What Are The Factors Affecting The Effect Of Flame Retardants?

Why do powder flame retardants work differently? Everyone in the flame retardant industry knows that.
The way to complete the flame retardant is: in the process of consumption, flame retardant on average to participate in the product, most manufacturers of the common problem is: flame retardant effect is not obvious, flame retardant is not average, in the same product, some central flame retardant effect is obvious, some central flame retardant effect is poor and not flame retardant. The flame retardant effect of the same flame retardant is very good on the board consumed by one machine, and very poor on another machine, and the flame retardant performance of the same machine and different manufacturers varies greatly.
First, due to human factors, the flame retardant dose added to the extruded plate is very small, generally less than 10%, in order to make the flame retardant evenly distributed in the data, mixing is the key local. In order to make every 100 grams of information contains about 5 grams of flame retardant on average, can imagine, the need for a large number of people or special mixer to stop mixing, most manufacturers will directly spray flame retardant on the list of information, the appearance is directly into the feeder, although the feeder is equipped with my mixing installation, but in a short time can only constitute a small local dispersion, and then the extrusion, Fangshan wall paste foil rock wool board, produce part of the flame retardant effect.
Second, due to the influence of equipment elements, different equipment manufacturers have different design processes for screw clearance, propulsion speed, plasticizing and dispersing, resulting in different residence time of materials plasticizing and dispersing in the screw barrel body. Conventional flame retardants are mainly hexabromocyclododecane, whose synthesis temperature is lower than that of rockwool board, which is in contradiction with the processing temperature of ordinary extruded board. The heating temperature of ordinary board is enough to make the synthesis of large local flame retardants fail. Therefore, we usually use melt temperature as the specification of xps extruded board, rather than heating temperature, practice consumption proves that the manufacturer thinks that when the melt temperature is between 175-190℃ conditioning, the board quality and flame retardant effect can be achieved. This processing temperature is contrary to the process temperature provided by most equipment manufacturers, mainly because the equipment consumption process is based on the condensation temperature of the new entrusted polystyrene particles. In practice, 90% of the xps extrusion plate is consumed with recycled ps particles, and the melting temperature difference between the regenerated ps and the new data is 20~30℃. Screw cutting data produce a lot of shear heat, shear heat is transmitted to the data and extrusion, equipment shear heat accumulation is higher and higher, if in the long-term consumption process of heating temperature and cooling water do not stop conditioning, will also form flame retardant component synthesis failure.