Method for preparing polytetrafluoroethylene superfine fiber

A polytetrafluoroethylene, ultra-fine fiber technology, used in fiber processing, spinning solution preparation, single-component halogenated hydrocarbon rayon, etc.

Inactive Publication Date: 2011-03-30
TORAY FIBER RES INST(CHINA) CO LTD
View PDF0 Cites 70 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of polyvinyl alcohol in the polytetrafluoroethylene / polyvinyl alcohol emulsion used by Sun Chuiqing and others is very high, and what is prepared is not pure polytetrafluoroethylene fiber, but polytetrafluoroethylene / polyvinyl alcohol blended fiber mat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing polytetrafluoroethylene superfine fiber
  • Method for preparing polytetrafluoroethylene superfine fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, the preparation example of polytetrafluoroethylene superfine fiber

[0029] a. Preparation of spinning solution

[0030] First, 10.9 grams of polyvinyl alcohol was added into 88.1 grams of water, and heated and mechanically stirred to completely dissolve it to obtain an aqueous solution of polyvinyl alcohol. The used polyvinyl alcohol is a commercially available product, the degree of polymerization is 1700-1800, and the degree of alcoholysis is 88%-99%. To adjust the volatility of this solution, add 1 g of ethanol during stirring to make ethanol / water solution of polyvinyl alcohol. The ethanol / water solution of the obtained polyvinyl alcohol and the weight percent concentration are 60%, and the polytetrafluoroethylene particle size is 200nm polytetrafluoroethylene concentrated dispersion emulsions are mixed uniformly by weight ratio 1: 1, after static defoaming, obtain spinning solution;

[0031] b. Electrospinning

[0032] The spinning liquid that st...

Embodiment 2

[0035] Embodiment 2, the preparation example of polytetrafluoroethylene superfine fiber

[0036] a. Preparation of spinning solution

[0037] First, 10 grams of polyvinyl alcohol was added into 90 grams of water, and heated and mechanically stirred to completely dissolve it to obtain an aqueous solution of polyvinyl alcohol. The aqueous solution of polyvinyl alcohol and the polytetrafluoroethylene concentrated dispersion emulsion with a weight percentage concentration of 60% and a polytetrafluoroethylene particle size of 250nm are mixed uniformly in a weight ratio of 1:1, and left to stand for defoaming to obtain spinning liquid;

[0038] b. Electrospinning

[0039] The spinning solution that step A obtains is injected into electrospinning device (such as figure 1 In the feeding device as shown), adjust the feeding rate of the spinning solution to be 100ul / min; the distance between the spinneret of the feeding device and the grounded collector is 20cm; turn on the high volt...

Embodiment 3

[0042] Embodiment 3, the preparation example of polytetrafluoroethylene superfine fiber

[0043] a. Preparation of spinning solution

[0044] First, 6 grams of polyvinyl alcohol was added into 93 grams of water, and heated and mechanically stirred to completely dissolve it to obtain an aqueous solution of polyvinyl alcohol. To adjust the volatility of the solution, add 1 g of ethanol during stirring to make an ethanol / water solution of polyvinyl alcohol. The aqueous solution of the prepared polyvinyl alcohol and the polytetrafluoroethylene concentrated dispersion emulsion with a weight percentage concentration of 60% and a polytetrafluoroethylene particle size of 10 nm are mixed uniformly in a weight ratio of 1:1, and left standing for defoaming to obtain a spinning liquid;

[0045] b. Electrospinning

[0046] The spinning solution that step A obtains is injected into electrospinning device (such as figure 1 In the feeding device as shown), adjust the feeding rate of the s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing a polytetrafluoroethylene superfine fiber, comprising the following steps of: firstly dissolving polyvinyl alcohol into water to prepare a polyvinyl alcohol solution, then evenly mixing the polyvinyl alcohol solution with polytetrafluoroethylene concentrated dispersion to prepare a spinning solution; then making the spinning solution into a polytetrafluoroethylene / polyvinyl alcohol superfine fiber by adopting an electrostatic spinning method; and finally, carrying out polyvinyl alcohol removal aftertreatment on the prepared polytetrafluoroethylene / polyvinyl alcohol superfine fiber to obtain the polytetrafluoroethylene superfine fiber. The prepared polytetrafluoroethylene superfine fiber is white or dark brown, and the diameter of the fiber is 30-2000nm.

Description

technical field [0001] The invention belongs to the field of ultrafine fiber preparation, and in particular relates to a technology for preparing polytetrafluoroethylene (PTFE) ultrafine fibers through an electrospinning method. Background technique [0002] PTFE has a wide range of operating temperature (-250 ~ 260 ℃), good chemical stability, excellent dielectric properties, self-lubrication and anti-sticking properties, and a series of unique properties, and its application range is extremely wide. Due to the large molecular weight of polytetrafluoroethylene, high crystallinity, and high melting point; and a layer of fluorine atom shell around the C-C main chain acts as a shield to prevent the intrusion of various reagents. Therefore, there is no one below 300 ° C. Solvents can dissolve and swell it. In addition to metal sodium (molten state), fluorine atoms and certain chlorides, it is resistant to various strong acids, strong alkalis, oils, organic solvents and strong ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00D01D1/02D01D10/06D01D10/02D01F6/12
Inventor 朱思君周元元吴刚
Owner TORAY FIBER RES INST(CHINA) CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap