Лако-красочные материалы — производство

Epoxy resins are a very important class of thermosetting synthe­tic polymers used in coatings, adhesives and composites. Epoxy resins are characterized by having three-membered epoxy (also called oxirane or epoxide) functional groups as reactive sites for cross-linking. A typical terminal epoxy group, as depicted below, is commonly known as a glycidyl group.

Glycidyl group

These resins have been commercially available for more than half a century and are used in a diverse range of applications such as coatings, plastics, adhesives, and construction chemicals due to their important characteristics, as listed below.

• Excellent adhesion to a wide range of substrates

• Chemical and water resistance

• Corrosion resistance

• High electrical resistance

• Better heat resistance than most general binders used in coatings

• Resistance to hydrolysis

• Excellent toughness, hardness and flexibility

• Ability to have properties varied or balanced through chemistry

• Wide latitude of curing agents and chemistries.

Besides these excellent characteristics, one major limitation associ­ated with common classes of epoxy resins is their poor durability in exterior conditions. Nevertheless, epoxy resins have been the work­horse of high performance polymers for protective coatings where high corrosion and chemical resistance are important.