| abstract |
The present disclosure provides a polyurethane adhesive and a prepreg thereof for manufacturing a plastic athletic track. The polyurethane adhesive includes a urethane prepolymer which is formed by a reaction between an isocyanate and a polyol. The polyol is selected from the group consisting of polyether polyols and polybutadiene polyols, and a number average molecular weight of the polyol is between 1,000 g/mole and 6,000 g/mole. Base on the total weight of the polyurethane adhesive that is 100% by weight, the content of the urethane prepolymer is between 80% and 99.5% by weight, and the viscosity of the polyurethane adhesive is between 1,000 cps and 3,000 cps under 15 °C to 40 °C. Therefore, the polyurethane adhesive is in a liquid state under normal temperature and has characteristics of low viscosity and long operation time, thereby facilitating the wetting of the plastic particles by the polyurethane adhesive. |