(1) High mechanical properties. Epoxy resin has strong cohesion and dense molecular structure, so its mechanical properties are higher than those of general-purpose thermosetting resins such as phenolic resin and unsaturated polyester.
(2) The coating of the plastic-coated fire pipe adopts epoxy resin, which has strong adhesion. The epoxy resin curing system contains extremely active epoxy groups, hydroxyl groups, and polar groups such as ether bonds, amine bonds, and ester bonds, which endow the epoxy cured product with polar groups such as metals, ceramics, glass, concrete, and wood. material with excellent adhesion.
(3) Small curing shrinkage. Generally 1% to 2%. It is one of the varieties with the smallest curing shrinkage among thermosetting resins (phenolic resin is 8% to 10%; unsaturated polyester resin is 4% to 6%; silicone resin is 4% to 8%). The coefficient of linear expansion is also very small, generally 6×10-5/℃. So the volume changes little after curing.
(4) Good workmanship. Epoxy resin basically does not produce low molecular volatiles during curing, so it can be low pressure molding or contact pressure molding. It can be used with various curing agents to manufacture environmentally friendly coatings such as solvent-free, high-solid, powder coatings and water-based coatings.
(5) Excellent electrical insulation. Epoxy resins are thermosetting resins with good antistatic properties.
(6) Good stability and excellent chemical resistance. Epoxy resin that does not contain impurities such as alkali and salt is not easy to deteriorate. As long as it is stored properly (sealed, protected from moisture and high temperature), its storage period is 1 year. After the expiration date, it can still be used if it passes the inspection. The epoxy cured product has excellent chemical stability. Its corrosion resistance to various media such as alkali, acid and salt is better than that of thermosetting resins such as unsaturated polyester resin and phenolic resin. Therefore, epoxy resin is widely used as an anti-corrosion primer, and because the epoxy resin cured product has a three-dimensional network structure and is resistant to impregnation of oil, etc., it is widely used in oil tanks, oil tankers, and integral fuel tank linings of aircraft.
(7) The heat resistance of the epoxy cured product is generally 80 to 100°C. The heat-resistant varieties of epoxy resins can reach 200℃ or higher.
