Unlock instant, AI-driven research and patent intelligence for your innovation.

One-step method for preparing acetylated nano-chitin whiskers

A nano-chitin and acetylation technology is applied in the field of one-step preparation of acetylated nano-chitin whiskers, which can solve problems such as the lack of application of acetylated nano-chitin whiskers, and achieve easy reaction control, low temperature and low price. Effect

Active Publication Date: 2022-03-29
NANJING FORESTRY UNIV
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The synthetic raw materials of deep eutectic solvent (DES) are very common compounds, which are rich in sources and cheap, easy to biodegrade, have no environmental side effects, and its preparation process is relatively simple, only a certain molar ratio of quaternary ammonium salt and hydrogen Bond donors are mixed and heated and stirred at a certain temperature until a uniform colorless liquid is formed, and a product with high purity can be obtained without purification. No application yet

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • One-step method for preparing acetylated nano-chitin whiskers
  • One-step method for preparing acetylated nano-chitin whiskers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of deep eutectic solvent: choline chloride and zinc chloride are mixed in a molar ratio of 1:1 and placed in a reaction vessel, and stirred in a water bath at a reaction temperature of 80°C until all become colorless and transparent liquids , to obtain a deep eutectic solvent;

[0023] (2) Mix chitin with the deep eutectic solvent obtained in step (1) at a mass ratio of 1:10, add acetic anhydride of the same mass as chitin at the same time, and continue stirring for 1 hour at a reaction temperature of 80°C to obtain a reaction product;

[0024] (3) After cooling the reaction product obtained in step (2) to room temperature, add distilled water, pour it into a centrifuge tube, and centrifuge for 5 minutes at a speed of 4000r / min, and collect the supernatant and sediment respectively;

[0025] (4) Continue to add distilled water to the precipitate in step (3) and wash repeatedly for several times until the supernatant is neutral to obtain the final washed...

Embodiment 2

[0029] (1) Preparation of deep eutectic solvent: choline chloride and zinc chloride are mixed in a molar ratio of 1:2 and placed in a reaction vessel, and stirred in a water bath with a reaction temperature of 80°C until all become colorless and transparent liquids , to obtain a deep eutectic solvent;

[0030] (2) Chitin is mixed with the deep eutectic solvent obtained in step (1) in a mass ratio of 1: 50, and acetic anhydride of the same mass as chitin is added simultaneously, and the reaction temperature is 90° C. and continuously stirred for 3 hours;

[0031] (3) After cooling the reaction product obtained in step (2) to room temperature, add distilled water, pour it into a centrifuge tube, and centrifuge for 5 minutes at a speed of 4000r / min, and collect the supernatant and sediment respectively;

[0032] (4) Continue to add distilled water to the precipitate in step (3) and repeatedly wash it several times until the supernatant is neutral to obtain the final washed precip...

Embodiment 3

[0036] (1) Preparation of deep eutectic solvent: choline chloride and zinc chloride are mixed in a molar ratio of 1:3 and placed in a reaction vessel, and stirred in a water bath with a reaction temperature of 100°C until all become colorless and transparent liquids , to obtain a deep eutectic solvent;

[0037] (2) Chitin is mixed with the deep eutectic solvent obtained in step (1) in a mass ratio of 1: 100, while adding acetic anhydride of the same mass as chitin, and continuously stirring for 6 hours when the reaction temperature is 110° C.;

[0038] (3) After cooling the reaction product obtained in step (2) to room temperature, add distilled water, pour it into a centrifuge tube, and centrifuge for 5 minutes at a speed of 4000r / min, and collect the supernatant and sediment respectively;

[0039] (4) Continue to add distilled water to the precipitate in step (3) and wash repeatedly for several times until the supernatant is neutral to obtain the final washed precipitate, wh...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing acetylated nano-chitin whiskers in one step. The steps are: mixing choline chloride and zinc chloride in a certain proportion into a reaction vessel, heating and stirring until transparent to obtain a deep eutectic solvent (DES) . Then add chitin into DES according to a certain mass ratio, and add acetic anhydride or acetic acid as acetylation modifier at the same time, heat and stir for a period of time, then cool down and centrifuge at the set speed and time in a high-speed centrifuge, and wash with water repeatedly To neutrality, the precipitated part is subjected to ultrasonic treatment to obtain acetylated chitin nano whiskers, and the supernatant is obtained by rotary evaporation to recover DES. Its characteristic is that by virtue of the synergistic effect of DES and acetic acid or acetic anhydride, chitin is hydrolyzed and esterified under normal pressure, and acetylated nano-chitin whiskers are prepared in one step. , and at the same time, the deep eutectic solvent can be recycled and reused to reduce environmental pollution and energy consumption.

Description

technical field [0001] The invention relates to the field of chemical industry application, in particular to a method for preparing acetylated nano-chitin whiskers in a one-step method in a deep eutectic solvent. Background technique [0002] Chitin has the properties of wide sources, biodegradability, biocompatibility, non-toxicity and low antigenicity, and is widely used in food industry, environmental protection, medicine, agriculture, textile, functional materials and other fields. However, chitin is insoluble in water and most organic solvents and exists in the form of precipitation, thus limiting its application. However, nano-sized chitin can be uniformly dispersed in water, and the dispersion liquid is easy to handle and form. Therefore, nano-sized chitin can be prepared from chitin by appropriate chemical or physical treatment, referred to as nano-chitin. Nano-chitin includes chitin nano-whiskers and chitin nano-fibers. Chitin nanowhiskers usually have pointed rod...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08
CPCC08B37/003
Inventor 洪枢连海兰袁杨
Owner NANJING FORESTRY UNIV