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Preparation method of superfine polytetrafluoroethylene fiber

A technology of polytetrafluoroethylene and polyvinyl alcohol, which is applied in fiber processing, spinning solution preparation, textiles and papermaking, etc. It can solve the problems of inability to produce ultrafine polytetrafluoroethylene fibers and achieve high uniformity of fineness , High temperature and corrosion resistance, high strength

Active Publication Date: 2011-08-31
南京际华三五二一环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of being unable to produce ultrafine polytetrafluoroethylene fibers in the prior art, the purpose of the present invention is to provide a method for preparing ultrafine polytetrafluoroethylene fibers, which uses a unique spinning process to produce ultrafine polytetrafluoroethylene fibers. Fine PTFE fiber, easy to operate, simple and easy to operate, and the obtained ultrafine PTFE fiber has good comprehensive performance

Method used

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  • Preparation method of superfine polytetrafluoroethylene fiber
  • Preparation method of superfine polytetrafluoroethylene fiber
  • Preparation method of superfine polytetrafluoroethylene fiber

Examples

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Embodiment 1

[0027] A preparation method of the ultrafine polytetrafluoroethylene fiber of the present invention, the steps are as follows:

[0028] Preparation of spinning solution 1

[0029] Use polytetrafluoroethylene highly concentrated emulsion, dilute with water to make the viscosity lower than 100cp, add caustic soda to adjust the pH value to 9.

[0030] Preparation of spinning solution 2

[0031] Use polyvinyl alcohol (2488, 1788, etc.) with an alcoholysis degree of 88% to prepare a 15% polyvinyl alcohol solution in cold water, add sulfuric acid to make the pH value at 4, add boric acid at a ratio of 1:100 to facilitate its formation of gel , You can add an appropriate amount of defoamer according to the stirring speed, and the defoamer is simethicone. Static vacuum defoaming for 12 hours for later use.

[0032] Prepare supersaturated coagulation bath

[0033] Dissolve sodium sulfate (glauber's salt) in warm water at 45 degrees Celsius to form a supersaturated solution with cry...

Embodiment 2

[0043] Another kind of preparation method of ultrafine polytetrafluoroethylene fiber, the concrete steps of this method are as follows:

[0044] Preparation of spinning solution 1

[0045] Use polytetrafluoroethylene highly concentrated emulsion, dilute with water to make the viscosity lower than 100cp, add caustic soda to adjust the pH value to 8;

[0046] Preparation of spinning solution 2

[0047] Use alcoholysis degree of 70% polyvinyl alcohol to prepare 10%% polyvinyl alcohol solution in cold water, add sulfuric acid to make the pH value at 3, and add boric acid at a ratio of 1:100, stir to make it form a gel, and then Static vacuum degassing for 10 hours for standby;

[0048] Prepare supersaturated coagulation bath

[0049] Sodium sulfate is dissolved in warm water at 40 degrees Celsius to form a supersaturated solution with crystals, and caustic soda is added to adjust the pH value to 12;

[0050] spinning

[0051] Spinning liquid 1 and spinning liquid 2 pass throu...

Embodiment 3

[0058] Another kind of preparation method of ultrafine polytetrafluoroethylene fiber, the concrete steps of this method are as follows:

[0059] Preparation of spinning solution 1

[0060] Use polytetrafluoroethylene highly concentrated emulsion, dilute with water to make the viscosity lower than 100cp, add caustic soda to adjust the pH value to 10;

[0061] Preparation of spinning solution 2

[0062] Prepare a 120% polyvinyl alcohol solution in cold water with polyvinyl alcohol with a degree of alcoholysis of 90%, add sulfuric acid to make the pH value at 5, and add boric acid at a ratio of 1:100, stir to make it form a gel, and then stand still Vacuum degassing for 15 hours for standby;

[0063] Prepare supersaturated coagulation bath

[0064] Sodium sulfate is dissolved in warm water at 50 degrees Celsius to form a supersaturated solution with crystals, and caustic soda is added to adjust the pH value to 14;

[0065] spinning

[0066] Spinning liquid 1 and spinning liqui...

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Abstract

The invention discloses a preparation method of a superfine polytetrafluoroethylene fiber. The preparation method includes the concrete steps as follows: preparing spinning solution 1 by using polytetrafluoroethylene high-concentration emulsion and adding water for dilution; preparing spinning solution 2 by polyvinyl alcohol with alcoholysis of 70%-80%; dissolving sodium sulfate by warm water at the temperature of 40-50 DEG C to form supersaturated solution with crystals being separated out, and adding caustic soda to adjust the pH value to 12-14 so as to prepare supersaturated coagulating bath; spinning the spinning solution 1 and the spinning solution 2 by a special spinneret plate to form a nascent fiber with a 'sheath core' structure; and sintering and highly stretching the nascent fiber to prepare the superfine polytetrafluoroethylene fiber. In the invention, the superfine polytetrafluoroethylene fiber is produced by a unique spinning process, the operation is convenient, simple and feasible; and the comprehensive performance of the obtained superfine polytetrafluoroethylene fiber is good.

Description

technical field [0001] The invention relates to a method for manufacturing ultrafine polytetrafluoroethylene fibers. Background technique [0002] PTFE fiber has the advantages of corrosion resistance, low friction coefficient and combustion resistance, and has important applications in aerospace, industry, medical treatment and life. Because PTFE is insoluble in solvents, it cannot be formed by solution spinning; due to its high molecular rigidity, it has a high viscosity above the melting point (327°C), does not flow, and only forms a gel, and cannot be formed by melt spinning. At present, there are generally three methods for processing PTFE fibers: emulsion spinning, paste extrusion and cutting. [0003] Emulsion spinning (Miao Jingyuan, Ye Mu, Processing and application of fluoroplastics, Beijing: Chemical Press, 1987, 94; Luo Yifeng, Preparation, properties and applications of fluorine-containing fibers, High-tech fibers and applications, 1999, 24 (5), 21-24,; Wei Zh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/34D01D1/02D01D10/02D02J1/22
Inventor 于淼涵阳建军
Owner 南京际华三五二一环保科技有限公司
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