Flame retardant as a regular means of fire prevention, is widely used in a variety of materials. The flame retardant effect of flame retardant can be divided into two categories, one can delay the fire event, and inhibit the spread of fire, through a variety of principles of action to suppress the combustion reaction, the other is to make the surface of the material rapidly foaming expansion and carbonization, forming a protective layer. Recently, Xiaobian heard a new term, called the synergistic effect of flame retardants, specially consulted the technical personnel, today Xiaobian will tell you about itflame retardantWhat is the synergistic effect.

The synergistic system of flame retardants, that is, a flame retardant system composed of two or more components, as long as it is properly selected, its flame retardant effect will be better than the sum of the flame retardant effects of each component.

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 some components in the flame retardant system, meet the flame retardant requirements of the premise and can be very good cost control.

At present, the most mature application is the synergistic flame retardant system of halogen compounds and antimony trioxide. However, in some flame retardant materials, antimony trioxide can also be replaced by iron oxide, zinc oxide, zinc borate, etc., which are especially effective in polyamide and epoxy resin containing chlorine flame retardants. Such synergistic agents can not only capture free radicals in the gas phase, but also play a role in the condensed phase, A carbon layer is formed on the surface of the flame retardant material. According to past experience, the most effective synergistic agent for aliphatic chlorine flame retardants is ferric oxide, which is even better than antimony trioxide in some plastics. Zinc oxide as a synergetic agent for some halogen-based flame retardants can give flame-retardant substrates a highCTI(Tracing Index) value. When zinc stannate, zinc molybdate and zinc silicate and zinc borate complexes are used as synergists for halogen-based flame retardants, it improves the performance of certain plastics.UL94Flame retardant grade andCTIValue of two aspects, are better than three antimony oxide.

When antimony trioxide and zinc borate are used together, the smoldering of flame retardant materials can be slowed down and the color of flame retardant materials can be improved.

Flame retardant polystyrene,ABSand other halogen flame retardants in certain plastics, antimony oxide can be used.-Inorganic silicate complex is a synergistic agent, which not only has low cost, but also has low color intensity. In addition, antimony compounds, magnesium compounds-When the zinc compound compound is used as a synergistic agent, it can not only improve the flame retardant effect, but also suppress smoke.

Zinc Stearate/Talcum powder/Iron compound is a low smoke synergist, adding the right amount of this synergist, can make some halogen-containing flame retardant plastic initial4minsmoke density from300Down100, the light transmittance from0.01%Increase0.1%.

Certain plasticsHIPSandABSThere are also synergistic effects between bromine and chlorine flame retardants, for example, the use of mixtures of aliphatic chlorine flame retardants and decabromodiphenyl ether for flame retardancy.ABSThe ratio of the two is1:1when,ABSThe oxygen index reaches40Above.