Environment-friendly internal plasticization hemicellulose membrane and preparation method thereof
A technology of hemicellulose and internal plasticization, which is applied in the field of environmentally friendly internally plasticized hemicellulose membrane material and its preparation, hemicellulose membrane, can solve the problems of poor mechanical properties, water resistance and multifunctionality, and limitations, and achieve Easy to recycle, easy to operate, high mechanical properties
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Embodiment 1
[0027] (1) 100g of yellow bamboo is dried and ground into powder, add 75g of sodium chlorite to 100g of yellow bamboo powder, add 2000mL of distilled water, adjust the pH value to 3.8 with 6mol / L acetic acid, extract at 75°C for 2h, filter, and use the filter residue Washing twice with 95% (wt.) ethanol, and drying at 60°C for 12 hours to obtain delignified yellow bamboo;
[0028] (2) Extract 50 g of the delignified yellow bamboo obtained in step (1) with 1000 mL of 10% (wt.) KOH solution at 23° C. for 10 h, and filter; the obtained filtrate is adjusted to pH 5.5 with 6 mol / L acetic acid, and concentrated to Add 50mL of 95% (wt.) ethanol to 25mL, let it stand for 10h, filter, wash the obtained precipitate twice with 70% (volume) ethanol, and dry at 60°C for 12h to obtain xylan hemicellulose;
[0029] (3) Add 3.3 g of the xylan hemicellulose obtained in step (2) to 100 mL of dimethyl sulfoxide, heat at 90°C for 90 minutes until completely dissolved, and obtain a xylan hemicellu...
Embodiment 2
[0040] (1) 50g of yellow bamboo is dried and ground into powder, add 50g of sodium chlorite to 50g of yellow bamboo powder, add 1000mL of distilled water, adjust the pH value to 3.8 with acetic acid, extract at 70°C for 2.5h, filter, and filter the residue with 95% washing with ethanol for 3 times, and drying at 50°C for 16 hours to obtain delignified yellow bamboo;
[0041](2) Extract 25 g of the delignified yellow bamboo obtained in step (1) with 500 mL of 10% (wt.) KOH solution at 20° C. for 12 hours, and filter; the obtained filtrate is adjusted to pH 5.5 with 6 mol / L acetic acid, and concentrated to Add 30mL of 95% (wt.) ethanol to 15mL, let it stand for 8h, filter, wash the obtained precipitate with 60% (volume) ethanol for 3 times, and dry at 50°C for 16h to obtain xylan hemicellulose;
[0042] (3) Add 3.3 g of the xylan hemicellulose obtained in step (2) to 100 mL of dimethyl sulfoxide, heat at 90°C for 90 minutes until completely dissolved, and obtain a xylan hemicell...
Embodiment 3
[0052] (1) 50g of yellow bamboo is dried and ground into powder, add 50g of sodium chlorite to 50g of yellow bamboo powder, add 1000mL of distilled water, adjust the pH value to 3.8 with acetic acid, extract at 70°C for 2.5h, filter, and filter the residue with 95% washing with ethanol for 3 times, and drying at 50°C for 16 hours to obtain delignified yellow bamboo;
[0053] (2) Extract 25 g of the delignified yellow bamboo obtained in step (1) with 500 mL of 10% (wt.) KOH solution at 20° C. for 12 hours, and filter; the obtained filtrate is adjusted to pH 5.5 with 6 mol / L acetic acid, and concentrated to Add 30mL of 95% (wt.) ethanol to 15mL, let stand for 8h, filter, wash the obtained precipitate with 50% (volume) ethanol for 3 times, and dry at 50°C for 16h to obtain xylan hemicellulose;
[0054] (3) Add 3.3 g of the xylan hemicellulose obtained in step (2) to 100 mL of dimethyl sulfoxide, heat at 90°C for 90 minutes until completely dissolved, and obtain a xylan hemicellul...
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