Manufacturing technology of high-strength low-elongation polytetrafluoroethylene filaments

A polytetrafluoroethylene, high-strength technology, used in rayon manufacturing, filament/thread forming, single-component halogenated hydrocarbon rayon, etc., can solve the problem of low strength and high elongation of PTFE filament problems, to achieve high strength, low elongation, and reduced air

Inactive Publication Date: 2015-09-09
常州万容新材料科技有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-strength and low-elongation polytetrafluoroethylene filament manufacturing process for the problems that the PTFE filaments produced in the prior art generally have low strength and excessive elongation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] (1) Select polytetrafluoroethylene particles, put the particle raw materials into paraffin oil and store for 8-10 hours, and control the temperature of the paraffin oil at 0°-5°, until the particles and the paraffin oil are mixed evenly, and the low temperature is obtained. Oil treated PTFE compound;

[0024] (2) Put the polytetrafluoroethylene mixture processed by step (1) low-temperature oil feeding into a high-temperature environment of 58°C-60°C for aging for 6-8 hours;

[0025] (3) Put the polytetrafluoroethylene mixture matured in step (2) into the mould, vacuumize and carry out compression molding, and the vacuum negative pressure is ≥0.05MPa;

[0026] (4) placing the polytetrafluoroethylene compound through compression molding in the step (3) in the pushing die cavity to push and continuously extrude the material strip, the cross section of the control material strip is oblate;

[0027] (5) Feed the strip extruded in step (4) into the calender, extrude the film...

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PUM

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Abstract

The invention belongs to the field of preparation of polytetrafluoroethylene functional materials and provides a manufacturing technology of high-strength low-elongation polytetrafluoroethylene filaments to solve the problems that the PTFE (polytetrafluoroethylene) filaments produced in the prior art generally are of low strength and excessively high elongation. The manufacturing technology includes: low-temperature oil treatment, curing treatment, compression molding, strip extruding, thermal elongating, slitting, filament manufacturing, and drawing and setting. The high-strength low-elongation polytetrafluoroethylene filaments are of strength up to 48-52 CN/tex and elongation at break, only 6% to 10%, the ideal indexes, high strength and low elongation, are achieved, and improvement and breakthrough on the quality of the polytetrafluoroethylene filaments are made; by the use of vacuum compression molding, the air in formed plastic is greatly reduced, the semi-finished products are higher in density and uniformity, and the manufacturing technology plays a key role in improving the quality of products made by the following pushing and rolling process.

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 high 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 and corrosion resistant needles. Needle felt filter material, this filter material is currently the preferred filter material for all kinds of chemical industry emissions to meet the emission concentration of gas dust particles <20mg / Nm3. 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/48D01F1/10D01D13/00D01D5/42
Inventor 王国芳
Owner 常州万容新材料科技有限公司
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