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Surface hydrophilic modification method for polytetrafluoroethylene bulked membrane

A polytetrafluoroethylene, hydrophilic technology, applied in the field of hydrophilic modification of membrane materials, can solve the problems of cumbersome modification process, complex modification process, short retention time, etc., and achieve the effect of simple treatment process

Inactive Publication Date: 2010-11-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modification methods have their own characteristics. In general, chemical treatment methods often have a great impact on the chemical structure of the membrane surface, and due to the chemical inertness of PTFE, the modification process is more complicated and the modification process is cumbersome. , and is likely to cause environmental pollution; simple plasma treatment, its hydrophilization effect is uncertain, and the retention time is short; surface coating is affected by external physical and mechanical factors, the coating layer is easily damaged and cannot guarantee lasting hydrophilization water effect

Method used

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  • Surface hydrophilic modification method for polytetrafluoroethylene bulked membrane
  • Surface hydrophilic modification method for polytetrafluoroethylene bulked membrane
  • Surface hydrophilic modification method for polytetrafluoroethylene bulked membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Low-voltage glow discharge plasma treatment:

[0018] First, soak the expanded polytetrafluoroethylene membrane in acetone for 5 minutes, then wash it with distilled water for 10 minutes, let it dry naturally, then put the expanded polytetrafluoroethylene membrane into the vacuum chamber 1, and turn on the vacuum pump 2 to pump Vacuum to 5Pa, stabilized for 1 minute, open the pressure reducing valve of the helium cylinder 3, and introduce the reaction gas of He gas to make the pressure reach 15Pa, and after stabilizing for 1 minute, start to use low-temperature plasma to carry out surface treatment on PTFE, the treatment conditions for:

[0019] The plasma reaction gas is He gas, the pressure is 15Pa, the processing power is 100W, and the processing time is 60s;

[0020] (2) Acrylic acid graft modification treatment:

[0021] First, make a solution of acrylic acid, put it in a constant temperature water bath to keep the temperature at 60°C, and then expose the exp...

Embodiment 2

[0023] (1) Low-voltage glow discharge plasma treatment:

[0024] First, soak the expanded polytetrafluoroethylene film to be treated in acetone for 10 minutes, then wash it with distilled water for 20 minutes, let it dry naturally, then put the expanded polytetrafluoroethylene film into the vacuum chamber 1, and turn on the vacuum pump 2 to pump Vacuum to 3Pa, after 2 minutes of stabilization, open the pressure reducing valve of the helium cylinder 3, and let in the reaction gas of He gas to make the pressure reach 30Pa, and after 2 minutes of stabilization, start to use low-temperature plasma to carry out surface treatment on PTFE, the treatment conditions for:

[0025] The plasma reaction gas is He gas, the pressure is 30Pa, the processing power is 50W, and the processing time is 90s;

[0026] (2) Acrylic acid graft modification treatment:

[0027] First, make a solution of acrylic acid, put it in a constant temperature water bath to keep the temperature at 50°C, and then ...

Embodiment 3

[0029] (1) Low-voltage glow discharge plasma treatment:

[0030] First, soak the expanded polytetrafluoroethylene membrane in acetone for 7 minutes, then wash it with distilled water for 15 minutes, let it dry naturally, then put the expanded polytetrafluoroethylene membrane into the vacuum chamber 1, and turn on the vacuum pump 2 to pump Vacuum to 4Pa, stabilize for 3 minutes, open the pressure reducing valve of the helium cylinder 3, and let the reaction gas of He gas to make the pressure reach 50Pa. for:

[0031] The plasma reaction gas is He gas, the pressure is 50Pa, the processing power is 150W, and the processing time is 30s;

[0032] (2) Acrylic acid graft modification treatment:

[0033] First, make a good solution of acrylic acid, put it in a constant temperature water bath to keep the temperature at 70°C, and then expose the expanded polytetrafluoroethylene film treated in step (1) to the air for 20 minutes, then immerse it in the prepared acrylic acid In the sol...

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Abstract

The invention relates to a surface hydrophilic modification method for a polytetrafluoroethylene bulked membrane, which is characterized by comprising the steps of: pretreating a polytetrafluoroethylene membrane by adopting low-pressure glow discharge plasma to make the surface of the polytetrafluoroethylene membrane generate active groups, and grafting acrylic acid to form a relatively stable hydrophilic layer. The method has the advantages that: the active groups are generated on the surface of the polytetrafluoroethylene membrane by low-pressure plasma treatment, and the relatively stable hydrophilic layer can be formed on the surface of the membrane by acrylic acid grafting treatment, so that the hydrophilicity of the polytetrafluoroethylene membrane is effectively improved, and the effect is lasting; and the polytetrafluoroethylene membrane is treated by the low-pressure plasma induction and acrylic acid grafting, so the treatment method is simple, high-efficiency, water and energy-saving, and suitable for industrialized production.

Description

technical field [0001] The invention relates to a method for modifying the surface hydrophilicity of polytetrafluoroethylene expanded membranes, and belongs to the technical field of hydrophilicity modification of membrane materials. Background technique [0002] Glass fiber / PTFE film-coated filter material is a high-efficiency high-temperature-resistant filter material made of glass fiber surface compounded with expanded microporous PTFE. Its production process adopts the internationally advanced high-temperature hot-press composite technology Compared with the traditional glue-coated filter material, the prepared film-coated filter material has the advantages of high applicable temperature, water-repellent and breathable, and high dust removal efficiency, and has been highly evaluated in practical applications. However, high-temperature hot-pressing composite technology puts forward high requirements on equipment and materials. Since PTFE membrane has the characteristics o...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D71/82B01D67/00
Inventor 俞建勇陈亏高晶还伟海马一梓
Owner DONGHUA UNIV
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