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Preparation method of polytetrafluoroethylene filaments for spunlace filter material reinforced base cloth

A polytetrafluoroethylene and filament technology, used in filament/thread forming, rayon physiotherapy, textiles and papermaking, etc., can solve the problems of low strength and poor evenness, etc. Degree of orientation, effect of continuous unjoint length increase

Active Publication Date: 2016-03-30
灵氟隆新材料科技江苏有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has become the existing typical PTFE paste extrusion spinning method. Although it is simple and easy to implement, the prepared PTFE monofilament has the defects of poor uniformity and low strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Using the primary polytetrafluoroethylene filaments produced by the existing paste extrusion spinning process technology, and then combining two primary polytetrafluoroethylene filaments, sintering, sintering, drafting, and quenching , coiling and other processes, a polytetrafluoroethylene filament with a fineness of 550 deniers for the spunlace filter material reinforced base fabric is made. The specific process parameters are: (1) Combining: the fineness of the circular polytetrafluoroethylene primary growth filament is 550 denier, its continuous length without joint is 4091 meters, its breaking strength is 16.5 Newton, and its evenness is 15%; (2) Sintering: the sintering temperature is 320°C, the feeding speed and output speed are both 15 m / min, and the sintering time is 12 seconds; (3) Sintering drawing: the sintering drawing temperature is 340°C, the feeding The speed is 15 m / min, the output speed is 30 m / min, and the time for passing through the sintering drawing...

Embodiment 2

[0037] Using the primary polytetrafluoroethylene filaments produced by the existing paste extrusion spinning method, the three primary polytetrafluoroethylene filaments are merged, sintered, sintered, drawn, and quenched , coiling and other processes, a polytetrafluoroethylene filament with a fineness of 500 deniers for the spunlace filter material reinforced base fabric is made. The specific process parameters are: (1) Combining: the fineness of the circular polytetrafluoroethylene primary growth filament is 500 deniers, its continuous length without joints is 4500 meters, its breaking strength is 16 Newtons, and its evenness is 16.5%; (2) Sintering: the sintering temperature is 327°C, the feeding speed and output speed are both 13 m / min, and the sintering time is 14 seconds; (3) Sintering drawing: the sintering drawing temperature is 345°C, the feeding The speed is 13 m / min, the output speed is 39 m / min, and the time for passing through the sintering drafting device is 4 sec...

Embodiment 3

[0039] Using the primary polytetrafluoroethylene filaments produced by the existing paste extrusion spinning method, the four primary polytetrafluoroethylene filaments are merged, sintered, sintered, drawn, and quenched , coiling and other processes, a polytetrafluoroethylene filament with a fineness of 450 deniers for the spunlace filter material reinforced base fabric is made. The specific process parameters are: (1) Combining: the fineness of the circular polytetrafluoroethylene primary growth filament is 450 deniers, its continuous length without joints is 5000 meters, its breaking strength is 15.5 Newtons, and its evenness is 18%; (2) Sintering: the sintering temperature is 335°C, the feeding speed and output speed are both 10 m / min, and the sintering time is 18 seconds; (3) Sintering drawing: the sintering drawing temperature is 350°C, the feeding The speed is 10 m / min, the output speed is 40 m / min, and the time for passing through the sintering drawing device is 3.7 sec...

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PUM

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Abstract

The invention relates to a method for preparing a polytetrafluoroethylene filament for spunlace filter material reinforcing base cloth. The method is characterized in that two to four round polytetrafluoroethylene (PTFE) as-spun filaments obtained with the existing technology are combined into a strand firstly, then sintering and sinter-drafting are conducted on the strand obtained after combination to form an integral PTFE sinter-drafted filament, and finally a leafy irregularly-round-shaped PTFE filament for the spunlace filter material reinforcing base cloth is obtained through quenching and coiling. Compared with the prior art, the yarn unevenness of the filament is reduced by 38.9%-46.7%, the breaking strength of the filament is improved by 19.4%-36.4%, the continuous splice-free length of the filament is increased by two to four times, the number of weaving flaws of the base cloth is reduced, entanglement and combination between the filament and fibers in a filter material are enhanced, the overall strength and dedusting efficiency of the filter material are improved, and the service life of the filter material is prolonged. According to the method, existing equipment can be utilized, and production cost is low. The filament prepared with the method is widely applied to the reinforcing base cloth of the dedusting filter material for high-temperature smoke generated by refuse burning and the like.

Description

technical field [0001] The invention relates to a preparation method of polytetrafluoroethylene filaments, in particular to a preparation method of polytetrafluoroethylene filaments used for spunlace filter material reinforced base cloth. The prepared polytetrafluoroethylene filaments are evenly dry, high in breaking strength, and have multi-leaf irregular circular cross-section shapes, which can improve the overall strength, dust removal efficiency and service life of the filter material, and are widely used in steel, cement, garbage Processing of reinforced base cloth in high-temperature flue gas dust removal filter materials in industries such as incineration and biomass material power generation. Background technique [0002] Bag filter is one of the reliable equipment for high-temperature flue gas purification. It is widely used due to its advantages of high dust removal efficiency, large range of particle size, and ability to adapt to harsh working conditions such as h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/253D01D10/00D02J11/00
Inventor 薛刚靳向煜陈明刚刘志瑞吴海波田玉翠王猛
Owner 灵氟隆新材料科技江苏有限公司