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

A biomass fiber and composite material technology, which is applied in the field of composite materials, can solve the problems that the interface between biomass fiber and polylactic acid has not been well resolved, the flexibility cannot be greatly improved at the same time, and the tensile strength has not been significantly improved. , to achieve the effect of maintaining full degradability, excellent mechanical properties, and easy control of reaction conditions

Inactive Publication Date: 2011-01-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Effect test

Embodiment 1

[0054] Embodiment 1 Preparation of modified microcrystalline cellulose reinforced polylactic acid composite (g-MC / PLA)

[0055] The preparation of modified microcrystalline cellulose reinforced polylactic acid composite (g-MC / PLA) is carried out in the following steps:

[0056] (1) Preparation of modified microcrystalline cellulose (g-MC):

[0057] Put dehydrated L-lactic acid and dry microcrystalline cellulose (MC) in the reactor at a weight ratio of 5:1, raise the temperature to 60°C and stir and mix evenly, then press dehydrated L-lactic acid and dried microcrystalline cellulose (MC) 0.3% of the total weight of stannous chloride was added as a catalyst, and the reaction was stirred for 4 hours; then the temperature was raised to 100° C., and the reaction was continued for 4 hours; finally, the temperature was raised to 150° C., and the reaction was stopped for 4 hours, and the reaction was stopped to obtain crude modified microcrystalline cellulose. The vacuum degree of th...

Embodiment 2

[0061] Embodiment 2 Preparation of modified starch reinforced polylactic acid composite material

[0062] The preparation of modified starch reinforced polylactic acid composite material is carried out in the following steps:

[0063](1) Preparation of modified starch: put dehydrated L-lactic acid and dried cornstarch in a reaction bottle at a weight ratio of 5:1, heat up to 65°C and mix evenly, then press dehydrated L-lactic acid and dried cornstarch 0.5% of the total weight of crystalline cellulose (MC) was added with stannous chloride as a catalyst, and stirred for 3 hours; then the temperature was raised to 100° C., and the reaction was continued for 4 hours; finally, the temperature was raised to 150° C., and the reaction was stopped for 4 hours, and the reaction was stopped to obtain crude modified starch . The vacuum degree of the system is maintained at -0.09~-0.1MPa throughout the reaction process. The crude modified starch was taken out, washed 3 times with absolut...

Embodiment 3

[0066] Embodiment 3 Preparation of modified microcrystalline cellulose reinforced polylactic acid composite material (g-MC / PLA)

[0067] Based on Example 1, the difference is that the input weight ratio of L-lactic acid and microcrystalline cellulose in step (1) is changed to 8:1, and the others are the same as in Example 1. In this example, a modified microcrystalline cellulose reinforced polylactic acid composite material (g-MC / PLA) was obtained.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/08C08L97/02C08L5/08C08L3/04C08B15/00C08H6/00C08B37/08C08B31/00B29C43/58C08H7/00
Inventor 杨光肖林余龙江
Owner HUAZHONG UNIV OF SCI & TECH
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