CN111533506A - Anti-crack waterproof thermal insulation polymer mortar - Google Patents

Abstract

The invention discloses polymer anti-cracking waterproof thermal insulation mortar which comprises the following raw materials in parts by weight: 100-120 parts of silicate cement, 20-30 parts of gypsum, 250 parts of fine sand, 50-100 parts of coarse sand, 5-10 parts of redispersible latex powder, 20-30 parts of modified polyphenyl particles, 10-20 parts of polyacrylate emulsion, 1-3 parts of sodium dodecyl benzene sulfonate, 1-3 parts of starch ether, 1-3 parts of cellulose ether, 10-20 parts of water, 5-8 parts of early strength agent, 5-8 parts of volume stabilizer and 1-3 parts of thixotropic agent. The volume stabilizer is one or a mixture of more than two of ettringite expanding agents, calcium oxide expanding agents or magnesium oxide expanding agents. The anti-cracking waterproof thermal insulation mortar has the advantages of good mortar material cohesiveness, strong stability, good pump-out form retention capacity and cohesiveness through the selection and content adjustment of raw materials, and is suitable for 3D printed buildings, and the printed buildings have good form and volume stability.

Description

Anti-crack waterproof thermal insulation polymer mortar

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to polymer anti-cracking waterproof thermal insulation mortar and a preparation method thereof.

Background

In the field of building energy conservation, the heat-insulating mortar is the key point of building energy conservation. The glue powder polyphenyl granule heat preservation slurry is prepared by taking premixed dry-mixed mortar as a main cementing material, adding proper anti-crack fibers and various additives and taking polystyrene foam granules as light aggregate according to a proportion to form the heat preservation slurry. The material is uniformly stirred on site, and has the advantages of low heat conductivity coefficient, good heat insulation performance, high compressive strength, strong bonding force, strong adhesive force, freeze-thaw resistance, small drying shrinkage rate and small water immersion linear transformation rate, and is not easy to hollowly and crack.

At present, 3D printing technology is gradually improved, and more articles can be printed by 3D. The 3D printing building can subvert the traditional building industry, but the 3D printing building raw material technology in the market is immature at present. The rheological characteristics of the traditional cement material ensure that the state of the cement material cannot be changed, and the self-slump characteristic of the cement material ensures that the cement material cannot have the capability of keeping the shape without external force, so that the traditional cement material has to keep the shape of a member by external force (a mould) and can remove the external force after the final setting of the traditional cement material is finished. In the manufacturing process of the component or the product, the cement material is shaped by the mold, and the mold can be filled with the cement material only by the fluidity or vibration of the cement material in the process of adding the cement material, so that the compact component or the product can be obtained, which brings great inconvenience to production, increases the manufacturing cost and causes excessive waste (waste of the mold). And the conventional cement mortar is not suitable for 3D printing construction at present.

Therefore, the research on the anti-crack mortar for the 3D printing building, which can increase the construction workability of the material, ensure that the material has good heat insulation, anti-crack and waterproof properties and realize continuous printing of the material, has important significance.

Disclosure of Invention

The invention aims to provide the polymer anti-cracking waterproof thermal insulation mortar aiming at the defects in the prior art, the material can realize continuous 3D printing, and has good thermal insulation, anti-cracking and waterproof properties.

In order to achieve the purpose, the invention adopts the following technical scheme:

the polymer anti-cracking waterproof thermal insulation mortar comprises the following raw materials in parts by weight: the material comprises the following raw materials in parts by weight: 100-120 parts of silicate cement, 20-30 parts of gypsum, 250 parts of fine sand, 50-100 parts of coarse sand, 5-10 parts of redispersible latex powder, 20-30 parts of modified polyphenyl particles, 10-20 parts of polyacrylate emulsion, 1-3 parts of sodium dodecyl benzene sulfonate, 1-3 parts of starch ether, 1-3 parts of cellulose ether, 10-20 parts of water, 5-8 parts of early strength agent, 5-8 parts of volume stabilizer and 1-3 parts of thixotropic agent;

the volume stabilizer is selected from one or a mixture of more than two of ettringite expanding agents, calcium oxide expanding agents or magnesium oxide expanding agents;

the preparation method of the modified polyphenyl particles comprises the following steps:

mixing methyltrimethoxysilane, ethanol and water according to a weight ratio of 8:9:1, controlling the temperature not to exceed 50 ℃ to hydrolyze the methyltrimethoxysilane for 1-2h, then adding the polyphenyl particles, adding silica aerogel and carbon fibers, carrying out heat preservation and stirring reaction for 4-6h under the condition of 150-250 ℃, filtering and drying at the drying temperature of 100-120 ℃ for 0.5-1h to obtain modified polyphenyl particles; the polyphenyl particles are: silica aerogel: the carbon fiber is 20-30: 6-8: 5-8: 1.

according to the invention, the modified polyphenyl particles are utilized, the polyphenyl particles are modified by the silica aerogel and the carbon fibers to form carbon fibers connecting the aerogel and the polyphenyl particles, and a compact carbon fiber silica film layer is formed on the surface of the polyphenyl particles, so that the anti-cracking performance of the slurry can be effectively improved, and meanwhile, the heat preservation and waterproof performance is greatly improved. According to the invention, through selection and content adjustment of raw materials, the mortar material has good cohesiveness and strong stability, and has good pump-out form retention capacity and cohesiveness, and the printed building has good form and volume stability. Specifically, in the components of the invention, when the volume stabilizer and the early strength agent are used too little, the hardening speed of the 3D printing material is too slow, the material printed first cannot bear the pressure of the new printing material on the upper layer to deform, which leads to printing failure, and when the volume stabilizer and the early strength agent are used too much, the material is hardened too fast, which affects the bonding strength between the printing layers.

The re-dispersible emulsion powder can be quickly re-dispersed to form emulsion after contacting with water, and has the same property with the initial emulsion, namely, a film can be formed after water is evaporated, and the film has high flexibility, high weather resistance and high adhesion to various base materials. Therefore, the redispersible latex powder can improve the flexibility, deformability, compressive strength, breaking strength, wear resistance, toughness and cohesiveness of the mortar. The starch ether is mainly applied to building mortar, can influence the consistency of the mortar taking cement as a base material, can reduce the vertical flow degree of fresh mortar, and changes the construction property and the sag resistance of the mortar. Starch ethers are usually used in combination with non-modified and modified cellulose ethers, are suitable for both neutral and alkaline systems, and are compatible with most additives in cementitious products. The starch ether and the cellulose ether are jointly acted in the dry building mixture, so that higher thickening property, stronger structural property, sag resistance and easy operability can be endowed.

Preferably, the polymer anti-cracking waterproof thermal insulation mortar is prepared from the following raw materials in parts by weight: 120 parts of Portland cement, 20-30 parts of gypsum, 250 parts of fine sand, 50-100 parts of coarse sand, 8-10 parts of redispersible latex powder, 20-30 parts of modified polyphenyl particles, 15-20 parts of polyacrylate emulsion, 1-3 parts of sodium dodecyl benzene sulfonate, 1-3 parts of starch ether, 1-3 parts of cellulose ether, 10-20 parts of water, 5-8 parts of early strength agent, 5-8 parts of volume stabilizer and 1-3 parts of thixotropic agent. The raw materials are obtained by long-term experimental adjustment, and the prepared polymer anti-cracking waterproof thermal insulation mortar can realize continuous 3D printing and has good thermal insulation, anti-cracking and waterproof properties.

Further preferably, the polymer anti-cracking waterproof thermal insulation mortar is prepared from the following raw materials in parts by weight: 120 parts of Portland cement, 30 parts of gypsum, 200 parts of fine sand, 80 parts of coarse sand, 8 parts of redispersible latex powder, 25 parts of modified polyphenyl particles, 16 parts of polyacrylate emulsion, 2 parts of sodium dodecyl benzene sulfonate, 2 parts of starch ether, 2 parts of cellulose ether, 20 parts of water, 7 parts of an early strength agent, 8 parts of a volume stabilizer and 2 parts of a thixotropic agent. Through a plurality of tests, the inventor finds that the performance of the obtained mortar is optimal under the condition of the content of the components.

In the invention, the volume stabilizer is used for reducing the shrinkage of the hardened material and avoiding cracking. The volume stabilizer is preferably one or a mixture of more than two of ettringite expanding agents, calcium oxide expanding agents or magnesium oxide expanding agents; more preferably an ettringite-based expanding agent.

In the invention, the thixotropic agent is one or more of modified bentonite, montmorillonite or layered silicate minerals of magnesium aluminum silicate. The thixotropic agent is applied to the mortar system, is well mixed with other raw materials and has excellent thixotropy.

Preferably, the redispersible latex powder is an ethylene-vinyl acetate copolymer, and the particle size is 150-200 meshes.

Preferably, the polyacrylate emulsion has a solids content of 35 to 40%, a viscosity of 11.0 to 12.0 Pa.s and a particle size of 160-180 nm.

In the invention, the early strength agent is selected from one or a mixture of more than two of lithium salt early strength agent, chloride salt early strength agent, sodium sulfate, sodium silicate, sodium metasilicate, calcium formate, aluminum sulfate solution and concrete accelerator.

The fine sand is quartz sand or machine-made sand, and the particle size is 70-140 meshes. The coarse sand is quartz sand or machine-made sand, and the particle size is 20-70 meshes.

The invention also provides a preparation method of the polymer anti-cracking waterproof thermal insulation mortar, which comprises the following steps:

according to the raw material ratio, uniformly mixing portland cement, gypsum, fine sand and coarse sand, redispersible latex powder, polyacrylate emulsion, sodium dodecyl benzene sulfonate, starch ether, cellulose ether, water, an early strength agent, a volume stabilizer and a thixotropic agent, adding modified polyphenyl particles, and uniformly stirring to obtain the polymer anti-cracking waterproof thermal insulation mortar.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the modified polyphenyl particles are utilized, and the polyphenyl particles are modified by the silicon dioxide aerogel and the carbon fibers, so that the heat preservation performance and the crack resistance and waterproof performance of the mortar are greatly improved.

2. The volume stabilizer and the early strength agent are optimized, when the volume stabilizer and the early strength agent are used too little, the hardening speed of the 3D printing material is too slow, and the material printed firstly cannot bear the pressure of the upper layer of new printing material to deform, so that printing fails; when the amount is too much, the material is cured too fast, and the bonding strength between printed layers is affected.

3. According to the invention, through selection and content adjustment of raw materials, the mortar material has good cohesiveness and strong stability, and has good pump-out form retention capacity and cohesiveness, and the printed building has good form and volume stability.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the embodiments.

The starting materials used in the following examples are all commercially available.

Wherein the redispersible latex powder is an ethylene-vinyl acetate copolymer, and the particle size is 150-200 meshes. The polyacrylate emulsion has a solid content of 35-40%, a viscosity of 11.0-12.0 Pa.s, and a particle size of 160-180 nm. The fine sand is quartz sand or machine-made sand, and the particle size is 70-140 meshes. The coarse sand is quartz sand or machine-made sand, and the particle size is 20-70 meshes.

Example 1:

preparing modified polyphenyl particles:

mixing 8Kg of methyltrimethoxysilane, 9Kg of ethanol and 1Kg of water, controlling the temperature not to exceed 50 ℃ to hydrolyze the methyltrimethoxysilane for 1-2h, then adding 160Kg of polyphenyl particles, adding 48Kg of silica aerogel and 40Kg of carbon fibers, carrying out heat preservation and stirring reaction for 4-6h under the condition of 150-250 ℃, filtering and drying at 100 ℃, and drying for 1h to obtain the modified polyphenyl particles.

Preparing mortar:

according to the raw material ratio, 100Kg of Portland cement, 20Kg of gypsum, 120Kg of fine sand, 50Kg of coarse sand, 5Kg of redispersible latex powder, 10Kg of polyacrylate emulsion, 1Kg of sodium dodecyl benzene sulfonate, 1Kg of starch ether, 1Kg of cellulose ether, 10Kg of water, 5Kg of calcium formate, 5Kg of ettringite type expanding agent and 1Kg of modified bentonite are mixed uniformly, 20Kg of modified polyphenyl particles are added and stirred uniformly, thus obtaining the polymer anti-cracking waterproof thermal insulation mortar.

Example 2:

preparing modified polyphenyl particles:

mixing 8Kg of methyltrimethoxysilane, 9Kg of ethanol and 1Kg of water, controlling the temperature not to exceed 50 ℃ to hydrolyze the methyltrimethoxysilane for 1-2h, then adding 240Kg of polyphenyl particles, adding 64Kg of silica aerogel and 64Kg of carbon fibers, carrying out heat preservation and stirring reaction for 4-6h under the condition of 150-250 ℃, filtering and drying at 120 ℃, and drying for 0.5h to obtain the modified polyphenyl particles.

Preparing mortar:

according to the raw material ratio, 120Kg of Portland cement, 30Kg of gypsum, 250Kg of fine sand, 100Kg of coarse sand, 10Kg of redispersible latex powder, 20Kg of polyacrylate emulsion, 3Kg of sodium dodecyl benzene sulfonate, 3Kg of starch ether, 3Kg of cellulose ether, 20Kg of water, 8Kg of chloride early strength agent, 8Kg of ettringite type expanding agent and 3Kg of montmorillonite are mixed uniformly, then 30Kg of modified polyphenyl granules are added and stirred uniformly, thus obtaining the polymer anti-cracking waterproof thermal insulation mortar.

Example 3:

preparing modified polyphenyl particles:

mixing 8Kg of methyltrimethoxysilane, 9Kg of ethanol and 1Kg of water, controlling the temperature not to exceed 50 ℃ to hydrolyze the methyltrimethoxysilane for 1-2h, then adding 200Kg of polyphenyl particles, adding 56Kg of silica aerogel and 48Kg of carbon fibers, carrying out heat preservation and stirring reaction for 4-6h under the condition of 150-250 ℃, filtering and drying at the drying temperature of 110 ℃, and drying for 1h to obtain the modified polyphenyl particles.

Preparing mortar:

according to the raw material ratio, 120Kg of Portland cement, 30Kg of gypsum, 200Kg of fine sand, 80Kg of coarse sand, 8Kg of redispersible latex powder, 16Kg of polyacrylate emulsion, 2Kg of sodium dodecyl benzene sulfonate, 2Kg of starch ether, 2Kg of cellulose ether, 20Kg of water, 7Kg of calcium formate, 8Kg of ettringite type expanding agent and 2Kg of layered silicate mineral of magnesium aluminum silicate are mixed uniformly, then 25Kg of modified polyphenyl granules are added and stirred uniformly, thus obtaining the polymer anti-cracking waterproof thermal insulation mortar.

Example 4:

preparing modified polyphenyl particles:

mixing 8Kg of methyltrimethoxysilane, 9Kg of ethanol and 1Kg of water, controlling the temperature not to exceed 50 ℃ to hydrolyze the methyltrimethoxysilane for 1-2h, then adding 200Kg of polyphenyl particles, adding 56Kg of silica aerogel and 56Kg of carbon fibers, carrying out heat preservation and stirring reaction for 4-6h under the condition of 150-250 ℃, filtering and drying at 120 ℃, and drying for 1h to obtain the modified polyphenyl particles.

Preparing mortar:

according to the raw material ratio, 110Kg of Portland cement, 25Kg of gypsum, 180Kg of fine sand, 70Kg of coarse sand, 6Kg of redispersible latex powder, 18Kg of polyacrylate emulsion, 3Kg of sodium dodecyl benzene sulfonate, 2Kg of starch ether, 2Kg of cellulose ether, 15Kg of water, 6Kg of concrete accelerator, 6Kg of ettringite type expanding agent and 2Kg of montmorillonite are mixed uniformly, 28Kg of modified polyphenyl granules are added and stirred uniformly, and the polymer anti-cracking waterproof thermal insulation mortar is obtained.

Comparative example 1:

compared with the example 1, the early strength agent calcium formate is not added in the formula, and other operations are the same as the example 1.

Comparative example 2:

compared with the example 1, the modified polyphenyl particle is replaced by the polyphenyl particle in the formula, and the other operations are the same as the example 1.

Comparative example 3:

the procedure of example 1 was otherwise the same as that of example 1 except that no ettringite-based expanding agent was added to the formulation.

Comparative example 4:

the procedure of example 1 was repeated except that 3Kg of calcium formate and 3Kg of an ettringite-based expanding agent were used in the formulation as compared with example 1.

Comparative example 5:

compared with the embodiment 1, the mortar has the same components, but the content of each component is different from that of the embodiment 1, and the other operations are the same as the embodiment 1. The comparative examples had the following composition contents:

100Kg of Portland cement, 20Kg of gypsum, 120Kg of fine sand, 50Kg of coarse sand, 12Kg of redispersible latex powder, 25Kg of polyacrylate emulsion, 1Kg of sodium dodecyl benzene sulfonate, 1Kg of starch ether, 1Kg of cellulose ether, 10Kg of water, 5Kg of calcium formate, 5Kg of ettringite expanding agent and 1Kg of modified bentonite are mixed uniformly, and then 20Kg of modified polyphenyl granules are added.

Performance testing

The crack-resistant waterproof thermal mortar prepared in examples 1 to 4 was tested for printability, constructability and interlayer adhesion strength.

1. Printability

The anti-cracking waterproof thermal insulation mortar has good printability and can not cause the blockage of a printing nozzle. The working performance is kept for a long time, and the printing operation time can be controlled within 30-150 minutes.

2. Constructability

The anti-cracking waterproof thermal insulation mortar has good constructability. The fresh slurry has good plasticity and strong plastic deformation resistance, and does not bleed or collapse.

3. Interlayer adhesion strength

The interlayer bonding strength of the anti-cracking waterproof thermal insulation mortar is up to 0.2-1.0 MPa, and the structural integrity and the mechanical property of a printed component are ensured.

In conclusion, in the existing 3D printing building material, the anti-cracking waterproof thermal insulation mortar disclosed by the invention has the performance advantages of good printability and constructability, high interlayer bonding strength and the like, and is suitable for 3D printing buildings.

4. Cracking resistance of mortar

The crack resistance of the crack-resistant waterproof thermal insulation mortar prepared in examples 1 to 4 and comparative examples 1 to 5 was tested according to the regulations of JG/T157 putty for exterior walls on the dynamic crack resistance method. The test method is as follows:

the prepared mortar to be tested is coated on an asbestos cement board by a special frame in a scraping way, wherein the size of the prepared mortar to be tested is 200mm multiplied by 150mm multiplied by (4-6) mm, the thickness of a wet film is 2mm, and the surface is ensured to be as flat as one. The drawdown panels were cured for 7 days in a standard environment, and 3 panels were prepared for each sample. And (3) testing the test board on a dynamic anti-cracking tester, and recording the maximum cracking width of the asbestos cement board to be tested to be accurate to 0.02mm before the material layer to be tested cracks. The arithmetic mean value of the test results of the two test plates with larger values is taken as the final result.

The test results are shown in table 2.

2. Tensile compression and shrinkage performances of mortar

The mortars prepared in examples 1 to 4 and comparative examples 1 to 5 were tested for compressive strength, flexural strength and adhesive strength according to the standard GB/T17671 Cement mortar Strength test method, the age of the strength test was 7 days and 28 days, the test pieces were 40mm × 40mm × 160mm, and the adhesive strength was tested according to the standard JC/T907 concrete interface treating agent. The shrinkage performance adopts a method for testing shrinkage in JC/T603 cement mortar dry shrinkage test method.

The test results are shown in table 3.

TABLE 2

TABLE 3

As can be seen from tables 2 and 3, the anti-cracking waterproof thermal insulation mortar disclosed by the invention is good in anti-cracking performance, good in tensile and compressive properties, high in bonding strength and low in shrinkage rate. Compared with the invention, the mortar prepared by the method has obviously reduced performance because the early strength agent calcium formate is not added in the formula, or the polyphenyl granules are adopted to replace the modified polyphenyl granules in the formula, or the ettringite expanding agent is not added in the formula. Compared with the mortar of the invention, the dosage of the calcium formate and the ettringite expanding agent in the formula is reduced or the content of each component in the components is different from that of the mortar of the invention, and the performance of the prepared mortar is obviously lower than that of the mortar of the invention.

In conclusion, the anti-cracking waterproof thermal insulation mortar has the advantages that through the selection of raw materials and the adjustment of the content, the obtained mortar has good anti-cracking performance, good tensile and compressive performance, high bonding strength and low shrinkage rate.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (10)

1. The polymer anti-cracking waterproof thermal insulation mortar is characterized by comprising the following raw materials in parts by weight: 100-120 parts of silicate cement, 20-30 parts of gypsum, 250 parts of fine sand, 50-100 parts of coarse sand, 5-10 parts of redispersible latex powder, 20-30 parts of modified polyphenyl particles, 10-20 parts of polyacrylate emulsion, 1-3 parts of sodium dodecyl benzene sulfonate, 1-3 parts of starch ether, 1-3 parts of cellulose ether, 10-20 parts of water, 5-8 parts of early strength agent, 5-8 parts of volume stabilizer and 1-3 parts of thixotropic agent;

the volume stabilizer is selected from one or a mixture of more than two of ettringite expanding agents, calcium oxide expanding agents or magnesium oxide expanding agents;

the preparation method of the modified polyphenyl particles comprises the following steps:

mixing methyltrimethoxysilane, ethanol and water according to a weight ratio of 8:9:1, controlling the temperature not to exceed 50 ℃ to hydrolyze the methyltrimethoxysilane for 1-2h, then adding the polyphenyl particles, adding silica aerogel and carbon fibers, carrying out heat preservation and stirring reaction for 4-6h under the condition of 150-250 ℃, filtering and drying at the drying temperature of 100-120 ℃ for 0.5-1h to obtain modified polyphenyl particles; the polyphenyl particles are: silica aerogel: the carbon fiber is 20-30: 6-8: 5-8: 1.

2. the polymer anti-cracking waterproof thermal insulation mortar according to claim 1, which is prepared from the following raw materials in parts by weight: 120 parts of Portland cement, 20-30 parts of gypsum, 250 parts of fine sand, 50-100 parts of coarse sand, 8-10 parts of redispersible latex powder, 20-30 parts of modified polyphenyl particles, 15-20 parts of polyacrylate emulsion, 1-3 parts of sodium dodecyl benzene sulfonate, 1-3 parts of starch ether, 1-3 parts of cellulose ether, 10-20 parts of water, 5-8 parts of early strength agent, 5-8 parts of volume stabilizer and 1-3 parts of thixotropic agent.

3. The polymer anti-cracking waterproof thermal insulation mortar according to claim 2, which is prepared from the following raw materials in parts by weight: 120 parts of Portland cement, 30 parts of gypsum, 200 parts of fine sand, 80 parts of coarse sand, 8 parts of redispersible latex powder, 25 parts of modified polyphenyl particles, 16 parts of polyacrylate emulsion, 2 parts of sodium dodecyl benzene sulfonate, 2 parts of starch ether, 2 parts of cellulose ether, 20 parts of water, 7 parts of an early strength agent, 8 parts of a volume stabilizer and 2 parts of a thixotropic agent.

4. The polymer anti-cracking waterproof thermal mortar of claim 1, wherein the volume stabilizer is selected from ettringite swelling agents.

5. The polymer anti-cracking waterproof thermal mortar of claim 1, wherein the thixotropic agent is one or more of modified bentonite, montmorillonite or layered silicate minerals of magnesium aluminum silicate.

6. The polymer anti-cracking waterproof thermal insulation mortar as claimed in claim 1, wherein the redispersible latex powder is ethylene-vinyl acetate copolymer with a particle size of 150-200 mesh.

7. The polymer anti-cracking waterproof thermal insulation mortar as claimed in claim 1, wherein the polyacrylate emulsion has a solid content of 35-40%, a viscosity of 11.0-12.0 Pa-s, and a particle size of 160-180 nm.

8. The polymer anti-cracking waterproof thermal insulation mortar according to claim 1, wherein the early strength agent is one or a mixture of more than two of lithium salt early strength agent, chloride salt early strength agent, sodium sulfate, sodium silicate, sodium metasilicate, calcium formate, aluminum sulfate solution and concrete accelerator.

9. The polymer anti-cracking waterproof thermal insulation mortar according to claim 1, wherein the fine sand is quartz sand or machine-made sand, and the particle size is 70-140 meshes; the coarse sand is quartz sand or machine-made sand, and the particle size is 20-70 meshes.

10. The preparation method of the polymer anti-cracking waterproof thermal insulation mortar in any one of claims 1 to 9, which is characterized by comprising the following steps:

according to the raw material ratio, uniformly mixing portland cement, gypsum, fine sand and coarse sand, redispersible latex powder, polyacrylate emulsion, sodium dodecyl benzene sulfonate, starch ether, cellulose ether, water, an early strength agent, a volume stabilizer and a thixotropic agent, adding modified polyphenyl particles, and uniformly stirring to obtain the polymer anti-cracking waterproof thermal insulation mortar.