METHOD FOR SULPHUR-FREE SOAP-FREE IN-SITU RAFT EMULSION COPOLYMERISATION OF POLYMER/PIGMENT HYBRID LATEX

摘要

The present invention relates to a method for sulphur-free soap-free in-situ RAFT emulsion copolymerisation of polymer/pigment hybrid latex, comprising the following steps: selecting a reactive emulsifier to disperse a pigment to prepare a pigment dispersion; using a catalytic chain transfer polymerisation method to synthesise an amphiphilic sulphur-free terminal ω-vinyl methacrylate macromolecular RAFT reagent in situ on the surface of the pigment particles; dropwise adding an acrylate monomer, performing in-situ sulphur-free RAFT polymerisation on the surface of the pigment particles by means of the RAFT reagent, and adjusting the structure and the composition of the coating layer polymer to acquire a series of uniformly coated and stably dispersed polymer/organic pigment hybrid latexes. The hybrid latex prepared by means of the sulphur-free soap-free in-situ RAFT emulsion copolymerisation of the present invention has high dispersion stability, high pigment coating rate, clear coating polymer layer sequence, and a controllable structure, and is suitable for surface coating modification of various pigments.