Epoxy resin performance characteristics

(1) High mechanical properties. Epoxy resin has strong cohesion and dense molecular structure, so its mechanical properties are higher than general-purpose thermosetting resins such as phenolic resin and unsaturated polyester.

(2) 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, and imparts epoxy cured products to metals, ceramics, glass, concrete, wood, etc. The substrate has excellent adhesion.

(3) The curing shrinkage rate is small. Generally it is 1% to 2%. It is one of the varieties with the lowest cure shrinkage in thermosetting resins (8% to 10% for phenolic resins; 4% to 6% for unsaturated polyester resins; 4% to 8% for silicone resins). The coefficient of linear expansion is also small, generally 6 x 10-5 / °C. Therefore, the volume changes little after curing.

(4) Good processability. When the epoxy resin is cured, substantially no low molecular volatiles are produced, so that it can be formed by low pressure molding or contact compression molding. It can be used together with various curing agents to produce environmentally friendly coatings such as solvent-free, high-solids, powder coatings and water-based coatings.

(5) Excellent electrical insulation. Epoxy resin is one of the best electrical properties of thermosetting resins.

(6) Good stability and excellent chemical resistance. An epoxy resin containing no impurities such as alkali or salt is not easily deteriorated. As long as it is stored properly (sealed, not exposed to moisture, high temperature), its shelf life is 1 year. If it passes the inspection after the expiration, it can still be used. The epoxy cured product has excellent chemical stability. Its resistance to alkali, acid, salt and other media is better than that of unsaturated polyester resins, phenolic resins and other thermosetting resins. Therefore, epoxy resin is widely used as an anti-corrosion primer, and the epoxy resin cured product has a three-dimensional network structure and can be impregnated with oil, etc., and is widely used in oil tanks, oil tankers, and the inner wall lining of an entire fuel tank of an aircraft.

(7) The heat resistance of the epoxy cured product is generally 80 to 100 °C. The heat resistant type of epoxy resin can reach 200 ° C or higher.