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Polychlorotrifluoroethylene resin and preparation method thereof

A technology of polychlorotrifluoroethylene and chlorotrifluoroethylene, which is applied in coatings, anti-corrosion coatings, etc., can solve the problems of low specific gravity of emulsion, low temperature of strength loss, pollution, etc., reduce impurity metal ions, increase reaction speed, The effect of increasing the mass transfer area

Active Publication Date: 2017-06-13
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, mixed solvents not only increase post-processing, raw material costs, and pollution, but also have adverse effects on product performance.
[0011] At present, the preparation method of PCTFE products mainly has problems such as slow reaction speed, long reaction time, low conversion rate and low emulsion specific gravity. PCTFE products mainly have problems such as poor appearance, low molecular weight and low strength loss temperature, which need to be improved. In order to meet market requirements and realize industrial production

Method used

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  • Polychlorotrifluoroethylene resin and preparation method thereof
  • Polychlorotrifluoroethylene resin and preparation method thereof
  • Polychlorotrifluoroethylene resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] In a 10L stainless steel reactor with a stirrer, the material is 904L, the ratio of length to diameter is 2.0, and 6.0kg of deionized water is added. Use a vacuum pump to evacuate the air in the reactor, and then replace it with nitrogen. Repeat nitrogen filling and evacuation and degassing until the oxygen content reaches 30ppm or less. Then replace with chlorotrifluoroethylene (CTFE) monomer until the oxygen content in the reactor drops to Below 30ppm. Then turn on the stirring, the speed is 50rpm, the temperature is raised to 40°C, and the CTFE monomer is added to the reactor through the compressor until the kettle pressure reaches 1.0MPa. After the temperature and pressure are stable, add 2.0g of NaOH, 1.0g of ferrous sulfate, and 10g of Na through the micrometering pump. 2 S 2 O 5 , 10g potassium persulfate, start the reaction. Continuously replenish the reacted monomer through the compressor to maintain the pressure of the reactor at 1.0 MPa. The reaction was sto...

Embodiment 2

[0092] According to the method of Example 1, the initiator is changed to perfluorodipropionyl peroxide, and the others remain unchanged. Take some samples for testing, and the results are listed in Table 1.

Embodiment 3

[0094] According to the method of Example 1, change the initiator to IPP, and the others remain unchanged. Take some samples for testing, and the results are listed in Table 1.

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Abstract

The invention relates to a preparation method of polychlorotrifluoroethylene resin, which adopts a horizontal reactor with an aspect ratio ≥ 1.0 as polymerization equipment; uses chlorotrifluoroethylene monomer or chlorotrifluoroethylene monomer and other comonomers The polymerization reaction occurs under constant pressure conditions, which improves the reaction speed and polymerization efficiency; the semi-mechanical and semi-chemical coagulation method is used to effectively separate the impurities in the emulsion, and the residual unstable groups are removed through wet heat treatment, effectively reducing the volatilization of the product parts, greatly improving the appearance of the product. M can be obtained by the method of the present invention η PCTFE and its copolymerization products exceeding 500,000, volatile matter less than 0.01%, strength loss temperature higher than 260°C, yellowness index (YI) less than 10.

Description

Technical field [0001] The invention relates to the technical field of polymer resins, in particular to a polychlorotrifluoroethylene resin and a preparation method thereof. Background technique [0002] Polychlorotrifluoroethylene (PCTFE) is the first thermoplastic fluorine-containing resin developed for industrial production. Germany was the first to conduct research, and in 1934 developed the first fluoroplastic variety-PCTFE. Since then, the United States has done a lot of research work on the performance of PCTFE during the implementation of the Manhattan Project. The United States announced the successful development in 1942 and put it into production in 1946. At that time, it was mainly used to separate uranium isotope gas diffusion materials. Since then, PCTFE has achieved industrial production in the United States, the Soviet Union, France, Japan, Germany and other countries. In 1966, my country built a production facility with an annual output of 25t PCTFE resin. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/24C08F214/24C08F2/01C08F6/22C09D127/12C09D5/08C08L27/12
Inventor 张廷健张建新汪仲权王先荣余金龙
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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