Conventional Emulsion Polymerization

The composite particles with high silicon content [m (organosilicon): m (acrylate)=76] core/shell structure were synthesized, and the effect of polymerization process on the particle size distribution and morphology of lotion was studied. The results showed that the composite emulsifier with m (sodium dodecyl sulfate): m (polyethylene glycol octyl phenyl acyl)=1: 1 could obtain a silicone acrylic lotion with small particle size (100nm) and narrow distribution. With the increase of emulsifier concentration, the particle size of lotion became smaller, Increased monomer conversion rate; The nucleation mechanism of the composite lotion was also discussed. MMA monomer dropped slowly, and the seeds were in a "hungry" state. MMA was adsorbed to its surface by a large number of seed latex particles, and copolymerized with the alkenyl group in polysiloxane. The reaction was limited to the "transition layer" on the surface of the latex particles. Due to the poor compatibility between PMMA and polysiloxane, the subsequent MMA monomer enriched on the "transition layer" surface, and then formed the shell acrylate, The microphase separation that generates composite particles ultimately forms a core/shell structure.

The latex particles obtained by conventional lotion polymerization are homogeneous, and the latex particles obtained by shell/core lotion polymerization are heterogeneous. Prepared a copolymer lotion with polyacrylate (core)/polysiloxane (shell) latex particles by means of simultaneous polycondensation and free radical copolymerization. Due to the lower hydrophilicity and surface free energy of polysiloxane compared to polyacrylate, this structure increases the interfacial tension between water and polymer, resulting in an increase in Gibbs free energy. Therefore, this colloidal structure is thermodynamically unstable; After the lotion (siloxane mass fraction is 20%) was placed for 54 days, the Morphogenesis of the latex particles changed into a relatively stable structure of polysiloxane burning (core)/polyacrylate (shell) thermodynamics, and the siloxane mass fraction in the polymer increased, while the phase inversion time was shortened.

The lotion particles with shell/core structure were prepared. The core composed of polysiloxane, polyacrylate and styrene polymer was synthesized by two-step swelling method. The organosilicon acrylate polymer with styrene and acrylate polymer as the shell was synthesized by grafting outside the core. The polymer has excellent coloring, collision resistance and other properties, and is widely used in electronic product coatings.

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