Process for preparing polytetrafluoroethylene fibre

A polytetrafluoroethylene and polyvinyl alcohol technology, which is applied in fiber processing, single-component halogenated hydrocarbon rayon, filament/thread forming, etc., can solve the problems of high processing cost, long coagulation time, coagulation tank Long and other problems, to achieve the effect of simplified process, low residual amount, and accelerated removal speed

Inactive Publication Date: 2008-07-30
ZHEJIANG SCI-TECH UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. Due to the large amount of water in the spinning solution, a long coagulation time is required, resulting in a long coagulation tank;
[0007] 3. In the sintering process, it depends entirely on high temperature to remove polyvinyl alcohol, which has the disadvantages of time-consuming and energy-consuming, and the cumbersome and energy-consuming process results in high processing costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment one: the preparation example of polytetrafluoroethylene fiber

[0054] a. Solvent / aqueous solution of polyvinyl alcohol

[0055] Mix 2 kg of methanol and 3.4 kg of water evenly, add 1 kg of polyvinyl alcohol (1788, degree of polymerization 1700, degree of alcoholysis 88%, purchased from Shanxi Vinylon Factory) powder under stirring conditions, add octanol defoamer 0.00076 kilograms (approximately equivalent to 0.02% of the total weight of the spinning solution), continuous stirring, until the polyvinyl alcohol is completely dissolved, obtaining a methanol / water solution of 15.6% polyvinyl alcohol in a concentration by weight;

[0056] b. Preparation of spinning solution

[0057] 1 kg of methanol / water solution of the polyvinyl alcohol (equivalent to 0.156 kg of polyvinyl alcohol dry weight), potassium persulfate 1.56 × 10 -4 kg (equivalent to 0.001 times the dry weight of polyvinyl alcohol), 1.3 kg of polytetrafluoroethylene concentrated dispersion emulsion...

Embodiment 2

[0063] Embodiment two: the preparation example of polytetrafluoroethylene fiber

[0064] a. Solvent / aqueous solution of polyvinyl alcohol

[0065] Mix 2.7 kg each of ethanol and water evenly, add 1 kg of polyvinyl alcohol (2488, degree of polymerization 2400, alcoholysis degree 88%, purchased from Shanghai Jinshu Resin Powder Co., Ltd.) powder under stirring, and continue stirring until The polyvinyl alcohol is completely dissolved to obtain an ethanol / water solution of 15.6% polyvinyl alcohol in a concentration by weight;

[0066] b. Preparation of spinning solution

[0067] 1 kg of ethanol / water solution of the polyvinyl alcohol (equivalent to 0.156 kg of polyvinyl alcohol dry weight), sodium persulfate 1.56 × 10 -3 kg (equivalent to 0.01 times of polyvinyl alcohol dry weight), 3.9 kg of polytetrafluoroethylene concentrated dispersion emulsion (SFN-1, purchased from Zhonghao Chenguang Chemical Research Institute, wherein the weight percentage concentration of polytetrafluo...

Embodiment 3

[0073] Embodiment three: the preparation example of polytetrafluoroethylene fiber

[0074] a. Solvent / aqueous solution of polyvinyl alcohol

[0075] Mix 0.6 kg of acetone and 5.4 kg of water evenly, add 3 kg of polyvinyl alcohol powder (2488, degree of polymerization 2400, degree of alcoholysis 88%, purchased from Shanxi Vinylon Factory) under stirring, and continue stirring until the polyvinyl alcohol powder Alcohol dissolves completely, obtains the acetone / water solution that the weight percent concentration is 33.33% polyvinyl alcohol;

[0076] b. Preparation of spinning solution

[0077] 1 kilogram of acetone / water solution of described polyvinyl alcohol (equivalent to 0.3333 kilograms of polyvinyl alcohol dry weight), ammonium persulfate 1.67 * 10 -3 kg (equivalent to 0.005 times the dry weight of polyvinyl alcohol), 6.66 kg of polytetrafluoroethylene concentrated dispersion emulsion (FR303A, purchased from Shanghai Jinyu Fluorine Chemical Technology Development Co., Lt...

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Abstract

The invention involves a process for preparing of polytetrafluoroethylene fiber. The method mixes and spins the polytetrafluoroethylene condensed dispersed emulsion, solvent / aqueous solution of polyvinyl alcohols and peroxodisulfate, congeals the mixture in borax which is in alkaline condition or boracic acid aqueous solution, and uses the gel formed by polyvinyl alcohol to aggregating the fiber, then prepares the polytetrafluoroethylene fiber through drying, agglutinating and stretching and so on, removes the polyvinyl alcohol rapidly using the characteristic of peroxodisulfate oxygenizing polyvinyl alcohol during the process of high-sintering. The polytetrafluoroethylene fiber prepared by said method is ebony brown, the fiber strength is 1.3-2.3 grams / dan,the gravity is 1.9-2.3 grams / cubic centimeter and the fiber diameter is 15-25 micron. The fibers can be used in filtering carpet widely. Compared with the prior technology, the invention has some advantages such as: the process is short and simple, low-cost, non-polluting; the economic and social benefits are distinctive.

Description

technical field [0001] The present invention relates to a method for preparing polytetrafluoroethylene fibers. Specifically, the present invention relates to a method for rapidly preparing polytetrafluoroethylene fibers. The so-called "fast" is realized by improving the formula of spinning solution and coagulation bath. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/12D01D5/00
Inventor 郭玉海孙润军薛刚来侃陈建勇张昭环冯新星张华鹏
Owner ZHEJIANG SCI-TECH UNIV
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