Why research UV-curable pressure-sensitive adhesive

Ultraviolet curing technology is a technology that uses a photoinitiator to initiate polymerization, grafting, crosslinking, and other chemical reactions of monomers under ultraviolet irradiation to achieve rapid curing. Uv curable pressure-sensitive adhesive prepared by UV curable technology is a new type of energy-saving and environment-friendly pressure-sensitive adhesive.

Under UV irradiation, after grafting and cross-linking curing, the required pressure-sensitive adhesive is produced. It has the advantages of a fast curing rate, fast curing at room temperature, no heating, no organic solvent, less pollution, and adjustable performance.

Uv-curable pressure-sensitive adhesive is mainly based on free radical photocuring, the reaction speed is fast, and the curing process is mature, but the free radical curing system has oxygen-blocking polymerization, a thick layer, and color system is difficult to cure, after curing volume shrinkage rate is large, because UV-curable pressure-sensitive adhesive is mainly used in two bonded interfaces, the shrinkage stress and curing film shrinkage generated during the curing process, it will directly lead to the decrease of adhesion, which will affect the bond strength of UV-curable pressure-sensitive adhesive on the substrate. In order to reduce the shrinkage rate of the curable film, improve the adhesion of the adhesive, and ensure that the UV-curable pressure-sensitive adhesive has the properties of waterproof, weather resistance, and environmental protection, it is necessary to study a UV-curable pressure-sensitive adhesive and its preparation method.

Based on modified polysiloxane, choose hydrogen polysiloxane, its Si -O -Si key is longer, is not soft, and often can delay the shrinkage of the cured film, and the antioxidant polymerization effect is strong, and high efficiency for hydrogen, due to the Si- H key is of high activity, according to the silicon hydrogen addition reaction, Join methyl acrylic acid allyl ester was certain chain length and carbon-carbon double bond polysiloxane macromolecules, by adding vinyl silane coupling agent which in polysiloxane macromolecules  Si (OR) is introduced in three groups, the bonding interface formed strong high chemical bonds, improve the adhesive and stick on the surface of the junction adhesion, greatly improve the bonding strength. And controlling the vinyl silane coupling agent and methyl acrylic acid allyl ester of dosage makes the left part of the hydrogen polysiloxane not involved in the silicon hydrogen addition reaction of the Si-H bond, Si-H key has strong reducibility, and can effectively reduce the curing process of the polymerization.

Through the acrylic monomer, modified polysiloxane and epoxy acrylate resin mixed crosslinking, cyclooxy acrylate resin can reduce the volume shrinkage rate of curing process, and has good heat resistance, chemical resistance and high adhesion, so as to prepare the environmental protection UV curable pressure sensitive adhesive with high water resistance, high adhesion, high weather resistance.