Method for copolymerizing sulfur-free soap-free in-situ RAFT emulsion to synthesize polymer/pigment hybrid latex
A polymer and copolymerization technology, applied in the field of sulfur-free and soap-free in-situ RAFT emulsion copolymerization into polymer/pigment hybrid latex, which can solve the problem of low coating rate of coated pigments, difficult control of color light, and uncontrollable molecular structure and other problems, to achieve the effect of high pigment coating rate, high dispersion stability and mild conditions
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[0049] Example
[0050] According to the feeding ratios and conditions shown in Table 1 and Table 2, the polymer / organic pigment hybrid latex was prepared, and the steps were as follows:
[0051] 1. Dissolve reactive emulsifier in water, add pigment, and homogenize by ultrasonic to obtain pigment dispersion. The dosage of reactive emulsifier accounts for 5%-10% of monomer. Ultrasonic homogenization temperature is-5 ~ 10℃ and ultrasonic time is 5 ~ 60 min.
[0052] 2. In-situ synthesis of amphiphilic sulfur-free ω-vinyl methacrylate macromolecules RAFT reagent on the surface of pigment particles by catalytic chain transfer polymerization (CCTP) method. The specific experimental steps are as follows: add the catalytic chain transfer reagent and methacrylate monomers into a 100mL round bottom flask with a stirring bar (the catalyst accounts for 80-120ppm of methacrylate monomers), and purge nitrogen for at least one hour, so that the mixture is stirred in nitrogen atmosphere until th...
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