Preparation method of lignin-nanocelluose reinforced polylactic acid composite film

A technology of nanocellulose and polylactic acid, which is applied in the field of organic polymer compounds, can solve the problems of high modulus and limited application range due to interfacial interaction, and achieve the effect of improving adhesion.

Inactive Publication Date: 2015-06-10
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nanocellulose obtained from plant resources has a large specific surface area, high modulus, and a large number of hydroxyl groups on the surface, forming intramolecular and intermolecular hydrogen bonds, and has high mechanical strength; it can be used as a reinforcing phase to improve the matrix At the same time, the poor interfacial interaction between nanocellulose and polymer matrix limits its application range as a reinforcing material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Prepare materials according to the following weight ratio:

[0031] Polylactic acid 10g, lignocellulose nanocellulose 0.1g, N,N-dimethylacetamide 50mL. The preparation method of lignocellulose nanocellulose is: the wood pulp board (first pulverized with a pulverizer) is placed in 20wt% sulfuric acid solution, the solid-to-liquid ratio is 1:20g / mL, hydrolyzed at 80°C for 5 hours, and then subjected to high-speed centrifugal precipitation. Wash the precipitate with deionized water until the eluate is neutral, and the obtained solid is lignocellulose, and then transfer the solid to N-N dimethylacetamide.

[0032] 2. Preparation of casting film stock solution

[0033] Homogenize under a high pressure of 100MPa, and homogenize 8 times in total, evenly disperse the lignocellulose nanocellulose in N,N-dimethylacetamide, then add polylactic acid, and stir ultrasonically for 3 hours at 80°C (ultrasonic The stirring power is 200W), and the lignin nanocellulose-polylactic aci...

Embodiment 2

[0042] 1. Prepare materials according to the following weight ratio:

[0043] Polylactic acid: 10g, lignonanocellulose: 0.3g, N,N-dimethylacetamide 50mL. The preparation method of lignocellulose nanocellulose is as follows: wood pulp board (crushed with a pulverizer before use) is placed in 20wt% sulfuric acid solution, the solid-to-liquid ratio is 1:20g / mL, hydrolyzed at 90°C for 4 hours, and then subjected to high-speed centrifugation Precipitate, wash the precipitate with deionized water until the eluate is neutral, and the obtained solid is lignin nanocellulose, and then transfer the solid to N-N dimethylacetamide.

[0044] 2. Preparation of casting film stock solution

[0045] Homogenize under a high pressure of 100MPa, and homogenize for 10 times in total, evenly disperse the lignocellulose nanocellulose in N,N-dimethylacetamide, then add polylactic acid, and stir ultrasonically for 3 hours at 80°C (ultrasonic The stirring power is 200W), and the lignin nanocellulose-p...

Embodiment 3

[0054] 1. Prepare materials according to the following weight ratio:

[0055] Polylactic acid 10g, lignocellulose nanocellulose 0.5g, N,N-dimethylacetamide 50mL. The preparation method of lignonanocellulose is: wood pulp board (crushed with pulverizer before use) is placed in 20wt% sulfuric acid solution, solid-to-liquid ratio 1:20g / mL, hydrolyzed at 80 ℃ for 5 hours, then through high-speed centrifugation Precipitate, wash the precipitate with deionized water until the eluate is neutral, and the obtained solid is lignin nanocellulose, and then transfer the solid to N-N dimethylacetamide.

[0056] 2. Preparation of casting film stock solution

[0057] Homogenize under a high pressure of 100MPa, homogenize 5 times in total, disperse lignocellulose nanocellulose in N,N-dimethylacetamide, then add polylactic acid, and stir ultrasonically at 80°C for 3h (ultrasonic The stirring power is 200W), and the lignin nanocellulose-polylactic acid cast film stock solution is obtained.

...

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Abstract

The invention provides a preparation method of a lignin-nanocelluose reinforced polylactic acid composite film. The preparation method comprises the following steps: 1) preparation of lignin-nanocelluose by adopting an acid hydrolysis-high-pressure homogeneity method, namely hydrolyzing raw materials with sulfuric acid, and then performing high-pressure homogeneity to obtain lignin-nanocelluose; and 2) preparation of the lignin-nanocelluose reinforced polylactic acid composite film by adopting a solution casting-solvent evaporation method, namely taking 8-10 parts by weight of polylactic acid and 0.08-0.5 part by weight of lignin-nanocelluose, mixing with an organic solvent to obtain a film casting stock solution, performing vacuum defoamation treatment on the film casting stock solution, and preparing the thin film from the film casting stock solution. According to the preparation method, the lignin-containing nanocelluose and the polylactic acid are compounded for the first time, the polylactic acid is reinforced with nanomaterials, the problem that the compatibility of the nanocelluose and the polylactic acid matrix is bad to cause low mechanical performance can be solved by virtue of the adopted lignin, and the adhesion action of a phase interface can be improved.

Description

technical field [0001] The invention belongs to the field of organic polymer compounds, and in particular relates to a preparation method of a membrane material containing polylactic acid. Background technique [0002] Polylactic acid can be prepared from biomass resources, such as plant starch, so it has a large industrial scale; polylactic acid is biodegradable and will eventually be decomposed into carbon dioxide and water in the environment. Moreover, polylactic acid has good molding processability. As an environmentally friendly biodegradable plastic to replace traditional petroleum-based plastics, polylactic acid has strong competitiveness and broad application prospects; however, polylactic acid has disadvantages such as hard quality, poor toughness, and poor heat resistance, which greatly limit Its application in aviation, automobile and other engineering fields, so it is of great significance to strengthen and toughen polylactic acid. Researchers in the field cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/04C08L97/02
Inventor 张力平
Owner BEIJING FORESTRY UNIVERSITY
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