Polyvinyl chloride production method adding chain extender to match with later-stage heating process

A technology of polyvinyl chloride and production method, which is applied in the field of polyvinyl chloride production in which a chain extender is added and a post-heating process is used, which can solve problems such as long constant temperature polymerization reaction cycle and influence on enterprise output, and achieve Charpy notched impact strength and The effect of high tensile strength, short reaction cycle and wide molecular weight distribution

Active Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the compound system of chain extender and chain transfer agent is used to improve the processability of the product, the single-pot polymerization time is still more than 10h
It has not really solved the problem that the long reaction cycle of constant temperature polymerization seriously affects the output of enterprises

Method used

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  • Polyvinyl chloride production method adding chain extender to match with later-stage heating process
  • Polyvinyl chloride production method adding chain extender to match with later-stage heating process
  • Polyvinyl chloride production method adding chain extender to match with later-stage heating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Components and dosage:

[0032]

[0033]

[0034] The aggregation method is as follows:

[0035] Rinse the polymerization kettle clean, apply anti-sticking agent and rinse, then vacuumize, add deionized water, dispersant, initiator, pH regulator, etc. according to the polymerization formula, and then vacuumize until the vacuum degree is -0.1 Mpa, then add the formula amount of vinyl chloride monomer, stir for 10 minutes, heat up to the first reaction temperature of 55°C and start timing. React for about 2.2 hours, and the polymerization conversion rate reaches about 70%. Use a high-pressure pump to add the chain extender diallyl maleate (DAM) emulsion into the polymerization kettle within 20 minutes, and increase the temperature in the polymerization kettle. The temperature raising speed is 0.8°C / min, reach the second reaction temperature of 65°C, maintain it for a period of time, when the total reaction time reaches 4h and the conversion rate reaches the predete...

Embodiment 2

[0037] After adding the materials, stir coldly for 2 minutes and react for about 2.4 hours. When the polymerization conversion rate reaches about 60%, use a high-pressure pump to add the chain extender diallyl maleate (DAM) emulsion into the polymerization kettle within 20 minutes to extend the chain. The addition amount of diallyl maleate (DAM) emulsion is 1 part. After stirring for 2 minutes, the material was emptied and discharged. All the other components and polymerization method are with embodiment 1.

Embodiment 3

[0039] When the reaction is carried out for about 3.2 hours and the polymerization conversion rate reaches about 50%, the chain extender diallyl maleate (DAM) emulsion is added into the polymerization kettle within 20 minutes with a high-pressure pump, and the chain extender diene maleate The addition amount of propyl ester (DAM) emulsion is 0.7 part. The addition amount of the dispersion system is 0.07 parts, after stirring for 10 minutes, the material is emptied and discharged. All the other components and polymerization method are with embodiment 1.

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Abstract

The invention relates to a polyvinyl chloride production method adding a chain extender to match with a later-stage heating process. The production method is characterized in that during the polymerization reaction process, when the polymerization conversion rate achieves 50%-75%, the chain extender is added into a polymerization kettle by a high-pressure pump, the using quantity of the chain extender is 10-10000ppm of the total quantity of polyvinyl chloride, the material temperature in the polymerization kettle is simultaneously increased by 1-25 DEG C, and the temperature increasing speed is 0.2-3 DEG C/min. Polyvinyl chloride resin produced by adopting the production method disclosed by the invention has a larger molecular weight distribution width index than that of the resin with the same number-average molecular weight and further keeps the excellent processing performance of the resin produced by a pure polymerization later-stage heating process; and simultaneously, the impact strength and tensile strength of a simply supported girder gap of a product are higher than those of the resin produced by adopting the pure polymerization later-stage heating process and equivalent to those of the resin produced by a constant-temperature polymerization process, and good resin processing performance and great product mechanical performance are further realized.

Description

technical field [0001] The invention relates to a polyvinyl chloride production method in which a chain extender is added and a post-stage heating process is used, and belongs to the technical field of polyvinyl chloride production methods. Background technique [0002] At present, most polyvinyl chloride products are made by adding vinyl chloride, deionized water, initiator system, dispersion system, pH regulator, chain transfer agent, etc. into the polymerization kettle, and at a certain temperature within the commonly used vinyl chloride polymerization temperature range Constant temperature reaction, adding a terminator when the polymerization conversion rate meets the process requirements, then removing unreacted vinyl chloride monomer in the polymerization system, centrifuging to remove the suspension and drying to obtain polyvinyl chloride resin. This traditional method not only has poor processability of the resin but also has a long reaction cycle, which seriously af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/06C08F2/18C08F2/38C08F218/18C08F222/28C08F218/16C08F212/36C08F222/14C08F222/20
Inventor 张立红梁斌于永玲张磊李留忠王晶鲍春伟车万里朱卫东郭卫东张勇袁锦慧
Owner CHINA PETROLEUM & CHEM CORP
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