Water-based multi-time movable pressure sensitive adhesive containing microcapsules

Pressure sensitive adhesive is a kind of adhesive which is sensitive to pressure. The pressure sensitive adhesive can form a relatively strong bonding force under a small force. The bonding force formed between the two surfaces is mainly van der Waals force and other polar forces.

Therefore, after the formation of the adhesive surface, the structure of the adhesive surface is mostly not destroyed, and its adhesion can be maintained for a relatively long time. Pressure sensitive adhesive products on the market are mainly divided into solvent – based and water-based two categories.

Solvent-based pressure sensitive adhesive still contains organic solvents (VOC) such as toluene, xylene and ethyl acetate after being prepared into terminal products, so it should not be used indoors or in places without ventilation. Water-based pressure sensitive adhesive is made of water as a solvent, without VOC and other harmful substances after the final product, can be used in a variety of occasions with special requirements for health and environmental protection.

Pressure sensitive adhesive can be divided into permanent adhesive, removable adhesive and multiple removable adhesive from the use of function. Permanent glue will be left on the paste surface after use, cleaning time-consuming and laborious, easy to destroy the original interface, so it can only be used once, containing solvent pressure sensitive glue will cause secondary pollution; Solvent-based or a few water-based removable adhesives are mostly two-component acrylic pressure sensitive adhesives, often limited to a specific interface or substrate, so its use is small, affecting the wide range of product popularity.

There are a few domestic acrylic water-based movable adhesive products, but there are generally poor glue cohesion, paste surface residual glue, poor stability, not compatible with a variety of substrates and different interfaces, and difficult to achieve multiple removable problems. A water-based multiple moveable pressure sensitive adhesive containing microcapsules and a preparation method thereof are required. By introducing the polymer with microcapsule structure and the multi-component star polymer, a water-based, environment-friendly, multiple removable, adhesive surface without residue, good cohesion, strong versatility of water-based multiple removable pressure sensitive adhesive was obtained.