Polyethylene (PE) is a polymer, which is a synthetic plastic formed by the polymerization reaction of ethylene monomer. Here are some of the main chemical properties of polyethylene:
1.Chemical Formula: The basic chemical formula for polyethylene is (C2H4)N, where N denotes the number of repeating units.
2.Structure: Polyethylene is a linear polymer made up of repeating units of ethylene molecules. The structural formula of ethylene molecules is CH2=CH2, and they are linked by covalent bonds to form long chain polymers.
3.Melting Point: Polyethylene usually has a relatively low melting point, depending on its molecular weight. High-density polyethylene (HDPE) and low-density polyethylene (LDPE) have different physical properties, respectively, with HDPE usually having a higher melting point.
4.Density: The density of polyethylene also depends on its molecular weight. HDPE is generally denser than LDPE and therefore more rigid and rigid. PE is a low-density plastic that typically has a lower weight and good buoyancy, making it suitable for many packaging and floating applications.
5.Thermal stability: Polyethylene has good thermal stability within a certain range, but thermal degradation may occur at high temperatures.
6.Hydrophobicity: Polyethylene is a hydrophobic plastic that is resistant to water and many solvents.
7.Chemical stability: Polyethylene is relatively chemically inert and does not react easily to many chemicals and solvents. PE has good chemical stability and high resistance to most acids, bases and solvents.
8.Electrical insulation: Due to its molecular structure, polyethylene generally has good electrical insulation, so it is often used in electrical insulating materials and electronics.
9.Easeability: Polyethylene is a plastic that can be reused through proper disposal, helping to reduce the environmental burden.
10.Abrasion resistance: PE has good abrasion resistance and is able to resist friction and wear.
11.Low temperature resistance: PE has good low temperature resistance and can maintain flexibility at lower temperatures.
12.Ease of processing: PE is easy to process and mold, and can be processed into various shapes of products by blow molding, extrusion, injection molding, etc.
13.Food Safety: PE can be used in food packaging and food contact applications to meet food safety standards.
14.Transparency and lightfastness: PE generally has some transparency and is able to withstand some degree of UV exposure.
Polyethylene is a versatile plastic material, and its chemical properties make it have important uses in various fields, and are widely used in packaging materials, containers, pipes, wire insulation, building materials, medical devices, toys and other fields.
UV glue (ultraviolet curing glue) is usually a special type of glue whose curing process is done by ultraviolet irradiation rather than by chemical reactions. The suitability of UV glues depends on the material to be bonded.
Polyethylene is a plastic with low surface energy, which makes it difficult for its surface to form good bonds with other materials. UV glues typically require some activity on the surface of the material, and the low surface of polyethylene makes it difficult to provide adequate bonding points. In general, bonding polyethylene directly with UV glue may not be effective because the low surface energy of the polyethylene surface makes it difficult for the glue to adhere.
In order to improve the adhesion performance of UV glue to polyethylene, the following methods can be considered:
1.Surface treatment: Before using UV glue, you can try to treat the polyethylene surface, such as using plasma treatment, flare treatment, or chemical treatment, to increase the surface energy and improve the adhesion of the glue.
2.Use special glues: Some manufacturers offer UV glues that are specifically designed for use with low surface energy materials such as polyethylene. These glues may contain special adhesion enhancers to improve adhesion to polyethylene.
3.Mechanical structure: When bonding polyethylene, consider adding mechanical structure, such as using mechanical fixation or mortise and tenon construction, to reduce the dependence on glue.
It should be noted that the surface treatment of polyethylene PE will greatly improve the bonding effect of UV glue on polyethylene.