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Preparation method of magnetic cellulose composite microsphere

A technology of composite microspheres and cellulose, which is applied in the field of functional materials, can solve the problems of complicated post-processing, toxic and harmful, and easy agglomeration of cellulose microspheres, and achieves the effects of simple post-processing, not easy to agglomerate, and simple preparation process.

Inactive Publication Date: 2012-05-30
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The problem to be solved by the present invention is to propose a preparation method of magnetic cellulose composite microspheres based on the prior art. The obtained magnetic cellulose composite microspheres have good dispersibility, simple product post-processing technology, and can realize large-scale and low-cost production. The production and preparation of the cellulose microspheres overcomes the fact that the solvents used in the cellulose microspheres prepared in the prior art are basically toxic and harmful organic solvents. The cellulose microspheres contain residual groups that are prone to agglomeration, and the preparation process and post-treatment of the prepared microspheres are complicated. question

Method used

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  • Preparation method of magnetic cellulose composite microsphere
  • Preparation method of magnetic cellulose composite microsphere

Examples

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Effect test

Embodiment 1

[0024] Pre-cool NaOH / urea aqueous solution to -12°C as a solvent, add cellulose to high-speed stirring to dissolve, and then centrifuge at low speed to remove impurities to obtain a cellulose solution, and add magnetic particles g-Fe according to the embedding rate 2 o 3 into the cellulose solution and vigorously stirred to prepare magnetic cellulose electrostatic injection fluid, the cellulose and magnetic particles g-Fe 2 o 3 The total concentration is 4wt%, the magnetic particles g-Fe 2 o 3 The mass ratio to cellulose is 1:9.

[0025] Stir 10ml of the above-mentioned magnetic cellulose electrostatic injection fluid for 30 minutes, ultrasonically add it into the injection tube of the electrospinning equipment after 10 minutes, and install a 3mm diameter nozzle on the injection tube. and Connect the nozzle to the positive pole of the high-voltage power supply as the anode, use aluminum foil as the conductive plate to connect to the negative pole of the high-voltage power...

Embodiment 2

[0028] Pre-cool NaOH / thiourea water solvent to -5°C as a solvent, add cellulose to high-speed stirring to dissolve, and then centrifuge at low speed to remove impurities to obtain a cellulose solution, and add magnetic particles Fe according to the embedding rate 3 o 4 into the cellulose solution, vigorously stirred to prepare magnetic cellulose electrostatic injection fluid, the cellulose and magnetic particles Fe 3 o 4 The total concentration is 1wt%, the magnetic particles Fe 3 o 4 The mass ratio to cellulose is 3:7.

[0029] Stir 10ml of the above-mentioned magnetic cellulose electrostatic injection fluid for 30 minutes, ultrasonically add it into the injection tube of the electrospinning equipment for 10 minutes, install a nozzle with a diameter of 2mm on the injection tube, and connect the nozzle to the positive pole of the high-voltage power supply as the anode, and use aluminum foil as the anode. The conductive plate is connected to the negative pole of the high-vo...

Embodiment 3

[0031] Pre-cool LiOH / urea aqueous solution to -12°C as a solvent, add cellulose and stir to dissolve at high speed, then centrifuge at low speed to remove impurities to obtain a cellulose solution, and add magnetic particles CoFe according to the embedding rate 2 o 4 into the cellulose solution, vigorously stirred to prepare magnetic cellulose electrostatic injection fluid, the cellulose and magnetic particles CoFe 2 o 4 The total concentration is 0.5wt%, the magnetic particles CoFe 2 o 4 The mass ratio to cellulose is 5:5.

[0032]Stir 10ml of the above-mentioned magnetic cellulose electrostatic injection fluid for 30 minutes, ultrasonically add it into the injection tube of the electrospinning equipment after 10 minutes, install a nozzle with a diameter of 1 mm on the injection tube, and connect the nozzle to the positive pole of the high-voltage power supply as the anode, and use aluminum foil as the anode. The collector is connected to the negative pole of the high-vol...

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Abstract

The invention relates to a preparation method of a magnetic cellulose composite microsphere, comprising the following steps of: (1) taking an alkali / urea solution or / and an alkali / thiourea solution as solvents, then pre-cooling to low temperature, and adding cellulose to be mixed at high speed under the low temperature for dissolution so as to obtain a cellulose solution; (2) adding superparamagnetic magnetic particles into the cellulose solution and violently mixing to prepare magnetic cellulose electrostatic injection fluid; and (3) carrying out electrostatic injection under the function ofa high-voltage electric field to finally form the regenerative magnetic cellulose composite microsphere. The invention has the beneficial effects of: (1) superparamagnetism, uneasy aggregation and even dispersion; (2) capabilities of changing the magnetic response performance of the composite microsphere and changing the technological conditions such as the concentration of macromolecular solution and the electrostatic injection condition to control the shape and size of the microsphere; (3) simple preparation technology; (4) simple post-processing; and (5) large-scale production and preparation with low cost by utilizing the high-voltage electrostatic injection technology.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a preparation method of magnetic cellulose composite microspheres. Background technique [0002] Science and technology in the 21st century have tended towards renewable raw materials, environmentally friendly and sustainable processes and methods. The theme of the 239th Annual Meeting of the American Chemical Society is "Chemistry for a Sustainable World". Attention has been paid to biodegradable and biocompatible materials prepared from renewable resources. Cellulose is one of the most abundant and renewable natural resources on the earth. It is cheap, degradable and does not pollute the environment. Therefore, all countries in the world attach great importance to the research and development of cellulose. Cellulose is composed of cellobiose repeating units via β-(1 4) Linear polymers connected by -D-glycosidic bonds. The hydroxyl groups on each anh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08L1/02C08K3/08C08K3/22
Inventor 喻发全罗晓刚吴元欣
Owner WUHAN INSTITUTE OF TECHNOLOGY