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Hot melt adhesive related knowledge
Jan 13, 2018

Hot glue (English name: Hot Glue) is a plastic adhesive, in a certain temperature range of its physical state changes with temperature change, and the same chemical properties, its non-toxic and tasteless, is an environmentally friendly chemical products. Because of its solid product itself, easy packaging, transportation, storage, solvent-free, non-polluting, non-toxic; and the production process is simple, high value-added, bonding strength,

EVA hot melt adhesive is a solvent-free, non-water-soluble 100% solid meltable polymer; it is solid at room temperature, heated to melt to a certain temperature becomes a flow, and a certain viscosity of the liquid. EVA hot melt after melting, was light brown or white. EVA hot-melt adhesives from the basic resin, tackifier, viscosity modifier and antioxidant composition.

Hot melt adhesive is the basic resin of ethylene and vinyl acetate at high temperature and pressure copolymerization, that EVA resin. This resin is the main component of the production of hot-melt adhesives, the basic resin ratio, the quality determines the basic properties of hot-melt adhesives (such as the adhesive strength of the adhesive, melting temperature and bond strength) The general choice of VA content 18-33, Melt index (MI) 6-800, VA content is low, the higher the degree of crystallinity hardness increases, under the same VA content, low crystallinity elasticity increases, the choice of EVA melt index is also important, the smaller the melt index mobility High strength and high melting temperature of the adherend wetting and permeability are also poor. On the contrary, the melt index is too large, the melting temperature of the adhesive is low, the fluidity is good, but the bond strength is reduced. The choice of additives, should choose the appropriate proportion of ethylene and vinyl acetate.

Tackifier EVA hot melt adhesive is one of the main additives. If only * with the basic resin melting at a certain temperature has the adhesive force, when the temperature drops, it is difficult to wet and penetrate the paper, loss of bond 

capacity, can not achieve the bonding effect; can be added tackifier Improve the fluidity of colloids and the wettability of the adherend to improve the bonding performance, to achieve the required bond strength. General tackifier rosin, modified rosin (138 or 145), C5 petroleum resin, C9 petroleum resin, terpene resin.

Viscosity modifiers are also one of the major auxiliaries for hot melt adhesives. Its role is to increase the fluidity of colloids, adjusting the rate of solidification, in order to achieve the purpose of fast bonding firm, or hot melt viscosity is too large, can not or difficult to flow, it is difficult to infiltrate the signposts, you can not bond firm. Addition of low softening point viscosity regulator, you can achieve good penetration when bonding, the purpose of sticking firmly. The general choice of paraffin, microcrystalline wax. Synthetic wax (PE or PP), wax Buddha and so on.

The right amount of antioxidant is added to prevent premature aging of the EVA hot melt adhesive. Because the colloid melting at high temperatures will be oxidative decomposition, adding antioxidants can ensure that under high temperature conditions, the bonding performance does not change.

In addition to the above several raw materials can also be based on temperature, regional differences coupled with some suitable for cold temperature cold agent or suitable for tropical temperatures of the heat agent.


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