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This fabric can be oil-repellent without fluorocarbon finishing agent, which is another step in the green development of the textile industry

Time : 2020-11-02 Hits : 33

Oil-proof textile is a kind of ideal clothing fabric, which is not easy to be stained with oil, easy to clean, reduce the maintenance cost for consumers, so it is very popular in the consumer market.

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Fluorocarbon compounds (PFC), as finishing agents for low surface energy fabrics, can effectively improve the waterproof/oil-proof properties of fabrics. In particular, long-chain fluorocarbon polymers once became the main products in the market. However, fluorocarbons may affect human health and environmental safety during their use, and their by-products are not easy to be degraded in the environment. The European Union imposed a ban on the sale and use of PFOS and PFOA in 2008. Therefore, finding and developing new substitutes has become an important part of the textile chemical industry and textile dyeing and finishing industry all over the world.

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Columbia University recently announced a new type of oil-repellent textile that does not use PFC in its preparation. The researchers add texture to the surface of each fiber, and control the surface chemistry of the fiber material by controlling the size and spacing of the texture, so as to realize its oil-repellent function. The experimental results showed that the textiles were not wetting when the surface tension was as low as 23.9mn /m, and had a good alienation effect on rapeseed oil, olive oil and castor oil.

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The preparation principle is as follows: the surface of the fabric is hydrophilic after plasma etching. A large number of hydroxyl groups formed after the hydrolysis of TEOS can form a reaction layer on the fabric. After curing, a micro-nano structure with certain roughness can be constructed. Moreover, after immersing in the silanol solution, the large amount of silanol groups on the surface of the fabric can react with the siloxane of 1, 3-dichlorotetrachloromethyldisiloxane, thus reducing its surface energy. Under the synergistic effect of rough structure and low surface energy, the fabric has the property of oil repellency.

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In addition, due to the covalent bond between the surface material and the fiber, it can exist stably in the case of washing or wear, which ensures its durability to a certain extent. This study provides directions for promoting the sustainable development of functional textile products.

The thesis links: https://www.nature.com/articles/s41893-020-0591-9

(Source: Official Micro blog of Textile Herald)

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