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Take you to understand the fluorine-free water repellent

Take you to understand the fluorine-free water repellent

  • Categories:技术专栏
  • Time of issue:2020-12-24 20:03:02
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Take you to understand the fluorine-free water repellent

Facing the increasingly refined consumer demand of consumers, more and more textiles are given functionality, and the water repellent function is one of the important branches. Fabric water repellent finishing is to reduce the additional pressure of the fiber capillary and reduce the surface tension of the fiber by treating the surface of the fabric, thereby preventing water from penetrating the surface of the fabric without affecting the air permeability of the fabric.

 

 

Water repellents on the market can be divided into fluorine-containing water repellents and fluorine-free water repellents. Because the electron cloud of fluorine atoms converges, the polarizability is small, and the atomic radius is small, the dispersion force with other substances is small. Moreover, the fluorocarbon bond energy is large and the heat resistance is good. These advantages lead to the outstanding performance of the fluorine-containing water repellent. As the content of fluorine atoms in the compound increases, fluorine-containing water repellents can not only repel water, but also repel oil and stains. Before the 21st century, they were widely used as a "three-proof" finishing agent. PFOA (perfluorooctyl sulfonic acid) and PFOS (perfluorooctyl carboxylic acid) in typical fluorine-containing water repellent agents can accumulate in organisms, which are harmful to the ecological environment and human health.
▲What is PFOA?
The Chinese name of PFOA is perfluorooctyl sulfonic acid. On the market, PFOA stands for perfluorooctanoic acid and its ammonium salt and is called "C8". On June 14, 2017, the European Union published (EU) 2017/1000 in its official gazette, adding the restriction clause of item 68 of Annex XVII of REACH on perfluorooctanoic acid (PFOA), officially including PFOA and its salts and related substances List of REACH regulations.
▲What is PFOS?
The Chinese name of PFOS is perfluorooctyl carboxylic acid. It is one of the most difficult-to-degrade organic pollutants in the world. It has high bioaccumulation and toxicity. The European Union has officially banned the use of PFOS in commodities.

With the continuous enhancement of people's awareness of environmental protection, the development of new fluorine-free finishing technology has become a research hotspot in today's water-repellent finishing. The transformation of fluorine-based water repellents to fluorine-free water repellents reflects the increase in people's awareness of environmental protection and self-protection.

 

 

 

A representative type of fluorine-free water-repellent agents is organosilicon compounds, which have better biocompatibility and lower raw material prices, and can form a layer of low surface tension water-repellent interface on the surface of the fiber. After finishing, the fabric has good water repellency and a certain style and feel, which has attracted wide attention from researchers.

Recently, Dow launched a new product, DOWSILTM IE-8749, a fluorine-free water repellent. The technology used was developed in cooperation with Dow and Nikka Chemical. It recently won the 2020 R&D 100 Award (this award is issued by the American science and technology magazine R&D, Every year, 100 excellent new technologies and new products are selected worldwide). The water repellent is based on a new organic silicon material. Compared with the traditional silicone water repellent, the water repellency of the fabric is improved, and its water repellency is still very excellent even after multiple washings. By incorporating DOWSILTM IE-8749 into the fabric finishing process, the hand feel of the fabric can be better controlled. Depending on the amount of addition, it can achieve a firmer hand feel with the addition of crosslinking agent from the very soft hand that is unique when using silicone alone. . The fluorine-free water-repellent finishing agent RUCO-DRY ECO launched by Rudolf is a kind of hyperbranched dendrimer polymer that does not contain organic halides and does not contain APEO, which is suitable for the water-repellent finishing of various fiber types.

The fluorine-free water repellent PHOBOL RSH launched by Huntsman is suitable for the water repellent finishing of cellulose fibers and their blended fabrics with synthetic fibers. It can be used in combination with fluorocarbon water repellents to reduce the use of fluorine water repellents. Environmental pressure.

The fluorine-free water repellent NT-X018 from Nano-Tex of the United States is a durable water repellent with a hydrocarbon molecular structure, suitable for the water repellent finishing of cotton, polyester, nylon and their blended fabrics.

In the future, environmentally friendly fluorine-free water repellents will become more and more popular. Further improving the water repellency and washing resistance of fluorine-free water-repellent agents, and the development of fluorine-free "three-proof" finishing agents with both oil and stain resistance will be the development trend of water-repellent finishing agents in the future. I believe this will be relevant in the future. The research will be more mature and perfect.

 

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