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Preparation method for polymethyl methacrylate resin with high heat resistance

A polymethyl methacrylate, high heat resistance technology, applied in the field of polymer material preparation, can solve the problems of complex post-treatment process, toxic product properties of solvents, etc., and achieve shortened polymerization reaction time, good performance, and excellent heat resistance. and thermal stability

Active Publication Date: 2015-05-27
CHANGCHUN UNIV OF TECH
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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 provide a preparation method of high heat-resistant polymethyl methacrylate resin in order to solve the problems of complex post-treatment process, toxic solvent and poor product performance in the existing preparation method of polymethyl methacrylate resin. method

Method used

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  • Preparation method for polymethyl methacrylate resin with high heat resistance
  • Preparation method for polymethyl methacrylate resin with high heat resistance
  • Preparation method for polymethyl methacrylate resin with high heat resistance

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preparation example Construction

[0020] A kind of preparation method of high heat-resistant polymethyl methacrylate resin provided by the invention adopts continuous solution polymerization, comprising:

[0021] Step 1: Mix methyl methacrylate, acrylamide monomer, solvent, initiator and chain transfer agent to form a mixed solution, continuously inject the mixed solution into the reaction kettle through the feeding pump, and carry out polymerization at 100-160°C React for 3 to 4 hours to obtain a reaction mixture;

[0022] Step 2: Start the discharge melt pump and the devolatilization extruder, enter the reaction mixture obtained in step 1 from the reaction kettle through the discharge melt pump into the devolatilization extruder for devolatilization, and start the feeding pump at the same time to adjust The amount of feed and the amount of output are kept consistent to obtain the polymethyl methacrylate resin.

[0023] According to the present invention, methyl methacrylate, acrylamide monomer, solvent, ini...

Embodiment 1

[0033] 90 parts by weight of monomer I methyl methacrylate, 10 parts by weight of monomer II methacrylamide, 20×10 -6 The initiator AIBME of parts by weight, the solvent ethanol that does not add chain transfer agent and 20 parts by weight are made into 6kg solution through metering pump and join polymerization reactor, and feed nitrogen in the polymerization kettle in order to get rid of dissolved oxygen and The air in the reaction kettle was removed, then the stirring paddle and the built-in gas phase condenser were opened, and heated in an oil bath, and reacted at 100°C for 3 hours to obtain a reaction mixture;

[0034] Start the discharge melt pump and the devolatilization extruder, the reaction mixture obtained enters the devolatilization extruder from the reaction kettle through the discharge melt pump at 6kg / hr and carries out devolatilization 2min, and starts the feed pump simultaneously, adjusts The amount of feed and the amount of output, so that the feed rate and ou...

Embodiment 2

[0036] 85 parts by weight of monomer I methyl methacrylate, 15 parts by weight of monomer II methacrylamide, 30×10 -6 Initiator AIBN, chain transfer agent normal dodecyl mercaptan 20 * 10 parts by weight -6 and 20 parts by weight of solvent ethanol are made into 6kg solution and added to the polymerization reactor through a metering pump, and nitrogen gas is passed into the polymerization reactor to get rid of the dissolved oxygen in the mixed material and the air in the reactor, and then the stirring paddle, the built-in The gas phase condenser was opened, heated in an oil bath, and reacted at 110°C for 3 hours to obtain a reaction mixture;

[0037] Start the discharge melt pump and the devolatilization extruder, the reaction mixture obtained enters the devolatilization extruder from the reaction kettle through the discharge melt pump at 6kg / hr and carries out devolatilization 2min, and starts the feed pump simultaneously, adjusts The amount of feed and the amount of output,...

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Abstract

The invention provides a preparation method for polymethyl methacrylate resin with high heat resistance, and belongs to the field of high polymer material preparation methods. The preparation method is used for solving the problems that an existing preparation method for the polymethyl methacrylate resin is complex in post-treatment process, the solvent is toxic and the product performances are poor. According to the preparation method disclosed by the invention, continuous solution polymerization is adopted, alcohol is taken as a solvent, monomer with reactive hydrogen and methyl methacrylate are polymerized into binary copolymer at a high temperature, and a purpose of improving the heat resistance of the polymethyl methacrylate resin is improved by controlling a ratio of charge and a polymerization temperature of the polymethyl methacrylate monomer and the acrylamide monomer. According to the experimental results, the glass transition temperature Tg of the polymethyl methacrylate resin prepared by the preparation method can reach 173 DEG C, the thermal degradation initial temperature is over 301 DEG C, the obvious thermal degradation temperature is up to 401 DEG C and the molecular weight distribution is about 1.5.

Description

technical field [0001] The invention belongs to the field of preparation methods of polymer materials, and in particular relates to a preparation method of high heat-resistant polymethyl methacrylate resin. Background technique [0002] Polymethyl methacrylate (PMMA), an acrylic polymer, has many excellent properties, such as: high light transmission, light weight, easy processing, dimensional stability, weather resistance, electrical insulation Good, and not easy to color, etc.; therefore, widely used in aviation, construction, decoration, optical instruments and other fields. However, the glass transition temperature of radically polymerized PMMA is low, only 105°C, and thermal degradation usually starts at 150°C. This makes the polymer not only susceptible to thermal degradation during production and processing, but also easily deformed during use, which seriously limits its application range. Usually, a ring structure is introduced into the main chain and side chain of...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/54C08F220/60C08F220/14C08F2/06
Inventor 曹春雷刘捷谭志勇张会轩
Owner CHANGCHUN UNIV OF TECH
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