Polytetrafluoroethylene split-film fiber bundle and preparation process thereof

Abstract

The invention relates to the technical field of fiber production, and discloses a polytetrafluoroethylene film-split fiber bundle which includes the following components: 80 parts of polytetrafluoroethylene dispersion resin and 20 parts of an extrusion aid, and also discloses a preparation process of the polytetrafluoroethylene film-split fiber bundle, the preparation process including the following steps: S1, pasting; S2, extruding, rolling, degreasing and sintering traction; S3, slitting, film cracking and bundling; S4, twisting; S5, hot drawing and filament collecting; and S6, forming. According to the preparation process, the polytetrafluoroethylene dispersion resin and the light alkane-based white extrusion aid are mixed and then subjected to pasting, extrusion, rolling, degreasing, sintering traction, slitting, film cracking and bundling, twisting, hot drawing, filament collecting and forming in sequence, so that fiber bundles have relatively good softness and breaking strength and have certain continuous lengths; filtering cloth woven by the fiber bundles has good filtering efficiency and softness, and the fiber bundles also have good flexibility when being formed in to sewing threads through stranding and woven into a rope.

Description

technical field [0001] The invention relates to the technical field of fiber production, in particular to a polytetrafluoroethylene membrane split fiber bundle and its preparation. Background technique [0002] PTFE fiber has become the preferred material for various industrial fabrics because of its excellent temperature resistance and corrosion resistance. However, although PTFE is a thermoplastic material, due to its physical characteristics of no fluidity in the molten state, the material cannot be produced by melt-blown spinning like most chemical fibers; currently, domestic PTFE fiber material sewing thread mainly uses the following four fiber material production methods: Process 1: monofilament extrusion production process, that is, after mixing PTFE dispersion resin and extrusion aid into paste, through The process of extruding filaments from the cavity, and then degreasing, sintering, and drawing to make filament fibers (monofilaments) is called "extrusion method" ...

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Problems solved by technology

[0003] Among the above four processes, the carbonized viscose cellulose charcoal in the fourth process must be removed by pickling, so acid water pollution is involved in the production, the cost of sewage treatment is high, and it is difficult to meet the discharge standards. It has been approved by the environmental protection department. Strictly restricted, the PTFE brown fiber multifilament used in China basically relies on imports, and the price is nearly one million tons; therefore, at present, a large number of PTFE short fibers and filaments have been widely used in the field of environmental protection filtration in my country Almost all fibers are produced using the first three processes. These processes have mature extrusion aid recovery technology, voc emissions are controllable, and do not affect the environment; however, it is precisely because of the special manufacturing process of PTFE fiber materials Due to limitations, the first two filament production processes can only directly produce monofilaments, and a limited number of multifilaments can be produced through parallel reprocessing. It is impossible to achieve multi-fibers with a single fiber linear density less than 10dtex comparable to process four. Composed of multifilaments, which also restricts the demand for multifilament woven filter cloth in the field of fine chemical liquid filtration, as well as the demand for multifilament flexibility for wire and rope products

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