Epoxy resin 

        Epoxy resin (Epoxy Resin): refers to the molecular structure containing two or more epoxy groups and 2 in the presence of a suitable chemical reagent capable of forming a generic three-dimensional network of the cured compounds are an important class of thermosetting resin.
        Both the epoxy group of epoxy oligomer, including low molecular weight compound containing an epoxy group. Epoxy resin as adhesives, coatings and composites resin matrix, widely used in water conservancy, transportation, machinery, electronics, home appliances, automotive and aerospace fields.

First, the performance characteristics of epoxy resin and cured 

       (1) High mechanical properties. An epoxy resin having a strong cohesion, a dense molecular structure, its mechanical properties than a phenolic resin and an unsaturated polyester resin, thermosetting general. 

        (2) Strong adhesion. Epoxy curing system comprising the active great epoxy, hydroxyl and ether bond, an amine bond, an ester bond and other polar groups, giving the cured epoxy to metal, ceramic, glass, concrete disabilities, wood pole substrate with excellent adhesion. 

        (3)Curing shrinkage. Typically at 1% to 2%. The thermosetting resin is minimal shrinkage of the cured varieties (8% phenolic resin and 10%; unsaturated polyester resin is 4% to 6%; silicone resin is 4% to 8%). Linear expansion coefficient is small, typically 6 × 10-5 / ℃. Therefore, little volume change after curing. 

       (4)Excellent electrical insulation resistance. Epoxy resins are one of the best varieties of thermosetting resin dielectric properties. 

       (5) Technology is good. When the epoxy resin curing substantially no low molecular weight volatiles, the contact pressure may be low-pressure molding or forming. Can be manufactured with a variety of curing agents with solvent-free, high solids, powder coatings and environmentally friendly water-based paints and other coatings.

       (6) Good stability, good chemical resistance. No alkali, salt and other impurities epoxy non-perishable. As long as proper storage (sealed, no moisture, not when the temperature), the storage period of 1 year. After extended if the inspection can be used. Epoxy cured with excellent chemical stability. Its wide range of media corrosion resistance and alkali, acid, salt and other than unsaturated polyester resins, phenolic resins and other thermosetting resins. So a lot of use as anti-corrosion epoxy primer, epoxy resin cured because of a three-dimensional network structure, but also the ability of dipping oils, etc., widely used in tanks, tankers, aircraft integral fuel tank internal wall linings.

       (7) Heat resistance of the cured epoxy is generally 80 ~ 100 ℃. Epoxy heat up to 200 ℃ or higher breed.

Epoxy resin, there are some disadvantages such as poor weather resistance, an epoxy resin containing an aromatic ether bond is generally cured by chain scission degradation of the sunlight is easy, it is usually a bisphenol A type epoxy resin cured sun outdoors, easy to lose luster, gradually chalking, and therefore should not be used as outdoor finish. In addition, the poor performance of low temperature curing epoxy resin, curing normally takes more than 10 ℃, below 10 ℃ curing slow winter season for large objects such as construction of ships, bridges, harbors, tanks and other very inconvenient.