Preparation method of aqueous-phase and organic-phase solvent stably dispersednano chitin
A technology of nano-chitin and organic phase, which is applied in the field of preparation of chitin nano-materials, can solve problems such as the inability to achieve stable dispersion of aqueous phase and organic phase solvents at the same time, single dispersion properties of nano-chitin, and achieve the effect of ensuring safety
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Embodiment 1
[0030] The present embodiment provides a kind of preparation method of chitin slurry, comprises the steps:
[0031] Step 11, take the crab shell raw material, wash and cut into pieces, soak the chopped crab shell raw material in 1M sodium hydroxide for about 12 hours to remove the protein component in the crab shell raw material, and wash the crab shell raw material with distilled water After reaching neutrality, soak in 1M hydrochloric acid for about 12 hours to remove the mineral components in the crab shell raw materials, repeat the above treatment process three times to remove as much calcium and protein components as possible in the crab shell raw materials, and finally soften the crab shells Raw material washed to neutral.
[0032] Step 12. Bleaching and removing the pigment in the raw material fragments of crab shells in a 0.5% (w / w) sodium chlorite solution in a water bath at 70° C. to obtain white chitin raw material fragments.
[0033] Step 13. Wash the white chitin...
Embodiment 2
[0036] The present embodiment provides a kind of preparation method of formic acid pretreatment chitin slurry, comprises the steps:
[0037] The solid-to-liquid ratio of the dry weight of the purified chitin slurry to the formic acid solution is 1:50, and the formic acid solution with a concentration of 15 M is prepared, and the dry weight of 4 g of the chitin slurry prepared in Example 1 is taken, and the chitin slurry is Add it into the formic acid solution, stir and mix evenly, and place it in a constant temperature water bath at 90°C, and stir it at 100 rpm for 4 hours. The formylation modification of the chitin surface and the loosening of the fiber structure are realized by formic acid, and the reaction is completed.
[0038] The reaction system was filtered with a filter cloth to obtain a precipitate and washed with distilled water until neutral to obtain formic acid pretreated chitin slurry.
Embodiment 3
[0040] This embodiment provides a method for preparing nano-chitin stably dispersed in an acidic aqueous solution, comprising the following steps:
[0041] Furthermore, the acidic medium in the acidic aqueous solution includes but is not limited to at least one of hydrochloric acid, sulfuric acid, formic acid, acetic acid, propionic acid, malonic acid, citric acid, and oxalic acid. In this embodiment, acetic acid is selected as the medium in the acidic aqueous solution. Acid medium.
[0042] The formic acid pretreated chitin slurry prepared in Example 2 was fully stirred and mixed with 1% acetic acid solution at a solid-to-liquid ratio of 1:10, homogenized at 10,000 rpm and ultrasonically treated for 3 minutes, and finally centrifuged to obtain the supernatant to obtain a stable dispersion Nano-chitin in acidic aqueous solution.
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