CN111888706A

CN111888706A - Preparation method of special D-type dry powder extinguishing agent for aluminum alkyl compounds

Info

Publication number: CN111888706A
Application number: CN202010805061.0A
Authority: CN
Inventors: 宋福全; 卢志国; 孙彦辉; 孙长礼; 杨丰誉
Original assignee: Anhui Botai Electronic Material Co ltd
Current assignee: Anhui Botai Electronic Material Co ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-11-06

Abstract

The invention discloses a preparation method of a special D-type dry powder extinguishing agent for an alkyl aluminum compound, which comprises the following raw materials: fillers, blocking agents, flame retardant active agents and anti-caking agents; 20-40 parts of filler, 20-40 parts of blocking agent, 25-35 parts of flame retardant active agent (BTMP) and 2-8 parts of anti-caking agent. The fire extinguishing agent utilizes a chemical principle to extinguish fire, and according to the high reaction activity principle of trimethylaluminum, the reaction activity of the fire extinguishing agent is reduced by adding the flame-retardant active agent and the trimethylaluminum into the fire extinguishing agent and combining the flame-retardant active agent with the trimethylaluminum, so that the fire extinguishing agent fundamentally prevents the fire extinguishing agent from burning, has high fire extinguishing effect, reduces the reaction activity of the trimethylaluminum through chemical reaction, does not re-burn after fire extinguishing, has low potential safety hazard, has low activity of a product after the reaction of the trimethylaluminum and the flame-retardant active agent, and does not generate; the raw materials are easy to obtain, and the cost is low; the fire extinguishing substance is less in use amount, and is easier to clean after fire extinguishing.

Description

Preparation method of special D-type dry powder extinguishing agent for aluminum alkyl compounds

Technical Field

The invention relates to the technical field of fire extinguishing agents, in particular to a preparation method of a D-type dry powder fire extinguishing agent special for an alkyl aluminum compound.

Background

The D-class dry powder extinguishing agent in the current market is generally divided into two classes, namely a special type, which is only suitable for certain or certain metal fires, has small use area, but often has the advantage of high extinguishing efficiency. Secondly, the utility model is general type, its application scope is wide, but has the speed of putting out a fire slow, the easy relighting, and the problem in the aspect of the material use amount of putting out a fire is big, scene is difficult to be cleared up etc.. So far, no special dry powder extinguishing agent for alkyl aluminum compound fires exists in China.

In the D-type fire extinguisher reported in the patent literature, the main component in CN 104511127A is sodium chloride (68-74%); CN 104069610A contains potassium chloride (45-50%) and sodium chloride (30-35%) as main components; the main component of CN 103751942A is sodium bicarbonate (70-80%), and the main components in the patent are sodium chloride, potassium chloride and sodium bicarbonate, and the compounds prevent the flame from burning continuously by physical covering and air-isolated suffocation, so the fire extinguishing agent belongs to a physical method for extinguishing fire, and the fire extinguishing agent is large in using amount in extinguishing the fire of the alkyl aluminum compounds, slow in fire extinguishing speed, extremely easy to reignite and difficult to clean on site, and therefore the fire extinguishing agent is not suitable for the fire of the alkyl aluminum compounds. The main components in patent CN 105288924A, CN 107693999A and CN 107684684684A are foaming agent high ammonium polyphosphate (50-70%), barrier agent (10-20%), stabilizer filler (10-20%) and other trace components. The main component used in the fire extinguisher is ammonium polyphosphate with the polymerization degree of 50-1000, and the high content of phosphorus and nitrogen elements in the material is helpful for extinguishing the fire of the alkyl aluminum compound, but has the problem of large using amount of fire extinguishing substances. Meanwhile, the D-type dry powder extinguishing agent mentioned in the patents is universal, so that the D-type dry powder extinguishing agent has the defects of generally low extinguishing energy efficiency, large using amount of extinguishing substances, easy re-combustion after extinguishing and difficult cleaning on site, and the preparation method of the D-type dry powder extinguishing agent special for the alkylaluminum compound is provided for the people.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a preparation method of a special D-type dry powder extinguishing agent for an alkylaluminum compound.

In order to achieve the purpose, the invention adopts the following technical scheme:

a preparation method of a special D-type dry powder extinguishing agent for an alkylaluminum compound comprises the following raw materials: fillers, blocking agents, flame retardant active agents and anti-caking agents;

20-40 parts of filler

20-40 parts of barrier agent

25-35 parts of flame-retardant active agent (code: BTMP)

2-8 parts of an anti-caking agent.

Preferably, the filler is modified sodium chloride or potassium chloride, and the particle size of the filler is 10-80 μm.

Preferably, the blocking agent is one or more of silicon dioxide, silicate and expanded graphite, and the particle size of the blocking agent is 1-10 μm.

Preferably, the anti-caking agent is mica or talc.

Preferably, the flame retardant active agent is an organic phosphorus-based oxygen-containing flame retardant, and the particle size of the flame retardant active agent is 1-10 μm.

The invention provides a test using trimethylaluminum with highest activity in alkyl aluminum compounds as a fire extinguishing object, and has the following advantages:

1. fire extinguishing by a chemical principle, namely, according to the high reaction activity principle of trimethylaluminum, the reaction activity of the fire extinguishing agent is reduced by adding a flame retardant active agent into the fire extinguishing agent and combining with the trimethylaluminum, so that the fire extinguishing agent is prevented from burning fundamentally;

2. the fire extinguishing effect is high, and the reaction activity of the trimethylaluminum is reduced through chemical reaction;

3. after fire extinguishment, re-combustion is not carried out, the potential safety hazard is low, the activity of a product obtained after the reaction of the trimethylaluminum and the flame retardant active agent is low, and violent reaction does not occur when the product meets air and water;

4. the raw materials are easy to obtain, and the cost is low;

5. the fire extinguishing substance is less in use amount, and is easier to clean after fire extinguishing.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

Example one

1) 35 percent of sodium chloride, 30 percent of silicate, 30 percent of flame retardant active agent (code number: BTMP), 5% mica was mixed well.

2) All the used raw materials are dried to constant weight under the constant temperature condition of 90-120 ℃ before use so as to stabilize the moisture content in the raw materials, and then are packaged by a vibrating screen. Labeled TMAD-1.

Example two

1) According to weight percentage, 35 percent of potassium chloride, 35 percent of silicate, 25 percent of flame retardant active agent (code number: BTMP) and 5 percent of mica are fully and uniformly mixed, screened and packaged.

2) All the used raw materials are dried to constant weight under the constant temperature condition of 90-120 ℃ before use so as to stabilize the moisture content in the raw materials, and then are packaged by a vibrating screen. Labeled TMAD-2.

EXAMPLE III

1) According to weight percentage, 35 percent of sodium chloride, 35 percent of silicon dioxide, 25 percent of flame retardant active agent (code number: BTMP), 5% mica was mixed well.

2) All the used raw materials are dried to constant weight under the constant temperature condition of 90-120 ℃ before use so as to stabilize the moisture content in the raw materials, and then are packaged by a vibrating screen. Labeled TMAD-3.

Example four

1) 30 percent of sodium chloride, 30 percent of silicon dioxide, 35 percent of flame retardant active agent (code number: BTMP), 5% talc powder.

2) All the used raw materials are dried to constant weight under the constant temperature condition of 90-120 ℃ before use so as to stabilize the moisture content in the raw materials, and then are packaged by a vibrating screen. Labeled TMAD-4.

The flame retardant active agent used by the flame retardant is an organic phosphorus oxygen-containing flame retardant which has high phosphorus content, stable chemical property and no combustion, and simultaneously, the phosphorus element and the oxygen element contained in the structure of the flame retardant can perform a coordination reaction with the aluminum element in the alkyl aluminum to enable the aluminum element to lose the reaction performance. The filler can improve the dispersibility, the fluidity and the suspensibility of the powder in the air and reduce the hygroscopicity of the powder. The blocking agent expands rapidly after being heated, and can form a film on the surface of the burning alkyl aluminum compound to cover the surface of burning substances and isolate external air and moisture.

Trimethylaluminum fire extinguishing experiment

A rectangular stainless steel plate (600 mm +/-10 mm in length, 400 mm +/-10 mm in width, 200 mm +/-10 mm in height and 2.0-2.5mm in wall thickness) is placed on a horizontal ground. 1Kg of trimethylaluminum is added into a stainless steel disc, spontaneous combustion is carried out immediately along with the addition of the trimethylaluminum, and the spontaneous combustion time reaches 10 seconds to start fire extinguishing. The fire extinguishing is to control the valve of the fire extinguisher to make the sample fall into the stainless steel disc as much as possible at a stable flow and flow rate, and to control the flow rate so as not to spray the trimethylaluminum in the stainless steel disc out of the disc. The fire extinguishing time is not more than 100 seconds, and the stirring rod is used for stirring the sample in the disk 15 minutes after the fire extinguishing agent is sprayed, so that the sample is exposed in the air as much as possible and does not re-ignite. Putting the residue into water without explosion and violent reaction, and determining that the trimethyl aluminum is successfully extinguished;

。

the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A preparation method of a special D-type dry powder extinguishing agent for an alkylaluminum compound is characterized by comprising the following raw materials: fillers, blocking agents, flame retardant active agents and anti-caking agents;

2. the preparation method of the D-type dry powder extinguishing agent special for the alkylaluminum compound as claimed in claim 1, wherein the filler is modified sodium chloride or potassium chloride, and the particle size of the filler is 10-80 μm.

3. The preparation method of the special D-type dry powder extinguishing agent for the alkylaluminum compound as claimed in claim 1, wherein the blocking agent is one or more of silica, silicate and expanded graphite, and the particle size of the blocking agent is 1-10 μm.

4. The preparation method of the special D-type dry powder extinguishing agent for the alkylaluminum compound as claimed in claim 1, wherein the anti-caking agent is mica or talc.

5. The preparation method of the D-type dry powder extinguishing agent special for the alkylaluminum compound as claimed in claim 1, wherein the flame retardant active agent is an organophosphorus oxygen-containing flame retardant, and the particle size of the flame retardant active agent is 1-10 μm.