Preparation method of core-shell type cooling flame-retardant fire extinguishing agent for lithium batteries
A lithium battery and fire extinguishing agent technology, applied in the direction of fire prevention equipment, etc., can solve the problems of lack of cooling and fire extinguishing, inability to effectively suppress secondary or multiple reburning of lithium battery fires, and lack of applicability in fires, etc., to reduce battery life. temperature, inhibition of secondary or multiple re-ignition, and the effect of rapid battery temperature
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[0028] General embodiment: a method for preparing a core-shell type cooling and flame-retardant lithium battery fire extinguishing agent, comprising the following preparation steps:
[0029] (1) Dissolve styrene, methyl methacrylate, acrylonitrile and 2-bromo-3,3,3-trifluoropropene in pyrrolidone at 1-1.1:1-1.1:1-1.1:3 and place in reaction React in the kettle at room temperature for 8-12 hours to prepare a coating solution with a concentration of 5-30wt%;
[0030] (2) Disperse perfluorohexanone in the coating solution by spraying, the mass ratio of perfluorohexanone to coating solution is 10-12:1, and the atomized particle size is 0.1-10 μm during spray dispersion. Stirring at 200-800r / min for 0.5-3h to prepare a mixed solution;
[0031] (3) The mixed solution is aged at 60-70° C. for 0.5-3 hours, and then sieved to prepare a core-shell type cooling and flame-retardant lithium battery fire extinguishing agent.
Embodiment 1
[0032] Embodiment 1: A preparation method of a core-shell type cooling and flame-retardant lithium battery fire extinguishing agent, comprising the following preparation steps:
[0033] (1) Dissolve styrene, methyl methacrylate, acrylonitrile and 2-bromo-3,3,3-trifluoropropene in pyrrolidone at a ratio of 1:1:1:3 and place it in a reactor at room temperature for 10 hour, the preparation concentration is 10wt% coating solution;
[0034] (2) Disperse perfluorohexanone in the coating solution by spraying. The mass ratio of perfluorohexanone and coating solution is 12:1. The atomized particle size is 0.5 μm during spray dispersion. Stirring for 1.5 h under min to prepare a mixed solution;
[0035] (3) The mixed solution was aged at 65° C. for 0.9 h, and then sieved to prepare a core-shell type cooling and flame-retardant lithium battery fire extinguishing agent.
Embodiment 2
[0036] Embodiment 2: A preparation method of a core-shell type cooling and flame-retardant lithium battery fire extinguishing agent, comprising the following preparation steps:
[0037] (1) Dissolve styrene, methyl methacrylate, acrylonitrile and 2-bromo-3,3,3-trifluoropropene in pyrrolidone at a ratio of 1.1:1.1:1.1:3 and place it in a reactor at room temperature for reaction 8 hours, the prepared concentration is 30wt% coating solution;
[0038](2) Disperse perfluorohexanone in the coating solution by spraying. The mass ratio of perfluorohexanone and coating solution is 11:1. The atomized particle size is 1 μm during spray dispersion. Under stirring for 0.5h, a mixed solution was prepared;
[0039] (3) The mixed solution was aged at 70° C. for 0.5 h, and then sieved to prepare a core-shell type cooling and flame-retardant lithium battery fire extinguishing agent.
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