A kind of modified chitosan amphoteric polymer retanning agent and preparation method thereof
An amphoteric polymer, chitosan technology, applied in animal husbandry, chemical treatment of small raw hides/large raw hides/leather hides/furs, applications, etc. Toxicity and other problems, to overcome the difficult regulation of structure and poor bond and ability, unique preparation method, easy pore size and shape.
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[0015] Example 1:
[0016] 1) Preparation of immobilized horseradish peroxidase: place 1 gram of activated silica gel in a round-bottomed bottle, add 10 grams of acetone and 1 gram of γ-(2,3-glycidoxy)propyltrimethoxy Silane, in N 2 Reflux for 8 hours under protection and filter with suction to prepare epoxidized silica gel. Then add 15 grams of horseradish peroxidase solution with a concentration of 0.25 g / L and 10 grams of mixed phosphate buffer with pH 6.9 at 30°C. React for 10 hours, filter, wash with the above mixed phosphate buffer, and filter with suction to obtain immobilized HRP;
[0017] 2) Preparation of degraded chitosan: mix 5 g of chitosan and 90 g of water and heat to 95°C, add 5 g of 25% hydrochloric acid, and keep the reaction for 3 hours to obtain a degraded chitosan solution;
[0018] 3) Graft copolymerization reaction: add 4.5 g of hydroxypropyl acrylate and 3.6 g of methacrylic acid to 30 g of degraded chitosan, stir and heat to 35°C, adjust the pH of the system...
Example Embodiment
[0019] Example 2:
[0020] 1) Preparation of immobilized horseradish peroxidase: Place 1.4 grams of commercially available activated silica gel in a round bottom bottle, add 11 grams of acetone and 1.2 grams of γ-(2,3-glycidoxy)propyl Trimethoxysilane, in N 2 Reflux for 8 hours under protection and filter with suction to prepare epoxidized silica gel. Then add 17 grams of horseradish peroxidase solution with a concentration of 0.25 g / L and 11 grams of mixed phosphate buffer with a pH of 6.9 at 30°C. React for 10 hours, filter, wash with the above-mentioned mixed phosphate buffer, and filter with suction to prepare immobilized horseradish peroxidase;
[0021] 2) Preparation of degraded chitosan: mix 5 g of chitosan and 90 g of water and heat to 95°C, add 5 g of 25% hydrochloric acid, and keep the reaction for 3 hours to obtain a degraded chitosan solution;
[0022] 3) Graft copolymerization: add 6.1 grams of hydroxypropyl acrylate and 4.8 grams of methacrylic acid to 40 grams of degr...
Example Embodiment
[0023] Example 3:
[0024] 1) Preparation of immobilized horseradish peroxidase: Preparation of immobilized horseradish peroxidase: put 1.8 grams of commercially available activated silica gel in a round bottom bottle, add 12 grams of acetone and 1.4 grams of γ-(2 ,3-glycidoxy) propyltrimethoxysilane, in N 2 Reflux for 8 hours under protection and filter with suction to prepare epoxidized silica gel. Then add 19 grams of horseradish peroxidase solution with a concentration of 0.25 g / L and 12 grams of mixed phosphate buffer with a pH of 6.9 at 30°C. React for 10 hours, filter, wash with the above-mentioned mixed phosphate buffer, and filter with suction to prepare immobilized horseradish peroxidase;
[0025] 2) Preparation of degraded chitosan: mix 5 g of chitosan and 90 g of water and heat to 95°C, add 5 g of 25% hydrochloric acid, and keep the reaction for 3 hours to obtain a degraded chitosan solution;
[0026] 3) Graft copolymerization reaction: add 7.6 g of hydroxypropyl acrylat...
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