Modified biopolymer fiber reinforced polylactic acid composite material and preparation method thereof

Abstract

The invention provides a modified biopolymer fiber reinforced polylactic acid composite material. Lactic acid is utilized to carried out graft modification on biopolymer fiber by virtue of esterification, so as to obtain modified biopolymer fiber, then the modified biopolymer fiber and polylactic acid are taken as raw materials, banburying is carried out, so as to obtain homogeneous mixture of modified biopolymer fiber and polylactic acid, and then the obtained homogeneous mixture of modified biopolymer fiber and polylactic acid is subject to hot forming in a hot press, and finally cooling and solidifying are carried out, thus obtaining the composite material. The preparation method of the invention has simple operation and high production efficiency, interface combination among components of the prepared composite material is good, the composite material of the invention are greatly improved in mechanical properties and thermal properties compared with polylactic acid, and cost of material is greatly reduced. The composite material of the invention remains good biodegradability and biocompatibility of polylactic acid and can be used for preparing novel environmentally friendly engineering plastics and fracture internal fixation tissue engineering material.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a modified biomass fiber reinforced polylactic acid composite material and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the development of society, the problems of resource shortage and environmental pollution have become increasingly prominent, and have become global issues of widespread concern. Polylactic acid is a renewable biodegradable material with good biocompatibility. Because of its non-toxic, degradable and renewable characteristics, it meets the requirements of environmental protection and sustainable development, so it is more and more popular among material researchers. and the attention of business people. However, as an engineering plastic application, polylactic acid has disadvantages such as insufficient strength, low flexibility, high glass transition temperature, and hig...

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Problems solved by technology

The invention patent with the publication number of 101570624 discloses a preparation method of a biomass-based polylactic acid composite material. The composite material is composed of polylactic acid, wood powder, toughening agent, coupling agent and other additives. Hardness and toughness, but the tensile strength is not significantly improved compared with polylactic acid, and the content of non-degradable petrochemical-based tougheners in the material is high, which affects the biodegradability of the material and increases the cost of the material

In addition, invention patents with publication numbers 1488673, 101177523, and 101781448A respectively describe the preparation of chitosan, plant fiber, starch and other biomass fibers and polylactic acid composite materials, but the interfacial bonding between biomass fibers and polylactic acid has not been solved. A better solution can only improve the mechanical strength of the material to a certain extent, but cannot greatly improve its flexibility at the same time, and cannot meet the needs of relevant parties.

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