Several common flame retardants for nylon flame retardant cloth

Classification:
Cotton nylon flame retardant fabric

Nylon can be flame retardant by halogen/antimony or other flame retardant synergistic systems, or it can be flame retardant by halogen-free flame retardant systems such as red phosphorus or melamine. From a quantitative perspective, the halogen/antimony synergistic system is still the most widely usednylon flame retardant fabric system. In some parts of Europe and Asia, efforts are underway to find alternatives to halogen flame retardants. But generally speaking, these alternative systems generally have problems such as low thermal stability or moisture absorption. For red phosphorus, there is also the issue of storage because it is flammable. Below are the main flame retardants used in nylon and their respective advantages and disadvantages.

(1) Halogen-containing flame retardant system: The most important one and one that is widely used abroad is brominated styrene polymer. It has extremely superior thermal stability, and because it is melt-miscible with nylon, it is widely used in It has good fluidity during processing. In addition, the flame-retardant nylon prepared with it also has excellent electrical properties and good physical and mechanical properties. The limitations of this flame retardant are poor photostability and not yet fully compatible with nylon. In addition, its cost is higher than that of decabromodiphenyl ether, which is currently widely used in China. Another flame retardant that has been used in nylon for many years is dikerin. It is a chlorine-containing flame retardant with high flame retardant efficiency and electrical properties, but it has limitations in thermal stability. Making it suitable only for nylon flame retardant systems with lower processing temperatures. The most widely used flame retardant in China is decabromodiphenyl ether. Due to its high bromine content, it has high flame retardant efficiency for nylon and is an economical flame retardant. However, because it is a filler type flame retardant, it has a great negative impact on the processing fluidity and the physical and mechanical properties of the product. In addition, its thermal stability and light stability are also poor. In recent years, a new flame retardant developed for use innylon flame retardant fabrics is decabromodiphenoxyethane, which is similar to decabromodiphenoxyethane. Diphenyl ether has the same bromine content and the same high flame retardant efficiency, and is free from the so-called dioxin problems as brominated styrenic polymers. In addition, it has good thermal stability and light stability. Its limitation is that it, like decabromodiphenyl ether, is a filler flame retardant and has poor compatibility with polymers, resulting in poor processing fluidity and poor physical and mechanical properties of the product. In addition, the cost increase is higher compared with decabromodiphenyl ether.

(2) Halogen-free flame retardant system: The most widely used halogen-free flame retardants in nylon are red phosphorus and melamine salts. Red phosphorus has high flame retardant efficiency and can improve the arc resistance of products, but its storage and color limitations greatly limit its application in nylon, and is generally only used in nylon 6. Another type of halogen-free flame retardant used in nylon is melamine salts, mainly melamine urate and phosphate. They have good flame retardant efficiency, but poor thermal stability, and because they easily absorb moisture, the products have poor electrical properties in humid environments.

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