What should you pay attention to when using a water-based adhesive compound film?

Public date： 2018-3-22 10:25:40

Composite film composites If you use water-based adhesives to achieve the best composite effect, how does the maturation process after compounding make peel strength better? The following content will be explained one by one!
1, can it be diluted with water?
At present, the market's water-based adhesives are mostly emulsion-based. The principle is that high-molecular polymers rely on emulsifiers to stably exist in water. It is actually a metastable state, and many external forces can cause the gelled liquid to break down and lose. effect.
Therefore, it is not recommended to dilute the glue with water. Dilution with water increases the surface tension of the glue, destroys the stability of the glue and leads to delamination. In addition, dilution can alter the surface properties of the product, resulting in poor wetting and affecting the composite appearance.
2. Is it necessary to cure the water-based adhesive film?
Water-based adhesive composites generally do not require curing and can be slit at the next machine. Appropriate curing for a period of time can increase the peel strength because the molecular weight of the water-based glue is high and it takes a certain time to level and reach a better strength.
Therefore, it is better that the composite film is matured in a maturation chamber at 50° C. for 1 h to 4 h when conditions permit. Prolonged high temperature (above 80°C) aging has a certain effect on the strength of the composite film because the water-based adhesive polymer cannot withstand high temperatures for a long time.