Dispersion spinning process for poly(tetrafluoroethylene) and related polymers

A technology of tetrafluoroethylene and dispersion, applied in the direction of single-component synthetic polymer rayon, artificial filament made of cellulose derivatives, wet spinning method, etc., can solve problems such as hindering sintering fibers and difficulties

Inactive Publication Date: 2000-01-12
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In most cases, the high concentration of salt in the intermediate fiber structure even prevents the formation of sintered fibers, since it is very difficult, if not impossible, to sinter an intermediate fiber structure containing residual salts

Method used

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  • Dispersion spinning process for poly(tetrafluoroethylene) and related polymers
  • Dispersion spinning process for poly(tetrafluoroethylene) and related polymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] The following Examples 1-15 were tested using the intermediate fiber strength determination method described above.

[0068] Table 1 shows the name of the matrix polymer tested, DS, the weight percent concentration of the matrix polymer in the polymer solution, the viscosity of the matrix polymer solution at 25°C, the weight ratio of PTFE to matrix polymer solids in the intermediate fiber, The composition of the coagulation liquid and the measured value of the strength of the intermediate fiber structure.

[0069]The weight ratio of PTFE to matrix polymer is determined by dividing the weight of solids of polymer particles by the weight of solids of matrix polymer in the spinning mixture. Since the fibers are extruded into the coagulation bath, the entire polymer is converted to fiber solids, so the same ratio represents the composition of the intermediate fiber structure.

[0070] matrix

Sample No.

D.S.

%

matrix

V...

example 16～20

[0085] The solution was prepared as follows: 1.9 kg of the hydroxypropyl cellulose (HPC) of Examples 11, 12 and 13 above were slurried in 15.8 liters of soft water at about 25°C. After the HPC was wetted, 12.3 kg of 23% sodium hydroxide solution was added to the water / HPC mixture. The resulting mixture was stirred under vacuum (approximately 29 mm Hg) for 1 h and then filtered through a 50 μm polypropylene felt bag filter into a membrane degasser operating at approximately 29 mm Hg vacuum. The viscosity of the obtained solution at 25°C was 4,800 mP·s. The above solution stream was combined with a stream of TEF 3311 poly(tetrafluoroethylene) (PTFE) dispersion (supplied by DuPont, Wilmington, DE) with relative flow controlled so that the weight ratio of PTFE solids to HPC solids was 8.2, and the in-line static Mix in a mixer. The resulting mixture was then pumped through a spinneret with 180 holes (6 mil diameter) submerged below the level of the coagulation bath. The coagula...

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Abstract

A process for spinning a fully water washed fluorinated olefinic polymer intermediate fiber structure from a mixture of an aqueous dispersion of particles of the fluorinated olefinic polymer and a solution of a cellulosic ether.

Description

[0001] The present invention relates to a process for spinning dispersions of poly(tetrafluoroethylene) or related polymers into fibers or forming such dispersions into shaped articles, wherein the final sintered fluorinated polymer structure as well as the intermediate structure are substantially Free of process salts, acids and other impurities. Background of the invention [0002] The excellent stability of poly(tetrafluoroethylene) and related polymers to light, heat, solvents, chemical attack, and electrical stress allows the use of such polymers and articles made from such polymers in a variety of The use is quite popular. However, due to the complexities involved in melt and solution processing of such polymers, it is difficult to spin or shape them by conventional methods. [0003] A method for forming or spinning poly(tetrafluoroethylene) and related polymers is to form or spin the polymer from a mixture of the polymer particle aqueous dispersion and viscose, wherein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/06D01F2/28D01F6/12D01F6/48
CPCY10T428/2967D01F6/48D01F6/12Y10T428/2965D01D5/06
Inventor N·L·布朗肯贝克勒J·M·东克尔斯二世W·F·克诺夫
Owner TORAY IND INC
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