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Preparation method of cellulose microsphere

A technology of cellulose microspheres and cellulose, which is applied in the field of polymer chemistry, can solve the problems of a large amount of waste liquid, waste gas and waste, cellulose bead pollution, and limited application, and achieve good mechanical properties, good flow properties, and uses wide range of effects

Inactive Publication Date: 2011-09-14
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of preparing cellulose spheres with traditional viscose, a large amount of waste liquid, waste gas and waste materials are produced, causing serious pollution to the environment.
Moreover, most of the prepared cellulose beads contain residual groups or are polluted by their own solvents, which limits their application in biology and medicine.

Method used

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  • Preparation method of cellulose microsphere
  • Preparation method of cellulose microsphere
  • Preparation method of cellulose microsphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Pre-cool NaOH / urea aqueous solution to -12°C as solvent to dissolve cellulose to prepare cellulose solution, add 300ml kerosene and transformer oil mixed solvent, and 3ml Twin-80 / Span -80 composite emulsifier, after stirring evenly, slowly add 100ml of the above-prepared cellulose solution, complete the addition within 60min, control the stirring speed to 200r / min, and emulsify at room temperature for 30min. Keep the same conditions and continue to pre-cure for 1 hr, then add dilute acid to acidify the pH to neutral to regenerate the cellulose. Stop stirring, leave standstill layering, upper strata is organic solvent, and lower stratum is aqueous phase, and cellulose particle is precipitated in lower stratum. Pour out the upper organic phase, which can be directly recycled, remove the water phase, decant and wash the cellulose particles with distilled water for several times, soak and wash with 10% ethanol aqueous solution for 3 to 5 times to obtain cellulose microspher...

Embodiment 2

[0021] Pre-cool NaOH / urea aqueous solution to -12°C as a solvent to dissolve cellulose to prepare a cellulose solution. Add 300ml of liquid paraffin and 9ml of Span-80 into a 500ml three-neck flask equipped with a condensation reflux device and a constant temperature water bath. After stirring evenly, slowly add Add 50ml of the above-prepared cellulose solution within 30 minutes, control the stirring speed to 800r / min, and emulsify at room temperature for 30 minutes. Keep the same conditions and continue to pre-cure for 1 hr, then add 10% hydrochloric acid dropwise to acidify to pH close to neutral to regenerate cellulose. Stirring was stopped, and the layers were left to stand, the upper layer was an organic solvent, the lower layer was an aqueous phase, and the cellulose particles were precipitated in the lower layer. Pour out the upper organic phase, which can be directly recycled, remove the water phase, decant and wash the cellulose particles with distilled water for seve...

Embodiment 3

[0024] Pre-cool NaOH / urea aqueous solution to -12°C as solvent to dissolve cellulose to prepare cellulose solution, add 300ml 200# liquid paraffin and 30ml Span-80 and potassium oleate compound emulsification in a 500ml three-neck flask equipped with a condensation reflux device and a constant temperature water bath After stirring evenly, slowly add 30ml of the above-prepared cellulose solution, complete the addition within 15min, control the stirring speed to 1000r / min, and emulsify at room temperature for 30min. Keep the same conditions and continue to pre-cure for 4 hours, then add 10% dilute acidification dropwise until the pH is neutral to regenerate the cellulose. Stirring was stopped, and the layers were left to stand, the upper layer was an organic solvent, the lower layer was an aqueous phase, and the cellulose particles were precipitated in the lower layer. Pour out the upper organic phase, which can be directly recycled, remove the water phase, decant and wash the c...

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Abstract

The invention discloses cellulose microsphere, and a preparation process and the application. The cellulose microsphere is prepared through dispersing cellulose solution in organic solvent which comprises emulsifier or composite emulsifier, solidifying in constant temperature for 1-10hr to shape after stirring to evenly disperse drops, then adding diluted acid to make cellulose regenerate into microsphere, standing and stratifying, filtering to obtain cellulose particles, finally obtaining cellulose microsphere after decantation. The solution of cellulose and the preparation of cellulose microsphere are physical processes without chemical reaction. The whole preparation technology is simple, has short time consumption, and organic solvent can be repeatedly used. The process has low devicedemand, which is convenient for industrial production. The cellulose microsphere which is prepared through adopting the process has favorable mechanical property, excellent flow-ability, heat stability and swelling resistance property, oxidation resistance ability, biodegrability resistance and acidic and alkali degradation capability, and has extensive usage.

Description

technical field [0001] The invention relates to a cellulose microsphere, a preparation method and application thereof, and belongs to the field of polymer chemistry. Background technique [0002] Cellulose is the most abundant and recoverable natural resource 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. [0003] Cellulose is a linear polymer composed of cellobiose repeating units connected by β-(1→4)-D-glycosidic bonds, and the hydroxyl groups on each anhydroglucose unit are located at C-2, C-3 and C- The 6 position has the typical reaction properties of primary and secondary alcohols, and can undergo a series of chemical modifications to prepare functional polymer materials for different purposes. The development and application of cellulose adsorbents and ion exchangers began in the early 1950s. At present, there are many brands and se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/00C08J9/00C08L1/02C12N11/04B01J20/24B01J20/28B01J20/30A61M1/38G01N21/00G01N33/52
Inventor 张俐娜罗晓刚周金平
Owner WUHAN UNIV