Looking at the entire development process: paraffin and silicone were used in the early stage, but their performance could not meet people’s growing pursuit of high performance. Therefore, with the help of science and technology, eight-carbon fluorine-based waterproof processing agents were born. The birth of the eight-carbon fluorocarbon series surpasses paraffin and silicone types in terms of waterproof performance, and brings oil-proof properties that the former does not have. It is a revolution, and its performance in the entire system is perfect. However, with the discovery during use, the eight-carbon fluorine system will be accompanied by the production of PFOA and PFOS by-products during the production process, which are difficult to degrade, bioaccumulative, and carcinogenic, so the eight-carbon fluorine system will withdraw from the stage of history.
At present, people’s solution is to switch from eight carbons to six carbons that are easily degraded, but at the same time, fluorine-free products that do not use fluorine are also resurrected with the environmental protection trend, and they have become popular in the market for a while. Many terminal brands have put forward fluorine-free requirements for environmental protection.
In terms of environmental protection, there are two common types of fluorine-free: alkane long-chain water repellents, including common metal soaps, paraffins, hydroxymethyl, pyridines, etc. and silicones. Compared with fluorine-based products, fluorine-free products are not easy to be deposited in the body, are easily degraded, are harmless to the human body, and are safer and more environmentally friendly products. Today, as the concept of ecological and environmental protection becomes increasingly popular, fluorine-free products are more easily accepted by consumers, so the development of fluorine-free products has become a new research hotspot.
In terms of performance, fluorine-free can reduce the surface tension of fabrics below water, but not lower than oil. Therefore, fluorine-free can only give fabrics waterproof functions, but cannot give them oil-proof properties, which is far from the level of fluorine-based products. The effect is currently only applied to waterproof finishing of fabrics, and cannot achieve the three-proof finishing effect of “waterproof, oil-proof, and anti-fouling”.
So the development process has gone through a cycle, but the current fluorine-free technology level is higher than the previous paraffin silicone type. Fluorine-free is a trend under the high environmental protection requirements. It is not feasible for the current fluorine-free to completely replace fluorine-based products in terms of performance, and can only partially replace them. If fluorine-free products are to completely replace fluorine-based products, they must first solve the oil-proof problem and achieve a major breakthrough in performance.
As the darling of environmental protection, the fluorine-free craze will continue forever. However, after using high-performance eight-carbon, fluorine-free will always have more problems, causing a lot of troubles to production and processing, such as:
1. Due to the large amount of use, the color of the fabric changes greatly after using fluorine-free, especially the color deepening, especially the texture is more obvious, and the fabric with large light diffuse reflection deepens more obviously. Due to the characteristics of fluorine-free, modifiedThere is still a long way to go to change the color of the country itself.
[Countermeasures] A good solution is to take the color change into account when making samples and color matching to maintain color uniformity and production stability.
2. After the same amount of use, the dense film formation causes the friction between yarns to decrease, and seam slippage is easy to occur, which brings trouble to sewing.
[Countermeasures] The best way at present is to add some cross-linking agents and anti-splitting agents, sacrificing part of the feel and making some improvements.
3. After fluorine-free waterproof processing, directly entering the tank for repair will often cause spots to precipitate and stick back, resulting in defective products.
[Countermeasures] It is recommended to strip it before repairing to facilitate repairing.
4. For some high-density fabrics, white marks are easy to appear during fluorine-free waterproof processing, and the freshness of the fabric is greatly reduced.
[Countermeasures] It is recommended that the fabric should be as soft to the touch as possible during front-end processing, or use fluorine-free materials with good compounding properties and add some softener to improve it.
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