Low smoke zero halogen flame retardant polyolefin cable material usually adopt flame polyolefin blend resin plus filler aluminum hydroxide, magnesium hydroxide, and some in order to improve longevity heat-resistant and adding suitable amount of antioxidants. Sometimes in order to reduce smoke during burning, also added some smoke inhibitor, such as vanadium, nickel, molybdenum, iron, silicon, nitrogen compounds. The mechanism of flame retardant for: when burning, flame retardant filler aluminum hydroxide, magnesium hydroxide can release water of crystallization, absorb a lot of heat; Dehydration reaction, meanwhile, will generate large amounts of water vapor, it can dilute combustible gases, to prevent burning, also can be in material surface forming a layer of molten oxide scale of non-combustible, which cut off access to polymer hot oxygen reaction with the outside world, eventually material, self-extinguishing flame retardant
Calcium carbonate was used to plastic industry a large number of is not accidental, compared to other non-metallic mineral powder material, calcium carbonate has obvious advantages. 1) Inexpensive Both TSP and light calcium are the cheapest in a variety of non-mineral powder materials, meaning that any non-mineral powder material will only attempt to replace calcium carbonate as a plastic filler rather than highlighting this The characteristics of the powder material itself, it is meaningless.
2)color is good ,is easy to put color,could make color light plastic product. Inadvantage is the plastic product color is not enough bright.in most cases is acceptable.
3)low hardness,much less than the manufacturing processing machinery equipment and molding hardness.so the wear is light to the contact parts (screw,barrel etc) and molding.
4)Good thermal stability and chemical stability
5)Is easy to dry ,without crystallographic water, and the moisture of adsorption is easily removed by heating.
6)avirulent, without excitant, tasteless, especially our country is rich in calcite, marble, limestone resources, choose room is big, the vast majority of resources are of good quality, especially the heavy metal content is extremely low, to fulfill the requirements of national health level.
High filling master-batch usually adopt machine type:
1.Kneader + GL single screw extruder
Preprocess :pressurized mixer
Pelletizing equipment:single screw series
Cutting machine :air cooling hot cutting
Model M20+GL 80 single screw
single screw motor power less than 37Kw,L/D<22:1