Synthesis of silane coupling agents modified core-shell acrylate emulsions
In order to solve the problem of"viscous when heated while brittle when cooled"with traditional acrylic emulsion,core-shell structure acrylate emulsions with soft core and hard shell particles were prepared from main monomers of methyl methacrylate(MMA),styrene(St)and butyl acrylate(BA)and modifying monomers of silane coupling agents,and characterized by FTIR,TG and DSC.The influence of crosslinked monomers on the properties of emulsion was investigated.The particle size of the emulsion was tested.The results showed that the emulsion exhibited better stability and film formation ability when the mass fraction of styrene was 15.0%(based on the mass of all monomers in the core and shell layers,the same below),the theoretical glass transition temperature(Tg)of the core layer and the shell layer were-10.0℃and 30.0℃respectively,and the mass fraction of cross-linked monomer vinyltriethoxysilane(A-151)in core layer and gamma-methacryloxy propyl trimethoxysilane(A-174)in shell layer was 3.0%and 2.0%,respectively.Compared with those of the homogeneous particle structure without crosslinked monomer,the maximum thermal adhesion temperature of the core-shell structure polymer was increased by 90℃,the water absorption was reduced by 10.77%,which alleviated the high-temperature adhesion problem of ink coatings while improved the water and heat resistance of the coating film.
water-based ink binderacrylate emulsionssilane coupling agentscore-shell structureacrylic series chemicals
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