Method for preparing polyether polyol by hydrothermal catalytic degradation of waste hard polyurethane material

Abstract

The invention provides a method for preparing polyether polyol by hydrothermal catalytic degradation of a waste hard polyurethane material. The method comprises the following steps: (1) adding waste hard polyurethane into a crusher for crushing the waste hard polyurethane to obtain hard polyurethane powder; (2) adding the hard polyurethane powder into a reaction kettle, and adding a certain amountof liquefying agent and depolymerization catalyst, wherein the mass ratio of the liquefying agent to the hard polyurethane is 1-4: 1, and the depolymerization catalyst accounts for 0.8-3.5% of the total mass of the hard polyurethane; and (3) heating to the temperature of 180-240 DEG C, reacting for 2-12 h, cooling the product to the room temperature after the reaction is finished, and filtering to obtain liquefied polyether polyol. According to the method, the polyether polyol is prepared by catalytic degradation of a catalytic solvothermal technology, the process is simple, the conversion rate is high, and the method is a green way for high-quality utilization of waste polyurethane; the used catalyst does not need to be recycled, remains in the reaction product, and is used as a catalystfor further synthesizing the polyurethane material; and used equipment and operation are simple, the depolymerization rate of the waste polyurethane is high, and the yield of the polyether polyol product is high.

Description

technical field [0001] The invention relates to the technical field of utilization of renewable resources, in particular to a method for preparing polyether polyols through hydrothermal catalytic degradation of waste rigid polyurethane materials. Background technique [0002] With the increasing popularity of polyurethane materials and products in industrial production, national defense and daily life, they are widely used in automobile manufacturing, refrigerator manufacturing, transportation, civil engineering, footwear, synthetic leather, fabrics, electromechanical, mining machinery, petrochemical , aerospace, medical, agriculture and many other fields. Polyurethane has become one of the bulk polymer materials (the market consumption of polyurethane products in my country was 13 million tons in 2108), and how to deal with the resulting waste polyurethane has attracted worldwide attention. It has become one of the key issues in the field of resource utilization of polymer...

AI Technical Summary

Problems solved by technology

The quality of the polyether polyol obtained by this method is close to that of the original polyether polyol, which can be directly used in the production of polyurethane foam, but the process route is longer and the cost is higher

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