What is the EVA hot melt adhesive

EVA hot melt adhesive is a kind of do not need solvent, excluding water 100% of the solids can melt polymer; it solid at room temperature, melt to a certain temperature becomes able to flow, and there is some viscous liquid. EVA hot melt after melting, pale brown or white. EVA hot melt adhesive from the basic resins, tackifiers, viscosity modifiers and antioxidants and other ingredients.
A basic resin
The basic resin hot melt adhesive of ethylene and vinyl acetate copolymer formed under high temperature and pressure, that is, EVA resin. This resin is the main component of hot melt adhesive production, accounting for more than 50% of the number of ingredients. The proportion of the basic resin, the quality determines the basic performance of hot-sol, such as adhesive bonding capacity, melting temperature and its auxiliary choice. Therefore, binding
Used in EVA hot melt adhesive paper, should choose the appropriate ratio of ethylene and vinyl acetate, and has a certain softness, flexibility, adhesion, deformation of small species use.
2 tackifier
EVA hot melt adhesive tackifier is one of the main auxiliaries. If only * use the basic resin melt at a certain temperature with a cohesive force, when the temperature declines, it is difficult to wetting and penetration of paper, loss of bonding capacity, unable to meet bonding effect; adding tackifier can be to improve the mobility of colloids and wetting are sticky material, improve adhesive performance, to achieve the required bond strength.
3 viscosity-adjusting agent
Melt viscosity-adjusting agent is also one of the main auxiliaries. Its role is to increase the mobility of colloids, regulate solidification rate, in order to achieve the purpose of fast-bonded solid, or hot melt viscosity is too large or difficult to flow, it is difficult to infiltrate quote in the book to go, not able to leave their bond solid. Join softening point and low viscosity-adjusting agent, we can achieve a good penetration of bonding time, sticking too firmly purpose.
4 Antioxidant
Adding the right amount of antioxidants is to prevent premature aging of EVA hot-melt adhesives. Because the gel at higher temperatures will melt when the oxidation and decomposition by adding antioxidants can guarantee high temperature conditions, the bonding properties do not change.
In addition to the above but also according to the temperature outside of several raw materials, accompanied by regional differences in the cold with temperatures suitable for cold-agent or agents suitable for tropical temperatures of the heat.