UV adhesive is to add photoinitiator (or photosensitizer) to the resin with special formula. After absorbing the high-intensity ultraviolet light in the ultraviolet (UV) curing equipment, it produces active free radicals or ionic radicals, thus initiating polymerization, cross-linking and grafting reactions, so that the resin (UV coating, ink, adhesive, etc.) can be transformed from liquid to solid in a few seconds (varying degrees) (this change process is called “UV curing”).
The application fields of adhesives are as follows:
Handicrafts, glass products
1. Glass products, glass furniture, electronic scale bonding
2. Crystal jewelry craft products, fixed inlay
3. Bonding of transparent plastic products, pmma/ps
4. Various touch film screens
Electronic and electrical industry
1. Painting and sealing of terminals / relays / capacitors and microswitches
2. Printed circuit board (PCB) bonding surface components
3. Integrated circuit block bonding on printed circuit board
4. Fixing of coil wire terminal and bonding of parts
Optical field
1. Optical fiber bonding, optical fiber coating protection
Digital disc manufacturing
1. In cd/cd-r/cd-rw manufacturing, it is mainly used for coating reflective film and protective film
2. D V D substrate bonding, the sealing cover for DVD packaging also uses UV curing adhesive
The purchasing skills of UV adhesive are as follows:
1. Selection principle of Ub adhesive
(1) Consider the type, nature, size and hardness of bonding materials;
(2) Consider the shape, structure and process conditions of bonding materials;
(3) Consider the load and form (tensile force, shear force, peeling force, etc.) borne by the bonding part;
(4) Consider the special requirements of the material, such as conductivity, heat resistance and low temperature resistance.
2. Bonding material properties
(1) Metal: the oxide film on the metal surface is easy to be bonded after surface treatment; Because the difference of the two-phase linear expansion coefficients of the adhesive bonded metal is too large, the adhesive layer is easy to produce internal stress; In addition, the metal bonding part is prone to electrochemical corrosion due to the action of water.
(2) Rubber: the greater the polarity of rubber, the better the bonding effect. NBR has high polarity and high bonding strength; Natural rubber, silicone rubber and isobutylene rubber have small polarity and weak adhesive force. In addition, there are often release agents or other free additives on the rubber surface, which hinder the bonding effect. Surfactant can be used as primer to enhance the adhesion.
(3) Wood: it is a porous material, which is easy to absorb moisture and cause dimensional changes, which may lead to stress concentration. Therefore, it is necessary to select an adhesive with fast curing. In addition, the bonding performance of polished materials is better than that of rough wood.
(4) Plastic: plastic with large polarity has good bonding performance.
Post time: Jun-07-2022