Vinylacetate nonsoap emulsion, redispersible rubber powder and preparation methods thereof

A technology of redispersible rubber powder and vinyl acetate, which is applied in the field of vinyl acetate soap-free emulsions, can solve the problems of poor redispersibility of redispersible latex powder, high air content of mortar, and low bonding strength, etc., and achieves Improve the bonding performance, increase the tensile bond strength, and improve the effect of water resistance

Active Publication Date: 2011-04-20
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing redispersible latex po

Method used

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  • Vinylacetate nonsoap emulsion, redispersible rubber powder and preparation methods thereof
  • Vinylacetate nonsoap emulsion, redispersible rubber powder and preparation methods thereof
  • Vinylacetate nonsoap emulsion, redispersible rubber powder and preparation methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] (1) Preparation of vinyl acetate soap-free emulsion

[0032] The monomer composition is vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate, and its component formula is as follows:

[0033]

[0034] First, add water, sodium bicarbonate, protective colloid and emulsifier to the polymerization kettle, adjust the stirring speed to 60r / min, heat to 80±2°C, and stir for 1 hour. Add 15% mixed monomers composed of vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate and 20% potassium persulfate initiator solution to the reaction kettle, react for 30 minutes, and finally form a blue transparent Seed emulsion. Then add the remaining mixed monomer and initiator solution dropwise to control the dropping rate so that the reaction temperature is controlled at 80±2°C, the polymerization reaction time is 3 hours, and the maturation is continued for 1 hour. The temperature is lowered to 40°C, and the material is filtere...

Example Embodiment

[0040] Example 2:

[0041] (1) Preparation of vinyl acetate soap-free emulsion

[0042] The monomer composition is vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate, and its component formula is as follows:

[0043]

[0044] First, add water, sodium bicarbonate, protective colloid and emulsifier to the polymerization kettle, adjust the stirring speed to 60r / min, heat to 70±2°C, and stir for 1 hour. Add 5% of the mixed monomer composed of vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate and 10% potassium persulfate initiator solution to the reaction kettle, react for 1 hour, and finally form a blue transparent Seed emulsion. Then add the remaining mixed monomer and initiator solution dropwise to control the dropping rate so that the reaction temperature is controlled at 90±2°C, the polymerization reaction time is 4 hours, and the maturation is continued for 1 hour. The temperature is lowered to 60°C, and the material is filte...

Example Embodiment

[0050] Example 3:

[0051] (1) Preparation of vinyl acetate soap-free emulsion

[0052] The monomer composition is vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate, and its component formula is as follows:

[0053]

[0054] First add water, sodium bicarbonate, protective colloid and emulsifier to the polymerization kettle, adjust the stirring speed to 60r / min, heat to 75±2°C, and stir for 1 hour. Add 10% mixed monomers composed of vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate and 15% potassium persulfate initiator solution to the reactor, react for 45 minutes, and finally form a blue transparent Seed emulsion. Then add the remaining mixed monomer and initiator solution dropwise to control the dropping rate so that the reaction temperature is controlled at 85±2°C, the polymerization reaction time is 5 hours, and the maturation is continued for 1 hour. The temperature is lowered to 50°C, and the material is filtered out to...

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Abstract

The invention relates to vinylacetate nonsoap emulsion, redispersible rubber powder and preparation methods thereof. The vinylacetate nonsoap emulsion comprises the following components in percentage by mass: 5 to 10 percent of protective colloid, 0.1 to 0.5 percent of sodium bicarbonate, 30 to 60 percent of vinylacetate, 5 to 30 percent of tertiary vinyl carbonate, 5 to 30 percent of butyl acrylate, 0.5 to 5 percent of emulsifier, 0.1 to 0.5 percent of initiator and the balance of water. The redispersible rubber powder is prepared by spray-drying the mixture of the following components in percentage by mass: 70 to 80 percent of vinylacetate nonsoap emulsion, 5 to 15 percent of protective colloid, 5 to 15 percent of anticaking agent and the balance of water. Compared with the conventional dispersible polymer powder, the redispersible rubber powder can improve the new stirring performance, mechanical performance and adhesive performance of modified mortar obviously.

Description

technical field [0001] The invention relates to a vinyl acetate soap-free emulsion, a redispersible rubber powder and a preparation method thereof. Background technique [0002] Redispersible latex powder is obtained by spray-drying polymer emulsion. The redispersible latex powder can regenerate the dispersion after being dispersed in water, and has the properties of the original polymer emulsion. When this polymer powder is mixed with concrete or cement mortar, it forms a polymer film with the disappearance of water in the mortar. This film forms a stable system under the action of cement and will not become an emulsion due to re-adding water. . Redispersible latex powder is mainly used in exterior insulation and finishing system (EIFS) adhesives; adhesives for tiles and construction; self-leveling floors; construction putty and other fields. Redispersible latex powder can improve various properties of mortar, such as: improving the cohesion and cohesion of materials; re...

Claims

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Application Information

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IPC IPC(8): C08F218/08C08F218/00C08F220/18C08F2/24C08L31/04C08J3/12
Inventor 丁蓓缪昌文杨冲唐文睿
Owner JIANGSU SOBUTE NEW MATERIALS
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