| 摘要 |
A polyurethane adhesive, suitable for bonding of shoe uppers to shoe soles, is based on an isocyanateterminated prepolymer made from tolylene diisocyanate, a poly(tetramethyleneoxy) glycol, and a poly(ethyleneoxy) compound having 7-30 ethyleneoxy groups and 1 or 2 hydroxyl groups. This prepolymer can be cured with a mixture of a methylenedianiline/sodium chloride complex with urea at a temperature of 70 DEG C, which is safe for the usual shoe materials. Adhesive compositions containing both the prepolymer and the curing agent have at room temperature a potlife of at least 24 hours.
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