[Supply] ppr pipe production ppr pipe sales Shandong Liaocheng Matilda 

 [Supply] ppr pipe production ppr pipe sales Shandong Liaocheng Matilda 
 PPR-manufacturing methods 

 Ethylene / propylene random copolymer is the simultaneous polymerization of ethylene molecules and propylene molecules in the system, the reactor and the production of PP homopolymer. Ethylene molecule is smaller than the propylene molecule (reactivity, the reaction is faster than about ten times) propylene. This allows the stereotactic weakening of the catalyst while the activity increases, resulting in the increase in atactic polypropylene production. In order to reduce the generation of random things, the need to reduce the reaction temperature, thereby reducing the activity of the catalyst and reduce the random isomer of the final product, to get a more balanced performance products. 

 Deal with high ethylene content (> 3%) random copolymer in the production process more difficult, it is difficult to polymerization in hexane diluent, because the two by-products of the reaction (atactic polypropylene containing ethylene content high copolymer) can be dissolved in hexane. This is the same in the body of liquid propylene polymerization, despite the low solubility. Hexane dilution process to produce a large number of by-products must be separated in hexane recirculation phase, which will increase the total cost of production, however, was able to get a small amount of soluble components cleaner polymer. In the bulk polymerization process, these impurities will remain in polymers, and trouble in dealing with the thin sheet material. Moreover, the final copolymer products contain more soluble impurities. The use of organic solvents to a second washing can remove most of the impurities, but will increase the total cost of production of the copolymer. In general, high levels of byproduct flake random copolymer will become more sticky, when the ethylene content higher than 3.5% (weight), the problem is more prominent. 

 The copolymer melting point lower and directly related to the ethylene content. It is reported that the ethylene content of 7%, the copolymer melting point as low as 152 ° F X3 content of the copolymer melting point greater than the child and the impact of the higher gene content. It also depends on the catalyst itself, instead of the combination of ethylene groups in X5 X3 groups. 

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