Temperature-sensitive hydrogel and preparation method thereof

Abstract

The invention discloses temperature-sensitive hydrogel and a preparation method thereof, and belongs to the technical field of hydrogel. The preparation method of the hydrogel comprises the followingsteps: (1) preparing reaction solution by using methyl cellulose and deionized water; (2) by using the reaction solution as a solvent, respectively preparing NaHCO3 solution and NaOH solution, and then mixing the NaHCO3 solution and the NaOH solution to carry out acid-base titration on a certain amount of acrylic acid, thus obtaining sodium-acrylate monomeric correction liquid with a PH value being 7.0; (3) adding N-isopropylacrylamide into a four-port bottle according to a certain proportion, and slowly dripping a certain amount of the sodium-acrylate monomeric correction liquid into the four-port bottle under the condition of nitrogen protection, thus obtaining dissolving liquid; (4) adding a crosslinking agnet, an initiator and a catalyst into the dissolving liquid to prepare the temperature-sensitive hydrogel. The temperature-sensitive hydrogel disclosed by the invention has good fire-extinguishing performance.

Description

Technical field

[0001] The invention relates to the technical field of hydrogels, in particular to a temperature-sensitive hydrogel and a preparation method thereof. Background technique

[0002] Water is currently the most commonly used fire extinguishing agent. In recent years, scientific researchers have done a lot of innovative work on how to improve the efficiency of water fire extinguishing, which is mainly reflected in adding different chemical reagents to the water or changing the physical and chemical properties of the water to enhance the viscosity and adhesion of the water in the burning area. Extend the water retention time, improve the effective oxygen insulation and cooling capacity of the water, save water consumption, so as to give full play to the fire extinguishing performance of water and improve the fire extinguishing efficiency. Currently, the most researched are water-based fire extinguishing agents such as water mist, three-phase foam, aqueous film-forming...

Examples

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...

Technical field

[0001] The invention relates to the technical field of hydrogels, in particular to a temperature-sensitive hydrogel and a preparation method thereof. Background technique

[0002] Water is currently the most commonly used fire extinguishing agent. In recent years, scientific researchers have done a lot of innovative work on how to improve the efficiency of water fire extinguishing, which is mainly reflected in adding different chemical reagents to the water or changing the physical and chemical properties of the water to enhance the viscosity and adhesion of the water in the burning area. Extend the water retention time, improve the effective oxygen insulation and cooling capacity of the water, save water consumption, so as to give full play to the fire extinguishing performance of water and improve the fire extinguishing efficiency. Currently, the most researched are water-based fire extinguishing agents such as water mist, three-phase foam, aqueous film-forming...

Examples

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...