It is a high molecular polymer with the molecular formula (C11H12O3)n.
It refers to the general name of a class of polymers containing more than two epoxy groups in the molecule.
It is the condensation product of epichlorohydrin and bisphenol A or polyol. Due to the chemical activity of the epoxy group, a variety of compounds containing active hydrogen can be used to open the ring and solidify and cross-link to form a network structure, so it is a thermosetting resin. Bisphenol A-type epoxy resin not only has the largest output and the most complete varieties, but also new modified varieties are still increasing, and the quality is constantly improving.
Appearance yellow or transparent solid or liquid.
Classification criteria
The classification of epoxy resin has not yet been unified. It is generally classified according to strength, heat resistance level and characteristics. There are 16 main varieties of epoxy resin, including general glue, structural glue, high temperature resistant glue, low temperature resistant glue, and water and wet surface use. 16 types of adhesives, conductive adhesives, optical adhesives, spot welding adhesives, epoxy resin films, foam adhesives, strain adhesives, soft material adhesives, sealants, special adhesives, latent curing adhesives, and civil construction adhesives.
Several Classifications
There are several ways to classify epoxy resin adhesives in the industry:
1. According to its main components, it is divided into pure epoxy resin adhesive and modified epoxy resin adhesive;
2. According to their professional uses, they are divided into mechanical epoxy resin adhesives, construction epoxy resin adhesives, electronic epoxy resin adhesives, repair epoxy resin adhesives, traffic glues, and shipbuilding glues. wait;
3. According to its construction conditions, it is divided into normal temperature curing glue, low temperature curing glue and other curing glue;
4. According to its packaging form, it can be divided into single-component glue, two-component glue and multi-component glue;
There are other classification methods, such as solvent-free glue, solvent-based glue and water-based glue. However, component classification is widely used.
Foreign epoxy resin varieties and brands
The most widely used variety in the world is bisphenol A epoxy, followed by brominated bisphenol A and phenolic epoxy resins.The production and use of other varieties is very small.
There are only a few brands of bisphenol A type epoxy resin actually produced in China. According to statistics, the national demand for epoxy resin in 1997 was about 110kt, the production volume was about 30kt, and the import volume was about 60kt. Domestic epoxy production varieties and brands are very single, mainly bisphenol A type. Due to the poor quality of domestic epoxy, many high-demand situations must import foreign high-quality epoxy, such as high-quality liquid epoxy, brominated epoxy, phenolic epoxy, etc.Distribution of epoxy resin in various industries，Epoxy resin is mainly used in the coatings industry and the electronics industry. Epoxy for composite molding (mainly used in printed circuit boards in the electronics industry) accounts for a quarter.
Application areas
▪ Coating use
▪Adhesive use
▪Electronic and electrical appliances
Market expectation:
China is the world’s largest and last virgin market for epoxy resin, and the prospects for the Chinese epoxy market are very broad.
Epoxy coating (anti-corrosion, anti-marine biological pollution). Experts predict that my country will need 40,000 tons of marine coatings in 2000, most of which are epoxy anticorrosive coatings.
The container manufacturing industry continues to develop at a rapid pace, and can coatings require more and more epoxy resins.
The Northeast region is bound to be a huge potential market for epoxy resin.
Water-based epoxy coatings have a bright future. These two are the mainstream of epoxy coating development. China is the fourth largest powder coating producer in the world and the largest powder coating producer in Asia. Our government has identified powder coatings and water-based coatings as priority development varieties in the future, and water-based epoxy coatings occupy an important position in the water-based coatings industry.
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