| abstract |
A two-component polyurethane adhesive with high oil resistance and high temperature cooking resistance and a preparation method thereof belong to the technical field of polyurethane. The preparation method of component A includes the following steps: putting polybasic acid, polyol and antioxidant into a reaction kettle successively, introducing nitrogen protection, stirring to heat up, and completing the esterification after the reaction; then the temperature of the vacuuming reaction kettle is controlled at Between 230-250 ℃, the polycondensation reaction of acid and alcohol is completed, and the polyester polyol with terminal hydroxyl group is obtained; during the chain extension process, the polyester polyol, chain extender and catalyst A are added into the reaction kettle, and the temperature is raised to 85 ℃ with stirring After the reaction, after the index is qualified, the temperature is lowered to 40-60°C, ethyl acetate, polyether polyol, acid anhydride, epoxy resin, and adhesion promoter are added to dilute and stir evenly; and then mixed with component B. The invention solves the problems of easy delamination and low peeling strength of the oily water content of the existing composite film after being cooked at a high temperature of 121°C. |