Dispersing agent for polymer polyol and preparation method of polymer polyol

Abstract

The invention discloses a dispersing agent for polymer polyol and a preparation method of the polymer polyol. The dispersing agent is a copolymer macromolecule which is prepared from epoxypropane andethylene oxide and has an average molecular weight of 6000 to 20000, and each molecule of the dispersing agent at least contains a rigid benzene ring and a polymerizable carbon-carbon double-bond or triple-bond polymer. The preparation method of the dispersing agent comprises the following steps: synthesizing basic polyether polyol, introducing cyclic dicarboxylic acid anhydride into the polyetherpolyol, reacting the polyether polyol with an epoxy compound having polymerizable double bonds, and carrying out terminating with epoxide to obtain the dispersing agent. The polymer polyol is prepared from basic polyether polyol, unsaturated vinyl monomer styrene and acrylonitrile, a polymerization initiator, the dispersing agent and an optional chain transfer agent, wherein the basic polyether polyol is polyether polyol having a functionality of 3 to 8. The dispersing agent prepared in the invention is stable, colorless and transparent; and the polymer polyol prepared from the dispersing agent has relatively low viscosity, fine particles, high whiteness and good water solubility.

Description

technical field [0001] The invention relates to the technical field of preparation or chemical processing of organic polymer compounds, in particular to a dispersant for polymer polyol and a preparation method of polymer polyol. Background technique [0002] Polymer polyol (POP) is based on polyether polyol, in situ polymerization of alkenyl-containing monomers initiated by free radical initiators, to generate grafted polyether polyols containing solid particles. The polyol contains hydroxyl groups, and the tiny particles formed by styrene or acrylonitrile polymers on the side chains can be used for polyurethane foaming and make the foam have better bearing capacity. raw material. Adding polymer polyols to the formula for making foam can improve the load-carrying capacity of the foam and improve the processing technology of particle reinforcement materials. The polymer ultra-fine particles dispersed and filled act as active fillers for the polyurethane matrix, which can imp...

AI Technical Summary

Problems solved by technology

Such as: US 4652589 describes a polyether polyol with a molecular weight of 12000 made by polymerizing sorbitol as an initiator with propylene oxide (PO) and ethylene oxide (EO), and reacting with maleic anhydride to introduce The double bond is terminated with EO to make a macromonomer, but this kind of macromonomer has a deep color, mostly dark yellow, and has a high viscosity, which is inconvenient to use

In WO1999040144, sorbitol polyether is reacted with phthalic anhydride, and then reacted with glycidyl methacrylate to make a macromonomer. The macromonomer synthesized by this method has a low viscosity, but the synthesized polymer polyol The viscosity is high and the particles are average; in WO 2014055282, polyether polyols with a molecular weight of 12,000 and 3-isopropyl-dimethylbenzyl isocyanate (TMI) prepared by polymerizing sorbitol initiators with PO and EO are used for coupling The polyether polyol of 12000 molecular weights and 3-isopropyl-dimethylbenzyl isocyanate (TMI) are carried out by reacting to make macromolecular monomer and US20060025491 with MDI sorbitol initiator and PO, EO polymerization to make Coupling to make macromolecules, and then use two-stage continuous reaction to make prefabricated stabilizers for the synthesis of polymer polyols. The macromonomers synthesized by this method have relatively low viscosity and good color, and the viscosity of synthetic polymer polyols Generally, and the macromonomer is turbid, prone to self-polymerization

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