Three reasons why the effectiveness of flame retardants varies greatly

1. Human factors, the amount of flame retardant added in the extrusion plate is small, generally less than 10%, so that flame retardant evenly distributed in the material, stirring is the most important part, in order to make every 100 grams of material evenly contains about 5 grams of flame retardant, need a lot of artificial mixing and professional mixer mixing, many manufacturers directly sprinkle flame retardant on the surface of the material directly to the feeder, Although the feeder stirred itself, but in a short time can only form a small area of dispersion and be extruded, on the outside wall of Fangshan
2. Equipment factors, different equipment manufacturers push screw nut clearance, speed, design technology of plasticized dispersed nuts is different, the material in the nut plasticized, dispersed, residence time is also different. The usual flame retardant is hexabromocyclododecane. We usually take melt temperature as the standard of flame retardant plate. It is not heating temperature, but the shear heat of the screw on the material produces a lot of shear heat, which is transferred to the material and extruded out
3. Flame retardant factor, the domestic production of flame retardants are mainly powder and particle two kinds, powder flame retardant density and material particles are different, in the process of stirring friction electrostatic adsorption can only a small part, most of the particle gap precipitates at the bottom of the stirring equipment, flame retardant dispersion is uneven. The powder adsorb on the surface of the particle first contact with the screw nut, encounter high temperature, decomposition is serious, decomposition process of free bromine and screw nut reaction to produce iron bromide spalling, corrosion of equipment is very strong, do not advocate the use of. Particles are flame retardant manufacturers commercial resin composite powder covered, density and volume close to plastic particles, mixing process is easy to evenly dispersed to the middle of the material, extrusion process and screw nut total contact area is small, decomposition is less, so it is widely used. However, the processing conditions of particle materials are relatively strict. Advanced plastic modification equipment needs to cover a small amount of carrier resin with ultra-high content of composite flame retardant components at low temperature. Most of the domestic flame retardant particles are simple single, because of the twin-screw processing, the content of flame retardant components cannot exceed 65%