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Preparation of Cellulose Nanofiber Airgel Microspheres by Ultrasonic Atomization

A nanofiber and ultrasonic technology, which is applied in the field of preparing cellulose nanofiber airgel microspheres by ultrasonic atomization, can solve the problems of uneven particle size distribution, limit the application of microspheres, and affect the application of microspheres, and achieve uniform distribution , Good void structure uniformity, high water absorption effect

Active Publication Date: 2017-03-01
LIANSHENG PAPER IND LONGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The particle size of the balls formed by the traditional method is as large as hundreds of microns, as small as tens of microns, and the particle size distribution is not uniform, which seriously affects the application of microspheres in many fields.
[0005] 2. The traditional "sol-gel ball-drying" method is complicated to operate, takes up to several days, and the process is unstable
[0006] 3. The traditional method first needs to prepare cellulose solution. Most cellulose organic solvents are highly toxic and limit the application of microspheres in the field of medicine.

Method used

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  • Preparation of Cellulose Nanofiber Airgel Microspheres by Ultrasonic Atomization
  • Preparation of Cellulose Nanofiber Airgel Microspheres by Ultrasonic Atomization
  • Preparation of Cellulose Nanofiber Airgel Microspheres by Ultrasonic Atomization

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Embodiment 1

[0031] Preparation of TEMPO Oxidized Nanocellulose Suspension (TOCN): After the bleached coniferous wood pulp board was thawed, under the pulp concentration of 1.5wt%, by adding TEMPO (0.016g / g absolute dry pulp), sodium hypochlorite (20mmol / g absolute Dry pulp), sodium bromide (0.16g / g dry pulp), reacted for 2h under the condition of pH10.5, the carboxyl content was measured at 1.82mmol / g dry pulp. The oxidized slurry was ultrasonically dissociated (Ultrasonics FS-300; 8 min) to prepare a cellulose nanofiber suspension, and the concentration of the suspension was controlled at 0.8 wt%.

[0032] Preparation of chemically crosslinked cellulose nanofiber airgel microspheres: Pour about 150ml of cellulose nanofiber suspension with crosslinking agent (polyamide epichlorohydrin resin, 5% g / g dry pulp) into medical In the atomization cup of the ultrasonic nebulizer (Yuwell, 420AI, power 1.7MHz±10%). The atomized TEMPO oxidized cellulose nanofiber droplets are blown into a container...

Embodiment 2

[0034] Preparation of TEMPO oxidized nanocellulose suspension (TOCN): After the bleached coniferous wood pulp board was decomposed, under the pulp concentration of 0.8wt%, by adding TEMPO (0.01g / g absolute dry pulp), sodium hypochlorite (15mmol / g absolute dry pulp), sodium bromide (0.10g / g dry pulp), and reacted for 3h under the condition of pH9. The oxidized slurry was ultrasonically dissociated (Ultrasonics FS-300; 5 min) to prepare a cellulose nanofiber suspension, and the concentration of the suspension was controlled at 0.3 wt%.

[0035] Preparation of chemically cross-linked cellulose nanofiber airgel microspheres: add about 150ml of cellulose nanofiber suspension with cross-linking agent (polyamide epichlorohydrin resin, 1% g / g dry pulp) into medical In the atomization cup of the ultrasonic nebulizer (Yuwell, 420AI, power 1.7MHz±10%). The atomized TEMPO oxidized cellulose nanofiber droplets are blown into a container filled with liquid nitrogen through an airflow. The...

Embodiment 3

[0037] Preparation of TEMPO oxidized nano-cellulose suspension (TOCN): after the bleached coniferous wood pulp board is thawed out, under the pulp concentration of 2wt%, by adding TEMPO (0.02g / g dry pulp), sodium hypochlorite (25mmol / g dry pulp) pulp), sodium bromide (0.20g / g dry pulp), and reacted for 4h under the condition of pH11. The oxidized slurry was ultrasonically dissociated (Ultrasonics FS-300; 10 min) to prepare a cellulose nanofiber suspension, and the concentration of the suspension was controlled at 1.2 wt%.

[0038]Preparation of chemically crosslinked cellulose nanofiber airgel microspheres: add about 150ml of cellulose nanofiber suspension with crosslinking agent (polyamide epichlorohydrin resin, 7% g / g dry pulp) into medical In the atomization cup of the ultrasonic nebulizer (Yuwell, 420AI, power 1.7MHz±10%). The atomized TEMPO oxidized cellulose nanofiber droplets are blown into a container filled with liquid nitrogen through an airflow. Then the quick-fro...

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Abstract

The invention discloses a technique for preparing cellulose nano fiber aerogel microspheres by ultrasonic atomization. The technique comprises the following steps: defibering bleached coniferous wood sheet pulp, adding tetramethyl piperidine oxide, sodium hypochlorite and sodium bromide, and carrying out oxidation reaction for 2-4 hours under the pH value of 9.5-11; carrying out ultrasonic dissociation on the oxidated pulp to prepare a cellulose nano fiber suspension; and adding a crosslinking agent into the cellulose nano fiber suspension, pouring into an atomization cup of an ultrasonic atomizer, blowing the atomized oxidated nano cellulose fog drops containing the crosslinking agent and tetramethyl piperidine oxide into a liquid-nitrogen-filled container, carrying out freeze-drying on fast-frozen ice microspheres, and finally, carrying out crosslinking reaction on the dried aerogel microspheres at 110-130 DEG C for 2-4 hours, thereby obtaining the cellulose nano fiber aerogel microspheres.

Description

technical field [0001] The invention belongs to the technical field of cellulose airgel microspheres, and in particular relates to a process for preparing cellulose nanofiber airgel microspheres by an ultrasonic atomization method. Background technique [0002] Cellulose is the most abundant natural polymer in nature, which is non-toxic, biodegradable, cheap and recyclable. Airgel is a porous and ultra-light material prepared by replacing the cellulose solvent with gas without changing its internal structure. Compared with traditional inorganic material aerogels, cellulose airgel not only has the characteristics of degradability and non-toxicity, but also has good ductility and mechanical strength. As a special structure of airgel, airgel microspheres have been reported to be used in drug loading, tissue engineering scaffolds, cell culture, selective separation, and wound care. Due to its special mechanical properties, cellulose airgel is difficult to form into balls by si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/24C08B15/02C08L1/04
CPCC08B15/02C08J3/247C08J9/28C08J2301/04
Inventor 童国林张放任浩窦靖
Owner LIANSHENG PAPER IND LONGHAI
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