Polyvinyl chloride.
Basic features:
It is one of the world's largest production of plastic products, cheap, widely used, polyvinyl chloride resin is white or light yellow powder. Depending on the application, different additives may be added, and the polyvinyl chloride plastic may exhibit different physical and mechanical properties. In the polyvinyl chloride resin by adding the right amount of plasticizer, can be made of a variety of hard, soft and transparent products.
Pure polyvinyl chloride density of 1.4g / cm3, adding plasticizers and fillers such as the density of PVC plastic parts is generally 1.15-2.00g / cm3.
Hard polyvinyl chloride has a better resistance to tensile, bending, compression and impact resistance, can be used alone as a structural material.
Soft polyvinyl chloride softness, elongation at break, cold resistance will increase, but the brittleness, hardness, tensile strength will be reduced.
Polyvinyl chloride has a better electrical insulation properties, can be used for low-frequency insulation material, its chemical stability is also good. As the thermal stability of polyvinyl chloride is poor, long-term heating will lead to decomposition, release HCL gas, so that PVC discoloration, so its narrow range of applications, the use of temperature is generally between -15 ~ 55 degrees.
The main purpose:
Because of the high chemical stability, it can be used to make anti-corrosion pipes, pipe fittings, oil pipelines, centrifugal pumps and blowers. Polyvinyl chloride board is widely used in the chemical industry to produce a variety of storage tank lining, building corrugated board, doors and windows structure, wall ornaments and other building materials. Because of electrical insulation performance, in the electrical, electronics industry, for the manufacture of plugs, sockets, switches and cables. In daily life, PVC used in the manufacture of sandals, raincoats, toys and artificial leather, etc.!
Polyvinyl chloride
And polyvinyl chloride
HDPE (high density polyethylene), English full name is High density polyethylene
HDPE is a highly crystalline, non-polar thermoplastic tree
fat. The appearance of the original HDPE was milky white, in a slight cross-section was a certain degree of translucent. PE has excellent resistance to most of the characteristics of life and industrial chemicals. Certain types of chemicals can produce chemical corrosion,
Such as corrosive oxidants (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride). The polymer is non-hygroscopic and has good water vapor resistance and can be used for packaging applications. HDPE has good electrical properties,
In particular, the dielectric strength of the insulation is high, making it suitable for use in wire and cable. Medium to high molecular weight level at room temperature even in the -40F low temperature has excellent impact resistance.
