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
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Embodiment 1
[0031] (1) Preparation of vinyl acetate type 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 into the polymerization kettle, adjust the stirring speed to 60r / min, heat to 80±2°C, and stir for 1 hour. Add 15% of 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 dropwise, react for 30 minutes, and finally form a blue transparent Seed lotion. Then add the remaining mixed monomer and initiator solution dropwise, control the dropping speed, control the reaction temperature at 80±2° C., the polymerization reaction time is 3 hours, and continue to ripen for 1 hour. Cool down to 40°C, filter and discharge to obtain vinyl acetate soap-free emul...
Embodiment 2
[0041] (1) Preparation of vinyl acetate type 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 into the polymerization kettle, adjust the stirring speed to 60r / min, heat to 70±2°C, and stir for 1 hour. Add 5% mixed monomers composed of vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate and 10% potassium persulfate initiator solution to the reaction kettle dropwise, react for 1 hour, and finally form a blue transparent Seed lotion. Then add the remaining mixed monomer and initiator solution dropwise, control the dropping speed, control the reaction temperature at 90±2° C., the polymerization reaction time is 4 hours, and continue aging for 1 hour. Cool down to 60°C, filter and discharge to obtain vinyl acetate soap-free emulsion.
[0...
Embodiment 3
[0051] (1) Preparation of vinyl acetate type 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 into the polymerization kettle, adjust the stirring speed to 60r / min, heat to 75±2°C, and stir for 1 hour. Add 10% mixed monomer consisting of vinyl acetate, vinyl tertiary carbonate, n-butyl acrylate and methyl acrylate and 15% potassium persulfate initiator solution to the reaction kettle dropwise, react for 45 minutes, and finally form a blue transparent Seed lotion. Then add the remaining mixed monomer and initiator solution dropwise, control the dropping speed, control the reaction temperature at 85±2° C., the polymerization reaction time is 5 hours, and continue to ripen for 1 hour. Cool down to 50°C, filter and discharge to obtain vinyl acetate soap-free emulsio...
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Abstract
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Application Information
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