The reaction mechanism of curing epoxy resin with imidazole curing agent
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Last Update: 2020-03-25
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Source: Internet
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Author: User
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There are 1-secondary amine nitrogen atom and 3-tertiary amine nitrogen atom in the molecular structure of imidazole curing agent When curing the epoxy resin, it is generally believed that the 3-position nitrogen atom on imidazole ring first makes the epoxy group ring opening in the epoxy resin, when there is hydrogen atom on 1-position nitrogen atom, hydrogen transfer occurs, and then 1-position nitrogen atom reacts with the epoxy resin to form 1:2 addition product; When there are substituents on the 1-n atom, the 1-n atom does not react with the epoxy resin, only the 3-N atom makes the epoxy group in the epoxy resin open to form a 1:1 addition product In the above two cases, the oxygen anion produced by the final ring opening of epoxy group continues to catalyze the ring opening polymerization of epoxy resin.
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