Curing agent, also known as hardener, curing agent or setting agent, is a class of substances or mixtures that enhance or control curing reactions. Resin curing is a process of irreversible change of thermosetting resin through condensation, closed-loop, addition or catalysis and other chemical reactions, curing is completed by adding curing (crosslinking) agent. Curing agent is an essential additive, whether it is used as adhesive, coating, castable, it is necessary to add curing agent, otherwise the epoxy resin can not cure. The variety of curing agent has a great impact on the mechanical properties, heat resistance, water resistance, corrosion resistance and so on

Coal tar fractiation 280℃~360℃ distillate is called anthracene oil, large viscosity, solid precipitation at room temperature, is the manufacturing of paint, electrode, asphalt coke, carbon black, wood anti-corrosion oil and insecticides and other raw materials, mainly used to extract crude anthracene, acenacene, fluorene, fenanthrene, carbazole and other chemical raw materials, used to allocate carbon black raw material oil, road asphalt or fuel oil, etc. It can also be used for wood preservation and preparation.
Anthracene oil is a part of the coal tar components, through the distillation of tar cut 280℃~360℃ fractions, generally yellow-green oily liquid, crystallization at room temperature, crystallization yellow, blue fluorescence, soluble in ethanol and ether, insoluble in water, partially soluble in hot benzene, chlorobenzene and other organic solvents, there is a strong irritation. It can be burned by open fire at high temperature, and its main components are anthracene, phenanthrene, fluorene, acenaphthene, carbazole and so on.