The advantages and disadvantages of common flame retardants are analyzed and the external development status is as follows:
1. Current situation of flame retardant development at home and abroad
The flame retardant is a high-molecular synthetic material booster, and the flame retardant can be used for flame-retardant treatment on the high-molecular material so as to avoid the burning of the material and prevent the fire from spreading, and the synthetic material has the functions of smoke-eliminating, self-extinguishing and flame-retardant property.
Analysis of advantages and disadvantages of commonly used flame retardants.
In recent years, with the increase of the production of the plastic products and the improvement of the safety standard, the application of the flame-retardant material is more extensive, in general, the flame-retardant material can be divided into an organic flame-retardant material and an inorganic flame-retardant material. In which, the organic flame-retardant material is mainly a halogen additive, and the inorganic material not only has a certain flame-retardant effect, but also generates hydrogen chloride and prevents the smoking. In addition, that inorganic flame-retardant material is non-toxic, non-corrosive and low in price. The consumption of the inorganic flame-retardant materials in the United States and Japan is more than 60%. However, the consumption of the inorganic flame-retardant materials in China is less than 10%.
Due to the large particle size of the micron magnesium hydroxide powder and the poor affinity of the PVC system, the dispersion difference is caused, and the mechanical property of the system is greatly reduced. And the surface of the modified micron-level powder can be coated with an organic substance, so that the compatibility of the system can be enhanced and the PVC system is improved, so that the mechanical and mechanical property of the system is improved to a certain extent. At the same time, because the size of the unmodified nano magnesium hydroxide is small, the surface energy is high, the agglomeration is easy to be agglomerated, the distribution of the magnesium hydroxide powder in the PVC system is not uniform, and the oxygen index of the modified and modified micron-grade magnesium hydroxide flame retardant in the PVC system also And the modified nano magnesium hydroxide powder can be reduced by the surface, so that the defect of easy agglomeration is overcome, and the magnesium hydroxide is better dispersed in the PVC system, so that the oxygen index is increased, and the influence of the mechanical property of the mechanical property is greatly reduced, and the superiority of the nano powder is reflected.
Classification of Common Flame retardants for magnesium hydroxide Flame retardants
1. Bromine flame retardants
Bromine flame retardant refers to the flame retardant containing bromine element (Br) in the molecular structure of flame retardant. It is the largest organic flame retardant in the world and the most efficient flame retardant at present.
II. Chloride flame retardant.
Chlorine series flame retardants are also halogen-like flame retardants, and chlorine chemical elements conform to (Cl). Chlorinated flame retardants are less efficient than brominated ones.
III. Phosphorus flame retardants
Organophosphorous flame retardant is an important halogen-free flame retardant, the chemical element is in the form of P, and the most widely used phosphate is phosphate.
4. Nitrogen (N) and P-N (P-N) flame retardant
Phosphorus and phosphorus nitrogen flame retardants are very important halogen-free flame retardants. It is usually a component of an expansive flame retardant.
5. Inorganic flame retardant
The common inorganic flame retardant has inorganic Honglin (P), antimony (mainly antimony trioxide), magnesium hydroxide, aluminum hydroxide, and the like. The main mechanism is to release water vapor or an inert gas by thermal decomposition or to generate a liquid or solid residue with a barrier effect.