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Flame retardant material for mine flame retardant conveyor belt
China's coal mining industry has developed towards high efficiency and high yield. The transportation technology of the coal mining industry needs to meet the standards of high belt speed, long distance, high power and large capacity, and the standard for flame retardant conveyor belts is further improved. Flame retardant materials for fire-retardant conveyor belts for coal mines are required to be both flame retardant and antistatic. Baoding Jingbo Rubber Co., Ltd. introduces the formula of several flame retardant materials here.
1. Halogen-bismuth complex system
The hafnium complex system is a relatively stable flame retardant system. Principle: During the combustion of rubber, halogen radicals and hydrogen halides are generated. The halogen radicals can capture the flammable active hydroxyl groups, and the flammable active hydroxyl groups are decomposed by combustion. This composite system can suppress the chain reaction of combustion and suppress the combustion. The hydrogen halide gas has a high density and cannot be burned to isolate the flame from the air, and has a good flame retardant effect.
2. Nitrogen flame retardant system
Nitrogen-based flame retardants develop late compared to other flame retardants, and their flame retardancy is not very good, and they are often used in combination with other flame retardants. The addition of nitrogen can promote the carbonization of the phosphorus system and has a synergistic effect. Nitrogen-based flame retardants are mainly melamine and melamine cyanurate. The biggest advantage of this product is its good lubricity and high temperature resistance. Melamine cyanurate (MCA) has a layered structure similar to graphite and good lubricity. The nitrogen content is more than 49%, and the thermal stability is excellent below 300 ° C. The MCA has the advantages of good flame retardant effect, less processing fumes, and no toxicity and taste. The biggest advantage of the MT668 conveyor belt covering rubber is stable lubrication under conditions of high temperature, high speed, low temperature, low speed or sudden temperature difference. characteristic. It exhibits excellent lubricity at the beginning of the belt roller friction test. It is a high flame retardant after forming a carbonized layer and is a good flame retardant. Therefore, it is very necessary to use a nitrogen-based flame retardant system when formulating the MT668 conveyor belt.
3. Phosphorus-based flame retardant system
Phosphorus-based flame retardants include organic phosphorus and inorganic phosphorus flame retardants. There are many varieties, such as the commonly used phosphate esters. It is generally considered that the flame retardant acts in both the condensed phase and the gas phase, and is mainly composed of a condensed phase. The flame retardant mechanism varies depending on the chemical structure, polymer type and combustion conditions of the phosphorus flame retardant used.
In addition, there are inorganic flame retardants, the main element is aluminum hydroxide, and aluminum hydroxide is combined with some inorganic materials to improve flame retardancy.
Design highlights of Jingbo corrugated conveyor belt