METHOD FOR PRODUCING LATENT CURING AGENT FOR POWDER EPOXY RESIN, LATENT CURING AGENT FOR POWDER EPOXY RESIN OBTAINED BY THE METHOD, AND CURABLE EPOXY RESIN COMPOSITION USING THE SAME

摘要

the present invention has the step of the of (A) ~ (F), method of producing a latent curing agent for epoxy resins, characterized in that, the latent curing agent for epoxy resin powder and, at the same time heat curing and the storage stability is excellent even invention provides an improved curable epoxy resin composition. (A) in a solvent (a1), the amine compound (a2) an epoxy resin and (a3) reaction of the heating process, (B) to (B1) ~ (B3) of any one of the processes: ( B1) to remove the solvent (a1), the amine compound (a2) is reacted with an epoxy resin (a3) bringing the resulting solid (b1) step, (B2) by removing the solvent (a1), amine compound (a2) and remove the epoxy resin (a3) reaction with (b1), which was added to the phenolic resin (b2) in the heating, melting, dehydration by bringing the solid (b3) process, and, ( B3) (A) was added to a phenol resin (b2) the reaction product of the process after removal of the solvent (a1), and heating, melting, dehydration, and the amine compound (a2) an epoxy resin and (a3) reaction with (b1 ) and phenol resin (b2) a mixture of solid (b3) the pulling process, (C) the solid material (b1) or (b3) a fine powder of the pulverized to a volume average particle diameter of 0.1 ~ 10 (c1) the obtaining step, (D) and then water was added uniformly in the epoxy resin (d1), the fine particles (c1) is added a uniform mixture (d2) a step of obtaining, (E ) by the infrared absorption of the NCO, until it is confirmed the disappearance of the polyisocyanate (e1), by reacting the polyisocyanates (e1) to the mixture (d2) obtaining the reaction product (e2) processes, and, (F) the addition of a non-polar solvent (f1) to the reaction (e2) mixed, and then filtered and dried to obtain a powdery epoxy resin latent curing agent.