Esterification modification method of microcrystalline cellulose

A technology of microcrystalline cellulose and esterification modification, applied in the field of solid material modification, can solve the problems of complex reaction process, toxic thionyl chloride, etc. Effect

Inactive Publication Date: 2012-10-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only makes the reaction process complicated, but...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix 2 g of microcrystalline cellulose and 100 mL of water, and perform micronization treatment with a shear emulsifier. The rotating speed of the shear emulsifier is 10000 rpm, and the miniaturization treatment time is 30 minutes. Then it was centrifuged and washed with absolute ethanol, and dried to obtain microcrystalline cellulose treated with micronization.

[0019] Mix microcrystalline cellulose with 0.5% soybean oil ethanol solution at a mass ratio of 1:1, react at 150° C. for 15 minutes, then centrifuge and wash with absolute ethanol and dry at room temperature. The esterified modified microcrystalline cellulose was obtained.

Embodiment 2

[0021] As in Example 1, the microcrystalline cellulose after micronization treatment was mixed with soybean oil acetone solution with a mass concentration of 20% at a mass ratio of 1:15, reacted at 90° C. for 8 hours, and then centrifuged and washed with absolute ethanol. Allow to dry at room temperature. The esterified modified microcrystalline cellulose was obtained.

Embodiment 3

[0023] As in Example 1, the microcrystalline cellulose after micronization treatment and the lauric acid ethanol solution with a mass concentration of 10% were mixed in a mass ratio of 1:3, reacted at 130° C. for 150 minutes, and then centrifuged and washed with absolute ethanol. Allow to dry at room temperature. The esterified modified microcrystalline cellulose was obtained.

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PUM

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Abstract

The invention relates to a surface esterification modification method of microcrystalline cellulose and belongs to the technical field of surface modification of solid materials. According to the technical scheme, the method comprises the steps of: carrying out micronization treatment on the microcrystalline cellulose, mixing the micronized microcrystalline cellulose and esterifying agent solution according to a certain mass ratio, heating the system to enable the esterifying agent and hydroxyl on the surface of the microcrystalline cellulose to be subjected to esterification, and finally obtaining the esterified microcrystalline cellulose by centrifugally washing and drying process. Agglomeration phenomenon caused by a hydrogen bonding action between microcrystalline cellulose particles is effectively restrained after the esterification modification treatment; the surface polarity is obviously reduced; the microcrystalline cellulose can be stably dispersed in an organic solvent with the lowest polarity, and a crystal structure of the microcrystalline cellulose is not destroyed by the esterification modification. The esterification modification method of microcrystalline cellulose disclosed by the invention has the advantages of simple process, no-added catalyst, low production cost, and green and environment-friendly characteristics. The surface esterified and modified microcrystalline cellulose prepared by the method has good application prospect in the field of polymer composite materials.

Description

technical field [0001] The invention relates to an esterification modification method for microcrystalline cellulose, which relates to the reaction of an esterification agent with hydroxyl groups on the surface of the microcrystalline cellulose, and belongs to the technical field of solid material modification methods. Background technique [0002] Microcrystalline cellulose (MCC) is the product of natural cellulose hydrolyzed by acid to the limit degree of polymerization. It can be used as a reinforcing agent for composite materials to improve the performance of materials due to the advantages of high yield, renewable, degradable, and wide sources. However, since the surface of microcrystalline cellulose contains a large number of hydroxyl groups, the cellulose particles are easily agglomerated through the interaction of hydrogen bonds. In, the dispersibility of cellulose particles is very poor. As a result, microcrystalline cellulose can only be added to composite materi...

Claims

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Application Information

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IPC IPC(8): C08B3/00C08B3/10
Inventor 周江董晓刚蒋蔓佟金陈东辉马云海孙霁宇陈玉香常志勇
Owner JILIN UNIV
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