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Preparation method of PTFE (Polytetrafluoroethylene) short fiber

A technology of PTFE and short fiber, which is applied in the field of preparation of PTFE fiber, can solve the problem of uneven coating of inorganic metal powder, achieve the effect of increasing the density of the blank, reducing the number of voids, and improving the antistatic performance

Pending Publication Date: 2022-04-19
浙江赛迅环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this preparation method requires high processing technology for inorganic powder and polytetrafluoroethylene film production. For example, the inorganic metal powder must reach the nanometer level, and the ratio between the inorganic metal powder and the film must be strictly controlled. And it is still unavoidable to avoid the problem of uneven coating of inorganic metal powder on the film

Method used

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  • Preparation method of PTFE (Polytetrafluoroethylene) short fiber

Examples

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preparation example Construction

[0023] A kind of preparation method of PTFE short fiber provided by the invention comprises the following steps:

[0024] (1) Pretreatment: Add PTFE particles to the pretreatment agent and mix, wash and dry to obtain composite PTFE powder; wherein, the pretreatment agent includes aniline derivative / polyvinyl alcohol compound;

[0025] (2) Compact: Form a blank from composite PTFE powder at 250~300°C;

[0026] (3) Fabrication of fibers: processing blanks to form fibers by slit film method.

[0027] The above preparation method also includes the following process: after the pretreatment of the PTFE particles, pour them into the mixing tank, add kerosene for mixing, and the ratio of kerosene consumption to the total pellet weight is 40:17~20; after the mixing is completed, put it into a 45°C incubator Insulation and static treatment, the standing time is 12h; after the compact is completed, the billet is water-cooled to cool down; the above-mentioned film cutting method includes...

Embodiment 1

[0029] In this example, the raw materials for the preparation of the aniline derivative / polyvinyl alcohol complex include: N-phenyl-p-phenylenediamine (purity 98%), succinic anhydride (purity 99%), p-chloromethylbenzene Ethylene (purity 99%, containing 100ppm p-tert-butylcatechol stabilizer), tetramethylguanidine (purity 99%), N-n-butylmaleimide (prepared by the reaction of maleic anhydride and n-butylamine , in light yellow oil), azobisisobutyronitrile (purity 98%).

[0030] The preparation method of the preparation of described aniline derivative / polyvinyl alcohol compound is as follows:

[0031] Synthesis of intermediates: Add N-phenyl-p-phenylenediamine (18.42g, 0.1mol) and succinic anhydride (10.0g, 0.1mol) into 600ml of dichloromethane solvent, stir for 12h and filter with suction, collect the gray precipitate and use Wash with ether until the filtrate is colorless, then dry at 40°C to obtain the intermediate;

[0032] Synthesis of monomers: Mix the intermediate (5.68g...

Embodiment 2

[0037] The difference between this example and Example 1 is that the preparation of the aniline derivative / polyvinyl alcohol complex is different, including: pre-preparing polyvinyl alcohol into a polyvinyl alcohol film, and then adding 10 mg to Example 1 to obtain 10 ml Mix and stir in the mixed solution for 6 hours, then take out the polyvinyl alcohol film, wash and dry, and then pulverize to a range of 1-100 μm to obtain a composite.

[0038] In this embodiment, although polyvinyl alcohol has excellent hydrophilicity and dispersibility, the viscosity of polyvinyl alcohol aqueous solution is relatively large, and the styrene monomer containing aniline dimer and N-n-butylmaleimide The degree of freedom is limited in the polyvinyl alcohol solution, which may affect the effect of the polymerization reaction. Therefore, in this embodiment, the polyvinyl alcohol film is used as the matrix to make the styrene monomer containing aniline dimer and N- n-Butylmaleimide is polymerized ...

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Abstract

The invention relates to a preparation method of PTFE short fibers. The preparation method comprises the following steps: (1) pretreatment: adding PTFE particles into a pretreatment agent, mixing, washing and drying to obtain composite PTFE powder; wherein the pretreatment agent comprises an aniline derivative / polyvinyl alcohol compound; (2) blank pressing is conducted, specifically, the composite PTFE powder is made into a blank at the temperature of 250-300 DEG C; and (3) preparing fibers: processing the blank by a film cutting silk method to form the fibers. According to the present invention, the pretreatment agent different from the existing preparation process is provided, such that the melting temperature of the PTFE particles can be reduced during the PTFE particle melting blank making, the energy consumption can be reduced, and the prepared fiber has good antistatic property and good mechanical property.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of PTFE fibers, and in particular relates to a preparation method of PTFE short fibers. Background technique [0002] PTFE is excellent in various properties such as heat resistance, light resistance, chemical resistance, electrical insulation, and sliding properties, so it is used in a wide range of fields mainly in the mechanical, chemical, and electrical fields. One of articles containing PTFE (PTFE article) is PTFE fiber, and PTFE fiber is expected to be used in various fields based on the above-mentioned various characteristics of PTFE. Conventionally, an emulsion spinning method and a slit yarn method are known as methods for producing PTFE fibers. [0003] The main steps of the emulsion spinning method are to add matrix materials such as viscose or cellulose to the dispersion of PTFE particles to obtain a spinning stock solution, extrude the stock solution into a coagulation ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/48D01F1/10D01F1/09D01D5/42
CPCD01F6/48D01F1/10D01F1/09D01D5/426
Inventor 施亦斐彭佳建徐掌平余红芳
Owner 浙江赛迅环保科技有限公司
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