Water-soluble and degradable cross-linking agent, preparation method of gamma-polyglutamic acid water absorbing material using cross-linking agent
A technology of polyglutamic acid and water-absorbing materials, which is applied in the field of polymer chemistry, can solve problems such as inconvenience, and achieve the effects of simple steps, active reactivity, and easy-to-obtain raw materials
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Embodiment 1
[0043] 1) Weigh 1g of chitosan oligosaccharide, 0.9g of EDC and 0.6g of NHS and dissolve them in 30mL of dilute hydrochloric acid with pH=5.2, stir until completely dissolved, add 0.98g of acrylic acid, and stir magnetically for 96h at room temperature. After the reaction was completed, the reaction product was slowly poured into 180 mL of absolute ethanol, stirred to make the chitosan oligosaccharide derivative fully precipitated, vacuum filtered, and the filter cake was naturally dried to obtain an acrylic acid grafted chitosan oligosaccharide cross-linking agent (cross-linking agent). agent 1).
[0044] 2) Dissolve 120 mg of γ-polyglutamic acid in 2 mL of deionized water, add 40 mg of cross-linking agent 1, mix well, then add 1.3 mg of initiator ammonium persulfate and 10 μL of cross-linking accelerator as N, N, N', N '-Tetramethylethylenediamine, polymerized at room temperature for 10h to form a hydrogel-like water-absorbing material, placed in deionized water for repeated...
Embodiment 2
[0046]1) Weigh 1 g of chitosan oligosaccharide, 0.9 g of EDC, and 0.6 g of NHS and dissolve them in 30 mL of dilute hydrochloric acid with pH=4.7, stir until completely dissolved, add 0.98 g of acrylic acid, and stir magnetically for 72 h at room temperature. After the reaction was completed, the reaction product was slowly poured into 180 mL of absolute ethanol, stirred to make the chitosan oligosaccharide derivative fully precipitated, vacuum filtered, and the filter cake was naturally dried to obtain an acrylic acid grafted chitosan oligosaccharide cross-linking agent (cross-linking agent). agent 2).
[0047] 2) Dissolve 120 mg of γ-polyglutamic acid in 2 mL of deionized water, add 40 mg of cross-linking agent 2, mix well, then add 1.0 mg of initiator potassium persulfate and 10 μL of cross-linking accelerator as N, N, N', N '-Tetramethylethylenediamine, polymerized at room temperature for 11h to form a hydrogel-like water-absorbing material, placed in deionized water for r...
Embodiment 3
[0049] 1) Weigh 1g of chitosan oligosaccharide, 0.9g of EDC and 0.6g of NHS and dissolve them in 30mL of dilute hydrochloric acid with pH=5.0, stir until completely dissolved, add 0.49g of acrylic acid, and stir magnetically for 48h at room temperature. After the reaction was completed, the reaction product was slowly poured into 180 mL of absolute ethanol, stirred to make the chitosan oligosaccharide derivative fully precipitated, vacuum filtered, and the filter cake was naturally dried to obtain an acrylic acid grafted chitosan oligosaccharide cross-linking agent (cross-linking agent). agent 3).
[0050] 2) Dissolve 120 mg of γ-polyglutamic acid in 2 mL of deionized water, add 40 mg of cross-linking agent 3, mix well, then add 1.6 mg of initiator ammonium persulfate and 10 μL of cross-linking accelerator as N, N, N', N '-Tetramethylethylenediamine, polymerized at room temperature for 8 hours to form a hydrogel-like water-absorbing material, placed in deionized water for repe...
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