UNTOXIC URETHANE ADHESIVE COMPOSITION FOR MANUFACTURING SANDWICH PANEL

摘要

Provided is an eco-friendly urethane adhesive composition for producing sandwich panels, which contains no organic solvent so as to minimize emission of volatile organic compounds, and shows a high curing rate by adding imidazole based compound as curing accelerator to prevent interlayer separation of a sandwich panel after adhesion. The eco-friendly urethane adhesive composition comprises: a polyester polyol end-capped with a hydroxyl group as polycondensate of a polyol containing at least two OH groups and a polybasic acid containing at least two carboxylic acid groups; a curing agent formed of a diol as a chain extender for the polyol and a catalyst; a mixture of a diisocyanate with a diol as a base for an urethane adhesive; and an imidazole-based curing accelerator. The polyester polyol as an average molecular weight of 3,000-8,000, the diol and the catalyst are used in a weight ratio of 1:0.1-1, the polyester polyol and the mixture of the diol with the catalyst are used in a weight ratio of 10:1-5, the diisocyanate and the diol are used in a weight ratio of 1:0.05-5. The base materials for an urethane adhesive and the curing agent are used in a weight ratio of 1:0.5-1, and the curing accelerant is used in an amount of 0.01-1 wt% based on the total weight of the composition.