Waterborne polyurethane resin with ultrahigh solid content and preparation method of same

• Main Authors: GUO WENHE, WANG FEI, ZHU BAOLING, ZHAO XI, LI WEIHU, DAI JIABING
• Format: Patent
• Language: Chinese; English
• Published: 10.11.2020
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

The invention provides a preparation method of waterborne polyurethane resin with ultrahigh solid content. The preparation method comprises the following steps: providing a waterborne polyurethane prepolymer; emulsifying the waterborne polyurethane prepolymer with the first waterborne polyurethane resin, wherein the first waterborne polyurethane resin and the waterborne polyurethane prepolymer donot have reactivity, the solid content of the first waterborne polyurethane resin is 10%-40%, and the pH value of the first waterborne polyurethane resin is 6-8; carrying out chain extension on the emulsified waterborne polyurethane prepolymer by using a polyamine aqueous solution to obtain a reaction emulsion; carrying out aftertreatment on the reaction emulsion so as to prepare second waterbornepolyurethane resin with the ultrahigh solid content, wherein the solid content of the second waterborne polyurethane resin is 50%-65%, and the pH value of the second waterborne polyurethane resin is6-8. 本发明提供一种超高固含水性聚氨酯树脂的制备方