Natural fiber/thermosetting polylactic acid composite material and preparation method thereof

A natural fiber and composite material technology, applied in the field of natural fiber/thermosetting polylactic acid composite material and its preparation, can solve the problem of little improvement in brittleness, avoid phase separation, improve long-term stability, and improve toughness and mechanical properties. Effect

Inactive Publication Date: 2013-05-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat resistance of this thermosetting polylactic acid has been greatly improved, but its brittleness has not been greatly improved, and it is still not suitable for engineering plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Soak ramie fibers with an aspect ratio of 15 in an aqueous sodium hydroxide solution with a concentration of 8wt% for 2 hours, wash with water until neutral, dry in air, and then vacuum-dry to obtain surface-modified short ramie fibers;

[0033] (2) Add surface-modified short ramie fibers with a mass fraction of 30wt% to the end-group modified star-shaped polylactic acid melt, and stir at 100°C for 20 minutes to obtain a uniformly dispersed composite resin melt;

[0034] (3) Pour the composite resin melt obtained in step (2) into a mold, irradiate a dose of 90kGy with a cobalt source, and obtain a ramie fiber / thermosetting polylactic acid composite material after curing. Mechanical properties: tensile strength 90MPa, impact strength 9.74KJ m -2 ; Thermal stability: The sample can maintain its original shape without deformation at 200 °C.

Embodiment 2

[0036] (1) Soak jute fibers with an aspect ratio of 5 in a 0.2wt% silane coupling agent KH550 aqueous solution for 3 hours, wash with water, dry in air, and then vacuum-dry to obtain surface silane-modified jute fibers;

[0037] (2) Add 20wt% surface silane-modified jute fiber and 1wt% cumene hydroperoxide to the terminal-modified star-shaped polylactic acid melt, and stir at 80°C for 15 minutes , to obtain a uniformly dispersed composite resin melt;

[0038] (3) The composite resin melt obtained in step (2) was poured into a mold, kept at 160°C for 2 hours, and finally cured at 200°C for 1 hour to obtain a jute fiber / thermosetting polylactic acid composite material. Mechanical properties: tensile strength 67MPa, impact strength 13.65KJ m -2; Thermal stability: The sample can maintain its original shape without deformation at 200 °C.

Embodiment 3

[0040] (1) Soak bamboo fibers with an aspect ratio of 20 in a silane coupling agent KH560 aqueous solution with a concentration of 0.4wt% for 2 hours, wash with water, dry in the air, and then vacuum-dry to obtain surface silane-modified bamboo fibers;

[0041] (2) Add the surface silane-modified bamboo fiber with a mass fraction of 25wt% to the end-group modified star-shaped polylactic acid melt, and stir at 110°C for 10 minutes to obtain a uniformly dispersed composite resin melt;

[0042] (3) Pour the composite resin melt obtained in step (2) into a mold, irradiate a dose of 60kGy with a cobalt source, and obtain a bamboo fiber / thermosetting polylactic acid composite material after curing. Mechanical properties: tensile strength 87MPa, impact strength 11.78KJ m -2 ; Thermal stability: The sample can maintain its original shape without deformation at 200 °C.

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Abstract

The invention belongs to the technical field of a high molecular material and particularly relates to a natural fiber / thermosetting polylactic acid composite material and a preparation method thereof. The material is formed by natural fibers and thermosetting polylactic acid. The specific preparation method comprises the following steps of: carrying out surface treatment on the natural fibers and uniformly dispersing into a star-shaped polylactic acid melt modified by an unsaturated anhydride terminal group; and initiating a polymerization reaction by radiation or thermally initiating the polymerization reaction by a free radical initiator to carry out cross-linking and curing to obtain the natural fiber / thermosetting polylactic acid composite material. Compared with the pure polylactic acid, the mechanical property and the heat stability of the composite material are greatly improved; and the composite material can be used for preparing engineering plastic with demanding requirements. After being abandoned, the composite material disclosed by the invention can be completely degraded in a natural environment, belongs to an environment-friendly material and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a natural fiber / thermosetting polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a completely biodegradable and environmentally friendly aliphatic polyester polymer material derived from renewable resources. After use, it can be completely degraded by microorganisms in nature, does not pollute the environment, and has good The advantages of excellent mechanical properties and easy processing make it the most widely used biodegradable polymer material. 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, the shortcomings of polylactic acid, such as brittleness, poor toughness, and low heat distortion temperature, limit its application in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/02C08J3/24C08J5/06
Inventor 李建波任杰陈勰孙旻丰丁峰
Owner TONGJI UNIV
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