Brominated flame retardants and silicone flame retardants

It is understood that polyurethane rigid foam (RPUF) is an important decomposition resin, the thermal conductivity is lower than the rest of the decomposition of thermal insulation materials and thermal insulation materials, thermal performance is the best, is generally used to build thermal insulation category. However, RPUF because it contains flammable hydrocarbon segments, low density, large specific surface area, easily extinguished, as usual, the need to increase 20weto-30W. Shrink graphite and other additives to reach the building materials on the request of the flame retardant function. "However, at this increase, the performance of the polymer deteriorates fiercely. It is necessary to graft or perhaps participate in other examples of organic nano-flame retardants to strengthen the flame-retardant effect of shrinkage graphite and reduce its dosage," relevant sources said.

Brominated flame retardants

  "Currently on the market adiabatic flame retardant polyurethane foam grade are not up to Bl level, as usual can only reach B2 level. Usually shrink graphite (EG) do shrink flame retardant, while taking part in some brominated flame retardants Flame retardant level. "Wang Feng said. Beijing functional polymer construction materials engineering and technology research center researchers, the shrinkable graphite and aluminum hydroxide as a flame retardant added to the RPUF prepared compound modified RPUF, a significant synergistic effect of flame-retardant, the oxygen index Reached 31%.

  Silicone flame retardants: high efficiency, high efficiency, Nanjing Polytechnic University, the information provided by the performance of the main silicone flame retardant mainly polysiloxane and its derivatives, is a new type of high efficiency, low toxicity, anti-droplet, Friendly halogen-free flame retardants, but also a carbon-based smoke suppressant. Silicone flame retardants in addition to the base to provide excellent flame retardant function, but also to improve the processing of substrates, heat-resistant functions.

 Relevant persons said that the role of brominated flame retardants is to suppress the consequences of good, can improve the substrate into carbon, while improving the substrate processing and mechanical properties. However, the low cost of silicone flame retardants, so more efficient, high-performance silicone flame retardant will be the trend of future growth.

At present, Shanghai Jiaotong University polymer materials through the participation of non-halogen silicone rubber and phosphorus flame retardant, prepared a non-halogen flame retardant glass fiber / nylon 66 composite materials. The experimental results show that the silicone rubber compound material mechanics, flame retardant performance has an impact, when the amount of silicone rubber is 6%, the composite material has the best overall performance, the gap blow strength than the non-silicone rubber improved by 8% , Flame retardant test up to VO level. When the amount of adhesive is 6%, the composite material has the best overall performance. The notch impact strength is improved by 8% compared with that of the non-silicone rubber, and the flame retardancy test reaches V-O level.