CN115819808A - Water-resistant redispersible latex powder and preparation method thereof - Google Patents
Water-resistant redispersible latex powder and preparation method thereof Download PDFInfo
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- CN115819808A CN115819808A CN202310032084.6A CN202310032084A CN115819808A CN 115819808 A CN115819808 A CN 115819808A CN 202310032084 A CN202310032084 A CN 202310032084A CN 115819808 A CN115819808 A CN 115819808A
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- redispersible latex
- polyvinyl alcohol
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- 239000000843 powder Substances 0.000 title claims abstract description 93
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000004816 latex Substances 0.000 title claims abstract description 62
- 229920000126 latex Polymers 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000000839 emulsion Substances 0.000 claims abstract description 67
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 38
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 37
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 31
- 229920000642 polymer Polymers 0.000 claims abstract description 27
- 239000007864 aqueous solution Substances 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract 2
- 239000007787 solid Substances 0.000 claims description 28
- 238000001035 drying Methods 0.000 claims description 23
- 229920001971 elastomer Polymers 0.000 claims description 17
- 229920001038 ethylene copolymer Polymers 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 9
- 238000006136 alcoholysis reaction Methods 0.000 claims description 7
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 238000001694 spray drying Methods 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 4
- 125000005375 organosiloxane group Chemical group 0.000 claims description 3
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 238000009690 centrifugal atomisation Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 239000004570 mortar (masonry) Substances 0.000 abstract description 9
- 239000004566 building material Substances 0.000 abstract description 2
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 28
- 239000004793 Polystyrene Substances 0.000 description 21
- 229920002223 polystyrene Polymers 0.000 description 21
- 239000000853 adhesive Substances 0.000 description 17
- 230000001070 adhesive effect Effects 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 15
- 239000011083 cement mortar Substances 0.000 description 9
- 239000004567 concrete Substances 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 238000011056 performance test Methods 0.000 description 7
- 229920006389 polyphenyl polymer Polymers 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- 239000004568 cement Substances 0.000 description 5
- 239000003431 cross linking reagent Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical group 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 3
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
Landscapes
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a water-resistant redispersible latex powder and a preparation method thereof, wherein the raw materials comprise polymer emulsion, polyvinyl alcohol aqueous solution, an anti-caking agent and organic siloxane grafted polyvinyl formal. The redispersible latex powder has excellent dispersibility, flowability and water resistance, is an environment-friendly product which can be used in high-performance building materials, can promote the application of the redispersible latex powder in building mortar, special waterproof materials and the like, and has wide market prospect.
Description
Technical Field
The invention relates to the field of dry-mixed mortar additives, in particular to water-resistant redispersible latex powder and a preparation method thereof.
Background
The redispersible latex powder is a redispersible powder obtained by modifying a polymer emulsion by adding other substances and performing spray drying. After the mortar is mixed with the mortar, the curing reaction of the polymer and the hydration reaction of the cement are carried out simultaneously, so that an interpenetrating network structure of the polymer and the cement gel is formed. The structure can connect aggregate more firmly, thereby improving the performance of cement mortar. Redispersible latex powder prepared from vinyl acetate/ethylene copolymer (VAE) emulsion occupies the main dry-mixed mortar market all over the world, but the waterproof performance of the latex powder is generally poor.
Patent CN110684307A describes a water-resistant redispersible latex powder which is resistant to water for 8h without falling off. But the method used by the invention is to add an organic silicon cross-linking agent to increase the water resistance of the rubber powder. The organosilicon cross-linking agent has low surface tension, is easy to adhere to the surface of a cement hydration product in the mortar hardening process, influences the cement hydration reaction rate, and causes the early strength of the mortar to be too low.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a water-resistant redispersible latex powder and a preparation method thereof, so as to effectively overcome the defects of low early strength and poor water resistance of the product in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a water-resistant redispersible latex powder comprises polymer emulsion, aqueous solution of polyvinyl alcohol, anti-blocking agent and organic siloxane grafted polyvinyl formal.
Further, the polymer emulsion is a mixture of vinyl acetate-versatic acid ethylene copolymer emulsion and at least one of vinyl acetate-ethylene copolymer emulsion and polyacrylate emulsion, and the mass percentage of the vinyl acetate-versatic acid ethylene copolymer emulsion accounts for 30-40% of the total mass of the polymer emulsion.
Further, the solid content of the polymer emulsion is 45% -60%, and the viscosity is 2300mPa.s-5400mPa.s.
Further, the polymerization degree of the polyvinyl alcohol is 500-2400, and the alcoholysis degree is 78-90%.
Further, the solid content of the polyvinyl alcohol aqueous solution is 15% -30%, and the mass ratio of the polyvinyl alcohol aqueous solution to the polymer emulsion is 1.
Further, the addition amount of the anti-caking agent accounts for 1% -4% of the mass of solids in the polymer emulsion, the polyvinyl alcohol aqueous solution and the organosiloxane grafted polyvinyl formal; the addition amount of the organosiloxane grafted polyvinyl formal accounts for 0.5-1.5% of the mass of solids in the polymer emulsion and the polyvinyl alcohol aqueous solution.
Further, the anti-caking agent is at least one of heavy calcium powder, talcum powder, kaolin, bentonite and fumed silica.
The preparation method of the water-resistant redispersible latex powder comprises the following steps:
step 1, adding water into polyvinyl alcohol, heating and stirring to prepare a polyvinyl alcohol aqueous solution;
step 2, mixing the polyvinyl alcohol aqueous solution, the polymer emulsion and the organic siloxane grafted polyvinyl formal according to a ratio, and uniformly stirring to obtain a spray solution;
and 3, conveying the prepared spray liquid into drying equipment for spray drying, carrying out high-speed centrifugal atomization to form micro droplets, adding an anti-caking agent from a feeding port above the drying equipment through compressed air to prevent bonding, and then cooling and separating the obtained rubber powder particles to obtain the water-resistant redispersible latex powder.
Compared with the prior art, the invention has the beneficial effects that:
1. the redispersible latex powder has excellent dispersibility, flowability and water resistance, is an environment-friendly product which can be used in high-performance building materials, can promote the application of the redispersible latex powder in building mortar, special waterproof materials and the like, and has wide market prospect.
2. In the formula system of the redispersible latex powder, the organic siloxane grafted polyvinyl formal can improve the water resistance of the redispersible latex powder, and the annular structure of the organic siloxane grafted polyvinyl formal can show stronger bonding force to an EPS (expandable polystyrene) plate due to the similarity and intermiscibility principle.
3. In the formula system of the redispersible latex powder, under the alkaline condition of cement mortar, the organic siloxane grafted polyvinyl formal has better chemical stability compared with an organic silicon cross-linking agent, is not easy to decompose, has higher surface tension than the organic silicon cross-linking agent, and cannot interfere the hydration action of cement to influence the early strength of the mortar.
4. The preparation process of the redispersible latex powder of the invention uses the original production conditions, and does not need to add new process equipment.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The polyvinyl alcohols and organosiloxane-grafted polyvinyl formals used in the examples below, each having a degree of polymerization and alcoholysis, are commercially available, as follows: available from Anhui Uygur, anhui, uygur, inc.
Each of the polymer emulsions used in the following examples is commercially available as follows: the vinyl acetate-ethylene copolymer emulsion can be purchased from Guangxi Anhui vitamin materials science and technology Limited, model 705; vinyl acetate-vinyl versatate copolymer emulsions are available from Shandong Haoyao New materials, inc.; polyacrylate emulsions are available from Minde chemical Co., ltd, of Jinan.
Example 1
The preparation method of the water-resistant redispersible latex powder of this example is as follows:
step 1: adding water into polyvinyl alcohol with the polymerization degree of 1200 and the alcoholysis degree of 80%, heating and stirring to prepare a polyvinyl alcohol aqueous solution with the solid content of 18%.
Step 2: mixing a polyvinyl alcohol aqueous solution with a vinyl acetate-ethylene copolymer emulsion (with the viscosity of 2400Pa & s and the solid content of 48%) and a vinyl acetate-tertiary carboxylic acid ethylene copolymer emulsion (with the viscosity of 2400Pa & s and the solid content of 48%) according to a mass ratio of 1:3.1:1.4, adding the organic siloxane grafted polyvinyl formal, mixing, and uniformly stirring to obtain the spray solution. Wherein, the addition amount of the organic siloxane grafted polyvinyl formal accounts for 1.5 percent of the solid mass in the polymer emulsion and the polyvinyl alcohol aqueous solution.
And step 3: and (3) conveying the prepared spray liquid to drying equipment for spray drying, and controlling the air inlet temperature of the drying equipment to be 120 ℃ and the air outlet temperature to be 80 ℃. And when the inlet air temperature reaches the set temperature, feeding is started, the feeding speed must be gradually adjusted from low to high, the flow is properly adjusted until the outlet temperature meets the requirement and is stable, and meanwhile, an anti-caking agent is added from a feeding port above the drying equipment through compressed air to prevent bonding, so that the water-resistant re-dispersible latex powder is obtained. Wherein: the anti-caking agent is prepared from heavy calcium powder and gas-phase silicon dioxide according to the mass ratio of 2:1, the addition amount of the anti-caking agent accounts for 2 percent of the solid content of the spray liquid.
The latex powder obtained in this example was subjected to the following performance tests:
1. water resistance
The rubber powder is dispersed into regenerated emulsion when meeting water, and the regenerated emulsion is subjected to film forming again and drying, so that the rubber powder does not fall off after being resistant to water for 8 hours.
2. Adhesive strength
The water resistance strength of the redispersible emulsion powder obtained in the embodiment is tested according to the GB/T29906-2013 molded polyphenyl board thin plastered exterior wall external thermal insulation system material standard, and the result is as follows: the bonding strength between the polystyrene board and the molded polystyrene board is 0.12MPa, and the bonding strength between the polystyrene board and the concrete board is 0.80MPa.
3. Early strength
The redispersible latex powder obtained in this example was tested for three-day strength according to the GBT17671-1999 cement mortar strength test method, and the results showed that the redispersible latex powder of this example had a compressive strength of 12.5MPa.
Example 2
The preparation method of the water-resistant redispersible latex powder of this example is as follows:
step 1: adding water into polyvinyl alcohol with the polymerization degree of 1400 and the alcoholysis degree of 84%, heating and stirring to prepare a polyvinyl alcohol aqueous solution with the solid content of 21%.
Step 2: mixing a polyvinyl alcohol aqueous solution with a vinyl acetate-ethylene copolymer emulsion (the viscosity is 3200 Pa.s, the solid content is 48%) and a vinyl acetate-tertiary carboxylic acid ethylene copolymer emulsion (the viscosity is 3000 Pa.s, the solid content is 45%) according to a mass ratio of 1:2.8:1.7, adding the organic siloxane grafted polyvinyl formal, mixing, and uniformly stirring to obtain the spray solution. Wherein the addition of the organosiloxane-grafted polyvinyl formal accounts for 1.5% of the mass of the solids in the polymer emulsion and the aqueous polyvinyl alcohol solution.
And step 3: and (3) conveying the prepared spray liquid to drying equipment for spray drying, and controlling the air inlet temperature of the drying equipment to be 120 ℃ and the air outlet temperature to be 80 ℃. And when the inlet air temperature reaches the set temperature, feeding is started, the feeding speed must be gradually adjusted from low to high, the flow is properly adjusted until the outlet temperature meets the requirement and is stable, and meanwhile, an anti-caking agent is added from a feeding port above the drying equipment through compressed air to prevent bonding, so that the water-resistant re-dispersible latex powder is obtained. Wherein: the anti-caking agent is prepared from heavy calcium powder and gas-phase silicon dioxide according to the mass ratio of 2:1, the addition amount of the anti-caking agent accounts for 2 percent of the solid content of the spray liquid.
The latex powder obtained in this example was subjected to the following performance tests:
1. water resistance
The rubber powder is dispersed into regenerated emulsion when meeting water, and the regenerated emulsion is subjected to film forming again and drying, so that the rubber powder does not fall off after being resistant to water for 8 hours.
2. Adhesive strength
The water resistance strength of the redispersible emulsion powder obtained in the embodiment is tested according to the GB/T29906-2013 molded polyphenyl board thin plastered exterior wall external thermal insulation system material standard, and the result is as follows: the bonding strength between the polystyrene board and the molded polystyrene board is 0.13MPa, and the bonding strength between the polystyrene board and the concrete board is 0.82MPa.
3. Early strength
The redispersible latex powder obtained in this example was tested for three-day strength according to the GBT17671-1999 cement mortar strength test method, and the results showed that the redispersible latex powder of this example had a compressive strength of 12.9MPa.
Example 3
The preparation method of the water-resistant redispersible latex powder of this example is as follows:
step 1: adding water into polyvinyl alcohol with the polymerization degree of 2200 and the alcoholysis degree of 86%, heating and stirring to prepare a polyvinyl alcohol aqueous solution.
Step 2: mixing a polyvinyl alcohol aqueous solution with a vinyl acetate-ethylene copolymer emulsion (viscosity is 4400Pa & s, solid content is 56%), and a vinyl acetate-tertiary carboxylic acid ethylene copolymer emulsion (viscosity is 5200Pa & s, solid content is 58%) according to a mass ratio of 1:2.7:1.8, adding organic siloxane grafted polyvinyl formal, mixing, and uniformly stirring to obtain a spray solution. Wherein the addition amount of the organic siloxane grafted polyvinyl formal accounts for 1.5 percent of the mass of the solid in the polymer emulsion and the polyvinyl alcohol aqueous solution.
And step 3: and (3) conveying the prepared spray solution to drying equipment for spray drying, and controlling the air inlet temperature of the drying equipment to be 120 ℃ and the air outlet temperature to be 80 ℃. And when the inlet air temperature reaches the set temperature, feeding is started, the feeding speed must be gradually adjusted from low to high, the flow is properly adjusted until the outlet temperature meets the requirement and is stable, and meanwhile, an anti-caking agent is added from a feeding port above the drying equipment through compressed air to prevent bonding, so that the water-resistant re-dispersible latex powder is obtained. Wherein: the anti-caking agent is prepared from heavy calcium powder and gas-phase silicon dioxide according to the mass ratio of 2:1, the addition amount of the anti-caking agent accounts for 2 percent of the solid content of the spray liquid.
The latex powder obtained in this example was subjected to the following performance tests:
1. water resistance
The rubber powder is dispersed into regenerated emulsion when meeting water, and the regenerated emulsion is subjected to film forming again and drying, so that the rubber powder does not fall off after being resistant to water for 8 hours.
2. Adhesive strength
The redispersible latex powder obtained in the embodiment is tested according to the GB/T29906-2013 molded polyphenyl board thin plastered external thermal insulation system material standard, and the result is that: the adhesive strength between the polystyrene board and the molded polystyrene board is 0.14MPa, and the adhesive strength between the polystyrene board and the concrete board is 0.84MPa.
3. Early strength
The three-day strength of the redispersible latex powder obtained in the embodiment is tested according to the GBT17671-1999 cement mortar strength test method, and the results show that the redispersible latex powder has a compressive strength of 13.1MPa.
Example 4
The preparation method of the water-resistant redispersible latex powder of this example is as follows:
step 1: adding water into polyvinyl alcohol with polymerization degree of 2000 and alcoholysis degree of 82%, heating and stirring to obtain polyvinyl alcohol aqueous solution.
Step 2: mixing a polyvinyl alcohol aqueous solution, a vinyl acetate-ethylene copolymer emulsion (viscosity is 4400 Pa.s, solid content is 56%), a vinyl acetate-tertiary carboxylic acid ethylene copolymer emulsion (viscosity is 5200 Pa.s, solid content is 58%), a polyacrylate emulsion according to a mass ratio of 1:2.9:1.5:0.1, adding organic siloxane grafted polyvinyl formal, mixing, and uniformly stirring to obtain a spray solution. Wherein the addition amount of the organic siloxane grafted polyvinyl formal accounts for 1.5 percent of the mass of the solid in the polymer emulsion and the polyvinyl alcohol aqueous solution.
And 3, step 3: and (3) conveying the prepared spray liquid to drying equipment for spray drying, and controlling the air inlet temperature of the drying equipment to be 120 ℃ and the air outlet temperature to be 80 ℃. And when the inlet air temperature reaches the set temperature, feeding is started, the feeding speed must be gradually adjusted from low to high, the flow is properly adjusted until the outlet temperature meets the requirement and is stable, and meanwhile, an anti-caking agent is added from a feeding port above the drying equipment through compressed air to prevent bonding, so that the water-resistant re-dispersible latex powder is obtained. Wherein: the anti-caking agent is prepared from heavy calcium powder and gas-phase silicon dioxide according to the mass ratio of 2:1, wherein the addition amount of the anti-caking agent accounts for 2 percent of the solid content of the spray liquid.
The latex powder obtained in this example was subjected to the following performance tests:
1. water resistance
The rubber powder is dispersed into regenerated emulsion when meeting water, and the regenerated emulsion is subjected to film forming again and drying, so that the rubber powder does not fall off after being resistant to water for 8 hours.
2. Adhesive strength
The water resistance strength of the redispersible emulsion powder obtained in the embodiment is tested according to the GB/T29906-2013 molded polyphenyl board thin plastered exterior wall external thermal insulation system material standard, and the result is as follows: the adhesive strength between the polystyrene board and the molded polystyrene board is 0.13MPa, and the adhesive strength between the polystyrene board and the concrete board is 0.81MPa.
3. Early strength
The redispersible latex powder obtained in this example was tested for three-day strength according to the GBT17671-1999 cement mortar strength test method, and the results showed that the redispersible latex powder of this example had a compressive strength of 12.7MPa.
Comparative example 1
The redispersible latex powder is prepared in the same manner as in comparative example 1, except that: in step 2, the amount of organosiloxane-grafted polyvinyl butyral added was 0.5% of the mass of the solids in the polymer emulsion and the aqueous polyvinyl alcohol solution.
The latex powder obtained in the comparative example is subjected to the following performance tests:
1. water resistance
The rubber powder is dispersed into regenerated emulsion when meeting water, and the regenerated emulsion is subjected to film forming again and drying, so that the rubber powder does not fall off after being resistant to water for 8 hours.
2. Adhesive strength
The water resistance strength of the redispersible latex powder obtained in the comparative example is tested according to the GB/T29906-2013 molded polyphenyl board thin plastered external thermal insulation system material standard, and the result is as follows: the adhesive strength between the polystyrene board and the molded polystyrene board is 0.09MPa, and the adhesive strength between the polystyrene board and the concrete board is 0.74MPa.
3. Early strength
The three-day strength of the redispersible latex powder obtained in the comparative example is tested according to the GBT17671-1999 cement mortar strength test method, and the results show that the redispersible latex powder of the embodiment has a compressive strength of 12.3MPa.
Comparative example 2
The redispersible latex powder is prepared in the same manner as in comparative example 1, except that: in step 2, the amount of organosiloxane-grafted polyvinyl butyral added was 2% of the mass of the solids in the polymer emulsion and the aqueous polyvinyl alcohol solution.
The latex powder obtained in the comparative example is subjected to the following performance tests:
1. water resistance
The rubber powder is dispersed into regenerated emulsion when meeting water, and the regenerated emulsion is subjected to film forming again and drying, so that the rubber powder does not fall off after being resistant to water for 8 hours.
2. Adhesive strength
According to the GB/T29906-2013 molded polyphenyl board thin plastered exterior wall external thermal insulation system material standard, the water resistance strength of the redispersible emulsion powder obtained in the comparative example is tested, and the result is as follows: the adhesive strength between the polystyrene board and the molded polystyrene board is 0.09MPa, and the adhesive strength between the polystyrene board and the concrete board is 0.75MPa.
3. Early strength
The three-day strength of the redispersible latex powder obtained in the comparative example is tested according to the GBT17671-1999 cement mortar strength test method, and the results show that the redispersible latex powder of the embodiment has a compressive strength of 12.1MPa.
Comparative example 3
The redispersible latex powder is prepared in the same manner as in comparative example 1, except that: the organosiloxane-grafted polyvinyl butyral from step 2 was replaced with an organosilicon crosslinker (hydrogen-containing silicone oil).
The latex powder obtained in the comparative example is subjected to the following performance tests:
1. water resistance
The rubber powder is dispersed into regenerated emulsion when meeting water, and the regenerated emulsion is subjected to film forming again and drying, so that the rubber powder does not fall off after being resistant to water for 8 hours.
2. Adhesive strength
According to the GB/T29906-2013 molded polyphenyl board thin plastered exterior wall external thermal insulation system material standard, the water resistance strength of the redispersible emulsion powder obtained in the comparative example is tested, and the result is as follows: the adhesive strength between the polystyrene board and the molded polystyrene board is 0.07MPa, and the adhesive strength between the polystyrene board and the concrete board is 0.73MPa.
4. Early strength
The three-day strength of the redispersible emulsion powder obtained in the comparative example is tested according to the GBT17671-1999 cement mortar strength test method, and the result shows that the redispersible emulsion powder added with the organic silicon cross-linking agent has the compressive strength of 9.6MPa.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A water-resistant redispersible latex powder characterized in that: the raw materials of the water-resistant redispersible latex powder comprise polymer emulsion, polyvinyl alcohol aqueous solution, anti-caking agent and organic siloxane grafted polyvinyl formal.
2. The water-resistant redispersible latex powder of claim 1 wherein: the polymer emulsion is a mixture of vinyl acetate-versatic acid ethylene copolymer emulsion and at least one of vinyl acetate-ethylene copolymer emulsion and polyacrylate emulsion, and the mass percentage of the vinyl acetate-versatic acid ethylene copolymer emulsion accounts for 30-40% of the total mass of the polymer emulsion.
3. The water-resistant redispersible latex powder as claimed in claim 1 or 2, wherein: the solid content of the polymer emulsion is 45-60%, and the viscosity is 2300-5400mPa.s.
4. The water-resistant redispersible latex powder of claim 1 wherein: the polymerization degree of the polyvinyl alcohol is 500-2400, and the alcoholysis degree is 78-90%.
5. The water-resistant redispersible latex powder of claim 1 wherein: the solid content of the polyvinyl alcohol aqueous solution is 15% -30%, and the mass ratio of the polyvinyl alcohol aqueous solution to the polymer emulsion is 1.
6. The water-resistant redispersible latex powder of claim 1 wherein: the addition amount of the anti-caking agent accounts for 1-4% of the mass of the solids in the polymer emulsion, the polyvinyl alcohol aqueous solution and the organosiloxane grafted polyvinyl formal; the addition amount of the organic siloxane grafted polyvinyl formal accounts for 0.5 to 1.5 percent of the mass of the solid in the polymer emulsion and the polyvinyl alcohol aqueous solution.
7. The water-resistant redispersible latex powder of claim 1 wherein: the anti-caking agent is at least one of heavy calcium powder, talcum powder, kaolin, bentonite and gas-phase silicon dioxide.
8. A method for preparing the water-resistant redispersible latex powder of any one of claims 1 to 7, comprising the steps of:
step 1, adding water into polyvinyl alcohol, heating and stirring to prepare a polyvinyl alcohol aqueous solution;
step 2, mixing the polyvinyl alcohol aqueous solution, the polymer emulsion and the organic siloxane grafted polyvinyl formal according to a ratio, and uniformly stirring to obtain a spray solution;
and 3, conveying the prepared spray liquid into drying equipment for spray drying, carrying out high-speed centrifugal atomization to form micro droplets, adding an anti-caking agent from a feeding port above the drying equipment through compressed air to prevent bonding, and then cooling and separating the obtained rubber powder particles to obtain the water-resistant redispersible latex powder.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032084.6A CN115819808A (en) | 2023-01-10 | 2023-01-10 | Water-resistant redispersible latex powder and preparation method thereof |
Applications Claiming Priority (1)
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