Polymerization of Organosilicon Oligomers

In the 1990s, silane coupling agent modified acrylate monomers became a new hotspot in the synthesis of silicone acrylic lotion. Under the condition of the existence of initiator, free radical polymerization was carried out with silicone monomers containing double bonds (silicone coupling agent) or silicone oligomers and acrylate monomers to obtain a structurally stable silicone modified acrylate lotion. The copolymer lotion has uniform particle size distribution and good film forming property. The seed lotion polymerization of y-methacryloxypropyl Trimethoxysilane with acrylate monomers was carried out. The particle size of the polymerization process was tracked by PCS. The results showed that with the increase of the amount of silicone, the polymerization stability of the lotion became worse, the average particle size of the latex particles increased, and the viscosity of the lotion increased. Under the condition of using di tert butyl peroxide as initiator, the organosilicon monomer Y-methacryloxypropyl Trimethoxysilane or Y-methacryloxypropyl methyl Methoxy group silane containing unsaturated double bonds was copolymerized with acrylate monomers, and a silicone acrylic resin coating with good film performance was obtained.

The alkenylsilane coupling agent is easy to hydrolyze into active silanol during lotion polymerization, and then self polycondensation and cross-linking to form agglomerate, which makes it difficult to polymerize with acrylate monomers. It is proposed that the methoxy group in y-methacryloyloxy Trimethoxysilane with faster hydrolysis rate is replaced by ethoxy or isopropoxy group with slower hydrolysis rate by alcoholysis reaction, Then, using oxygen burning groups with large steric hindrance, such as OCH type pressure or CH (CH), to replace OCH3 in y-methacryloyloxypropyl Trimethoxysilane, the hydrolysis of alkenylsilane is inhibited, the hydrolysis rate is reduced, and a new high-performance silicone acrylic composite lotion with high silane content is synthesized. The research shows that the modified product of ethoxysilicone monomer shows good mechanical properties and strong water resistance after film forming and curing.

Another type of organosilicon oligomer containing unsaturated double bonds, For example, octamethylcyclotetrasiloxane (D center, the organosilicon macromonomer with double bonds is prepared through ring opening reaction, and then copolymerized with acrylate to bond the organosilicon macromolecule to acrylate. Under the condition of persulfuric acid as initiator, the organosilicon monomer generated in 1 liter of D is used to modify the mixed monomer of Methyl methacrylate, Butyl methacrylate and acrylic acid, and the dosage, reaction temperature, pre emulsification process and other conditions are studied to modify the lotion The impact of performance. The water resistance and tensile strength of the polymerized lotion were improved after testing. Xia Yuzheng et al. modified acrylate with α - methacryloxypropyl Trimethoxysilane and octamethylcyclotetrasiloxane, discussed the influence of solid content, silicone content, polymerization temperature, emulsifier type and other conditions on the rheological properties of lotion, and prepared silicone acrylic lotion with excellent performance.

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