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Perfluoro polymer fiber and preparation method thereof

A perfluoropolymer and fiber technology, which is applied in the direction of conjugated synthetic polymer rayon, fiber processing, textiles and paper making, etc. The effect of large specific surface area and short spinning process

Active Publication Date: 2011-08-03
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the perfluoropolymer fiber with porous structure and its preparation method have not been reported in the literature within the scope of the applicant's search.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Polyperfluoroethylene propylene with a hexafluoropropylene content of 18% is used as the polymer matrix phase, and the content is 90wt%; the composite porogen is 0.01 μm SiO 2The powder, the content is 5wt%, and the organic liquid is DBP, the content is 5wt%. Compulsory porogen and organic liquid are mixed uniformly through a mixing tank to obtain a viscous mixture, which is then mixed with granular perfluoropolymer resin, fed into a twin-screw extruder, and melt-spun through a melt-spinning spinneret Silk, the obtained primary porous fibers are first stretched and then extracted and washed. The stretching ratios are 1, 1.2 and 1.5 times respectively, and the extraction and washing time is 8 hours.

[0023] The obtained porous fibers are correspondingly recorded as 1#, 2# and 3# fibers. The average surface porosities of the obtained porous fibers were 5.3%, 8.3% and 12.7%, respectively. The average diameters of porous fibers are 22.3 μm, 21.6 μm and 19.7 μm, respectiv...

Embodiment 2

[0025] In embodiment 1, other conditions are the same as embodiment 1, will obtain the porous fiber and stretch after first extracting and washing, and the draw ratio is respectively 1, 1.2 and 1.5 times,

[0026] The obtained fibers are correspondingly recorded as 4#, 5# and 6# fibers. The average surface porosity of the obtained fibers was 5.5%, 6.7% and 9.4%, respectively. The average diameters of the porous fibers are 22.3 μm, 20.4 μm and 18.2 μm, respectively.

Embodiment 3

[0028] Polyperfluoroethylene propylene with a hexafluoropropylene content of 18% is used as the polymer matrix phase, the content is 60 wt%, and the composite porogen is 0.01 SiO 2 Powder, 5μm CaCO 3 The powder mixture has a content of 25 wt%, and the organic liquid is DOP, and the content is 15%. Compulsory porogen and organic liquid are mixed uniformly through a mixing tank to obtain a viscous mixture, which is then mixed with granular perfluoropolymer resin, fed into a twin-screw extruder, and melt-spun through a melt-spinning spinneret Silk, the obtained porous fibers are first stretched and then washed, and the stretching ratios are 1, 1.2 and 1.5 times respectively,

[0029] The obtained fibers are correspondingly recorded as 7#, 8# and 9# fibers. The average surface porosities of the obtained fibers were 9.3%, 11.7% and 14.9%, respectively, and the average fiber diameters were 28.3 μm, 26.2 μm and 23.3 μm, respectively.

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Abstract

The invention discloses a perfluoro polymer fiber and a preparation method thereof. The fiber spinning system comprises the following components in percentage by weight: 40 to 60 percent of perfluoro polymer, 30 to 40 percent of composite porogen and 10 to 30 percent of organic liquid; interfingered dissolution micropores and stretching micropores with the pore diameter of 0.1 to 5mu m are formedon the surface of the fiber; and the fiber is suitable to be continuously used in a temperature range of 85 to 200 DEG C, is subjected to corrosion reaction with a fluorine element at a high temperature, melted sodium hydroxide metal or chlorine trifluoride, and is not subjected to corrosion reaction when contacted with other chemical medicines. The spinning system and a process are adopted in the preparation method, and the process comprises the following steps of: forcibly mixing the composite porogen and the organic liquid; uniformly mixing a mixture and the perfluoro polymer, injecting into a double-screw extruder, and performing melt spinning at the temperature higher than the melting point of the perfluoro polymer to obtain a porous as-spun fiber; and extracting, washing, and stretching.

Description

technical field [0001] The invention relates to fiber preparation technology, in particular to a perfluoropolymer fiber and a preparation method thereof. The fiber has a porous structure, a large specific surface area, high adsorption efficiency, high temperature resistance, corrosion resistance, and is suitable for repeated use under harsh conditions such as high temperature, acid, and alkali. Background technique [0002] The excellent properties of perfluoropolymers such as corrosion resistance, heat resistance, non-stickiness, low friction coefficient, and atmospheric aging resistance make it an ideal filter for high-temperature dust removal, particle separation, and corrosive gas separation under harsh conditions. Material. [0003] However, at present, the perfluoropolymer fiber material at home and abroad is mainly polytetrafluoroethylene (PTFE). However, the "insoluble and infusible" characteristics of PTFE make its processing performance very poor, and it cannot p...

Claims

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Application Information

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IPC IPC(8): D01F6/48D01D5/247D01F8/10
Inventor 肖长发黄庆林胡晓宇安树林
Owner TIANJIN POLYTECHNIC UNIV
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