CN111470841B - Preparation method of floor heating insulation board - Google Patents
Preparation method of floor heating insulation board Download PDFInfo
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- CN111470841B CN111470841B CN202010281934.2A CN202010281934A CN111470841B CN 111470841 B CN111470841 B CN 111470841B CN 202010281934 A CN202010281934 A CN 202010281934A CN 111470841 B CN111470841 B CN 111470841B
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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
- C04B28/30—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5035—Silica
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B2038/0052—Other operations not otherwise provided for
- B32B2038/0076—Curing, vulcanising, cross-linking
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- 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
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The preparation method of the floor heating insulation board comprises the following steps of taking 100 parts by weight of magnesium oxide, 55-60 parts by weight of magnesium sulfate and 60-65 parts by weight of water as reaction raw materials, adding 0.8-1.6 parts by weight of citric acid monohydrate, 0.5-1 part by weight of sodium citrate and 0.5-2.8 parts by weight of calcium stearate as modification aids, taking 5-10 parts by weight of bentonite, 12-28 parts by weight of fly ash and 18-28 parts by weight of talcum powder as filling materials to prepare colloidal slurry, rolling and forming the colloidal slurry together with low-alkali glass fiber gray fabric, curing, grooving, spraying a heat-conducting coating, and thus obtaining the floor heating insulation board. The floor heating insulation board prepared by the invention is safe and environment-friendly, the formaldehyde emission is as low as 0.1ml/L, and the E0 level is reached; the mechanical strength is high, the deformation resistance is strong, and no warping or concave-convex deformation occurs; the floor heating has excellent physical and chemical properties, excellent impermeability and corrosion resistance, stable performance and prolonged service life of the whole floor heating; the heat dissipation structure has the advantages of excellent heat conduction performance, high heat conduction coefficient, quick heat dissipation and good heat dissipation uniformity.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of a floor heating insulation board.
Background
The floor heating is short for floor radiation heating, the whole floor is used as a radiator, the whole floor is uniformly heated through a heating medium in a floor radiation layer, and the heating purpose is achieved by conducting from bottom to top by utilizing the law of heat storage and upward radiation of the floor. The water floor heating is a heating mode which heats water to a certain temperature, conveys the water to a water pipe heat dissipation network under the floor and realizes the heating purpose by heating the floor. The low-temperature ground heating medium forms a temperature gradient gradually decreasing from the sole to the head in a room, so that the comfort of foot warming and head cooling is provided for people.
The ground heating is a novel heating mode which is started to rise in the northern area of the yellow river in recent years in China, and the application of the ground heating is quite wide in Shandong, Tianjin, northeast, inner Mongolia, Hebei and the like in China. For example, in Tianjin city, floor heating accounts for 40% of new buildings, and is popular among residents. The Chinese government has listed ground heating as a building energy-saving technology which is mainly popularized and applied, has a bright application prospect and has a huge development market.
The floor heating is realized by plastic pipelines or heating cables hidden under the floor, so the quality of heat medium transmission materials and heat insulation materials such as pipelines hidden under the floor is the main reason for influencing the service life of the floor. As floor heating is in the market starting and rising stage, home decoration floor heating materials are mixed with fishes and dragons, the quality of the materials is uneven, the current best paving material of the floor heating floor is a solid wood composite floor, a large amount of adhesive and paint are needed in the production process, and the two materials can release a large amount of formaldehyde. When the floor heating insulation board is used, the mechanical property, the heat resistance and the aging resistance of the floor heating insulation board are all problematic. Most floor heating boards have poor deformation resistance, and the surface of the floor heating board is uneven when being installed, so that the surface floor is also uneven; the heat conduction capability of the floor heating plate is poor, heat supply is not smooth after construction, and heat conduction is not uniform; the floor heating plate can expand and deform after being heated, and the upper floor can deform to a certain extent in long-term use.
Disclosure of Invention
The invention aims to provide a preparation method of a floor heating insulation board with uniform heat transfer and excellent deformation resistance.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a floor heating insulation board is characterized by comprising the following steps: the floor heating insulation board is prepared by taking 100 parts by weight of magnesium oxide, 55-60 parts by weight of magnesium sulfate and 60-65 parts by weight of water as reaction raw materials, 0.8-1.6 parts of citric acid monohydrate, 0.5-1 part of sodium citrate and 0.5-2.8 parts of calcium stearate are added as modification aids, 5-10 parts of bentonite, 12-28 parts of fly ash and 18-28 parts of talcum powder are used as filling materials to prepare colloidal slurry, the slurry is irradiated by Cs-137 for 6-8 hours, placing 2-4 layers of low-alkali glass fiber grey cloth on the lower surface, placing 1 layer of low-alkali glass fiber grey cloth on the upper surface, paving slurry in the middle, rolling for molding, curing, grooving, spraying a heat-conducting coating to prepare the floor heating insulation board, the heat-conducting coating is composed of graphite, acrylic ester and diatomite, and the weight ratio of the graphite to the acrylic ester to the diatomite is 4-7:3-4: 1-2.
Further, the thermal conductive coating is sprayed on one surface of the groove of the floor heating insulation board, and the thickness of the sprayed thermal conductive layer is 0.5-0.8 mm.
Further, the acrylic ester is organosilicon modified acrylic ester, and is prepared by copolymerizing methyl cyclotetrasiloxane, vinyl trimethylsilane and acrylic acid.
The heat-conducting coating has excellent heat stability and strong adhesive force on inorganic materials.
Further, the slurry is prepared by adding magnesium sulfate into water to prepare a solution, then sequentially adding magnesium oxide and calcium stearate, stirring for 15-20min at a stirring speed of 80-100r/min, then adding bentonite, fly ash, talcum powder, citric acid monohydrate and sodium citrate, and stirring to prepare the slurry, wherein the stirring speed is 100-120r/min, and the stirring time is 30-45 min.
The magnesium oxide, magnesium sulfate and water react to form a crystalline phase, and the reaction process is as follows:
5MgO+MgSO4+12H2O＝5Mg(OH)2MgSO4·7H2O；
citric acid monohydrate, sodium citrate and talcum powder synergistically prolong the reaction crystallization and condensation time of magnesium oxide and magnesium sulfate, prevent water from evaporating too fast, and improve the stability and uniformity of a crystallization phase, so that the strength and acid and alkali corrosion resistance of the prepared floor heating insulation board are improved; the calcium stearate is added to improve the water resistance and the water resistance of the board, improve the softening coefficient of the board and reduce the overall deformation of the board after the board is contacted with external water.
When the types of the fillers in the board of the local heating insulation board are various, the heat inside the board is difficult to release, when the external temperature or pressure is gradually increased, the board expands and is easy to crack or even burst after the heat reaches a certain degree, and in addition, the bentonite is easy to absorb water to expand, so that the filling effect and the strength of the board are influenced; the invention adopts bentonite, talcum powder and fly ash as filling materials, wherein the bentonite increases the plasticity and cohesiveness of slurry, improves the adhesive capacity of the surface of the plate, inhibits the phenomena of difficult spraying and uneven coating when a heat-conducting coating is sprayed, the talcum powder promotes the self hydration reaction of the fly ash to generate calcium silicate, increases the waterproofness of the plate, and cooperates with the fly ash and the bentonite to reduce hydration heat, thereby reducing temperature stress, inhibiting the plate from generating cracks or bursting under high temperature and high pressure, simultaneously cooperates with citric acid and sodium citrate to prolong the condensation time of a crystal phase, increases the stability of the plate, the fly ash is uniformly dispersed in the slurry and is combined with the crystal phase, thereby refining capillary pores in the slurry, enhancing the strength of the plate, improving the impermeability and durability of the plate, and inhibiting the water absorption expansibility of the bentonite, the prepared plate has excellent mechanical property and physical and chemical properties. And the Cs-137 irradiation treatment is combined, so that the molecular structure of the slurry is changed, the toughness and tensile strength of the plate are enhanced, and the phenomena of deformation, surface cracking and pulverization of the plate in the grooving process are inhibited.
Furthermore, the particle size of the bentonite is 15-20 μm, and the particle size of the fly ash is 70-80 μm.
The talcum powder is a mixture of talcum powder A with the particle size D of 5.5-6 mu m and talcum powder B with the particle size of 9-10 mu m, wherein the talcum powder A and the talcum powder B have different thicknesses and comprise the following components in percentage by mass: and talcum powder B is 2: 1-1.5.
The talcum powder is a mixture of talcum powder A with the particle size D of 5.5 mu m and talcum powder B with the particle size of 10 mu m, wherein the talcum powder A and the talcum powder B have different thicknesses and comprise the following components in percentage by mass: and talcum powder B is 2:1.
The talcum powder is added into a system as a filling agent to play a skeleton role and is cooperated with citric acid monohydrate and sodium citrate to slow down the crystallization rate, but the talcum powder has a special rhombic flaky structure, so that the density of the plate can be directly influenced, and larger gaps can be formed by the accumulation of particles, so that the density of the plate is reduced, and the corrosion resistance and the deformation resistance of the plate are influenced. According to the invention, the talcum powder with different thicknesses is used as the filling material, so that secondary filling is realized, and the density of the board is increased, thereby reducing the dry shrinkage rate of the prepared board, reducing the hydration heat, preventing high-temperature deformation and ensuring the dimensional stability.
Further, the curing and curing are that the plate after the roll forming is cured for 7 to 12 hours under the conditions of 35 to 45 ℃ and 80 to 90 percent of humidity, the demoulding is carried out, the curing is carried out for 72 hours under the conditions of 30 to 40 ℃ and 65 to 70 percent of humidity, and then the plate enters a cutting production line after being cured for 7 days at normal temperature.
In the preparation process, the prepared plate is easy to have high brittleness, is easy to crack during subsequent cutting and grooving, and has large internal stress and uneven distribution after being sheared and grooved, so that the plate is easy to deform in the use process. The formula and the specific oxidation means improve the toughness of the plate, have good stability, have uniform internal stress distribution and are not easy to deform.
Most specifically, the preparation method of the floor heating insulation board is characterized by comprising the following steps of:
step (1): taking 60-65 parts of water according to the proportion, adding 55-60 parts of magnesium sulfate to mix into magnesium sulfate solution, and sending the magnesium sulfate solution into a stirrer for later use;
step (2): weighing 100 parts of magnesium oxide, 0.8-1.6 parts of citric acid monohydrate, 0.5-1 part of sodium citrate and 0.5-2.8 parts of calcium stearate, sequentially adding into a proportioning bin, conveying into a stirrer, and stirring together with a magnesium sulfate solution for 15-20min at a stirring speed of 80-100 r/min;
and (3): sequentially adding 5-10 parts of bentonite, 12-28 parts of fly ash and 18-28 parts of talcum powder, and stirring for 30-45min at the speed of 120r/min for 100-20 mu m to form colloidal slurry, wherein the particle size of the bentonite is 15-20 mu m, the particle size of the fly ash is 70-80 mu m, the talcum powder is a mixture consisting of talcum powder A with the particle size D of 5.5-6 mu m and talcum powder B with the particle size of 9-10 mu m, and the mass ratio of the talcum powder A: talcum powder B is 2: 1-1.5;
and (4): performing irradiation treatment on the slurry in the step (3) for 6-8h by adopting Cs-137;
and (5): placing 2-4 layers of low-alkali glass fiber gray fabric on the lower surface, placing 1 layer of low-alkali glass fiber gray fabric on the upper surface, paving sizing agent in the middle, rolling and forming, then curing for 7-12 hours at 35-45 ℃ and 80-90% humidity, demoulding, curing for 72 hours at 30-40 ℃ and 65-70% humidity, then curing for 7 days at normal temperature, entering a cutting production line for cutting, and then opening a pipe groove on the upper surface according to the laid pipe diameter;
and (6): spraying a heat-conducting coating with the thickness of 0.5-0.8mm on the grooved surface, wherein the heat-conducting coating is prepared by the following steps of: acrylate ester: diatomaceous earth 4-7:3-4:1-2, preparing.
When the heat-conducting coating is sprayed on the surface of the plate, the surface of the plate has poor adhesion and is difficult to be uniformly and completely sprayed; when the floor heating insulation board works in a high-temperature environment, the heat-conducting coating on the surface of the floor heating insulation board is unstable, and the phenomenon of layering and falling occurs, so that the heat-conducting performance is reduced. According to the invention, the plate is prepared by adopting the formula and the process, and then the heat-conducting coating is sprayed, so that the coating is well attached to the surface of the plate, and when the temperature and the pressure of a working environment are increased, the heat-conducting coating is well tightly attached to the surface of the plate, single-phase heat transfer is realized, the heat transfer is fast, and the heat dissipation is uniform.
The invention has the following technical effects:
the floor heating insulation board prepared by the invention comprises the following components: (1) the formaldehyde emission is as low as 0.1ml/L, reaches E0 grade and is greatly lower than European Union standards, and other radioactive substances are generated; (2) the mechanical strength is high, the breaking strength reaches more than 45MPa, the bearing capacity can reach 13000KN, the deformation resistance is strong, and no warping or concave-convex deformation occurs; (3) the floor heating has excellent physical and chemical properties, excellent impermeability and corrosion resistance, stable size and performance in high-temperature and high-pressure environments, and prolonged service life of the whole floor heating; (4) the heat-conducting plate has excellent heat-conducting property, single-phase heat transfer of the plate, high heat-conducting coefficient which reaches 0.88W/(m.k), quick heat dissipation and good heat dissipation uniformity.
Detailed Description
The present invention is described in detail below by way of examples, it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations of the present invention based on the above-mentioned disclosure.
Example 1
A preparation method of a floor heating insulation board is carried out according to the following scheme:
step (1): taking 62 parts of water according to the proportion, adding 57 parts of magnesium sulfate to mix into magnesium sulfate solution, and sending the magnesium sulfate solution into a stirrer for later use;
step (2): weighing 100 parts of magnesium oxide, 1.2 parts of citric acid monohydrate, 0.6 part of sodium citrate and 2 parts of calcium stearate, sequentially adding into a proportioning bin, conveying into a stirrer, and stirring for 35min together with a magnesium sulfate solution at a stirring speed of 90 r/min;
and (3): sequentially adding 7 parts of bentonite, 20 parts of fly ash and 25 parts of talcum powder, and stirring for 40min at a speed of 110r/min to form colloidal slurry, wherein the particle size of the bentonite is 18 mu m, the particle size of the fly ash is 75 mu m, the talcum powder is a mixture consisting of talcum powder A with the particle size D being 5.5 mu m and talcum powder B with the particle size being 10 mu m, and the mixture consists of the following two kinds of talcum powder with different thicknesses in a mass ratio of: talcum powder B is 2: 1;
and (4): performing irradiation treatment on the slurry in the step (3) for 7 hours by adopting Cs-137;
and (5): placing 3 layers of low-alkali glass fiber gray fabric on the lower surface, placing 1 layer of low-alkali glass fiber gray fabric on the upper surface, laying slurry in the middle, rolling and forming, then curing for 8 hours at 40 ℃ and 85% humidity, demoulding, curing for 72 hours at 35 ℃ and 68% humidity, curing for 7 days at normal temperature, entering a cutting production line for cutting, and then forming a pipe groove on the upper surface according to the laid pipe diameter;
and (6): and (3) spraying a heat-conducting coating with the thickness of 0.6mm on the grooved surface, wherein the heat-conducting coating is prepared by the following steps of: acrylate ester: diatomaceous earth 5: 3.5: 1.5, preparation.
The floor heating insulation board prepared by the method is subjected to performance test, and the chemical properties of the floor heating insulation board are shown in table 1.
Table 1:
the product of the invention is respectively soaked in clear water, saline water, acidic water and alkaline water for 10 days at the temperature of 20 +/-3 ℃, and the product has no obvious deformation, no peeling, pulverization and other phenomena on the surface. As can be seen from the table, the floor heating insulation board prepared by the invention has excellent water resistance and acid and alkali corrosion resistance.
The fireproof grade of the floor heating insulation board prepared by the invention reaches A1 grade, the fire resistance limit can reach 4h, the board does not deform when meeting flame temperature of 1000 ℃, the board lasts for 12h at the temperature of 400 ℃, and the surface heat conduction coating is tightly attached to the board.
The floor heating insulation board prepared by the method is placed in 100 ℃ water to be continuously soaked for 1h, and then is placed in 10 ℃ water to be soaked for 1h, so that after the process is repeated for 20 times, the board is not deformed, the heat conduction coating on the surface is not layered, and no cavitation bubbles exist between the heat conduction coating and the surface of the board.
The heat conductivity coefficient of the floor heating insulation board prepared by the invention reaches 0.88W/(m.k).
Example 2
A preparation method of a floor heating insulation board is carried out according to the following scheme:
step (1): taking 60 parts of water according to the proportion, adding 55 parts of magnesium sulfate to mix into magnesium sulfate solution, and sending the magnesium sulfate solution into a stirrer for later use;
step (2): weighing 100 parts of magnesium oxide, 0.8 part of citric acid monohydrate, 0.5 part of sodium citrate and 0.5 part of calcium stearate, sequentially adding into a proportioning bin, conveying into a stirrer, and stirring together with a magnesium sulfate solution for 30min at a stirring speed of 100 r/min;
and (3): sequentially adding 10 parts of bentonite, 28 parts of fly ash and 18 parts of talcum powder, and stirring for 30min at the speed of 100r/min to form colloidal slurry, wherein the particle size of the bentonite is 20 micrometers, the particle size of the fly ash is 70 micrometers, the talcum powder is a mixture consisting of talcum powder A with the particle size D of 6 micrometers and talcum powder B with the particle size of 9 micrometers, and the mixture consists of the talcum powder A: talcum powder B is 2: 1.5;
and (4): performing irradiation treatment on the slurry in the step (3) for 8 hours by adopting Cs-137;
and (5): placing 2 layers of low-alkali glass fiber gray fabric on the lower surface, placing 1 layer of low-alkali glass fiber gray fabric on the upper surface, laying slurry in the middle, rolling and forming, then curing at 35 ℃ and 90% humidity for 12 hours, demoulding, curing at 30 ℃ and 70% humidity for 72 hours, then curing at normal temperature for 7 days, entering a cutting production line for cutting, and then opening a pipe groove on the upper surface according to the laid pipe diameter;
and (6): and (3) spraying a heat-conducting coating with the thickness of 0.8mm on the grooved surface, wherein the heat-conducting coating is prepared by the following steps of: acrylate ester: diatomaceous earth 4: 4: 2, preparation.
Example 3
A preparation method of a floor heating insulation board is carried out according to the following scheme:
step (1): taking 65 parts of water according to the proportion, adding 60 parts of magnesium sulfate to mix into magnesium sulfate solution, and sending the magnesium sulfate solution into a stirrer for later use;
step (2): weighing 100 parts of magnesium oxide, 1.6 parts of citric acid monohydrate, 1 part of sodium citrate and 2.8 parts of calcium stearate, sequentially adding the materials into a proportioning bin, conveying the materials into a stirrer, and stirring the materials and the magnesium sulfate solution for 45min at a stirring speed of 80 r/min;
and (3): sequentially adding 5 parts of bentonite, 12 parts of fly ash and 28 parts of talcum powder, and stirring for 45min at the speed of 120r/min to form colloidal slurry, wherein the particle size of the bentonite is 15 mu m, the particle size of the fly ash is 80 mu m, the talcum powder is a mixture consisting of talcum powder A with the particle size D being 5.5 mu m and talcum powder B with the particle size being 10 mu m, and the mixture consists of the following two kinds of talcum powder A: talcum powder B is 2: 1-1.2;
and (4): performing irradiation treatment on the slurry in the step (3) for 6-8h by adopting Cs-137;
and (5): placing 4 layers of low-alkali glass fiber gray fabric on the lower surface, placing 1 layer of low-alkali glass fiber gray fabric on the upper surface, laying slurry in the middle, rolling and forming, then curing for 7 hours at 45 ℃ and 80% humidity, demoulding, curing for 72 hours at 40 ℃ and 65% humidity, then curing for 7 days at normal temperature, entering a cutting production line for cutting, and then opening a pipe groove on the upper surface according to the laid pipe diameter;
and (6): and spraying a heat-conducting coating with the thickness of 0.5mm on the grooved surface, wherein the heat-conducting coating is prepared by the following steps of: acrylate ester: diatomaceous earth 7: 3: 1, preparation.
The detection of the physical property and the mechanical property of the floor heating insulation board prepared by the invention is shown in table 2.
Table 2:
the floor heating insulation board prepared by the invention has the advantages that the dry shrinkage rate is 0.1%, the wet expansion rate is 0.1%, the size stability of the board is good, the mechanical strength is high, the bending strength can reach more than 45MPa, and the bearing capacity can reach 13000 KN.
Claims (6)
1. A preparation method of a floor heating insulation board is characterized by comprising the following steps: the floor heating insulation board is prepared by taking 100 parts by weight of magnesium oxide, 55-60 parts by weight of magnesium sulfate and 60-65 parts by weight of water as reaction raw materials, 0.8-1.6 parts of citric acid monohydrate, 0.5-1 part of sodium citrate and 0.5-2.8 parts of calcium stearate are added as modification aids, 5-10 parts of bentonite, 12-28 parts of fly ash and 18-28 parts of talcum powder are used as filling materials to prepare colloidal slurry, the slurry is irradiated by Cs-137 for 6-8 hours, placing 2-4 layers of low-alkali glass fiber grey cloth on the lower surface, placing 1 layer of low-alkali glass fiber grey cloth on the upper surface, paving slurry in the middle, rolling for molding, curing, grooving, spraying a heat-conducting coating to prepare the floor heating insulation board, the heat-conducting coating is composed of graphite, acrylic ester and diatomite, and the weight ratio of the graphite to the acrylic ester to the diatomite is 4-7:3-4:1-2, the talcum powder is a mixture of talcum powder A with the particle size D =5.5-6 μm and talcum powder B with the particle size of 9-10 μm, wherein the talcum powder A and the talcum powder B have different thicknesses and comprise the following components in percentage by mass: talc B =2: 1-1.5.
2. The preparation method of the floor heating insulation board as claimed in claim 1, wherein the method comprises the following steps: the slurry is prepared by adding magnesium sulfate into water to prepare a solution, then sequentially adding magnesium oxide and calcium stearate, stirring for 15-20min at a stirring speed of 80-100r/min, and then adding bentonite, fly ash, talcum powder, citric acid monohydrate and sodium citrate, and stirring to prepare the slurry, wherein the stirring speed is 100-120r/min, and the stirring time is 30-45 min.
3. The preparation method of the floor heating insulation board as claimed in claim 1 or 2, characterized in that: the particle size of the bentonite is 15-20 mu m, and the particle size of the fly ash is 70-80 mu m.
4. The preparation method of the floor heating insulation board as claimed in claim 1 or 2, characterized in that: the curing and curing are that the rolled and formed plate is cured for 7 to 12 hours under the conditions of 35 to 45 ℃ and 80 to 90 percent of humidity, demoulding is carried out, then the plate is cured for 72 hours under the conditions of 30 to 40 ℃ and 65 to 70 percent of humidity, and then the plate enters a cutting production line after being cured for 7 days at normal temperature.
5. The preparation method of the floor heating insulation board as claimed in claim 3, characterized in that: the curing and curing are that the rolled and formed plate is cured for 7 to 12 hours under the conditions of 35 to 45 ℃ and 80 to 90 percent of humidity, demoulding is carried out, then the plate is cured for 72 hours under the conditions of 30 to 40 ℃ and 65 to 70 percent of humidity, and then the plate enters a cutting production line after being cured for 7 days at normal temperature.
6. The preparation method of the floor heating insulation board is characterized by comprising the following steps of:
step (1): taking 60-65 parts of water according to the proportion, adding 55-60 parts of magnesium sulfate to mix into magnesium sulfate solution, and sending the magnesium sulfate solution into a stirrer for later use;
step (2): weighing 100 parts of magnesium oxide, 0.8-1.6 parts of citric acid monohydrate, 0.5-1 part of sodium citrate and 0.5-2.8 parts of calcium stearate, sequentially adding into a proportioning bin, conveying into a stirrer, and stirring together with a magnesium sulfate solution for 15-20min at a stirring speed of 80-100 r/min;
and (3): sequentially adding 5-10 parts of bentonite, 12-28 parts of fly ash and 18-28 parts of talcum powder, and stirring for 30-45min at the speed of 120r/min of 100-: talcum powder B =2: 1-1.5;
and (4): performing irradiation treatment on the slurry for 6-8 hours by adopting Cs-137;
and (5): placing 2-4 layers of low-alkali glass fiber gray fabric on the lower surface, placing 1 layer of low-alkali glass fiber gray fabric on the upper surface, paving sizing agent in the middle, rolling and forming, then curing for 7-12 hours at 35-45 ℃ and 80-90% humidity, demoulding, curing for 72 hours at 30-40 ℃ and 65-70% humidity, then curing for 7 days at normal temperature, entering a cutting production line for cutting, and then opening a pipe groove on the upper surface according to the laid pipe diameter;
and (6): spraying a heat-conducting coating with the thickness of 0.5-0.8mm on the grooved surface, wherein the heat-conducting coating is prepared by the following steps of: acrylate ester: diatomaceous earth =4-7:3-4: 1-2.
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