Preparation Of Emulsion With Hollow Latex Particles Film-Formable Under Room-Temperature

Seeded emulsion polymerization was adopted to prepare the hollow latex particles with soft shell layer under low emulsifier condition. Methyl methacrylate (MMA) /methacrylic acid (MAA) /butyl acrylate (BA) copolymer emulsions were first prepared under low emulsifier condition as the seed latexes, and then the seeded emulsion polymerization of MMA, MAA and divinyl benzene (DVB) were carried out to prepare the carboxylated core latex particles. The interfacial layer was subsequently formed on the basis of the core by using styrene, acrylonitrile and DVB as comonomers. Then the butyl acrylate and styrene were synthesized on the basis of the interface to form the outer layer which is prone to form the film afterwards. Finally, the hollow latex particles were obtained by alkalization treatment of the core-shell particles.The effects of feeding methods, the category and dosage of emulsifiers and crosslinkers, recipe for preparing the outer layer as well as the reaction time and temperature for alkalization treatment on the sizes, distribution and morphologies of particles; stability, film-forming property and hidding power of eumlison were investigated. And the optimal feeding method, recipe and alkalization treatment condition were determined. The morphologies and particle sizes of the hollow latex particles were characterized by TEM, SEM and nanosizer. The film forming property and hidding power of emulsion were investigated by cryptometer. The results show that the latex particles with superior film-forming property and hidding power can be obtained when MAA content is 30 part, using ammonia to take alkalization under pH 9 condition, and the soft/hard monomer ratio of the shell is 4:1.