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Preparation method of (methyl) acrylic polymer

A technology of methyl methacrylate and methacrylic acid, which is applied in the field of continuous bulk polymerization to prepare acrylate polymers, which can solve the problems of polymer transparency, heat resistance degradation, and influence on polymer color, etc.

Active Publication Date: 2011-09-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The residual initiator will continue to initiate the polymerization reaction during the devolatilization process, and generate a large number of dimers. The increase of the dimer will lead to the decrease of the transparency and heat resistance of the polymer, and affect the color of the polymer.

Method used

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  • Preparation method of (methyl) acrylic polymer

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In the batching tank with a jacket, the raw materials such as methyl methacrylate, styrene and tert-dodecyl mercaptan are initially mixed, and then sent to the intermediate tank for temporary storage to ensure a fixed feed amount. The polymerized monomer mixed solution was kept at 10°C. The composition of the mixed solution is: 95 parts of methyl methacrylate, 5 parts of styrene and 0.05 part of tert-dodecyl mercaptan (corresponding to the total amount of polymerized monomers). Fill the batching tank and the intermediate tank with nitrogen (by nitrogen system), remove the oxygen mixed in the monomer mixed solution, and control the oxygen content therein at 2ppm. The reactor is also replaced with nitrogen to exhaust oxygen before feeding monomer. The monomer is fed into the circulation tube reactor at a rate of 1.2kg / h through the metering pump, and the material circulates in the reactor through the circulation pump, and the ratio of the material circulation rate to the...

Embodiment 2

[0029] The same procedure as in Example 1 was used except that the ratio of polymerized monomers and the ratio of recycle to feed rate were adjusted. The composition of the mixed solution was: 90 parts of methyl methacrylate, 10 parts of styrene and 0.05 part of t-dodecyl mercaptan. In the circulating tubular reactor, the ratio of the material circulation rate to the feed rate is controlled to be 40:1, and the polymerization temperature is 150°C. The polymerization conversions in the circulation tube reactor and the straight tube reactor were 47.3% and 77.1%, respectively. After the reaction is complete, the polymer mixture is sent to a vented extruder for devolatilization. Polymerization conditions and test results are listed in Table 1. Under this condition, the continuous polymerization process and devolatilization process of the system can be stably controlled, and a colorless and transparent polymer with excellent performance is obtained.

Embodiment 3

[0031] The same method as in Example 1 was used, except that the polymerization temperature of the system was lowered. 95 parts of methyl methacrylate, 5 parts of styrene and 0.05 parts of tert-dodecyl mercaptan are passed through nitrogen to remove dissolved oxygen in the monomer, and then sent to a circulating tubular reactor. The polymerization temperature is 140°C. In the circulating tubular reactor, the ratio of material circulation rate to feed rate is controlled to be 80:1. The polymerization conversions in the circulating tube reactor and the straight tube reactor were 38.1% and 58.7%, respectively. After the reaction is complete, the polymer mixture is sent to a vented extruder for devolatilization. Polymerization conditions and test results are listed in Table 1. Under this condition, the continuous polymerization process and devolatilization process of the system can be stably controlled, and a colorless and transparent polymer with excellent performance is obtain...

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Abstract

The invention relates to a preparation method of (methyl) acrylic polymer, comprising the following steps of: adopting a serial circulating pipe type reactor, a straight pipe type reactor and a vented-type extruder, and / or adding styrene monomer to initiate the polymerization of (methyl) acrylic monomer to obtain (methyl) acrylic acid methyl ester homopolymer, copolymer containing (methyl) acrylic acid methyl ester and (methyl) acrylic acid alkyl ester or (methyl) acrylic acid alkyl ester homopolymer; wherein in the circulating pipe type reactor, the polymerization temperature is 140-160 DEG C, the material circulating velocity is 30-100 times of the feeding velocity, and the polymer content is controlled to 35-50 percent; in the straight pipe type reactor, the polymer content is controlled within the range of 40-80 percent; and in the vented extruder, volatile substances are removed at the temperature of 200-240 DEG C and the pressure of 50-300mmHg. The preparation method can controlthe continuous polymerization process and the devolatilization of the system stably and prepares the polymer which is excellent in performance, colorless and transparent and has the light transmittance up to 90-92 percent.

Description

Technical field: [0001] The invention relates to a method for preparing (meth)acrylic ester polymers by a continuous bulk polymerization method, through which pure (meth)acrylic ester molding compound products can be stably prepared. Background technique: [0002] (Meth) acrylate polymer (mostly called PMMA) is widely used as a transparent material with excellent performance in various lighting equipment, optical components, various instrument dials, covers, dials, commercial advertising windows, billboards , aircraft cockpit glass, bulletproof glass for aircraft and automobiles, various medical and military glass and other fields. In recent years, in addition to being widely used in the above fields instead of glass, various special PMMAs have been used more and more in the fields of medicine, building profiles, communications, electronic appliances, etc., and have become a hot spot for investment. [0003] In the polymerization process, although the suspension polymerizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/10C08F212/08C08F2/02C08F2/01
Inventor 王硕张会轩刘哲赵金德李晶陈继新谭志勇胡慧林张春英赵亮高延成
Owner PETROCHINA CO LTD
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