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Preparation method of polytetrafluoroethylene chopped fiber

A technology of polytetrafluoroethylene and polytetrafluoroethylene tape, which is used in fiber processing, textile and papermaking, single-component halogenated hydrocarbon rayon, etc., can solve the problem of unstable fiber strength and strength uniformity index, and fiber breakage. The elongation index is unstable, and the fixed-length fiber gram weight is not easy to reduce, so as to achieve the effects of low production cost, high production rate and convenient operation.

Inactive Publication Date: 2011-05-25
宋朋泽
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing technique of existing polytetrafluoroethylene fiber, such as patent No. is zl200610026648.1, and the polytetrafluoroethylene fiber produced by the manufacturing method of a kind of polytetrafluoroethylene long fiber by name has following shortcoming: 1, the strong strength of fiber 2. The elongation at break index of the fiber is unstable, the uniformity of the material property, the uniformity of the fixed weight and other indicators are unstable; 3. The gram weight of the fixed-length fiber is not easy to reduce

Method used

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  • Preparation method of polytetrafluoroethylene chopped fiber
  • Preparation method of polytetrafluoroethylene chopped fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055]Mix polytetrafluoroethylene micropowder and aviation kerosene at a weight ratio of 39:11; stir the mixed raw materials at a stirring speed of 2r / min, a stirring temperature of 20°C, and a stirring time of 90 minutes, so that the raw materials are fully mixed.

[0056] Place the stirred mixed raw materials at a temperature of 40°C and let them stand for 48 hours to facilitate the comprehensive absorption of the lubricant by the polytetrafluoroethylene micropowder, so that the two can be fully mixed to make the prefabricated material required for processing.

[0057] Put the prefabricated material into the pre-pressing machine for pre-compression, the pressure is 0.5MPa, the pressing temperature is 20 ℃, and the prefabricated molding material is made; then the prefabricated molded product is put into the pusher for pressing, the pressing temperature is 160 ℃, the pressure is 3.5MPa, and then made into a columnar mold material.

[0058] The cylindrical mold material was cal...

Embodiment 2

[0068] Mix the polytetrafluoroethylene micropowder and aviation kerosene in a weight ratio of 81:19; stir the mixed raw materials at a stirring speed of 4r / min, a stirring temperature of 25°C, and a stirring time of 100min, so that the raw materials are fully mixed.

[0069] Place the stirred mixed raw materials at a temperature of 50°C for 50 hours to facilitate the comprehensive absorption of the lubricant by the polytetrafluoroethylene micropowder, so that the two can be fully mixed to make the prefabricated material required for processing.

[0070] Put the prefabricated material into the pre-pressing machine for pre-compression, the pressure is 0.6MPa, the pressing temperature is 25°C, and the prefabricated molding material is made; then the prefabricated molding is put into the pusher for pressing, the pressing temperature is 170°C, and the pressure is 3.8MPa, and then made into a columnar mold material.

[0071] The cylindrical mold material was calendered and pressed a...

Embodiment 3

[0081] Mix polytetrafluoroethylene micropowder and aviation kerosene at a weight ratio of 21:4; stir the mixed raw materials at a stirring speed of 5 r / min, a stirring temperature of 30°C, and a stirring time of 120 min, so that the raw materials are fully mixed.

[0082] Place the stirred mixed raw materials at a temperature of 60°C for 60 hours to facilitate the comprehensive absorption of the lubricant by the polytetrafluoroethylene micropowder, so that the two can be fully mixed to make the prefabricated material required for processing.

[0083] Put the prefabricated material into the pre-pressing machine for pre-compression, the pressure is 0.8MPa, the pressing temperature is 30°C, and the prefabricated molding material is made; then the prefabricated molded product is put into the pusher for pressing, the pressing temperature is 180°C, and the pressure is 4.2MPa, and then made into a columnar mold material.

[0084] The cylindrical mold material was calendered and press...

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Abstract

The invention aims to provide polytetrafluoroethylene chopped fiber with high intensity, high uniformity and low production cost and preparation technology thereof. A process flow comprises the following steps of: mixing polytetrafluoroethylene micro powder and a lubricating agent; stirring; standing; performing pre-compression molding; performing push molding; performing rolling molding; drying; performing hot stretching; parting off; twisting; performing primary hot drawing; performing secondary hot drawing; curling and thermally forming; cutting off; loosening; and inspecting and packaging so as to obtain high-intensity polytetrafluoroethylene chopped fiber. In a manufacturing process, the temperature rises gradually from the primary hot stretching to the secondary hot stretching to the curling and thermally forming.

Description

technical field [0001] The invention relates to a method for manufacturing polytetrafluoroethylene fibers, in particular to a method for manufacturing polytetrafluoroethylene short fibers. Background technique [0002] PTFE fiber is a polymer thermoplastic material. Because of its unique perfluorocarbon molecular structure, PTFE has the advantages of corrosion resistance, high and low temperature resistance, low friction coefficient, non-combustibility (LOI is 95%), etc. It is widely used in aerospace, industry, medical and life. important application. Especially with the rapid development of modern industrialization, air pollution has become an increasingly serious global problem, and the treatment of pollutants has become a major issue, which requires higher performance of filter materials. Compared with existing fibers used for filter materials, PTFE fibers have significant advantages due to their excellent chemical stability, corrosion resistance, heat resistance, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/42D02J1/22D02G1/00D01F6/48
Inventor 宋朋泽
Owner 宋朋泽
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