Not any substance can be used as an adhesive. The adhesive must meet the following requirements: 1. No matter what form it is, it should be in liquid state when coating. 2. Ensure that the surface of the adherend can be fully wetted. 3. It must be able to transform from liquid to solid to form a tough adhesive layer. 4. It has a certain strength after curing and can transmit stress and resist damage. 5. Be able to withstand the test of time.
Adhesives can directly bond several materials together firmly. With the development of the synthetic chemical industry, there are many types. According to the chemical composition, they can be divided into the following types: 1. Acrylic adhesive, multiple curing methods, multiple parts bonding, faster positioning and curing, and more excellent bonding strength. 2. Polyurethane adhesive has strong adhesion on a variety of surfaces, making the bonding of the same or different materials stronger and more reliable. Cham polyurethane series adhesives have adjustable adhesion and toughness, and have excellent bonding strength, temperature resistance, chemical corrosion resistance and aging resistance. Covering hot melt adhesives, reactive structural adhesives, solvent-based conformal adhesives and other product types. It has excellent adhesive properties on metal, rubber, glass, ceramics, plastics, wood, fabric, leather and other materials. 3. Epoxy adhesives are particularly excellent in bonding strength and mechanical strength. Their temperature resistance and chemical resistance are also unconventional, and their applicability to base materials is equally wide. Depending on the product type, different products can be cured at room temperature or quickly cured by heating. After curing, they have extremely high bonding strength, mechanical strength, and excellent temperature resistance and chemical resistance. It can be used for bonding and fixing, sealing protection, device protection, etc. of electronic product parts and structural parts. 4. Silicone adhesive has good sealing and bonding properties and broad weather resistance. It can handle low temperatures to -60°C and high temperatures to 200°C. Depending on the product type, they have core properties such as excellent temperature resistance and insulation, as well as good sealing and bonding properties. It is widely used for fixed reinforcement, cavity sealing, waterproof protection, etc. of electronic components. It is also suitable for sealing, filling, bonding, and packaging in high-temperature applications, such as high-temperature kitchen appliances, thermoelectrics, and air purifiers. Adhesives can be used in all aspects of daily life and production. For example, epoxy structural adhesive can be used for bonding and fixing electronic product parts and fasteners, RTV silicone can be used for fixing and reinforcing electronic components, and PUR hot melt adhesive can be used for mobile phones. Shell bonding, etc.