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An electrospinning device for preparing polytetrafluoroethylene ultrafine fibers

A technology of polytetrafluoroethylene and ultrafine fiber, which is applied in the field of fiber manufacturing, can solve the problems of difficulty in adopting, manufacturing PTFE fiber, and high melt viscosity, and achieve the effects of enhancing stability, increasing strength, and avoiding unstable whipping of jet flow

Active Publication Date: 2018-05-04
江苏金由新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melt viscosity of PTFE is extremely high at 380°C, about 1010 to about 1011Pa·s (about 1010 to about 1011P), so PTFE fibers cannot be produced by melt spinning
In addition, PTFE is almost insoluble in solvents except for special solvents. Therefore, it is difficult to use a simple wet spinning method in which a PTFE solution obtained by dissolving in an appropriate solvent is extruded into a poor solvent bath to solidify it.

Method used

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  • An electrospinning device for preparing polytetrafluoroethylene ultrafine fibers
  • An electrospinning device for preparing polytetrafluoroethylene ultrafine fibers
  • An electrospinning device for preparing polytetrafluoroethylene ultrafine fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of manufacture method of the polytetrafluoroethylene superfine fiber that present embodiment provides, comprises the steps:

[0031] Dissolve polytetrafluoroethylene in the mixed solution of N-methylpyrrolidone and water, add graphene, and disperse evenly by ultrasonic to obtain a spinning fiber with a mass concentration of polytetrafluoroethylene of 60 g / L and a mass concentration of graphene of 10 g / L. liquid;

[0032] After vacuum defoaming the spinning solution, preheat to 50-95°C, according to Figure 1~3 Assemble the electrospinning device (because the remaining parts are conventional techniques in electrospinning, so not shown in the figure), the syringe 1 with the needle 2 is inserted into the ion wind supply device 3, wherein the ion wind supply device 3 includes: a housing, an ion emission source 35 and six blowers 33. The housing includes an outer shell 31 and an inner shell 32. There is a gap between the outer shell 31 and the inner shell 32, and the...

Embodiment 2

[0035] A kind of manufacture method of the polytetrafluoroethylene superfine fiber that present embodiment provides, comprises the steps:

[0036] Dissolving polytetrafluoroethylene in N-methylpyrrolidone, adding graphene and nano-titanium dioxide, and ultrasonically dispersing it uniformly to obtain a spinning solution with a mass concentration of polytetrafluoroethylene of 50 g / L and a mass concentration of graphene of 20 g / L;

[0037] After vacuum defoaming the spinning solution, preheat to 50-95°C, and assemble according to the electrospinning device in Example 1;

[0038] After the electrospinning device is assembled, the following technical parameters are set: the spinning speed is 5.0ml / h, the spinning voltage is 50kV, the needle moving speed is 3cm / min, the distance between the needle and the receiving device is 50cm, and the spinning humidity is 30 %, the spinning temperature is 35° C., the needle moving distance is 30 cm, and electrospinning is started for 3 hours to...

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Abstract

The invention provides a method for manufacturing a polytetrafluoroethylene superfine fiber and an electrostatic spinning device thereof. The method comprises the steps of dissolving polytetrafluoroethylene in N-methyl pyrrolidone, adding graphene, performing ultrasonic dispersion evenly, and obtaining spinning solution; after the spinning solution is defoamed, performing electrostatic spinning at a spinning speed of 3.0-5.0 ml / h and a spinning voltage of 20-25 kV in the presence of ionic wind, and obtaining the polytetrafluoroethylene superfine fiber. The method has the advantages that ions are generated around the position of a pinhole of a needle through the weak ionic wind, the ions neutralize part of electric charges on the jet flow surface, so that the jet flow stability and whipping controllability are enhanced, and not only can instable whipping of jet flow be avoided, but also over-distance orderly output of cellosilk can be performed.

Description

technical field [0001] The invention relates to an electrostatic spinning device for preparing polytetrafluoroethylene superfine fibers, belonging to the technical field of fiber manufacturing. Background technique [0002] Polytetrafluoroethylene fiber (referred to as PTFE), China called fluorine fiber. It is a synthetic fiber made from polytetrafluoroethylene (see fluororesin), with a strength of 17.7-18.5cN / dtex and an elongation of 25%-50%. In its molecular structure, the volume of fluorine atoms is larger than that of hydrogen atoms, and the binding force of fluorine-carbon bonds is also strong, which plays a role in protecting the entire carbon-carbon main chain, making PTFE fibers have excellent chemical stability and excellent corrosion resistance. Compared with other synthetic fiber varieties; the surface of the fiber has a waxy feel and a small friction coefficient; the actual use temperature is 120-180 ° C; it also has good weather resistance and flex resistance,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/48D01F1/10D01D5/00D01D1/10
CPCD01D1/103D01D5/003D01D5/0069D01D5/0076D01D5/0092D01F1/10D01F6/48
Inventor 黄磊顾榴俊钟正平孙玲玲
Owner 江苏金由新材料有限公司
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