| 摘要 |
A copolymer aqueous dispersion, based on vinylester of versatic acid, vinylacetate and acrylate esters, is prepared by emulsion copolymerization in such a way, that to an aqueous phase components of an emulsion system are dosed which system consists of a protective colloid (polyvinylalcohol) and a nonionogenic emulsifier (alkylpolyglycolether), further an electrolyte, and necessary amount of water. After heating the aqueous phase to a temperature of approximately 70 DEG C, a starting dose of a mixture of monomers is added to the aqueous phase, and polymerization reaction is started by adding a predetermined amount of potassium, sodium or ammonium peroxodisulfate. After the starting dose of the mixture of monomers has polymerized, the rest amount of the mixture of monomers is started to be added to the reaction system. After termination of dosing the dispersion is maintained at a temperature of 79 to 80 DEG C for 30 to 45 minutes, it is cooled down, and after a modification the process of its preparation is completed. |
