(1) Metal: After the surface treatment of the oxide fil […]
(1) Metal: After the surface treatment of the oxide film on the metal surface, it is easy to bond; because the two-phase linear expansion coefficient of the adhesive bonding metal is too different, the adhesive layer is easy to generate internal stress; Produces electrochemical corrosion.
(2) Rubber: The greater the polarity of the rubber, the better the bonding effect. Among them, nitrile butadiene rubber has high polarity and strong bonding strength; natural rubber, silicone rubber and butyl rubber have low polarity and weak adhesion. In addition, the rubber surface often has a release agent or other free auxiliaries, which hinders the bonding effect.
(3) Wood: It is a porous material, which is easy to absorb moisture, causing dimensional changes, which may result in stress concentration. In addition, the polished material has better bonding properties than the rough surface wood.
(4) Plastic: Plastics with high polarity have good bonding performance.
(5) Glass: The surface of the glass is composed of a number of uniform uneven portions from a microscopic angle. The use of a good wettability agent prevents the presence of bubbles in the unevenness. In addition, the glass is based on si-o- The surface layer is easy to adsorb water. Because of the strong polarity of the glass, the polar adhesive is easy to hydrogen bond with the surface to form a strong bond. The glass is brittle and transparent, and these should be considered when selecting the adhesive.