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Production technique for mass polyvinyl chloride

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-quality products, high rate of B-grade products, etc., to reduce the rate of B-grade products, reduce The effect of product agglomeration and internal quality improvement

Inactive Publication Date: 2017-09-12
YIBIN TIANYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the prior art that there are many batches of pressure fluctuations in the late stage of the polymerization reaction process, the rate of B-grade products is high, and the rate of excellent-grade products is low, the present invention develops a new binary composite initiator formula system, using a A new type of initiator Luperox 701M70, tert-butyl peroxyneheptanoate, replaces the late initiator LPO in the original formula, namely lauryl peroxide, and the new binary composite initiator formula system is EHPD+701M70 system

Method used

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  • Production technique for mass polyvinyl chloride
  • Production technique for mass polyvinyl chloride
  • Production technique for mass polyvinyl chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Bulk polyvinyl chloride type 7 resin is produced as follows:

[0044] (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.

[0045] (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, the polymerization kettle is vacuum replaced; then 15t of vinyl chloride monomer is added to the polymerization kettle, and the "seed" obtained in step (1) is added, and the initiator EHPD of 0.04% of the total mass of the vinyl chloride monomer is added and 0.007% initiator Luperox 701M70, then pass hot w...

Embodiment 2

[0048] Bulk polyvinyl chloride type 7 resin is produced as follows:

[0049](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.

[0050] (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 0.04% of the total mass of vinyl chloride monomer to initiate agent EHPD and 0.007% initiator Luperox 701M70, and then pass hot water at 80°C ...

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Abstract

The invention discloses a production technique for mass polyvinyl chloride. The production technique for mass polyvinyl chloride comprises a prepolymerization stage and a polymerization stage. A novel initiator Luperox 701M70 replaces an original initiator LPO; a new binary composite initiator formula system is used for polymerization reaction, heat release is balanced in mass polymerization reaction, heat transfer of a system is facilitated, polymerization pressure is controlled stably, heat of the polymerization reaction is easy to control, caking of the product is reduced, the B-grade product rate is reduced, the thermal stability of PVC resin is improved, the inner quality of the product is improved, and the post processing performance of the product is improved.

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 carried out in two 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...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F4/38C08F2/02
CPCC08F114/06C08F2/02C08F4/38
Inventor 邓敏陈洪罗泽蓉
Owner YIBIN TIANYUAN GRP CO LTD
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