A chitosan-g-aliphatic acid phase-change material, a preparing method thereof and applications of the material
A phase change material, chitosan technology, applied in the field of material science, can solve the problems of limiting the application value of phase change materials, unable to crystallize smoothly, exothermic heat, and limited side chain crystallization, so as to achieve good application prospects and solve side chain crystallization Supercooling phenomenon, safe and non-toxic effect on human body and environment
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Embodiment 1
[0022] Step 1: dissolving chitosan in an aqueous acetic acid solution with a mass percentage concentration of 3% is prepared as a chitosan solution with a mass percentage concentration of 1.5%;
[0023] Step 2: prepare a coagulation bath according to the ratio of ethanol mass percentage concentration of 50%, NaOH mass percentage concentration of 5%, and distilled water mass percentage of 45%;
[0024] Step 3: The coagulation bath obtained in step 2 is subjected to a high-speed shear of 4000 rpm, and the chitosan solution obtained in step 1 is added to it at the same time, and the high-speed shear is stopped after 5 minutes, and the above-mentioned coagulation containing chitosan is Bath is packed into centrifuge tube, carries out 20 minutes high-speed centrifugation of 10000 rev / mins, collects the chitosan solid that separates out;
[0025] Step 4: fully wash the ultramicronized pretreated chitosan obtained through step 3 with absolute ethanol;
[0026] Step 5: dispersing ana...
Embodiment 2
[0030] Step 1: dissolving chitosan in an aqueous acetic acid solution with a mass percentage concentration of 3% is prepared into a chitosan solution with a mass percentage concentration of 2%;
[0031] Step 2: prepare a coagulation bath according to the ratio of ethanol mass percentage concentration of 50%, NaOH mass percentage concentration of 5%, and distilled water mass percentage of 45%;
[0032] Step 3: The coagulation bath obtained in step 2 is subjected to a high-speed shear of 5000 rpm, and the chitosan solution obtained in step 1 is added to it at the same time, and the high-speed shear is stopped after 7 minutes, and the coagulation bath containing chitosan is packed Put into centrifuge tube, carry out 15 minutes high-speed centrifugation of 7000 rev / mins, collect the chitosan solid that separates out;
[0033] Step 4: fully clean the ultramicronized pretreated chitosan obtained by step 3 with absolute ethanol;
Embodiment 3
[0038] Step 1: dissolving chitosan in an aqueous acetic acid solution with a mass percentage concentration of 3% is prepared into a chitosan solution with a mass percentage concentration of 3%;
[0039] Step 2: prepare a coagulation bath according to the ratio of ethanol mass percentage concentration of 50%, NaOH mass percentage concentration of 5%, and distilled water mass percentage of 45%;
[0040] Step 3: The coagulation bath obtained in step 2 is subjected to a high-speed shear of 5000 rpm, and the chitosan solution obtained in step 1 is added to it at the same time, and the high-speed shear is stopped after 10 minutes, and the above-mentioned coagulation containing chitosan is Bath is packed into centrifuge tube, carries out 10 minutes high-speed centrifugation of 5000 rev / mins, collects the chitosan solid that separates out;
[0041] Step 4: fully wash the ultramicronized pretreated chitosan obtained through step 3 with absolute ethanol;
[0042] Step 5: dispersing ana...
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