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Method for preparing vinyl polymer by bulk polymerization

A vinyl polymer, bulk polymerization technology, applied in the field of vinyl polymer preparation, can solve the problems of unsustainable, unsuitable for macro and continuous production, etc. The effect of high body conversion rate

Active Publication Date: 2020-06-19
成都辉聚光电材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What is even more unfavorable for actual production and use is that this method needs to end the reaction when the viscosity of the material increases to the point where stirring is difficult
For polymers with high Tg or high molecular weight, the viscosity increases rapidly during the polymerization process. When the monomer conversion rate is lower than 50%, the viscosity of the reaction material is already very high, and the stirring will be unable to continue due to the rod climbing effect.
Therefore, it is necessary to control the monomer conversion rate of the reaction, or add a solvent to the reaction system, which leads to a large amount of unreacted monomer and / or solvent remaining in the reaction product, and this method is not suitable for macro and continuous production

Method used

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  • Method for preparing vinyl polymer by bulk polymerization
  • Method for preparing vinyl polymer by bulk polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] The reaction device in this embodiment includes a closed material tank 7, a metering pump 8, a light reaction channel 9, a screw extrusion device 1, a condenser and a vacuum pump (not shown). The inlet of the metering pump 8 is connected to the outlet of the lower end of the material tank 7 , the outlet of the metering pump 8 is connected to the input of the photoreaction channel 9 , and the output of the photoreaction channel 9 is connected to the feed port 2 of the screw extrusion device 1 .

[0097] The screw extrusion device 1 includes a twin-screw extruder and a heater (for example, a cast aluminum heater) for heating the barrel of the screw extruder. The twin-screws of the twin-screw extruder rotate in the same direction, and the length-to-diameter ratio of the screws is L 0 / D 0 About 60, it is composed of twelve segments, the total length is 2160mm, the screw diameter is 35.6mm, the groove depth is 6mm, and the maximum speed is 600rpm.

[0098] The screw extru...

Embodiment 2

[0108] The reaction device in this embodiment includes a material tank 7, a metering pump 8, a screw extrusion device 1, a condenser and a vacuum pump (not shown). One end of the metering pump 8 is connected to the outlet of the material tank 7 , and the other end of the metering pump 8 is connected to the feed port 2 of the first-stage screw extruder 11 .

[0109] The screw extrusion equipment 1 includes a first-stage screw extruder 11 and a second-stage screw extruder 12 arranged in series, and a heater (for example, a cast aluminum heater) for heating the barrel of the screw extruder. The screw of the first-stage screw extruder 11 and the screw of the second-stage screw extruder 12 are vertically arranged. The material outlet of the first-stage screw extruder 11 is connected with the material inlet of the second-stage screw extruder 12 .

[0110] The first-stage screw extruder 11 is provided with an air inlet for inert gas to enter. The twin-screws of the first-stage scre...

Embodiment 3

[0119] Except following conditions, all the other are with embodiment 1:

[0120] Do not activate the heater.

[0121] 5.6 kg of vinyl monomers (butyl acrylate, methyl methacrylate and methacrylic acid) were recovered from the condenser.

[0122] The obtained vinyl polymer is tested, and its number average molecular weight M n =5.7×10 5 , the VOC content was 1.8wt%, and no residual monomer was detected. This indicates better polymerization with the heater turned on.

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Abstract

The invention discloses a method for preparing a vinyl polymer by bulk polymerization. According to the method, raw materials containing a vinyl monomer, a photoinitiator and a thermal initiator forma mixture or prepolymer as a first reaction material; the first reaction material is conveyed into screw extrusion equipment through the feeding hole of the screw extrusion equipment; a light-transmitting area is arranged near the feeding hole; a light source is started to irradiate the first reaction material in the screw extrusion equipment through the light-transmitting area so as to initiate the first reaction material to generate a photopolymerization reaction to obtain a second reaction material, the temperature of the second reaction material is increased by reaction heat, and the second reaction material is subjected to photopolymerization and thermal polymerization to obtain a third reaction material; and the third reaction material is subjected to devolatilization treatment to obtain the vinyl polymer. The process enables macroscopic and continuous production of vinyl polymers by photothermal bulk polymerization.

Description

technical field [0001] The invention relates to a method for preparing vinyl polymers, in particular to a method for preparing vinyl polymers by bulk polymerization. Background technique [0002] The free radical polymerization reaction of vinyl monomer is fast, and a large amount of heat will be released during the reaction process. The heat of polymerization needs to be taken away by the boiling of the solvent. At the same time, the addition of solvent reduces the viscosity of the reaction system and makes the reaction more uniform. The use of a large amount of solvents will cause waste of resources and environmental pollution. When applying vinyl polymers to prepare plates, pipes, and adhesives, it is necessary to remove the solvent in the reaction product, which affects production efficiency. [0003] CN101724120B discloses a method for preparing a methacrylate polymer. The method adopts a series circulation tube reactor, a straight tube reactor and a venting extruder,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/18C08F220/14C08F220/06C08F2/02C08F2/48C08F4/04C08F2/01
CPCC08F2/01C08F2/02C08F2/48C08F4/04C08F220/18
Inventor 王跃川鲜磊林燕兵
Owner 成都辉聚光电材料有限公司
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