UV-Curing Silicone-Based Adhesives with Improved Adhesion Strength and Aging Resistance

Abstract

Silicone adhesives play an important role in many fields, but they are still challenged by their weak adhesion strength and long curing time. Herein, an ultraviolet (UV)-curable, highadhesion-strength, aging-resistant silicone-based adhesive is realized by the synergy of a novel methacryloxy-functionalized silicone resin with 15 wt % acrylic acid (AA). This silicone-based adhesive can be UV-cured within 60 s, and the shear strength reaches 6.1 MPa, which is much higher than those of most commercially available silicone adhesives. Moreover, this adhesive has outstanding aging resistance; its adhesion strength still exceeds 4 MPa after being aged at 150 °C, immersed in water at 25 °C for 168 h, or treated under 85 °C and 85% relative humidity for 1000 h. The excellent adhesion and aging resistance mainly depend on the synergism of the polar carboxyl and methacryloxy groups and stable Si−O−Si skeletons. Therefore, this adhesive will be used in electronics, construction, optics, and other fields.