Cellulose microsphere with uniform size, and preparation method thereof

A technology of cellulose microspheres and uniform size, applied in the field of cellulose processing, can solve the problems of irregular shape of microspheres, uneven structure, limited application, etc., and achieve narrow particle size distribution, wide application range and high concentration. Effect

Active Publication Date: 2019-01-25
武汉水木弘新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the preparation process is simple, and the disadvantage is that due to the influence of solid-liquid surface tension during the curing process, the shape of the microspheres is irregular, the structure is uneven and easy to agglomerate, which limits its application in related fields.

Method used

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  • Cellulose microsphere with uniform size, and preparation method thereof
  • Cellulose microsphere with uniform size, and preparation method thereof
  • Cellulose microsphere with uniform size, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036]Prepare 8 kg of cellulose solution with a mass fraction of sodium hydroxide of 7.0% and a mass fraction of cellulose of 4.5%. The cellulose solution is transported to a high-speed rotary centrifugal spray dryer (manufactured by Changzhou Jiateng Drying and Granulating Equipment Co., Ltd., model LPG-5) for spray solidification, and the diameter of the atomized droplets is 0.4 μm-200 μm. The diameter of the centrifugal disc of the high-speed rotary centrifugal spray dryer is 60mm, the peripheral speed of the centrifugal disc is 130m / s, the temperature of the hot air inlet is set at 160°C, the spray volume is 5kg / h, and the weight of the solidified particles is 0.95kg. Soak the particles in water and dehydrate them. After repeated 4 times, take the leaching water and test its pH to 7.2 (indicating that the alkali has been washed), otherwise continue washing. Add the washed particles into 0.9kg of water, mix it into a uniform suspension at a stirring speed of 300r / min, and i...

Embodiment 2

[0043] It is 95kg that the mass fraction of sodium hydroxide is 7.8%, the cellulose solution that cellulose mass fraction is 6.2%. The cellulose solution is sent to a high-speed rotary centrifugal spray dryer for spray curing, and the diameter of the atomized droplets is 0.4 μm-200 μm. The diameter of the centrifugal disc of the high-speed rotary centrifugal spray dryer is 120mm, the peripheral speed of the centrifugal disc is 115m / s, the temperature of the hot air inlet is set at 128°C, the spray volume is 50kg / h, and the weight of the solidified particles is 12.4kg. Soak the particles in water and dehydrate them. After repeating this 4 times, take the rinsing water and measure the pH until it reaches 7.5 (indicating that the alkali has been washed), otherwise continue washing. Add the particles into 10kg of water, mix it into a uniform suspension at a stirring speed of 200r / min, and immediately transfer the suspension to the above-mentioned high-speed rotary centrifugal spra...

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Abstract

The invention relates to a cellulose microsphere with uniform size, and a preparation method thereof. The preparation method comprises: atomizing cellulose dissolved in an alkali solution into small liquid droplets, making the small liquid droplets contact a high-temperature hot gas flow to cure, washing, and drying to obtain the regular spherical particles with uniform size and highly concentrated particle size distribution. With the method of the present invention, the influence of the surface tension of the traditional curing agent solution on the shape and the structure of the microsphereparticles is avoided, the addition of the emulsifier is not required during the preparation of the cellulose solution, the product contains less impurities, and the cost is low, such that the method is suitable for industrialization.

Description

technical field [0001] The invention relates to the technical field of cellulose processing, in particular to a cellulose microsphere with uniform size and a preparation method thereof. Background technique [0002] The annual global plastic production is about 300 million tons, and it is growing at a rate of 20 million tons per year. As a direct result of the huge consumption of plastic in modern society, plastic waste accumulates rapidly and is eventually transferred to the ocean through rivers. The biodegradability of plastic polymers is very low, and they can exist in the natural environment for hundreds of thousands of years. The resulting marine plastic litter has become one of the most serious environmental pollution problems. [0003] Plastic microspheres are a kind of polymer particles, common materials are polyethylene (PE), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polypropylene (PP) and so on. For marine organisms, plastic microspheres a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L1/02
CPCC08J3/12C08J2301/02Y02E60/14
Inventor 段煌
Owner 武汉水木弘新材料有限公司
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