Tetrafluoroethylene-based copolymer and its preparation method

A tetrafluoroethylene copolymer and tetrafluoroethylene technology, which are applied in the field of tetrafluoroethylene copolymer and its preparation, can solve the problems of poor thermal stability, low melting point of the product, and reduced durability of the composition, and achieve enhanced flexibility. , the effect of improving transparency and avoiding damage

Active Publication Date: 2021-01-15
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the product has a low melting point, the lower limit of the melting point is 160°C, and the thermal stability is relatively poor
The disadvantage is that the ratio of PTFE to PFA needs to be precisely controlled when mixing, and if PTFE cannot be uniformly mixed in the composition, the durability of the composition will be reduced

Method used

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  • Tetrafluoroethylene-based copolymer and its preparation method
  • Tetrafluoroethylene-based copolymer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) In an oxygen-free 100L stainless steel polymerization kettle, add 60L of deionized water, 500g of perfluoropolyether ammonium carboxylate CF 3 CF 2 OCF 2 OCF 2 COONH 4 (40wt%), after vacuumizing the inside of the polymerizer, add the mixture of 3kg perfluorooctane, perfluoroheptane and perfluorocyclohexane, 1000g of PPVE and 600g of perfluoropropenyl alkoxy ether CF 2 = CFCF 2 OCF 2 C F(CF 3 )OC 3 f 7 , and then filled with methane to increase the pressure in the polymerization kettle by 0.5MPa, and the temperature of the polymerization kettle was raised to 90°C. When the pressure reached 2.7MPa, the prepared 45g potassium persulfate and ammonium persulfate mixture was quickly pumped into the polymerization kettle through the auxiliary pump Among them, the sign of the start of the polymerization reaction is that the pressure in the polymerization tank begins to drop;

[0045] (2) Continuously add tetrafluoroethylene monomer to keep the temperature and press...

Embodiment 2

[0048] (1) In an oxygen-free 100L stainless steel polymerization kettle, add 60L of deionized water, 500g of perfluoropolyether ammonium carboxylate CF 3 CF 2 OCF 2 OCF 2 COONH 4 (40wt%), after vacuumizing the inside of the polymerizer, add the mixture of 5kg perfluorooctane, perfluoroheptane and perfluorocyclohexane, 800g of PPVE and 300g of perfluoropropenyl alkoxy ether CF 2 = CFCF 2 OCF 2 CF(CF 3 )OC 3 f 7 , then fill in methane to increase the pressure in the polymerization kettle by 0.6MPa, raise the temperature of the polymerization kettle to 85°C, and when the pressure reaches 2.7MPa, quickly inject the prepared 100g potassium persulfate and ammonium persulfate mixture into the polymerization kettle through the auxiliary pump Among them, the sign of the start of the polymerization reaction is that the pressure in the polymerization tank begins to drop;

[0049] (2) Continuously add tetrafluoroethylene monomer to keep the temperature and pressure constant in th...

Embodiment 3

[0052] (1) In an oxygen-free 100L stainless steel polymerization kettle, add 60L of deionized water, 500g of perfluoropolyether ammonium carboxylate CF 3 CF 2 OCF 2 OCF 2 COONH 4 (40wt%), after vacuumizing the inside of the polymerizer, add the mixture of 5kg perfluorooctane, perfluoroheptane and perfluorocyclohexane, 600g of PPVE and 200g of perfluoropropenyl alkoxy ether CF 2 = CFCF 2 OCF 2 CF(CF 3 )OC 3 f 7 , then fill in methane to increase the pressure in the polymerization kettle by 0.6MPa, raise the temperature of the polymerization kettle to 85°C, and when the pressure reaches 2.7MPa, quickly inject 200g of the prepared mixed solution of potassium persulfate and ammonium persulfate into the polymerization kettle through the auxiliary pump Among them, the sign of the start of the polymerization reaction is that the pressure in the polymerization tank begins to drop;

[0053] (2) Continuously add tetrafluoroethylene monomer to keep the temperature and pressure c...

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Abstract

The invention belongs to the field of fluorine-containing polymer materials, and particularly relates to a tetrafluoroethylene copolymer and a preparation method thereof. The tetrafluoroethylene copolymer is a terpolymer comprising 90-98 wt% of tetrafluoroethylene, 1-7 wt% of perfluoro-n-propyl vinyl ether and 1-3 wt% of perfluoro-propenyl alkoxy ether with a CF<2>=CFCF<2>[OCF<2>CF(CF<3>)]<n>OR<f>structure or a hydrogen-containing derivative thereof, wherein n is an integer of 0-5, and R<f> is a perfluoroalkyl group provided with 1-5 carbon atoms or the derivative containing hydrogen atoms. The tetrafluoroethylene copolymer has good melting fluidity and thermal stability, high flexibility, high transparency and high surface finish. A green environment-friendly solvent is adopted in the preparation method, and damage to the atmospheric ozone layer is avoided, energy is saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the field of fluorine-containing polymer materials, and in particular relates to a tetrafluoroethylene-based copolymer and a preparation method thereof. Background technique [0002] Fusible polytetrafluoroethylene was first published in US Patent No. 3,635,926 in 1972, and its trade name is Teflon PFA. It is a copolymer of tetrafluoroethylene and a small amount of perfluoropropyl vinyl ether. Its main chain structure endows it with properties very similar to polytetrafluoroethylene. It has excellent chemical stability, physical and mechanical properties, electrical insulation properties, and lubrication. non-stick, aging resistance, non-combustibility and thermal stability. Because the main chain contains perfluoroalkoxy side groups, the flexibility of the chain is increased, the melt viscosity of the polymer is improved, and it can be thermally processed by general processing technology. [0003] Fusible polytetrafluoroethy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F216/14
Inventor 王汉利朱倩孟祥青侯兴志
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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