Biodegradable polylactic acid-starch flame retardant composite material and preparation method thereof

• Main Authors: HU SHAN, ZHANG JUN, SHEN YINGJUN, GAO HULIANG, HUANG YUJIE
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2014
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED 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; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention relates to a biodegradable polylactic acid-starch flame retardant composite material and a preparation method of the composite material. The composite material comprises the following components in parts by weight: 40-60 of polylactic acid, 25-40 of modified starch, 10-13 of a flame retardant, 0.5-1 of an antioxidant, 4-5 of a plasticizer, and 0.5-1 of a flame retardant synergist. The preparation method is as follows: mixing the raw materials in a high-speed mixer for 5-10min according to the formula; then extruding and pelleting by a double screw extruder, wherein the extrusion temperature is 135-155 DEG C and the screw rotation speed is 200-300r/min; and performing injection molding on the dried polylactic acid-starch flame retardant aggregates by a injection molding machine to obtain the biodegradable polylactic acid-starch flame retardant composite material. According to the invention, the prepared biodegradable polylactic acid-starch flame retardant composite material is good in biodegradab