Key advantages of adhesives with different compositions

I. Epoxy Resin Adhesives
1. Epoxy resins are characterized by high mechanical strength, a dense chemical structure, and strong cohesive forces; consequently, epoxy adhesives exhibit excellent bonding performance.
2. Epoxy resins have low volumetric shrinkage and linear expansion coefficients, resulting in minimal internal stress and excellent processing characteristics.
3. Epoxy resins generate virtually no low-molecular-weight volatiles during curing, leading to superior electrical properties.
4. Free from impurities such as salts and alkalis, epoxy resins are highly stable and resistant to degradation.
5. However, epoxy resins have moderate heat resistance and exhibit poor adhesion to low-polarity materials (such as PP and fluoroplastics); surface activation treatment is required for these materials.
II. Polyurethane Adhesives
1. Polyurethanes offer a wide range of hardness levels and high mechanical strength, along with excellent wear and impact resistance; these properties are imparted to polyurethane adhesives.
2. Polyurethane adhesives exhibit excellent flexibility and elasticity at low temperatures.
3. Polyurethane adhesives offer excellent weather, oil, and aging resistance.
4. However, due to the unique chemical structure of polyurethane, these adhesives are unsuitable for use in high-temperature or high-humidity environments during the bonding process.
III. Silicone
Silicone is currently the most widely used adhesive on the market.
1. Silicone possesses excellent electrical properties, a wide operating temperature range, good flexibility, and low stress characteristics.
2. Silicone does not generate heat during curing; it is low-toxicity and exhibits minimal shrinkage after curing, making it highly popular among workers who use adhesives.
3. Silicone is chemically stable and corrosion-resistant.
The above summarizes the advantages of various chemical types of adhesives.