Method for preparing chitin nanofibre by using shrimp and crab shells

A technology of nanofibers and shrimp and crab shells, applied in the direction of cleaning methods using liquids, chemical characteristics of fibers, cleaning methods and utensils, etc., can solve the problems of not being effectively used, and achieve high transparency, good mechanical properties, and optical transparency Good results

Active Publication Date: 2013-10-09
SHANDONG LVSEN WOOD PLASTIC COMPOSITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a lot of chitin is discarded as indust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example of chemical treatment of shrimp and crab shells under neutral conditions (pH=7)

[0021] (1) Take an appropriate amount of crushed powder from discarded shrimp and crab shells, screen out 10 g of a 60-mesh sample, and after drying, add 200 ml of hydrochloric acid solution with a mass fraction of 7% and soak for 24 h at room temperature to remove calcium carbonate in the powder (2) Rinse with distilled water until the pH is 7, drain the water by vacuum filtration for use, prepare 200ml of potassium hydroxide solution with a mass fraction of 5%, immerse and stir the above-mentioned samples for 6 hours, and rinse with distilled water Add 5% potassium hydroxide to soak until the suspension is neutral. This process needs to be repeated four times to completely remove residual protein in the sample; (3) Prepare 200 ml of ethanol solution with a mass fraction of 95%, soak the obtained sample , the experimental condition is to treat at room temperature for 12 h, the pur...

Embodiment 2

[0023] Example of chemical treatment of shrimp and crab shells under acidic conditions (pH=3)

[0024] (1) Rinse the shrimp and crab shells, and then use a pulverizer to crush the large pieces of shells into smaller powders; (2) Weigh 30g of shrimp and crab shell powder into a 600ml beaker, and prepare a concentration of 5% Soak 600 ml of hydrochloric acid solution at normal temperature and pressure for 24 hours. After soaking for 24 hours, use a vacuum filter to filter and wash with distilled water until neutral; (3) Prepare 600 ml of 6% sodium hydroxide solution, pour it into the hydrochloric acid Soak the soaked powder for 12 hours at normal temperature and pressure, and change the sodium hydroxide solution every 12 hours, repeating 4 times, the purpose is to completely remove the protein in chitin; (4) Do the same after soaking in sodium hydroxide Filtrate and wash with water until neutral, then use 95% absolute ethanol for decolorization; change the ethanol solution every...

Embodiment 3

[0026]Method for preparing chitin nanofibers only by grinding with stone mortar grinder

[0027] Preparation of chitin nanofibers from shrimp shells or crab shells specifically includes: (1) weighing 6 g of chitin prepared from shrimp shells or chitin prepared from crab shells to form a solution with a concentration of 1%; (2) sequentially After grinding, during the grinding process, slowly touch the grinding disc; (3) Pour chitin solution at a speed of 1500 r / min.

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PUM

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Abstract

The invention discloses a method for preparing a chitin nanofibre optical transparent film by using shrimp and crab shells. The method is characterized by comprising the following two steps of: chemical treatment and mechanical treatment. The method has the advantages that the method can be used for garbage treatment, i.e., the shrimp and crab shells as kitchen wastes polluting the environment are used as raw materials for preparing a high-performance optical transparent material so that higher value application is realized; (2) the prepared nanofilm has the characteristics of good mechanical property, high transparency, low coefficient of thermal expansion and the like, and the diameter of nano-crystalline cellulose is lower than the wavelength range of visible light, and the nanofiber film is good in optical transparency, so that the nanofibre film and other resin composite materials can be used as windable flexible electronic devices such as a flexible display, electronic paper, a solar cell, a flexible circuit, a substitute of a glass substrate and the like. The method is wide in application prospect.

Description

technical field [0001] The invention relates to a method for preparing chitin nanofibers from shrimp and crab shells, which belongs to the field of natural polymers, and also belongs to the fields of chemistry, biological engineering and new materials. technical background [0002] With the increase of freshwater and seawater crab aquaculture products in my country, there are a large number of by-products of crab shells every year, only a small part of which is used for low-value products such as feed additives, and most of them are treated as garbage, which pollutes the environment and causes A waste of resources. If it is recycled to produce high value-added chitin nanofibers, it will not only turn waste into treasure, but also obtain considerable economic benefits. As the second most abundant natural organic polymer compound in the world, chitin has also been studied for a long time. Chitin can be obtained from shrimps, crabs, and crustaceans, and many shrimp and crab she...

Claims

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Application Information

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IPC IPC(8): C08J3/00C08L5/08D01F9/00B02C21/00B08B3/12B04B1/00
Inventor 李大纲陈楚楚胡琴琴邵旭李晶王茹
Owner SHANDONG LVSEN WOOD PLASTIC COMPOSITE
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