integrated plate.
Background art:
the assembled composite heat-insulating external wall panel is a heat-insulating and structure-integrated composite heat-insulating wall panel which is made by taking an aerated concrete batten or a foamed cement board as a base layer, fixing an organic heat-insulating board on the outer side of the base layer through bonding mortar and anchor bolts, pouring a heat-insulating slurry fireproof protective layer with the thickness of about 3.5cm and pressing alkali-resistant gridding cloth in. In the production process of the product, two problems of 'collapsed edges' and difficulty in pressing mesh cloth into the thermal insulation mortar are easy to occur. The 'edge collapse' is caused by the fact that the heat insulation slurry is poured above the heat insulation plate and then is firstly scraped by the scraper, then the gridding cloth is pressed in, the side face of the heat insulation slurry is not fixed by the baffle after the product leaves the production line, and if the heat insulation slurry has fluidity before solidification, the side face can not be perpendicular to the top face and the bottom face, so that the 'edge collapse' phenomenon is formed. If the fluidity of the thermal insulation slurry is good, the phenomenon of edge collapse is easy to occur before solidification, so that the wall material is difficult to directly assemble in the construction process, even if a process of edge trimming is added, because the aerated concrete strip plate of the base layer cannot be cut, only the redundant part on the side surface can be cut off, and if the phenomenon of edge collapse of the thermal insulation slurry is serious, a fillet is formed at the junction of the top surface and the side surface after edge trimming, so that the quality of the wall body constructed in the later period is difficult to control; if the viscosity of the slurry is relatively high, the grid cloth is difficult to press into the thermal insulation mortar, on one hand, the grid cloth is easy to fall off, and on the other hand, the prepared product cannot form a rough surface, so that the further construction is not favorable; if the stay time on the production line is too long to solve the problem of edge collapse, the product is difficult to generate economic benefit. Therefore, the preparation of the thermal insulation mortar with good thixotropy is an important technology in the production process of the product, the thermal insulation mortar does not collapse after the baffle is removed, and a rough surface can be formed after the gridding cloth is pressed in.
Patent 201810140040.4 discloses a method for producing a fly ash polystyrene thermal insulation mortar, which is prepared from cement, water, fly ash, lime, gypsum, polystyrene foam particles, a water reducing agent, an air entraining agent and vinyl acetate, wherein no technology related to thixotropy of the thermal insulation mortar is involved. In patent 200610025027.1, cellulose ether is added as a thickener, and the mass portion of the cellulose ether is 0.1-2; 1-2.5 parts of ethylene-vinyl acetate copolymer latex powder or acrylic latex powder is doped as a tackifier; these are all organic admixtures, which are costly and have a large amount of admixture.
Layered Double Hydroxides (LDH) are inorganic layered materials with positive charges, and have the characteristics of easily obtained materials and flexible and changeable chemical compositions. The applicant researches and discovers that the LDH can be used for preparing a nano sheet with an ultrathin structure by using a microreactor, and the ultrathin nano sheet and the LDH nano sheet subjected to surface modification by using an organic matter can be highly dispersed in slurry due to the fact that the surfaces of the ultrathin nano sheet and the LDH nano sheet are positively charged, the transverse size of the ultrathin nano sheet is small, and the ultrathin nano sheet and the LDH nano sheet subjected to surface modification by using the organic matter have ultrathin structures, so that the LDH has good thixotropic property. Therefore, the additive is used as an additive to be doped into the thermal insulation mortar to improve the thixotropy of the mortar, and can solve the problem of edge collapse of a thermal insulation mortar layer in the preparation process of the assembled composite thermal insulation external wall panel and the problem that the grid cloth is difficult to press into the internal part of the assembled composite thermal insulation external wall panel due to high viscosity of the thermal insulation mortar.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and aims to design the thermal insulation slurry with good thixotropy, so that the problem of edge collapse after the baffle is removed in the production process of the assembled aerated concrete composite thermal insulation external wall panel is solved.
In order to achieve the purpose, the thermal insulation mortar with good thixotropy is prepared by mixing 3-6 parts of polystyrene pellets, 82-92 parts of Portland cement, 2-5 parts of an additive and 36 parts of water by weight; the additive is surface-modified layered double hydroxide or surface-modified layered double hydroxide. The addition of the additive enables the thermal insulation mortar to have good thixotropic property, and the problem of edge collapse cannot occur before the thermal insulation mortar is hardened.
The invention relates to another thermal insulation mortar with good thixotropy, which is prepared by mixing 3-5 parts of polystyrene spheres, 60-75 parts of magnesium cement, 15-25 parts of fly ash, 2-5 parts of an additive and 36 parts of water, wherein the additive is a surface-modified layered double hydroxide or a surface-modified layered double hydroxide. The addition of the additive enables the thermal insulation mortar to have good thixotropic property, and the problem of edge collapse cannot occur before the thermal insulation mortar is hardened.
The layered double hydroxide is prepared by a preparation method disclosed in CN2012105561499, the morphology of the layered double hydroxide is sheet-shaped, the transverse dimension is 15-100nm, and the thickness of the sheet layer is 0.6-3 nm.
The invention relates to a surface-modified layered double hydroxide, which comprises the following specific preparation processes: dispersing the layered double hydroxide in an aqueous dispersion of a water-soluble polymer, wherein the concentration of the modified LDH in the aqueous dispersion is 10-50mg/L, the concentration of the water-soluble polymer in the aqueous dispersion is 5-30mg/L, and the water-soluble polymer is one of carboxymethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose. The modified LDH surface adsorbs polymer molecules and can also be dispersed in water.
Further, the preparation method of the thermal insulation mortar with good thixotropic property, which is related by the invention, specifically comprises the following steps:
(A1) preparing layered double hydroxide aqueous dispersion or surface-modified layered double hydroxide aqueous dispersion;
(A2) uniformly mixing the aqueous dispersion of the layered double hydroxide obtained in the step (A1) or the aqueous dispersion of the layered double hydroxide with the portland cement to prepare portland cement slurry;
(A3) uniformly mixing the prepared silicate cement slurry with polystyrene spheres to obtain the thermal insulation mortar, wherein the bulk density of the polystyrene spheres is 80-100kg/m3。
Further, rubber powder is added in the step (A2), the content of the rubber powder in the silicate cement slurry is 1.5-3%, the rubber powder has strong adsorption on a hydrophilic surface and can increase the bonding force with other surfaces, and after the cement is hardened, a three-dimensional grid structure is formed in the cement block, so that the tensile strength and the breaking strength of the hardened thermal insulation mortar are increased.
Further, the water cement ratio of the portland cement slurry used in (a2) above is 0.4 to 0.55.
Further, the mass ratio of the polystyrene spheres to the silicate cement slurry in the thermal mortar (A3) is 0.025-0.045.
The invention relates to another preparation method of thermal insulation mortar with good thixotropic property, which comprises the following steps:
(B1) mixing the layered double hydroxide aqueous dispersion or the surface-modified layered double hydroxide with a magnesium sulfate solution;
(B2) mixing the mixed solution of the step (B1) with magnesium oxide to prepare a magnesium cement slurry, the magnesium cement having a main component comprising magnesium oxide and magnesium sulfate;
(B3) uniformly mixing the prepared magnesium cement slurry with polystyrene pellets to obtain the thermal insulation mortar, wherein the bulk density of the polystyrene pellets is 80-100kg/m3。
Further, rubber powder, fly ash and citric acid are added in the step (B2), and the contents of the rubber powder, the fly ash and the citric acid in the magnesium cement slurry are respectively 1.5-3%, 15-25% and 0.2-0.5%. Citric acid can change the product of the reaction of magnesium oxide and magnesium sulfate aqueous solution to generate water-resistant rod-shaped crystals; in addition, citric acid has the effect of delaying hydration, preventing the cement paste from hardening in a short time.
Further, the magnesium sulfate solution and the magnesium oxide mass ratio of the magnesium cement slurry used in the above (B1) and (B2) are 0.7 to 0.9.
Further, the magnesium sulfate solution used in (B2) above was 18 to 23% by mass.
Further, the mass ratio of the polystyrene spheres to the magnesia cement paste in the (B3) thermal mortar is 0.025 to 0.045.
The invention has the following beneficial effects: (1) the heat-insulating mortar prepared by mixing the cement and the polystyrene spheres has good thixotropy and does not deform after being demoulded; (2) the fireproof heat-insulating layer prepared by the method has high strength and strong breakage resistance in the transportation process; (3) the fireproof heat-insulating layer prepared by the method has strong toughness and high crack resistance; (4) the preparation method is simple in preparation process, good in repeatability, low in cost, green and environment-friendly, and has good application prospects.
Description of the drawings:
FIG. 1 is an optical photograph of a sample related to comparative example 1 of the present invention.
Fig. 2 is an optical photograph of a sample related to comparative example 2 of the present invention.
FIG. 3 is an optical photograph of a sample according to example 1 of the present invention.
FIG. 4 is an optical photograph of a sample according to example 2 of the present invention.
Fig. 5A is an optical photograph of a sample according to example 3 of the present invention.
FIG. 5B is an optical photograph of a sample according to example 3 of the present invention.
FIG. 6 is an optical photograph of a sample according to example 3 of the present invention.
The specific implementation mode is as follows:
the invention is further described by way of example with reference to the accompanying drawings.
Comparative example 1:
the specific process steps of the embodiment are as follows:
(1) the bulk density of the polystyrene beads used is from 80 to 100kg/m3The mass is 1.7 g;
(2) uniformly mixing 42g of ordinary portland cement, 1.25g of rubber powder and 18mL of water in proportion to prepare cement slurry;
(3) uniformly mixing the prepared cement slurry with polystyrene spheres to obtain heat-insulating slurry;
(4) pouring the uniformly mixed heat-insulating slurry above a plate compounded by aerated concrete and an organic heat-insulating layer, then leveling, and firmly combining with the organic heat-insulating layer, wherein the height of the heat-insulating mortar layer is 3.5 cm;
(5) covering the surface with gridding cloth, then flattening by using a roller, and firmly combining the gridding cloth with the thermal insulation mortar to obtain the integrated fireproof thermal insulation wallboard;
(6) and after drying, measuring by using a ruler to judge whether the edge collapse phenomenon occurs. After 2 hours, detection shows that the side edge of the prepared heat-insulating mortar layer deforms and cannot be kept flush with the side edges of the aerated concrete substrate and the XPS heat-insulating plate. In order to further characterize that the prepared cement mortar has good shape retention performance, a module of 4cm multiplied by 8cm is prepared according to the formula, the module is disassembled for 30 seconds, then a heavy object of 120g is immediately added at the top end and is quickly taken away, whether the formula is reasonable or not is judged according to the deformation condition of the module, and as shown in figure 1, the module is immediately collapsed and cannot retain the original shape.
Comparative example 2:
the specific process steps of the embodiment are as follows:
(1) the bulk density of the polystyrene beads used is from 80 to 100kg/m3The mass is 1.7 g;
(2) uniformly mixing 30g of magnesium oxide, 12g of fly ash, 0.15g of citric acid, 1.00g of rubber powder and 21mL of a magnesium sulfate aqueous solution with the mass fraction of 22% to prepare cement slurry;
(3) uniformly mixing the prepared cement slurry with polystyrene spheres;
(4) pouring the uniformly mixed heat-insulating slurry above a plate compounded by aerated concrete and an organic heat-insulating layer, then leveling, and firmly combining with the organic heat-insulating layer, wherein the height of the heat-insulating mortar layer is 3.5 cm;
(5) covering the surface with gridding cloth, then flattening by using a roller, and firmly combining the gridding cloth with the thermal insulation mortar to obtain the integrated fireproof thermal insulation wallboard;
(6) and after drying, measuring by using a ruler to judge whether the edge collapse phenomenon occurs. After 2 hours, detection shows that the side edge of the prepared heat-insulating mortar layer deforms and cannot be kept flush with the side edges of the aerated concrete substrate and the XPS heat-insulating plate. In order to further characterize that the prepared cement mortar has good shape retention performance, a module of 4cm multiplied by 8cm is prepared according to the formula, the module is disassembled for 30 seconds, then a weight of 120g is immediately added to the top end and is quickly taken away, whether the formula is reasonable or not is judged according to the deformation condition of the module, and as shown in figure 2, the module is immediately crushed after the weight is applied, and the original shape cannot be retained.
Example 1:
the specific process steps of the embodiment are as follows:
(1) mixing Mg (NO)3)2And Al (NO)3)3Dissolving the mixture in 50ml of deionized water to prepare a mixed salt solution with the total concentration of metal ions of 0.2 mol/l; preparing 50ml of 0.2mol/L sodium hydroxide solution; fully mixing and reacting the mixed salt solution and the sodium hydroxide solution by using a microchannel reactor, and washing the mixture for 1 time by using distilled water to obtain MgAl-LDH; the reaction temperature is 25 ℃; the solid content of the obtained LDH is 7 percent;
(2) 1.4g of the above gel-like MgAl-LDH was uniformly dispersed in 18mL of water;
(3) uniformly mixing 42g of ordinary portland cement, 1.25g of rubber powder and the dispersion liquid in the step (2) to prepare cement slurry;
(4) the prepared cement slurry is uniformly mixed with polystyrene spheres, and the bulk density of the used polystyrene spheres is 80-100kg/m3The mass is 1.7g, and heat preservation slurry is obtained;
(5) pouring the uniformly mixed heat-insulating slurry above a plate compounded by aerated concrete and an organic heat-insulating layer, then leveling, and firmly combining with the organic heat-insulating layer, wherein the height of the heat-insulating mortar layer is 3.5 cm;
(6) covering the surface with gridding cloth, then flattening by using a roller, and firmly combining the gridding cloth with the thermal insulation mortar to obtain the integrated fireproof thermal insulation wallboard;
(7) and after drying, measuring by using a ruler to judge whether the edge collapse phenomenon occurs. After 2 hours, detection shows that the side edge of the prepared heat-preservation mortar layer can be kept flush with the side edges of the aerated concrete substrate and the XPS heat-preservation plate, and deformation does not occur. To further characterize the good shape retention properties of the prepared cement mortar, a 4cm x 8cm module was prepared according to this formulation, the module was removed for 30 seconds, then a 120g weight was immediately added to the top and quickly removed, and the rationality of this formulation was judged by the deformation of the module, as shown in fig. 3, without significant deformation of the module after application of the weight.
Example 2:
this example is the same as example 1 except for the step (2).
The specific process steps of the embodiment are as follows:
(2) 1.4g of the above gel-like MgAl-LDH was uniformly dispersed in 18mL of water, and 10mg/L of an aqueous hydroxypropyl methylcellulose solution was added thereto and stirred for 2 hours.
And after drying, measuring by using a ruler to judge whether the edge collapse phenomenon occurs. After 2 hours, detection shows that the side edge of the prepared heat-preservation mortar layer can be kept flush with the side edges of the aerated concrete substrate and the XPS heat-preservation plate, and deformation does not occur. To further characterize the good shape retention properties of the prepared cement mortar, a 4cm x 8cm module was prepared according to this formulation, the module was removed for 30 seconds, then a 120g weight was immediately added to the top and quickly removed, and the rationality of this formulation was judged by the deformation of the module, as shown in fig. 4, no significant deformation of the module occurred after the application of the weight.
Example 3:
this example is the same as example 1 except for the step (2).
(2) 1.4g of the above gel-like MgAl-LDH was uniformly dispersed in 18mL of water, and 10mg/L of an aqueous solution of carboxymethyl cellulose was added thereto and stirred for 2 hours.
And after drying, measuring by using a ruler to judge whether the edge collapse phenomenon occurs. After 2 hours, detection shows that the side edge of the prepared heat-preservation mortar layer can be kept flush with the side edges of the aerated concrete substrate and the XPS heat-preservation plate, and deformation does not occur through visual observation. In order to further characterize that the prepared cement mortar has good shape retention performance, a module of 4cm multiplied by 8cm is prepared according to the formula, the module is disassembled for 30 seconds, then a heavy object of 120g is immediately added at the top end and is rapidly taken away, and whether the formula is reasonable or not is judged according to the deformation condition of the module. As shown in fig. 5, the module is deformed after the weight is applied, first by leaning sideways (fig. 5A) and then falling down and breaking in two parts from the middle (fig. 5B).
Example 4:
the specific process steps of the embodiment are as follows:
(1) mixing Mg (NO)3)2And Al (NO)3)3Dissolving the mixture in 50ml of deionized water to prepare a mixed salt solution with the total concentration of metal ions of 0.2 mol/l; preparing 50ml of 0.2mol/L sodium hydroxide solution; fully mixing and reacting the mixed salt solution and the sodium hydroxide solution by using a microchannel reactor, and washing the mixture for 1 time by using distilled water to obtain MgAl-LDH; the reaction temperature is 25 ℃; the solid content of the obtained LDH is 7 percent;
(2) uniformly dispersing 1.4g of the gel MgAl-LDH in 21mL of magnesium sulfate aqueous solution with the mass fraction of 22%, and stirring for 2 hours;
(3) uniformly mixing 30g of magnesium oxide, 12g of fly ash, 1.00g of rubber powder and 0.15g of citric acid with the aqueous dispersion in the step (2) to prepare cement slurry;
(3) the prepared cement slurry is uniformly mixed with polystyrene spheres, and the bulk density of the used polystyrene spheres is 80-100kg/m3The mass is 1.7 g;
(4) pouring the uniformly mixed heat-insulating slurry above a plate compounded by aerated concrete and an organic heat-insulating layer, then leveling, and firmly combining with the organic heat-insulating layer, wherein the height of the heat-insulating mortar layer is 3.5 cm;
(5) covering the surface with gridding cloth, then flattening by using a roller, and firmly combining the gridding cloth with the thermal insulation mortar to obtain the integrated fireproof thermal insulation wallboard;
(6) and after drying, measuring by using a ruler to judge whether the edge collapse phenomenon occurs. In order to further characterize that the prepared cement mortar has good shape retention performance, a module of 4cm multiplied by 8cm is prepared according to the formula, the module is disassembled for 30 seconds, then a weight of 120g is immediately added to the top end, and whether the formula is reasonable or not is judged according to the deformation condition of the module.
In this embodiment, after 2 hours, it was found that the side of the prepared thermal mortar layer could be kept flush with the side of the aerated concrete substrate and the XPS thermal insulation board, and no deformation was observed with naked eyes. FIG. 6 is a graph showing the deformation of a 4cm by 8cm module prepared according to the formulation of example 6 immediately after removal of the module for 30 seconds, by adding a weight of 120g to the top and then quickly removing the weight. It was observed in the experiment that the module was deformed immediately after the top was loaded with weight and after the weight was removed quickly, the shape was substantially maintained without the module breaking or collapsing (fig. 6).
Claims (10)
1. The thermal insulation mortar with good thixotropic property is characterized by being prepared by mixing 3-6 parts by weight of polystyrene pellets, 82-92 parts by weight of Portland cement, 2-5 parts by weight of an additive and 36 parts by weight of water; the additive is surface-modified layered double hydroxide or surface-modified layered double hydroxide.
2. The thermal insulation mortar with good thixotropic property is characterized by being prepared by mixing 3-5 parts by weight of polystyrene spheres, 60-75 parts by weight of magnesium cement, 15-25 parts by weight of fly ash, 2-5 parts by weight of an additive and 36 parts by weight of water, wherein the additive is a surface-modified layered double hydroxide or a surface-modified layered double hydroxide.
3. The thermal insulation mortar with good thixotropic property according to claim 1 or 2, wherein the surface-modified layered double hydroxide is prepared by the following specific steps: dispersing the layered double hydroxide in an aqueous dispersion of a water-soluble polymer, wherein the concentration of the modified LDH in the aqueous dispersion is 10-50mg/L, the concentration of the water-soluble polymer in the aqueous dispersion is 5-30mg/L, and the water-soluble polymer is one of carboxymethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose.
4. The preparation method of the thermal insulation mortar with good thixotropic property according to claim 1, which is characterized by comprising the following steps:
(A1) preparing layered double hydroxide aqueous dispersion or surface-modified layered double hydroxide aqueous dispersion;
(A2) uniformly mixing the aqueous dispersion of the layered double hydroxide obtained in the step (A1) or the aqueous dispersion of the layered double hydroxide with the portland cement to prepare portland cement slurry;
(A3) uniformly mixing the prepared silicate cement slurry with polystyrene spheres to obtain the thermal insulation mortar, wherein the bulk density of the polystyrene spheres is 80-100kg/m3。
5. The preparation method of the thermal insulation mortar with good thixotropic property according to claim 4, wherein the step (A2) is further added with rubber powder, the content of the rubber powder in the silicate cement slurry is 1.5-3%, the rubber powder has strong adsorption on a hydrophilic surface, can increase the bonding force with other surfaces, and after cement is hardened, a three-dimensional grid structure is formed inside a cement block, so that the tensile strength and the breaking strength of the thermal insulation mortar after being hardened are increased.
6. The process for producing a thermal mortar having good thixotropic properties according to claim 4, wherein the portland cement slurry used in (a2) has a water-cement ratio of 0.4 to 0.55; the mass ratio of the polystyrene pellets to the silicate cement slurry in the thermal mortar (A3) is 0.025-0.045.
7. The preparation method of the thermal insulation mortar with good thixotropic property according to claim 2, which is characterized by comprising the following steps:
(B1) mixing the layered double hydroxide aqueous dispersion or the surface-modified layered double hydroxide with a magnesium sulfate solution;
(B2) mixing the mixed solution of the step (B1) with magnesium oxide to prepare a magnesium cement slurry, the magnesium cement having a main component comprising magnesium oxide and magnesium sulfate;
(B3) uniformly mixing the prepared magnesium cement slurry with polystyrene pellets to obtain the thermal insulation mortar, wherein the bulk density of the polystyrene pellets is 80-100kg/m3。
8. The preparation method of the thermal insulation mortar with good thixotropic property of claim 7, wherein in the step (B2), rubber powder, fly ash and citric acid are further added, and the contents of the rubber powder, the fly ash and the citric acid in the magnesium cement slurry are respectively 1.5-3%, 15-25% and 0.2-0.5%. Citric acid can change the product of the reaction of magnesium oxide and magnesium sulfate aqueous solution to generate water-resistant rod-shaped crystals; in addition, citric acid has the effect of delaying hydration, preventing the cement paste from hardening in a short time.
9. The method for preparing thermal mortar having good thixotropic properties according to claim 7, wherein the magnesium sulfate solution of the magnesium cement slurry used in (B1) and (B2) is 0.7 to 0.9 in terms of mass ratio to magnesium oxide, and the magnesium sulfate solution used in (B2) is 18 to 23% in terms of mass fraction.
10. The method for preparing thermal mortar having excellent thixotropic properties according to claim 7, wherein the mass ratio of polystyrene beads to magnesia cement paste in the (B3) thermal mortar is 0.025 to 0.045.
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