Preparation method of crosslinkable block-grafted type high-molecular polymer

Abstract

The invention discloses a preparation method of a crosslinkable block-grafted type high-molecular polymer. At present, the wide application of some polyurethane amphiphilic polymers in the fields of emulsion polymerization, pigment dispersion and the like is restricted due to limitation of the spatial topology structures of the hydrophilic chain segment and the oleophylic chain segment of the polyurethane amphiphilic polymer. Glycerin monostearate and polyisocyanate are used as raw materials and react with a mixed polyol of trimethylol propane poly(ethylene glycol) monomethyl ether and other polyols, finally chain extension, end sealing, emulsification, distillation and the like are performed to generate the crosslinkable block-grafted type high-molecular polymer. The special block-grafted structure of the polymer enables the polymer to have good surface activity, and the active groups in their structures are coordinated, so that the crosslinkable block-grafted type high-molecular polymer has a good application prospect in the fields of pigment dispersants, stabilizing agents, emulsion polymerization and the like; meanwhile a large amount of active groups are reserved on the polymer, and can be cross-linked with hydroxyl, amino or themselves during heating, and thus the polymer film has good water resistance, adhesive force and bonding strength.

Description

technical field

[0001] The present invention relates to the field of macromolecular chemistry, in particular to a method for preparing a crosslinkable block-graft type polyurethane macromolecular polymer which has good application prospects in the fields of pigment dispersants, stabilizers and emulsion polymerization. . Background technique

[0002] Water-based polyurethane (WPU) is a binary colloid system with water as the dispersion medium. Compared with solvent-based polyurethane, it has the advantages of non-combustibility, low odor, no pollution to the environment, energy saving, and convenient operation and processing. Therefore, it has attracted more and more attention. Note that it has gradually been applied in the fields of dispersants and emulsion polymerization. On the one hand, water-based polyurethane contains a large number of active groups such as isocyanate groups and hydroxyl groups, which can combine with hydroxyl groups and amino groups on fabrics or dyes...

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