Gelatin film based on cellulose chemical crosslinking and preparation method thereof
A technology of chemical crosslinking and cellulose, applied in the field of gelatin film and its preparation based on cellulose chemical crosslinking, to achieve the effect of improving light blocking performance, light blocking performance and hydrophobicity
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Embodiment 1
[0059] A kind of synthetic method of novel macromolecular cross-linking agent based on cellulose:
[0060] (1) Synthesis of EDTA dianhydride (EDTAD):
[0061] Weigh 20g of EDTA disodium salt and dissolve it in 100ml of water to form a transparent solution. During stirring, add 1.5mol / L HCl drop by drop until a white precipitate appears, and filter with suction to obtain EDTA; weigh 18g of EDTA and 24ml of acetic anhydride in 31 ml pyridine to form a suspension, 65 °C oil bath magnetic stirring for 24 h, after the reaction was completed, it was washed with distilled water and ether, then suction filtered, and vacuum-dried at 50 °C to obtain white powdery solid EDTA dianhydride (EDTAD).
[0062] (2) Preparation of EDTAD functionalized microcrystalline cellulose (ME):
[0063] Weigh 3 g of microcrystalline cellulose (MCC) and 9 g of EDTAD in 150 ml DMF, and stir magnetically in an oil bath at 70 °C for 24 h. ml of distilled water and 20 ml of ethanol were washed, then suction-f...
Embodiment 2
[0117] (1) Synthesis of EDTA dianhydride (EDTAD):
[0118] Weigh 30g of EDTA disodium salt and dissolve it in 150ml of water to form a transparent solution, add 1mol / L HCl dropwise during stirring until white precipitate appears, and filter to obtain EDTA; weigh 21g of EDTA and 30ml of acetic anhydride in 40ml Suspension was formed in pyridine, magnetically stirred in an oil bath at 72 °C for 24 h, after the reaction was completed, it was washed with distilled water and ether, then suction filtered, and vacuum-dried at 50 °C to obtain white powdery solid EDTA dianhydride (EDTAD).
[0119] (2) Preparation of EDTAD functionalized microcrystalline cellulose (ME):
[0120] Weigh 3 g of MCC and 12 g of EDTAD in 150 ml of DMF, and stir magnetically in an oil bath at 73°C for 30 h. Suction filtration after washing, and vacuum drying at 50°C to obtain a light yellow powdery solid compound, namely, EDTAD functionalized microcrystalline cellulose ME;
[0121] (3) Preparation of N-hydr...
Embodiment 3
[0129] (1) Synthesis of EDTA dianhydride (EDTAD):
[0130] Weigh 40g of EDTA disodium salt and dissolve it in 200ml of water to form a transparent solution, add 2mol / L HCl dropwise during stirring until a white precipitate appears, and filter to obtain EDTA; weigh 25g of EDTA and 40ml of acetic anhydride in 50ml Suspension was formed in pyridine, magnetically stirred in an oil bath at 75 °C for 36 h, after the reaction was completed, it was washed with distilled water and ether, then suction filtered, and vacuum-dried at 50 °C to obtain white powdery solid EDTA dianhydride (EDTAD).
[0131] (2) Preparation of EDTAD functionalized microcrystalline cellulose (ME):
[0132] Weigh 3 g of MCC and 10 g of EDTAD in 120 ml of DMF, and stir magnetically in an oil bath at 65 °C for 20 h. Suction filtration after washing, and vacuum drying at 50°C to obtain a light yellow powdery solid compound, namely, EDTAD functionalized microcrystalline cellulose ME;
[0133] (3) Preparation of N-h...
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