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Production process of polymethyl methacrylate (PMMA) through double-initiated polymerization

A production process and initiator technology, which is applied in the field of polymer preparation, can solve problems such as low polymerization rate, low energy and equipment utilization, and potential safety hazards, and achieve the effect of increasing the polymerization rate

Active Publication Date: 2013-06-12
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] At present, there are two main types of PMMA continuous bulk polymerization production: single-pot type, in which monomers, initiators, chain transfer agents and other additives are put into the pot, and after a certain residence time, it enters the subsequent devolatilization and product stage , the defect of this method is that the polymerization rate is low, generally not more than 50%, in order to ensure product quality, the requirements for monomer removal equipment are very high, and the utilization rate of energy and equipment is low; combined type, including kettle-pipe or kettle-kettle type , in order to solve the shortcoming of the low polymerization rate of the single-tank reactor, the tubular reactor or the second reactor is connected after the first reactor, and the initiator is added to the tubular reactor or the second reactor at the same time, so as to improve the conversion The rate can generally reach 60-90%, but this method prolongs the line and time of the polymerization reaction, and the factors that need to be monitored and adjusted are greatly increased, especially as the polymerization rate continues to increase, the viscosity of the entire system will continue to rise. If Major problems such as implosion at any stage of the polymerization reaction will affect the entire line, and there will be great safety hazards during processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A production process of dual-initiator polymerization PMMA, in parts by weight, the steps are as follows:

[0018] (1) Ingredients: Take 80 parts of the main monomer methyl methacrylate, 10-30 parts of the comonomer, and the first initiator tert-butyl peroxyacetate 80×10 -4 Parts, the second initiator di-tert-butyl peroxide 20×10 -4 0.3 parts of chain transfer agent tert-dodecyl mercaptan and 0.1 part of release agent n-dodecanol. Stir thoroughly until they are evenly mixed and add them to the polymerization kettle;

[0019] (2) Polymerization: increase the temperature in the polymerization kettle, control the reaction temperature to 160°C, pressure 0.8MPa, and stir for 1 hour at a speed of 30r / min;

[0020] (3) Extrusion recovery: The material obtained in step (2) enters the devolatilization extruder, and the reaction is continued under the conditions of heating up to 220°C and pressure 1.5MPa in the front section of the extruder to increase the conversion rate; , Through the...

Embodiment 2

[0022] A production process of dual-initiator polymerization PMMA, in parts by weight, the steps are as follows:

[0023] (1) Ingredients: Take 90 parts of the main monomer methyl methacrylate, 10 parts of the comonomer ethyl acrylate, and the first initiator tert-butyl peroxybenzoate 70×10 -4 Parts, the second initiator di-tert-butyl peroxide 25×10 -4 0.3 parts of chain transfer agent tert-dodecyl mercaptan and 0.1 part of release agent n-dodecanol. Stir thoroughly until they are evenly mixed and add them to the polymerization kettle;

[0024] (2) Polymerization: increase the temperature in the polymerization vessel, control the reaction temperature at 140°C, pressure 1MPa, and stir and react for 2h at a speed of 60r / min;

[0025] (3) Extrusion recovery: The material obtained in step (2) enters the devolatilization extruder, and continues to react under the conditions of heating to 180°C and pressure 2MPa in the front section of the extruder to increase the conversion rate; in the ba...

Embodiment 3

[0027] A production process of dual-initiator polymerization PMMA, in parts by weight, the steps are as follows:

[0028] (1) Ingredients: take 80 parts of the main monomer methyl methacrylate, 20 parts of the comonomer ethyl acrylate, and the first initiator tert-butyl peroxyacetate 20×10 -4 Parts, the second initiator dicumyl peroxide 30×10 -4 1 part, chain transfer agent tert-dodecyl mercaptan 0.1 part, release agent n-dodecanol 0.1-0.3 parts fully stirred until they are evenly mixed, and added to the polymerization vessel;

[0029] (2) Polymerization: increase the temperature in the polymerization kettle, control the reaction temperature at 120°C, pressure 0.8MPa, and stir and react for 2h at a speed of 50r / min;

[0030] (3) Extrusion recovery: The material obtained in step (2) enters the devolatilization extruder, and the reaction is continued under the conditions of heating up to 170°C and pressure 3MPa in the front section of the extruder to increase the conversion rate; in the...

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Abstract

The invention belongs to the technical field of polymer preparation, relates to a preparation method of polymer, and in particular relates to a production process of polymethyl methacrylate (PMMA) through double-initiated polymerization. According to the production process, a single-kettle type reactor is combined with double initiating agents, staying time of materials in a reaction kettle is moderately prolonged, and after the materials enter a subsequent devolatilization type extruding machine, a part of initiating agents initiate reaction, so that polymerization rate is improved; and the reaction is limited in the single reaction kettle and the devolatilization type extruding machine, so that high polymerization rate and stable and controlled reaction system are guaranteed.

Description

Technical field [0001] The invention relates to a method for preparing a polymer, in particular to a production process of dual-initiated polymerization PMMA, and belongs to the technical field of polymer preparation. Background technique [0002] Polymethyl methacrylate resin, abbreviated as PMMA in English. 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 film, LED lamps, optical fiber materials, Optical products, auto parts, home appliance parts, and daily necessities. [0003] The production methods of PMMA include bulk polymerization, suspension polymerization, solution polymerization, emulsion polymerization and other polymerization processes. Among them, solvent and water are not used in the bulk polymerization process, which reduces the purification steps compared with other processes, which can ef...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F2/02C08F2/38C08F4/38C08F4/04
Inventor 沈斌君李国芳沈伟
Owner SUZHOU DOUBLE ELEPHANT OPTICAL MATERIALS CO LTD
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