It was born due to the needs of life and work, and it has brought people a lot of convenience and protection. In pursuit of perfect performance, it has undergone a transformation from fluorine-free to fluorine-based C8 with superior performance. After decades of development, C8 The performance is becoming more and more perfect day by day. But just when the performance is perfect, it has to change to the fluorine-based short carbon chain C6 with slightly worse performance. Why is this?
Research has found that the production of C8 through electrolysis will be accompanied by a by-product called perfluorooctane sulfonic acid (PFOS), and the production of C8 through telomerization will be accompanied by a by-product called perfluorooctanoic acid (PFOA):
The chemical formula of PFOS isC8F17SO2X, structure is:
Through research, people have found that PFOS has:
Persistence—It will not decompose even if boiled in sulfuric acid; there will be no degradation when the pH is from 1.5 to 11.0 in water at 50°C; the half-life of PFOS has been determined to be more than 41 years .
Bioaccumulative—The accumulation level is higher than organochlorine pesticides and dioxins; fish bioconcentration coefficient: 2796 –3100; half-elimination time: the human body takes 8.7 years.
Toxicity—Genotoxicity, male reproductiveReproductive toxicity, neurotoxicity, etc.; animal experiments show that PFOS content of 2 mg per kilogram of animal body weight can cause death.
Ability of long-distance environmental migration—In the Arctic region, wild animals are contaminated by PFOS; the PFOS in the Huangpu River is 26.46 mg/L.
The chemical formula of PFOA is C8F15 O2H, has the structure:
PFOA is also a substance similar to PFOS. Compared with PFOS, PFOA has a shorter half-life and is less toxic, but it can also remain in the human body for as short as four years and as long as half a lifetime. Carcinogenic studies have found that it can induce Tumors in different parts of the testicle, pancreas, mammary gland, etc., and lead to weight loss in experimental animals.
It can be seen from the above that although the waterproof performance of C8 is perfect, it will cause great harm to people and pollute the environment. The new C6 will not produce PFOS and PFOA during production, and its performance is close to C8 after several years of careful research and development, so from an environmental protection perspective , the transformation from C8 to C6 is people’s emphasis on the environment and a manifestation of self-protection.
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