Except for a few SBR, most SBR products are flammable or combustible raw materials like natural rubber. At this stage, the key choice is to add halogen-free flame retardant or flame retardant filler and blend with fire retardant materials to improve Sandblasting pipe Flame retardant grade. In addition, it is also a reasonable way to let people have flame retardant functional groups in a single unit when converging. Improving the cross-linking density of sandblasting pipes is also a good hazard to flame retardancy. The flame retardancy of vulcanized rubber is briefly introduced in detail below.

1. Nitrogen compound vulcanized rubber

Nitrogen compound vulcanized rubber includes NR, SBR, BR, IIR, EPR, EPDM, etc. Although NBR does not belong to nitrogen compound vulcanized rubber, its flame retardant technology is very similar to that of nitrogen compound vulcanized rubber, so it belongs to nitrogen compound vulcanized rubber.

The flame retardant grade of nitrogen compound vulcanized rubber is about 19~21, the decomposition reaction temperature range is 200~500 ° C, its high temperature resistance and flame retardant grade are generally weak, and most of the dissolved substances during ignition are flammable gases. The flame retardancy of this kind of vulcanized rubber is usually below the technical level.

Blending with flame retardant polymer compounds, such as polyethylene, gasified high-pressure polyethylene, chlorosulfonated high-pressure polyethylene, butadiene vinyl acetate and other polymer compounds, can moderately improve the flame retardant grade of nitrogen compound vulcanized rubber. When blending, we should pay attention to the problems of miscibility and co chemical crosslinking.

In addition, halogen-free flame retardant is an effective way to improve the flame retardant level of nitrogen compound vulcanized rubber, and halogen-free flame retardant is used to further improve the actual effect of flame retardancy. The most common halogen-free flame retardants are organic chemical halogen-free flame retardants, in which perchlorocyclopentadecane, decabromodiphenyl ether, chlorinated paraffin 52, etc. are widely used. In addition, antimony trioxide is the majority of inorganic flame retardants used, followed by zinc borate, hydrated aluminum trioxide, ammonium gasification, etc. During application, it should be noted that halogen free flame retardants should not contain dispersed halogens. During production, dispersed halogens will erode machines, equipment and abrasives, which will have a negative impact on the electrical properties and brittleness of vulcanized rubber. In addition, pay attention to the negative impact of the use of halogen-free flame retardant on the physical properties of vulcanized rubber.

In addition, flame-retardant inorganic fillers such as calcium bicarbonate, clay, light calcium powder, white carbon black, aluminum chloride, etc. are added to minimize the proportion of flammable organic chemical substances. Calcium bicarbonate and aluminum oxynitride have thermoelectric effect when dissolved. This kind of method will reduce some physical and physical properties of plastic particles, and the filling amount cannot be very large.

Improvement Sandblasting pipe The cross-linking density experiment of the vulcanized rubber proved that increasing the cross-linking density of the vulcanized rubber can improve its flame retardant grade. Therefore, the flame retardant grade of vulcanized rubber can be improved. This may be caused by the temperature rise of plastic particle decomposition reaction. This kind of method has been used in EPDM.