Method for production of heat-insulating materials

摘要

The present invention relates to the method for production of heat-insulating material based on rigid polyurethane foam. The method makes possible to expand the raw materials base for production of heat-insulating materials without using components obtained from petroleum and vegetable oils. In the method for production of heat-insulating materials based on rigid polyurethane foam, by combination of isocyanate component with the polyol component, a complex formed by an industrial lignin non-soluble in organic solvents, which is oxypropylated, and then is combined with unmodified lignin in the course of the reaction in ratio from 7:1 to 2.3:1, is used as polyol component. Before being oxypropylated, unmodified lignin is previously oxidized by using POM/ H 2 O 2 (polyoxometalates/hydrogen peroxide) system. The object of the present invention is achieved also by that unmodified lignin before combining with oxypropylated lignin is activated in an impact-type disintegrator increasing the total content of hydroxyl group and availability thereof to chemical interaction. The object of the present invention is also achieved by that unmodified lignin before being combined with the main component of polyol system - oxypropylated lignin, is oxidized in POM/ H 2 O 2 system. Thus, lignin, which has not been utilized earlier for production of heat-insulating material based on rigid polyurethane foam, is used as one of the main raw materials, furthermore, the characteristics of the obtained material correspond to similar commercially available materials.