Is one of the largest plastic packaging film in the dosage of a, its molecular structural formula is:
N polyethylene ethylene is obtained by addition reaction is the sum of a group of polymers.
Polyethylene is in homopolymerization and copolymerization, at the same time, also can be linear and nonlinear.
Most of all dancing with ethylene points made from PVC monomer polymerization.
On the contrary, in polyethylene copolymer, ethylene and some small molecule olefins or some polar functional groups of copolymerization, such as ethyl acetate and acrylic acid, ethyl acrylate, methyl acrylate and ethylene glycol.
Polyethylene is non-toxic, odourless, appearance white waxy solid.
Main properties are as follows: (1) the molecular structure of the linear or branched structures, simple in structure, neat, symmetry, good, easy to crystallization, material is soft and not easy embrittlement.
(2) inactive reactions in molecular groups and no impurity atoms, therefore, in excellent chemical stability, with hardly any physical reaction at room temperature.
Room temperature does not dissolve in any solvent a known, but the stability of hydrocarbons, oil is poorer, may cause swelling or discoloration.
In more than 70 t is soluble in xylene, four hydrogen naphthalene, ten hydrogen naphthalene such as solvent.
(3) polyethylene has excellent resistance to low temperature performance, and performance in low temperature changes.
(4) good resistance to wet, but has certain permeability.
(5) good heat sealing.
6. As there is no polarity polyethylene molecules, polarity of ink on the adhesion is bad, lead to optimum printing sex is bad, it should be done before the printing surface treatment.
Similarly, in front of the polyethylene film and other film for dry compound, also need to surface treatment, in order to increase printing or composite fastness.