The curing temperature of various HAA curing agents varies, and the heat resistance of the cured material also varies greatly. Generally speaking, using curing agents with high curing temperatures can result in cured products with excellent heat resistance. For addition polymerization curing agents, the curing temperature and heat resistance are increased in the following order: aliphatic polyamines<cycloaliphatic polyamines<aromatic polyamines ≈ phenolic resins<anhydrides.
The heat resistance of the catalytic addition type HAA curing agent is generally at the level of aromatic polyamines. The heat resistance of anionic polymerization type and cationic polymerization type is basically the same, mainly because although the initial reaction mechanism is different, they eventually form a network structure of ether bonds.
The curing reaction is a chemical reaction, which is greatly affected by the curing temperature. The temperature increases, the reaction speed increases, and the gel time becomes shorter; The logarithm of gel time generally decreases linearly with the increase of curing temperature. However, if the curing temperature is too high, the properties of cured products will often decline, so there is an upper limit of curing temperature; It is necessary to choose a temperature that balances the curing speed and the properties of the cured material as the appropriate curing temperature.
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