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High Performance PTFE Film Challenges The Chinese Market
- May 17, 2018 -

At the Sixth China Water Expo, the sa-PTFE (hereinafter referred to as the "STEREO ACCUMULATED PTFE") high performance microporous membrane (hereinafter referred to as the PTFE membrane) is intended to enter the Chinese mainland market.

According to the decision of the State Council on accelerating the cultivation and development of strategic emerging industries, the new material industry is one of the key objects and development directions at this stage. Among them, high-performance membrane material is the key component. What is the performance of the PTFE film? Will its entry be a new vitality in China's water treatment market?

During the "Sixth China Water Expo", the reporter interviewed Zhou Kejing, the special adviser to walca, and Zhou Kejing, director of the China Comprehensive Research Institute of walca.

Corrosion resistance can exist in aqua regia

According to Luo Mingde, the PTFE membrane is a microporous membrane made of polyethylene Teflon, which is commonly known as plastic king, which is biaxially stretched and modified. In accordance with the physical and chemical properties of polytetrafluoroethylene, acid alkali resistance, chemical reagents, aging resistance and other excellent properties, it can be widely used in environmental treatment, such as waste gas and waste liquid, especially iron and steel waste liquid, electroplating waste liquid, semiconductor waste liquid, chemical waste liquid, printing and dyeing waste liquid, medical waste liquid. Such as difficult industrial waste liquid treatment, and chemical solvent recovery and other fields.

"The outer edge of PTFE carbon chain is all fluorine, and the corrosion resistance is fluorine ion." Zhou Ke analyzed the corrosion resistance of PTFE film from the performance and structure of PTFE membrane materials. "PTFE membrane can even exist in aqua regia." Editor's note: aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid. It is highly corrosive and can dissolve gold.

In addition, because the surface of the PTFE film is non cohesive, the adsorbent can be easily removed when backwashing is carried out. In addition, compared with other membranes, the strength of PTFE film is higher, and it can bear strong pressure when backwashing.

The above characteristics can effectively avoid the influence of backwashing on the service life of PTFE film. "After three or four years of experiments, the PTFE membrane is still functioning normally." Zhou Kejing said.