Filled polypropylene and halogen-free low smoke polypropylene
DATE：2023/1/3 8:43:36 / READ： / SOURCE：This station
2.2.7 Filled polypropylene
Polypropylene filling refers to mixing polypropylene resin with a certain proportion of fillers (such as calcium carbonate, talcum powder, asbestos, mica and wood powder) and some necessary additives, mixing and mixing evenly, mixing and plasticizing with an extruder, and then extruding for granulation. This granular material is filled with polypropylene.(1) Performance characteristics
The performance of filled polypropylene is related to the content of filler, the performance of filler, the type, particle size, shape of filler, and the dispersion state and uniformity in polypropylene resin. The properties of filled polypropylene are usually characterized by good heat resistance, low shrinkage of molded products, good dimensional stability and high hardness. If the amount of filler is relatively high, the properties (such as heat resistance, cold resistance, mechanical properties and processability) of this kind of filled polypropylene are better than those of pure polypropylene resin molded products; However, the gloss, toughness and elongation at break of the products are obviously reduced.
The performance comparison between calcium carbonate filled polypropylene and pure polypropylene resin is shown in Table 2-55. The performance comparison between mica, talcum powder and glass fiber filled polypropylene and pure polypropylene is shown in Table 256. The properties of filled polypropylene produced by Beijing Yanshan Petrochemical Company, China Blue Chenguang Chemical Research Institute and Shandong Dawn Chemical Co., Ltd. are shown in Table 2-56~Table 2-59.
(2) Forming method and application
Filled polypropylene can be molded by injection molding, blow molding and foaming. Injection molded products filled with polypropylene can be used as parts in machinery, automobiles, instruments and household appliances. For example, calcium carbonate filled polypropylene injection molding products can be used as car guards, copier parts, microwave oven parts, integrated circuit 1-C carrier plates and toys. talc
Powder filled polypropylene can be used for injection molding of pump body, pump cover, support, bearing cover and instrument handle. Fan and other equipment parts. Mica filled polypropylene can be used for injection molding of automotive parts, air conditioners and fan blades. Asbestos filled (asbestos accounts for 40%) polypropylene can be injection molded into automobile structural parts, washing machine parts and blades on the engine. It has good rigidity under 140 ℃ high temperature environment, stable structural dimensions and good durability.
2.2.8 Halogen free low smoke polypropylene
Polypropylene resin is mixed with magnesium hydroxide, lubricant, antioxidant and some auxiliary additives that have been treated with the treatment agent according to a certain proportion. After the mixture is even, it is mixed with an extruder for plasticization, and then extruded for granulation, that is, halogen-free low smoke polypropylene.Halogen free low smoke polypropylene products have good mechanical properties, and the flame retardancy reaches FV-0 level. This material is mainly used in wire and cable, electronic and electrical industry to manufacture various internal parts and protective equipment and decorative plywood in the welding of electronic components.
Author：admin