Influencing factors of curing speed of EVA hot melt adhesive
The curing speed of EVA hot melt adhesive refers to the time from the beginning of sizing and pressing to 80% bond strength. The curing time required for general use ranges from 1 second to 10 seconds, and the curing speed required for automatic wire sealing is generally within 4 seconds. There are several factors that affect the curing speed of EVA hot melt adhesives.
First, the type of EVA has little effect on the curing speed, but the trend is that the curing speed corresponding to EVA with low melt index and low VA content will be faster.
The second is the effect of tackifiers. Choosing a tackifier with a high softening point and increasing the amount of tackifier will help to improve the curing speed. The use of tackifier has a great influence on the curing speed.
Finally, waxes have an effect on cure speed. Waxes generally play a role in viscosity adjustment and partial plasticization in hot melt adhesive systems. Waxes have the greatest effect on cure speed.
The general rule is that the higher the softening point of the wax, the faster the curing speed. The more wax you use, the faster the cure. However, the wax has a great adverse effect on the bonding strength, so the adjustment of the curing speed is limited to relying solely on the wax.
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