Method for preparing polyether polyol by liquefying agricultural wastes

Abstract

The invention provides a method for preparing biomass-based polyether polyol by taking agricultural wastes as raw materials through non-catalytic solvothermal liquefaction, and belongs to the technical field of chemical new materials and biomass high-quality utilization. According to the method, expanded agricultural waste is used as a raw material, a mixture of glycerol and triethylene glycol isused as a liquefying agent, and polyether polyol is prepared through a non-catalytic solvothermal reaction; and the liquefaction rate of the raw material reaches up to 98.8% under a proper liquefaction reaction condition. The hydroxyl value of the obtained polyether polyol is 350 to 476.0 mg KOH / g; the viscosity is 430.5-862.0 mPa.s; the performance of the rigid polyurethane foam prepared from theliquefied product meets the requirements of the industrial standard (JG / T314-2012) of rigid polyurethane foam composite insulation boards,. The method has the advantages of simple equipment and technique and wide raw material sources, and is a feasible way for high-quality utilization of bagasse.

Description

technical field [0001] The invention relates to the technical field of new chemical materials and high-quality utilization of biomass, in particular to a method for preparing polyether polyols by catalytic solvent thermal liquefaction of agricultural and forestry wastes. Background technique [0002] Polyurethane (PU) is one of the most widely used polymer materials at present. It is a body-shaped polymer formed by the polycondensation reaction of isocyanate and polyol. Since the two main raw materials used come from petroleum, limited by the non-renewability of petroleum sources and the non-environmental protection of products, polyurethane production raw materials derived from renewable resources have received widespread attention worldwide. Biodegradable biomass has become a research hotspot as a raw material for polyurethane production. Agricultural waste (various plant stalks, peanut shells, bagasse, etc.) is a renewable resource with a wide range of sources, with larg...

AI Technical Summary

Problems solved by technology

[0005] The liquefaction process using liquid mineral acids such as sulfuric acid as a catalyst has problems such as catalyst post-treatment and equipment corrosion, and the liquefaction process using solid acid as a catalyst has the reality of high production costs due to the complexity of the catalyst preparation process and the difficulty in catalyst separation and reuse. question