When someone asks you what epoxy is, throw this article to him!

01
History of epoxy
Epoxy Resin Development began in the 1930s, and in 1934 P. Schlack of I.G. Farben in Germany found that the use of amine compounds allowed compounds containing many epoxy groups to be synthesized into polymer compounds, resulting in low shrinkage plastics, thus obtaining a German patent.
I.G. Farben Laboratory
After I.G. Farben Laboratory, Pierre Castan of Gebr.de Trey of Switzerland and S.O. Greelee of Devoe and Raynolds of the United States used biphenol A and epoxy chloropropane to regetent to make epoxy resins, which can be cured with organic polyamines or phthalates and have excellent bonding properties. Soon after, Ciba of Switzerland, Shell of the United States and DOW Chemical began research and development of industrial production and application of epoxy resins
in
.
the development of epoxy resin in China began in 1956,
was
in Shenyang and Shanghai were the first success. In 1958, Shanghai and Wuxi began industrial production, and by the end of the 1970s, China had formed a complete industrial system from monosomes, resins and auxiliary materials, from scientific research and production to application. In recent years, The development and application of epoxy resin in China has developed rapidly, the output is increasing, the quality is constantly improving, and new products are emerging.
In 1958, the local state-owned Wuxi resin factory Huishan plant gate
02
epoxy resin application
epoxy resin excellent physical machinery and electrical insulation properties, bonding properties with various materials, and the flexibility of its use process is not available in other thermosostical plastics. Therefore, it can be made into coatings, composites, casting materials, adhesives, molding materials and injection molding materials, in various fields of the national economy has been widely used.
03
Epoxy resin and curing properties
high regenerative properties
epoxy resins have a strong cohesion, molecular structure dense, resulting in higher regenerative properties than phenolic resins and unsaturated polyester and other general-purpose thermosolytic resins.Adhesion strong
epoxy resin curing system contains a very active epoxy, hydroxyl and ether bond, amine bond, ester bond and other polar groups, giving epoxy resin to metal, ceramic, glass concrete, wood and other polar materials with excellent adhesion.
curing shrinkage is small
epoxy resin curing shrinkage rate is generally 1% to 2%, is one of the least curing shrinkage in thermostate resin (phenolic resin 8
% to 10%
, unsaturated polyester is
4% to 6%
, silicone resin is
4% to 8%
). And the linear expansion coefficient after curing is also very small, so the volume after curing changes little.
Good process
epoxy curing chamber basically does not produce low-molecular volatiles, so low-pressure molding or contact pressure molding, with a variety of curing agents in conjunction with the manufacture of solvent-free, high solids, powder coatings and water-based coatings and other environmentally friendly coatings.
excellent electrical insulation
epoxy resin has good electrical insulation, is one of the thermooenstic resin intermediary electrical performance of one of the best varieties.
stability, corrosion resistance is strong
containing alkali, salt and other impurities of epoxy resin is not easy to change. As long as the storage is well-stocked (sealed, free from moisture, free from high temperatures), its storage period is 1 year. And epoxy curing has excellent chemical stability, acid-alkali salt and other media corrosion performance is better than unsaturated polyester, phenolic resin and other thermostat resins, therefore, epoxy resin can be used as a large number of corrosion-proof primers, but also because epoxy resin curing into a three-dimensional mesh structure, has the ability to withstand oil and other impregnation, a large number of applications in oil tanks, oil tankers, aircraft, such as the overall mailbox wall lining.
Of course, epoxy resin also has some disadvantages, such as poor weather resistance, epoxy resin generally contains aromatic ether bonds, curing by sunlight after easy degradation of the broken chain, so the usual BPA type A epoxy resin curing In the outdoor sun, easy to lose luster, gradually powdered, so it should not be used as outdoor paint, in addition, epoxy resin low-temperature curing performance is poor, therefore, for large objects such as ships, bridges, harbors, oil tanks and other cold season construction is very inconvenient.