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Method for increasing wettability of polytetrafluoroethylene film employing electron beam radiation

A technology of polytetrafluoroethylene film wettability and polytetrafluoroethylene film is applied in the field of polymer material surface modification to achieve the effects of improving adhesion, short process and simple operation.

Inactive Publication Date: 2015-04-08
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electron beam radiation method has the advantages of simple operation and short time, but there is no research report on this aspect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for utilizing electron beams provided by the present invention to increase the wettability of polytetrafluoroethylene membranes may further comprise the steps:

[0019] 1) Cut the polytetrafluoroethylene film into a shape with a width of 2cm and a length of 5cm, and the thickness of the polytetrafluoroethylene film is 0.03~0.05mm thick;

[0020] 2) Wash the cut PTFE film with ethanol until the surface is clean and then dry;

[0021] 3) Put the polytetrafluoroethylene membrane treated in step 2) into the high-current pulsed electron beam vacuum sample chamber, start the high-current pulsed electron beam instrument, and vacuum the turbomolecular pump. The vacuum range is 2.5×10 -2 Pa~1.5×10 -2 Pa;

[0022] 4) Use high-current pulsed electron beam radiation to impact the surface of the material for surface modification treatment; the processing parameters are: acceleration voltage 6~10kV; current 40~50A; pulse interval 30~40 seconds; pulse number 5~10 times. ...

Embodiment 2

[0024] Cut the polytetrafluoroethylene film with a thickness of 0.03mm into a shape with a width of 2cm and a length of 5cm, clean it with ethanol until the surface is free of oil, and dry it; put the dried polytetrafluoroethylene film into a high-current pulse electron In the beam vacuum sample chamber, start the high-current pulsed electron beam instrument, and vacuum the turbomolecular pump to a vacuum degree of 2.5×10 -2 After Pa, electron beam radiation is used to impact the surface of the material for surface modification treatment; the treatment parameters are: acceleration voltage 6kV; current 40A; pulse interval 30 seconds; pulse number 4 times. The contact angle of PTFE film before and after modification was tested by contact angle measuring instrument. The test conditions are that the immersion depth is 5mm, the immersion speed is 0.5mm / s, and the test liquid is deionized water. After testing, the wetting angle of the polytetrafluoroethylene film without electron b...

Embodiment 3

[0026] Cut the polytetrafluoroethylene film with a thickness of 0.04mm into a shape with a width of 2cm and a length of 5cm, clean it with ethanol until the surface is free of oil, and dry it; put the dried polytetrafluoroethylene film into a high-current pulse electron In the beam vacuum sample chamber, start the high-current pulsed electron beam instrument, and vacuum the turbomolecular pump to a vacuum degree of 2.3×10 -2 After Pa, electron beam radiation was used to impact the surface of the material for surface modification treatment; the processing parameters were: accelerating voltage 7kV; current 50A; pulse interval 35 seconds; pulse number 3 times. The contact angle of PTFE film before and after modification was tested by contact angle measuring instrument. The test conditions are that the immersion depth is 5mm, the immersion speed is 0.5mm / s, and the test liquid is deionized water. After testing, the wetting angle of the polytetrafluoroethylene film without electro...

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Abstract

The invention discloses a method for increasing wettability of a polytetrafluoroethylene film employing electron beam radiation. The method comprises the following steps: 1) cutting the polytetrafluoroethylene film into a shape which is 2cm in width and 5cm in length, wherein the thickness of the polytetrafluoroethylene film is 0.01-0.08mm; 2) cleaning the cut polytetrafluoroethylene film with ethanol until the surface is clean, and then drying; 3) putting the polytetrafluoroethylene film processed in the step 2) into a high-current pulsed electron beam vacuum sample chamber, starting a high-current pulsed electron beam instrument, and vacuumizing by virtue of a turbo molecular pump, wherein the range of the vacuum degree is 3*10<-2>Pa to 1*10<-2>Pa; and 4) impacting the material surface by adopting radiation of the high-current pulsed electron beam, and carrying out surface modification treatment, wherein the processing parameters are as follows: the acceleration voltage is 4-12kV; the current is 20-80A; the pulse interval is 30-60s; and the pulse frequency is 2-20. According to the method disclosed by the invention, the lubricating property of polytetrafluoroethylene can be effectively improved; and the bonding capacity is improved.

Description

technical field [0001] The invention relates to the technical field of polymer material surface modification, in particular to a method for increasing the lubricating wettability of a polytetrafluoroethylene film by electron beam radiation. Background technique [0002] PTFE can be regarded as a chemical structure in which all hydrogen atoms in polyethylene are replaced by fluorine atoms. Since the atomic radius of fluorine is larger than that of hydrogen, the adjacent CF 2 The unit forms a helical twisted chain and cannot be completely oriented in the trans-cross direction. The fluorine atoms almost cover the surface of the entire polymer chain, so the polytetrafluoroethylene molecular structure has high regularity, good symmetry, high crystallinity, and excellent properties. Excellent high and low temperature resistance, chemical corrosion resistance, good lubrication performance, etc., can be widely used in aviation, aerospace, electronic machinery and many other fields....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/00C08J7/12C08L27/18
Inventor 高景龙苏镜宇刘艳辉智业倪早春
Owner SHENYANG LIGONG UNIV