Emulsifier-free acrylic ester emulsion polymerization method
A technology of acrylate and emulsion polymerization, applied in the direction of coating, etc., can solve the problem of lack of water resistance of latex film
Active Publication Date: 2012-05-23
CHAMPWARD CHEM IND
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Problems solved by technology
However, the tackifying resin used is water-soluble, so that the resulting latex film lacks water resistance and is not suitable for coatings.
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1～5
[0088] The carboxylic acid monomers used in Examples 1-3 are all monocarboxylic acids with carbon-carbon double bond polymerizable functional groups, but different inorganic bases are used.
[0089] Examples 4-5 use a mixture of monocarboxylic acids with carbon-carbon double bond polymerizable functional groups and different dicarboxylic acids with carbon-carbon double bond polymerizable functional groups.
[0090] The obtained water-based acrylate emulsion, the basic composition, the physical properties of the emulsion, the physical properties of the coating film and the workability of the emulsion are shown in Table 1.
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Abstract
The invention relates to an emulsifier-free acrylic ester emulsion polymerization method. For a reaction system comprising 40-60 wt% of purified water, 2-9 wt% of a carboxylic acid monomer (A) with a polymerizable functional group of a carbon-carbon double bond and 40-50 wt% of a methyl acrylicylester monomer or an acrylic ester monomer ( B ), 0.2-2.0 wt% of an inorganic alkali liquid is adopted to adjust the pH value of the reaction to 9.0-13.0, 0.2-1.0 wt% of a peroxide initiator of a sulfate is adopted to carry out emulsion polymerization, and an organic amine compound is adopted to adjustthe pH value of the resulting aqueous resin emulsion to 7.0-9.5 at the terminal stage of the reaction. The prepared aqueous resin emulsion has characteristics of particle size of about 100-130 nm, uniform distribution, good appearance, low acid value of 3.5-6.5 mgKOH / g, specific gravity of about 1.07, excellent storage stability, good permeability and easy construction, wherein the specific gravity of the prepared aqueous resin emulsion is slightly larger than the specific gravity of the water. The dry coating film by the emulsion has characteristics of good water resistance, excellent tensile strength and excellent wear resistance.
Description
technical field [0001] The present invention relates to a water-based acrylate emulsion polymerization method, in particular to an emulsifier-free acrylate emulsion polymerization method, which can provide an environmentally friendly and pollution-free water-dispersible acrylate emulsion. The particle size of the resin emulsion is small and the distribution is uniform and the appearance is good. The specific gravity is slightly larger than water, low acid value, superior storage stability, good permeability and easy construction. Its dry coating film has good water resistance, excellent tensile strength and excellent abrasion resistance. Background technique [0002] Traditionally, acrylate emulsions are based on acrylic monomers in aqueous solution, using low-molecular-weight emulsifiers for emulsion polymerization. Under stirring, the monomer is dispersed into emulsion in water or other solvents to carry out free radical polymerization. However, if it is necessary to obt...
Claims
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IPC IPC(8): C08F220/14C08F220/18C08F220/06C08F222/02C08F2/22C09D133/08C09D133/10
Inventor 廖德章胡继光张志玮
Owner CHAMPWARD CHEM IND
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