With the development of chemical synthesis technology and scientific research methods, the varieties of flame retardants are increasing day by day, peoples understanding of the nature of flame retardants is also getting more and more in-depth. The hydrogen halide gas and the smoke formed by the combustion of the halogen-based flame retardant will cause serious corrosion of the equipment and equipment on the scene of the accident, meanwhile, it will cause great difficulties in evacuation and fire extinguishing, resulting in suffocation of personnel. Therefore, efficient, non-halogenated, smoke suppression and reduce the generation of toxic gases, has become the current and future research and development of flame retardants in the forefront of research topics. The consumption of flame retardants mainly composed of magnesium hydroxide and aluminum hydroxide gradually increased, and the research on the development and application of metal oxides and other synergistic effects gradually progressed. Meanwhile, various synergistic flame retardants such as phosphorus-bromine, phosphorus-nitrogen System research is increasingly active. In addition, the research and development of flame retardants of silicon series, melamine and its derivative are also of concern. With the further study on the mechanism of thermal degradation of polymer materials and flame retardant system, new theories and techniques of flame retardancy have been recognized and discovered, such as high polymer chemical modified flame retardant, high barrier carbonized flame retardant , Cross-linked flame retardant and synergistic flame retardant, which greatly enriched the content of flame retardant science and technology and people choose the best flame retardant system. In the next period of time, brominated and phosphorus flame retardants will still dominate, while new flame retardant elements and systems are increasingly active. Thus, with the development of science and technology, flame retardant science and technology will be increasingly sophisticated.

  Non-halogenated
  Although halogenated flame retardants due to its low dosage, wide adaptability, has developed into a flame retardant market mainstream products. However, the vast majority of halogen-containing flame retardants release gases that are harmful to human beings and can cause corrosion and environmental pollution that can not be caused solely by fire. In recent years, the United States, the United Kingdom, Norway, Australia have designated or enacted laws and regulations, the combustion toxicity test for certain products or the release of acid gases for the use of certain products, therefore the development of halogen-free flame retardants to replace the halogen Flame retardants have become the world trend of flame retardant. Non-halogenated technology is the key to solve the ultrafine particle and surface treatment of solid particles, taking into account the formation and distribution of particles and purity issues.

  Smokers and non-toxic gases
  Smoke is the basic characteristics of polymer combustion, smoke density is too large not only reduce the visibility of the environment, but also to bring disaster relief a variety of unfavorable factors. Smoke suppression and non-toxic gasification has become the development of flame retardants. Halogen-free intumescent flame retardant because of the small impact on the environment and has the best flame retardancy has become a hot plastic flame retardant development.

  Surface treatment of inorganic flame retardants
  It has strong polarity and hydrophilicity. It has poor compatibility with non-polar polymer materials. It is difficult for the interface to form a good combination and adhesion so as to reduce the mechanical properties of the modified materials. In order to improve the compatibility of flame retardant and matrix material and reduce the influence of flame retardant on the mechanical properties of the material, it is an important way to maintain the original excellent performance of the material and the surface properties of the modified flame retardant. Commonly used methods are useful coupling agent or sodium stearate flame retardant surface treatment.

  Fine processing
  The main drawback of inorganic flame retardants is the addition of large, poor compatibility with synthetic materials, thus affecting the processing performance of modified materials and mechanical properties of products. It has been reported in the literature that the flame retardancy of inorganic flame retardants is inversely proportional to the particle size. The micronization of flame retardants, and even nanotechnology, can increase the contact area of flame retardants and materials to improve compatibility, but also reduce the amount of flame retardants, while playing the role of rigid particles to enhance the toughening effect.

  Synergy
  In a practical production application, a single flame retardant always has such or some defects, and using a single flame retardant is difficult to meet the higher and higher requirements. Several different flame retardant compound, mixed use, can seek the best economic and social benefits. Flame retardants compounding technology can synthesize the advantages of two or more flame retardants to complement each others performance, to reduce the amount of flame retardants, improve the flame retardant effect, but also make the physical and mechanical properties of the material subject to very small Impact. If a small amount of magnesium hydroxide in the expansion of flame-retardant polypropylene, the flame retardant properties of the system greatly increased. Synergistic flame retardant system, low cost, both flame retardant and smoke suppression, but also has some other special features, the prospects are very broad, is constantly developing new varieties.

  Improve the thermal stability of flame retardants
  Polymeric molding usually requires higher temperatures. Therefore, the synthesis of flame retardants with high thermal stability is an important aspect to improve the flame retardancy of polymers.

  Improve the compatibility with the base resin
  In the selection of additives, in addition to consider the necessary effect, but also must consider the compatibility of additives and base resin. The compatibility of the two is good, it will not affect the physical and mechanical properties of a substrate, and can improve the migration resistance, resistance to extraction. For poor compatibility with the substrate, it is difficult to increase the amount of additives, we must try to improve and improve its compatibility.

  As people pay more attention to the flammability of flammable materials, flame retardants have been developed greatly with the wide application of polymer materials. With the increasing awareness of environmental protection, new types of flame retardants are emerging. Some emerging technologies It is also continuously applied to the research and production of flame retardants. Foreign research on flame retardants has entered a relatively sound stage of development, environmentally friendly, complex type, intumescent flame retardants are favored; while in the country, flame retardants or a nascent industry, the study started late, Although great progress has been made, there is still a certain gap in output and variety structure compared with advanced countries. At present, the research and development in China focus on inorganic flame retardants, and some achievements have been made. In the future, the development trend of flame retardants will be non-toxic, halogen-free, low-smoke, minimal impact on the environment and has the best flame retardant properties of a new flame retardant system. It can be predicted that there will be a booming prospect for flame retardants in the world