Environmentally friendly wet strength agent LQ-6515 is an improved wet strength agent for polyamide epichlorohydrin resin (PAE). It has the advantages of low chlorine (the content of 1,3-dichloro-2-propanol and 3-chloro-1,2-propanediol is less than 5‰), high effective content and good wet strength effect. EU standards for residual chlorine by-products.