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Method of flame retardant rubber products manufacturing

except for a few synthetic rubber, but like most natural rubber and synthetic rubber products, are flammable or combustible materials. Is mainly used to add flame retardant or flame retardant fillers and blended with fire-retardant materials modification to improve flame retardancy. In addition, aggregate matter of flame retardant in the monomer when groups are also effective methods of flame-retarding technology and improve rubber cross-link density also has a good influence on flame retardant. Flame-retarding technology of rubber introduced below.

1. wide rubber hydrocarbon

hydrocarbon rubbers include NR, SBR and BR, IIR, and EPR, EPDM etc. NBR rubber is not a hydrocarbon, but its flame retardant rubber technology and hydrocarbons are very similar, so the home rubber hydrocarbon processing.

hydrocarbon rubbers between the oxygen index is about 19-21, the thermal decomposition temperature range is 200 ~ 500 ° c, its heat resistance and flame retardant is generally poor, most of the decomposition products are flammable gases when burned. This type of flame retardant rubber commonly used technologies are as follows.

blending with flame retardant polymers such as PVC, Qi polyethylene, chlorosulfonated polyethylene, ethylene-vinyl acetate polymer blends can be appropriately high hydrocarbon flame retardant for rubber. In blending should pay attention to when considering compatibility and cross-linked questions.

Add flame retardant which is a hydrocarbon rubber high flame retardance of important ways, and the use of fire retardant and synergies to further improve the effect. Common flame retardants are organic halogen-free flame retardant, including total chlorin e GUI Huan, Decabrominated diphenyl ethers, chlorinated paraffins and other more. Using inorganic antimony trioxide flame retardant to the majority, followed by zinc Borate, ammonium hydrate alumina, Qi, and so on. Note When using halogen-free flame retardants do not include Bittern, because in the process, free corrosion of brine equipment and tooling, electric and aging properties of rubber has adverse effects. Keep in mind the amount of flame retardant adverse effects on mechanical properties of rubber.

Add flame retardant fillers such as calcium carbonate, kaolin, talc, silica, aluminum hydroxide, to minimize the proportion of combustible organic substances. Calcium carbonate, nitrogen oxide has dissolved with heat-absorbing. This will reduce some physical and mechanical properties of the material, content is not too big.

high rubber cross-link density test showed that rubber cross-link density can increase the oxygen index. Might improve the flame retardancy of rubber. This may be caused due to thermal decomposition temperature rubber compound. This approach has been applied in ethylene-propylene rubber.

halogen-containing rubber: halogen-containing rubber contain halogen elements, oxygen index generally between 28 to 45, even more than 65 FPM for oxygen index. Halogen-containing high halogen content in rubber, the oxygen index is higher. This type of rubber itself has a high flame retardant, fire self-extinguished. So its hydrocarbon rubber fire retardant treatment than easy. To further improve the halogen-containing flame retardant for rubber, usually by adding methods of flame retardant.

rubber miscellaneous chains: are two of the most representative of this type of rubber silicone, the oxygen index is about 25, thermal decomposition temperature of 400-6001. Means of flame retardant in fact is the higher the thermal decomposition temperature, increasing the thermal decomposition of residue of combustible gases, slow speed.