Anti-sagging thermal-insulation self-cleaning coating for building external wall and preparation method thereof

[0025] Example 1:

[0026] An anti-sagging and thermal insulation self-cleaning paint for building exterior walls, comprising the following parts by weight: 60 parts of silicone-acrylic emulsion, 40 parts of elastic emulsion, 15 parts of polyacrylamide, 6 parts of prefabricated fiber coating material, and sodium humate 4 parts, 4 parts of expanded vermiculite, 10 parts of fillers, 4 parts of additives, 10 parts of water.

[0027] among them:

[0028] The prefabricated fiber coating material includes the following components by mass percentage: polyamide staple fiber 10%, nano silica 30%, nano zinc oxide 4%, hydrogenated polydimethylsiloxane 0.8%, cocoyl monoethanolamine 0.4 %, the balance of polyethylene glycol solution.

[0029] The preparation method of the prefabricated fiber coating material is as follows: add short polyamide fibers to a proper amount of polyethylene glycol solution, heat and stir at 45-50°C for 2 hours, then add cocoyl monoethanolamine to it, continue to stir for 40 minutes, and obtain material 1 for use; Add nano-silica into the remaining polyethylene glycol solution, ultrasonically disperse for 10 minutes, then slowly add material one to it under stirring conditions, and stir at high speed for 20 minutes after the addition is complete to obtain material two for use; add nano zinc oxide and hydrogenated polyethylene glycol The base siloxanes are added sequentially under stirring conditions, and after the addition is completed, the temperature is kept at 40±2°C for 8-10 hours, and then freeze-dried to obtain the prefabricated fiber coating material. Among them: the polyethylene glycol solution is a 3.5% by mass polyethylene glycol 200 aqueous solution, and the polyethylene glycol solution blended with polyamide staple fibers accounts for 40% of the total solution volume; the ultrasonic dispersion frequency is 30KHz, and the temperature It is 32±2℃; the high-speed stirring speed is 600rpm.

[0030] Fillers include brucite powder, light calcium carbonate, ultra-fine talc powder, carbon black 6800, and the mass percentage of each component is 10% brucite powder, 25% ultra-fine talc powder, carbon black 680018%, light weight Calcium carbonate balance.

[0031] Auxiliary agents include cross-linking agent, plasticizer, surfactant, defoaming agent, the weight percentage of the four is 100% cross-linking agent, plasticizer 50%, surfactant 25%, defoaming agent 15 %. Among them: the crosslinking agent is a composition of methyl orthosilicate and ethylene glycol dimethacrylate with a mass ratio of 1:3; the plasticizer is SCT-275, ASE-60, chlorine with a mass ratio of 1:1:2.5 Fossil wax composition; the surfactant is a fatty acid methyl ester ethoxylate sulfonate and fatty acid methyl sulfonate composition with a mass ratio of 1:0.3; the defoamer is a polydimethyl group with a mass ratio of 1:0.5 Silicone, polyoxypropylene oxide ethylene glycerol ether composition.

[0032] Anti-sagging and thermal insulation self-cleaning paint for building exterior walls, the preparation method is as follows:

[0033] 1) Weigh the raw materials in parts by weight, blend the silicone acrylic emulsion, elastic emulsion, and polyacrylamide, and intermittently mix 3 times under the conditions of 30-35°C and 400-500 rpm to obtain component A for use;

[0034] 2) Dissolve sodium humate in water, then add the prefabricated fiber coating to it, first stir at 400-500rpm for 10-15min, then uniformly reduce the speed and stir to 30rpm, keep it for 0.5-1h, and obtain component B for use;

[0035] 3) Divide component B into three equally, and alternately add it with other remaining materials to component A under stirring conditions, and then stir it evenly at 400-500rpm to obtain the final product, anti-sagging, thermal insulation and self-cleaning paint for building exterior walls .

[0036] Among them: the intermittent mixing in step 1) is specifically stirring for 15 minutes, standing for 15 minutes, and this is used as an operation to circulate; in step 2), the uniform speed reduction stirring is specifically reducing 10r every 5 minutes.

[0037] Example 2:

[0038] An anti-sagging and thermal insulation self-cleaning paint for building exterior walls, comprising the following parts by weight: 80 parts of silicone acrylic emulsion, 50 parts of elastic emulsion, 20 parts of polyacrylamide, 10 parts of prefabricated fiber coating material, and sodium humate 6 parts, 5 parts of expanded vermiculite, 15 parts of fillers, 4 parts of additives, 20 parts of water.

[0039] among them:

[0040] The prefabricated fiber coating material includes the following components by mass percentage: 15% short polyamide fiber, 25% nano-silica, 2% nano-zinc oxide, 1.2% hydrogenated polydimethylsiloxane, and 0.8% cocoyl monoethanolamine %, the balance of polyethylene glycol solution.

[0041] The preparation method of the prefabricated fiber coating is as follows: add short polyamide fiber to a proper amount of polyethylene glycol solution, heat and stir at 45-50°C for 1.5 hours, then add cocoyl monoethanolamine to it, continue to stir for 60 minutes, and obtain material 1 for use ; Add nano silicon oxide to the remaining polyethylene glycol solution, ultrasonically disperse for 15 minutes, then slowly add material one under stirring conditions, stir at high speed for 30 minutes after the addition is complete, get material two for use; combine nano zinc oxide and hydrogenated poly two The methyl siloxane is added in sequence under stirring conditions, and after the addition is completed, it is kept at 40±2°C for 8-10 hours, and freeze-dried to obtain the prefabricated fiber coating material. Among them: the polyethylene glycol solution is a 3.5% by mass polyethylene glycol 200 aqueous solution, and the polyethylene glycol solution blended with polyamide staple fibers accounts for 20% of the total solution volume; the ultrasonic dispersion frequency is 30KHz, and the temperature It is 32±2℃; the high-speed stirring speed is 600rpm.

[0042] Fillers include brucite powder, light calcium carbonate, ultra-fine talc powder, carbon black 6800, and the mass percentage of each component is brucite powder 5%, ultra-fine talc powder 25%, carbon black 680020%, light weight Calcium carbonate balance.

[0043] Auxiliary agents include cross-linking agent, plasticizer, surfactant, defoaming agent, the weight percentages of the four are 20% cross-linking agent, 60% plasticizer, 15% surfactant, and anti-foaming agent 5. %. Among them: the crosslinking agent is a composition of methyl orthosilicate and ethylene glycol dimethacrylate with a mass ratio of 1:3; the plasticizer is SCT-275, ASE-60, chlorine with a mass ratio of 1:1:2.5 Fossil wax composition; the surfactant is a fatty acid methyl ester ethoxylate sulfonate and fatty acid methyl sulfonate composition with a mass ratio of 1:0.3; the defoamer is a polydimethyl group with a mass ratio of 1:0.5 Silicone, polyoxypropylene oxide ethylene glycerol ether composition.

[0044] The anti-sagging and thermal insulation self-cleaning paint for building exterior walls, the preparation method is the same as that of Example 1, wherein: the intermittent mixing in step 1) is specifically stirring for 15 minutes, standing for 15 minutes, and this is an operation for looping, looping 3 times ; Step 2) The uniform slow-down stirring is specifically reduced by 10r every 5 min.

[0045] Example 3:

[0046] An anti-sagging and thermal insulation self-cleaning paint for building exterior walls, comprising the following parts by weight: 100 parts of silicone acrylic emulsion, 50 parts of elastic emulsion, 15 parts of polyacrylamide, 15 parts of prefabricated fiber coating material, and sodium humate 6 parts, 3 parts of expanded vermiculite, 20 parts of fillers, 3 parts of additives, 30 parts of water.

[0047] among them:

[0048] The prefabricated fiber coating material includes the following components by mass percentage: 15% short polyamide fiber, 20% nano-silica, 1% nano-zinc oxide, 0.8% hydrogenated polydimethylsiloxane, and 0.3 cocoyl monoethanolamine %, the balance of polyethylene glycol solution.

[0049] The preparation method of the prefabricated fiber coating is as follows: add short polyamide fiber to a proper amount of polyethylene glycol solution, heat and stir at 45-50°C for 1 hour, then add cocoyl monoethanolamine to it, continue to stir for 50 minutes, and obtain a material for use; Add nano-silicon oxide to the remaining polyethylene glycol solution, ultrasonically disperse for 10 minutes, then add material one slowly under stirring conditions, and stir at high speed for 30 minutes after the addition is complete to obtain material two for use; add nano zinc oxide and hydrogenated polyethylene The base siloxanes are added sequentially under stirring conditions, and after the addition is completed, the temperature is kept at 40±2°C for 8-10 hours, and then freeze-dried to obtain the prefabricated fiber coating material. Among them: the polyethylene glycol solution is a 3.5% by mass polyethylene glycol 200 aqueous solution, the polyethylene glycol solution blended with polyamide staple fibers accounts for 30% of the total solution volume; the ultrasonic dispersion frequency is 30KHz, and the temperature It is 32±2℃; the high-speed stirring speed is 600rpm.

[0050] Fillers include brucite powder, light calcium carbonate, ultra-fine talc powder, carbon black 6800, and the mass percentage of each component is brucite powder 5%, ultra-fine talc powder 30%, carbon black 68005%, light weight Calcium carbonate balance.

[0051] Auxiliary agents include cross-linking agent, plasticizer, surfactant, defoaming agent, the weight percentage of the four is 30% of cross-linking agent, 45% of plasticizer, 10% of surfactant, and 15% of defoaming agent. %. Among them: the crosslinking agent is a composition of methyl orthosilicate and ethylene glycol dimethacrylate with a mass ratio of 1:3; the plasticizer is SCT-275, ASE-60, chlorine with a mass ratio of 1:1:2.5 Fossil wax composition; the surfactant is a fatty acid methyl ester ethoxylate sulfonate and fatty acid methyl sulfonate composition with a mass ratio of 1:0.3; the defoamer is a polydimethyl group with a mass ratio of 1:0.5 Silicone, polyoxypropylene oxide ethylene glycerol ether composition.

[0052] The anti-sagging and thermal insulation self-cleaning paint for building exterior walls, the preparation method is the same as that of Example 1, wherein: the intermittent mixing in step 1) is specifically stirring for 15 minutes, standing for 15 minutes, and this is an operation for looping, looping 3 times ; Step 2) The uniform slow-down stirring is specifically reduced by 10r every 5 min.