Polyacrylate-urethane copolymer and preparation method thereof

Abstract

The invention relates to a polyacrylate-urethane copolymer which has a structural formula shown in the specification of the inveniton, wherein n=3-200, carbon atom number of R1 is less than 25, and R' is polyacrylate. A preparation method comprises the steps of: firstly, preparing polyacrylate with one linear or branched end of Br and the other end of hydroxyl, wherein the polyacrylate has molecular weight of 500-10000 and narrower molecular weight distribution, carrying out nucleophilic substitution on terminal bromine of the polyacrylate by N-methyl ethanolamine to obtain hydroxyl terminated polyacrylate; and then reacting the hydroxyl terminated polyacrylate R(HO)n used as raw materials with isocyanates R1(OCN)n in the presence of a given quantity of solvent or in absence of solvent at a certain temperature under the condition of adding a given quantity of catalyst or no catalyst to prepare the novel polyacrylate-urethane copolymer with molecular weight of above 8000 and molecular main chain containing acrylate and urethane structures. The copolymer has better dissolubility, mechanical behavior, adhesive property and thermostabilization, and has respective advantages of the acrylate and the polyurethane.

Description

technical field The invention belongs to the field of chemical materials and relates to the preparation of acrylate-urethane copolymers containing acrylate and urethane structures in the main chain by using hydroxyl-terminated polyacrylate polymers synthesized by atom transfer radical polymerization (ATRP) as raw materials. Background technique Polyurethane has good physical and mechanical properties, excellent cold resistance, elasticity, high gloss, adjustable polymer hardness, and resistance to organic solvents. It is widely used in automobiles, construction, machinery, light industry, medical equipment, and safety protection. and aerospace fields. However, polyurethane resin has disadvantages such as relatively high price and poor aging resistance. Acrylic resin has the advantages of high mechanical strength, aging resistance, light resistance and non-yellowing, and good water resistance, but has disadvantages such as poor resistance to organic solvents, stickiness at h...

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Problems solved by technology

At present, there are no relevant reports at home and abroad on the research of polyurethane synthesis with hydroxyl-terminated polyacrylate prepared by ATRP method as raw material.

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