Polyurethane foam spraying, foaming and forming method

• Main Authors: ZHAO YIQIU, TONG QIANG, NING MENGCHUAN, LI JINGYU, YAN HONGYING, WU BIN, YUAN XUANMIN, YANG LIUWEI
• Format: Patent
• Language: Chinese; English
• Published: 11.01.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

The invention discloses a polyurethane foam spraying, foaming and forming method. The method comprises the following steps: 1, weighing materials according to a ratio, putting the materials into a batching kettle, uniformly stirring at room temperature, opening the batching kettle, heating to a use temperature in an oil bath, and preparing a white material; and 2, mixing the white material with polymethylene polyphenyl isocyanate PAPI, and spraying the mixture on the surface of a workpiece to form a foam structure. The foam structure with low density, high hardness, high compression strength, good dimensional stability and good temperature resistance is obtained by controlling the composition of the white material and carrying out spraying foaming molding, so that the requirements of the foam structure on high rigidity and good dimensional stability are met, and the foam material is suitable for workpieces with complex structures and more irregular parts with concave-convex surfaces, the forming efficiency is