The types of flame retardants have different effects due to different appearance properties, such as powder, particle and masterbatch.
    Masterbatch is made of flame retardant, plastic carrier and dispersant heated by extruder, in which the flame retardant composition will account for 40-50%. Masterbatch has good dispersibility, sanitary use and no dust, but its disadvantage is high cost. Flame retardant will inevitably have a certain loss after one heat treatment. If the flame retardant in Masterbatch is ordinary hexabromocyclododecane which is not temperature resistant, the same is true There are problems of decomposition failure and corrosion of equipment.
    Powdered flame retardant has been used for a long time and is widely used with good economy and flame retardant effect. The disadvantage is that it is different from the proportion of plastic particles and easy to layer. When using powdered flame retardant, attention should be paid to the selection of mixing equipment to avoid settlement and layering. It has good effect when used with PS powder. In addition, the flame retardant with good stability must be selected. Due to the limitation of equipment and process, the domestic hexabromocyclododecane can not reach the decomposition temperature above 230 ℃ of Abbott, so it can be directly used only after resin surface coating treatment. (the method of adding heat stabilizers is not feasible in practical application. A small amount of heat stabilizers and flame retardants are separated from each other in the molten resin, which can not play the role of decomposition of flame retardants.)
    Granular flame retardant is a kind of powder flame retardant, which is made into particles by dry extrusion. It does not add any impurities, does not go through heat processing, and has no material decomposition loss. Its composition is the same as that of powder, and its dosage is the same. Its specific gravity is close to that of PS particles, which solves the problem of uneven dispersion of powder products. It is an upgraded product, and more and more manufacturers begin to choose it.