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Bamboo fiber/polylactic acid composite material and preparation method thereof

A composite material and bamboo fiber technology, which is applied in the field of bamboo fiber/polylactic acid composite material and its preparation, can solve the problems of large waste gas pollution, low reaction efficiency, and high energy consumption, and achieve the effect of low equipment requirements and improved reaction efficiency

Active Publication Date: 2020-06-05
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, the in-situ polymerization of lactic acid grafted bamboo fibers is generally carried out through aqueous phase synthesis and organic solvent synthesis, which has problems such as low reaction efficiency, high energy consumption, and large waste water and exhaust gas pollution.

Method used

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  • Bamboo fiber/polylactic acid composite material and preparation method thereof
  • Bamboo fiber/polylactic acid composite material and preparation method thereof
  • Bamboo fiber/polylactic acid composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of modified bamboo fiber / polylactic acid composite material of the present invention is prepared by the following method:

[0031] (1) Disperse 0.1 parts by weight of catalyst (the catalyst is stannous octoate) in 10 parts by weight of lactic acid monomer to obtain a dispersion. Add 100 parts by weight of bamboo fibers to the dispersion liquid, and stir evenly to obtain a mixture.

[0032] (2) Put the mixture in the step (1) in a hydrothermal reaction kettle, seal it; react at a temperature of 120° C. for 12 hours to obtain lactic acid grafted bamboo fiber.

[0033] (3) Mix 900 parts by weight of polylactic acid resin with the lactic acid grafted bamboo fiber obtained in step (2), add 120 parts by weight of plasticizer (glycerin), and place it in a sealed place at room temperature for 6 hours. A two-roller mixer was used for mixing, the mixing temperature was 150° C., and the mixing time was 10 minutes to obtain a mixed product.

[0034] (4) After the mixed pro...

Embodiment 2

[0041] A kind of modified bamboo fiber / polylactic acid composite material of the present invention is prepared by the following method:

[0042] (1) Disperse 2 parts by weight of the catalyst (the catalyst is stannous octoate) in 100 parts by weight of lactic acid monomer to obtain a dispersion. Add 100 parts by weight of bamboo fibers to the dispersion liquid, and stir evenly to obtain a mixture.

[0043] (2) Put the mixture in the step (1) in a hydrothermal reaction kettle, seal it; react at a temperature of 100°C for 8 hours to obtain lactic acid grafted bamboo fiber.

[0044] (3) 500 parts by weight polylactic acid resin is mixed with the lactic acid grafted bamboo fiber obtained in step (2), add 90 parts by weight of plasticizer (plasticizer comprises 45 parts by weight of citric acid ester and 45 parts by weight of formamide ), sealed at room temperature for 12h. A two-roller mixer was used for mixing, the mixing temperature was 160° C., and the mixing time was 15 minu...

Embodiment 3

[0051] A kind of modified bamboo fiber / polylactic acid composite material of the present invention is prepared by the following method:

[0052] (1) Disperse 4 parts by weight of catalyst (the catalyst is triethylaluminum) in 200 parts by weight of lactic acid monomer to obtain a dispersion. Add 100 parts by weight of bamboo fibers to the dispersion liquid, and stir evenly to obtain a mixture.

[0053] (2) Put the mixture in the step (1) in a hydrothermal reaction kettle, seal it; react at a temperature of 80°C for 3 hours to obtain lactic acid grafted bamboo fiber.

[0054] (3) Mix 100 parts by weight polylactic acid resin with the lactic acid grafted bamboo fiber obtained in step (2), add 18 parts by weight plasticizer (plasticizer comprises 6 parts by weight polyethylene glycol 400, 6 parts by weight Formamide and 6 parts by weight of citric acid ester), sealed at room temperature for 18h. A two-roller mixer was used for mixing, the mixing temperature was 180° C., and the...

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Abstract

The invention discloses a bamboo fiber / polylactic acid composite material and a preparation method thereof. The preparation method comprises the following steps: dispersing a catalyst in a lactic acidmonomer to obtain dispersion, and mixing the dispersion and bamboo fibers so as to obtain a mixture; adding the mixture into a hydrothermal reactor, and sealing; reacting at the temperature of 60-120DEG C for 1-12 hours so as to obtain lactic acid grafted bamboo fibers; mixing the lactic acid grafted bamboo fibers and polylactic resin, adding a plasticizer, and sealing; mixing at the temperatureof 150-180 DEG C for 10-20 minutes so as to obtain a mixed product; crushing the mixed product, and performing mold pressing, thereby obtaining the bamboo fiber / polylactic acid composite material. The preparation method disclosed by the invention is high in reaction efficiency, has low equipment requirement and is an environmental-friendly green polymerization process. The prepared bamboo fiber / polylactic acid composite material is high in tensile property, high in bending strength and excellent in water resistance.

Description

technical field [0001] The invention relates to the technical field of bamboo composite materials, in particular to a bamboo fiber / polylactic acid composite material and a preparation method thereof. Background technique [0002] Bamboo is extremely rich in resources and has a short growth cycle. Its research and utilization have attracted much attention. Various types of bamboo wood-based panels, bamboo activated carbon and bamboo fuel have been successfully developed. However, these traditional processing and utilization methods have extremely low utilization rate, high production energy consumption, serious pollution, single performance and low added value. In view of this, bamboo and polymer resin are combined to develop bamboo-plastic composite materials that can be used in packaging, construction, and even the bottom panels and interiors of automobiles, high-speed rails and aircrafts. This will not only increase the added value of bamboo products and expand its applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L97/02C08K5/053C08K5/11C08K5/20C08K5/06C08G63/08C08H8/00
Inventor 左迎峰吴义强李萍李新功刘文杰肖俊华何啸宇王驰徐冰杰屠茹茹刘卯丑
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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