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Method for preparing high molecular weight modified polymethyl methacrylate

A technology of polymethyl methacrylate and methyl methacrylate, which is applied in the field of preparation of high molecular weight modified polymethyl methacrylate, can solve the problems of small molecular weight and the like, and achieves improved molecular weight, simple operation and high polymerization rate. Effect

Inactive Publication Date: 2015-09-23
SUZHOU DOUBLE ELEPHANT OPTICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of small molecular weight when synthesizing polymethyl methacrylate with methacrylic acid as a monomer in the prior art, and to provide a simple and easy-to-operate high molecular weight modified polymethyl methacrylate Preparation method of ester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a 250mL flask equipped with a reflux condenser, add monomers 190g methyl methacrylate and 10g butyl acrylate, 0.002g initiator peroxy-2-ethylhexanoic acid tert-butyl ester and 0.5g chain transfer agent n-octyl Mercaptan; Stir to mix evenly, heat the oil bath to 100°C; control the stirring speed to 300r / min, when the viscosity of the polymerization system increases, increase the stirring speed to 400r / min, and react at constant temperature for 9h40min to form a viscous shape The copolymerization product; stop the reaction, let it stand, after the system cools down, smash the flask to take out the copolymerization product, dissolve it completely with acetone, then settle the copolymer with methanol, filter, and then place it in an oven for drying at 60°C , dried for 8 hours, and ground to obtain fine granular high-molecular-weight modified polymethyl methacrylate products.

Embodiment 2

[0019] In a 250mL flask equipped with a reflux condensing device, add monomer 160g methyl methacrylate and 60g ethyl acrylate, 0.01g initiator peroxyacetic acid tert-butyl ester and 1.0g chain transfer agent n-butyl mercaptan; stir to make Mix evenly, heat the oil bath to 95°C; control the stirring speed to 300r / min, when the viscosity of the polymerization system increases, increase the stirring speed to 400r / min appropriately, and react at constant temperature for 6h40min to form a viscous copolymerization product; stop the reaction , stand still, after the system is cooled, smash the flask to take out the copolymerization product, dissolve it completely with acetone, then settle the copolymer with methanol, filter, and then put it in an oven for drying, the drying temperature is 80°C, and the drying time is 4h , and ground to obtain a fine granular high molecular weight modified polymethyl methacrylate product.

Embodiment 3

[0021] In the 250mL flask that reflux condenser is housed, add monomer 200g methyl methacrylate and 10g methyl acrylate, 0.03g initiator peroxybenzoic acid tert-butyl and 0.8g chain transfer agent n-octyl mercaptan; Stir to make Mix evenly, heat the oil bath to 110°C; control the stirring speed to 300r / min, when the viscosity of the polymerization system increases, increase the stirring speed to 400r / min appropriately, and react at constant temperature for 5h50min to form a viscous copolymerization product; stop React, stand still, after the system cools down, smash the flask to take out the copolymerization product, dissolve it completely with acetone, then settle out the copolymer with methanol, filter, and then put it in an oven for drying, the drying temperature is 90 °C, and the drying time is After 4 hours, it was ground to obtain a high molecular weight modified polymethyl methacrylate product in the form of fine particles.

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Abstract

The invention relates to a method for preparing high molecular weight modified polymethyl methacrylate. The method includes the steps that firstly, the raw materials of 80-100 parts of monomer methyl methacrylate, 5-30 parts of copolymerization modified monomer, 10*10-4-150*10-4 parts of initiator and 0.1-0.5 part of chain transfer agent are taken and fully stirred so that the raw materials can be mixed evenly; the mixture is put into a reactor provided with a backflow condensing device, oil bath heating and temperature rising are conducted, the reaction temperature is controlled to range from 80 DEG C to 150 DEG C, a stirring reaction is conducted for 6-10 h under the rotating speed of 300-500 r / min, a viscous copolymerization product is formed, and finally the modified polymethyl methacrylate is prepared after aftertreatment. According to the method, polymerization is conducted in a one-time feeding mode, operation is simple, the polymerization reaction is easy to control, the polymerization rate is high, and the prepared polymer has high molecular weight.

Description

technical field [0001] The invention relates to a preparation method of high molecular weight modified polymethyl methacrylate, belonging to the technical field of polymer preparation. Background technique [0002] Polymethyl methacrylate, English abbreviation PMMA. PMMA has good light transmission, electrical insulation, chemical resistance, solvent resistance, weather resistance and certain heat and cold resistance. After post-processing, it can be applied to liquid crystal light guide plate film, LED lamps, optical fiber materials, Optical products, auto parts, home appliance parts, and daily necessities. [0003] The polymer polymethyl methacrylate synthesized from methyl methacrylate as a monomer, its molecular weight has an important influence on the properties of polymer materials, and is one of the main factors restricting its application performance. Polymethyl methacrylate is generally obtained by free radical bulk polymerization of methyl methacrylate monomers, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F2/38
Inventor 沈斌君孔德成李国芳沈伟
Owner SUZHOU DOUBLE ELEPHANT OPTICAL MATERIALS CO LTD
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