What Is The Synergistic Effect Of Flame Retardants?

The general synergistic effect, more known as the flame retardant synergistic flame retardant system, that is, a flame retardant system composed of two or more components, as long as the proper choice, its flame retardant effect will be better than each component The sum of flame retardant effects.

In the flame retardant technology, more and more manufacturers choose synergistic flame retardant, because synergistic flame retardant is not simply to improve the flame retardant efficiency of the polymer, but also can reduce the content of certain components in the flame retardant system to meet the flame retardant requirements Under the premise of and can control costs well.

At present, common applications are the synergistic resistance system of halogenated compounds and antimony trioxide and halogenated or antimony with magnesium hydroxide and aluminum hydroxide. Replaced by iron, zinc oxide, zinc borate, etc., they are particularly effective in polyamides and epoxy resins containing chlorine-based flame retardants. Such synergists can not only capture free radicals in the gas phase, but also condense In the phase, a carbon layer is formed on the surface of the flame retardant material.

According to past experience, the relatively good synergist for aliphatic chlorine-based flame retardants is iron trioxide, which is even better than antimony trioxide in some plastics. Using zinc oxide as a synergist for some halogenated flame retardants can give the flame retardant substrate a high CTI (Leakage Track Index) value. When zinc stannate, zinc molybdate, zinc silicate and zinc borate compounds are used as a synergist of halogen flame retardants, the UL94 flame retardant level and CTI value of some plastics are improved, which are better than three Antimony oxide.

However, when antimony trioxide and zinc borate are used together, it can slow down the smoldering of the flame retardant material and improve the color of the flame retardant material.

As for halogenated flame retardants in flame retardant polystyrene, ABS and some other plastics, antimony oxide-inorganic silicate compound can be used as a synergist, which is not only low in cost but also low in tone strength. In addition, when the antimony compound and the magnesium compound-zinc compound compound are used as synergists, they can both improve the flame retardant effect and suppress smoke.