PP PIPE
PP pipe is a semi crystalline material. It is harder and has a higher melting point than PE. Due to the brittleness of homopolymer type PP at temperatures above 0 ℃, many commercial PP materials are irregular copolymers with 1-4% ethylene added or clamp copolymers with higher ethylene content. Copolymer type PP materials have lower thermal distortion temperature (100 ℃), low transparency, low glossiness, and low rigidity, but they have stronger impact strength. The strength of PP increases with the increase of ethylene content. The Vicat softening temperature of PP is 150 ℃. Due to its high crystallinity, this material has excellent surface stiffness and scratch resistance.
PP does not have environmental stress cracking issues. Usually, PP is modified by adding glass fiber, metal additives, or thermoplastic rubber. The flow rate of PP has an MFR range of 1-40. PP materials with low MFR have better impact resistance but lower tensile strength. For materials with the same MFR, the strength of copolymer type is higher than that of homopolymer type. Due to crystallization, the shrinkage rate of PP is quite high, generally ranging from 1.8 to 2.5%. And the directional uniformity of shrinkage rate is much better than materials such as PE-HD. Adding 30% glass additive can reduce the shrinkage rate to 0.7%. Both homopolymer and copolymer type PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and dissolution.
However, it has no resistance to solvents such as aromatic hydrocarbons (such as benzene) and chlorinated hydrocarbons (carbon tetrachloride). PP does not have the same antioxidant properties as PE at high temperatures.
Polypropylene (PP) is a lighter type of common plastic with excellent electrical properties, and can be used as a high frequency insulation material that is resistant to moisture and heat. PP is a crystalline polymer that exhibits a significant shrinkage rate (1.0% -1.5%) during melt condensation due to significant changes in specific volume and high degree of molecular orientation. PP has little effect on reducing its viscosity by increasing temperature in the molten state. Therefore, in the molding process, the main focus should be on increasing the injection pressure and shear rate to improve the quality of the product.
PE PIPE
The full name is Polythene, which is the simplest polymer organic compound and the most widely used polymer material in the world today. It is polymerized from ethylene and can be divided into high-density polyethylene, medium density polyethylene, and low-density polyethylene according to different densities.
Low density polyethylene is relatively soft and is often polymerized under high pressure; High density polyethylene has the characteristics of rigidity, hardness, and high mechanical strength, and is commonly used for low-pressure polymerization. High density polyethylene can be used as containers, pipelines, and high-frequency electrical insulation materials for radar and television. Low density (high-pressure) polyethylene is commonly used in large quantities. Polyethylene is wax like and has a waxy smoothness. When not dyed, low-density polyethylene is transparent, while high-density polyethylene is opaque. Polyethylene is a high polymer chain formed by the addition and polymerization reactions of ethylene (CH2=CH2), connected by repeated - CH2- units. The performance of polyethylene depends on its polymerization method; High density polyethylene (HDPE) is produced by Ziegler Natta polymerization under the catalytic conditions of organic compounds under moderate pressure (15-30 atmospheres).
The polyethylene molecules polymerized under these conditions are linear, with long molecular chains and a molecular weight of several hundred thousand. If free radical polymerization is carried out under high pressure (100-300 MPa), high temperature (190-210 C), and peroxide catalyzed conditions, low-density polyethylene (LDPE) is produced, which has a branched structure.
Polyethylene is insoluble in water and has little water absorption. It only slightly dissolves in some chemical solvents, such as toluene and Acetic Acid, at temperatures above 70 ℃. However, particulate polyethylene can melt or solidify with temperature changes between 15 ℃ and 40 ℃, and melt and absorb heat as the temperature increases; When the temperature decreases, it solidifies and releases heat. Because it has a small water absorption capacity, is not easily damp, and has insulation performance, it is a good building material.
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