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

Preparation method of cyanoethyl cellulose

A technology of cyanoethyl cellulose and cellulose, which is applied in the field of preparation of cyanoethyl cellulose, can solve the problems of limited degree of substitution and uniformity of products, and achieve the effects of low price, fast speed and low reaction temperature

Inactive Publication Date: 2009-09-09
WUHAN UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the degree of substitution and uniformity of the product are extremely limited

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
  • Preparation method of cyanoethyl cellulose
  • Preparation method of cyanoethyl cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take by weighing 600 grams of 7wt%NaOH / 12wt% urea aqueous solution, precool to-12 ℃ in refrigerator; 4 ) 25 g was added thereinto, and after 3-5 minutes of mechanical stirring, the linter pulp was completely dissolved to obtain a transparent cellulose solution. Weigh 500 g of the prepared cellulose solution in a three-necked flask, add dropwise (completely drop within 1 hour) 8 mL of acrylonitrile (the molar ratio of acrylonitrile to cellulose anhydroglucose unit is 1:1), mechanically stir at 8 ℃ for about 6 hours, and then add acetic acid to neutralize the reaction solution. The resulting swollen product was washed with water until neutral and then vacuum-dried to obtain a white powdery cyanoethyl cellulose product soluble in dilute alkali aqueous solution, with a weight of 21 grams and an N element content of 2.08%.

Embodiment 2

[0017] Take by weighing 500 grams of 7wt%NaOH / 12wt% urea aqueous solution, precool to-12 ℃ in the refrigerator; 4 ) 19.5 g was added thereinto, and after mechanical stirring for 3 to 5 minutes, the cotton linter pulp was completely dissolved to obtain a transparent cellulose solution. Transfer the above cellulose solution into a three-necked flask, add dropwise (completely within 1 hour) 12mL of acrylonitrile (the molar ratio of acrylonitrile to cellulose anhydroglucose unit is 1:1.5), mechanically stir and react at about 5°C for 6 hours, then add acetic acid to neutralize the reaction solution. The resulting swollen product was washed with water until neutral and then vacuum-dried to obtain a white powdery cyanoethyl cellulose product soluble in dilute alkali aqueous solution, with a weight of 22 grams and an N element content of 2.59%.

Embodiment 3

[0019] Take by weighing 500 grams of 7wt%NaOH / 12wt% urea aqueous solution, precool to-12 ℃ in the refrigerator; 4 ) 19.4 g was added therein, and after 3 to 5 minutes of mechanical stirring, the cotton linter pulp was completely dissolved to obtain a transparent cellulose solution. Transfer the above cellulose solution into a three-necked flask, add dropwise (completely drop within 1 hour) 16mL of acrylonitrile (the molar ratio of acrylonitrile to cellulose anhydroglucose unit is 1:2), mechanically stir and react at about 10°C for 6 hours, then add acetic acid to neutralize the reaction solution. The resulting reaction solution was dialyzed with tap water and distilled water, and then freeze-dried to obtain a white spongy, water-soluble cyanoethyl cellulose product, with a weight of 23 grams and an N element content of 2.86%.

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

No PUM Login to View More

Abstract

The invention discloses a preparation method for synthesizing cyanoethyl cellulose. Acrylonitrile is added to NaOH / urea homogeneous aqueous solution of cellulose, stirred and reacted at 0°C to 60°C for 10 minutes to 20 hours, and then neutralized by adding acetic acid The reaction solution is neutralized to stop the reaction; the reaction solution is vacuum-dried after dialysis or the reaction solution is filtered, washed with water and then vacuum-dried to obtain high-purity cyanoethyl cellulose dissolved in dilute alkali, water or organic solvent. The cellulose solvent used is non-toxic, non-polluting and low in price; the whole synthetic method is easy to operate, has mild reaction conditions, high speed and high yield, and does not need to add an organic solvent as a diluent. The obtained product has good film-forming properties and can be made into a colorless, transparent and soft film; and the product dissolved in an organic solvent shows good liquid crystal behavior. Thus, a new way of preparing cyanoethyl cellulose in an aqueous solution system with low cost and no pollution is opened up.

Description

technical field [0001] The invention relates to a preparation method of cyanoethyl cellulose, in particular to a method for preparing cyanoethyl cellulose by carrying out cyanoethylation reaction in a sodium hydroxide / urea aqueous solution system of cellulose. Background technique [0002] Cellulose is the most abundant renewable resource on earth, and due to its unique reaction function and molecular characteristics such as non-toxic, safe, biodegradable, hydrophilic, chiral and semi-rigid, it will become one of the main chemical raw materials in the future One (J. Schurz, Prog. Polym. Sci., 1999, 24, 481). Each anhydroglucose (AGU) unit in the cellulose molecular chain has three active -OH groups: one primary -OH group (C6 position) and two secondary -OH groups (C2 and C3 positions). Therefore, cellulose can undergo a series of chemical reactions related to -OH groups, such as oxidation reactions, ether, esterification reactions, nucleophilic substitution reactions, graft...

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): C08B11/155C08B11/22
Inventor 周金平张俐娜
Owner WUHAN UNIV