Determination of the quality of pressure-sensitive adhesive

How to judge the quality of waterborne pressure sensitive adhesive？

Pressure-sensitive adhesive quality of good or bad, generally from the drying speed, viscosity, adhesive strength, solid content and PH value and other aspects to measure.

1, pressure-sensitive adhesive drying speed

When buying pressure-sensitive adhesive, it is necessary to measure whether the drying speed matches the bonding process. The general manual bonding process is slow, requires a long initial dry time; Machine bonding process is very fast, requiring short initial drying time. For the initial dry time, the vast majority of cases require the sooner the better, so as soon as possible into the next road process.

2, the viscosity of pressure-sensitive adhesive

Viscosity is the most important factor affecting the quality of adhesives. If the viscosity is too large, the coating is thick, consumption of plastic large, slow drying, but also affect the adhesive on the surface of the sticky material wetting and infiltration, and thus directly affect the adhesive strength; if the viscosity is too small, The coating is thin, too fast drying, prone to poor adhesion and other issues.

3, the adhesive strength of pressure-sensitive adhesive

Pressure-sensitive adhesive must have sufficient adhesive strength to ensure the normal use of the object after bonding. You can ripped two sticky materials along the adhesive interface, to determine whether the adhesive strength is qualified. If it is found that the material is damaged after tearing, it is proved that the adhesive strength is sufficient. If only the adhesive interface is separated, it indicates that the strength is insufficient.

4, the pressure-sensitive adhesive solid content

Solid content is also one of the important factors affecting the quality of pressure-sensitive adhesive. If the pressure-sensitive adhesive content is higher, then it has less water, the stronger the adhesion, the faster the drying speed. General pressure-sensitive adhesive content of 55% ± 1.

5. The pH of the pressure sensitive adhesive
Synthetic resin adhesive mostly weak acid, the bonding process will not have a negative impact. But the water glass and starch adhesives alkaline high alkaline high will not only on the operating personnel and equipment corrosion, and sometimes corrosion of sticky objects, the formation of the appearance of the mark. Therefore,  the purchase of adhesives to consider the impact of pH on the product.