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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

Active Publication Date: 2020-12-11
ZHEJIANG SCI-TECH UNIV
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Problems solved by technology

[0019] The technical problem to be solved by the present invention is to provide a preparation method for polymer / pigment hybrid latex by copolymerization of sulfur-free and soap-free in-situ RAFT emulsion, so as to solve the problems caused by polymers prepared by traditional sulfur-containing RAFT reagents when coating organic pigment particles. It is difficult to control the shade of the pigment, and more importantly, it is to solve the problems of low coating rate and uncontrollable molecular structure of multifunctional polymer-coated pigments.

Method used

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  • Method for copolymerizing sulfur-free soap-free in-situ RAFT emulsion to synthesize polymer/pigment hybrid latex
  • Method for copolymerizing sulfur-free soap-free in-situ RAFT emulsion to synthesize polymer/pigment hybrid latex
  • Method for copolymerizing sulfur-free soap-free in-situ RAFT emulsion to synthesize polymer/pigment hybrid latex

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Embodiment

[0050] According to table 1, feed ratio and condition shown in table 2, prepare polymer / organic pigment hybrid latex, the steps are as follows:

[0051] 1. Dissolve the reactive emulsifier in water, add the pigment, and homogenize it by ultrasonic to obtain the pigment dispersion liquid. The amount of the reactive emulsifier accounts for 5%-10% of the monomer. The ultrasonic homogenization temperature is -5-10°C, and the ultrasonic time is 5-60 minutes.

[0052] 2. Using the catalytic chain transfer polymerization (CCTP) method to in-situ synthesize the amphiphilic sulfur-free ω-vinyl methacrylate macromolecular RAFT reagent on the surface of the pigment particles, the specific experimental steps are as follows: the catalytic chain transfer reagent and formazan methacrylate monomer was added to a 100 mL round bottom flask with a stir bar (80-120 ppm catalyst based on methacrylate monomer) and nitrogen was purged for at least 1 hour, allowing the mixture to stir under nitrogen ...

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Abstract

The invention relates to a method for copolymerizing sulfur-free soap-free in-situ RAFT emulsion to synthesize polymer / pigment hybrid latex, which comprises the following steps: dispersing a pigment by using a reactive emulsifier to prepare a pigment dispersion liquid; synthesizing the amphiphilic sulfur-free omega vinyl methacrylate macromolecular RAFT reagent in situ on the surfaces of pigment particles by adopting a catalytic chain transfer polymerization method; dropwise adding an acrylate monomer, carrying out in-situ sulfur-free RAFT polymerization on the surfaces of pigment particles byvirtue of an RAFT reagent, and regulating and controlling the structure and composition of a coating layer polymer, so as to obtain a series of polymer / organic pigment hybrid latex which is uniformlycoated and stably dispersed. The hybrid latex prepared by copolymerization of the sulfur-free soap-free in-situ RAFT emulsion has the characteristics of high dispersion stability, high pigment coating rate, clear coating polymer layer sequence, controllable structure and the like, and is suitable for surface coating modification of various pigments.

Description

technical field [0001] The invention relates to the technical field of capsule pigment coatings in fine chemical industry, in particular to a method for synthesizing polymer / pigment hybrid latex by copolymerization of sulfur-free and soap-free in-situ RAFT emulsions. Background technique [0002] Organic pigments have the advantages of many varieties, complete color spectrum, bright colors, and strong durability. They are widely used in industrial fields such as ink printing, coatings, plastics, and rubber, and become indispensable coloring materials for the production of various industrial products. For example, the digital inkjet printing of textiles and the inkjet printing technology of organic pigment ink have the characteristics of energy saving, water saving and less pollution, and are an environmentally friendly new technology of clean coloring. [0003] Pigments are insoluble in water and are dispersed in water in the form of particles during use. The stability of th...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F2/38C08F2/22
CPCC08F293/005C08F2/38C08F2/22C08F2438/03
Inventor 戚栋明汪芬萍李家炜赵磊何贵平
Owner ZHEJIANG SCI-TECH UNIV
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