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Ethylene/tetrafluoroethylene copolymer powder and method for preparing same

A tetrafluoroethylene and copolymer technology, which is applied in the field of ethylene/tetrafluoroethylene copolymer powder and its preparation, can solve the problems of decreased mechanical properties of the copolymer, easy discoloration, cracking of the polymer film, etc., and achieves tensile strength. and excellent elongation at break, low residual amount of powder solvent, and the effect of preventing the generation of air bubbles

Active Publication Date: 2015-09-23
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the binary copolymers of ETFE have defects in many aspects, such as high crystallinity, brittle and hard materials; the melting point can reach 300°C, which is close to its processing temperature, and discoloration, bubbles and cracks are prone to occur during processing; At high temperature, the mechanical properties of the copolymer decrease seriously, and the polymer film cracks under a small stress
However, the secondary drying time is usually longer, and it is difficult to realize mechanical / automation and large-scale production

Method used

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  • Ethylene/tetrafluoroethylene copolymer powder and method for preparing same
  • Ethylene/tetrafluoroethylene copolymer powder and method for preparing same
  • Ethylene/tetrafluoroethylene copolymer powder and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Solution copolymerization

[0025]Through the cycle process of vacuuming and high-purity nitrogen replacement, the high-pressure reactor is deoxidized so that the oxygen content in the reactor is less than 18ppm, and then 771 parts of perfluoro-n-hexane, 1 part of trifluoromethylethylene, 1.2 parts of perfluorohexylethylene, 0.1 part of soluble vinylidene fluoride / hexafluoropropylene copolymer, stirred to dissolve. Then import the mixed gas of ethylene (E) / tetrafluoroethylene (TFE) with a mass ratio of 15 / 50 to make the pressure in the kettle rise to 2.1MPa, then stir and heat up to 55°C, and inject 100 parts of 1% super Oxidation of tert-butyl pivalate in perfluoro-n-hexane to initiate polymerization. As the reaction progresses, the pressure drops, and the E / TFE mixed gas with a mass ratio of 15 / 50 is continuously introduced to maintain the pressure between 1.9 and 2.2 MPa. When the amount of ethylene (E) / tetrafluoroethylene (TFE) mixed gas introduced reached 65 ...

Embodiment 2～6

[0029] Step (1) The polymerization formula and process parameters are shown in Table 1, and the rest of the preparation method is the same as in Example 1.

[0030] See Table 2 for the yields and performance indexes of the powders obtained in Examples 1-6. in:

[0031] 【Powder Yield】

[0032] First obtain the solid content A% of the ETFE solution through the solid content test, calculate the theoretical powder yield a from the product of the feed amount and the solid content A%, and weigh the actual powder yield b after precipitation treatment. The powder yield is obtained from the quotient of b and a.

[0033] [melting point]

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PUM

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Abstract

The invention discloses ethylene / tetrafluoroethylene copolymer powder. The ethylene / tetrafluoroethylene copolymer powder comprises, by weight, 12.6-15.4 parts of ethylene, 45-55 parts of tetrafluoroethylene, 0.5-1.5 parts of trifluoromethyl ethylene, 0.05-0.5 part of soluble vinylidene fluoride / hexafluoropropylene copolymers, 0.3-1.8 parts of perfluoroalkyl compounds and 0.6-1.5 parts of initiators. The invention further discloses a method for preparing the ethylene / tetrafluoroethylene copolymer powder. The ethylene / tetrafluoroethylene copolymer powder and the method have the advantages that technologies are simple, and products are excellent in heat resistance, tensile strength and breaking elongation and good in processing performance.

Description

technical field [0001] The invention relates to the technical field of fluoropolymers, in particular to an ethylene / tetrafluoroethylene copolymer powder and a preparation method thereof. Background technique [0002] Ethylene / tetrafluoroethylene copolymer (hereinafter also referred to as E for ethylene, TFE for tetrafluoroethylene, ETFE or F40 for ethylene / tetrafluoroethylene copolymer) has excellent insulation, heat resistance and corrosion resistance, and is currently Important insulating material for aerospace cables. ETFE has excellent solvent resistance, and is widely used in chemical anti-corrosion fields such as plastic-coated reactors, storage tanks, and pipelines. ETFE has high transparency, aging resistance, stain resistance, non-stickiness and excellent processing performance, etc., and can be used to produce high-performance membrane materials. In addition, ETFE can also produce high-performance engineering plastic products, or made into fibers for sewage treat...

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F210/02C08F214/18C08F2/06C08J3/12
Inventor 裴金东王树华王金明余晓斌郑明华
Owner JUHUA GROUP TECH CENT
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