Poly-isocyanurate polyurethane coating curing agent and preparation method thereof

Abstract

The invention relates to a poly-isocyanurate polyurethane coating curing agent and a preparation method thereof. The curing agent is isozyanurat ring-containing structure and polyurethane prepolymer solution of which end is sealed by NCO group by the means that isozyanurat-based polyether glycol is reacted with polyisocyanate in acetate dissolvants, and polymerization inhibitor is further added into the solution. The curing agent has the chemical structure which is similar to isocyanate tripolymer curing agent; the curing agent is low in viscosity, good in storing stability, and low in cost; and the hydroxy acrylic resin and the alkyd resin are good in consistency. The prepared film has the characteristics of being good in adhesive force, flexibility, thermostability, weather resistance and corrosion resistance, high in hardness and the like, thereby being applicable to the high-grade field of vehicle painting.

Description

technical field

[0001] The invention belongs to the technical field of polyurethane curing agent synthesis, and in particular relates to a polyisocyanurate polyurethane coating curing agent with good compatibility and a preparation method thereof. Background technique

[0002] At present, the most commonly used polyurethane coating curing agent in China is mostly a prepolymer formed by the reaction of trimethylolpropane and toluene diisocyanate. As a universal curing agent for polyurethane, it has the characteristics of high storage stability, good leveling, fast drying, and easy sanding. It can be used in the preparation of high-gloss, matte topcoats and primers. As for the coating curing agent with fast drying of the coating film, high requirements on matting property and yellowing resistance, most of the coating curing agents currently use isocyanate trimer curing agent. Common trimer products currently on the market mainly include TDI trimer, HDI trimer, IPDI trimer, TD...

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