阅读说明：本技术 开关柜用灭火材料及其制备方法 (Fire extinguishing material for switch cabinet and preparation method thereof ) 是由 李唐文 鲍善东 许琨 王树平 高阳 许傲然 谷彩连 刘宝良 冷雪敏 钟丹田 马仕 于 2021-10-18 设计创作，主要内容包括：本发明属于灭火材料技术领域,具体涉及一种开关柜用灭火材料及其制备方法。其中所述开关柜用灭火材料的制备方法,包括：将芯材、乳化剂、引发剂混合后,恒温加热搅拌,制得芯材混合液；将所述芯材混合液加入到壁材溶液中,通入惰性气体,制得反应液；对所述反应液进行加热搅拌发生聚合反应后,静置使产物沉淀、离心、洗涤、干燥后,得到开关柜用灭火材料；本发明的开关柜用灭火材料采用悬浮聚合法微胶囊技术实现卤代烃灭火剂微胶囊化,制得的开关柜用微胶囊型灭火材料分散性好、颗粒大小均匀,同时还具有较好的热稳定性。(The invention belongs to the technical field of fire extinguishing materials, and particularly relates to a fire extinguishing material for a switch cabinet and a preparation method thereof. The preparation method of the fire extinguishing material for the switch cabinet comprises the following steps: mixing a core material, an emulsifier and an initiator, and then heating and stirring at constant temperature to prepare a core material mixed solution; adding the core material mixed solution into the wall material solution, and introducing inert gas to prepare a reaction solution; heating and stirring the reaction solution to perform polymerization reaction, standing to precipitate a product, centrifuging, washing and drying to obtain the fire extinguishing material for the switch cabinet; the fire extinguishing material for the switch cabinet adopts a suspension polymerization microencapsulation technology to realize the microencapsulation of the halogenated hydrocarbon fire extinguishing agent, and the prepared microcapsule type fire extinguishing material for the switch cabinet has good dispersibility, uniform particle size and better thermal stability.)

1. A preparation method of a fire extinguishing material for a switch cabinet is characterized by comprising the following steps:

mixing a core material, an emulsifier and an initiator, and then heating and stirring at constant temperature to prepare a core material mixed solution;

adding the core material mixed solution into the wall material solution, and introducing inert gas to prepare a reaction solution;

and heating and stirring the reaction solution to perform polymerization reaction, standing to precipitate a product, centrifuging, washing and drying to obtain the fire extinguishing material for the switch cabinet.

2. The method according to claim 1, wherein the reaction mixture,

the core material includes: at least one of halogenated hydrocarbons of tetrafluorodibromoethane and 1,1,1,2,2,3,4,5,5, 5-decafluoro-3-methoxy-4- (trifluoromethyl) -pentane.

3. The method according to claim 1, wherein the reaction mixture,

the emulsifier comprises: tween20, Tween20/Span80 and sodium dodecyl benzene sulfonate/Span 80.

4. The method according to claim 1, wherein the reaction mixture,

the initiator comprises: one or more of azodiisoheptanonitrile, benzoyl peroxide and N, N-dimethylaniline.

5. The method according to claim 1, wherein the reaction mixture,

and before preparing the wall material solution from the wall material, carrying out polymerization inhibitor removal treatment on the wall material.

6. The method according to claim 5,

the step of removing the polymerization inhibitor comprises the following steps:

adding the wall material into an alkali solution, stirring, standing, layering, removing a washing solution below, washing an upper layer solution to be neutral, adding anhydrous sodium sulfate into the upper layer solution, standing, filtering, adding cuprous chloride, distilling, collecting a fraction, and storing the fraction at a low temperature to obtain the wall material with the polymerization inhibitor removed.

7. The method according to claim 1, wherein the reaction mixture,

the wall material is methyl methacrylate.

8. The method according to claim 1, wherein the reaction mixture,

the core material and the wall material respectively comprise the following components in parts by weight: 1 part and 1-5 parts.

9. A fire extinguishing material for switch cabinets, which is manufactured by the manufacturing method according to any one of claims 1 to 8,

the fire extinguishing material is formed by wrapping a core material by a wall material.

Technical Field

The invention belongs to the technical field of fire extinguishing materials, and particularly relates to a fire extinguishing material for a switch cabinet and a preparation method thereof.

Background

Among the various disasters, fire is one of the main disasters that threaten public safety and social development most often and most generally.

The development and development of the fire extinguishing material can effectively prevent and control fire, protect the life safety of people and reduce property loss caused by the fire. The common fire extinguishing material is sodium bicarbonate dry powder fire extinguishing material, which is mainly suitable for the initial fire of inflammable and combustible liquid, gas and charged equipment; the ammonium phosphate dry powder extinguishing material can be used for fighting the initial fire of solid substances besides the above fire; the carbon dioxide fire extinguishing material is mainly used for extinguishing the initial fire of valuable equipment, file data, instruments and meters, electrical equipment below 600V and oil.

Disclosure of Invention

The invention provides a fire extinguishing material for a switch cabinet and a preparation method thereof.

In order to solve the technical problem, the invention provides a preparation method of a fire extinguishing material for a switch cabinet, which comprises the following steps: mixing a core material, an emulsifier and an initiator, and then heating and stirring at constant temperature to prepare a core material mixed solution; adding the core material mixed solution into the wall material solution, and introducing inert gas to prepare a reaction solution; and heating and stirring the reaction solution to perform polymerization reaction, standing to precipitate a product, centrifuging, washing and drying to obtain the fire extinguishing material for the switch cabinet.

In another aspect, the invention also provides the fire extinguishing material for the switch cabinet, which is prepared by the preparation method, and the fire extinguishing material is formed by wrapping the core material with the wall material to form the microcapsule type fire extinguishing material.

The invention has the beneficial effects that the fire extinguishing material for the switch cabinet adopts the suspension polymerization microencapsulation technology to realize the microencapsulation of the halogenated hydrocarbon fire extinguishing agent, and the prepared microcapsule type fire extinguishing material for the switch cabinet has good dispersibility, uniform particle size and better thermal stability.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is an SEM photograph of a microcapsule-type fire extinguishing material for a switchgear manufactured in example 2 of the present invention;

FIG. 2 is a TG diagram of a microcapsule-type fire extinguishing material for a switchgear manufactured in example 2 of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The halogenated hydrocarbon as the fire extinguishing material has the advantages of high efficiency, low toxicity, no corrosion, no damage to protected objects, no environmental pollution and the like, and is widely applied to various important places. However, most halocarbon fire extinguishing materials require complex equipment accessories, are costly, require high injection pressures, and are low boiling, volatile, and difficult to store in liquid form.

The invention provides a preparation method of a fire extinguishing material for a switch cabinet, which comprises the following steps: mixing a core material, an emulsifier and an initiator, and then heating and stirring at constant temperature to prepare a core material mixed solution; adding the core material mixed solution into the wall material solution, and introducing inert gas to prepare a reaction solution; and heating and stirring the reaction solution to perform polymerization reaction, standing to precipitate a product, centrifuging, washing and drying to obtain the fire extinguishing material for the switch cabinet.

The fire extinguishing material for the switch cabinet adopts a suspension polymerization microencapsulation technology to realize the microencapsulation of the halogenated hydrocarbon fire extinguishing agent, and the prepared microcapsule type fire extinguishing material for the switch cabinet has good dispersibility, uniform particle size and better thermal stability.

Wherein, optionally, the core material may include but is not limited to: at least one of tetrafluorodibromoethane and 1,1,1,2,2,3,4,5,5, 5-decafluoro-3-methoxy-4- (trifluoromethyl) pentane.

Alternatively, the emulsifier may include, but is not limited to: tween20, Tween20/Span80 and sodium dodecyl benzene sulfonate/Span 80.

Specifically, the microcapsule synthesized by the suspension polymerization method generally uses an oil-soluble initiator, the wall material is initiated to polymerize by the oil-soluble initiator to coat the core material, the embedding effect on the core material is good, and the obtained microcapsule has no problems of core material leakage, no high temperature resistance of the microcapsule and the like.

Alternatively, the initiator may include, but is not limited to: one or more of azodiisoheptanonitrile, benzoyl peroxide and N, N-dimethylaniline.

Further, it is preferable that the wall material is subjected to a polymerization inhibitor removal treatment before the wall material is prepared into a wall material solution.

Optionally, the step of removing the polymerization inhibitor comprises: adding the wall material into an alkali solution, stirring, standing, layering, removing a washing solution below, washing an upper layer solution to be neutral, adding anhydrous sodium sulfate into the upper layer solution, standing, filtering, adding cuprous chloride, distilling, collecting a fraction, and storing the fraction at a low temperature to obtain the wall material with the polymerization inhibitor removed.

Alternatively, the wall material may be, but is not limited to, methyl methacrylate.

Optionally, the core material and the wall material are respectively in parts by weight: 1 part and 1-5 parts; the mass part of the emulsifier can be but is not limited to 0.16-0.48 part; the mass part of the initiator can be but is not limited to 0.01-0.08.

Optionally, the stirring speed during the polymerization reaction can be, but is not limited to, 500 to 1000 r/min.

Specifically, the stirring speed is an important condition for controlling the shearing stress of the microcapsule preparation system, the stirring speed is too low, the dispersed core material liquid drops are not uniformly dispersed, and some core material liquid drops are too large, so that the formed polymer cannot completely coat the core material liquid drops; the emulsion is broken by overlarge stirring speed and overlarge shearing force, and formed core material liquid drops are damaged to influence coating.

In another aspect, the invention also provides the fire extinguishing material for the switch cabinet, which is prepared by the preparation method, wherein the fire extinguishing material is formed by wrapping the core material with the wall material to form the microcapsule type fire extinguishing material.

Example 1

Adding 50 parts by mass of Methyl Methacrylate (MMA) into 250 parts by mass of a separating funnel, adding an equal volume of 10% wt sodium hydroxide solution, stirring, standing for layering, discarding a lower red washing solution, and repeating the operation for several times until the washing solution is colorless; washing the upper layer solution to be neutral by using distilled water, adding 3 parts by mass of anhydrous sodium sulfate, standing for 0.5h, and filtering MMA by using a funnel; to the filtered MMA was added 0.05 mass part of cuprous chloride, and introduced into a single-necked flask and charged into a distillation apparatus.

Starting a vacuum pump to pump, regulating the stable vacuum degree to 10800Pa, heating in a water bath to 40 ℃, then starting to collect the fraction when the pressure is stabilized at 10800Pa and the temperature is stabilized at 40 ℃, separately collecting the fraction at the temperature lower than 40 ℃ or higher than 40 ℃ and not mixing the fraction into the required fraction, and placing the collected fraction at the temperature of 40 ℃ in a refrigerator for later use to obtain the MMA with the polymerization inhibitor removed.

Example 2

Taking 250 parts by mass of a three-necked flask, and adding 50 parts by mass of water, 3 parts by mass of tetrafluorodibromoethane, 0.2 part by mass of azobisisoheptonitrile, 0.78 part by mass of Tween20 and 0.38 part by mass of Span 80; and (3) heating the three-neck flask in a constant-temperature water bath kettle at 25 ℃, and stirring for half an hour under the condition of adjusting the rotating speed to 1500r/min to form a stable O/W system.

Adding 8 parts by mass of MMA obtained in the step of removing the polymerization inhibitor in example 1 into the three-necked flask, and filling argon to remove residual active oxygen; raising the temperature to 40 ℃, adjusting the rotating speed to 900r/min, and carrying out polymerization reaction for 5 hours; after the reaction is finished, the mixture is placed for a period of time to enable the product to be completely precipitated; and centrifuging, washing and drying the product at room temperature for 1 day to obtain white powder, namely the microcapsule type fire extinguishing material for the switch cabinet.

Example 3

Taking 250 parts by mass of a three-necked flask, adding 50 parts by mass of water, 5 parts by mass of 1,1,1,2,2,3,4,5,5, 5-decafluoro-3-methoxy-4- (trifluoromethyl) -pentane, 0.38 part by mass of azobisisoheptonitrile and 2.3 parts by mass of Tween 20; and (3) heating the three-neck flask in a constant-temperature water bath kettle at 25 ℃, and stirring for half an hour under the condition of adjusting the rotating speed to 1500r/min to form a stable O/W system.

Adding 20 parts by mass of MMA obtained in example 1 and having the polymerization inhibitor removed therefrom into the three-necked flask, and introducing argon gas to remove residual active oxygen gas; raising the temperature to 40 ℃, adjusting the rotating speed to 900r/min, and carrying out polymerization reaction for 5 hours; after the reaction is finished, the mixture is placed for a period of time to enable the product to be completely precipitated; and centrifuging, washing and drying the product at room temperature for 1 day to obtain white powder, namely the microcapsule type fire extinguishing material for the switch cabinet.

Example 4

Taking 250 parts by mass of a three-neck flask, and adding 50 parts by mass of water, 3 parts by mass of tetrafluorodibromoethane, 0.05 part by mass of benzoyl peroxide, 0.5 part by mass of sodium dodecyl benzene sulfonate and 0.2 part by mass of Span 80; and (3) heating the three-neck flask in a constant-temperature water bath kettle at 25 ℃, and stirring for half an hour under the condition of adjusting the rotating speed to 1500r/min to form a stable O/W system.

Adding 14 parts by mass of MMA obtained in example 1 and having the polymerization inhibitor removed therefrom into the three-necked flask, and introducing argon gas to remove residual active oxygen gas; raising the temperature to 40 ℃, adjusting the rotating speed to 900r/min, and carrying out polymerization reaction for 5 hours; after the reaction is finished, the mixture is placed for a period of time to enable the product to be completely precipitated; and centrifuging, washing and drying the product at room temperature for 1 day to obtain white powder, namely the microcapsule type fire extinguishing material for the switch cabinet.

Example 5

Taking 250 parts by mass of a three-necked flask, and adding 50 parts by mass of water, 3 parts by mass of tetrafluorodibromoethane, 0.17 part by mass of N, N-dimethylaniline and 0.5 part by mass of Tween 20; and (3) heating the three-neck flask in a constant-temperature water bath kettle at 25 ℃, and stirring for half an hour under the condition of adjusting the rotating speed to 1500r/min to form a stable O/W system.

Adding 6 parts by mass of MMA obtained in example 1 and having the polymerization inhibitor removed therefrom into the three-necked flask, and introducing argon gas to remove residual active oxygen gas; raising the temperature to 40 ℃, adjusting the rotating speed to 900r/min, and carrying out polymerization reaction for 5 hours; after the reaction is finished, the mixture is placed for a period of time to enable the product to be completely precipitated; and centrifuging, washing and drying the product at room temperature for 1 day to obtain white powder, namely the microcapsule type fire extinguishing material for the switch cabinet.

As can be seen from FIGS. 1 and 2, the microcapsule-type fire extinguishing material for switch cabinets prepared in example 2 has good dispersibility, uniform particle size, and good thermal stability.

In conclusion, the fire extinguishing material for the switch cabinet disclosed by the invention realizes microencapsulation of the halogenated hydrocarbon fire extinguishing agent by adopting a suspension polymerization microencapsulation technology, and the prepared microcapsule type fire extinguishing material for the switch cabinet has good dispersibility, uniform particle size and better thermal stability.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.