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Gel preparation method for polytetrafluoroethylene fibre

A technology of polytetrafluoroethylene and polyvinyl alcohol, which is applied in the direction of spinning solution preparation, conjugated synthetic polymer artificial filament, etc., can solve the problems of unfavorable use and thick fiber, so as to save cost, improve fiber quality, reduce The effect of production costs

Inactive Publication Date: 2007-05-30
ZHEJIANG SCI-TECH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method mainly adopts processes such as drawing and cutting into thin strips and then sintering and stretching. However, the existing drawing and cutting equipment cannot cut the material to a very fine level, so the final fiber is relatively thick, which is not conducive to use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment one: the preparation of polytetrafluoroethylene fiber

[0038] a. Preparation of spinning solution

[0039] 18 kg of polytetrafluoroethylene concentrated dispersion emulsion (FR301G, purchased from Shanghai Jinyu Fluorine Chemical Technology Development Co., Ltd., wherein the weight percent concentration of polytetrafluoroethylene is 60%), and polyvinyl alcohol solid powder (1788, purchased from Shanxi Vinylon Factory) 1 kg of mixing, add 0.0057 kg of tributyl phosphate defoamer (0.03% of the total weight of the spinning solution), add 0.002 kg of borax, use 50 g / liter of sodium hydroxide aqueous solution to adjust pH The value is 11, and the stirring is continued. After about 5 minutes, the viscosity of the system increases suddenly, forming a gel, and obtaining a spinning solution;

[0040] b. Spinning

[0041] The spinning solution is transported to the spinning head by means of gas pressure, metered by a metering pump, and then dry spinning is carried o...

Embodiment 2

[0045] Embodiment two: the preparation of polytetrafluoroethylene fiber

[0046] a. Preparation of spinning solution

[0047] 1 kg of polyvinyl alcohol solid powder (2488, purchased from Shanghai Jinshu Resin Powder Co., Ltd.) was added to 9 kg of water, and the stirring was continued until the polyvinyl alcohol was completely dissolved, and a polyvinyl alcohol aqueous solution with a concentration of 10% by weight was prepared;

[0048] 30 kg of polytetrafluoroethylene concentrated dispersion emulsion (FR303A, purchased from Shanghai Jinyu Fluorine Chemical Technology Development Co., Ltd., wherein the weight percentage concentration of polytetrafluoroethylene is 60%), and the polyvinyl alcohol weight percentage of 10 10 kg of aqueous solution (equivalent to 1 kg of polyvinyl alcohol dry weight) mixed, adding 0.005 kg of borax, using 200 g / liter of sodium hydroxide aqueous solution to adjust the pH value to 10, stirring continuously, the viscosity of the system suddenly incre...

Embodiment 3

[0054] Embodiment three: the preparation of polytetrafluoroethylene fiber

[0055] a. Preparation of spinning solution

[0056] Add 1 kg of polyvinyl alcohol solid powder (1799, purchased from Shanxi Vinylon Factory) into 5.67 kg of water, heat to 95-98 ° C, and keep stirring until the polyvinyl alcohol is completely dissolved, and the polyvinyl alcohol with a concentration of 15% by weight is prepared. Aqueous solution of vinyl alcohol;

[0057] 20 kg of polytetrafluoroethylene concentrated dispersion emulsion (SFN-5A, purchased from Zhonghao Chenguang Chemical Research Institute, wherein the weight percentage concentration of polytetrafluoroethylene is 60%), and the polyvinyl alcohol weight percentage is 15% 6.67 kilograms of aqueous solutions (equivalent to 1 kilogram of polyvinyl alcohol dry weight) are mixed, add 0.01 kilogram of borax, adopt 100 grams per liter of sodium hydroxide aqueous solution to adjust the pH value to 8, keep stirring, and the viscosity of the syst...

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Abstract

The invention relates to a manufacturing method for polytetrafluoroethylene fiber. The method is that ptfe concentration dispersion emulsion and polyvinyl alcohol are mixed; gelling and spinning fluid is produced as the gel is formed by polyvinyl alcohol and borate or borax under the alkaline condition; the mixed fiber of polytetrafluoroethylene and polyvinyl alcohol is obtained by the dried spinning method, and the polytetrafluoroethylene fiber is produced by sintering and drawing so on. The polytetrafluoroethylene fiber produced by said method is provided with good quality and is applied in filtering material widely. Compared with prior technology it is provided with easy technology, low manufacturing method and no-pollution so on.

Description

technical field [0001] The invention relates to a method for preparing polytetrafluoroethylene fibers, in particular, the invention relates to a new method for preparing polytetrafluoroethylene fibers by dry spinning using a gel spinning solution. Background technique [0002] Polytetrafluoroethylene fiber, commonly known as "Fluorolon" or "Teflon" in my country, has excellent heat resistance, chemical corrosion resistance and high strength, and is widely used in many industrial fields. PTFE fibers alone or mixed with glass fibers can be processed into high-temperature resistant filter felts for dust removal that are often used in power plants, metallurgical plants, and cement plants. Among them, the filter mat made of polytetrafluoroethylene fiber mixed with glass fiber can provide a more efficient filtering surface than pure fluorine fiber felt of the same weight; Between the fibers, it can greatly improve the separation efficiency of dust particles in the submicron range...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/04D01D1/02
Inventor 郭玉海来侃孙润军薛刚张昭环冯新星张华鹏陈建勇
Owner ZHEJIANG SCI-TECH UNIV
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