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Natural fibre reinforced polylactic acid composite material and method for making same

A natural fiber and composite material technology, applied in the field of natural fiber reinforced polylactic acid composite material and its preparation, can solve the problems of poor bonding between fiber and resin, incomplete degradation, and affecting the performance of composite materials, and achieve excellent biodegradability , improved mechanical properties and thermal properties, and the effect of meeting environmental protection requirements

Active Publication Date: 2008-06-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In China, Sun Yat-sen University, National University of Defense Technology and other institutions have also carried out research on the compounding of natural plant fiber, unsaturated resin and polyurethane. Although some breakthroughs have been made in the mechanical properties and heat resistance of materials, the biggest disadvantage is It cannot be completely degraded
Kobe Steel Co., Ltd.’s patent 01109452.4 in 2001 mentioned that natural fibers were used as reinforcing fibers, and fiber-reinforced thermoplastic resin sheets were prepared by dipping extrusion method. The disadvantage of this method is that the degree of bonding between fibers and resins is not good, so that affect the properties of the composite

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Polylactic acid and ramie fibers with an aspect ratio of 15 were vacuum-dried at 45° C. for 10 hours to remove moisture.

[0033] 2. Mix polylactic acid, maleic anhydride and benzoyl peroxide evenly according to a certain ratio, and then react in a twin-screw extruder. The product is cooled, pelletized, and dried. Wherein the addition of maleic anhydride is 3wt%, the addition of benzoyl peroxide is 4wt%, the screw speed is 50rpm, and the reaction extrusion temperature is 150°C.

[0034] 3. The modified polylactic acid obtained in step 2 and the ramie fiber in step 1 are successively added in a twin-screw extruder for composite processing, wherein the weight ratio of polylactic acid and ramie fiber is 1: 9, and the screw speed is 50~250rpm , the extrusion temperature is 150°C. A ramie fiber / polylactic acid composite material was obtained.

Embodiment 2

[0036] 1. Polylactic acid and jute fibers with an aspect ratio of 5 were vacuum-dried at 30°C for 1 hour to remove moisture.

[0037] 2. Mix polylactic acid, maleic anhydride and initiator di(2,4-dichlorobenzoyl) peroxide evenly according to a certain ratio, then react in a twin-screw extruder, and the product is cooled and pelletized ,drying. Wherein the addition amount of maleic anhydride is 0.1wt%, the addition amount of di(2,4-dichlorobenzoyl) peroxide is 0.1wt%, the screw speed is 10rpm, and the reaction extrusion temperature is 150°C.

[0038] 3. the modified polylactic acid that step 2 obtains and the jute fiber in step 1 add successively in twin-screw extruder and carry out composite processing, wherein the weight ratio of polylactic acid and jute fiber is 2: 9, and screw speed is 50rpm, extrudes The output temperature is 150°C, and the jute fiber / polylactic acid composite material is obtained.

Embodiment 3

[0040] 1. PLA and flax fibers with an aspect ratio of 100 were vacuum-dried at 120°C for 24 hours to remove moisture.

[0041] 2. Mix polylactic acid, maleic anhydride and initiator diacetyl peroxide uniformly according to a certain ratio, and then react in a twin-screw extruder, and the product is cooled, pelletized, and dried. Wherein the addition of maleic anhydride is 10wt%, the addition of initiator is 2wt%, the screw speed is 250rpm, and the reaction extrusion temperature is 200°C.

[0042] 3. The modified polylactic acid obtained in step 2 and the flax fiber in step 1 are successively added into a twin-screw extruder for composite processing, wherein the weight ratio of polylactic acid and flax fiber is 9: 1, and the screw speed is 250rpm. The output temperature is 180°C, and the flax fiber / polylactic acid composite material is obtained.

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Abstract

The present invention belongs to the macromolecular material technical field and concretely relates to natural fibre enhanced polylactic acid composite material and a preparation method thereof. The composite material consists of graft modified polylactic acid and the natural fibre. A concrete preparation step is that a polylactic acid matrix is processed for the graft modification, so as to improve the interface combined degree of the natural fibre and the polylactic acid matrix. Firstly, the polylactic acid is processed for the graft reaction with maleic anhydride under the action of an initiator to prepare the graft modified polylactic acid matrix; then the modified polylactic acid and the natural fibre are compounded to obtain biological full-degraded natural fibre enhanced polylactic acid composite material. Compared with pure polylactic acid, the mechanical performance and the thermal performance of the composite material are all improved, and the composite material can be used for preparing the project plastic with rigorous condition requirement. The composite material of the present invention can be degraded completely in the natural environment after being used and wasted and belongs to environmental friendly material.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a natural fiber reinforced polylactic acid composite material and a preparation method thereof. Background technique [0002] At present, the application of biodegradable polymer materials in biomedicine and environment is becoming more and more important. Among them, polylactic acid (PLA) has become the most widely used biodegradable polymer material due to its degradability, good biocompatibility, good mechanical properties and molding processability. Polylactic acid plastics, fibers or films are used in industry, agriculture and daily life, which can solve the problem of "white pollution" and meet the requirements of environmental protection. However, PLA is hard, has poor toughness, lacks flexibility and elasticity, and is easily bent and deformed; the degree of crystallinity is high, and the degradation rate is not easy to control. It does not contain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J5/10C08K5/14B29C47/40B29C48/40
CPCB29C48/40
Inventor 任杰于涛杨铭任天斌顾书英
Owner TONGJI UNIV
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