Process for manufacturing high-strength low-elongation polytetrafluoroethylene filaments

A polytetrafluoroethylene, high-strength technology, applied in filament/thread forming, stretch spinning, textiles and papermaking, etc., can solve the problems of reduced strength, increased elongation, and large elongation, and achieves Improved density and uniformity, reduced air, and low elongation

Active Publication Date: 2015-01-21
常州华福环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: in the prior art, the PTFE filament produced generally has the problems of low strength and excessive elongation, and all of them have high strength and high elongation; elongation Smaller, the strength is also reduced such a problem

Method used

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  • Process for manufacturing high-strength low-elongation polytetrafluoroethylene filaments
  • Process for manufacturing high-strength low-elongation polytetrafluoroethylene filaments
  • Process for manufacturing high-strength low-elongation polytetrafluoroethylene filaments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Oil supply at low temperature: Put the PTFE dispersion particles with a particle size of 550-560um in a low temperature environment of 2°C for 8 hours, and in this low temperature environment, mix paraffin oil with PTFE The dispersed granules are mixed evenly, wherein the amount of paraffin oil added is 10% of the mass of the polytetrafluoroethylene dispersed granules to obtain the polytetrafluoroethylene mixture processed by low-temperature oiling;

[0031] (2) High-temperature aging: put the polytetrafluoroethylene mixture processed by step (1) low-temperature oiling into a high-temperature environment of 55° C. for aging for 10 hours;

[0032] (3) Vacuum compression molding: put the polytetrafluoroethylene mixture matured in step (2) into the mould, vacuumize, keep the vacuum negative pressure at 0.05MPa, and perform compression molding;

[0033] (4) pushing and extruding: placing the polytetrafluoroethylene compound through compression molding in the step (3) in...

Embodiment 2

[0043] (1) Oiling at low temperature: Put the PTFE dispersion particles with a particle size of 590-600um in a low temperature environment of 0°C for 10 hours, and in this low temperature environment, mix paraffin oil with PTFE The dispersed granules are mixed evenly, wherein the amount of paraffin oil added is 12% of the quality of the polytetrafluoroethylene dispersed granules, and the polytetrafluoroethylene mixture treated with low-temperature oiling is obtained;

[0044] (2) High-temperature aging: put the polytetrafluoroethylene mixture processed by step (1) low-temperature oiling into a high-temperature environment of 58° C. for aging for 7 hours;

[0045] (3) Vacuum compression molding: put the polytetrafluoroethylene mixture matured in step (2) into the mould, vacuumize, keep the vacuum negative pressure at 0.06MPa, and perform compression molding;

[0046] (4) pushing and extruding: placing the polytetrafluoroethylene compound through compression molding in the step ...

Embodiment 3

[0056] (1) Oil supply at low temperature: Put the PTFE dispersion particles with a particle size of 570-580um in a low temperature environment of 5°C for 12 hours, and in this low temperature environment, mix paraffin oil with PTFE The dispersed granules are mixed evenly, wherein the amount of paraffin oil added is 8% of the mass of the polytetrafluoroethylene dispersed granules, and the polytetrafluoroethylene mixture treated with low-temperature oiling is obtained;

[0057] (2) High-temperature aging: put the polytetrafluoroethylene mixture processed by step (1) low-temperature oiling into a high-temperature environment of 52° C. for aging for 10 hours;

[0058] (3) Vacuum compression molding: put the polytetrafluoroethylene mixture matured in step (2) into the mould, vacuumize, keep the vacuum negative pressure at 0.06MPa, and perform compression molding;

[0059] (4) pushing and extruding: placing the polytetrafluoroethylene compound through compression molding in the step...

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Abstract

The invention belongs to the field of polytetrafluoroethylene functional material manufacturing, and particularly relates to a process for manufacturing high-strength low-elongation polytetrafluoroethylene filaments. The process comprises the steps that disperse polytetrafluoroethylene granules are processed in a low-temperature oil supply mode, cured and subjected to vacuum compression molding, material strips are extruded in a pushing and pressing mode, a thin film is obtained through compression, longitudinal heating stretching is conducted twice, the thin film is slit into flat filaments, the flat filaments are twisted into round filaments, heating stretching and forming are conducted on the round filaments, and the PTFE filaments of different specifications are manufactured. The filaments manufactured through the process meet the ideal indexes of high strength and low elongation, thereby being an improvement and breakthrough in the quality of polytetrafluoroethylene filaments.

Description

technical field [0001] The invention belongs to the field of preparation of polytetrafluoroethylene functional materials, in particular to a preparation method of polytetrafluoroethylene filaments with high strength and low elongation. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent characteristics such as temperature resistance, corrosion resistance, aging resistance, non-adhesion, and non-hydrolysis. It is manufactured into filaments and then woven into base fabrics. It is widely used in high temperature resistant and corrosion resistant needles. Needle felt filter material, this filter material is currently used by various chemical industries to meet the emission concentration of gas dust particles < 20mg / Nm 3 filter of choice. This filter material is made into various filter bags, filter plates, filter elements and dust removal equipment to achieve the goal of meeting environmental protection standards. [0003] The working condition of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01D5/12D01D5/42
CPCD01D5/00D01D5/12D01D5/42D01D5/426
Inventor 阙福明潘建农阙建福
Owner 常州华福环境科技股份有限公司
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