`,EVA 624ㄨLong term supply PP a monomer for polymerization of propylene into Junju polypropylene, another is DI produced by a reaction kettle homopolymer PP into the formation of ethylene propylene ethylene copolymer, ethylene propylene elastic segment is formed. The PP-B resin is essentially a copolymerization modification of homopolymerization PP with ethylene. The modified PP-B resin has the advantages of both PE and PP. PP-R is a random polypropylene modified by ethylene on the basis of copolymerization PP. The molecular weight of the random Zui is only tens of thousands of PP. The cohesive force is small, the melting point is low and the mechanical properties are poor. Only the random PP modified by ethylene can be used in practice. The modification process is that the propylene is gasified and fed into the reaction vessel by gas phase method. The material is sent from the DI reactor to the second reactor with an air lock system, and ethylene is added to the second reactor. The propylene catalyst with high activity and high selectivity was added to the upper part of the reactor and stirred evenly on the powder layer by stirring. The copolymer was formed by controlling the ratio of ethylene to propylene. The polymer changes the conformation of the PP chain and causes ethylene to polymerize randomly and uniformly on the molecular chain of PP. Compared with ordinary PP, PP-R material stress crack resistance has been greatly improved, and the temperature in the internal and external pressure, the performance degradation is very slow, is currently used for the production of conveying hot water Zui is one of the ideal materials. PA66 (polyamide 66 or nylon 66) is more widely used in the automotive industry, instrument shells, and other products that require impact resistance and high strength than PA6, PA66. Polyamide resin, English name polyamide, referred to as PA. Commonly known as Niron (Nylon), it is a macromolecular backbone, repeating units contain amide groups of polymers. For the five major engineering plastics in the production of Zui large, varieties of Zui more, Zui wide range of uses. The main varieties of nylon of nylon 6 and nylon 66, accounting for Jue of the dominant position, Chinese nylon 66 English name Polyamide 66 also known as nylon 66 abbreviation nylon 66CAS number 32131-17-2 component poly two acyl hexanediamine scope machinery, automobile, electrical apparatus parts The chemical and physical properties of PA6 are similar to those of PA66, however, it has a lower melting point and a wide range of process temperatures. Its impact resistance and solubility are better than PA66, but its moisture absorption is stronger. Because many of the quality characteristics of plastic parts are subject to moisture absorption, so the use of PA6 design products should take full account of this. In order to improve the mechanical properties of PA6, a variety of modifiers are often added. Glass fiber is a common additive for Zui, and sometimes synthetic rubber is added to improve impact resistance, such as EPDM and SBR. For products without additives, PA6 shrinks between 1% and 1.5%. Adding glass fiber additives can reduce the shrinkage to 0.3% (but slightly higher than the vertical direction of the process). The shrinkage of molding assembly is mainly affected by the crystallinity and moisture absorption of the material. The actual shrinkage ratio is also related to the design of plastic parts, wall thickness and other process parameters. PC / / /PBT 1030 alloy material with high impact resistance, excellent weatherability and strength, can be applied to car bumper, car door handles etc.. High weather resistance of PC / / /ASA 1025 alloy material with high heat resistance and weatherability, excellent impact resistance, can be applied to the car dashboard, column type radiator grille cover, etc..