Silicone powder (halogen-free cable lubricant) is used for flame retardant synergy in flame retardant systems. Many different additives (lubricants, antioxidants, flame retardants, etc.) are often added to the processing of polymer materials. , fillers, thus forming a multiphase system, the balance between the phases is particularly important, will directly affect the physical properties of the material. Silicone powder can connect the upper and lower parts of the system, while pulling the additives to fuse the polymer together, so that the phases reach a state of equilibrium, fully ensuring that the various additives and fillers are fully mixed with the resin during the plasticization process.
Take the application of silicone powder (halogen-free cable lubricant) in halogen-free cable systems as an example. Metal hydrate flame retardant systems (magnesium hydroxide and aluminum hydroxide) are widely used. In order to obtain better flame retardant effects, a larger addition ratio is often required. However, the higher the addition ratio, the greater the impact on the mechanical properties of the material itself, and the lack of toughness and brittleness is counterproductive. Therefore, it has become a difficult problem to use less flame retardant to obtain a higher flame retardant effect without affecting the mechanical properties of the material itself. One of the solutions is to use silicone powder as a synergist for flame retardants.
Silicone powder ( halogen-free cable material lubricant) is widely used as a flame retardant synergist by many wire and cable manufacturers and wire and cable material modification manufacturers, as well as the manufacture and modification manufacturers of automotive plastics and household appliance housings. First, silicone powder (halogen-free cable material lubricant) is inert and does not react with strong alkali. Secondly, the coupling effect of silicone powder (halogen-free cable material lubricant) can promote the uniform dispersion of magnesium-aluminum flame retardant system and the bonding of resin. In addition, the viscosity of silicone flame retardant is less than that of polymer material during high-temperature combustion, resulting in phase separation. When the silicone flame retardant system is heated and burned by polymer material, a silicone-enriched layer will be formed on the surface, and silicone will be produced during combustion. The inorganic oxygen-isolating protective layer and flame-retardant carbonized layer of -Si-O- and -Si-C-keys not only prevent the decomposition products produced by combustion and decomposition from overflowing, but also inhibit the decomposition of polymer materials, thereby achieving the purpose of high flame retardancy, low smoke and low harm. Since the flame retardant effect of silicone is related to the richness of its surface, the size of the molecular weight is closely related to the size of siloxane. At the same time, silicone powder (halogen-free cable material lubricant) can become a nucleating agent in the crystalline resin, which can improve the crystallinity of the material surface and enhance the surface hardness. Compared with the conventional carbon layer structure, the protective layer after burning is more compact and stable, thereby further improving the flame retardant effect.
