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Grease-proofing modifying method of polytetrafluoroethylene cellular material

A technology of polytetrafluoroethylene and microporous materials, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as shortened membrane life, increased filtration resistance, and decreased flux

Active Publication Date: 2014-06-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PTFE microporous materials tend to adsorb organic substances such as oil and protein during application, resulting in increased filtration resistance, decreased flux and shortened membrane life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Mix the water-dispersible fluorine-containing dispersion concentrate Daikin polyflon D210, D610, and Neoflon ND-110, and mix the mixture with alcohol at a mass ratio of 1:0.5 to obtain a water-dispersible fluorine-containing dispersion concentrate solution; Daikin F106 polytetrafluoroethylene resin powder and aviation kerosene are mixed at a mass ratio of 1:0.2 to form a mixed resin; the above-mentioned fluorine-containing dispersion concentrate solution and mixed resin are blended at a mass ratio of 0.1:1 to form a mixed material; the mixed material is placed in 20 ℃ oven, let it stand for 96 hours, and then let it stand for 10 hours at 40°C to form a polytetrafluoroethylene mixture;

[0020] (2) The polytetrafluoroethylene mixture material is formed into a cylindrical blank on a compacting machine at 30°C; the cylindrical blank is formed into a rod on a pusher at 40°C; the size of the cylindrical blank and the rod is determined by processing The mold is determined...

Embodiment 2

[0023] (1) Water-dispersible fluorine-containing dispersion concentrate DuPont Teflon ? Mix TE 3875, TE3864 and TE7224, mix the mixture and alcohol at a mass ratio of 1:0.8 to obtain a water-dispersible fluorine-containing dispersion concentrate solution; mix Daikin F201 PTFE resin powder and aviation kerosene at a mass ratio of 1:0.28 Form a mixed resin; blend the above-mentioned fluorine-containing dispersion concentrate solution and mixed resin at a mass ratio of 0.3:1 to form a mixed material; place the mixed material in an oven at 40°C for 144 hours, and then stand at 80°C for 16 hour, form polytetrafluoroethylene mixed material;

[0024] (2) The polytetrafluoroethylene mixture is formed into a cylindrical blank on a compactor at 40°C; the cylindrical blank is formed into a rod on a pusher at 60°C; the rod is rolled at 60°C The polytetrafluoroethylene base tape is formed on the machine; the polytetrafluoroethylene base tape is longitudinally stretched 6 times in an oven ...

Embodiment 3

[0027] (1) Mix the water-dispersible fluorine-containing dispersion concentrate FR301B, FR302, FR503, FJC-R0610 and FJC-R0620, mix the mixture and alcohol at a mass ratio of 1:0.7 to obtain a water-dispersion fluorine-containing dispersion concentrate solution; DF205 polytetrafluoroethylene resin powder and aviation kerosene are mixed at a mass ratio of 1:0.24 to form a mixed resin; the above-mentioned fluorine-containing dispersion concentrate solution and mixed resin are blended at a mass ratio of 0.2:1 to form a mixed material; the mixed material is placed in 30 ℃ oven, let it stand for 120 hours, and then let it stand for 13 hours at 60°C to form a polytetrafluoroethylene mixture;

[0028] (2) The polytetrafluoroethylene mixture is formed into a cylindrical blank on a compactor at 35°C; the cylindrical blank is formed into a rod on a pusher at 50°C; the rod is rolled at 50°C The polytetrafluoroethylene base tape is formed on the machine; the polytetrafluoroethylene base ta...

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Abstract

The invention discloses a grease-proofing modifying method of a polytetrafluoroethylene cellular material. The grease-proofing modifying method is used for preparing the polytetrafluoroethylene cellular material by the procedures of blending polytetrafluoroethylene resin powder, water-dispersed fluorine-contained dispersing concentrated solution, anhydrous alcohol and aviation kerosene, then extruding, calendaring, lengthways stretching, and thermally forming the blended materials, and the like. According to the grease-proofing modifying method disclosed by the invention, the fluorine-contained dispersing concentrated solution is molten under the effect of an instantaneous high temperature and is transferred onto the surface of the cellular material and joints during the thermal forming process, therefore, the polytetrafluoroethylene cellular material is endowed with high grease proofing performance; with the adoption of the water-dispersed fluorine-contained dispersing concentrated solution, the original properties of the materials can be maintained to the maximum; and the modified polytetrafluoroethylene cellular material can be applied to oil-water separation industries and sea-water desalination industries.

Description

technical field [0001] The invention relates to a method for modifying polytetrafluoroethylene microporous materials, in particular to an oil-proof modification method for polytetrafluoroethylene microporous materials. Background technique [0002] With the rapid development of world industry, environmental pollution is increasing day by day. Facing the globalization of environmental pollution, governments of various countries have successively introduced relevant laws and policies to solve the problem of environmental pollution. The Chinese government even regards sewage treatment and seawater desalination as key support projects during the "Twelfth Five-Year Plan" period. In view of this, water treatment technology, especially membrane water treatment technology has been widely developed. [0003] The key to membrane water treatment is the separation membrane material. The separation membrane made of traditional polymer materials, such as polypropylene, polyvinyl chlorid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D67/00
Inventor 王峰郭玉海朱海霖唐红艳陈建勇张华鹏
Owner ZHEJIANG SCI-TECH UNIV
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