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Hot melt adhesive type

2020-10-22 15:39:12
Hot melt adhesive type

Hot melt adhesive is a kind of plastic adhesive. Its physical state changes with temperature change within a certain temperature range. The electric hot melt sleeve has the same chemical characteristics. It is non-toxic and tasteless, and is an environmentally friendly chemical product. Electric fuse sleeves are favored because of their solid products, which are convenient for packaging, transportation, storage, solvent-free, non-polluting, non-toxic, and simple production process, high value-added, high bonding strength, and fast speed. The basic resin of the glue is the copolymerization of ethylene and vinyl acetate under high temperature and high pressure, namely EVA resin. This kind of resin is the main component of making hot melt adhesive. The ratio and quality of the basic resin determine the basic properties of the hot melt adhesive. (such as adhesive bonding ability, melting temperature and bonding strength) generally choose VA content of 18-33, Melt index (MI) 6-800, VA content is low, the higher the crystallinity, the higher the hardness, under the same circumstances, the VA content is large, the crystallinity is low, the elasticity increases, the choice of EVA melt index is also very important, the smaller the melt index, the poorer the fluidity High strength, high melting temperature, poor wettability and permeability to adherends. On the contrary, if the melting finger is too large, the melting temperature of the glue is low, and the fluidity is better but the bonding strength is reduced. The choice of its additives should choose the appropriate ratio of ethylene and vinyl acetate.





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