Synthesis method of organic silicon modified acrylate copolymer

Abstract

The invention discloses a synthesis method of an organic silicon modified acrylate copolymer by using an emulsion copolymerization method. The synthesis method comprises the following steps: (1) synthesizing organic silicon seed emulsion: adding emulsifier and deionized water according to a proportion in a formula into a three-mouth flask provided with a stirrer, a dropping funnel and a reflux condensing tube by using a semicontinuous dropping method, adjusting the bath temperature to 75 DEG C, then, adding catalyst and dropwise adding organic silicon monomers, and after the dropwise adding is finished, introducing nitrogen gas for 30 minutes; reacting for 5 hours, slowly cooling, adjusting the pH value of the system to 7-8 by using 10% sodium carbonate solution and standing the solution for 12 hours; and (2) carrying out graft copolymerization by using acrylic ester monomers: dropwise adding acrylic ester monomers and initiator by also adopting the semicontinuous dropping method after adjusting the reaction temperature to 75 DEG C, and introducing nitrogen gas for 30 minutes; reacting for 5 hours, adjusting the pH value to 7-8 by using ammonia water; and discharging. The synthesis method is simple in process, efficient and environment friendly, the organic silicon content of the prepared emulsion is over 50%, and no agglomeration is generated.

Description

technical field [0001] The invention relates to a method for synthesizing an organosilicon-modified acrylate copolymer, in particular to a method for preparing an organosilicon-modified acrylate copolymer by emulsion copolymerization. Background technique [0002] At present, most of the conventional plastics in the domestic and foreign coating markets are solvent-based coatings, and their construction and application cause serious environmental pollution. The environmental protection laws of various countries in the world are becoming increasingly strict, and people's environmental awareness is also increasing. Curable and water-based" has become the development direction of environmentally friendly green coatings. [0003] As a high-quality water-based coating, acrylate copolymer has unique advantages over ordinary organic polymer materials. Acrylate copolymer has the advantages of excellent film-forming properties, weather resistance, and low price, but its disadvantages...

AI Technical Summary

Problems solved by technology

However, in the conventional emulsion polymerization process, since the active silicone monomers containing vinyl groups are prone to hydrolysis and condensation reactions in water, it is difficult to increase the content of silicone, and it is easy to form coagulation, which not only makes the emulsion unstable, but also difficult to The composition of the copolymer is controlled, and the film-forming property is not good, which is the main difficulty in the preparation of silicone-modified acrylic copolymer by emulsion polymerization

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