Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for quickly preparing ester derivatives of cellulose by transesterification

A technology of transesterification reaction and cellulose, applied in the field of cellulose ester derivatives, can solve the problems of unfavorable industrial production, long reaction time, non-uniform products, etc., and achieve the effects of fast reaction, rapid reaction and uniform product texture

Active Publication Date: 2014-09-10
SOUTH CHINA UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above synthesis method, the reaction time of the synthesis process is long, the product is not uniform, and the solvent of the homogeneous system is expensive, which is not conducive to industrial production.
However, in a heterogeneous environment, the rapid preparation of cellulose ester derivatives with uniform texture by transesterification has not been reported yet.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for quickly preparing ester derivatives of cellulose by transesterification
  • Method for quickly preparing ester derivatives of cellulose by transesterification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for rapidly preparing cellulose ester derivatives by transesterification, comprising the following steps:

[0024] (1) Activation: put 0.4g of cotton fiber in a single-necked flask filled with 20ml of 20% NaOH aqueous solution, keep stirring for 10min, and filter to obtain alkali cellulose;

[0025] (2) Reaction: Add the alkali cellulose obtained in step (1) to 10ml of DMSO preheated to 120°C, and after the temperature stabilizes, add vinyl acetate, the anhydroglucose unit (AGU) of vinyl acetate and cellulose The molar ratio is 6:1, stirring rapidly for 10 minutes;

[0026] (3) Precipitation and purification: After the reaction is completed, pour the solution obtained in step (2) into 100ml of an aqueous solution with a volume percentage of 80% ethanol, stir rapidly, and precipitate to obtain a reaction product, which is centrifuged several times until the solution is Neutral to obtain cellulose acetate cellulose;

[0027] (4), dry. The drying is vacuum dryi...

Embodiment 2

[0031] In this embodiment, a method for rapidly preparing cellulose ester derivatives by transesterification comprises the following steps:

[0032] (1) Activation: put 0.8g of dissolving pulp in a single-necked flask filled with 20ml of 16% NaOH aqueous solution, keep stirring for 5min, and filter to obtain alkali cellulose;

[0033] (2) Reaction: Add the alkali cellulose obtained in step (1) to 10ml of N-methylpyrrolidone preheated to 80°C, and after the temperature stabilizes, add vinyl propionate, the molar ratio of vinyl propionate to AGU 6:1, stir rapidly for 5 minutes;

[0034] (3) Precipitation and purification: After the reaction is completed, pour the solution obtained in step (2) into 100ml of an aqueous solution with a volume percentage of 10% ethanol, stir rapidly, and precipitate to obtain a reaction product, which is centrifuged or filtered and washed until The solution is neutral, and cellulose propionate is obtained;

[0035] (4), dry. The drying is vacuum ...

Embodiment 3

[0038] In this embodiment, a method for rapidly preparing cellulose ester derivatives by transesterification comprises the following steps:

[0039] (1) Activation: put 0.4g of microcrystalline cellulose in a single-necked flask filled with 20ml of 14% NaOH aqueous solution, keep stirring for 5min, and filter to obtain alkali cellulose;

[0040] (2) Reaction: Add the alkali cellulose obtained in step (1) to 10ml DMSO preheated to 100°C, and after the temperature stabilizes, add vinyl butyrate, the molar ratio of vinyl butyrate to AGU is 6:1, Stir rapidly for 5 minutes;

[0041] (3) Precipitation and purification: After the reaction is completed, pour the solution obtained in step (2) into 100ml of an aqueous solution with a volume percentage of 5% ethanol, stir rapidly, and precipitate to obtain a reaction product, which is centrifuged or filtered and washed until The solution is neutral, and cellulose butyrate is obtained;

[0042] (4), dry. The drying is vacuum drying, th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
degree of substitutionaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for quickly preparing ester derivatives of cellulose by transesterification, which comprises the following steps of: (1) activation, which is to put cellulose in a solution of an alkali hydroxide to obtain alkali cellulose; (2) reaction, which is to put the cellulose obtained by the step (1) into a reaction solvent, heating the solution, adding a vinyl ester etherifying agent, and reacting; (3) precipitation and purification, which to pour the solution obtained by the step (2) into a mixed solution of ethanol and water, precipitating the product of the reaction, washing the precipitate for several times till the washing solution is neutral; and (4) drying. According to the method, alkali hydroxides are used for the first time as catalysts to prepare homogeneous cellulose ester derivatives in a heterogeneous system. The simple synthesis method accelerates reaction, has slight effect on cellulose polymerization, and is suitable for different cellulose raw materials with low requirements on the materials. The product of the synthesis method is uniform.

Description

technical field [0001] The invention relates to cellulose ester derivatives, in particular to a synthesis method for rapidly preparing cellulose ester derivatives through transesterification, and belongs to the field of polymer synthesis. Background technique [0002] Cellulose is a natural polymer formed by connecting D-glucose with β-1,4 glycosidic bonds. It is the most widely distributed and most abundant polysaccharide in nature. As the most important component of plant cell wall, cellulose has the characteristics of easy degradation, renewable, abundant raw materials and low price. It is estimated that about 10% of cellulose is biosynthesized globally each year. 11 tons, only a small portion of which is used by humans. As a large agricultural country, my country is rich in agricultural and forestry waste biomass resources, and its high-value utilization will help reduce human dependence on petrochemical products. At present, the cellulose industry is mainly concentra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08B3/02C08B3/06C08B3/08C08B3/10
Inventor 曹学飞孙少妮孙润仓彭湃钟林新彭新文
Owner SOUTH CHINA UNIV OF TECH