Preparation and application methods of lignin-based flame retardant

• Main Authors: ZHANG YUMEI, NI CHUANGJIANG, HU WEI, YAN RU, ZHANG MINGYAO, HAN SHUANG, ZHAO QI
• Format: Patent
• Language: Chinese; English
• Published: 13.10.2017
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

The invention provides preparation and application methods of a lignin-based flame retardant, and relates to a flame retardant. The flame retardant is prepared from the following raw materials: lignin, isocyanate, 9,10-dihydro-9-oxa-phenanthrene-10-oxide (DOPO). The preparation method specifically comprises the following steps: performing reaction on the lignin and the isocyanate at certain temperature; performing reaction with the DOPO at certain temperature; finally, drying the obtained product in a vacuum drying box, and smashing the product, thus obtaining the flame retardant. According to the flame retardant, hydroxyl on the lignin is reacted with the isocyanate; meanwhile, with a phosphate structure, the flame retardant has a good flame retarding effect; benzene ring structures contained in the lignin and the DOPO can enhance the mechanical property of the material. The invention further provides a preparation method of flame retarding polyurethane. The method comprises the steps of performing reaction