Curing agent selection
(1) Consider the variety and performance of curing agent
The type of curing agent has a great influence on the mechanical properties, heat resistance, water resistance and corrosion resistance of the cured product. For example, the curing agent of aromatic polyamine, imidazole, acid anhydride and the like has higher heat resistance than fat. Group polyamine, low molecular weight polyamide curing agent; aromatic acid anhydride cured epoxy resin is better than aromatic diamine and aliphatic polyamine curing agent; triethylene tetramine curing agent has good alkali resistance, but acid resistance and Formaldehyde resistant solution is poor. The alicyclic polyamine (e.g., isophorone diamine) cured epoxy resin is excellent in chemical resistance. The anhydride curing agent curing epoxy resin has better alkali resistance than acid resistance. Appropriate curing agents should be selected for different applications and performance requirements.
(2) Combination of several curing agents
A combination of several curing agents can be used to achieve synergistic effects, such as low molecular weight polyamide curing agent with a small amount of m-phenylenediamine curing agent, which can cure at room temperature and increase the toughness of the cured product while appropriately improving heat resistance. Sex. Triamellitic anhydride (TMA) is used in combination with methyltetrahydrophthalic anhydride. The eutectic mixture has low viscosity (25 ° C, 200-250 mPa·s), and is easy to mix with epoxy resin to improve the processability.
(3) Pay attention to the environmental protection of curing agents
The curing agent selected should be harmless to the human body and has no pollution to the environment. Ethylenediamine should not be used alone as a curing agent, and a modified amine curing agent should be used as much as possible.
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