Polymer cement waterproof slurry with high thermal insulation performance and preparation method thereof

Abstract

The invention provides polymer cement waterproof slurry with high thermal insulation performance and a preparation method thereof, and relates to the technical field of waterproof paints.The polymer cement waterproof slurry comprises a component A and a component B. The component A is a liquid material and comprises, by weight, 65% of acrylic high-molecular polymer emulsion, 30% of deionized water, 3% of dispersing agent, 1% of bactericide and 1% of defoaming agent; the component B is powder and comprises the following components in percentage by weight: 40% of cement, 40% of phase change energy storage microcapsules and 20% of ground calcium carbonate powder; the mass mixing ratio of the component A to the component B is 1: 3, and the problem that traditional K11 polymer cement waterproof slurry lacks heat preservation and energy saving performance can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof coatings, and specifically relates to a polymer cement waterproof slurry with high heat preservation performance and a preparation method thereof. Background Art

[0002] With the improvement of building energy efficiency standards (for example, GB 55015-2021 requires that the heat transfer coefficient of exterior walls in severe cold regions ≤ 0.35 W / (m²·K)), according to the Type I regulations in "JCT 2090-2011 Polymer Cement Waterproof Slurry", the compressive strength is 12 mPa and the flexural strength is 4.0 mPa. K11 polymer cement waterproof slurry is one of the few rigid waterproof materials in the category of polymer cement-based waterproof materials. Compared with other flexible materials, the cured film of rigid K11 is hard, the tiles are more firmly adhered, not easily fallen off, and at the same time has high compressive and impermeability capabilities. However, traditional K11 polymer cement waterproof slurry lacks heat preservation and energy-saving performance.

[0003] The research on thermal insulation particles in the industry has been continuously progressing and has become a research hotspot in the fields of materials science and energy in recent years. The previous thermal insulation particles were mainly perlite particles, volcanic rock particles, etc., but their heat preservation ability was slightly inferior; subsequently, expanded glass beads and polystyrene particles were promoted on the market. Expanded glass beads are hollow glass beads with extremely low water absorption, and it has always been difficult to solve the interfacial problem with the base material. Polystyrene particles have gradually withdrawn from the market because they are light in weight and difficult to be evenly mixed with the base material.

[0004] Microcapsule technology uses microcapsules to encapsulate phase change energy storage materials, blends the phase change energy storage materials with materials such as polyurethane, calcium carbonate, acrylate, and epoxy resin, and uses them as the skeleton, and uses materials such as polyurethane, polystyrene resin, polymethyl methacrylate, and polybenzoic alcohol ester for coating and shell making. This kind of process shows great application potential in fields such as textiles, electronic devices, and solar photovoltaic systems, but due to its high cost, it is difficult to be widely used in the field of building materials.

[0005] Therefore, this application proposes a polymer cement waterproof slurry with heat preservation and energy-saving performance that is low-cost and can be widely used in the field of building materials. Summary of the Invention

[0006] In order to overcome the problems in the background art, the present invention has developed a polymer cement waterproof slurry with high heat preservation performance and a preparation method thereof, solving the problem that traditional K11 polymer cement waterproof slurry lacks heat preservation and energy-saving performance.

[0007] To achieve the above object, the present invention is realized by the following technical solutions: A polymer cement waterproof slurry with high heat preservation performance, comprising component A and component B. Component A is a liquid material, containing the following components in weight percentage: 65% acrylic polymer emulsion, 30% deionized water, 3% dispersant, 1% bactericide, 1% defoamer; Component B is a powder material, containing the following components in weight percentage: 40% cement, 40% phase change energy storage microcapsules, 20% heavy calcium carbonate powder; The mass mixing ratio of component A to component B is 1:3.

[0008] Further, the pH value of the acrylic polymer emulsion in component A is 8.1, and the viscosity is 942 mPa·s.

[0009] Further, the cement in component B is PO42.5 ordinary Portland cement.

[0010] Further, the mesh number of the phase change energy storage microcapsules in component B is 40 - 60 mesh; the mesh number of the heavy calcium carbonate powder is 400 - 600 mesh.

[0011] A preparation method of a polymer cement waterproof slurry with high heat preservation performance, comprising the following steps: (1) Preparation of component A: a. Weigh the formulated amount of deionized water solution, pour it into a stirrer, stir at a speed of 200 r / min, and slowly add the dispersant and bactericide in sequence while stirring, and stir evenly; b. Add the acrylic polymer emulsion, stir at a speed of 800 r / min, and stir for 15 min; c. Add the defoamer into the stirrer, stir for 15 min and then bottle it for standby.

[0012] (2) Preparation of component B: Add cement, heavy calcium carbonate powder, and phase change energy storage microcapsules in a weight ratio of 4:2:3 - 5 into a powder mixer in sequence, disperse and mix at medium speed for 15 min and then set aside; (3) Mixing preparation: a. Weigh a certain weight of component A and pour it into a mixing stirrer; b. Weigh a certain weight of component B according to the mixing ratio, slowly pour component B into component A, and stir while pouring at a speed of 500 r / min; c. After stirring for 10 - 15 min, reduce the stirring speed to 200 r / min, stir for 5 - 10 min, and when there are no obvious visible bubbles in the coating, the mixing preparation is completed.

[0013] A preparation method of phase change energy storage microcapsules, applied to the polymer cement waterproof slurry described in claim 1, comprising the following steps: S1. Screen perlite sand grains with a mesh number of 40 - 60, and conduct absolute drying at 105 °C for 4 h; S2. Use a pressure cooker with both pressurization and negative pressure functions and a heating function. Add PEG and heat it to 60°C to melt it into a liquid with good fluidity. S3. Adopt the positive and negative pressure alternate impregnation method. Pour an appropriate amount of absolutely dry perlite sand grains into the pressure cooker, ensuring that the PEG liquid level is 2 cm higher than the sand grains. First, evacuate and impregnate for 4 h, relieve the pressure and keep the impregnation under normal pressure for 2 h, then pressurize to 0.8 MPa and impregnate for 4 h, relieve the pressure and keep the impregnation under normal pressure for 2 h, and repeat the cycle twice. S4. Operate in a room at a room temperature of 10°C. If there is excess PEG on the surface, recover and save it; freeze and solidify the perlite impregnated with PEG, quickly break it up with a powder machine, and sieve to select sand grains with a mesh size of 50 - 70. S5. Operate in a room at a room temperature of 10°C. Uniformly spray a quick-drying acrylic emulsion on the surface of the sand grains, collect them after they are cured and caked, and the best caking thickness is about 2 mm; after collecting enough, break them up into sand grains and repeat once to ensure that the surface of the sand grains is evenly coated with an acrylic film.

[0014] S6. Collect the uniformly coated phase change energy storage microcapsules and store them after drying.

[0015] Furthermore, the perlite sand grains are highly water-absorbent expanded perlite sand grains with a water absorption rate ≥ 500%.

[0016] Furthermore, the PEG is polyethylene glycol (PEG) with a molecular weight of 400, and the phase change point is 26°C.

[0017] Advantages of the present invention: 1. The high thermal insulation performance polymer cement waterproof slurry prepared in this application has high thermal insulation and high energy-saving performance while having rigid waterproof performance. 2. The main component of the microcapsule shell is a high-polymer acrylic film, which not only has low cost but also has good bonding strength with the interfaces of different building materials, overcoming the problem that traditional microcapsule phase change energy storage materials are difficult to be widely used in the field of building materials.

[0018] 3. The process is simple, the material selection is more economical, and the feasibility is high. Currently, in-situ polymerization, Pickering emulsion polymerization, emulsion polymerization and suspension polymerization, interfacial polymerization and hot air cyclone polymerization are often used for microcapsule preparation. The cost of the core material and shell material selected in this application is much lower than the current mainstream design. Although the microcapsule process in this application is simple, it can meet the coating requirements, has lower production cost and is more suitable for use in the building materials field. Description of the Drawings

[0019] Figure 1 It is a graph of the test data of the compressive strength, flexural strength and thermal conductivity of the present invention. Detailed Embodiments

[0020] In order to make the objectives, technical solutions and beneficial effects of the present invention more clear, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding by technicians.

[0021] 1. Preparation of phase change energy storage microcapsule samples. Prepare samples 1 to 6 according to the configuration of the capsule shell material emulsion, as follows: (1) Screen 40-60 mesh perlite sand and dry it at 105℃ for 4 hours; use a pressure cooker with both pressurization and negative pressure functions and heating functions, add PEG and heat it to 60℃ to melt it into a liquid with good fluidity; use the positive and negative pressure alternating immersion method to pour an appropriate amount of dry perlite sand into the pressure cooker, ensure that the PEG liquid level is 2 cm higher than the sand, first vacuum immerse for 4 hours, release the pressure and keep immersion at normal pressure for 2 hours, then pressurize to 0.8MPa and immerse for 4 hours, release the pressure and keep immersion at normal pressure for 2 hours, and repeat twice; operate in a room with a room temperature of 10℃, if there is excess PEG on the surface, recycle it and store it; freeze and solidify the perlite impregnated with PEG, quickly break it up and crush it with a powder machine, and sieve out 50-70 mesh sand; and take 6 equal portions of sand with numbers 1 to 6 for standby use; (2) Prepare the quick-drying acrylic emulsions used for capsule shell materials No. 1 to No. 6 according to the corresponding proportions. The specific proportions are shown in Table 1. Stir the emulsions No. 1 to No. 6 evenly and pour them into a spray bottle for later use. (3) Spray No. 1 to No. 6 quick-drying acrylic emulsion evenly on the surface of No. 1 to No. 6 sand particles, with a consumption of about 0.06 kg / m2, and collect it after it solidifies and agglomerates; (4) Collect enough solidified samples No. 1 to 6 and break them into sand samples No. 1 to 6, as shown in Table 1. Select the corresponding emulsion and spray the shell material emulsion evenly on the surface of the sand, with a consumption of about 0.06 kg / m2. Collect them after they solidify and agglomerate (if any).

[0022] (5) At this point, the preparation of phase change energy storage microcapsule samples No. 1 to 6 has been completed.

[0023] 2. Test the phase change energy storage microcapsule samples No. 1 to 6 (1) Weigh 200 g of samples 1 to 6 and sieve them to select phase change energy storage microcapsules with a mesh size of 50-70, and record the sieving yield of samples 1 to 6.

[0024] (2) Weigh 5 g of the sieved samples 1 to 6 and place them on filter paper. Place them in a 60°C oven for 1 hour.

[0025] (3) After baking, take out samples 1 to 6 and check whether there is adhesion of phase change energy storage microcapsules in samples 1 to 6 and whether there is oil leakage on the filter paper, and record them.

[0026] Table 1 Comparison Table of Phase Change Energy Storage Microcapsule Sample Parameters Preparation results of phase change energy storage microcapsule samples: There was no oil leakage in two groups, namely No. 2 and No. 4. The processes were spraying twice at a ratio of 1:3 and spraying twice at a ratio of 1:3.5 respectively. Both No. 4 and No. 2 met the requirements. Through comprehensive analysis of the yield (sieving rate) and cost, etc., it was considered that the No. 4 sample was more suitable for preparing polymer cement waterproof slurry with high heat preservation performance.

[0027] Example 1 Preparation of Component A: a. Weigh 30 parts by weight of deionized water solution, pour it into a stirrer, stir at a speed of 200 r / min, and slowly add 3 parts by weight of dispersant and 1 part by weight of bactericide in turn while stirring, and stir evenly; b. Add 65 parts by weight of acrylic polymer emulsion, stir at a speed of 800 r / min for 15 min; c. Add 1 part by weight of defoamer to the stirrer, stir for 15 min and then bottle it for standby.

[0028] (2) Preparation of Component B: Add 40 parts by weight of cement, 20 parts by weight of 400-mesh heavy calcium carbonate powder, and 30 parts by weight of No. 4 sample phase change energy storage microcapsules with 40 meshes to the powder mixer in turn, disperse and mix at medium speed for 15 min and then set aside; (3) Mixing preparation: a. Weigh a certain weight of Component A and pour it into the mixing stirrer; b. Weigh Component B according to the mixing ratio of 1:3, slowly pour Component B into Component A, and stir while pouring at a speed of 500 r / min; c. After stirring for 10 min, reduce the stirring speed to 200 r / min and stir for 5 min. When there are no obvious visible bubbles in the coating, the mixing preparation is completed.

[0029] Example 2 Preparation of Component A: a. Weigh 30 parts by weight of deionized water solution, pour it into a stirrer, stir at a speed of 200 r / min, and slowly add 3 parts by weight of dispersant and 1 part by weight of bactericide in turn while stirring, and stir evenly; b. Add 65 parts by weight of acrylic polymer emulsion, stir at a speed of 800 r / min for 15 min; c. Add 1 part by weight of defoamer to the stirrer, stir for 15 min and then bottle it for standby.

[0030] (2)Preparation of Component B: Add 40 parts by weight of cement, 20 parts by weight of 500-mesh heavy calcium carbonate powder, and 35 parts by weight of 50-mesh No. 4 sample phase change energy storage microcapsules into a powder mixer in sequence. After dispersing and mixing at medium speed for 15 min, set aside; (3)Mixing and preparation: a. Weigh a certain weight of Component A and pour it into a mixing stirrer; b. Weigh Component B according to the mixing ratio of 1:3, slowly pour Component B into Component A, and stir while pouring at a speed of 500 r / min; c. After stirring for 12 min, reduce the stirring speed to 200 r / min and stir for 7 min. When there are no obvious visible bubbles in the coating, the mixing and preparation are completed.

[0031] Example 3 Preparation of Component A: a. Weigh 30 parts by weight of deionized water solution, pour it into a stirrer, stir at a speed of 200 r / min, and slowly add 3 parts by weight of dispersant and 1 part by weight of bactericide in sequence while stirring, and stir evenly; b. Add 65 parts by weight of acrylic polymer emulsion, stir at a speed of 800 r / min for 15 min; c. Add 1 part by weight of defoamer into the stirrer, stir for 15 min and then bottle it for standby.

[0032] (2)Preparation of Component B: Add 40 parts by weight of cement, 20 parts by weight of 600-mesh heavy calcium carbonate powder, and 40 parts by weight of 60-mesh No. 4 sample phase change energy storage microcapsules into a powder mixer in sequence. After dispersing and mixing at medium speed for 15 min, set aside; (3)Mixing and preparation: a. Weigh a certain weight of Component A and pour it into a mixing stirrer; b. Weigh Component B according to the mixing ratio of 1:3, slowly pour Component B into Component A, and stir while pouring at a speed of 500 r / min; c. After stirring for 15 min, reduce the stirring speed to 200 r / min and stir for 10 min. When there are no obvious visible bubbles in the coating, the mixing and preparation are completed.

[0033] Example 4 Preparation of Component A: a. Weigh 30 parts by weight of deionized water solution, pour it into a stirrer, stir at a speed of 200 r / min, and slowly add 3 parts by weight of dispersant and 1 part by weight of bactericide in sequence while stirring, and stir evenly; b. Add 65 parts by weight of acrylic polymer emulsion, stir at a speed of 800 r / min for 15 min; c. Add 1 part by weight of defoamer into the stirrer, stir for 15 min and then bottle it for standby.

[0034] (2) Preparation of Component B: Add 40 parts by weight of cement, 20 parts by weight of 400-mesh heavy calcium carbonate powder, and 45 parts by weight of 40-mesh Sample 4 phase change energy storage microcapsules into the powder mixer in sequence, disperse and mix at medium speed for 15 min and then keep for standby; (3) Mixing and preparation: a. Weigh a certain weight of Component A and pour it into the mixing stirrer; b. Weigh Component B according to the mixing ratio of 1:3, slowly pour Component B into Component A, and stir while pouring at a speed of 500 r / min; c. After stirring for 10 min, reduce the stirring speed to 200 r / min, stir for 5 min, and the mixing preparation is completed when there are no obvious visible bubbles in the coating.

[0035] Example 5 Preparation of Component A: a. Weigh 30 parts by weight of deionized aqueous solution, pour it into the stirrer, stir at a speed of 200 r / min, and slowly add 3 parts by weight of dispersant and 1 part by weight of bactericide in sequence while stirring, and stir evenly; b. Add 65 parts by weight of acrylic polymer emulsion, stir at a speed of 800 r / min for 15 min; c. Add 1 part by weight of defoamer into the stirrer, stir for 15 min and then bottle it for standby.

[0036] (2) Preparation of Component B: Add 40 parts by weight of cement, 20 parts by weight of 400-mesh heavy calcium carbonate powder, and 50 parts by weight of 40-mesh Sample 4 phase change energy storage microcapsules into the powder mixer in sequence, disperse and mix at medium speed for 15 min and then keep for standby; (3) Mixing and preparation: a. Weigh a certain weight of Component A and pour it into the mixing stirrer; b. Weigh Component B according to the mixing ratio of 1:3, slowly pour Component B into Component A, and stir while pouring at a speed of 500 r / min; c. After stirring for 10 - 15 min, reduce the stirring speed to 200 r / min, stir for 5 - 10 min, and the mixing preparation is completed when there are no obvious visible bubbles in the coating.

[0037] The preparation processes of Examples 2 - 5 are the same as that of Example 1, the difference is that the parts by weight of Sample 4 phase change energy storage microcapsules are 3.5 parts, 4 parts, 4.5 parts, and 5 parts respectively, as shown in Table 2 specifically: Table 2 Parameter comparison table of Examples 1 - 5 Table 3 Raw material table of Examples 1-5 Test 1 Flexural and compressive strength test The samples prepared in Examples 1-5 were subjected to flexural and compressive strength tests. The test methods are as follows: a. Pour the well-stirred sample evenly into a prism mold of 40 mm×40 mm×160 mm, vibrate it on a vibrating table for 120 s, use a leveling ruler, place it at a 90° angle on one end of the top of the mold, and slowly and evenly scrape off the excess sample along the long axis direction; b. Cover the cover plate, control the distance between the cover plate and the mold at 2 mm, place it horizontally, carry out moisture curing for 24 h and then demold, and carry out moisture curing for 7 d to obtain test specimens; c. When testing the flexural strength, place the specimen on its side on a universal mechanical testing machine, replace the end fixture with a flexural fixture, the distance between the lower support cylinders is 100 mm, the upper cylinder is centered, make the long axis of the prism specimen perpendicular to the support cylinders, and break it at a rate of 50 N / s; d. When testing the compressive strength, switch the end of the mechanical testing machine, place the prism specimen on its side on the pressure plate, record the stress area, and then apply pressure at a rate of 2400 N / s until it is damaged; e. Calculate and statistically analyze the compressive strength and flexural strength respectively. The data are shown in Table 4.

[0038] Test 2 Thermal conductivity measurement The samples prepared in Examples 1-5 were subjected to thermal conductivity measurement. The test methods are as follows: a. Test according to the method in GB / T 10694-2008. Pour the high thermal insulation polymer cement waterproof slurry samples prepared in Examples 1-5 in the center of the coater, level it and cure for 8 h; b. Apply a second coat of paint, level it and cure for 24 h; c. After taking out the paint, cut it into an appropriate thickness and cure it in an oven at 40℃ for 24 h; d. Place the paint in a thermal conductivity measuring instrument in a room at room temperature of 26℃ and humidity of 40%-60% for measurement. The data are shown in Table 4.

[0039] Sort out the detection data of the compressive strength, flexural strength and thermal conductivity of all Test Examples 1-2, as Figure 1 shown: 1. As Figure 1 shown, the square legend is the compressive strength. The compressive strength of Example 1 is 12 Mpa. As a whole, it first increases and then decreases with the addition amount of phase change thermal insulation microcapsules. The highest point is Example 3, with a value of 15.2 Mpa; 2. The circular legend represents the flexural strength. With the change in the addition amount of the phase change thermal insulation microcapsules, the numerical fluctuations are not significant. The fluctuation changes from 5.4 Mpa in Example 1 to 4.6 Mpa in Example 5. 3. The triangular legend represents the thermal conductivity. The lower the data, the weaker the heat conduction ability and the stronger the heat insulation ability. The thermal conductivity curve decreases with the addition of the phase change thermal insulation microcapsules, from 0.078 in Example 1 to 0.048 in Example 5.

[0040] Table 4 Data Sheet of Sample Tests for Examples 1 - 5 Combined with the overall strength of the material, the optimal process and ratio are 400 g of microcapsules for 1 Kg of Component B, and the water - cement ratio is 1:3. The performance of Example 3 is compared with that of ordinary K11 and ordinary polyurethane microcapsule waterproof materials, and the results are shown in Table 5 as follows: Table 5 Data Sheet of Performance Parameters Data Comparative Analysis: As shown in Table 4 and Table 5, all the index parameters meet the requirements of the Type I specified standards in "JCT 2090 - 2011 Polymer Cement Waterproof Slurry". The main changes in the formula data with the addition of the phase change energy storage microcapsules are in three aspects: compressive strength, flexural strength, and thermal conductivity: ① For the compressive strength, as a whole, it first increases and then decreases with the addition amount of the phase change thermal insulation microcapsules. The highest point is in Example 3, with a value of 15.2 Mpa. ② For the flexural strength, with the change in the addition amount of the phase change thermal insulation microcapsules, the numerical fluctuations are not significant. The fluctuation changes from 5.4 Mpa in Example 1 to 4.6 Mpa in Example 5.

[0041] The data of compressive strength and flexural strength indicate that the incorporation of an appropriate amount of phase change energy storage microcapsules can optimize the internal structure of the polymer cement waterproof slurry, improve its density and adhesiveness, and thus enhance the compressive strength. However, excessive incorporation will lead to an increase in the porosity inside the polymer cement waterproof slurry, affecting the overall mechanical strength of the material. This phenomenon shows that the optimal dosage of the phase change energy storage microcapsules in the strength development at the seven - day age should be controlled around Example 3, that is, 400 g of microcapsules in 1 Kg of Component B, and the water - powder ratio is 1:3.

[0042] The continuous decrease in the flexural strength should be due to the decrease in the cement content, which weakens the internal tensile force and strength of the polymer cement waterproof slurry. However, the within - group difference fluctuations are small and still meet the standard requirements.

[0043] ③ Thermal conductivity. The lower the data, the weaker the thermal conductivity and the stronger the heat preservation ability. The thermal conductivity curve decreases with the addition of phase change heat preservation microcapsules, from 0.078 in Example 1 to 0.048 in Example 5.

[0044] The thermal conductivity data shows that there is a negative correlation between the thermal conductivity and the addition amount. After observing the slope, it can be concluded that the influence of the addition amount on the thermal conductivity is gradually weakening. The reason is that the excessive content of microcapsules leads to an increase in the overall internal voids of the material.

[0045] The thermal conductivities of the five groups are all higher than 0.043 of the polystyrene board. Compared with traditional vitrified microbead thermal insulation mortar and polystyrene particle thermal insulation mortar, the phase change energy storage mortar prepared by the microcapsule technology can absorb / release latent heat during the solid-liquid phase change of the phase change material, balance the day-night temperature difference fluctuation, and reduce building energy consumption.

[0046] While the traditional vitrified microbead mortar only relies on static heat insulation and has a low thermal inertia. The thermal conductivity of the traditional vitrified microbead mortar is 0.06 - 0.078 W / (m·K), and that of the expanded polystyrene particle mortar is 0.039 W / (m·K). The phase change energy storage mortar can improve the unit volume heat capacity and reduce the air-conditioning load while maintaining a similar thermal conductivity (such as 0.05 - 0.07 W / (m·K)) through the composite phase change material.

[0047] In summary, the polymer cement waterproof slurry with high heat preservation performance prepared by this technology can endow the traditional polymer cement waterproof slurry with high heat preservation and high energy-saving performances that it does not have through the phase change energy storage microcapsules. At the same time, the preparation cost is lower than that of the polyurethane microcapsule waterproof material, and the economy is better, so it can be widely applied in the construction field.

[0048] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A polymer cement waterproof slurry with high thermal insulation performance, characterized in that: It comprises component A and component B, wherein component A is a liquid material, and comprises the following components in weight percentage: 65% acrylic polymer emulsion, 30% deionized water, 3% dispersant, 1% bactericide, and 1% defoamer; The component B is a powder material, comprising the following components in weight percentage: 40% cement, 40% phase change energy storage microcapsules, and 20% heavy calcium carbonate powder; The mass mixing ratio of component A to component B is 1:

3.

2. The polymer cement waterproof slurry with high thermal insulation performance according to claim 1, characterized in that: The acrylic polymer emulsion in the component A is an environmentally friendly pure acrylic emulsion with a non-volatile matter content of 55%, a pH value of 8.1, and a viscosity of 942 mPa·s.

3. The polymer cement waterproof slurry with high thermal insulation performance according to claim 1, characterized in that: The cement in the B component is PO42.5 ordinary Portland cement.

4. The polymer cement waterproof slurry with high thermal insulation performance according to claim 1, characterized in that: The mesh size of the phase change energy storage microcapsules in the B component is 40-60 meshes; the mesh size of the heavy calcium carbonate powder is 400-600 meshes.

5. A method for preparing a polymer cement waterproof slurry with high thermal insulation performance, characterized in that: The following steps are involved: (1) Preparation of component A: a. Weigh the formula amount of deionized water solution, pour it into the stirrer, stir at 200r / min, slowly add the dispersant and fungicide in sequence while stirring, and stir evenly; b. Add acrylic polymer emulsion and stir at 800r / min for 15min; c. Add the defoamer into the blender, stir for 15 minutes and then bottle for later use; (2) Preparation of component B: Add cement, heavy calcium carbonate powder, and phase change energy storage microcapsules in a weight ratio of 4:2:3-5 into a powder mixer in sequence, and disperse and mix at medium speed for 15 minutes before use; (3) Mixing preparation: a. Weigh a certain weight of component A and pour it into the mixing mixer; b. Weigh a certain weight of component B according to the mixing ratio, slowly pour component B into component A, stirring at a speed of 500r / min; c. After stirring for 10-15 minutes, reduce the stirring speed to 200r / min and stir for 5-10 minutes. The mixing preparation is completed when there are no obvious bubbles in the coating.

6. A method for preparing phase-change energy storage microcapsules, characterized in that: The polymer cement waterproof slurry according to claim 1 comprises the following steps: S1. Screen 40-60 mesh perlite sand and dry it at 105℃ for 4h; S2. Use a pressure cooker with pressurization, negative pressure and heating functions, add PEG and heat it to 60°C to melt it into a liquid with good fluidity; S3. Use the positive and negative pressure alternating immersion method to pour an appropriate amount of absolutely dry perlite sand into the pressure cooker, ensure that the PEG liquid level is 2 cm higher than the sand, first vacuum immerse for 4 hours, release the pressure and keep immersion at normal pressure for 2 hours, then pressurize to 0.8MPa and immerse for 4 hours, release the pressure and keep immersion at normal pressure for 2 hours, and repeat twice; S4. Operate in a room with a room temperature of 10℃. If there is excess PEG on the upper surface, recycle it and store it. Freeze and solidify the perlite impregnated with PEG, quickly break it up with a powder machine, and sieve out 50-70 mesh sand particles. S5. Operate in a room with a room temperature of 10℃, spray acrylic emulsion evenly on the surface of the sand, wait for it to solidify and form lumps, and collect them. The best lumps are about 2mm thick. After collecting enough, break them into sand particles, repeat once, and ensure that the surface of the sand particles is evenly coated with acrylic film. S6. Collect the uniformly coated phase change energy storage microcapsules and store them in a dry manner.

7. The polymer cement waterproof slurry with high thermal insulation performance according to claim 6, characterized in that: The perlite sand particles are expanded perlite sand particles with high water absorption rate, and the water absorption rate is ≥500%.

8. The polymer cement waterproof slurry with high thermal insulation performance according to claim 6, characterized in that: The PEG is polyethylene glycol with a molecular weight of 400 and a phase transition point of 26°C.

Images