A preparation method of modified graphene oxide flame retardant film and its fire warning application

Abstract

The invention discloses a flame-retardant modified graphene oxide film. The flame-retardant modified graphene oxide film is produced from, by weight, 0.1-0.6 part of ascorbic acid, 1 part of grapheneoxide and 0.1-0.5 part of a silane coupling agent. A production method of the flame-retardant modified graphene oxide film comprises the following steps: preparing an aqueous solution by using graphene oxide, adding the silane coupling agent and L-ascorbic acid, performing stirring, removing bubbles as possible, and drying the obtained solution to obtain the film. A low-temperature fire early warning device is constructed on the basis of the film. The device is formed through sequentially connecting a low-voltage safety battery, a warning lamp and the modified graphene oxide film by lead wires. Silanization treatment is adopted to realize the synergistic flame retardancy of the graphene oxide and silicone and enhancement of the thermal stability of the structure, and the addition of the L-ascorbic acid can enhance the thermal reaction of graphene oxide at a low temperature, so the silane and L-ascorbic acid synergistically-modified graphene oxide film produced in the invention reducesthe response temperature of early warning, greatly shortens the early warning time, and can maintain the skeleton at a high temperature or in a flame in order to continuously give an alarm.

Description

technical field [0001] The invention relates to the field of film preparation, relates to the preparation and application of a graphene film, in particular to a preparation method of a modified graphene oxide flame-retardant film and its fire warning application. Background technique [0002] With the development of society, more and more new materials are becoming more and more closely related to our lives. Whether at work or at home, new materials continue to improve our quality of life. However, there are also many problems in new materials, among which the fire safety performance is particularly important, and there is an urgent need to design a new fire early warning sensor in life. Some recent examples are enough to prove the urgency of new fire sensors. On March 25, 2018, a fire broke out in a shopping mall in Kemerovo, a city in southern Siberia, Russia. According to the latest news released by the Russian Ministry of Emergency Situations on the 26th, the fire has k...

AI Technical Summary

Problems solved by technology

On March 25, 2018, a fire broke out in a shopping mall in Kemerovo, a city in southern Siberia, Russia. According to the latest news released by the Russian Ministry of Emergency Situations on the 26th, the fire has killed 64 people, most of whom were children. Caused a lot of disasters, the main reason is that the danger signal was not transmitted in time before and after the fire, resulting in more people unable to escape in time (especially children with weak safety awareness); according to incomplete statistics, various fires occur every year around the world After the fire, it not only caused a large amount of property loss but also endangered people's lives.

However, pure graphene oxide films have many problems in fire detection and early warning applications

For example, in the case of medium and low temperature (100-250 ℃), the warning time is too long, and the warning effect cannot be achieved; it can be turned on quickly in the flame, but the combustion condition will destroy its structure and cannot complete the continuous warning

[0005] Previous studies have shown that the use of phosphorus and nitrogen can improve the flame retardancy of graphene oxide (ACS Nano2014,8(3),2820-2825; Adv.Funct.Mater.2016,26,1470–1476); however, related treatment The technology still has organic solvent emissions, complex preparation process, high cost, and harmful substances such as residual halogens, which restrict the practical application of this type of flame retardant film material

As mentioned in a recent article, the use of polydopamine modified graphene oxide film (ACSNano, 2018, 12, 4, 3159–3171), although this film reduces the response temperature of the early warning sensor, but in the case of medium and low temperatures, especially It is that the alarm speed at 250°C is not very ideal, and its structure will still be destroyed (burned out) in the flame; and the cost of modification with dopamine is still high

Therefore, how to develop a facile, low-cost and controllable strategy to improve the responsivity and detection temperature of resistive fire detection sensors remains a challenge.

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