HAA-based curing agent as well as preparation method and application thereof

The invention discloses an HAA-based curing agent as well as a preparation method and application thereof. The curing agent is prepared from the following components: 48-80 parts of HAA, 10-40 parts of a chain extender, 1-20 parts of a fusion agent and 0.2-2.0 parts of an accelerant. The chain extender is adopted to increase C10, C12 and C13 chain segments in HAA chain segments, the lipophilicity of the curing agent is greatly improved, the curing agent can be fully mixed with polyester resin, the sagging problem generated after HAA curing is fully solved, meanwhile, generation of water in the curing process is reduced by adding polyvinyl alcohol in the reaction process, water generated in the reaction of alcohol and acid is removed in advance, the pinhole problem is solved, and hydroxyl of polyvinyl alcohol can be partially crosslinked by extrusion under the condition that the temperature is controlled to be 130-170 DEG C in the reaction process, so that the lipophilicity of the curing agent is better improv