Supply of ppr pipe manufacturer prices, ppr pipe manufacturer, Matilda Pipe 



 Supply of ppr pipe manufacturer prices, ppr pipe manufacturer, Matilda Pipe 




 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. 








 The main performance of the PPR- 

 Polypropylene tube divided into homopolymer polypropylene (PP-H), block copolymer polypropylene (PP-B), and atactic polypropylene (PP-R) 3. PP-H, PP-B, PP-R pipe stiffness descending order of impact strength followed. Water supply polypropylene tube is made of extraordinary PP-R. PP-R pipe as a new type of pipe, with the following characteristics: 2.1 Energy Saving PP-R pipe production energy consumption is only 20% of the steel pipe, and its low thermal conductivity of 0.2W / (mK)] steel is only 1/200, applied to the hot water system will greatly reduce heat loss. 2.2 The corrosion-resistant, non-scaling, health, non-toxic use of PP-R pipe can be removed from the use of galvanized steel caused by the inner wall scaling, rust caused by water quality "secondary pollution". PP-R group were simple, the basic components of carbon and hydrogen, in line with food hygiene regulations, non-toxic, more suitable for transportation of drinking water. 2.3 heat, pressure, long service life PP-R pipe, long-term use temperature of 95 ° C, short-term use temperature of up to 120 ° C. Use temperature of 70 ° C, working pressure the 1.2MPa conditions, long-term continuous use, life expectancy up to 50 years. 2.4 lightweight, high strength, small fluid resistance PP-R pipe density of only the metal tube 1/8, and resistance to pressure test strength up to 5MPa, and good toughness, impact resistance. Smooth wall, no rust, no scaling, the fluid resistance is small. PP-R pipe of the main technical indicators are as follows: density of of 0.9g/cm3 elastic modulus (20 ° C) the 800MPa thermal expansion coefficient 1.8 × 10-4 / K, the thermal conductivity of 0.2W / (mK of) longitudinal contraction rate of 2% impact test breakage rate ≤ 10% 1h hydraulic test short-term, ring stress 16MPa no leakage long-term 95 ° C, 1000h, ring stress 3.5MPa seepage table a pipe properties of several materials. 

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