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Novel method for preparing super-macroporous cellulose microspheres

A technology of cellulose microspheres and a new method, applied in the field of materials, can solve the problems that the template method is easy to generate closed pores, difficult to build large pores, and the preparation process is cumbersome, etc., and achieves the effects of large application potential, low cost, and easy availability of raw materials.

Pending Publication Date: 2020-10-02
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have their own disadvantages. Phase separation is difficult to construct large pores that can perfuse mass transfer; template method is easy to produce closed pores; double emulsion method has cumbersome preparation process and low ball formation rate.

Method used

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  • Novel method for preparing super-macroporous cellulose microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 5g of cellulose in NaOH / urea solution to form a transparent colorless cellulose solution with a concentration of 4~6wt%; after centrifuging and degassing the resulting solution, take 20mL of this solution as the dispersed phase, mix 1.5g of Span80 and 1g of Tween60 Add it to 60mL white mineral oil and add it as the continuous phase, and use the emulsification method to prepare an emulsion containing cellulose droplets; place the emulsion at 25°C for 10 hours, and at the same time perform magnetic stirring at 1500 rpm; heat the emulsion obtained in the previous step to 70 ℃ or adding 5% acidic solution to prepare regenerated cellulose microspheres.

Embodiment 2

[0026] Dissolve 5g of microcrystalline cellulose in -5°C sodium hydroxide / urea 95mL solution to obtain a transparent and colorless viscose solution; after centrifuging and degassing the obtained solution, use a syringe to draw 1mL of this solution as a dispersed phase, and fix it in the injection Pump, use a syringe to absorb 5mL white mineral oil and add surfactants 0.25gSpan80 and 0.15gTween60 as the continuous phase, fix it on another syringe pump, use a T-shaped microfluidic device, and place the liquid outlet in 50mL of 5% Span80 In the white mineral oil solution, the emulsion containing cellulose droplets with different particle sizes was prepared by adjusting the two-phase flow rate; the emulsion was placed in an environment of 20 ° C for 8 hours, and magnetic stirring was performed at 2000 rpm at the same time; then 5% acidic solution was added to prepare regenerated cellulose microspheres.

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Abstract

The invention relates to a novel method for preparing super-macroporous cellulose microspheres, and belongs to the technical field of materials. The preparation method comprises the following steps: dissolving cellulose in an alkaline solvent, with the solution as a dispersion phase and white mineral oil as a continuous phase, preparing a cellulose emulsion, in the emulsification process of the cellulose solution, regulating the ratio of the water-soluble surfactant to the oil-soluble surfactant so as to control the interfacial tension of the cellulose solution and the oil phase, so that the oil phase and the cellulose solution form a continuous phase penetrating through each other, and the super-macroporous cellulose microspheres are obtained by curing. Results show that the cellulose microspheres prepared by adopting the preparation method have super-macroporous and microporous structures at the same time, micropores can provide a large surface area, and super-macroporous can promotea medium to quickly enter internal pore passages of the cellulose microspheres, so that the treatment efficiency is improved. Meanwhile, the method is simple in process, easy for industrial production, wide in raw material source, easy to degrade and non-toxic, and has huge application potential in the fields of separation, catalysis, energy and the like.

Description

technical field [0001] The invention belongs to the technical field of materials and relates to a new preparation method of super-macroporous cellulose microspheres. Background technique [0002] Cellulose is the most abundant biomass resource on earth, and plants can produce more than billions of tons per year, so this polysaccharide is the most abundant organic compound in nature. Cellulose is a straight-chain polysaccharide composed of β-D-glucosyl through 1-4 glycosidic bonds, and is rich in hydroxyl groups, which provides a basis for further modification of cellulose. At the same time, combined with its own excellent biodegradability, biocompatibility, non-toxicity and other characteristics, it is an ideal biomass material that is easy to be functionalized. The good application prospect has attracted the attention of a large number of researchers. [0003] Cellulose microspheres are one of the most widely used types of cellulose materials, and have been commercialized...

Claims

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Application Information

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IPC IPC(8): C08J3/16C08J9/00C08L1/02C08L1/04
CPCC08J3/16C08J9/00C08J2301/02C08J2301/04
Inventor 杜开峰乔亮智
Owner SICHUAN UNIV
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