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A resistance type fire detection/early warning sensor and its application

An early warning sensor and fire detection technology, which is applied in the direction of electric fire alarms, etc., can solve the problems of fire alarm influence, fast spreading, poor penetration ability, etc., and achieves low price, simple preparation method and easy availability. Effect

Active Publication Date: 2019-10-29
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they also have obvious disadvantages: infrared fire alarms are easily affected by various heat sources and have poor penetrating ability; smoke alarms are mostly used in indoor environments, and the alarm can only be triggered when a large amount of smoke is generated after a fire has broken out for a period of time , it is impossible to timely and effectively detect / early warning before the fire occurs, and the alarm response time after the fire occurs is greater than 100 seconds (Fire Technol., 2000, 36, 89)
However, when flammable materials burn, they spread extremely quickly (the flame spreads to a height greater than 8 meters in about 80 seconds, Fire Safety Journal, 2011, 46, 317), and even causes fatal damage in more than 10 seconds

Method used

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  • A resistance type fire detection/early warning sensor and its application
  • A resistance type fire detection/early warning sensor and its application
  • A resistance type fire detection/early warning sensor and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Soak 25mg of melamine foam in 1mg / ml graphene oxide aqueous solution prepared with graphite as raw material, take it out and centrifuge at 3000rpm for 5 minutes, and then bake at 80°C for 3h. Repeat the experiment several times until 8 mg of graphene oxide is dip-coated on the melamine foam. Then immerse it in a 0.5mg / ml n-octyltriethoxysilane modified dual-scale (10nm and 200nm) nano-silica (mass ratio 1:1 mixed) tetrahydrofuran dispersion at 3000 rpm for 5 minutes, Then bake at 80°C for 3h. This is repeated many times until 67 mg of modified superhydrophobic particles are dip-coated on the graphene oxide / melamine foam composite material to obtain a fire detection / early warning composite material 1.

[0031] Connect dry batteries, warning lights, and the fire detection / early warning composite material 1 prepared in Example 1 through wires, such as figure 1 As shown, a resistance type fire detection / early warning sensor 1 is obtained.

Embodiment 2

[0033] Soak 45 mg of melamine foam in a 1 mg / ml graphene oxide aqueous solution prepared with carbon nanotubes as raw materials, take it out and centrifuge at 500 rpm for 10 minutes, and then bake at 80°C for 3 hours. Repeat the experiment several times until 40 mg of graphene oxide is dip-coated on the melamine foam. Then immerse it in a 0.5mg / ml n-octyltriethoxysilane-modified two-scale (10nm and 200nm) nano-silica (mass ratio 1:1 mixing) tetrahydrofuran dispersion and centrifuge at 500rpm for 10 minutes, Then bake at 80°C for 3h. This is repeated many times until 15 mg of modified super-hydrophobic particles are dip-coated on the graphene oxide / melamine foam composite material, a fire detection / early warning composite material 2.

[0034] Connect dry batteries, warning lights, and the fire detection / early warning composite material 2 prepared in Example 2 through wires, such as figure 1 As shown, a resistance type fire detection / early warning sensor 2 is obtained.

Embodiment 3

[0036] 35mg of melamine foam was immersed in 1mg / ml graphene oxide aqueous solution prepared with carbon nanofiber as raw material, taken out and centrifuged at 5000rpm for 2 minutes, and then baked at 80°C for 3h. Repeat the experiment several times until 24 mg of graphene oxide is dip-coated on the melamine foam. Then immerse it in a 0.5mg / ml n-octyltriethoxysilane modified two-scale (25nm and 500nm) nanometer titanium dioxide (mixed by mass ratio of 1:1) in tetrahydrofuran dispersion at 5000 rpm for 2 minutes, then 80 Bake at ℃ for 3h. This is repeated many times until 41 mg of modified superhydrophobic particles are dip-coated on the graphene oxide / melamine foam composite material, a fire detection / early warning composite material3.

[0037] Connect dry batteries, warning lights, and the fire detection / early warning composite 3 prepared in Example 3 through wires, such as figure 1 As shown, a resistance type fire detection / early warning sensor 3 is obtained.

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Abstract

The invention relates to the field of functional materials. In order to solve the deficiencies and defects of the traditional infrared fire alarms and smoke alarms in the using process at present, theinvention provides a novel resistance type fire detection / early-warning sensor, which is formed by connecting a low-voltage power supply, a warning lamp, a fire early-warning composite material and aplurality of lead wires in sequence, wherein the fire early-warning composite material is prepared from, by weight, 25-45 parts of melamine foam, 8-40 parts of graphene oxide and 15-67 parts of silicon-containing additive. The process is simple and efficient, and the raw material is low in cost. The invention further provides an application of the resistance type fire detection / early-warning sensor. The resistance type fire detection / early-warning sensor is used for monitoring and preventing various types of combustible materials in a high fire risk region, reducing or even avoiding the occurrence of fires and loss caused by the fires.

Description

Technical field [0001] The invention relates to the field of functional materials, in particular to a resistance type fire detection / early warning sensor and its application as a fire detection / early warning. Background technique [0002] Inflammable materials such as polymers are indispensable materials in people's daily life; in the field of construction; in terms of thermoplastic polyurethane rigid foam, in Western Europe, North America and other developed countries, it has always been the main material for building thermal insulation. However, the combustion process of this kind of flammable materials will produce fumes containing highly toxic hydrogen cyanide, which can cause suffocation and death in a short time. According to the official WeChat official account of the Fire Department of the Ministry of Public Security, in 2016, a total of 312,000 fires were reported across the country, with 1,582 deaths and 1,065 injuries, causing direct property losses of 3.72 billion yua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B17/06C08J9/40C08L61/28
CPCC08J9/40C08J2361/28G08B17/06
Inventor 汤龙程徐辉张国栋赵丽龚丽秀
Owner HANGZHOU NORMAL UNIVERSITY
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