Modified polylactic acid preparation method and modified polylactic acid preparation device

• Main Authors: SHI YIWANG, ZHAO JIANJUN, TAI YANFANG, WU JINGMEI
• Format: Patent
• Language: Chinese; English
• Published: 01.12.2017
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; 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 discloses a modified polylactic acid preparation method. The method includes: adding an appropriate amount of L-lactic acid into a container I, dehydrating, and sequentially adding dehydrated L-lactic acid and 1,4-butanediol into a container II to obtain a product A through reaction under the catalytic reaction of stannous chloride; adding the product A and 2,4-toluene diisocynate into a container III; feeding N2 into the container III to obtain a product B; dissolving with chloroform, and adding methyl alcohol to obtain a precipitate; sequentially adding chitosan and 50% NaOH solution into a container IV to obtain a product C through reaction; adding the product C and solution A into the container IV, continuously stirring for reaction for 1-5h at 90 DEG C, adopting diethyl ether for precipitating a product D obtained in reaction, and drying solid obtained by precipitating for 10h under a vacuum condition to obtain modified polylactic acid. The modified polylactic acid preparation method has ad