Polyethylene wax has good stability and better thermal stability when applied in hot melt adhesives. Therefore, it does not precipitate at high temperatures and will not have any impact on the external performance of the hot melt adhesive. The hot melt adhesive produced by adding polyethylene wax has good cold resistance, heat resistance, acid alkali salt medium corrosion resistance, thermal stability, anti slip, good fixation, high bonding strength, and excellent temperature resistance.

When used in packaging and non-woven applications, hot melt adhesive has many advantages: short solidification time, strong adhesion, and excellent moisture resistance, making it very suitable for sealing packaging and assembling disposable non-woven fabrics, such as diapers and women's hygiene products. In this fiercely competitive market, formula designers need to strike a balance between performance and cost, making the selection of ingredients particularly important. The largest component of hot melt adhesives is the base polymer, therefore, it contributes the most to cost and performance.

Basic polymers or "adhesives" typically account for 40-70% of hot melt adhesive formulations. Most hot melt adhesive formulations use ethylene vinyl acetate (EVA), block copolymers, or polyolefins (such as polyethylene and polypropylene) as the base polymers. When preparing a hot melt adhesive, a base polymer should be selected, which should have good adhesion to the substrate being bonded, low melt viscosity, good melt stability, and moisture resistance. These performance needs to be evaluated to ensure maximum performance and cost-effectiveness.

PE wax and EVA

Ethylene vinyl acetate is the most commonly used polymer in hot melt adhesive formulations for packaging and non-woven fabrics today. The hot melt adhesive formula based on polyethylene wax and EVA exhibits different results in terms of adhesive performance, viscosity, density, and melt stability depending on the formula and other components.

The relevant test results show that when used as a base polymer in hot melt adhesives, polyethylene polymers have similar properties to EVA. And it is superior to EVA in some aspects.

Viscosity

The hot melt adhesive based on polyethylene wax adhesive formula has lower melt viscosity compared to EVA based formulations. This makes it easier to apply to the substrate and allows for better and more thorough wetting of the surface.

Density

Polyethylene wax based hot melt adhesives have higher compatibility than EVA based adhesives and can be used for repulping processes. Adhesives with a density outside the range of 0.98 to 1.05 are easier to separate with centrifugal cleaning agents. This makes them more suitable for recyclable packaging.

Melting stability

Polyethylene polymers are much more stable in the molten phase than EVA polymers. This may be due to the simplicity of the polymer structure.

When used as a base polymer, polyethylene polymer can improve adhesion performance compared to EVA. In addition, PE wax can be added to EVA based hot melt adhesive formulations to improve melting stability, adhesion, and curing time. Usually, to produce continuous packaging of hot melt adhesive, the correct polyethylene polymer, tackifier resin, and antioxidant are required.

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