Low-warpage low-density glass fiber reinforced polylactic acid composite material and preparation method thereof

• Main Authors: FAN HAIBIN, ZHANG KEWEI, SUN ZHOUYU
• Format: Patent
• Language: Chinese; English
• Published: 18.05.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The invention relates to a low-warpage low-density glass fiber reinforced polylactic acid composite material and a preparation method thereof. The preparation method comprises the following steps: taking the following raw materials: 40.9-79.1% of polylactic acid, 10-30% of flat glass fiber, 5-10% of hollow glass beads, 5-15% of a flexibilizer, 0.1-0.3% of a nucleating agent, 0.2-0.8% of a lubricant, 0.1-1% of an auxiliary agent and 0.5-2% of a coloring agent; putting the dried polylactic acid, the toughening agent, the nucleating agent, the lubricant, the auxiliary agent and the coloring agent into a high-speed mixer, and stirring; and putting the obtained mixture into a twin-screw extruder, laterally feeding the flat glass fibers at the fifth section of the twin-screw extruder, laterally feeding the hollow glass beads at the eighth section of the twin-screw extruder, extruding by the twin-screw extruder, cooling, and granulating to obtain a finished product. The composite material has ideal heat resistance,