Polytetrafluoroethylene hydrophilic modification plasma treatment device and method

Abstract

The invention discloses a polytetrafluoroethylene hydrophilic modification plasma treatment device. The structure of thepolytetrafluoroethylene hydrophilic modification plasma treatment device comprises a gas bomb, a gas valve, a flow controller, a bubble bottle, a gas circuit A, a mixing cavity, a gas circuit B, a flow equalizing cavity, a jet flow reactor, a metal objective table, a high-voltage power supply, a device box body, a reactor up-down adjusting knob and a bracket, wherein the gas bomb passes through the gas valve and then is connected with the mixing cavity; the mixing cavity is connected with the flow equalizing cavity; the flow equalizing cavity is connected with the jet flow reactor; the metal objective table is arranged below the jet flow reactor; the jet flow reactor is connected with the high-voltage power supply; the jet flow reactor is fixed on the bracket; the reactor up-down adjusting knob is connected with the bracket; when in work, hydrophilic modification of the to-be-treated polytetrafluoroethylene on the metal objective table is realized by forming high-intensity plasma jet. The polytetrafluoroethylene hydrophilic modification plasma treatment device disclosed by the invention has the following advantages: (1) the problems of environmental pollution, material performance damage and the like are solved; (2) the modification effect is good; (3) the flexibility and the extensibility are high.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene hydrophilic modified plasma treatment device and method, belonging to the field of plasma technology. Background technique [0002] Polytetrafluoroethylene (PTFE) material has many advantages such as acid and alkali resistance, organic solvent resistance and high temperature resistance, and is widely used in the production of films, rods, gaskets, etc.; however, the extremely strong non-polarity makes PTFE hydrophobic It is very strong, which greatly limits its application in the fields of medical treatment and hygiene. Hydrophilic modification of PTFE will greatly expand its application prospects; traditional methods of hydrophilic modification of PTFE The commonly used process is mainly realized by chemical corrosion. This method is relatively simple to realize. However, the corrosive chemical raw materials used in this process will cause performance effects such as obvious darkening of the surface o...

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Problems solved by technology

[0002] Polytetrafluoroethylene (PTFE) material has many advantages such as acid and alkali resistance, organic solvent resistance and high temperature resistance, and is widely used in the production of films, rods, gaskets, etc.; however, the extremely strong non-polarity makes PTFE hydrophobic It is very strong, which greatly limits its application in the fields of medical treatment and hygiene. Hydrophilic modification of PTFE will greatly expand its application prospects; traditional methods of hydrophilic modification of PTFE The commonly used process is mainly realized by chemical corrosion. This method is relatively simple to realize. However, the corrosive chemical raw materials used in this process will cause performance effects such as obvious darkening of the surface of the PTFE material and cause environmental pollution. In recent years, the use of The surface modification treatment of materials by low-temperature plasma has been used. The active particles in the low-temperature plasma can bombard the surface of the material, so that the chemical bonds of the molecules on the surface of the material are opened, and combined with the free radicals in the plasma, introducing Polar groups to enhance the hydrophilic properties of the material without the adverse effects of traditional chemical treatments

[0003] Patent CN 104971869 A proposes a method of applying high voltage between cathode and anode plates to generate oxygen plasma glow discharge to modify polytetrafluoroethylene high-temperature adhesive tape, which can realize environmental protection of polytetrafluoroethylene materials , non-polluting modification treatment, but the glow discharge described in this patent needs to be realized under low pressure conditions, the device cost is high, and the size of the material to be treated between the cathode and anode plates is limited by the size of the low pressure sealed chamber, In the method of using low-temperature plasma to modify the surface of materials, the atmospheric-pressure low-temperature plasma jet can be realized in a normal-pressure gas environment, so it has the advantages of simple device structure and flexible design, and this method can realize the plasma generation area Space separation from the material processing work area further expands the application of atmospheric pressure plasma in material processing; patent CN101430030A uses a single-tube low-temperature plasma jet to perform plasma jet hydrophilic modification on the outer surface of the PTFE hose, Improve the bondability of polytetrafluoroethylene hose; patent CN 105670024 A uses the single-tube plasma jet generated by the device to act on the surface of the tubular material to be treated, and at the same time realizes the hydrophilic modification of the inner and outer walls of the material tube However, there are still some shortcomings in the existing method of using atmospheric pressure low-temperature plasma jets to modify the hydrophilicity of PTFE: due to the strong combination of C and -F in the polymerized monomer of PTFE materials, the chemical stability is high , the existing modification treatment of polytetrafluoroethylene by atmospheric pressure plasma jet is limited by the size of the single-tube jet itself, the discharge intensity and the concentration of active particles produced are limited, and the treatment efficiency needs to be improved; in view of this deficiency, the present invention A high-intensity plasma jet treatment device suitable for hydrophilic modification of polytetrafluoroethylene was proposed to achieve efficient treatment of polytetrafluoroethylene and improve the effect of hydrophilic modification of polytetrafluoroethylene

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