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

A kind of high-concentration depth dyeing method of nanocellulose

A technology of nano-cellulose and dyeing method, which is applied in the field of high-concentration deep dyeing of nano-cellulose, can solve the problems that it is difficult to realize the full utilization of nano-cellulose deep-dyeing dyes and increase the difficulty of wastewater treatment, so as to reduce the amount of washing water, Effect of reducing ineffective hydrolysis and good stability

Active Publication Date: 2020-07-28
SOUTH CHINA UNIV OF TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Since nanocellulose will appear jelly-like when the concentration is slightly higher, the concentration of nanocellulose and reactive dyes in ordinary aqueous solution for grafting reaction is generally 0.5%-2%, and it is difficult to achieve deep dyeing of nanocellulose and the full use of dyes
And because both nanocellulose and reactive dyes have strong negative charge, a large amount of strong electrolyte salt must be added to offset the negative charge effect during the reaction process, and the addition of a large amount of salt also increases the difficulty of wastewater treatment

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 1 wt% NaCl to 500 ml of nanocellulose aqueous solution with a concentration of 0.5 wt%, and centrifuge with a high-speed refrigerated centrifuge (9000 rpm). The resulting precipitate was dispersed in absolute ethanol and centrifuged several times. Add deionized water to the prepared nanocellulose-ethanol mixture to configure the nanocellulose mixture (the mass ratio of nanocellulose to water is 10:90, and the volume ratio of absolute ethanol to water is 95:5). Add 10wt% Reactive Red120 reactive dyes, 10g / L NaCl, 10g / L NaCl in the prepared mixed solution 2 CO 3 , stir well. Raise the temperature to condense the mixed solution to reflux, and react for 120 minutes. After the reaction was completed, the reaction vessel was rapidly cooled with cold water, and the reaction solution was centrifuged with a high-speed refrigerated centrifuge (9000 rpm). The obtained precipitate was dispersed into 1 wt% NaCl solution, and centrifuged repeatedly until the supernatant was c...

Embodiment 2

[0040]Add 1 wt% NaCl to 500 ml of nanocellulose aqueous solution with a concentration of 0.5 wt%, and centrifuge with a high-speed refrigerated centrifuge (9000 rpm). Disperse the obtained precipitate in absolute ethanol and repeat centrifugation several times. Add deionized water to the prepared nanocellulose-ethanol mixture to configure the nanocellulose mixture (the mass ratio of nanocellulose to water is 7.5:92.5, and the volume ratio of absolute ethanol to water is 50:50). Add 10wt% of ReactiveRed 120 reactive dyes, 10g / L NaCl, 10g / L NaCl to the prepared mixed solution 2 CO 3 , stir well. Raise the temperature to condense the mixed solution to reflux, and react for 120 minutes. After the reaction was completed, the reaction vessel was rapidly cooled with cold water, and the reaction solution was centrifuged with a high-speed refrigerated centrifuge (9000 rpm). The obtained precipitate was dispersed into 1 wt% NaCl solution, and centrifuged repeatedly until the superna...

Embodiment 3

[0043] Add 1 wt% NaCl to 500 ml of nanocellulose aqueous solution with a concentration of 0.5 wt%, and centrifuge with a high-speed refrigerated centrifuge (9000 rpm). Disperse the obtained precipitate in absolute ethanol and repeat centrifugation several times. Add deionized water to the prepared nanocellulose-ethanol mixture to configure the nanocellulose mixture (the mass ratio of nanocellulose to water is 5:95, and the volume ratio of absolute ethanol to water is 80:20). Add 2wt% Reactive Red 120 reactive dyes, 10g / L Na 2 CO 3 , stir well. Raise the temperature to condense the mixed solution to reflux, and react for 120 minutes. After the reaction was completed, the reaction vessel was rapidly cooled with cold water, and the reaction solution was centrifuged with a high-speed refrigerated centrifuge (9000 rpm). The obtained precipitate was dispersed into 50% ethanol aqueous solution, and centrifuged repeatedly until the supernatant was colorless, and the separated prec...

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
grafting amountaaaaaaaaaa
grafting amountaaaaaaaaaa
grafting amountaaaaaaaaaa
Login to View More

Abstract

Disclosed in the present invention is a high-concentration and deep dyeing method for nanocellulose. Said method comprises the steps of: adding a strong electrolyte salt to an aqueous solution of nanocellulose, performing centrifugation, and then adding ethanol and water to formulate a nanocellulose mixed solution; adding an active dye, an alkali or a strong alkali weak acid salt to the mixed solution, and then heating, condensing and refluxing the solution; and after completion of the reaction, performing centrifugation, and collecting the precipitate, so as to obtain deeply dyed nanocellulose. The concentration of the nanocellulose in the present invention can be increased to 5%-10% from 0.5%-2% of common nanocellulose in a dyeing reaction, thereby increasing the graft rate. The dye-uptake of a dye can be increased to 50%-70% from 20%-40% of common nanocellulose, thereby increasing the utilization rate of the dye. The present invention is beneficial to the treatment of reaction wastewater. Furthermore, the dyed nanocellulose prepared by the present invention has very good stability, does not easily fade, is small in size, and has a high dyeability, being desirable to be applied in fields such as nanocellulose inkjet printing and paper anti-counterfeiting, having high practical value.

Description

technical field [0001] The invention belongs to the field of nanofiber materials, and in particular relates to a high-concentration deep dyeing method of nanocellulose. Background technique [0002] Since nanocellulose will appear jelly-like when the concentration is slightly higher, the concentration of nanocellulose and reactive dyes in ordinary aqueous solution for grafting reaction is generally 0.5%-2%, and it is difficult to achieve deep dyeing of nanocellulose And make full use of dyes. And because both nanocellulose and reactive dyes have strong negative charge, a large amount of strong electrolyte salt must be added to offset the negative charge effect during the reaction process, and the addition of a large amount of salt also increases the difficulty of wastewater treatment. The method of the invention can increase the concentration of nano-cellulose in the reaction process to 5%-10%, and realize high-concentration and deep salt-free dyeing of nano-cellulose. The...

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): D06P3/66D06P1/38D06P1/81C08J3/07C08L1/02
CPCC08J3/07C08J2301/02D06P1/38D06P1/81D06P3/66
Inventor 付时雨王文波
Owner SOUTH CHINA UNIV OF TECH