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Preparation method of polylactic acid/modified nanocellulose composite barrier material

A technology of nano-cellulose and barrier materials, which is applied in the field of preparation of polylactic acid/modified nano-cellulose degradable composite barrier materials, can solve problems such as unresolved dispersion, achieve good barrier properties and mechanical properties, and be cheap, The effect of simple preparation method

Inactive Publication Date: 2018-07-27
CHANGDE JINRUN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical properties and heat resistance of composite materials prepared by this method have been improved, the problem of dispersion has not been solved.

Method used

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  • Preparation method of polylactic acid/modified nanocellulose composite barrier material
  • Preparation method of polylactic acid/modified nanocellulose composite barrier material
  • Preparation method of polylactic acid/modified nanocellulose composite barrier material

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Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of polylactic acid / modified nanocellulose degradable composite barrier material, characterized in that it comprises the following steps:

[0030] (1) Carboxylate modification of nanocellulose: prepare 8 wt% nanocellulose aqueous suspension, add nanocellulose aqueous suspension to the vacuum distillation reaction system, and add HCl to adjust the pH to 4.5. Add benzoic acid to the reaction system, and the molar ratio of benzoic acid to nanocellulose is 8:1. Insulate and react at 120°C for 20 hours. After the reaction, add ethanol at room temperature for homogeneous dispersion-centrifugal washing to obtain carboxylated modified nanocellulose, which is prepared as a modified nanocellulose suspension for use ; Finally, the carboxylic acid dissolved in the washing ethanol is recovered by a rotary evaporator to realize recycling.

[0031] (2) Preparation of polylactic acid / modified nanocellulose composite material by the Pickering emulsion method: add th...

Embodiment 2

[0034] A preparation method of polylactic acid / modified nanocellulose degradable composite barrier material, characterized in that it comprises the following steps:

[0035] (1) Carboxylate modification of nanocellulose: prepare 12wt% nanocellulose aqueous suspension, add nanocellulose aqueous suspension to the vacuum distillation reaction system, and add HCl to adjust the pH to 4.5. Add phenylpropionic acid to the reaction system, and the molar ratio of phenylpropionic acid to nanocellulose is 12:1. Insulate and react at 150°C for 25 hours. After the reaction, add ethanol at room temperature for homogeneous dispersion-centrifugal washing to obtain carboxylated modified nanocellulose, which is prepared as a modified nanocellulose suspension for use ; Finally, the carboxylic acid dissolved in the washing ethanol is recovered by a rotary evaporator to realize recycling.

[0036] (2) Preparation of polylactic acid / modified nanocellulose composite material by the Pickering emulsi...

Embodiment 3

[0039] A preparation method of polylactic acid / modified nanocellulose degradable composite barrier material, characterized in that it comprises the following steps:

[0040] (1) Carboxylate modification of nanocellulose: prepare 10% nanocellulose aqueous suspension, add nanocellulose aqueous suspension to the vacuum distillation reaction system, and add HCl to adjust the pH to 4.5. Add phenylacetic acid to the reaction system, wherein the molar ratio of phenylacetic acid to nanocellulose is 10:1. Insulate and react at 135°C for 22 hours. After the reaction, add ethanol at room temperature for homogeneous dispersion-centrifugal washing to obtain carboxylated modified nanocellulose, which is prepared as a modified nanocellulose suspension for use ; Finally, the carboxylic acid dissolved in the washing ethanol is recovered by a rotary evaporator to realize recycling.

[0041] (2) Preparation of polylactic acid / modified nanocellulose composite material by the Pickering emulsion m...

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Abstract

The invention discloses a preparation method of a polylactic acid / modified nanocellulose composite barrier material. The preparation method comprises the following steps: (1) modifying the nanocellulose through a carboxylic acid esterification method; (2) preparing the polylactic acid / modified nanocellulose composite barrier material through a Pickering emulsion method. According to the preparation method disclosed by the invention, chemical modification is carried out on the surface of the nanocellulose by adopting a carboxylic acid type substance; the carboxylic acid type substance can be used as a reactant and also has the effect of a solvent medium; a great use amount of an organic solvent is avoided by the method and the carboxylic acid type substance can be recycled and purified, andcyclically utilized, so that real environment-friendly and sustainable development is realized. The composite material is prepared by adopting the Pickering emulsion method; in a process of forming emulsion, the two materials are uniformly dispersed and a subsequent high-pressure homogenization process is not needed. The high-barrier composite material disclosed by the invention has good barrierperformance and mechanical properties and is a relatively ideal composite barrier material.

Description

technical field [0001] The invention belongs to the technical field of barrier composite material synthesis, and in particular relates to a preparation method of a polylactic acid / modified nanocellulose degradable composite barrier material. Background technique [0002] In recent years, with the rapid development of social economy, all kinds of consumer goods are rushing out, and the energy consumption is huge, causing people to face the crisis of resource shortage. In addition, the traditional non-renewable petroleum-based resources are putting more and more pressure on the environment, which has attracted the attention of the world, and many researchers are committed to the research and development of renewable resources that can replace petroleum. It is imminent to develop and use new sustainable development materials. Degradable polymer materials are new materials that emerged in this crisis situation, and have been applied in many fields, such as water environment, pac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08L67/04C08L1/10C08B15/02C08B3/10
CPCC08B3/10C08B15/02C08J3/005C08J2367/04C08J2401/10
Inventor 余赞田璐钟文陈华章杰韦雪雪张勇军杜建军
Owner CHANGDE JINRUN NEW MATERIAL TECH CO LTD
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