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Microporous control modification method of expanded polytetrafluoroethylene membrane

A technology of polytetrafluoroethylene membrane and expanded body, which is applied in the field of micropore control modification of expanded polytetrafluoroethylene membrane, can solve the problems of high melting point, high melt viscosity and unusability of PTFE, and achieve remarkable heat and humidity resistance , short processing time and improved bonding strength

Inactive Publication Date: 2015-11-25
JIANGSU DONGBANG TECH
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Problems solved by technology

[0003] PTFE has a high melting point, high melt viscosity, and is very sensitive to shear in the amorphous state, and is prone to melt fracture. Therefore, conventional thermoplastic molding processes such as melt extrusion and injection molding cannot be used, and only similar powders can be used. Metallurgical methods for sintering

Method used

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Embodiment Construction

[0017] The present invention is further described below:

[0018] A microporous control modification method for expanded polytetrafluoroethylene membrane, comprising the following steps:

[0019] 4) Through the chemical reaction between the corrosive liquid and the expanded polytetrafluoroethylene film, part of the fluorine atoms on the surface of the material are torn off, leaving a carbonized layer and some polar groups on the surface;

[0020] 5) Introduce polar groups such as hydroxyl group, carbonyl group and unsaturated bond on the surface of expanded polytetrafluoroethylene film, so that the surface energy increases, the contact angle becomes smaller, the wettability improves, and it changes from difficult to sticky to sticky;

[0021] 6) Practical sodium-naphthalene solution method, sodium-naphthalene solution is formed by dissolving or complexing sodium and naphthalene in active ethers such as tetrahydrofuran and ethylene glycol dimethyl ether, and Na transfers the ou...

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PUM

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Abstract

The invention relates to a microporous control modification method of an expanded polytetrafluoroethylene membrane, which is characterized by comprising the following steps: a corrosion liquid and the expanded polytetrafluoroethylene membrane are subjected to a chemical reaction, part of fluorine atoms on the surface of a material is removed, and a carburization zone and certain polar group can be kept on the surface. The method has the advantages of obvious weatherability and humidity resistance by comparing with other methods, is adapted to long-term outdoor usage, the bonding surface area is increased, and bonding intensity is increased. The method has the characteristics of simple operation, short processing time, fast speed, no catalyst and initiator requirement, reaction under normal temperature and easy control of grafting rate; and is suitable for surface modification of polytetrafluoroethylene and other fluorine polymers.

Description

technical field [0001] The invention relates to the technical field of polytetrafluoroethylene, in particular to a micropore control modification method for expanded polytetrafluoroethylene membranes. Background technique [0002] Polytetrafluoroethylene (PTFE) is a special engineering plastic with excellent performance. It has a low friction coefficient, good chemical stability, and excellent dielectric properties. It is known as the "King of Plastics" and is a key technology in many fields. An indispensable material, widely used in petrochemical, electronics, electrical, aviation, aerospace, semiconductor, machinery, automobile and other fields, but pure PTFE has high wear rate, poor bearing capacity, difficult processing, stress cracking resistance, creep resistance The disadvantages such as poor denaturation limit its application range. Therefore, in order to expand the application field of PTFE, researchers at home and abroad have carried out a lot of modification rese...

Claims

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Application Information

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IPC IPC(8): C08J7/12
Inventor 宗昀蒋辉
Owner JIANGSU DONGBANG TECH
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