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Mass polyvinyl chloride production technique

A polyvinyl chloride, production process technology, applied in the field of vinyl chloride polymerization reaction process, can solve the problems of many batches of pressure fluctuations, low rate of high-grade products, high rate of B-grade products, etc., to reduce the rate of B-grade products, improve Effect of thermal stability and stable reaction temperature

Inactive Publication Date: 2017-08-18
YIBIN TIANYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of unbalanced heat release in the polymerization reaction process in the prior art, many batches of pressure fluctuations, high grade B product rate, and low product excellent grade product rate, the present invention develops a new binary composite initiator formula system , using a new type of initiator 10M85 (tert-butyl peroxyneodecanoate) to replace EHPD (diethylhexyl peroxydicarbonate) in the original formula, the new binary composite initiator formula system is 10M85+701M70 system

Method used

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  • Mass polyvinyl chloride production technique
  • Mass polyvinyl chloride production technique
  • Mass polyvinyl chloride production technique

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Effect test

Embodiment 1

[0039] (1) After the pre-polymerization tank completes the vacuum replacement, the liquid vinyl chloride monomer is transported into the pre-polymerization tank with a monomer pump. The temperature is as high as 68°C, and the pressure is 1.2MPa, and the pre-polymerization reaction is carried out, and the "seed" is obtained after 15 minutes of reaction.

[0040] (2) Add 3000g of polymerization aid antioxidant 2,6-di-tert-butyl-p-cresol and 200g of polymerization aid thickener crotonic acid, ethyl acetate copolymer and 2L of nitric acid solution with a mass concentration of 20% In the polymerization kettle, and vacuum replace the polymerization kettle; then add 15t of vinyl chloride monomer to the polymerization kettle, and add the "seed" obtained in step (1), and then add the initiator 10M85 with 0.03% of the total mass of vinyl chloride monomer and 0.007% initiator 701M70, then pass hot water at 80°C into the interlayer of the polymerization kettle shell to heat the mixed mate...

Embodiment 2

[0043] (1) After the pre-polymerization tank completes the vacuum replacement, the liquid vinyl chloride monomer is transported into the pre-polymerization tank with a monomer pump. The temperature is as high as 68°C, and the pressure is 1.2MPa, and the pre-polymerization reaction is carried out, and the "seed" is obtained after 15 minutes of reaction.

[0044] (2) 2800g polymerization aid antioxidant 2,6-di-tert-butyl p-cresol and 186g polymerization aid thickener crotonic acid, ethyl acetate copolymer and 1.8L mass concentration are 20% nitric acid solution together Put into the polymerization kettle, and vacuum replace the polymerization kettle; then add 14.5t vinyl chloride monomer to the polymerization kettle, and add the "seed" obtained in step (1), and then add 0.03% of the total mass of vinyl chloride monomer to initiate Agent 10M85 and 0.007% initiator 701M70, and then pass hot water at 80°C into the interlayer of the polymerization kettle shell to heat the mixed mate...

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Abstract

The invention discloses a bulk polyvinyl chloride production process, which includes pre-polymerization and polymerization stages. The present invention uses novel initiator Luperox10M85 to replace the original initiator EHPD, and the polymerization reaction uses a new binary compound formula system. Since the initiation efficiency of 10M85 is lower than that of EHPD, under the same amount of initiator, the heat release in the early stage of polymerization is slower, and the reaction The temperature is more stable, and the new compound initiator formula system can balance the heat release before and after the bulk polymerization process, which is beneficial to the heat transfer of the system, and the polymerization pressure control is more stable; the reaction temperature is more stable, the polymerization heat is easy to control, and the agglomeration is reduced. Grade B product rate improves the thermal stability of PVC resin, improves the internal quality of the product, and is conducive to improving the post-processing performance of the product.

Description

technical field [0001] The invention relates to a vinyl chloride polymerization reaction process, in particular to a process for producing polyvinyl chloride by a vinyl chloride bulk method. Background technique [0002] The production of polyvinyl chloride (PVC) resin mainly includes four methods: suspension polymerization, bulk polymerization, emulsion polymerization and microsuspension polymerization. Suspension polymerization accounts for 80% of the output, bulk polymerization accounts for 10%, and emulsion and microsuspension polymerization accounts for 10%. %. [0003] Bulk polymerization adopts batch operation, and its technological process is divided into 2 steps: (1) pre-polymerization: carry out in the pre-polymerization tank, add 1 / 3~1 / 2 of the total amount of VCM and initiator, and the conversion rate is controlled at 8% ~12%; (2) Polymerization: Carry out in a polymerization kettle, after transferring all the pre-polymerized materials, add the remaining 1 / 2~2 / 3...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/02C08F4/38
CPCC08F114/06C08F2/02C08F4/38
Inventor 罗云邓敏陈洪唐堂
Owner YIBIN TIANYUAN GRP CO LTD
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