Rice hull-based polyurethane adhesive containing rice husk-based polyhydric alcohols, and preparation method thereof

The invention relates to a method used for synthesizing high-molecular materials from biomass, and specifically discloses a rice hull-based polyurethane adhesive containing rice husk-based polyhydric alcohols and a preparation method thereof. According to the preparation method, rice hull powder is subjected to liquidation under certain conditions so as to prepare the rice husk-based polyhydric alcohols; the rice husk-based polyhydric alcohols, polyester polyols, and isocyanate are taken as raw materials, dioxane is taken as a solvent, in the presence of catalyst dibutyltin dilaurate, a polyurethane prepolymer is prepared; and then a small molecule chain extender is added for chain extension so as to obtain the polyurethane adhesive emulsion. Full utilization of rice hull resource which is cheap, easily available, and renewable is realized; dependence on fossil resource is relieved; operation is simple and is convenient to control; the obtained rice hull-based polyurethane adhesive emulsion is excellent in film forming ability, high in solid content, high in bonding strength, and excellent in mechanical properties, and possesses relatively high market competitiveness.