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Method for preparing (methyl) acrylate polymer

An acrylate and polymer technology, applied in the field of acrylate polymers, can solve the problems of only 90% light transmittance of materials, complicated preparation process, etc., and achieves improved processing flow properties, increased initial thermal decomposition temperature, widened Effects in the processing range and field of application

Active Publication Date: 2012-01-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method is complicated, and the light transmittance of the material is only 90%.

Method used

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  • Method for preparing (methyl) acrylate polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the batching tank with a jacket, the raw materials such as methyl methacrylate, N-isopropylmaleimide, styrene, etc. are mixed, and then sent to the intermediate tank for temporary storage to ensure a constant feed amount. The feed composition of the monomer mixture: based on 100 parts by weight of methyl methacrylate, 3 parts by weight of N-cyclohexylmaleimide, 2 parts by weight of ethyl acrylate, 2 parts by weight of styrene, 0.15 parts by weight of di-tert- Butyl peroxide and 0.2 parts by weight of tert-dodecylmercaptan. Fill the batching tank and intermediate tank with nitrogen, remove the oxygen mixed in the monomer mixed solution, and control the oxygen content therein at 2ppm. The mixed solution of the above raw materials was continuously added to the 20L circulating tubular reactor replaced by nitrogen with a pump. The temperature in the circulating tubular reactor was maintained at 135°C. Until the polymerization conversion rate reaches 43.8%, the polymeriz...

Embodiment 2

[0021] The same equipment and operating method as in Example 1 were used. Adjusted the ratio of N-cyclohexylmaleimide in the copolymerization system, the raw material mixed solution consists of: taking 100 parts by weight of methyl methacrylate as the base, 5 parts by weight of N-cyclohexylmaleimide, 1 Parts by weight of ethyl acrylate, 4 parts by weight of styrene, 5 parts by weight of toluene, 0.15 parts by weight of di-tert-butyl peroxide and 0.2 parts by weight of tert-dodecyl mercaptan. The glass transition temperature and thermal decomposition temperature of the polymer increase with the increase of N-cyclohexylmaleimide content, the glass transition temperature reaches 122.2 ° C, and the thermal decomposition temperature reaches 320.3 ° C when the thermal weight loss is 5%. The product has excellent light transmission and apparent gloss. The polymer test results are listed in Table 1.

Embodiment 3

[0029] The same equipment and operating method as in Example 1 were used. The monomer composition of the polymerization system was adjusted: taking 100 parts by weight of methyl methacrylate as the base, 3 parts by weight of N-isopropylmaleimide, 2 parts by weight of ethyl acrylate, 2 parts by weight of styrene, 0.15 parts by weight of Di-tert-butyl peroxide and 0.2 parts by weight of tert-dodecylmercaptan. The glass transition temperature and thermal decomposition temperature of the polymer increased with the addition of N-isopropylmaleimide, the glass transition temperature reached 116.9°C, and the thermal decomposition temperature reached 318.7°C when the thermal weight loss was 5%. Polymer products have excellent light transmission and apparent gloss. The polymer test results are listed in Table 1.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F222/40C08F212/08C08F220/18C08F2/02C08F2/04
Inventor 赵金德刘哲王硕胡慧林李晶陈继新田月
Owner PETROCHINA CO LTD
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