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When used in packaging and non-woven applications, hot melt adhesives have many advantages: their short setting time, strong adhesion and excellent moisture resistance make them ideal for sealing packaging and assembling disposable non-woven fabrics, such as diapers and feminine hygiene products. In this highly competitive market, the choice of ingredients is particularly important as formula designers have to strike a balance between performance and cost. The largest component of a hot-melt adhesive is the base polymer, so it contributes the most to cost and performance.
The base polymer or “Binder”usually accounts for 40-70% of the hot-melt binder formulation. Most hot-melt adhesive formulations use ethylene vinyl acetate (Eva) , block copolymers or polyolefins (such as polyethylene and polypropylene) as the base polymer. When preparing a hot-melt adhesive, a base polymer should be selected. The polymer should have good adhesion to the substrate to be bonded, low melt viscosity, good melt stability and moisture resistance. These capabilities need to be evaluated to ensure maximum performance and cost-effectiveness.
Qingdao Sainuo PE wax has low thermal weight loss, low oil content and high hardness. it widely used in hot melt adhesive, white masterbatch, fillier masterbatch, low consistency color masterbatch.
PE wax and EVA
Vinyl acetate is the most commonly used polymer in hot melt adhesive formulations for packaging and nonwovens today. The hot melt adhesive based on polyethylene wax and EVA shows different results in adhesive properties, viscosity, density and melt stability according to the different formulations and other components.
The results show that the properties of polyethylene are similar to Eva when it is used as the base polymer in hot melt adhesive. And in some ways better than Eva.
The hot melt adhesive based on polyethylene wax has lower melt viscosity than that based on Eva. This makes it easier to apply to the substrate and to wet the surface better and more thoroughly.
Hot melt adhesives based on polyethylene wax have higher compatibility than those based on Eva and can be used in repulping process. Adhesives with densities between 0.98 and 1.05 are easier to separate with centrifugal cleaners. This makes them more suitable for recyclable packaging.
(3) Melt stability
Polyethylene polymers are much more stable in the melt phase than EVA polymers. This may be due to the simplicity of the polymer’s structure. When used as a base polymer, polyethylene polymers improve adhesion compared with Eva. In addition, PE wax can be added to the hot melt adhesive formula based on Eva to improve the melt stability, adhesion and curing time. In general, the correct polyethylene polymers, tackifiers and antioxidants are all that is needed to produce a continuous package of hot melt adhesives.
Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer for PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS, Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing.
Sainuo rest assured wax, welcome your inquiry!
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