Method for micro-suspension polymerization preparation of sub-micron polyurethane-modified polyacrylate copolymerized latex

Abstract

The invention discloses a method for micro-suspension polymerization preparation of a sub-micron polyurethane-modified polyacrylate copolymerized latex. The method comprises the steps: adding an isocyanate monomer and polyhydric alcohol into an acrylate monomer containing an auxiliary emulsifier cetane, adding a catalyst dibutyl lithium dilaurate, heating up, carrying out a prepolymerization reaction for 20-40 min, adding 2,2-dihydroxy propionic acid, carrying out a chain extension reaction, finally adding an end-capping agent, and thus obtaining an oily monomer mixed solution; adding an initiator azobisisobutyronitrile into the oily monomer mixed solution, then pouring into a dispersant polyvinyl alcohol aqueous solution, and carrying out ultrasonic micro-suspension emulsification; heating the micro-suspension liquid up to 60 DEG C-90 DEG C, carrying out a reaction for 4 h-8 h, dropping the temperature and cooling, and thus obtaining an emulsion. The copolymerized emulsion prepared by the method has the advantages of high solid content, good film-forming property, simple preparation process, and easy implementation, can be used for a water-based latex adhesive, and is used in coating, printing and dyeing, papermaking, printing ink and other fields.

Description

technical field [0001] The invention relates to the field of modification and preparation of polyacrylate latex, in particular to a method for preparing submicron polyurethane-modified polyacrylate copolymer latex by microsuspension polymerization. Background technique [0002] Acrylic polymer (PA) has good properties such as good aging resistance and light resistance, and is widely used as a coating film-forming agent, textile printing and dyeing adhesive, daily chemical industry, functional film, medical polymer and water treatment, etc. . However, acrylate polymers also have disadvantages such as poor water resistance, insufficient moisture permeability, easy to become brittle at low temperature, and easy to become viscous and lose strength at high temperature, which restricts its application in more fields. [0003] Polyurethane resin products (PU) have many advantages such as excellent wear resistance, weather resistance, chemical resistance, high temperature resistanc...

AI Technical Summary

Problems solved by technology

Through miniemulsion polymerization, although latex particles with a higher degree of modification can be obtained, the particle size of the obtained copolymerized latex is less than 500nm, and the solid content of the final product is generally low. In order to improve the stability of submicron monomer droplets, it is necessary to Need to bring in a lot of harmful co-emulsifiers

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