Since the birth of flame retardant chlorinated rubber, the use of chemical methods of flame retardant polymers has been hundreds of years of history. In recent years, with the improvement of people's safety awareness and environmental protection awareness, flame retardant requirements have been paid more and more attention, flame retardant technology has also been developed rapidly, and new flame retardant technologies have emerged. The following small series to briefly introduce a few new flame retardant technology.

1. Microencapsulation Technology

The application of microencapsulation in flame retardants is a new technology developed in recent years. The essence of microencapsulation is that after the flame retardant is crushed into particles, the organic or inorganic matter is wrapped to form a microcapsule flame retardant, or the inorganic matter with a large surface is used as a carrier to adsorb the flame retardant in the gap of these inorganic carriers to form a honeycomb microcapsule flame retardant. Microcapsule technology has many advantages such as preventing the migration of flame retardants, improving flame retardant efficiency, improving thermal stability, and is also very beneficial to the compounding and synergy between components and the manufacture of multifunctional flame retardant materials.

2. Ultrafine technology

Inorganic flame retardants have the advantages of high stability, non-volatilization, low smoke toxicity and low cost, but due to their poor compatibility with polymers and large addition amount, the mechanical properties and heat resistance of materials are reduced. At present, the ultrafine and nanocrystallization of aluminum hydroxide (ATH) is the main research and development direction. The addition of a large amount of ATH will reduce the mechanical properties of the material, and the filling will have the effect of plasticization and reinforcement of rigid particles, especially nano-scale materials. Because the flame retardant effect is controlled by the chemical reaction, and the same amount of flame retardant, the smaller the particle size, the larger the surface area, the better the flame retardant effect. In addition, the ultrafine nano-ATH can be more uniformly dispersed in the matrix resin due to the enhanced interface interaction, which can more effectively improve the mechanical properties of the blend. The flame retardant polymer using ultra-fine technology combines the advantages of organic polymer such as good flexibility, low density and easy processing with the strength, hardness, heat resistance and not easy to deform of inorganic fillers, showing strong vitality.

3. Macromolecular Technology

At present, the development of flame retardant technology presents many new trends, and macromolecular technology is one of the new technologies that have just emerged in flame retardant research. In recent years, its research is very active and has achieved a series of results. For example, the new feature of the development of brominated flame retardants is to increase the bromine content and increase the molecular weight. As we all know, the main disadvantage of brominated flame retardants is to reduce the anti-ultraviolet stability of the flame retardant substrate, and generate more smoke during combustion., Corrosive gas and toxic gas, so its use is limited. Macromolecular brominated flame retardants are much better than many small molecular flame retardants in terms of mobility, compatibility, thermal stability, and flame retardancy, and may become the replacement products in the future. For another example, the phosphoric acid ester series compounds have high volatility and low heat resistance, and their flame retardant properties and the mechanical properties of the resin materials need to be improved. Macromolecular flame retardants such as multi-aryl silicon-containing diphosphate not only have excellent flame retardancy, but also have high thermal stability, low volatility, good compatibility with the resin, no effect on processing performance, durability, light resistance, water resistance and other advantages. Polymeric organophosphorus flame retardants have also become the focus of development, and a series of new large molecular weight or polymeric organophosphorus flame retardants with good compatibility and high stability have appeared.

4. Smoke elimination technology

In a fire, the suffocating smoke produced by the combustion of polymers is a very serious air pollution, and it also brings great difficulties to extinguish the fire. Therefore, contemporary flame retardant is comparable to smoke suppression, and for some plastics, smoke suppression is more important than flame retardant. Halogen-containing polymers, halogen flame retardants and antimony compounds are the main sources of smoke. Therefore, the non-halogenation of flame retardants is the main way to reduce the amount of smoke, in addition to adding smoke suppressants is another solution.