Nylon can be flame-retardant with halogen / antimony or other flame retardant synergistic systems, or with red phosphorus or melamine halogen-free flame retardant systems. In terms of quantity, the halogen / antimony synergistic system is still the most widely used Of nylon flame retardant systems.In some parts of Europe and Asia, people are working to find alternatives to halogen flame retardants, but generally speaking, these alternative systems generally have low thermal stability or moisture absorption and other issues.For the red phosphorus There are also storage problems, because they are flammable. Here are the main types of flame retardants used in nylon and their respective advantages and disadvantages.
(1) Halogen Free Flame Retardant System: The widely used non-halogen 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. However, Color limitations greatly limit its use in nylon and are generally used only in nylon 6. Another halogen-free flame retardant used in nylons is the melamine salt, mainly melamine urate and phosphate. They have good flame retardant efficiency, but poor thermal stability, and due to easy to absorb moisture makes products in poor electrical properties under humid conditions.
(2) Halogen-containing flame retardant system: One of the most important and most widely used abroad is brominated styrene polymer, which has extremely superior thermal stability, and because it is melt-mixable with nylon, So it has good fluidity in the process.In addition, the flame retardant nylon prepared by it also has superior electrical properties and better physical and mechanical properties.The limitation of such flame retardants is that the light stability is poor and And nylon is not yet fully compatible with the cost of the current domestic application of a relatively large amount of decabromodiphenyl ether is relatively high.Another application in the nylon flame retardants for many years is the enemy flammable, it is a containing Chlorine flame retardant, with high flame retardancy and electrical properties, but its thermal stability limitations make it suitable only for processing temperature lower nylon flame retardant system currently the most widely used in the domestic resistance Fluorocarbon is a decabromobiphenyl ether, which is the most economical flame retardant due to its high bromine content and its high flame retardant efficiency. However, since it is a filler type flame retardant, The processing of liquidity and physical and mechanical properties of products are very In addition, its thermal stability and light stability also poor education in recent years, people have developed in the flame retardant nylon used in a new flame retardant is decabromodiphenoxyethane, which with Decabromodiphenyl ether has the same bromine content and the same high flame retardance efficiency, and has the same DPO (ie, the so-called dioxins) problem as the brominated styrene polymer. In addition, it has good thermal stability Its stability is that it has the same filler flame retardants as DecaBDE and has poor compatibility with the polymer so that the processing fluidity and the physical and mechanical properties of the product are inferior. Biphenyl ether higher than the cost increase.