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A kind of functionalized cellulose nanoparticle and its preparation method and application

A nanoparticle and cellulose technology, applied in the field of polymer chemistry, achieves the effect of broad application prospects, good thermal stability and short cycle

Active Publication Date: 2019-06-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The applicant of the present invention is committed to the research of cellulose modification, and found that in the prior art, there is no report on the preparation of cellulose nanoparticles by using regenerated cellulose airgel or hydrogel as a matrix and using lactic acid as a functional monomer

Method used

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  • A kind of functionalized cellulose nanoparticle and its preparation method and application
  • A kind of functionalized cellulose nanoparticle and its preparation method and application
  • A kind of functionalized cellulose nanoparticle and its preparation method and application

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preparation example Construction

[0063] The invention provides a method for preparing functionalized cellulose nanoparticles, comprising the following steps:

[0064] 1) The regenerated cellulose hydrogel / aerogel with a three-dimensional network structure and the functional monomer lactic acid are stirred at 20-90°C for 0-48 hours under normal pressure, so that the functional monomer can fully penetrate into the regenerated cellulose water The inside of the gel / aerogel, so that the monomer and the regenerated cellulose hydrogel / aerogel are fully mixed (this step is to further improve the efficiency of its functional modification); wherein, the regenerated cellulose The cellulose content in the hydrogel / aerogel is 1wt% to 4wt% of the amount of functional monomers; in the present invention, the monomers used are capable of penetrating into the regenerated cellulose aerogel and the interior of the hydrogel , as much as possible in the liquid phase, thus avoiding the disadvantages of introducing organic solvents ...

Embodiment 1

[0075] The preparation of embodiment one regenerated cellulose hydrogel

[0076] (1) Microcrystalline cellulose adopts the method for dissolving at low temperature to prepare a clear and transparent cellulose solution with a mass fraction of 4%;

[0077] (2) Take 2ml of the cellulose solution and add it to a 12-hole bacterial culture plate, and let it stand for 3 hours at a gel temperature of 60° C. to prepare a cellulose gel;

[0078] (3) Repeatedly soaking the obtained cellulose gel with deionized water until the aqueous solution becomes neutral to obtain regenerated cellulose hydrogel.

Embodiment 2

[0079] The preparation of embodiment two regenerated cellulose airgel

[0080] (1) Microcrystalline cellulose adopts the method for dissolving at low temperature to prepare a clear and transparent cellulose solution with a mass fraction of 4%;

[0081] (2) Take 2ml of the cellulose solution and add it to a 12-hole bacterial culture plate, and let it stand for 3 hours at a gel temperature of 60° C. to prepare a cellulose gel;

[0082] (3) Soak the obtained cellulose gel repeatedly with deionized water until the aqueous solution is neutral to obtain a regenerated cellulose hydrogel, and then place the obtained regenerated cellulose hydrogel in an environment of -170° C. for 1 to 2 minutes, Then put it in a freeze dryer for freeze-drying to obtain the regenerated cellulose airgel; the drying conditions are: 50Pa, -50°C, 12 hours.

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Abstract

The invention relates to a simple and efficient method for preparing functionalized cellulose nanoparticles, which belongs to the field of polymer chemistry. The invention provides a preparation method of functionalized cellulose nanoparticles, the method comprising: 1) thoroughly mixing regenerated cellulose hydrogel / aerogel and functional monomer lactic acid; 2) removing water from the reaction system; 3) adding a catalyst and mixing under normal pressure for 0.2 to 1 hour; 4) obtaining a reaction product through melt co-polycondensation; 5) purifying the reaction product to obtain a functionalized cellulose nanoparticle precursor, and then dissolving the functionalized precursor Disperse in an organic solvent, and ultrasonically treat for 0.5 to 2 hours to obtain functionalized cellulose nanoparticles. The preparation method of functionalized cellulose nanoparticles in the present invention avoids a series of complicated operations such as high-pressure homogenization, hydrolysis, enzymolysis, solvent exchange, centrifugal purification, dialysis, etc., and has simple preparation conditions, short cycle and low cost.

Description

technical field [0001] The invention relates to a simple and efficient method for preparing functionalized cellulose nanoparticles, which belongs to the field of polymer chemistry. Background technique [0002] With the rapid development of industrial production technology, environmental problems have become more and more serious. It has become a trend of technological development to use natural renewable resources instead of non-renewable fossil energy to prepare environmentally friendly green degradable products. Cellulose is a natural polymer abundant in nature, green and biodegradable, which just meets this demand. In this field, nanocellulose not only combines the basic properties of cellulose (good chemical modification ability, low density, excellent mechanical properties, etc.), but also has the advantages of nanomaterials (high specific surface area, outstanding enhanced capabilities), and thus has attracted widespread attention. However, the surface energy of nan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08J3/09C08L1/08C08B15/00C08G63/08C08J9/26C08J3/075
CPCC08B15/00C08G63/08C08J3/075C08J3/09C08J3/12C08J9/26C08J2201/0484C08J2205/026C08J2301/02C08J2301/08
Inventor 刘正英王捍卿杨鸣波杨伟谭黄
Owner SICHUAN UNIV
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