Supply of ppr pipe pert to warm the pipe production in Shandong Matilda Pipe 

 Supply of ppr pipe pert to warm the pipe production in Shandong Matilda Pipe 
 About PPR basic 

 PP-R English name is a random Polypropylene (copolymer in), PP-R is short for polypropylene random copolymer is also used to refer to the cold water pipes and hot water for conveying material. PP-R pipe, also known as polypropylene pipes, polypropylene random copolymer, random copolymer polypropylene by extrusion to become a pipe, injection into the pipe. A polypropylene random copolymer is polypropylene, the basic structure of the polymer chain to be modified by adding different types of monomer points. Ethylene is the most commonly used monomers, which caused the polypropylene physical properties change. Compared with the pp homopolymer, random copolymer to improve the optical properties (increased transparency and reduced cloud fog), improved impact resistance, an increase of flexible, reducing the melting temperature, which also reduces the heat fusion temperature ; chemical stability, isolation and organoleptic properties of water vapor (low odor and taste) and the homopolymer is basically the same. For use in blow molding, injection molding, film and sheet extrusion processing areas for food packaging materials, pharmaceutical packaging materials and daily consumer goods. 




 The PPR-manufacturing method 

 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 of the low melting point of 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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