Title:
HIGH-CONCENTRATION AND DEEP DYEING METHOD FOR NANOCELLULOSE
Document Type and Number:
WIPO Patent Application WO/2018/227894
Kind Code:
A1
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.
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Inventors:
FU SHIYU (CN)
WANG WENBO (CN)
WANG WENBO (CN)
Application Number:
PCT/CN2017/113756
Publication Date:
December 20, 2018
Filing Date:
November 30, 2017
Export Citation:
Assignee:
UNIV SOUTH CHINA TECH (CN)
International Classes:
D06P3/66; C08J3/07; C08L1/02; D06P1/38; D06P1/81
Domestic Patent References:
| WO2017091893A1 | 2017-06-08 |
Foreign References:
| CN107201678A | 2017-09-26 | |||
| CN103590283A | 2014-02-19 | |||
| US6183596B1 | 2001-02-06 | |||
| US20160010275A1 | 2016-01-14 | |||
| JP2014163758A | 2014-09-08 |
Other References:
GORGIEVA, S. ET AL.: "Polydispersity and assembling phenomena of native and reactive dye-labelled nanocellulose", CELLULOSE, vol. 22, no. 6, 23 September 2015 (2015-09-23), XP035582795, ISSN: 0969-0239
Attorney, Agent or Firm:
YOGO PATENT & TRADEMARK AGENCY LIMITED COMPANY (CN)
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