| 摘要 |
FIELD: organic chemistry. SUBSTANCE: claimed invention describes moisture induced fusible polyurethane-based adhesive comprising at least one polyurethane prepolymer consisting of at least one polyisocyanate, one polyalkylene glycol and one polyester glycol. Said polyester glycol is plyester glycol having vitrification temperature ranging from -40 to +50 C, said prepolymer consisting 15-35 wt% polyisocyanate; 10-70 wt% polyalkylene glycol and 5-65 said polyester glycol, when this fusible adhesive is used in footwear industry, its technological performance, e.g. creep resistance, is satisfactory. The required initial strength can be obtained rather quickly. The claimed adhesive is stable when in storage, that is no stratification occurs. Said adhesive moistures rubber or leather to sufficient measure and penetrates rather deep into fibrous materials; when cooled at ambiant temperature, there occurs immediate bonding with high initial strength and high creep resistance; cemented areas remain flexible also at low temperatures. After cemented areas become hardened, they are highly resistant to water effects. EFFECT: improved properties of the adhesive. |
