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Cellulose acetate propionate microspheres and preparation method thereof

A technology of cellulose acetate propionate and cellulose, which is applied in the field of polymer material chemistry, can solve the problems of few research reports on cellulose acetate propionate microspheres, and achieve the advantages of selective adsorption and separation, widening application fields, good The effect of mechanical properties

Inactive Publication Date: 2014-08-20
广西弘耀祥科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although cellulose acetate propionate has been industrialized, there are few research reports on cellulose acetate propionate microspheres except for a few patents on the preparation of cellulose acetate propionate films.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Accurately weigh 1.0 g of cellulose, add it into a beaker containing 50 mL of ionic liquid, place the beaker in a water bath at 60 °C, and stir at a low speed for 5 h to completely dissolve the cellulose to obtain a cellulose solution. Then add M to the beaker 1 = 2 propionic anhydride and M 2 =2 acetic anhydride mixed liquor and cellulose solution carry out esterification (wherein, M 1 , M 2 are respectively the molar ratios of propionic anhydride and acetic anhydride to the repeating unit of cellulose glucose), the esterification reaction temperature is 40° C., and the reaction is carried out for 3 hours while stirring at a low speed. After the reaction finishes, this mixed solution is dispersed in the oil phase whose volume is 4 times its volume, the oil phase is made up of Span80 emulsifier and 300# liquid paraffin, and the volume ratio of Span80 and liquid paraffin is 1: 50, will react The device is placed in a water bath at 70°C and stirred at a speed of 900r / m...

Embodiment 2

[0022] Accurately weigh 1.5 g of cellulose, add it into a beaker containing 50 mL of ionic liquid, place the beaker in a water bath at 70 °C, and stir at a low speed for 6 h to completely dissolve the cellulose to obtain a cellulose solution. Then add M to the beaker 1 = 3 propionic anhydride and M 2 =2 acetic anhydride mixed liquor and cellulose solution carry out esterification (wherein, M 1 , M 2are respectively the molar ratios of propionic anhydride and acetic anhydride to the repeating unit of cellulose glucose), the esterification reaction temperature is 50° C., and the reaction is carried out for 2 hours while stirring at a low speed. After the reaction finishes, this mixed solution is dispersed in the oil phase whose volume is 5 times of its volume again, and oil phase is made up of Span80 emulsifier and 300# liquid paraffin, and the volume ratio of Span80 and liquid paraffin is 1: 100, will react The device is placed in a water bath at 60°C and stirred at a speed ...

Embodiment 3

[0024] Accurately weigh 2.0 g of cellulose, add it into a beaker containing 50 mL of ionic liquid, place the beaker in a water bath at 80 °C, and stir at a low speed for 7 h to completely dissolve the cellulose to obtain a cellulose solution. Then add M to the beaker 1 = 4 propionic anhydride and M 2 =3 acetic anhydride mixed solution and cellulose solution carry out esterification (wherein, M 1 , M 2 are respectively the molar ratios of propionic anhydride and acetic anhydride to the repeating unit of cellulose glucose), the esterification reaction temperature is 60° C., and the reaction is carried out for 1 h while stirring at a low speed. After the reaction finishes, this mixed solution is dispersed in the oil phase whose volume is 8 times of its volume again, and oil phase is made up of Span80 emulsifier and 300# liquid paraffin, and the volume ratio of Span80 and liquid paraffin is 1: 200, will react The device is placed in a water bath at 50°C and stirred at a speed o...

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Abstract

The invention relates to a preparation method of cellulose acetate propionate microspheres by an ionic liquid as a solvent. The preparation method utilizes a homogeneous esterification method to realize cellulose acetate propionate synthesis and realizes cellulose acetate propionate regeneration thereby producing the cellulose acetate propionate microspheres. The preparation method comprises the following steps of dissolving cellulose in an ionic liquid to obtain a cellulose solution, carrying out a process of a reaction of a propionic anhydride-acetic anhydride mixed solution and the cellulose solution, dispersing the above mixed solution into an oil phase, coagulating the cellulose solution by reversed phase suspension and programmed freezing to obtain cellulose solution drops, adding a curing agent into the cellulose solution drops for curing the cellulose solution drops so that cellulose microspheres are formed, after the reaction, carrying out solid-liquid phase centrifugation to obtain the cellulose acetate propionate microspheres and recovering the ionic liquid. The cellulose acetate propionate microspheres have regular spherical shapes, an acetyl substitution degree of cellulose acetate propionate is in a range of 0.02-0.5 and a propionyl substitution degree is in a range of 0.03-0.4, good mechanical properties, good thermostability and acid and alkali resistance are obtained, and the cellulose acetate propionate microspheres can be used for separation purification of biomacromolecule proteins and can also be used as a carrier of an enzyme or other biomaterials.

Description

technical field [0001] The invention relates to a preparation method of cellulose acetate propionate microspheres, belonging to the field of polymer material chemistry. Background technique [0002] Polymer microspheres refer to polymer materials with particle sizes ranging from nanometers to micrometers and spherical or other geometric shapes. Due to their special size and special structure, microspheres play a special and key role in many important fields. Microspheres with different particle sizes and shapes have different functions and uses. Polymer microspheres mainly have the following functions: micro-memory, micro-reactor, micro-separator and micro-structural unit. Their applications involve almost all fields, from general industrial applications to high-tech fields, such as biochemical fields, medical And the field of medicine, electronic information, etc. The application research of polymer microspheres in the fields of biochemical engineering and medical enginee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C08J3/03C08L1/14C08B3/16
Inventor 林成刚宋洪浪梁涛王则奋倪海明万思杰黄科林蔡广超贾艳桦覃宁波柳春蓝丽
Owner 广西弘耀祥科技有限公司
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