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Flame retardants commonly used in rubber include organic flame retardants and inorganic flame retardants.
编辑:Fujian Wynca Technology Co.,Ltd时间:2019-06-11

As a kind of polymer compound, rubber has its own unique point of combustion, and the process is more complicated. The combustion temperature is generally higher than other substances, mostly above 3000 degrees. The combustion process can be divided into three stages, thermal decomposition, combustion, and continuation. combustion. In the thermal decomposition stage, after reaching high temperature, the rubber is first depolymerized and melted and decomposed into low-molecular-weight polymers. There will be no open flame at this stage; the combustion stage is due to the mixture of thermal decomposition products and oxygen in the air, accompanied by light and heat, The combustion is formally produced and decomposed to produce carbon monoxide, carbon dioxide and smoke. The halogen-free rubber also has a continuous combustion stage, which can promote the rubber to continue to burn until the combustibles are completely exhausted.

Flame retardants can usually play a role in cooling and absorbing heat, isolating oxygen sources and preventing further combustion. As a special additive for rubber, it can also play a role in plasticizing, modifying and filling. Flame retardants commonly used in rubber include:

Organic flame retardant

(1) Halogen element: The density of hydrogen halide produced by the combustion of this type of substance is greater than that of air, and the sinking acts as a barrier to oxygen. Rubber mainly burns with a hydrocarbon-based structure. The oxygen index of halogen-containing rubber is higher than that of halogen-free rubber. Therefore, the flame retardant performance of halogen-containing rubber is indisputable, but its combustion will produce corrosive and Toxic hydrogen halide, this is not suitable for safe occasions, so other high-performance flame retardants should be developed and utilized.

(2) Phosphorus flame retardant: Based on phosphate ester, it also has the function of plasticizing and modifying. The flame retardant effect increases with the increase of carbon atoms in the alkyl group, and the overall effect is relatively good.

Inorganic flame retardant

Including non-combustible powders such as hydroxides, inorganic salts, metal oxides, etc., the advantage is that the cooling and insulating effect is strong, and the internal heat model can be flame-retardant by diluting the concentration of combustibles.

The disadvantages are:

1. It must be used in large quantities, and too much use may cause difficulties for rubber and plastics;

2. Excessive addition leads to a decrease in the overall performance of the rubber compound;

3. Some metal compounds may be more expensive.

In the process of adding flame retardants to rubber, the coordination between flame retardant effect, performance, cost and safety should be fully considered. Therefore, the principle of combining safety and efficiency with smokeless and non-toxic should be followed, and the coordination of multiple flame retardants should be considered. Use and complement each other's advantages to achieve the best results.