A kind of high sulfate group graft type cellulose nanocrystal and its preparation method and application

A sulfate group and nano-crystal technology, applied in the post-treatment of cellulose pulp, fiber raw materials, fiber raw material treatment, etc., can solve problems such as easy gelatinization, prevent mutual agglomeration, improve dispersion performance, and high Zeta-potential Effect

Active Publication Date: 2020-08-28
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current existing conditions for preparing CNCs by sulfuric acid hydrolysis of cellulose-containing materials include hydrolysis of cellulose-containing materials with sulfuric acid with a concentration of 50-65%, the hydrolysis time is 0.5-1.5h, and the hydrolysis temperature is 50-55°C In this method, since the cellulose-containing material is not protected by the carrier, it is prone to gelatinization under long-term and high-temperature hydrolysis conditions

Method used

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  • A kind of high sulfate group graft type cellulose nanocrystal and its preparation method and application
  • A kind of high sulfate group graft type cellulose nanocrystal and its preparation method and application
  • A kind of high sulfate group graft type cellulose nanocrystal and its preparation method and application

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Effect test

Embodiment 1

[0050] The waste paper produced in the production process of an enterprise is used to prepare high sulfate group grafted cellulose nanocrystals according to the following steps:

[0051] (1) Pulverization: After drying the waste paper, pulverize it with an ultrafine pulverizer for 6 minutes, and collect the paper scraps with a 60-mesh screen;

[0052] (2) Glycerol swelling: use glycerol to swell the paper scraps under stirring conditions (the mass ratio of glycerol to the paper scraps is 15:1), the stirring rate is 400rpm, and the temperature is 50°C ;

[0053] (3) Fiber separation and decolorization treatment: the swollen paper scraps of step (2) are dispersed into an aqueous solution containing 3.5% sodium hydroxide and 2% hydrogen peroxide (by weight) according to the mass ratio of 1:30 ), keeping the temperature at 60°C, stirring speed at 600rpm, reacting for 2h, the treated mixture was centrifuged and dehydrated, the solid obtained by centrifugation was dispersed with co...

Embodiment 2

[0060] The waste paper produced in the production process of an enterprise is used to prepare high sulfate group grafted cellulose nanocrystals according to the following steps:

[0061] (1) Pulverization: After the waste paper is dried, pulverize it with a superfine pulverizer for 10 minutes, and collect paper scraps with an 80-mesh screen.

[0062] (2) Glycerol swelling: the waste paper scraps were swollen under the condition of stirring, the stirring rate was 800 rpm, and the temperature was 55°C.

[0063] (3) Fiber separation and decolorization treatment: Disperse the swollen paper scraps obtained in step (2) into an aqueous solution containing 4% sodium hydroxide and 3% hydrogen peroxide according to a mass ratio of 1:40, and keep the temperature 65°C, stirring speed 1000rpm, reacting for 2.5h, the treated mixture was centrifuged and dehydrated, the solid obtained by centrifugation was dispersed with cold distilled water and then centrifuged and dehydrated. This kind of w...

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Abstract

The invention relates to a high sulfate group grafted cellulose nano crystal and its preparation method and application. The high sulfate group grafted cellulose nanocrystal surface‑SO 3 ‑ The content is 2.5‑4.0mmol / g. The preparation method comprises the following steps: (1) drying the waste paper, crushing and sieving to obtain paper scraps; (2) swelling the paper scraps with glycerol under stirring conditions, (3) making the swollen paper scraps The crumbs are dispersed into an aqueous solution containing alkali and peroxide and stirred for fiber separation and decolorization, and then centrifuged to obtain a solid; (4) the solid obtained in step (3) is dispersed in concentrated sulfuric acid for hydrolysis, and then 20- 30 times the volume of cold water to terminate the reaction, centrifuged until a light blue colloidal solution appeared; (5) dialyzing the colloidal solution in distilled water with a dialysis bag to remove excess acid. The high-sulfate group grafted cellulose nanocrystal is used to prepare an O / W microemulsion, and can significantly enhance the emulsification performance of the O / W microemulsion.

Description

technical field [0001] The invention relates to a cellulose nanocrystal, more specifically, to a high-sulfate group grafted cellulose nanocrystal, a preparation method and application thereof. Background technique [0002] The waste of resources and environmental pollution caused by waste paper is very serious every year, and waste paper can be turned into treasure, and CNCs can be extracted from it to enhance the emulsification in O / W microemulsions. In addition, CNCs can be used in biology, medicine, material technology and other fields due to their high crystallinity, high Young's modulus, and their nano-size effect, chemical modification, and degradability. There are a large number of hydroxyl groups and polar groups on the surface of CNCs, which makes CNCs easy to agglomerate like ordinary nanomaterials, and it is difficult to disperse and be compatible in non-polar polymer matrices. Surface modification is a key step to realize the application of nanocellulose . The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/02D21C5/02D21C3/02D21B1/02D21C9/18D21C9/16B01F17/56C09K23/56
CPCD21B1/021D21C3/02D21C5/02D21C5/022D21C9/163D21C9/18C08B15/02C09K23/00Y02W30/64
Inventor 张洪才钱亚楠陈舜胜薛永霞
Owner SHANGHAI OCEAN UNIV
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