(1) considering the varieties and properties of curing agent

Variety of curing agents on the mechanical properties of cured, heat resistance, water resistance, corrosion resistance and so on have very big effect, such as the heavy aromatic amine, imidazole, acid anhydride curing agent heat resistance of cured epoxy resin was higher than aliphatic amine, low molecular polyamide curing agent; Aromatic acid anhydride curable epoxy resin's water resistance is better than that of aromatic diamine and aliphatic amine curing agent; Sanya ethyl four amine curing agent good alkali resistance, but poor resistance to acid and formaldehyde solution resistance. More than alicyclic amines (such as isophorone diamine) drug resistance of cured epoxy resin is good. Anhydride curing agent of epoxy resin curing alkali resistance is better than that of acid resistance. According to different purposes and performance requirements choose proper curing agent.

2 compound use several kinds of curing agent

Compound use several kinds of curing agent, can get the result of bring out the best in each other, such as low molecular polyamide curing agent with a small amount of m-phenylene diamine curing agent, as well as room temperature curing, and can make the curing toughness increase appropriately increase the heat resistance at the same time. Trimellitic anhydride (TMA) and methyl benzene anhydride compound using four hydrogen, eutectic mixture low viscosity (25 ℃ and 200 ~ 250 mpa, s), mixed with epoxy resin, improve the manufacturability.

(3) focus on curing agent of environmental protection

Chooses the curing agent to deal with the human body without harm, on the environment pollution-free, ethylenediamine never used as a curing agent alone, as far as possible using modified amine curing agent.