Study On Modification And Properties Of Styrene-Acrylate Emulsion

In recent years,people's requirements for quality of life are constantly improving,and the concept of green environmental protection is deeply rooted in people's minds.As a film-forming substance for water-based paints,styrene-acrylic emulsion has advantages of low pollution,low film forming temperature and high bonding strength.However,styrene-acrylic emulsion has some shortcomings in water resistance,corrosion resistance and wear resistance,so its functional modification has received extensive attention.First,the research progress of acrylate emulsion modified by graphene,silicone,organic fluorine and self-crosslinking monomer in recent years were reviewed in this paper.The application of modified acrylic resin emulsion was introduced in detail,and the future development was prospected.Then styrene-acrylic emulsion was modified by different functional monomers,and the properties of the prepared emulsions were analyzed and studied.The results showed that the water absorption rate of the emulsion was the lowest when the amount of hydroxymethylacrylamide/acrylic acid was 5%,using hydroxymethylacrylamide/acrylic acid,diacetoneacrylamide/adipic acid dihydrazide and vinyltriethoxysilane as crosslinking monomers;when the ratio of diacetone acrylamide to diacylhydrazide adipate was 1:1,the crosslinking degree of latex film was the highest;and when the content of vinyltriethoxysilane was 4%,the latex film showed excellent heat resistance,and the comprehensive properties of the latex and the latex film were the best.Finally,three silane coupling agents KH560,KH570 and KH590 were used to modify the surface of graphene oxide,and then functional graphene oxide was added to styrene-acrylic emulsion by mechanical blending to achieve the modification of styrene-acrylic emulsion.The results showed that the anti-corrosion,medium resistance and salt spray resistance of the emulsion were the best when the dosages of KH560,KH570 and KH590 were 0.5%,0.7%and 0.3%respectively.It was also found that when reactive emulsifier SR-10 was used and the mass ratio of tertiary vinyl carbonate to styrene was 1:9,the water absorption rate of the emulsion was the lowest,and the comprehensive properties of the emulsion and the latex film were the best.