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High-temperature phase-transitional temperature-sensitive fire-extinguishing gel and preparation method thereof

A phase transition and gel technology, which is applied in the direction of fire prevention equipment, etc., can solve problems such as impact and environmental pollution, and achieve the effects of improving fire extinguishing performance, high phase transition temperature, and fast transition speed

Inactive Publication Date: 2012-10-31
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, all fire extinguishing gels are chemically cross-linked. Whether it is water glass gel or sodium polyacrylate gel, once gelled, it is no longer reversible, and it will cause pollution and environmental impact after fire extinguishing

Method used

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  • High-temperature phase-transitional temperature-sensitive fire-extinguishing gel and preparation method thereof
  • High-temperature phase-transitional temperature-sensitive fire-extinguishing gel and preparation method thereof
  • High-temperature phase-transitional temperature-sensitive fire-extinguishing gel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment one: The preparation of hydroxyl-terminated hyperbranched polyether G1, the chemical reaction formula is:

[0027]

[0028] Mix 1mol trimethylolpropane (134g) with 0.1mol KOH (5.6g), heat up to 100°C for dehydration and protonation, add dioxane and stir to dissolve, slowly add 3mol glycidol (222g) dropwise, and reflux for 10h. After cooling, it was neutralized with sulfuric acid, the white crystals were filtered off, and the solvent was distilled off under reduced pressure to obtain the product (356g).

Embodiment 2

[0029] Embodiment two: The preparation of carboxyl-terminated hyperbranched polyether C11, the chemical reaction formula is:

[0030]

[0031] Take 1mol of hydroxyl-terminated hyperbranched polyether G1 (356g), add appropriate amount of dioxane, stir and dissolve, mix with 3mol potassium monochloroacetate (397.5g) and heat up to reflux for 5 hours, filter out the crystals, and evaporate the solvent under reduced pressure to obtain the product (530g).

Embodiment 3

[0032] Embodiment three: The preparation of carboxyl-terminated hyperbranched polyether C12, the chemical reaction formula is:

[0033]

[0034] Take 1 mol of hydroxyl-terminated hyperbranched polyether G1 (356g), add appropriate amount of dioxane and stir to dissolve, mix with 6 mol of potassium monochloroacetate (795g) and heat up to reflux for 5h, filter out the crystals, distill off the solvent under reduced pressure to obtain the product ( 704g).

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Abstract

The invention relates to a high-temperature phase-transitional temperature-sensitive fire-extinguishing gel and a preparation method thereof. Through the physical crosslinking between polyacid with a hydrophilic backbone structure and polyamine with a hydrophobic backbone structure, the fire-extinguishing gel is in a soluble state at a low temperature and in a gel state at a high temperature. Thefire-extinguishing agent is a low-viscosity aqueous solution at normal temperature; the viscosity is gradually increased as the temperature rises, and then the aquagel is formed and adhered on the surface of burning objects, thus the effect of fire-extinguishing is achieved and the fire behavior is blocked from spreading; after the temperature of the gel is lowered to a certain temperature, the gel is returned to the state of liquid, the residue can be cleaned by using water for flushing, thereby being efficient and environment-friendly. The fire-extinguishing agent provided by the invention has low viscosity, can be spouted by using the traditional squirt gun; meanwhile, other elements, such as fire-proofing agent, flame retardant, and the like, can be added to improve the fire-extinguishing performance of the fire-extinguishing agent.

Description

technical field [0001] The invention relates to a high temperature phase transition thermosensitive fire extinguishing gel and a preparation method thereof. Background technique [0002] In a fire, combustible substances have a large combustion calorific value, high combustion temperature, and long fire fighting time. A large amount of water vapor will be generated at the fire scene, and water vapor explosion may be generated in confined spaces and high-temperature places (high-temperature reactors, saunas, etc.), causing rescue Casualties (occurs frequently in actual fire extinguishing), the amount of water vaporization should be reduced as much as possible when extinguishing fires in such places. Gel fire extinguishing has the characteristics of good water retention, reduced water consumption, improved coverage and extinction effect, high thermal stability, etc., and at the same time improves the safety of the fire extinguishing process. [0003] For combustible solid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D1/00
Inventor 张宝华崔后礼陈斌谈惠洁谢磊范永清
Owner SHANGHAI UNIV
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