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First, epoxidized soybean oil polyol (ESOP) with high hydroxyl value and moderate viscosity was prepared by the ring-opening reaction of epoxidized soybean oil (ESO). Second, the triphenylmethane-4,4′,4″-triisocyanate (TTI)/ESOP adhesives were prepared by mixing the ESOP with the TTI for the purpose of chemically modifying the TTI. The results of FT-IR and SEM showed the -NCO groups in the TTI reacted with the -OH groups in the ESOP to form a cross-linked structure. In addition, the effects of the isocyanate index, R[n(-NCO)/n(-OH)], i.e., the molar ratio between the isocyanate groups (-NCO) and hydroxyl groups (-OH), on the curing properties, adhesion properties, water resistance, and thermal stability of the TTI adhesives were investigated by means of a digital viscometer, bonding tensile shear strength test, contact angle test, and thermo-gravimetric analysis (TGA), respectively. The results showed that at  R  = 1.25, the TTI/ESOP adhesives had the best overall performance; the viscosity of the TTI increased to 3190 mPa s after this modification, and the curing time significantly shortened, from 8 to 2.5 h, the solid content substantially increased, from 23.1% to 56% and the tensile shear strength of the metal–metal samples held together by the adhesives increased from 0.37 to 2.78 MPa. Compared with the TTI, the contact angle between the cured adhesive layer increased from 85.5° for TTI to 93.8° for the TTI/ESOP, and the thermal stability was also enhanced.

journal of macromolecular science, part b

Study on Preparation and Performances of the Triphenylmethane-4,4′,4″-Triisocyanate (TTI)/Epoxidized Soybean Oil Polyol (ESOP) Adhesives Modified by Vegetable Oil Polyol