Inorganic flame retardants
  Inorganic flame retardants are mainly aluminum hydroxide and magnesium hydroxide. At present, inorganic flame retardants are widely used abroad, of which the consumption of inorganic flame retardants in the United States, Japan and Western Europe accounts for 60% and 64% respectively of the total consumption of flame retardants. %, 50%.
  Aluminum hydroxide and magnesium hydroxide are white powder, the relative density of about 2.4, particle size 1 ~ 20μm. Aluminum hydroxide began to dehydrate at 200 ° C and magnesium hydroxide began to dehydrate at 340 ° C. Magnesium hydroxide high thermal decomposition temperature, higher than the aluminum hydroxide 140 ℃, magnesium hydroxide can be added to the composite material can withstand higher processing temperatures, which will help speed up the extrusion speed, shorten the molding time, but also help Improve flame retardant efficiency. Magnesium hydroxide small particle size, small wear and tear on the device, which will help prolong the service life of processing equipment. Since magnesium hydroxide has many advantages over aluminum hydroxide, the proportion of magnesium hydroxide is increasing. Compared with similar inorganic flame retardants, magnesium hydroxide has a better smoke suppressing effect. Magnesium hydroxide in the production, use and disposal of non-hazardous substances in emissions, but also to neutralize the combustion process of acid and corrosive gases.
  Aluminum hydroxide and magnesium hydroxide as a flame retardant when used alone, the amount of 40% to 60% in general, which seriously affected the mechanical properties of the material. Uniform dispersion has become the most important issue in the processing engineering. Select the excellent performance of the surface modifier, the surface modification of magnesium hydroxide, magnesium hydroxide is the first priority before use. The purpose is to improve the surface activity of the particles, improve the dispersion, improve the flame retardant effect, improve the compatibility with the polymer materials and improve the impact resistance and thermal properties.
  Red phosphorus masterbatch flame retardants
  In non-halogen flame retardants, red phosphorus is a better flame retardant, with less added, versatile and so on. Ordinary red phosphorus easy to absorb moisture, poor compatibility with the polymer materials, especially prone to spontaneous combustion, can not be used. Microencapsulated red phosphorus flame retardant, reducing the activity of red phosphorus to solve the compatibility of red phosphorus content of about 85%, but the spontaneous combustion problems have not been effectively resolved, serious dust pollution.
  Red phosphorus masterbatch is red phosphorus and aluminum hydroxide, expanded graphite and other inorganic flame retardants used in combination with the matrix resin as the carrier of dark red particles, safety issues have been resolved. Its low smoke, high flame retardant efficiency; no dust pollution, excellent processing performance; low density, good thermal stability, reduced physical properties of the product; process does not frost, does not migrate, do not corrode the mold. In particular, products with high resistance to tracking marks (CTI), the obvious advantages in the electrical and electronic applications. .
  The main disadvantage of red phosphorus masterbatch is the hue problem, in addition to dark red and black, can not give the product more color choices.
  Red phosphorus masterbatch for general plastics, rubber, polyethylene, polypropylene and other oxygen-deficient materials, flame retardant, preferably with magnesium hydroxide, aluminum hydroxide used in combination; for PET, PC, PBT, PA, etc. Flame retardant oxygen-rich materials, can be used alone; in the process, in order to achieve the best red phosphorus dispersion, you can mix a certain amount of dispersant.