Polytetrafluoroethylene filament as well as preparation method and application thereof

A polytetrafluoroethylene and filament technology, which is applied in the field of polytetrafluoroethylene filament and its preparation, can solve problems such as uneven strength and poor evenness, and achieve reduced strength loss rate, low production cost, and stable dimensions good sex effect

Inactive Publication Date: 2017-09-19
上海灵氟隆新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor uniformity and uneven strength of the polytetrafluoroethylene filaments used in the prior art for needle-punched filter material reinforcement base cloth, and to provide a polytetrafluoroethylene Ethylene filament and its preparation method and application

Method used

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  • Polytetrafluoroethylene filament as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The preparation process of polytetrafluoroethylene filament is as follows:

[0058] (1) Lamination and degreasing: Two layers of PTFE calendered base tapes (0.25mm in thickness and 23cm in width) are alternately unwound and stacked clockwise and counterclockwise respectively, and fed to the roller degreasing and bonding device, Carry out overlapping degreasing;

[0059] Among them, through the tension device and the correction device, the two layers of calendered base belts are aligned and completely bonded to form a two-layer laminated base belt; Oil time is 6 seconds;

[0060] (2) Carry out two longitudinal heating and drawing of the two-layer laminated base belt after lamination and degreasing in step (1): the first drawing temperature is 200°C, the feeding speed is 6m / min, and the output speed is 12m / min ;The second drawing temperature is 275°C, the feeding speed is 2m / min, and the output speed is 10m / min;

[0061] (3) The two-layer laminated base tape after step...

Embodiment 2

[0067] The preparation process of polytetrafluoroethylene filament is as follows:

[0068] (1) Lamination and degreasing: Three-layer PTFE calendered base tape (thickness 0.25mm, width 23cm) is alternately unwound and stacked clockwise and counterclockwise respectively, and fed to the roller degreasing and bonding device, Carry out overlapping degreasing;

[0069] Among them, the three-layer calendered base belt is aligned and fully bonded to form a three-layer laminated base belt through the tension device and the correction device; Oil time is 5 seconds;

[0070] (2) The three-layer laminated base belt after step (1) laminated and degreased is subjected to longitudinal heating and drawing twice: the first drawing temperature is 210°C, the feeding speed is 6m / min, and the output speed is 12m / min ;The second drawing temperature is 285°C, the feeding speed is 2m / min, and the output speed is 12m / min;

[0071] (3) The three-layer laminated base tape after step (2) is heated an...

Embodiment 3

[0077] (1) Lamination and degreasing: Three-layer PTFE calendered base tape (thickness 0.25mm, width 23cm) is alternately unwound and stacked clockwise and counterclockwise respectively, and fed to the roller degreasing and bonding device, Carry out overlapping degreasing;

[0078] Among them, the three-layer calendered base belt is aligned and fully bonded to form a three-layer laminated base belt through the tension device and the correction device; Oil time is 7 seconds;

[0079] (2) The three-layer laminated base belt after step (1) laminated and degreased is subjected to longitudinal heating and drawing twice: the first drawing temperature is 190°C, the feeding speed is 4m / min, and the output speed is 8m / min ;The second drawing temperature is 260°C, the feeding speed is 3m / min, and the output speed is 12m / min;

[0080] (3) The three-layer laminated base tape after step (2) is heated and drawn is cut into 32 flat filaments in a cutting device;

[0081] (4) the flat wire...

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Abstract

The invention discloses a polytetrafluoroethylene filament as well as a preparation method and an application thereof. The preparation method comprises the following steps: (1) performing superposition and oil removal on a plurality of layers of single-layer polytetrafluoroethylene rolling base tapes so as to form a multilayer superposed base tape; (2) longitudinally heating and drafting twice; (3) slitting into ribbon-like filaments; (4) sintering and drafting the ribbon-like filaments; and (5) twisting the ribbon-like filaments to obtain round filaments, setting, and performing shock cooling so as to obtain the product; or setting the ribbon-like filaments, performing shock cooling, twisting, thereby obtaining the product. The filament made by the method disclosed by the invention is low in unevenness, high in breaking strength and low in elongation, the overall strength of a filter material can be improved, and the service life of the filter material is prolonged; meanwhile, the breakage can be reduced due to high strength, and the production efficiency is improved; the polytetrafluoroethylene filament can be directly produced by using the conventional production equipment, is low in production cost and smooth and even in filament surface and contributes to weaving, and the woven base cloth can be widely applied to framework materials of high-temperature flue gas dust-removing filter materials in industries such as steel, waste incineration, cement, power plants and the like.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene filament and its preparation method and application. Background technique [0002] Bag filter is one of the reliable equipment for high-temperature flue gas purification and one of the effective equipment for ultra-clean emission. It has the advantages of high dust removal efficiency, wide range of particle size, complex working conditions and long service life, so it is Widely used in various industrial fields. As the core component of the bag filter, the performance of the filter material directly restricts the overall performance of the bag filter. At present, the commonly used filter materials are composite materials reinforced by needle punching or hydroentanglement. The base fabric is used as the skeleton material of the filter material, which makes the filter material have the characteristics of high strength and low elongation, so the strength and elongation of the filter material are determi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/12D01F6/12
CPCD01D5/12D01F6/12
Inventor 薛士临陈银青张建军王猛
Owner 上海灵氟隆新材料科技有限公司
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