EVA hot melt adhesive is a solid fusible polymer that does not require solvent and contains 100% moisture; it is solid at normal temperature, and is heated and melted to a certain temperature to become a liquid with a certain viscosity. The molten EVA hot melt adhesive is light brown or white. EVA hot melt adhesive consists of basic resin, tackifier, viscosity modifier and antioxidant.
Basic resin
The basic resin of EVA hot melt adhesive is ethylene and vinyl acetate copolymerized under high temperature and high pressure, namely EVA resin. This resin is the main component of the hot melt adhesive, accounting for more than 50% of its ingredients. The proportion and quality of the basic resin determine the basic properties of the hot melt, such as the bonding ability of the glue, the melting temperature and the choice of additives. Therefore, the EVA hot melt adhesive for binding paper used for binding should be selected from a variety of products having appropriate flexibility, elasticity, adhesion and deformation.
Tackifier
Tackifiers are one of the main additives for EVA hot melt adhesives. When the resin melts, it has a bonding force at a certain temperature. When the temperature is lowered, it is difficult to wet and penetrate the paper, and the bonding ability is lost, and the bonding effect cannot be achieved. The addition of the tackifier can improve the fluidity of the colloid. And the wettability to the adherend, improve the bonding performance, and achieve the desired bond strength.
Viscosity modifier
Viscosity modifiers are also one of the main additives for hot melt adhesives. Its function is to increase the fluidity of the colloid and adjust the solidification speed to achieve the purpose of fast bonding. Otherwise, the viscosity of the hot melt adhesive is too large, unable or difficult to flow, and it is difficult to penetrate into the signature, and it cannot be bonded. firm. By adding a viscosity modifier having a low softening point, it is possible to achieve good penetration and adhesion when bonding.
Antioxidant
An appropriate amount of antioxidant is added to prevent premature aging of the EVA hot melt adhesive. Because the colloid is oxidatively decomposed at a high temperature during melting, the addition of an antioxidant ensures that the bonding properties do not change under high temperature conditions.
In addition to the above-mentioned raw materials, it is also possible to match some cold-resistant refrigerants suitable for cold-band temperature or heat-resistant agents suitable for tropical temperatures depending on the temperature and regional differences.
EVA hot melt adhesive is a solid fusible polymer that does not require solvent and contains 100% moisture; it is solid at normal temperature, and is heated and melted to a certain temperature to become a liquid with a certain viscosity. The molten EVA hot melt adhesive is light brown or white. EVA hot melt adhesive consists of basic resin, tackifier, viscosity modifier and antioxidant.
Basic resin
The basic resin of EVA hot melt adhesive is ethylene and vinyl acetate copolymerized under high temperature and high pressure, namely EVA resin. This resin is the main component of the hot melt adhesive, accounting for more than 50% of its ingredients. The proportion and quality of the basic resin determine the basic properties of the hot melt, such as the bonding ability of the glue, the melting temperature and the choice of additives. Therefore, the EVA hot melt adhesive for binding paper used for binding should be selected from a variety of products having appropriate flexibility, elasticity, adhesion and deformation.
Tackifier
Tackifiers are one of the main additives for EVA hot melt adhesives. When the resin melts, it has a bonding force at a certain temperature. When the temperature is lowered, it is difficult to wet and penetrate the paper, and the bonding ability is lost, and the bonding effect cannot be achieved. The addition of the tackifier can improve the fluidity of the colloid. And the wettability to the adherend, improve the bonding performance, and achieve the desired bond strength.
Viscosity modifier
Viscosity modifiers are also one of the main additives for hot melt adhesives. Its function is to increase the fluidity of the colloid and adjust the solidification speed to achieve the purpose of fast bonding. Otherwise, the viscosity of the hot melt adhesive is too large, unable or difficult to flow, and it is difficult to penetrate into the signature, and it cannot be bonded. firm. By adding a viscosity modifier having a low softening point, it is possible to achieve good penetration and adhesion when bonding.
Antioxidant
An appropriate amount of antioxidant is added to prevent premature aging of the EVA hot melt adhesive. Because the colloid is oxidatively decomposed at a high temperature during melting, the addition of an antioxidant ensures that the bonding properties do not change under high temperature conditions.
In addition to the above-mentioned raw materials, it is also possible to match some cold-resistant refrigerants suitable for cold-band temperature or heat-resistant agents suitable for tropical temperatures depending on the temperature and regional differences.
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