Study on Flame Retardance of Polyethylene

Polyvinyl chloride itself has a chlorine atom because it has a chlorine atom, so it has its own flame retardant effect. However, when a large amount of plasticizer is added to polyvinyl chloride to make it a soft PVC, it is very flame-retardant. necessary. It should be emphasized here that, in addition to flame retardance, smoke suppression is also an urgent need to solve the problem of PVC.

(l) Use of flame-retardant plasticizers - phosphoric acid-based plasticizers (arylphosphonic acid, aryl alkylphosphonic acid), chlorinated paraffins, and chlorinated fatty acid-based plasticizers. When flame retardant plasticizers are used Consideration should be given to using plasticizers that both plasticize and do not reduce flame retardancy too much.

(2) Synergistic flame retardant. Due to the synergistic effect between the halogen and the lanthanum, the addition of antimony trioxide in the PVC can produce a better flame retardant effect on the PvC. If chlorinated paraffin is used at the same time, the effect is better. In soft PVC, replacing some of the antimony trioxide with zinc borate can serve as a synergist, improving flame retardancy and reducing smoke generation.

(3) Inorganic fillers. Inorganic fillers, especially magnesium hydroxide and aluminum hydroxide, have a good flame retardant effect on soft PVC, and the greater the amount added, the better the effect.

Halogen-based flame retardant systems are commonly used, mainly containing O-containing flame retardants, commonly used are 10-diphenyl ether, waved epoxy resin (BER), high temperature six olfactory cyclododecane (HBCDS) and so on. However, attention should be paid to the adverse effects on the substrate itself caused by the addition of flame retardants, such as process performance, impact strength, heat distortion temperature, thermal stability, etc., but also pay attention to the EU on plastic products "on the electronic and electrical equipment The directive on the prohibition of the use of certain hazardous substances, ie the ROHs Directive, prohibits the use of substances such as polybiphenyl diphenyl ethers and polyterpene diphenyl ethers, so if these products are sold to the European Union, they cannot use these types of flame retardants. Consider alternative products. It has also been reported that the combination of red phosphorus and phenolic resin also has a good flame retardant effect.