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Nano cellulose hydrogel and aerogel and preparation method and application thereof

A technology of nanocellulose and hydrogel, applied in the application field of cellulose, can solve the problems of limiting the application of nanocellulose gel, long preparation cycle, high cost, etc., to achieve easy realization of large-scale production, broaden the breadth and depth, The effect of excellent mechanical properties

Inactive Publication Date: 2018-11-23
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

For the utilization of nanocellulose, hydrogel or aerogel is a good platform product. At present, there are many reports on nanocellulose hydrogel or aerogel, but the existing methods of nanocellulose physics The characteristics of cross-linking greatly limit the improvement of the mechanical strength of hydrogel / aerogel, and the airgel materials currently prepared generally have poor elasticity and lack elasticity.
The existing nano-cellulose gel preparation process is mainly to prepare cellulose airgel by dissolving cellulose in a cellulose solvent. The cellulose airgel usually adopts a supercritical drying process, which has a long preparation cycle and high cost. Complex, difficult to control, difficult to produce in large quantities, and the performance of the prepared nanocellulose gel needs to be improved, which limits the further application of nanocellulose gel

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  • Nano cellulose hydrogel and aerogel and preparation method and application thereof
  • Nano cellulose hydrogel and aerogel and preparation method and application thereof
  • Nano cellulose hydrogel and aerogel and preparation method and application thereof

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preparation example Construction

[0049] In a first aspect, in at least one embodiment, a method for preparing a nanocellulose hydrogel is provided, comprising the following steps:

[0050] (a) pre-treating the cellulose raw material to obtain a nanocellulose dispersion;

[0051] (b) the nanocellulose dispersion is mixed with a crosslinking agent to obtain a composite dispersion;

[0052] (c) subjecting the composite dispersion to freeze-thaw treatment to obtain nanocellulose hydrogel.

[0053]Cellulose is the most abundant organic compound found on Earth and is widely used due to its availability and sustainable production. An estimated 100 billion tons of cellulose are produced each year. Cellulose exhibits very attractive properties, such as biodegradability, biocompatibility, chemical and thermal stability, and limited carbon footprint; cellulose is also a renewable resource. Nanogels have many excellent properties due to their unique microscopic network structure, such as large specific surface area, h...

Embodiment 1

[0103] A preparation method of nanocellulose hydrogel, comprising the following steps:

[0104] (1) Treatment of cellulose raw material: use wood cellulose as raw material, mechanically disintegrate it into cotton wool, weigh 1g of the dry weight of the sample, 0.1g of NaBr, 0.016g of TEMPO and 100mL of distilled water into a beaker, stir evenly, and fully dissolve. Add 6mmol sodium hypochlorite to the system, add dropwise 5M hydrochloric acid to adjust the overall system pH to 10, and start oxidation. Use an automatic titrator to automatically add 0.5M sodium hydroxide dropwise to maintain the overall system pH at 10. When the system hardly consumed sodium hydroxide solution, a small amount of ethanol solution was added dropwise to plant the reaction, and a small amount of 0.5M hydrochloric acid was added to adjust the pH to neutral. The oxidized cellulose was cleaned by centrifugation, and the insoluble matter was stored in a refrigerator at 4°C.

[0105] (2) Preparation o...

Embodiment 2

[0108] A preparation method of nanocellulose hydrogel, comprising the following steps:

[0109] (1) Treatment of cellulose raw material: take hemp cellulose as raw material, take 1g of dry weight hemp cellulose and 64% sulfuric acid at 60°C for 3 hours under the condition of solid-liquid ratio of 1:30, and carry out thorough treatment on the material after the reaction is completed. Washed and dialyzed to obtain acid decomposed hemp cellulose.

[0110] (2) Preparation of nanocellulose: take 0.5g dry weight acid-lyzed hemp cellulose and add 100mL distilled water to homogenate, operate ultrasonically, and circulate 5-6 times until the solution is clear and transparent, centrifuge to remove the precipitate, and the supernatant is The prepared nanocellulose dispersion.

[0111] (3) Preparation of nanocellulose hydrogel: the nanocellulose prepared by the above steps is used as raw material, first the nanocellulose is adjusted to a solid content concentration of 0.4%, and then the ...

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Abstract

The invention belongs to the technical field of application of cellulose and relates to a nano cellulose hydrogel and aerogel and a preparation method and application thereof. The preparation method of the nano cellulose hydrogel comprises the following steps: (a) pre-treating the cellulose raw material to obtain nano cellulose dispersion liquid; (b) mixing the nano cellulose dispersion liquid with a cross-linking agent to obtain compound dispersion liquid; and (c) freezing and thawing the compound dispersion liquid to obtain the nano cellulose hydrogel. The invention innovatively adopts the freezing and thawing treatment to successfully realize chemical cross-linking of nano cellulose; the product has the characteristics of low grade, high strength, high elasticity, high porosity and thelike and also has the advantages of mild conditions, strong operability and the like; and a feasible method is provided for preparation of nano cellulose gels and has industrialized application prospects.

Description

technical field [0001] The invention belongs to the technical field of cellulose application, and in particular relates to a nano-cellulose hydrogel, an aerogel, a preparation method and application thereof. Background technique [0002] Due to their non-toxic, renewable, and biodegradable properties, chitin or cellulose-based polysaccharide materials have strong advantages in biofunctional materials, and have gradually become a research hotspot around the world. In the process of high-value utilization of cellulose, different from dissolution treatment, nanocellulose has received more and more attention and has become an important aspect of high-value utilization. [0003] Natural cellulose has the characteristics of wide sources, renewable, easy to degrade, green and pollution-free. For the utilization of nanocellulose, hydrogel or aerogel is a good platform product. At present, there are many reports on nanocellulose hydrogel or aerogel, but the existing methods of nanoc...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/02C08J3/24C08L1/02
CPCC08J3/02C08J3/075C08J3/24C08J2301/02
Inventor 范一民刘亮奥莱多·罗杰斯王志国俞娟
Owner NANJING FORESTRY UNIV
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