Functional segmented copolymer based on living polymerization as well as preparation method and application of copolymer

Abstract

The invention relates to a functional segmented copolymer based on living polymerization. The functional segmented copolymer has a structural formula as shown in the specification, wherein a segment A is prepared by polymerizing at least two olefinic bond unsaturated monomer segments; A1 is a polar olefinic bond unsaturated monomer with an amino functional group, an acid functional group or methacrylic acid glycidyl ester; A2 is a copolymerization prompting monomer; a segment B is prepared by polymerizing at least one or more than one olefinic bond unsaturated monomers; x, y and z are the polymerization degrees; z ranges from 0 to 400; the number-average molecular weight of the segment A is 500-50000; the number-average molecular weight of the segment B is 1000-20000. By introducing the copolymerization prompting monomer A2, the defects in preparing the conventional segmented active copolymer are avoided, not only can the functional segmented copolymer prepared in an ordinary solvent, but also the compatibility of a dispersing agent and a substrate of the functional segmented copolymer is greatly improved, and the functional segmented copolymer is good in dispersion effect for carbon black, organic dye and the like, low in color paste velocity, good in paint film color showing, and particularly high in blackness of the carbon black.

Description

technical field [0001] The invention relates to a functional polymer based on active polymerization, which is an AB block copolymer prepared by active polymerization and used for dispersion of carbon black, organic pigments and the like. Background technique [0002] The dispersant is a surfactant polymer, and part of its structure has a more polar anchoring end group, which is easily adsorbed on the surface of the pigment, and the other part is a solvated long molecular chain with a lower polarity, which is compatible with the dispersed phase ( Resin and solvent) have better affinity. Therefore, the dispersant can uniformly disperse solid particles of inorganic and organic pigments that are difficult to dissolve in liquid, and at the same time prevent the sedimentation and aggregation of solid particles to form a stable suspension. [0003] With the widespread use of organic pigments and carbon black in coatings, inks and plastics, high molecular weight dispersants have be...

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Problems solved by technology

[0005] The structures of the above-mentioned polymers are all block copolymers, and the polar segment as the anchoring end group is a single homopolymer. Although this homopolymeric structure can improve the anchoring efficiency of the dispersant, there are two following Problem: First, if the bulk polymerization method is used, the heat generation of the polymerization will be too severe, and the controllability of the reaction will become poor. If the solvent method is used to prepare, then a strong polar solvent needs to be introduced to better dissolve the polar monomers for polymerization , after the reaction, the polar solvent needs to be removed, otherwise the block copolymer cannot adapt to some coatings and ink systems, resulting in cumbersome production process and increased cost; The group is too concentrated, so there is a certain selectivity for the applied system. In some low-polarity systems, there is a problem of poor compatibility, which leads to the application of this type of polymer is very selective, and the versatility is not wide enough.

[0006] CN101535358 describes a mixture based on a structured copolymer as a wetting agent and a dispersing agent. Gradient copolymers with different molecular weight distributions have been prepared by two different controllable polymerization techniques. The wetting and dispersing agent has a relatively wide compatibility However, the copolymer based on this gradient copolymerization method cannot achieve the best effect on the viscosity reduction behavior of the pigment paste and the anchoring efficiency.

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