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Preparation method of microcapsule fire extinguishing agent taking dibromomethane as core material

A technology of dibromomethane and microcapsules, which is applied in the field of preparation of microcapsule fire extinguishing agents, can solve the problems of unresolved fire extinguishing agent coverage

Active Publication Date: 2021-02-05
NANJING NORMAL UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating rate of dibromomethane microcapsule fire extinguishing agent has not yet been solved at present.

Method used

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  • Preparation method of microcapsule fire extinguishing agent taking dibromomethane as core material
  • Preparation method of microcapsule fire extinguishing agent taking dibromomethane as core material
  • Preparation method of microcapsule fire extinguishing agent taking dibromomethane as core material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Taking dibromomethane as the preparation method of the microcapsule fire extinguishing agent of core material, comprises the following steps:

[0031] (1) Preparation of wall material solution: Prepare gelatin aqueous solution with a concentration of 3%, sodium polyphosphate aqueous solution with a concentration of 5%, and montmorillonite solution with a concentration of 0.05%.

[0032] (2) Preparation of emulsion: Measure 50mL of 3% gelatin aqueous solution in a flask, slowly add 2mL of dibromomethane into the flask, stir and emulsify at 40°C for 5 minutes at a speed of 4000r / min, then add 10mL of 5% polymer Sodium phosphate aqueous solution and 20mL 0.05% montmorillonite solution were added with 0.3g Span80 and stirred for 10min to form a stable and uniform emulsion.

[0033] (3) Formation of microcapsules: Add 10% sulfuric acid solution to adjust the pH to about 4.0, keep 1000r / min, react at 30°C for 1h, lower the system temperature to below 10°C, add 2mL of curing a...

Embodiment 2

[0041] (1) Preparation of wall material solution: Prepare gelatin aqueous solution with a concentration of 5%, sodium polyphosphate aqueous solution with a concentration of 5%, and montmorillonite solution with a concentration of 0.1%.

[0042] (2) Preparation of emulsion: Measure 50mL of 5% gelatin aqueous solution in a flask, slowly add 2mL of dibromomethane into the flask, stir and emulsify at 40°C for 5 minutes at a speed of 5000r / min, then add 5mL of 5% polymer Sodium phosphate aqueous solution and 28mL 0.1% montmorillonite solution were added with 0.2g Span80 and 0.1g Tween20 and stirred for 5min to form a stable and uniform emulsion.

[0043] (3) Formation of microcapsules: Add 10% sulfuric acid solution to adjust the pH to about 4.0, keep at 2000r / min, react at 30°C for 1h, lower the system temperature to below 10°C, add 2mL of curing agent glutaraldehyde for 1h, then Slowly raise the temperature to 25°C and react for 2h.

[0044] (4) Drying treatment of microcapsules...

Embodiment 3

[0046] (1) Preparation of wall material solution: prepare 3% gelatin aqueous solution, 3% sodium polyphosphate aqueous solution and 0.5% montmorillonite solution respectively.

[0047](2) Preparation of emulsion: Measure 50mL of 3% gelatin aqueous solution in a flask, slowly add 2mL of dibromomethane into the flask, stir and emulsify at 40°C for 5 minutes at a speed of 4000r / min, then add 10mL of 3% polymer Sodium phosphate aqueous solution and 10mL 0.5% montmorillonite solution were added with 0.2g Tween20 and stirred for 10min to form a stable and uniform emulsion.

[0048] (3) Formation of microcapsules: Add 10% sulfuric acid solution to adjust the pH to about 4.0, keep 1000r / min, react at 30°C for 1h, lower the system temperature to below 10°C, add 2mL curing agent glutaraldehyde for 1h, then Slowly raise the temperature to 25°C and react for 2h.

[0049] (4) Drying treatment of microcapsules: wash the microcapsules with deionized water at least 3 times, centrifuge and va...

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Abstract

The invention discloses a preparation method of a microcapsule fire extinguishing agent taking dibromomethane as a core material, and belongs to the technical field of fire extinguishing agents. Gelatin and sodium polyphosphate are adopted as wall materials, a low-boiling-point and high-volatility dibromomethane liquid extinguishing agent is adopted as a core material, montmorillonite nanoparticles are added to modify a microcapsule shell material, a stable effect is achieved, and the prepared extinguishing agent microcapsule is good in stability in a high-humidity and high-temperature environment, capable of being stored for a long time, safe to use, clean and environment-friendly and has good fire extinguishing performance. The method is simple to operate and high in operability, and theselected wall material is beneficial to microencapsulation of the dibromomethane liquid fire extinguishing agent with low boiling point and high volatility.

Description

technical field [0001] The invention belongs to the technical field of fire extinguishing agents, and in particular relates to a preparation method of a microcapsule fire extinguishing agent with dibromomethane as a core material. Background technique [0002] Haloalkane liquid fire extinguishing agent has the advantages of high fire extinguishing efficiency, non-conductivity, stable chemical properties, and no pollution to damaged / damaged objects, and is a widely used fire extinguishing agent. Among them, dibromomethane is a controlled substance that does not destroy the ozone layer, so even if it is released into the environment, it can also play a role in protecting the ozone layer and has a high fire-extinguishing effect. [0003] At present, haloalkane liquid fire extinguishing agent is mainly stored in the pressure container bottle in liquid state when used. Due to the low vapor pressure, the distribution performance is poor when sprayed, and the best effect of the fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D1/00B01J13/02
CPCA62D1/0021B01J13/02
Inventor 马振叶何根升林军周俊
Owner NANJING NORMAL UNIVERSITY
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