Influence of VA content of EVA hot-melt adhesive on performance and application

EVA (also known as E/VAC or E/VAC), scientific name: ethylene-vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer) is obtained by copolymerizing ethylene (E) and vinyl acetate (VA).

The hot melt adhesive with EVA resin as the main component, because it does not contain solvent, does not pollute the environment and has high safety, is very suitable for automatic assembly line production, so it is widely used in: book binding, furniture edge banding, automobile and household Assembly of electrical appliances, shoe-making, carpet coating and metal anti-corrosion coating, ink, luggage, bottle pads, etc., so my country's annual market consumption is constantly increasing.

So how to formulate EVA hot melt adhesives suitable for all walks of life? The first condition is to look at the VA content.

The general vinyl acetate VA content is about 5%-40%. EVA has good elasticity and flexibility, good low temperature impact resistance, and can be used in cold and low temperature minus 20-40 degrees; good heat sealing performance and low melting point .

The density of EVA is also determined by the level of VA content. The higher the VA content, the closer the resin is to rubber, so its hardness will be lower than that of the same product. In addition, the difference in VA content also determines what product it should do. If the VA content is below 5%, it can be used as a cable. So in general, when the VA content is in the range of 10%~20%, it is a plastic material, and when the VA content exceeds 30%, it is an elastic material.