What is solvent-based pressure-sensitive adhesive?

I. Core Characteristics

Pressure-Sensitive Adhesion: No heating, solvents, or additional methods are required; only light finger pressure is needed for rapid bonding to the substrate. No residue is left after peeling, and it can be reused repeatedly.

Fast Drying Speed: A tacky layer forms rapidly after solvent evaporation, suitable for high-speed production lines.

Strong Coating Adaptability: Strong adhesion to substrates such as plastic films, metal foils, and paper; excellent leveling and transparency.

Adjustable Performance: Parameters such as initial tack, peel strength, and heat resistance can be customized by adjusting the monomer ratio, crosslinking agent type, and added additives.

II. Composition and Preparation

Main Components:

Acrylic Ester Monomers: Soft monomers such as 2-ethylhexyl acrylate (2-EHA) and butyl acrylate (BA) (comprising over 70%), providing flexibility and adhesion; hard monomers such as methyl methacrylate (MMA), enhancing cohesive strength.

Crosslinking Agents: Such as isocyanates and polyurethane resins, improving cohesiveness and aging resistance.

Additives: Tackifying resins (rosin, terpene resins), metal chelates (to improve heat resistance), surfactants, etc.

Solvents: Ethyl acetate, toluene, xylene, etc., to dissolve the polymer and adjust viscosity.

Preparation Process: A copolymer is generated through free radical polymerization in an organic solvent, then additives are added and mixed evenly to form a viscous liquid.

III. Typical Application Scenarios

Electronics Industry: Manufacturing shielding tapes, insulating tapes, and protective films for fixing and protecting circuit boards and electronic components.

Packaging Industry: Producing high-strength labels and double-sided tapes to meet the packaging needs of food and daily chemical products.

Automotive Manufacturing: Bonding interior parts and sealing strips, providing weather resistance and vibration resistance.

Optoelectronics Industry: Used for bonding optical films and polarizers, requiring high transparency and low residue.

Special Environments: After cross-linking modification, it can be used in extremely cold or high-temperature conditions (e.g., 180℃).

KL-9301 Protective Film Primer, a special primer for optical-grade PET protective film coating.

Features low tack, 1-2g peel strength. Ultra-fast automatic air release in 0.15 seconds. Primer-free, with excellent spreadability before curing.

High transparency, light transmittance exceeding 94%. Passes double 85 testing, leaves no residue under high temperature and humidity.

Applications: Protective films for electronic products, automobiles, construction, and glass surfaces. Typical applications of this protective film primer include aftermarket screen protectors, mobile phone protectors, process films, and other PET silicone protective film products.