Temperature-sensitive hydrogel and preparation method thereof
A temperature-sensitive hydrogel and deionized water technology, applied in the direction of fire prevention equipment, etc., can solve the problems of high cost, difficulty in widespread promotion and application, complicated separation process, etc., achieve efficient fire extinguishing effect, improve cooling and sealing effect, the effect of increasing the amount of stay
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Embodiment 1
[0025] A method for preparing a temperature-sensitive hydrogel includes the following steps:
[0026] (1) Pre-configured with methyl cellulose and 75°C deionized water into a reaction solution with a concentration of 39%, fully stirred, and put it in the refrigerator to stand for 55h until use;
[0027] (2) Use the above-mentioned reaction solution as a solvent, and each are configured into NaHCO with a concentration of 2mol / L 3 Solution and NaOH solution, then NaHCO 3 After mixing the solution and NaOH solution, use it to perform acid-base titration on a certain amount of acrylic acid to obtain a sodium acrylate monomer adjustment solution with a pH of 7.0; among them, methyl cellulose can form a better thickening effect with acrylic acid;
[0028] (3) Add N-isopropyl acrylamide to a 1000ml four-neck flask in a certain proportion, and slowly drop a certain amount of sodium acrylate monomer adjustment solution into the four-neck flask under nitrogen protection. The ratio of the amoun...
Embodiment 2
[0032] A method for preparing a temperature-sensitive hydrogel includes the following steps:
[0033] (1) Prepare a reaction solution with a concentration of 40% with methyl cellulose and 80°C deionized water in advance, stir it thoroughly, and put it in the refrigerator to stand for 60 hours until use;
[0034] (2) Use the above-mentioned reaction solution as a solvent, and each are configured into NaHCO with a concentration of 2mol / L 3 Solution and NaOH solution, then NaHCO 3 After mixing the solution and NaOH solution, use it to perform acid-base titration on a certain amount of acrylic acid to obtain a sodium acrylate monomer adjustment solution with a pH of 7.0; among them, methyl cellulose can form a better thickening effect with acrylic acid;
[0035] (3) Add N-isopropyl acrylamide to a 1000ml four-neck flask in a certain proportion, and slowly drop a certain amount of sodium acrylate monomer adjustment solution into the four-neck flask under nitrogen protection. The ratio of ...
Embodiment 3
[0039] A method for preparing a temperature-sensitive hydrogel includes the following steps:
[0040] (1) Pre-configured with methyl cellulose and 85°C deionized water into a 41% concentration reaction solution, fully stirred it, and put it in the refrigerator to stand for 65h until use;
[0041] (2) Use the above-mentioned reaction solution as a solvent, and each are configured into NaHCO with a concentration of 2mol / L 3 Solution and NaOH solution, then NaHCO 3 After mixing the solution and NaOH solution, use it to perform acid-base titration on a certain amount of acrylic acid to obtain a sodium acrylate monomer adjustment solution with a pH of 7.0; among them, methyl cellulose can form a better thickening effect with acrylic acid;
[0042] (3) Add N-isopropyl acrylamide to a 1000ml four-neck flask in a certain proportion, and slowly drop a certain amount of sodium acrylate monomer adjustment solution into the four-neck flask under nitrogen protection. The ratio of the amount of pr...
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