Denaturalizing curing agent and its production manner and two-component type polyurethane resin paint null poriisoshianeto for the two-component type

摘要

Disclosed is a curing agent for two-package polyurethane resin coating materials, which can effectively improve the problem of deterioration in solvent resistance.  Also disclosed are a method for producing the curing agent for two-package polyurethane resin coating materials, and a two-package polyurethane resin coating material. The curing agent for two-package polyurethane resin coating materials contains, as a main component, a modified polyisocyanate which is obtained by modifying a polyisocyanate with a modifying agent which has a functional group that exerts a catalytic action in a reaction with a base material containing a hydroxyl group and an active hydrogen.  Preferably, the polyisocyanate includes one or both of an isocyanurate group and an allophanate group, or is composed of an aliphatic polyisocyanate or an alicyclic polyisocyanate.  The modifying agent is composed of an organic non-metal compound, and the base material is composed of an acrylic resin.  The two-package polyurethane resin coating material is composed of a curing agent for two-package resin coating materials and a base material containing an active hydrogen.