Preparation method of polylactic acid-based nanocomposite film with high strength and barrier property

A high-barrier, nano-composite technology, applied in the field of composite film preparation, can solve the problem of carbon nanotubes being prone to agglomeration, solve the problem of interfacial compatibility, improve the barrier properties and mechanical properties, and have good flexibility.

Inactive Publication Date: 2019-10-11
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unique tubular structure of carbon nanotubes, it has a large aspect ratio and specific surface area, and has good mechanical properties, chemical stability, excellent electrical conductivity and thermal conductivity, but because of its structure, carbon nanotubes Very prone to reunion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of modifiers. Prepare 40ml of ethanol solution with a mass percentage of 80%, adjust the pH to 4 with glacial acetic acid, slowly add it dropwise to 60ml of KH-550 (silane coupling agent) after ultrasonic oscillation for 10 minutes, mix and stir for 4 hours to obtain the modifier Solution A.

[0022] (2) Silanization modification of nanofibrillated cellulose. Prepare 100ml of ethanol solution with a mass percentage of 80% and add it to 100ml of 1.4% nanofibrillated cellulose by ultrasonic dispersion for 5 minutes to obtain a suspension B of nanofibrillated cellulose; subsequently, take a certain amount of The obtained solution A was mixed with the suspension B and then ultrasonically dispersed for 10 minutes, and the pH of the mixture was adjusted to about 4 with glacial acetic acid, and then moved to a constant temperature water bath at 65°C to stir for 4 hours, and finally the mixture was centrifuged with ethanol for 6- 8 times to obtain silanized mo...

Embodiment 2

[0026] (1) Preparation of modifiers. Prepare 40ml of ethanol solution with a mass percentage of 80%, adjust the pH to 4 with glacial acetic acid, slowly add it dropwise to 60ml of KH-550 (silane coupling agent) after ultrasonic oscillation for 10 minutes, mix and stir for 4 hours to obtain the modifier Solution A.

[0027] (2) Silanization modification of nanofibrillated cellulose. Prepare 100ml of ethanol solution with a mass percentage of 80% and add it to 100ml of 1.4% nanofibrillated cellulose by ultrasonic dispersion for 5 minutes to obtain a suspension B of nanofibrillated cellulose; subsequently, take a certain amount of The obtained solution A was mixed with the suspension B and then ultrasonically dispersed for 10 minutes, and the pH of the mixture was adjusted to about 4 with glacial acetic acid, and then moved to a constant temperature water bath at 65°C to stir for 4 hours, and finally the mixture was centrifuged with ethanol for 6- 8 times to obtain silanized mo...

Embodiment 3

[0031] (1) Preparation of modifiers. Prepare 40ml of ethanol solution with a mass percentage of 80%, adjust the pH to 4 with glacial acetic acid, slowly add it dropwise to 60ml of KH-550 (silane coupling agent) after ultrasonic oscillation for 10 minutes, mix and stir for 4 hours to obtain the modifier Solution A.

[0032] (2) Silanization modification of nanofibrillated cellulose. Prepare 100ml of ethanol solution with a mass percentage of 80% and add it to 100ml of 1.4% nanofibrillated cellulose by ultrasonic dispersion for 5 minutes to obtain a suspension B of nanofibrillated cellulose; subsequently, take a certain amount of The obtained solution A was mixed with the suspension B and then ultrasonically dispersed for 10 minutes, and the pH of the mixture was adjusted to about 4 with glacial acetic acid, and then moved to a constant temperature water bath at 65°C to stir for 4 hours, and finally the mixture was centrifuged with ethanol for 6- 8 times to obtain silanized mo...

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Abstract

The invention relates to a preparation method of a polylactic acid-based nanocomposite film with high strength and barrier property. The raw materials of the composite film comprise polylactic acid, carbon nanotubes, a KH-550 silane coupling agent, nanofibrillated cellulose and ethanol. The polylactic acid-based nano composite film with high strength and barrier property is obtained through the preparation of a silane modifier, silanization modification of the nanofibrillated cellulose and solution casting and shaping of the polylactic acid-based nanocomposite film. The polylactic acid-based nanocomposite film has wide sources of raw materials and a simple preparation process, the production cost can be effectively reduced, and economic benefits can be effectively increased. More importantly, the agglomeration effect is improved after the modification of the carbon nanotubes and coating of the nanofibrillated cellulose, the interfacial compatibility between the polylactic acid, the carbon nanotubes and the nanofibrillated cellulose is better improved, and correspondingly the enhancement effect of the carbon nanotubes and the nanofibrillated cellulose on the polylactic acid is improved. Not only is the mechanical performance of the polylactic acid-based nanocomposite film improved significantly, but also the barrier property is greatly enhanced.

Description

technical field [0001] The invention relates to the field of preparation of composite films, in particular to a preparation method of high-strength and high-barrier polylactic acid-based nano-composite films. Background technique [0002] As one of the most valuable biodegradable polymers for development and application, polylactic acid is mainly derived from natural renewable plant resources, such as the fermentation of corn starch and beet sugar. Polylactic acid can be hydrolyzed or completely degraded by microorganisms in the natural environment, and finally becomes carbon dioxide and water. Polylactic acid is linearly polymerized, with almost no side chain active groups, elongation at break ≤ 10%, and its glass transition temperature (Tg) is only 55°C. Low strength, poor impact resistance, etc.; and nanoparticles can well make up for the shortcomings of polylactic acid with its unique size effect, high aspect ratio, excellent mechanical properties and heat resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/08C08K3/04C08J5/18C08B15/05C08J3/215
CPCC08B15/05C08J3/215C08J5/18C08J2367/04C08J2401/08C08K2201/011C08K3/041
Inventor 唐艳军金凯妍
Owner ZHEJIANG SCI-TECH UNIV
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