Pressure sensitive adhesive for protective film and preparation method thereof

Abstract

The invention discloses a pressure sensitive adhesive for a protective film and a preparation method thereof. The pressure sensitive adhesive is formed by polymerizing acrylic monomers through radicals, wherein the acrylic monomers comprise the following components in percent by weight: 30-50 percent of acrylic soft monomer, 5-20 percent of acrylic hard monomer, 0.5-2.5 percent of acrylic functional monomer, 0.5-2.5 percent of acrylic crosslinking monomer, 40-60 percent of solvent, 0.2-2.0 percent of initiating agent and 0.01-0.2 percent of chain transfer agent. The adhesive has higher initial adhesion and permanent adhesion and excellent weather-proof and aging-resisting performances and can meet the requirement of a protective film adhesive with higher strength requirement.

Description

Technical field [0001] The invention belongs to the field of synthesis of polymer adhesives, more precisely, it belongs to the radical polymerization of solvent acrylates. Background technique [0002] Conventional pressure-sensitive adhesives for protective films can meet the requirements by using water-based pressure-sensitive adhesives, and are safe and environmentally friendly. However, for some areas where the requirements of protective films are almost strict, such as the composite of glass and polyester film on refrigerator doors, decorative materials The composite of medium glass and polyvinyl chloride (PVC), etc., these applications require not only good initial adhesion of the pressure-sensitive adhesive, but also high holding force, that is, the cohesive energy of the glue system should be high enough. High composite strength is required when they are together, and there is no residual glue on the substrate after peeling off, so the emulsion type protective film that r...

AI Technical Summary

Problems solved by technology

[0002] Conventional pressure-sensitive adhesives for protective films can meet the requirements by using water-based pressure-sensitive adhesives, which are safe and environmentally friendly. Compounding of medium glass and polyvinyl chloride (PVC), etc. These applications not only require good initial adhesion of the pressure-sensitive adhesive, but also require high holding force, that is, the cohesive energy of the glue system must be high enough, and the compounding When they are together, the composite strength is required to be high, and there is no residual glue on the substrate after peeling off, so the emulsion-type protective film that relies on particles to form a film cannot meet this requirement.

[0003] Conventional acrylic series solvent-based adhesives cannot meet the requirements of the above-mentioned specific application fields in terms of their overall performance. For example, some two-component adhesives rely on the addition of curing agents to improve the cohesive strength of the system, but it will lead to the failure of the system. The initial tack is extremely low, which cannot satisfy fast bonding and reduces production efficiency

Some one-component pressure-sensitive adhesives rely on the reduction of molecular weight to improve the initial adhesion of the system, but after peeling off, there will be a large amount of residual glue on the substrate, which will seriously affect the appearance of the product.