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Method for stably and continuously preparing polytetrafluoroethylene fibers

A technology of polytetrafluoroethylene and polytetrafluoroethylene powder is applied in the field of preparation of polytetrafluoroethylene fibers, which can solve the problems of inability to realize industrialized production, limit the mechanical properties of fibers, etc., achieve stable and continuous industrialized production, improve product quality and The effect of improving production efficiency and fiber performance

Inactive Publication Date: 2012-05-09
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder is required to have excellent fluidity, so only lower molecular weight resin raw materials can be used, which greatly limits the mechanical properties of the fiber
In addition, the use of plunger extruders cannot achieve stable and continuous industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing stable and continuous polytetrafluoroethylene fibers, the preparation process including screening of polytetrafluoroethylene micropowder, mixing of extrusion aids and powder, aging, high-pressure extrusion, heat treatment and cooling, super-stretching ,Specific steps are as follows:

[0031] ① Screening of PTFE powder

[0032] Under the condition that the temperature is 19°C, the polytetrafluoroethylene powder ( PTFE 640) for sieving to filter out large agglomerated particles.

[0033] ② Mixing of extrusion aids and powder

[0034] Take the sieved polytetrafluoroethylene powder (the part under the sieve), and add 15% Isopar-M. Place the mixture in an airtight container and mix to prevent volatilization of extrusion aids.

[0035] ③ ripening

[0036] The mixed mass was allowed to stand at room temperature for 28 hours.

[0037] ④High pressure extrusion

[0038] The above-mentioned cured mixture was fed into a high-pressure screw extruder, t...

Embodiment 2

[0045]A method for preparing stable and continuous polytetrafluoroethylene fibers, the preparation process including screening of polytetrafluoroethylene micropowder, mixing of extrusion aids and powder, aging, high-pressure extrusion, heat treatment and cooling, super-stretching ,Specific steps are as follows:

[0046] ① "Screening of PTFE powder

[0047] Under the condition of a temperature of 10°C, sieve polytetrafluoroethylene powder (Shanghai Sanaifu FR203A) with an 8-mesh filter to filter out large agglomerated particles.

[0048] ② Mixing of extrusion aids and powder

[0049] Take the polytetrafluoroethylene powder (the part under the sieve) after sieving, and add 25% kerosene. Place the mixture in an airtight container and mix to prevent volatilization of extrusion aids.

[0050] ③ ripening

[0051] The mixed mass was allowed to stand at room temperature for 16 hours.

[0052] ④High pressure extrusion

[0053] The above-mentioned cured mixture was fed into a high...

Embodiment 3

[0060] A method for preparing stable and continuous polytetrafluoroethylene fibers, the preparation process including screening of polytetrafluoroethylene micropowder, mixing of extrusion aids and powder, aging, high-pressure extrusion, heat treatment and cooling, super-stretching ,Specific steps are as follows:

[0061] ① "Screening of PTFE powder

[0062] At a temperature of 0°C, sieve polytetrafluoroethylene powder (Daikin FR104) with a 12-mesh filter to filter out large agglomerated particles.

[0063] ② Mixing of extrusion aids and powder

[0064] Take the sieved polytetrafluoroethylene powder (the part under the sieve), and add 20% naphtha. Place the mixture in an airtight container and mix to prevent volatilization of extrusion aids.

[0065] ③ ripening

[0066] The mixed mass was allowed to stand at room temperature for 24 hours.

[0067] ④High pressure extrusion

[0068] The above-mentioned cured mixture was fed into a high-pressure screw extruder, the die head ...

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Abstract

The invention discloses a method for stably and continuously preparing polytetrafluoroethylene fibers, which is capable of realizing stable and continuous industrial production by the aid of high-pressure screw for extruding filament. The method technically includes the steps of screening polytetrafluoroethylene powder, extruding auxiliaries to be mixed with the powder, performing high-pressure extrusion, performing heat treatment and cooling and performing high-temperature hyperploid drawing. The method has the advantages that by the aid of a high-pressure screw instead of a traditional plunger type extruder, a preform does not need to be pressed, and the method is simple in operation, easy in implementation and capable of realizing stable and continuous industrial production. Since the method is easy in continuous production, a completely sealed material transporting system can be used, the extruded auxiliaries can be recovered conveniently, and energy saving and environmental protection are realized. Under the high-pressure condition, flowability of the PTFE (polytetrafluoroethylene) is improved obviously, more resin raw materials with high molecular weight can be chosen, and accordingly, the performance of the acquired fibers can be improved greatly.

Description

technical field [0001] The invention belongs to the technical field of new chemical materials and relates to a method for preparing stable and continuous polytetrafluoroethylene fibers, in particular to a method for preparing stable and continuous polytetrafluoroethylene fibers using a high-pressure screw extruder. Background technique [0002] Polytetrafluoroethylene (PTFE) fiber, commonly known as Fluorolon or Teflon, has unique physical and chemical properties, such as high chemical inertness, low coefficient of friction (it is currently the smallest friction coefficient when in contact with metal alloys), excellent Excellent insulation and high and low temperature stability, excellent aging resistance and UV radiation resistance, and minimal water absorption, etc. As environmental protection issues have attracted more and more attention from the government and the people in recent years, PTFE, which has excellent high temperature resistance and chemical resistance, has a...

Claims

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Application Information

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IPC IPC(8): D01D1/00D01D1/06D01D5/12D01D10/06D01F6/12
CPCY02P70/62
Inventor 郭志洪邱高吴学丙王依民
Owner DONGHUA UNIV
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