Corncob Powder/Polylactic Acid Composite Material and Preparation Method Therefor

• Main Authors: Han, Rui, Wang, Xiaorong, Chen, Gang, Wang, Zhongzui, Li, Guangzhao, Zheng, Lang, Gao, Xiaoyan, He, Taibi
• Format: Patent
• Language: English
• Published: 09.09.2021
• 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 present application relates to the field of composite materials, in particular to a corncob powder/polylactic acid composite material and a preparation method therefor. The method comprises the following steps: modifying polylactic acid by a polyanhydride or polycarboxy compound with a benzene ring, a naphthalene ring or cyclopentane, so that a chain end group structure of a polylactic acid molecule is changed from a monohydroxy structure into a rigid ring molecular structure containing polycarboxy groups; treating corncob powder by an alkali liquor, and microwave blasting to expose polyhydroxyl cellulose of the corncob powder; and then hot-melt blending end-group modified polylactic acid with modified corncob powder, so as to remarkably promote chemical bonding between polylactic acid and the surface of the corncob powder by means of rigid polycarboxy functional groups at a chain end of polylactic acid and polyhydroxyl cellulose exposed on the corncob powder. The composite material prepared by the method of the present application has high interfacial strength, and the corncob powder is connected with each other by polylactic acid to form a cross-linked network, so that the composite material still shows good mechanical properties at high corncob powder filling rate. Therefore, the method of the present application can be widely applied to the field of environment-friendly plastic products.