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Polymethyl methacrylate (PMMA) continuous production process for long-time operation without accumulation

A long-term operation and production process technology, which is applied in the preparation of polymers and PMMA continuous production process, can solve the problems that the reaction cannot continue continuously, the product contains foreign matter, polymer accumulation, etc., and achieves the goal of ensuring long-term continuous and stable operation Effect

Active Publication Date: 2014-12-10
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, the main route of continuous bulk polymerization of PMMA is basically batching→polymerization→monomer removal and recovery→products; however, if long-term mass production is the goal, there is still the problem of polymer accumulation in containers and pipelines : 1. The inner wall of the reactor is easy to accumulate material after long-term reaction. 2. The gas phase part of the reactor, especially at the gas-liquid interface, is prone to material accumulation due to the existence of monomer vapor. Polymerization, accumulation
The accumulation of material will affect the product quality, resulting in foreign matter and black spots in the product; it will also block the container pipeline, resulting in the inability to continue the reaction, requiring shutdown and cleaning, and for formal large-scale production, the cost of shutdown cleaning is quite large. It is not economically desirable to stop the machine just because of material accumulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of PMMA continuous production technique that long-term operation does not accumulate material, steps are as follows by weight:

[0026] (1) Pre-polymerization: Take 80 parts of methyl methacrylate as the main monomer, 20 parts of butyl 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, 0.1-0.3 parts of n-dodecyl alcohol as release agent, stir well until they are evenly mixed, add them into the polymerization kettle, control the reaction temperature at 150°C, pressure at 1MPa, at 30r Stirring reaction 3h under the rotating speed of / min;

[0027] The polymerization kettle adopts the form of entering from the bottom and exiting from the top. During normal production, the polymerization kettle is kept fully filled and the pressure is kept stable. The inner wall of the polymerization kettle is chrome-plated or polished, and a ribb...

Embodiment 2

[0035] A kind of PMMA continuous production technique that long-term operation does not accumulate material, steps are as follows by weight:

[0036] (1) Pre-polymerization: Take 90 parts of methyl methacrylate as the main monomer, 10 parts of butyl acrylate as the comonomer, 15 parts of ethylbenzene as the solvent, and 98×10 tert-butyl peracetic acid as the first initiator -4 part, 0.3 part of chain transfer agent tert-dodecyl mercaptan, 0.1 part of mold release agent n-dodecyl alcohol, stir well until they are evenly mixed, add them into the polymerization kettle, control the reaction temperature at 160°C, pressure at 0.8MPa, at 80r / The reaction was stirred for 1 h at a speed of 1 min;

[0037] The polymerization kettle adopts the form of entering from the bottom and exiting from the top. During normal production, the polymerization kettle is kept fully filled and the pressure is kept stable. The inner wall of the polymerization kettle is chrome-plated or polished, and a ri...

Embodiment 3

[0060] A kind of PMMA continuous production technique that long-term operation does not accumulate material, steps are as follows by weight:

[0061] (1) Pre-polymerization: Take 100 parts of methyl methacrylate as the main monomer, 25 parts of comonomer, 5 parts of solvent, and 110×10 first initiator -4 Parts, 0.5 parts of chain transfer agent, 0.3 parts of release agent, fully stirred until they are evenly mixed, added to the polymerization kettle, controlled reaction temperature 140 ° C, pressure 1.2 MPa, stirred and reacted at a speed of 70 r / min for 1 h;

[0062] The polymerization kettle adopts the form of entering from the bottom and exiting from the top. During normal production, the polymerization kettle is kept fully filled and the pressure is kept stable. The inner wall of the polymerization kettle is chrome-plated or polished, and a ribbon stirrer is used;

[0063] (2) Secondary polymerization: The mixture obtained in step (1) is continuously transported to the sti...

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PUM

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Abstract

The invention relates to a preparation method of a polymer, particularly relates to a polymethyl methacrylate (PMMA) continuous production process for long-time operation without accumulation, and belongs to the technical field of polymer preparation. A polymeric kettle and a stirring warming kettle which enter from the bottom and leave from the top are used, and use a ribbon-type stirrer and chromeplated or polished inner walls; a small amount of an inert solvent is added in the reaction mixture to increase the fluidity of a mixture system; an extruder screw and the inner walls are chromeplated; and by such means as adding a circulation loop and adding a polymerization inhibitor between a distillation column reboiler and a waste liquid tank, the polymer is prevented from being accumulated in a container or a pipeline when the PMMA continuous body is polymerized, and long-time continuous and stable operation is ensured.

Description

technical field [0001] The invention relates to a polymer preparation method, in particular to a PMMA continuous production process with long-term operation without accumulation, 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 plate film, LED lamps, optical fiber materials, Optical products, auto parts, home appliance parts, and daily necessities. [0003] The methods for producing PMMA include bulk polymerization, suspension polymerization, solution polymerization, emulsion polymerization and other polymerization processes. Among them, bulk polymerization does not use solvents and water. Compared with other processes, the purification process is reduced, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F220/18C08F2/38C08F2/06C08F6/10B29B9/06B29C47/92B29C48/92
CPCB29C47/92B29C48/92B29C2948/92514B29C2948/92704B29C2948/92895
Inventor 沈斌君李国芳沈伟
Owner SUZHOU DOUBLE ELEPHANT OPTICAL MATERIALS CO LTD
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