Method for preparing (methyl) acrylate polymer

Abstract

The invention relates to a method for preparing a (methyl) acrylate polymer. In the method, high-temperature continuous bulk polymerization is performed or less than or equal to 5 percent of atent solvent is added so as to perform solution polymerization in a circulating tube type reactor and a straight tube type reactor, and an N-alkyl maleimide monomer and a vinyl monomer are introduced into a (methyl) acrylate monomer and are copolymerized with the (methyl) acrylate monomer so as to prepare the (methyl) acrylate polymer with good heat resistant performance. The method comprises the following steps of: reducing the content of oxygen dissolved in a comonomer to 1 to 3 ppm by nitrogen; supplying the (methyl) acrylate monomer, the N-alkyl maleimide monomer and the vinyl monomer to the circulating tube type reactor continuously, and controlling the conversion rate to be 45 to 60 percent, wherein the polymerization temperature is between 130 and 150 DEG C; and conveying a reaction mixture to the straight tube type reactor continuously, wherein the reaction temperature is controlled to be 140 to 160 DEG C, and the polymerization conversion rate is controlled to be 55 to 90 percent. Bythe method, the glass transition temperature and initial thermal decomposition temperature of the polymer are improved obviously.

Description

technical field

[0001] The invention relates to a method for preparing a (meth)acrylic ester polymer with excellent heat resistance by a continuous high-temperature polymerization method. Background technique

[0002] (Meth) acrylate polymers have excellent optical properties, weather resistance, chemical stability and physical and mechanical properties. This excellent transparent material is widely used in various lighting equipment, optical components, and various instruments and meters. Dials, covers, dials, advertising, aircraft, automobiles and medical fields. Especially in miniaturization in the field of electronic appliances and weight reduction in the automobile industry, (meth)acrylate polymers show many advantages. However, in the process of processing, it often shows the shortcomings of low temperature and poor heat resistance, which limits its processing and use. In order to improve this shortcoming, two approaches are usually adopted. On the one hand, a part ...

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