Low-freezing-point gel type forest fire extinguishing agent and preparation method thereof
A low-freezing point, gel-type technology, used in fire protection equipment and other directions, can solve the problems of gel prone to solidification, reduced adhesion, loss of equipment spraying fluidity, etc.
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[0025] Another embodiment of the present application is a method for preparing a low freezing point gel type forest fire extinguishing agent, comprising the following steps:
[0026] S1. Dissolve 2-(dimethylamino)ethyl acrylate and 1,3-propane sultone in methanol, react at 60°C for 4 hours, cool to room temperature after the reaction, and obtain zwitterionic acrylate Methanol solution of the monomer. The mass ratio of 2-(dimethylamino)ethyl acrylate to 1,3-propane sultone is (0.5~1):(0.42~0.85), preferably 1:0.85.
[0027] S2. Add acrylamide, molecular weight modifier and initiator to the methanol solution of zwitterionic acrylate monomer, react at 65°C for 5-8 hours under the protection of inert gas, and distill off methanol under reduced pressure to obtain beige acrylamide - Zwitterionic acrylate copolymers.
[0028] The molecular weight regulator is one of mercaptopropionic acid, 2-mercaptobutyric acid, and 3-mercaptohexanol butyrate, or two or more of them. Its dosage i...
Embodiment 1
[0035] Dissolve 0.96g of 2-(dimethylamino)ethyl acrylate and 0.82g of 1,3-propane sultone in 15g of methanol, transfer the solution to a single-necked flask, raise the temperature to 60°C, and react for 4 hours. Cool to room temperature after the reaction to obtain a methanol solution of zwitterionic acrylate monomer.
[0036] Add 8.22g of acrylamide, 0.02g of mercaptopropionic acid, and 0.04g of azobisisobutyronitrile into the methanol solution of the zwitterionic acrylate monomer, and fill the reactor with an inert gas (repeated three times), such as nitrogen, to Exclude the air, then raise the temperature of the system to 65°C, and react for 5 hours. Methanol is distilled off under reduced pressure, for example, using a rotary evaporator to remove methanol in the system to obtain a beige acrylamide-zwitterionic acrylate copolymer.
[0037] The acrylamide-zwitterionic acrylate copolymer was dried in an oven at 120°C for 3 hours, crushed and sieved to obtain an acrylamide-zw...
Embodiment 2
[0041] Dissolve 0.53g of 2-(dimethylamino)ethyl acrylate and 0.45g of 1,3-propane sultone in 14g of methanol, transfer the solution to a single-necked flask, raise the temperature to 60°C, and react for 4 hours. Cool to room temperature after the reaction to obtain a methanol solution of zwitterionic acrylate monomer.
[0042]Add 9.02g of acrylamide, 0.02g of 2-mercaptobutyric acid, and 0.04g of benzoyl peroxide to the methanol solution of the zwitterionic acrylate monomer, and fill the reactor with an inert gas (repeated three times), such as nitrogen, In order to exclude the air, the temperature of the system was raised to 65° C., and the reaction was carried out for 7 hours. Methanol is distilled off under reduced pressure, for example, using a rotary evaporator to remove methanol in the system to obtain a beige acrylamide-zwitterionic acrylate copolymer.
[0043] The acrylamide-zwitterionic acrylate copolymer was dried in an oven at 120°C for 3 hours, crushed and sieved t...
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Abstract
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