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The application of PE material
Nov 16, 2018
Polyethylene is a white waxy translucent material that is soft and tough, lighter than water, non-toxic, and has excellent dielectric properties. It is easy to burn and continues to burn after leaving the fire. The water permeability is low and the organic vapor transmission rate is large. The transparency of polyethylene decreases as the crystallinity increases. At a certain degree of crystallinity, the transparency increases as the molecular weight increases. High-density polyethylene has a melting point range of 132-135 ° C, and low-density polyethylene has a lower melting point (112 ° C) and a wide range.
It is insoluble in any known solvent at room temperature, and can be dissolved in a small amount of solvent such as toluene, amyl acetate or trichloroethylene at 70 ° C or higher.


1.Chemical properties

Polyethylene has excellent chemical stability. It is resistant to various chemical substances such as hydrochloric acid, hydrofluoric acid, phosphoric acid, formic acid, amines, sodium hydroxide and potassium hydroxide at room temperature, but nitric acid and sulfuric acid have strong resistance to polyethylene. Destructive effect.


2.Product Usage

High-pressure polyethylene: more than half for film products, followed by pipes, injection molded products, wire wraps, etc.
Medium and low pressure polyethylene: mainly injection molded products and hollow products.
Ultra-high pressure polyethylene: Due to its excellent comprehensive properties, ultra-high molecular polyethylene can be used as engineering plastics.
Melting point 140°C
Melting 292.88J/g


3.Printing

Suitable for products with high performance against water, oil and chemicals. Wuyuan Printing often applies this material to cosmetics, shampoo, washing and other daily chemicals that have moisture and extrusion resistance during use. label. Excellent softness, especially for plastic bags. It can also be used in cases where PVC label materials cannot be used due to environmental requirements.


4.Processing aspect

Polyethylene can be processed by blow molding, extrusion, injection molding, etc., and is widely used in the manufacture of films, hollow products, fibers and household groceries.
Application film
Low-density polyethylene is widely used as a packaging material for various foods, clothing, medicines, fertilizers, industrial products, and agricultural films. It can also be processed into a composite film by extrusion to package heavy objects.


Since 1975, high-density polyethylene film has also been developed, which has high strength, low temperature resistance, moisture resistance, and good printability and processability.
In addition, a polyethylene coating can be extrusion coated on paper, aluminum foil or other plastic film to form a polymer composite.

5.Hollow product
High-density polyethylene has high strength and is suitable as a hollow product. Such as milk bottles, detergent bottles;


6.Tube sheet

The extrusion method can produce polyethylene pipe. The high-density polyethylene pipe has high strength and is suitable for underground laying. The extruded plate can be processed twice. It can also be made of high-density polyethylene by foaming extrusion and foaming injection. Made into low foam plastic for use as a platen and building material; protective cover (eg cable sheath).


7.fiber
China is called ethylene fiber, and it is generally made of low-pressure polyethylene as raw material and spun into synthetic fiber. Ethylene is mainly used in the production of fishing nets and ropes, or as a flake after being spun into short fibers, and also as an industrial acid-resistant fabric.
Developed ultra-high-strength polyethylene fiber (strength of 3 to 4 GPa), which can be used as a composite material for bulletproof vests, automobiles and offshore operations.


8.Miscellaneous goods
Miscellaneous products produced by injection molding include daily sundries, artificial flowers, turnover boxes, small containers, parts for bicycles and tractors, refrigerator containers, storage containers, household kitchen utensils, sealing covers, etc.; Polyethylene.


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