Why research on low surface hydrophobic acrylic pressure sensitive adhesive?

With the development of industrial science and technology, the need to paste the substrate from traditional wood, paint, metal, and other materials, gradually developed into the plastic substrate, plastic substrate compared with metal, wood, and other materials easy to process, but the surface energy is low, difficult to bond. The existing use of rubber series adhesives to paste low surface energy materials, rubber adhesives often have enough bonding force for low surface energy adhesives, but its own aging resistance and poor low-temperature resistance, another kind of silicone adhesive, its comprehensive performance is excellent, but the cost is high, limits its range of use.

The water-based acrylic pressure-sensitive adhesive emulsion is a protective film, tape, and label commonly used adhesive, with low cost, aging resistance, weather resistance, and good adhesion performance, metal, paper, glass, fabric, and other materials with high surface energy have excellent bonding performance. However, the bonding property of low surface energy materials such as PP, PE, fluorine plastics, EPDM, and fluorocarbon coating is not good, which is easy to appear in the process of use, such as loss of viscosity and fall off, causing certain hidden dangers to the use of downstream products.

At present, the acrylate pressure-sensitive adhesives with excellent adhesion performance on low surfaces are mostly composed of soft monomers with low glass transition temperature, but there are obvious defects, such as easy to become soft at high temperatures and loss of practical application effect. In addition, reactive emulsifiers or small-molecule emulsifiers are added to acrylate pressure-sensitive adhesives to improve the adhesion of surface materials. However, residual-free emulsifiers migrate to the surface of the film. After film formation, emulsifiers with high surface tension are distributed on the surface of the pressure-sensitive adhesives, making it difficult to obtain pressure-sensitive adhesives with low surface tension.

The technical problem to be solved is that the current acrylic pressure-sensitive adhesive has poor bonding properties of low surface energy materials.