Adhesive technology is a method of firmly connecting the same or different materials together by means of the adhesive force generated by the adhesive on the solid surface. There are two main forms of bonding: non-structural and structural.

Non-structural bonding mainly refers to surface adhesive coating, sealing and functional bonding. Typical non-structural adhesives include adhesives for surface bonding, sealing and conductive adhesives; while structural bonding is to firmly fix structural units with adhesives The phenomenon of bonding together. The structural adhesive and its bonding points used in it must be able to transmit structural stress, and it does not affect the structural integrity and applicability to the environment within the design scope.

　　Adhesive function

The main function of 　　 adhesive is to connect the materials to be bonded together. Compared with the traditional mechanical fastening, the stress transmission in the bonded component is more uniform in stress distribution, and the bonded component structure has higher strength and lower cost than mechanical fastening (riveting, welding, interference connection and bolt connection, etc.) ,light in mass. If the adhesive of the thin-walled part is bonded to the thick-walled product, the full strength of the thin-walled part can be fully exerted. The strength of the mechanical fastening and welding structure is limited by the fasteners or welding points and their heat-sensitive areas.

　　The components bonded with adhesive are smooth and smooth, and the functional characteristics are not reduced. This is particularly important for structural bonding. For example, the appearance of structural parts in the aerospace industry is smooth and smooth, which is conducive to reducing resistance and friction, and reducing friction heating to a minimum. Therefore, the rotor blades of the helicopter are all assembled with adhesive. The use of adhesives to bond closely matched electronic or electrical components also avoids bumps and benefits from it. Navigation appliances are assembled with adhesives to obtain a flat outer surface without structural interference. Because the stress distribution in the bonded joint is very uniform, the strength and rigidity of the bonded object can be fully reflected, and the quality can also be reduced. For example, the spacecraft is assembled with adhesive to eliminate the negative load, increase the payload, increase the voyage, and increase the freight rate. reduce.

　　 Adhesive can be used for bonding between various materials such as metal, plastic, rubber, ceramic, cork, glass, wood, paper, fiber and so on. When the joints of different materials are at variable temperature, the adhesive can exert its unique use efficiency. Flexible glue can adjust the difference in thermal expansion characteristics of the adherend and can prevent the rigid and rigid system from causing damage in the use environment. If the bonding component is used at a higher temperature, the flexible adhesive can be moved and migrated appropriately between different materials. Through the movement or migration process, the thermal expansion difference between different materials can be effectively adjusted to achieve the purpose of firmly bonding into one. Therefore, the bonding of windows, such as cars and airplanes, to the metal frame is usually done with adhesives.

　　 Sealing is actually a continuous bond. This bonding method is easy to seal the bonded joint. Prevent the penetration of liquids and gases that cause damage. Adhesives can also replace solid bodies or foam gaskets for sealing gearbox housings, valve covers, automotive parts and other industrial parts. Since the adhesive is mostly used in liquid state, it can also be used as potting compound, such as circuit board, motor, electrical and electronic components commonly used sealing potting compound.

　　Breaking or cracking of products or parts is a common phenomenon. The conventional repair method is welding. However, welding often causes thermal deformation stress on the repaired items, especially for thin-walled parts. This welding method is not suitable. If it is difficult to weld materials (such as Qin alloy) or in places prone to explosion (such as oil tanks, underground equipment, etc.), it is more difficult to repair by welding, and only safe and reliable adhesive bonding method can be used.

Casting defects (air holes, plugging holes) have always been a common problem in the casting industry. The common methods of repairing these defective parts require a lot of material and time for the skilled workers (Hi can only repair it, otherwise it will become a scrap. Use special filling glue to carry out Repairing is labor-saving and money-saving. The wear and tear of parts, oversize or scratches account for more than 70% of the failure rate of mechanical parts. The traditional method is to use surfacing, thermal spraying, electroplating, brushing, etc. Welding or thermal spraying Will cause the surface of the component to reach a very high temperature, causing the component to deform or form micro-cracks. It affects the dimensional accuracy and normal use of the component. Although electroplating and brush plating have no thermal effect, the thickness of the coating is strict and the application is limited However, the repair method using the adhesive surface coating technology is simple and easy, which has no heat effect and is not limited by the thickness of the coating, and can ensure the wear resistance of the parts.

　　 The phenomenon of "dripping, popping, seeping" is a situation that often occurs in the industrial sector, especially in the chemical industry.

It is very safe, convenient, time-saving, labor-saving and reliable to use the adhesive surface coating method to stop leaks. Sometimes, it does not affect the production, repair the leaked parts at normal pressure and normal temperature to achieve the purpose of resealing, especially petroleum, chemical, pharmaceutical, rubber , Food and other industries show their unique advantages in equipment maintenance in flammable and explosive occasions and non-stop leakage with pressure.