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The selection of polypropylene
by：CSSSLD
2021-01-23
Metallocene catalytic polymerization of polypropylene homopolymer can produce low set of approximate random regularity of the structure to the regularity of the Gao Ligou metallocene polypropylene, low regularity of the vertical structure of PP injection molding processing plant with high toughness and transparency, Gao Ligou regularity of PP with high rigidity.
Using metallocene catalyst polymerization syndiotactic PP made a breakthrough, compared with PP homopolymer, syndiotactic PP has low density, low crystallinity, spherulite characteristics of small size, high transparency, good toughness, shows a good application prospect in packaging.
There are numerous PP, modified varieties, generally in the form of special PP material supply cars, household appliances, such as film production enterprises, products to meet specific performance requirements.
in the PP homopolymer except in order to meet the requirements of processing and using and add a small amount of antioxidant thereof, no longer to join other additives, so pure. Its performance mainly depends on the isotactic degree and relative molecular mass, processing and use has close relationship with MFR. PP homopolymer adapt to all kinds of processing methods, widely used. PP copolymer mainly include polypropylene random copolymer and impact resistant PP copolymer.
PP after filling its density, rigidity, hardness and heat resistance increased, while the tensile strength and toughness is decreased; Fiber reinforced PP in addition to maintain the original excellent properties of PP, the tensile strength, rigidity, hardness, impact strength, heat resistance and creep resistance are greatly increased, and little shrinkage, good dimensional stability. Metallocene polypropylene refers to using metallocene catalyst polymerization of PP.
PP random copolymer is inserted in the main chain of the PP without rules made by different monomer molecules, the most commonly used is ethylene copolymerization monomer, content is 1% 7%. Vinyl monomer random embedded hindered the crystallization of PP, its performance will vary. Compared with PP homopolymer and PP random copolymer has good transparency, impact resistance and toughness at low temperature, melting temperature decrease easier to heat sealing. But the rigidity and hardness decreases. Of PP random copolymer is mainly used for high toughness requirements in the film, pipes, hollow products and plastic injection products.
impact resistant PP copolymer of vinyl monomer content can be as high as 20%, such as polymerization process is relatively complex, some of them are PP block copolymer, the product contains the rubber phase is why it has a high impact ability. Impact resistant PP copolymer overcomes the drawback of lack of PP homopolymer toughness, retained the easy processing and the characteristics of excellent physical performance, so a large number of used in automobile, household tools, hollow container, hot forming sheet, etc.
PP on food hygiene belongs to the safety of resin varieties, can be used in food packaging, and cooking sterilization can be performed. But the PP is easy to aging, therefore in the PP plastic cuhk has more antioxidants, light stabilizer and so on, should pay attention to the impact of these plastic additives for PP health. PP with low price, qualitative light, high temperature, high rigidity and high tensile strength, easy processing, and copolymerization, blending, filling, enhancement, cross-linking foaming in the application of PP modification technologies such as making its performance improvement, constantly increasing varieties, these are PP use expanding, increasingly widely used.
called containing granular packing PP filled PP, called PP containing fibrous filler reinforced PP. In fact, in recent years with granular the details of packing and surface treatment of the development of technology, such as the boundaries between the two has become blurred. Injection molding products processing PP packing is commonly used calcium carbonate, talc and glass fiber. In order to improve the affinity of filler dispersion and resin, can be carried out on the packing surface treatment.
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in the PP homopolymer except in order to meet the requirements of processing and using and add a small amount of antioxidant thereof, no longer to join other additives, so pure. Its performance mainly depends on the isotactic degree and relative molecular mass, processing and use has close relationship with MFR. PP homopolymer adapt to all kinds of processing methods, widely used. PP copolymer mainly include polypropylene random copolymer and impact resistant PP copolymer.
PP after filling its density, rigidity, hardness and heat resistance increased, while the tensile strength and toughness is decreased; Fiber reinforced PP in addition to maintain the original excellent properties of PP, the tensile strength, rigidity, hardness, impact strength, heat resistance and creep resistance are greatly increased, and little shrinkage, good dimensional stability. Metallocene polypropylene refers to using metallocene catalyst polymerization of PP.
PP random copolymer is inserted in the main chain of the PP without rules made by different monomer molecules, the most commonly used is ethylene copolymerization monomer, content is 1% 7%. Vinyl monomer random embedded hindered the crystallization of PP, its performance will vary. Compared with PP homopolymer and PP random copolymer has good transparency, impact resistance and toughness at low temperature, melting temperature decrease easier to heat sealing. But the rigidity and hardness decreases. Of PP random copolymer is mainly used for high toughness requirements in the film, pipes, hollow products and plastic injection products.
impact resistant PP copolymer of vinyl monomer content can be as high as 20%, such as polymerization process is relatively complex, some of them are PP block copolymer, the product contains the rubber phase is why it has a high impact ability. Impact resistant PP copolymer overcomes the drawback of lack of PP homopolymer toughness, retained the easy processing and the characteristics of excellent physical performance, so a large number of used in automobile, household tools, hollow container, hot forming sheet, etc.
PP on food hygiene belongs to the safety of resin varieties, can be used in food packaging, and cooking sterilization can be performed. But the PP is easy to aging, therefore in the PP plastic cuhk has more antioxidants, light stabilizer and so on, should pay attention to the impact of these plastic additives for PP health. PP with low price, qualitative light, high temperature, high rigidity and high tensile strength, easy processing, and copolymerization, blending, filling, enhancement, cross-linking foaming in the application of PP modification technologies such as making its performance improvement, constantly increasing varieties, these are PP use expanding, increasingly widely used.
called containing granular packing PP filled PP, called PP containing fibrous filler reinforced PP. In fact, in recent years with granular the details of packing and surface treatment of the development of technology, such as the boundaries between the two has become blurred. Injection molding products processing PP packing is commonly used calcium carbonate, talc and glass fiber. In order to improve the affinity of filler dispersion and resin, can be carried out on the packing surface treatment.
more excellent articles: polypropylene crystallization, click directly.
http://www。 csssld。 cn//html/2017/Info_0928/685。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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