Using hot melt adhesive sticks in low temperature environments

The hot melt stick will be destroyed at low temperature, the interface will be destroyed, the sticky layer will be destroyed, and the mixing will be destroyed. So, at low temperature, can the hot melt glue stick work normally?

Interfacial damage refers to insufficient adhesion between the pressure-sensitive adhesive and the surface of the adhesive. The failure of the adhesive layer is due to the low cohesion of the pressure sensitive adhesive. When force is applied, the adhesive layer itself destroys localized adhesive residues on the adhesive surface.

Generally, as the temperature decreases, the evolution law of PSA failure is from the failure of the bonding layer to the failure of the mixed layer, and finally the interface failure.

 

The main reasons are as follows

 

1: At low temperature, the molecular movement speed of the pressure-sensitive adhesive is slow, and it is difficult to penetrate quickly. Meanwhile, when the modulus of the pressure-sensitive adhesive increases under the same pressure, the deformation of the adhesive is smaller, the effective contact area is smaller than that at room temperature, and the adhesive strength is lower.

 

2: As a polymer product, pressure-sensitive adhesive requires sufficient time for its molecular movement. Ordinary needs to be kept at the proper temperature for 72 hours. The bonding strength of the pressure-sensitive adhesive and the bonding surface can reach the ideal bonding strength. Temperature is also an important factor in this process. Molecular motion slows down at low temperatures to build strength. The demand time also increases accordingly.

 

The ambient temperature of many pressure sensitive adhesives is well below the normal operating temperature of the pressure sensitive adhesive. This is the main reason for the failure of a large number of pressure sensitive adhesives in winter. For pressure sensitive adhesives for winter use, choose a low temperature adhesive for winter bonding production. The glue still retains the ability to move molecules at lower temperatures to ensure low temperature performance.