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A kind of preparation method of polylactic acid/nanometer cellulose composite material

A nanocellulose and composite material technology is applied in the field of preparation of polylactic acid/nanocellulose composite materials to achieve the effects of solving the problem of uniform dispersion, improving interfacial adhesion and good application prospects

Inactive Publication Date: 2015-08-26
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of polylactic acid / nanocellulose composite material. The homogeneous dispersion problem in the compound, the obtained composite material is green and degradable, has no environmental burden, has broad application prospects, and is suitable for promotion

Method used

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  • A kind of preparation method of polylactic acid/nanometer cellulose composite material

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Embodiment 1

[0018] A kind of preparation method of polylactic acid / nanocellulose composite material, described polylactic acid / nanocellulose composite material comprises each component of following percentage by weight: polylactic acid 84%, nanocellulose 6%, polyethylene glycol 10% , the preparation method comprises the following steps:

[0019] (1) Preparation of nanocellulose suspension by acid hydrolysis: Prepare an aqueous solution of microcrystalline cellulose (5 g of microcrystalline cellulose) with a mass percentage of 10%, and then add it dropwise to the aqueous solution of microcrystalline cellulose while stirring in an ice-water bath Concentrated sulfuric acid until the concentration of sulfuric acid reaches 50%, stir and react at 40°C for 1.5h, centrifuge the resulting suspension at 12000rpm for 10min, remove the supernatant, repeat five times, and ultrasonicate the centrifuged sample 3 times in an ice-water bath, each time Sonicate for 10 minutes, and then adjust the pH value ...

Embodiment 2

[0023] A preparation method of polylactic acid / nanocellulose composite material, said polylactic acid / nanocellulose composite material comprises the following components in weight percentage: polylactic acid 88%, nanocellulose 2%, polyethylene glycol 10% , the preparation method comprises the following steps:

[0024] (1) Preparation of nanocellulose suspension by acid hydrolysis: Prepare an aqueous solution of microcrystalline cellulose (5 g of microcrystalline cellulose) with a mass percentage of 10%, and then add it dropwise to the aqueous solution of microcrystalline cellulose while stirring in an ice-water bath Concentrated sulfuric acid until the concentration of sulfuric acid reaches 50%, stir and react at 40°C for 1.5h, centrifuge the resulting suspension at 12000rpm for 10min, remove the supernatant, repeat five times, and ultrasonicate the centrifuged sample 3 times in an ice-water bath, each time Sonicate for 10 minutes, and then adjust the pH value to neutral with ...

Embodiment 3

[0028] A kind of preparation method of polylactic acid / nanocellulose composite material, described polylactic acid / nanocellulose composite material comprises each component of following percentage by weight: polylactic acid 88%, nanocellulose 6%, polyethylene glycol 6% , the preparation method comprises the following steps:

[0029] (1) Preparation of nanocellulose suspension by acid hydrolysis: Prepare an aqueous solution of microcrystalline cellulose (10 g of microcrystalline cellulose) with a mass percentage of 10%, and then add it dropwise to the aqueous solution of microcrystalline cellulose while stirring in an ice-water bath Concentrated sulfuric acid until the concentration of sulfuric acid reaches 50%, stir and react at 40°C for 1.5h, centrifuge the resulting suspension at 12000rpm for 10min, remove the supernatant, repeat five times, and ultrasonicate the centrifuged sample 3 times in an ice-water bath, each time Sonicate for 10 minutes, and then adjust the pH value ...

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Abstract

The invention provides a preparation method of a polylactic acid / nano cellulose composite material. The composite material comprises the following components in percentage by weight: 55 to 99.8% of polylactic acid, 0.1 to 15% of nano cellulose, and 0.1 to 30% of polyethylene glycol. The method comprises the following steps of: preparing a 5 to 15% an aqueous solution of microcrystalline cellulose, dripping concentrated sulfuric acid until the concentration of sulfuric acid reaches 40 to 60%, stirring and reacting for 1 to 2hours, carrying out centrifugation, ultrasound treatment and adjusting pH value to be neutral to obtain a nano cellulose suspension; dissolving polyethylene glycol, mixing with the nano cellulose suspension, stirring for 1 to 3hours at the temperature of 90 DEG C and carrying out vacuum drying to obtain a polyethylene glycol / nano cellulose comixture; and carrying out melt blending on the polyethylene glycol / nano cellulose comixture and polylactic acid for 5 to 8minutes at the temperature of 120 to 170 DEG C to obtain the composite material. The method is convenient and simple to operate, short in the time of the preparation process and solves the problem of uniform dispersion of nano-cellulose in the polylactic acid.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a preparation method of a polylactic acid / nanocellulose composite material. Background technique [0002] The "white pollution" caused by traditional petroleum-based materials due to their non-degradability has threatened the ecological environment, and petroleum is a non-renewable resource. Therefore, biodegradable polymers based on natural renewable resources have received more and more attention and become a future development trend. Polylactic acid is favored for its good biocompatibility, thermoplasticity and biodegradability. However, pure polylactic acid materials are hard, brittle, poor in impact strength, low in heat distortion temperature, and have few reactive functional groups and are not hydrophilic, resulting in slow degradation of polylactic acid. This has prompted people to modify polylactic acid to improve its performance and application range. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L1/02C08L71/08
Inventor 张萍高德邹萍萍林梦霞
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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