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Preparation method of polytetrafluoroethylene ultra-thin filament

A PTFE, slender technology, applied in filament/thread forming, one-component halogenated hydrocarbon artificial filament, textile and papermaking, etc., can solve the problem of low shrinkage, easy broken filaments, PTFE Vinyl fibers are prone to burrs and other problems, and achieve the effects of stable elongation at break, improved tensile strength, and low thermal shrinkage

Active Publication Date: 2021-06-22
SHANDONG SENRONG PLASTIC IND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the preparation of ultra-fine PTFE fibers with a length ≥ 5000 meters, there is no good method at present. It is difficult to ensure that PTFE fiber is prepared by the above method. The uniformity of vinyl fiber length and linear density is prone to broken filaments; when high tensile strength is reached, PTFE fibers are prone to burrs, and it is difficult to ensure that the elongation at break index reaches the standard while ensuring low shrinkage

Method used

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  • Preparation method of polytetrafluoroethylene ultra-thin filament

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Comparison scheme
Effect test

Embodiment 1

[0050] The preparation method of the polytetrafluoroethylene ultrafine filament described in the present embodiment 1 is made up of the following steps:

[0051] (1) Store the polytetrafluoroethylene dispersed particles in a low-temperature environment for a period of time, and mix them with additive oil in proportion after screening to obtain a polytetrafluoroethylene mixture treated with low-temperature oil, and seal it after screening again spare;

[0052] (2) maturing the polytetrafluoroethylene mixture prepared in step (1) in a high-temperature environment, and then compression molding;

[0053] (3) placing the polytetrafluoroethylene mixture molded in step (2) in a pushing die cavity with a compression ratio of 260 to push and continuously extrude the strip to obtain a polytetrafluoroethylene strip;

[0054] (4) Feed the polytetrafluoroethylene strip through the guide plate into the calender to extrude the film, and the film is degreased through heat treatment;

[0055...

Embodiment 2

[0074] The preparation method of the polytetrafluoroethylene ultrafine filament described in the present embodiment 2 is made up of the following steps:

[0075] (1) Store the polytetrafluoroethylene dispersed particles in a low-temperature environment for a period of time, and mix them with additive oil in proportion after screening to obtain a polytetrafluoroethylene mixture treated with low-temperature oil, and seal it after screening again spare;

[0076] (2) maturing the polytetrafluoroethylene mixture prepared in step (1) in a high-temperature environment, and then compression molding;

[0077] (3) placing the polytetrafluoroethylene mixture molded in step (2) in a pushing die cavity with a compression ratio of 260 to push and continuously extrude the strip to obtain a polytetrafluoroethylene strip;

[0078] (4) Feed the polytetrafluoroethylene strip through the guide plate into the calender to extrude the film, and the film is degreased through heat treatment;

[0079...

Embodiment 3

[0098] The preparation method of the polytetrafluoroethylene ultrafine filament described in the present embodiment 3 is made up of the following steps:

[0099] (1) Store the polytetrafluoroethylene dispersed particles in a low-temperature environment for a period of time, and mix them with additive oil in proportion after screening to obtain a polytetrafluoroethylene mixture treated with low-temperature oil, and seal it after screening again spare;

[0100] (2) maturing the polytetrafluoroethylene mixture prepared in step (1) in a high-temperature environment, and then compression molding;

[0101] (3) placing the polytetrafluoroethylene mixture molded in step (2) in a pushing die cavity with a compression ratio of 260 to push and continuously extrude the strip to obtain a polytetrafluoroethylene strip;

[0102] (4) Feed the polytetrafluoroethylene strip through the guide plate into the calender to extrude the film, and the film is degreased through heat treatment;

[0103...

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Abstract

The invention belongs to the technical field of polytetrafluoroethylene fiber preparation, and particularly relates to a preparation method of a polytetrafluoroethylene ultra-thin filament. The preparation method comprises the steps of carrying out low-temperature treatment on polytetrafluoroethylene dispersed granules, mixing the treated polytetrafluoroethylene dispersed granules with auxiliary oil, curing, and carrying out compression molding; putting the polytetrafluoroethylene mixture into a pushing and pressing die cavity with the compression ratio of 260, pushing and pressing, and continuously extruding strips to obtain polytetrafluoroethylene material strips; pressing the polytetrafluoroethylene material strips into a film, and performing heat treatment to remove oil; stretching the de-oiled film for multiple times to obtain a polytetrafluoroethylene film; longitudinally cutting the polytetrafluoroethylene film into a plurality of flat filaments, heating and stretching, preparing the obtained filaments into round filaments in a secondary twisting manner, performing twisting and setting while quickly cooling, and finally winding the filaments on a shaft through a winding drum to prepare the polytetrafluoroethylene ultra-thin filament. The polytetrafluoroethylene ultra-thin filament prepared by the preparation method disclosed by the invention is high in strength, uniform in linear density, free of burrs and low in shrinkage rate.

Description

technical field [0001] The invention belongs to the technical field of polytetrafluoroethylene fiber preparation, and in particular relates to a preparation method of polytetrafluoroethylene ultrafine filaments. Background technique [0002] Due to its special structure, PTFE is not suitable for making fibers by usual solution spinning and melt spinning. So far, there are three commonly used production methods for PTFE fibers: emulsion spinning, paste extrusion, and film splitting. [0003] (1) Emulsion spinning, also known as carrier spinning, is currently the most mature method for producing PTFE fibers. It often uses viscose or polyvinyl alcohol aqueous solution that is easy to form fibers as a carrier, and is mixed with PTFE emulsion Uniform, spinning according to the conventional wet spinning method, the formed fiber is sintered at a high temperature of 380-400°C after washing and drying, so as to remove the carrier part, and then sinter the PTFE that has been bonded a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/42D01H7/86D01F6/12
CPCD01D5/426D01H7/86D01F6/12
Inventor 谷圣萍
Owner SHANDONG SENRONG PLASTIC IND TECH
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