Bonding method for processing tetrafluoroethylene products

In the processing of PTFE products, it is often necessary to combine different parts of the same material or combine PTFE with other metal or non-metal materials. Adhesive is one of the most convenient and practical options. However, since the surface tension of PTFE itself is lower than that of all other solid materials, it is impossible to directly bond. Surface treatment of PTFE products is the key to good bonding effect.

1. Physical coarsening process

The actual physical roughening process is plasma treatment. Plasma is also called glow discharge. What is used for the surface treatment of materials is a kind of energy called cold plasma. High-frequency discharge at atmospheric pressure of 0.13-0.18Mpa produces high-energy ions to sputter the surface of PTFE and generate many fine bumps. Compared with chemical treatment, the surface of this treatment can obtain higher bonding strength because it does not receive air and ultraviolet rays. The role of.

2. Chemical treatment process

It mainly includes the preparation of chemical treatment liquid and the surface treatment of PTFE. The available chemical treatment liquids are sodium naphthalene treatment liquid and liquid sodium ammonia solution. The former is mainly used in China.

3. Bonding

The PTFE products that have undergone the above surface treatment and the materials that require bonding with them can be bonded with a general adhesive.