75results about How to "Raw materials are renewable" patented technology

The invention discloses epoxy-terminated waterborne polyurethane resin and a preparation method thereof. The resin is prepared in the following steps that vegetable oil polyhydric alcohols, small molecular polyhydric alcohols, diisocyanate and a hydrophilic chain-extending agent are contained in organic solvent, and an isocyanate-terminated polyurethane prepolymer is obtained through an addition reaction under the action of a catalyst; a hydroxyl-terminated epoxy compound is added for reacting, and epoxy-terminated polyurethane is obtained; then amine is added for neutralizing, water is dripped for conducting phase reversal, heat preservation is performed, the organic solvent is removed through reduced pressure distillation, and accordingly the epoxy-terminated waterborne polyurethane resin is obtained. The resin is water-based paint, no volatile organic pollutants exist, and environmental friendliness is achieved. The epoxy-terminated waterborne polyurethane resin is prepared from combining the polyurethane and the epoxy resin through a chemical method, and the resin not only has the flexibility of the polyurethane but also has the advantages of rigidity and cohesiveness of the epoxy resin. The vegetable oil polyhydric alcohols are adopted as the raw materials, and the method has advantages of being low in price, environmentally friendly, capable of regenerating raw materials and the like compared with a traditional mode that a petrochemical engineering dihydric alcohol product is used as the raw material.

The invention relates to a preparation method for tung oil polyhydric alcohol with high hydroxyl value. The method comprises the following steps: (1) mixing tung oil, carboxylic acid, an acid catalyst, a hydroxylation reagent and deionized water, heating to 35-45 DEG C, dropwise adding a hydrogen peroxide solution while stirring while maintaining the temperature at 40-65 DEG C, and maintaining the reaction temperature for 2-8h after the ending of the dropwise adding, standing for layering after the ending of the reaction, and separating a water phase, thereby acquiring an oil phase; (2) mixing the oil phase with hydroxy-containing amine agents, adding ethyl alcohol and an inorganic acid catalyst, heating to 30-40 DEG C under nitrogen protection, dropwise adding an aldehyde agent while stirring, heating to 50-90 DEG C while violently stirring and continuously reacting for 1-5h after the ending of the dropwise adding, standing for layering after the ending of the reaction, neutralizing the oil phase, washing with water and performing reduced pressure distillation, thereby acquiring the tung oil polyhydric alcohol with high hydroxyl value. According to the invention, the hydroxylation agent is added in the epoxidation process, so that a cross-linking side reaction can be effectively avoided, a tung oil conjugated triene bond after loop opening is replaced, the cross-linking can be effectively avoided in the amine methylation process and the tung oil polyhydric alcohol with high hydroxyl value is acquired.