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Continuous production process of polymethyl methacrylate

A polymethyl methacrylate, production process technology, applied in the field of polymer preparation, can solve the problems of difficult conversion rate control, inability to transport, low conversion rate, etc., to improve monomer conversion rate, improve product purity, improve conversion rate effect

Active Publication Date: 2013-06-05
SUZHOU DOUBLE ELEPHANT OPTICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main advantages of bulk polymerization are: no solvent is used, the purification process is reduced, and the purity and light transmittance of the product can be effectively improved; the main disadvantages of bulk polymerization are: it is difficult to control the heat of reaction and the conversion rate
Unstable reaction heat control will lead to unstable temperature of the reaction system, localized gel effect, affecting the quality of the final product, and in severe cases, it will lead to detonation and safety accidents; the conversion rate is too low, one is to increase the equipment in the recovery stage Second, it is easy to lead to low separation effect, and the monomer content in the final product is too high, which will have many adverse effects on post-processing; if the monomer conversion rate is too high, it cannot be used in the reaction kettle and Transport in pipeline
The main advantages of solution polymerization are: due to the use of solvents to reduce the viscosity of the reaction system, the heat of reaction can be effectively controlled to ensure a stable reaction; the main disadvantages of solution polymerization are: due to the presence of a large amount of solvents, one needs to be separated after the reaction Solvents increase the energy consumption of production. Second, because the monomers are diluted, the polymerization speed and monomer conversion rate are low. Third, the existence of solvents leads to lower performances such as product purity and light transmittance than bulk polymerization products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A continuous production process of polymethyl methacrylate, the steps are as follows in parts by weight:

[0024] (1) Pre-polymerization: Take 80 parts of methyl methacrylate as the main monomer, 20 parts of ethyl acrylate as the comonomer, 10 parts of toluene as the solvent, and 98×10 tert-butyl peracetic acid as the first initiator -4 Parts, 0.3 parts of chain transfer agent tert-dodecyl mercaptan, 0.1 part of release agent n-dodecyl alcohol, stir well until they are evenly mixed, add to the polymerization kettle, control the reaction temperature 140 ° C, pressure 1 MPa, at 30 r / min Stirring reaction under the rotating speed of 1h;

[0025] (2) Secondary polymerization: The mixture obtained in step (1) is continuously transported to the stirring heating tank through the pump, and the second initiator tert-butyl peroxyacetate 40×10 -4 Parts, 3 parts of propanol as an auxiliary devolatilization agent to continue the reaction, control the reaction temperature at 180°C, ...

Embodiment 2

[0028] A continuous production process of polymethyl methacrylate, the steps are as follows in parts by weight:

[0029] (1) Pre-polymerization: Take 70 parts of methyl methacrylate as the main monomer, 30 parts of ethyl acrylate as the comonomer, 20 parts of ethylbenzene as the solvent, and 120×10 tert-butyl peroxyacetate as the first initiator -4 part, 0.3 part of chain transfer agent tert-dodecyl mercaptan, 0.1 part of release agent n-dodecyl alcohol, stir well until they are evenly mixed, add them into the polymerization kettle, control the reaction temperature at 150°C, pressure at 1MPa, at 50r / min Stirring reaction under the rotating speed of 3h;

[0030] (2) Secondary polymerization: The mixture obtained in step (1) is continuously transported to the stirring heating tank through a pump, and the second initiator tert-butyl peroxyacetate 30×10 -4 part, 3 parts of isobutanol as a devolatizing agent to continue the reaction, control the reaction temperature to 200°C, the ...

Embodiment 3

[0033] A continuous production process of polymethyl methacrylate, the steps are as follows in parts by weight:

[0034] (1) Pre-polymerization: Take 90 parts of methyl methacrylate as the main monomer, 10 parts of butyl acrylate as the comonomer, 5 parts of xylene as the solvent, and 80×10 azobisisobutyronitrile as the first initiator -4 part, 0.3 part of chain transfer agent tert-dodecyl mercaptan, 0.1 part of release agent n-dodecyl alcohol, stir well until they are evenly mixed, add them into the polymerization kettle, control the reaction temperature at 80°C, pressure at 0.8MPa, at 80r / The reaction was stirred for 3h at a rotating speed of 1 min;

[0035] (2) Secondary polymerization: The mixture obtained in step (1) is continuously transported to the stirring heating tank through a pump, and the second initiator tert-butyl peroxyacetate 30×10 -4 5 parts, 5 parts of butanol, an auxiliary devolatilization agent, continue to react, control the reaction temperature at 160°...

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PUM

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Abstract

The invention relates to a polymer preparation method, particularly relates to a continuous production process of polymethyl methacrylate and belongs to the technical field of preparation of a polymer. According to the invention, polymethyl methacrylate is continuously produced through prepolymerization, secondary polymerization and tertiary polymerization sequentially. The continuous production method of polymethyl methacrylate is based on continuous mass polymerization, combines the advantages of mass polymerization and solution polymerization, effectively controls reaction heat, increases monomer conversion rate and enhances polymer purification efficiency.

Description

technical field [0001] The invention relates to a polymer preparation method, in particular to a continuous production process of polymethyl methacrylate, and belongs 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 plates, LED lamps, optical fiber materials, optical Products, auto parts, home appliance parts, and daily necessities. [0003] The methods for continuous production of PMMA mainly include bulk polymerization and solution polymerization. The main advantages of bulk polymerization are: no solvent is used, the purification steps are reduced, and the purity and light transmittance of the product can be effectively improved; the main disadvantages of bulk polymeriz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F220/18C08F2/38C08F2/06C08F6/10B29B9/06B29C47/92B29C48/92
CPCB29C48/92B29C2948/92514B29C2948/92704B29C2948/92895
Inventor 沈斌君李国芳沈伟
Owner SUZHOU DOUBLE ELEPHANT OPTICAL MATERIALS CO LTD
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