Method for improving mechanical property of cellulose acetate

A technology of cellulose acetate and nanocellulose, which is applied in the field of polymer material preparation and application, can solve the problems of poor performance index and decreased light transmittance, achieve high Young's modulus, increase tensile strength, and improve acetic acid Effects of cellulose mechanical properties

Active Publication Date: 2012-09-12
山东赫达集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People have tried to modify it by blending montmorillonite, hemp fiber and nano-titanium dioxide particles with cellulose acetate, but these methods often fail to improve a certain index in tensile strength, elastic modulus and elongation at break. At the same time, it will cause other performance indicators to deteriorate, and will lead to a significant decrease in light transmittance.

Method used

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  • Method for improving mechanical property of cellulose acetate
  • Method for improving mechanical property of cellulose acetate
  • Method for improving mechanical property of cellulose acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Surface acetification of nanocellulose whiskers

[0027] (1) Preparation of nanocellulose whisker slurry

[0028] Immerse 20 g of cellulose in a sulfuric acid solution with a concentration of 64%, with a liquid-solid ratio of 17.5 mL / g, stir and react in a water bath at 45°C for 20 min, dilute with water to stop the reaction, and obtain a reaction solution A1. The reaction solution A1 was centrifuged, and the supernatant was removed. Centrifuge and wash with water twice, and replace with glacial acetic acid to obtain nanocellulose whisker slurry B1.

[0029] (2) Acetate on the surface of nanocellulose whiskers

[0030] 1) Mix 4g of slurry B1 and 10g of glacial acetic acid evenly to obtain slurry C1;

[0031] 2) Make slurry C1 swell at 40°C for 15 minutes and then cool to room temperature;

[0032] 3) Add a mixed solution of 0.01 g of sulfuric acid, 0.2 g of acetic anhydride and 3 g of glacial acetic acid to the cooled slurry C1 to obtain a mixed solution D1;

[...

Embodiment 2

[0039] 1. Surface acetification of nanocellulose whiskers

[0040] (1) Preparation of nanocellulose whisker slurry

[0041] Immerse 20 g of cellulose in a sulfuric acid solution with a concentration of 64%, with a liquid-solid ratio of 17.5 mL / g, stir and react in a water bath at 45°C for 20 min, dilute with water to stop the reaction, and obtain a reaction solution A2. The reaction solution A2 was centrifuged, and the supernatant was removed. Centrifuge and wash with water twice, and then replace with glacial acetic acid to obtain nanocellulose whisker slurry B2.

[0042] (2) Acetate on the surface of nanocellulose whiskers

[0043] 1) Mix 4g of slurry B2 with 15g of glacial acetic acid to obtain slurry C2;

[0044] 2) Make slurry C2 swell at 35°C for 25 minutes and then cool to room temperature;

[0045] 3) Add a mixed solution of 0.005 g of sulfuric acid, 0.15 g of acetic anhydride and 4 g of glacial acetic acid to the cooled slurry C2 to obtain a mixed solution, and ob...

Embodiment 3

[0052] 1. Surface acetification of nanocellulose whiskers

[0053] (1) Preparation of nanocellulose whisker slurry

[0054] Immerse 20 g of cellulose in a sulfuric acid solution with a concentration of 64%, with a liquid-solid ratio of 17.5 mL / g, stir and react in a water bath at 45°C for 20 min, dilute with water to stop the reaction, and obtain a reaction solution A3. The reaction solution A3 was centrifuged, and the supernatant was removed. Centrifuge and wash with water twice, and then replace with glacial acetic acid to obtain nanocellulose whisker slurry B3.

[0055] (2) Acetate on the surface of nanocellulose whiskers

[0056] 1) Mix 4g of slurry B3 with 13g of glacial acetic acid to obtain slurry C3;

[0057] 2) Make slurry C3 swell at 50°C for 20 minutes and then cool to room temperature;

[0058] 3) Add a mixed solution of 0.008 g of sulfuric acid, 0.6 g of acetic anhydride and 5 g of glacial acetic acid into the cooled slurry C3 to obtain a mixed solution D3;

[...

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Abstract

The invention relates to a method for improving the mechanical property of cellulose acetate and belongs to the field of preparation and application of high polymer materials. The method comprises the following specific steps of: preparing nano cellulose whisker slurry; uniformly mixing slurry B and glacial acetic acid to obtain slurry C; adding a mixed solution of sulfuric acid, acetic anhydride and the glacial acetic acid into the cooled slurry C to obtain a mixed solution D; stirring the mixed solution D at room temperature, slowly heating to 35 to 55 DEG C, and reacting at the temperature of between 35 and 55 DEG C to obtain reactant E; cooling the reactant E to room temperature, and washing slurry at the bottom by using ethanol and acetone sequentially, and performing suction-filtering to obtain a filter cake F; placing the filter cake F in acetone and performing ultrasonic dispersion to obtain acetic acid esterification nano cellulose suspension G which can suspend stably in acetone; and dissolving cellulose acetate in the suspension G and casting to form a cellulose acetate composite film. According to the method, on the premise of not reducing the light transmittance of the cellulose acetate obviously, the tensile strength, the elastic modulus and the breaking elongation of the cellulose acetate are improved comprehensively.

Description

technical field [0001] The invention relates to a method for improving the mechanical properties of cellulose acetate, which belongs to the field of polymer material preparation and application. Background technique [0002] With the depletion of oil resources, rising prices, and serious environmental pollution problems, biodegradable green materials are getting more and more attention and affirmation. Cellulose is the most abundant renewable natural polymer in the world today, and it is the general trend to use its derivatives to replace traditional synthetic polymer materials. Cellulose acetate is an important cellulose derivative. It is widely used in plastics, cigarette filters, packaging, films, artificial kidneys, Reverse osmosis membrane, film, liquid crystal material, etc. However, in its application process, cellulose acetate has also exposed shortcomings in mechanical properties and heat resistance. People have tried to modify it by blending montmorillonite, hem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/12C08B3/06C08B3/22C08J5/18C08J3/03
Inventor 王文俊杨振钰邵自强毕新德毕英德李永红王飞俊
Owner 山东赫达集团股份有限公司
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