The function of epoxy resin coatings can be distinguished by the variety of epoxy resin curing accelerators. The emphasis is put on the following aspects: improving the mechanical function of epoxy resin coatings. Poor and brittle problems can be improved by introducing curing agents with flexible segments, such as polyamides with long chain fatty acids.
Improving the technological function of epoxy resin coatings. Epoxy resin coatings are often used in large-scale construction on site. There are toxicity of volatiles and maneuverability problems in wetting and cryogenic environments. In recent years, a variety of non-toxic or low-toxic curing agents with good workability, mechanical function and corrosion resistance have been developed at home and abroad, such as modification. Keto imide curing agents.
The epoxy resin cured with amine curing agent has good alkali resistance and poor acid resistance. The tertiary amine structure formed after curing is easy to react with acid to form tertiary ammonium salt. It is poor because of the irreversible hydrolysis reaction of ester groups caused by curing.
The temperature resistance of epoxy resin coatings is improved. Aliphatic amine curing agent is selected to curing epoxy resin, and its thermal deformation temperature is low, usually only 70-80 C. Selecting suitable aromatic curing agent or anhydride curing agent can raise the thermal deformation temperature to 150 C, but the latter two curing agents usually need to be cured under heating alone.
The dielectric function of epoxy resin coatings can be improved. When epoxy resin is used in insulating coatings, the modified copolymer of trimellitic anhydride can be selected as curing agent, which can obviously improve the heat resistance and dielectric function of the coatings.
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