Discussion on the dosage and solid content of waterproof and oil repellent agent
When the fabric is finished with a water-repellent and oil-repellent finishing agent, you will often hear technicians or salespeople talking about the dosage and solid content. Below, Chemical Industry will answer the questions about dosage and solid content, so that you can We must control costs and get rid of the misunderstanding that the higher the solid content, the better the product.
As we all know, the reason why fluorine-based water- and oil-repellent agents have excellent water- and oil-repellent properties is determined by the structure of fluorine carbon atoms. The atomic radius and polarizability of fluorine are small, the electronegativity is the highest among all elements, and the polarizability of the carbon-fluorine bond is also small. Since the fluorine-based fabric water repellent contains a large number of carbon-fluorine bonds and has low intermolecular cohesion, when it is baked at high temperature to form a film on the surface of the fabric, or reacts with active groups on the fiber, the free energy on the surface of the fiber will be reduced. It is therefore difficult to be wetted or adhered to by various liquids.
The higher the dosage of water-blocking and oil-repellent agent given to the fabric, the better the water- and oil-proof effect. However, after reaching the saturated dosage, the water-blocking and oil-proof effect will no longer improve, resulting in a waste of costs. The fabrics sold in the market Water and oil repellent agents vary greatly in structural composition and various physical and chemical properties, and their dosage needs to be adjusted according to user requirements. For example, the recommended dosage of water-blocking and oil-proofing agents for cotton is 30 to 60 g/L, and water blocking agents for chemical fiber fabrics are mostly 10 to 50 g/L, and some recommend 30 to 80 g/L or 10 to 60 g/L.
Water -resistant oil -resistant The solid content is one of the main basic indicators of liquid fabric auxiliary agent, which can be expressed to a positive degree of the effective content of the aid. The solid content of water-blocking and oil-repellent agents is generally 10% to 40%, but it does not mean that the higher the solid content, the better the water- and oil-repellent properties. In fact, the fluorine-containing monomer content in the water-repellent emulsion of fluorine-based fabrics is high, and its water-repellent and oil-repellent properties are high. This is due to the fact that after finishing fabrics with fluororesin, the fluororesin accumulates into a more or less continuous film covering the fibers. Similar to other emulsions, its attachment to the fibers is achieved through mechanical or physical effects. Therefore, in order to more accurately evaluate the water-blocking and oil-blocking performance of the water-blocking and oil-proof finishing agent, the water-blocking and oil-proof effect should be confirmed by actual proofing.
This article is compiled and edited by Chemical Industry. Please indicate the source when reprinting. Chemical Industry mainly produces and distributes: water-blocking and oil-proof agents, DuPont three-proof, nano-three-proof additives, super water-repellent agents, anti-mildew and bacteriostatic agents, anti-UV agents, moisture-absorbing and quick-drying agents. Finishing agent, anti-mosquito finishing agent, soft and smooth agent, cooling skin care finishing agent, hot skin care finishing agent, aloe vera moisturizing agent, silk protein, collagen skin care finishing agent. National unified service hotline: 400-0909-770 (toll free)
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