Develop a new type of pressure sensitive adhesive which can be used in high and low temperature environment

It is very important to develop a new type of pressure-sensitive adhesive which can be used in a high and low-temperature environment.

Adhesives are widely used in People’s Daily life, providing a variety of conveniences for people’s life. Pressure Sensitive Adhesive (PSA) is a very important adhesive. Psa is very sensitive to pressure and can be strongly bonded to the adhesive by applying mild pressure without the need for solvent, heat, or other means. Since the last century, the research and application of pressure-sensitive adhesive have been rapidly developed and has been widely used in all walks of life. Acrylate pressure-sensitive adhesive is the most widely used pressure-sensitive adhesive in the market at present.

It is the copolymer of acrylate monomers and other vinyl monomers, with good bonding strength, aging resistance, weather resistance, good transparency, medium resistance, no phase separation and migration, and other excellent properties. The bonding mechanism of pressure-sensitive adhesive is as follows: it will have viscous flow after being subjected to external pressure and can fully contact with the substrate surface.

When the pressure-sensitive adhesive has sufficient wettability to the substrate surface, the molecules between the interface can contact closely and generate intermolecular force to achieve adsorption equilibrium and generate strong adhesion. Therefore, the pressure-sensitive adhesive must have good viscoelasticity and good wettability to the substrate in order to produce sufficient adhesion. However, at low temperatures, when the temperature is close to or lower than the glass transition temperature (Tg) of the pressure-sensitive adhesive, the molecular chain segment movement of the polymer in the pressure-sensitive adhesive is limited, and the pressure-sensitive adhesive cannot fully contact with the substrate, resulting in bonding failure.

At high temperatures, the solvent in the pressure-sensitive adhesive may volatilize, resulting in the failure of the pressure-sensitive adhesive; At the same time, at high temperatures, the molecular chain of the pressure-sensitive adhesive becomes soft, unable to provide enough cohesion, resulting in the decline of bonding performance. In recent years, the research of high-temperature or low-temperature resistant pressure-sensitive adhesives has made some progress, but these preparation methods are usually more complex, and can not take into account the high and low-temperature resistance. Therefore, it is very important to develop a new type of pressure-sensitive adhesive which can be used in high and low-temperature environments.