Method for preparing polytetrafluoroethylene fiber by wet spinning

A polytetrafluoroethylene and polytetrafluoroethylene spinning technology, applied in wet spinning, fiber treatment, fiber chemical characteristics, etc., to achieve the effect of not easy to break, avoid sticking, and continuous spinning

Active Publication Date: 2022-04-26
JIHUA LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present disclosure provides a method for preparing polytetrafluoroethylene fibers by wet spinning. The present disclosure utilizes wet spinning to prepare polytetrafluoroethylene fibers. There are no silk holes, and there is no adhesion between the primary fibers, and at the same time, it is not easy to break the filaments during the drawing process, which can realize continuous spinning, and finally can obtain micron-sized PTFE fibers

Method used

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  • Method for preparing polytetrafluoroethylene fiber by wet spinning
  • Method for preparing polytetrafluoroethylene fiber by wet spinning
  • Method for preparing polytetrafluoroethylene fiber by wet spinning

Examples

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Embodiment 1

[0052] This embodiment provides a method for preparing polytetrafluoroethylene fibers by wet spinning.

[0053] (1) Dissolve 6g of sodium alginate with M:G ratio of 1:2 in 194g of deionized water at 70°C, cool to room temperature and add 0.1g of non-ionic silicone defoamer and polytetrafluoroethylene dispersion ( The massfraction of polytetrafluoroethylene dispersion liquid is 60%, promptly contains polytetrafluoroethylene (72g) 120g mixes in 120g, prepares the spinning solution that polytetrafluoroethylene mass concentration is 22.5%;

[0054] (2) The spinning solution is wet-spun with a spinning temperature of 25°C and a spinneret hole diameter of 70 μm, and then molded in a calcium chloride coagulation bath with a mass fraction of 1% ethanol at a temperature of 25°C to obtain a primary fiber;

[0055] (3) After washing the as-spun fiber, disperse it with an aluminum sulfate solution with a concentration of 2%, then wash it with ethanol, dry it at 100°C, and sinter it at 36...

Embodiment 2

[0058] This embodiment provides a method for preparing polytetrafluoroethylene fibers by wet spinning.

[0059] The difference from Example 1 is that in this example, the dispersion is carried out with white oil.

[0060] figure 2 This is the metallographic optical microscope image of the polytetrafluoroethylene fiber obtained in this example. It can be seen from the figure that the diameter of the polytetrafluoroethylene fiber obtained in this example is 36.88 μm.

Embodiment 3

[0062] This embodiment provides a method for preparing polytetrafluoroethylene fibers by wet spinning.

[0063] The difference from Example 1 is that in this example, ethanol is not added to the coagulation bath.

[0064] In this example, when ethanol is not added to the coagulation bath, there will be a phenomenon of uneven sintering on the fiber surface. From the comparison of Example 1 and Example 3, it can be seen that adding ethanol to the coagulation bath can regulate the interfiber ions The exchange rate makes the exchange rate tend to be moderate, and the surface of the sintered fiber is more uniform.

[0065] image 3 This is the metallographic optical microscope image of the polytetrafluoroethylene fiber obtained in this example. It can be seen from the figure that the diameter of the polytetrafluoroethylene fiber finally obtained in this example is 35.33 μm.

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Abstract

The invention relates to a method for preparing polytetrafluoroethylene fibers by utilizing wet spinning, which comprises the following steps: carrying out wet spinning and solidification on a polytetrafluoroethylene spinning solution to obtain nascent fibers, and carrying out post-treatment on the nascent fibers to obtain the polytetrafluoroethylene fibers, the spinning solution also contains sodium alginate with the ratio of M to G being 1: (1-3). The polytetrafluoroethylene fiber is prepared by utilizing a wet spinning method, the nascent fibers do not block spinneret orifices after being solidified, the nascent fibers do not adhere to one another, meanwhile, the phenomenon of yarn breakage is not prone to occurring in the forming and washing process, continuous spinning can be achieved, and finally the micron-sized polytetrafluoroethylene fiber can be obtained.

Description

technical field [0001] The present disclosure relates to the technical field of wet spinning, in particular to a method for preparing polytetrafluoroethylene fibers by wet spinning, in particular to a method for preparing polytetrafluoroethylene fibers by wet spinning and the resulting Micron PTFE fibers. Background technique [0002] PTFE has outstanding chemical stability, excellent high and low temperature performance and corrosion resistance, and is widely used in chemical industry, petroleum, textile, electronics and machinery and other industrial fields. At the same time, due to the strong hydrophobicity and porosity of PTFE, it becomes an ideal material for preparing waterproof and breathable textile fibers. [0003] The "insoluble and non-melting" characteristics of PTFE make its processing performance very poor, and it cannot be made into fibers or hollow fiber membranes through conventional solution spinning and melt spinning. At present, carrier spinning is one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/06D01D10/00D01F8/10D01F8/18
CPCD01D5/06D01D10/00D01F8/10D01F8/18D10B2321/042
Inventor 舒溪李小磊伍德民
Owner JIHUA LAB
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