Ceramic silica gel foam extinguishing agent and preparation method thereof

Abstract

The invention discloses a preparation method of a ceramizable silica gel foam extinguishing agent, and belongs to the technical field of class-A solid fire prevention and control, and the ceramizable silica gel foam extinguishing agent is prepared by blending silicate, a foaming agent, a stabilizer, a catalyst, an inorganic filler and a water-based polymer emulsion. The ceramizable silica gel foam extinguishing agent is in a gel foam state at normal temperature, the retention time of the ceramizable silica gel foam extinguishing agent on the solid surface can be prolonged, and the ceramizable silica gel foam extinguishing agent has good cooling, covering and oxygen diluting capacities; in a high-temperature combustion environment, the contained silica gel, the inorganic filler and the polymer emulsion component can synergistically form a compact and stable ceramic protection layer, and have good fireproof and heat insulation effects. The preparation method of the ceramizable silica gel foam extinguishing agent provided by the invention is simple, convenient and easy to implement, low in cost and environment-friendly, and shows excellent fire extinguishing efficiency and fireproof barrier capability in A-type solid fire disasters.

Description

Technical Field

[0001] The invention relates to the technical field of Class A solid fire prevention and control, and in particular to a method for preparing a ceramicized silicone gel foam fire extinguishing agent. Background Art

[0002] Among many fire accidents, fires caused by solid combustibles are currently the most common type of fire. Class A combustible solids include wood, coal, fiber, plastic and its products, etc., and the combustion form is complex. Water fire extinguishing is a simple and feasible method to extinguish Class A solid fires, but water has a large surface tension and poor adhesion to the solid surface. It is easy to cause a large amount of water loss due to gravity, and it is difficult to continuously absorb heat. The fire extinguishing efficiency is low. It is urgent to develop a water-based fire extinguishing agent suitable for Class A solid fires.

[0003] Hydrogel fire extinguishing agents have strong water absorption capacity, high viscosity, strong adhesion, good water-fixing effect, prolonged water retention time, rapid cooling, and good effect in solid fire extinguishing. However, most polymer hydrogels have long premixing time, poor fluidity, shortened fire extinguishing range, and easy clogging of water gun nozzles, which have certain limitations. After the water-based foam fire extinguishing agent is sprayed out, it contacts the air to produce a large amount of foam, which dilutes oxygen while cooling the flame, but when used to extinguish solid fires, the residual water stains are difficult to remove, and the fire cannot be effectively extinguished, and the fire extinguishing efficiency needs to be improved. The ceramic silicone gel foam fire extinguishing agent is in a gel foam state at room temperature, which can prolong its residence time on the solid surface, has good cooling, covering, and oxygen dilution capabilities, and can form a dense and stable ceramic protective layer in high temperature or fire environment, which can significantly improve the oxygen isolation and cooling and physical barrier effects, and show good fire extinguishing efficiency and fire barrier capabilities. Therefore, it is very necessary to involve a preparation method of a ceramic silicone gel foam fire extinguishing agent for Class A solid fires. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing a ceramic silicone gel foam fire extinguishing agent, so as to solve the problem of limited fire extinguishing efficiency and fire barrier capacity of water-based fire extinguishing agents currently used for Class A solid fires mentioned in the above background technology. The ceramic silicone gel foam fire extinguishing agent is obtained by blending silicate, foaming agent, stabilizer, catalyst, inorganic filler, and aqueous polymer emulsion. On the one hand, the ceramic silicone gel foam fire extinguishing agent is in a gel foam state at room temperature, which can prolong its residence time on the solid surface and has good cooling, covering, and oxygen dilution capabilities; on the other hand, in a high temperature and combustion environment, the silicone gel, inorganic filler, and polymer emulsion components contained therein can synergistically form a dense and stable ceramic protective layer, which has good fire prevention and heat insulation effects.

[0005] The present invention provides a method for preparing a ceramicized silicone gel foam fire extinguishing agent, which is characterized by comprising the following steps, wherein the parts of the materials used are parts by weight unless otherwise specified:

[0006] (1) Mix 1 to 10 parts of a stabilizer with 500 to 1000 parts of water in a reaction kettle, swell overnight at 30° C., and stir for 1 to 3 hours to prepare a stabilizer aqueous solution;

[0007] (2) mixing 1 to 10 parts of a foaming agent with 50 to 500 parts of water in a reaction kettle, stirring at 40° C. for 0.5 to 2 hours to prepare a foaming agent aqueous solution;

[0008] (3) 10 to 1000 parts of silicate, 1 to 500 parts of stabilizer, 1 to 500 parts of foaming agent and 10 to 3000 parts of water are mixed, and stirred at room temperature for 1 to 3 hours; then 1 to 100 parts of catalyst are added, and stirred at room temperature for 1 to 10 minutes; finally, 1 to 300 parts of inorganic filler and 1 to 300 parts of aqueous polymer emulsion are added, and stirred at room temperature for 10 to 30 minutes to obtain a ceramicizable silicone gel foam fire extinguishing agent.

[0009] The method for preparing the ceramicizable silica gel foam fire extinguishing agent is characterized in that the silicate is one or more of sodium silicate and lithium silicate.

[0010] The method for preparing the ceramicizable silicone gel foam fire extinguishing agent is characterized in that the stabilizer is one or more of carboxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose.

[0011] The method for preparing the ceramicizable silicone gel foam fire extinguishing agent is characterized in that the foaming agent is one or more of sodium dodecyl phosphate trioxide, sodium succinate sulfonate, alkylphenol polyoxyethylene ether, and pentaerythritol fatty acid ester.

[0012] The method for preparing the ceramicizable silicone gel foam fire extinguishing agent is characterized in that the catalyst is one or more of formic acid and acetic acid.

[0013] The method for preparing the ceramicizable silica gel foam fire extinguishing agent is characterized in that the inorganic filler is one or more of wollastonite, glass powder, mica powder, zinc borate, aluminum oxide, and zirconium oxide.

[0014] The method for preparing the ceramicizable silicone gel foam fire extinguishing agent is characterized in that the aqueous polymer emulsion is one or more of methylphenyl silicone resin emulsion, epoxy-modified methylphenyl silicone resin emulsion, and acrylic acid-modified methylphenyl silicone resin emulsion.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The ceramicizable silicone gel foam fire extinguishing agent prepared by the present invention is in a gel foam state at room temperature, which can prolong its residence time on the solid surface and has good cooling, covering and oxygen dilution capabilities. At the same time, it can form a dense and stable ceramic protective layer in a high temperature or fire environment, which can significantly improve the oxygen isolation and cooling and physical barrier effects, has good fire extinguishing efficiency and fire barrier capabilities, and is suitable for Class A solid fire prevention and control.

[0017] (2) The preparation method of the ceramicizable silicone gel foam fire extinguishing agent involved in the present invention is simple, easy and low-cost, and the raw materials used are environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The invention relates to a preparation process of a ceramic silicone gel foam fire extinguishing agent;

[0019] Figure 2 It is the fire extinguishing and fire barrier mechanism of ceramic silicone gel foam fire extinguishing agent. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1

[0022] A method for preparing a ceramicized silicone gel foam fire extinguishing agent according to a preferred embodiment of the present invention, in this embodiment, 10 parts of hydroxypropyl cellulose and 500 parts of water are mixed in a reactor, swelled overnight at 30°C, stirred for 1h, and configured into a hydroxypropyl cellulose aqueous solution; 10 parts of sodium dodecyl phosphate trioxide and 100 parts of water are mixed in a reactor, stirred at 40°C for 1h, and configured into a sodium dodecyl phosphate trioxide aqueous solution; 100 parts of sodium silicate, 30 parts of hydroxypropyl cellulose aqueous solution, 60 parts of sodium dodecyl phosphate trioxide aqueous solution and 595 parts of water are mixed, and stirred at room temperature for 1h; then 15 parts of acetic acid are added, and stirred at room temperature for 5min; finally, 50 parts of wollastonite, 50 parts of glass powder and 100 parts of methylphenyl silicone resin emulsion are added, and stirred at room temperature for 30min to obtain a ceramicized silicone gel foam fire extinguishing agent, and its preparation process is as follows: Figure 1 As shown in the figure, the fire extinguishing and fire blocking mechanisms are as follows Figure 2 shown.

[0023] After testing, the ceramicized silicone gel foam fire extinguishing agent prepared by Example 1 has a hardening time of 8s and a viscosity of 2160mPa·s. For a pine board coated with the ceramicized silicone gel foam fire extinguishing agent with a thickness of 5mm, a dense ceramic protective layer can be formed at high temperature, and the fire resistance time is not less than 30min.

[0024] Example 2

[0025] A method for preparing a ceramicizable silicone gel foam fire extinguishing agent according to a preferred embodiment of the present invention, in this embodiment, 10 parts of carboxymethyl cellulose and 500 parts of water are mixed in a reactor, swelled overnight at 30°C, stirred for 1 hour, and configured into a carboxymethyl cellulose aqueous solution; 10 parts of dodecyl sodium triphosphate and 100 parts of water are mixed in a reactor, stirred at 40°C for 1 hour, and configured into a dodecyl sodium triphosphate aqueous solution; 100 parts of sodium silicate, 30 parts of carboxymethyl cellulose aqueous solution, 60 parts of dodecyl sodium triphosphate aqueous solution and 495 parts of water are mixed, and stirred at room temperature for 1 hour; then 15 parts of acetic acid are added, and stirred at room temperature for 5 minutes; finally, 75 parts of wollastonite, 75 parts of glass powder and 150 parts of methylphenyl silicone resin emulsion are added, and stirred at room temperature for 30 minutes to obtain a ceramicizable silicone gel foam fire extinguishing agent.

[0026] After testing, the ceramicized silicone gel foam fire extinguishing agent prepared by Example 2 has a hardening time of 11s and a viscosity of 4120mPa·s. For a pine board coated with the ceramicized silicone gel foam fire extinguishing agent with a thickness of 5mm, a dense ceramic protective layer can be formed at high temperature, and the fire resistance time is not less than 30min.

[0027] Example 3

[0028] A method for preparing a ceramicizable silicone gel foam fire extinguishing agent according to a preferred embodiment of the present invention, in this embodiment, 10 parts of carboxymethyl cellulose and 500 parts of water are mixed in a reactor, swelled overnight at 30°C, stirred for 1 hour, and configured into a carboxymethyl cellulose aqueous solution; 10 parts of sodium succinate sulfonate and 100 parts of water are mixed in a reactor, stirred at 40°C for 1 hour, and configured into a sodium succinate sulfonate aqueous solution; 100 parts of sodium silicate, 40 parts of carboxymethyl cellulose aqueous solution, 50 parts of sodium succinate sulfonate aqueous solution and 495 parts of water are mixed, and stirred at room temperature for 1 hour; then 15 parts of acetic acid are added, and stirred at room temperature for 5 minutes; finally, 75 parts of glass powder, 75 parts of mica powder and 150 parts of epoxy-modified methylphenyl silicone resin emulsion are added, and stirred at room temperature for 30 minutes to obtain a ceramicizable silicone gel foam fire extinguishing agent.

[0029] After testing, the ceramicized silicone gel foam fire extinguishing agent prepared by Example 3 has a hardening time of 10s and a viscosity of 4390mPa·s. For a pine board coated with the ceramicized silicone gel foam fire extinguishing agent with a thickness of 5mm, a dense ceramic protective layer can be formed at high temperature, and the fire resistance time is not less than 30min.

[0030] from Figure 1 It can be seen that when acetic acid catalyst is added to the sodium silicate solution, the anions in the sodium silicate combine with hydrogen ions to generate silicic acid, and then undergo a dehydration condensation process to form an inorganic silicone gel with a Si-O-Si network structure. During the mechanical stirring process, hydroxypropyl cellulose (stabilizer) is interwoven with the Si-O-Si segments of the inorganic silicone gel through intermolecular forces, and at the same time, the cation Na+ combines the anion S- of sodium dodecyl triphosphate (foaming agent) and the anion I- of the inorganic silicone gel in the form of S-Na+I- through electrostatic adsorption. At the same time, the methylphenyl silicone resin emulsion can form an interpenetrating network structure with the silicone gel, and has good interface compatibility with wollastonite and glass powder fillers, which helps to improve the dispersion effect of the silicone gel and the filler. The bubbles generated by the foaming agent and the introduced inorganic fillers such as wollastonite and glass powder can support and strengthen the inorganic silicone gel network structure, and finally form a ceramic silicone gel foam.

[0031] from Figure 2 It can be seen that after the ceramic silicone gel foam fire extinguishing agent comes into contact with Class A combustible solids, it can achieve efficient fire extinguishing and anti-reignition of combustible solids through multiple synergistic effects such as effective covering adhesion - cooling and temperature reduction - free radical capture - combustible gas dilution - carbonization protection; through the stable carbon layer protection strengthened by the three-dimensional mesh ceramic body, it can achieve effective fire barrier for combustible solids.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for preparing a ceramicized silicone gel foam fire extinguishing agent, characterized in that The method comprises the following steps, and the parts of the materials used are parts by weight unless otherwise specified: (1) Mix 1 to 10 parts of a stabilizer with 500 to 1000 parts of water in a reaction kettle, swell overnight at 30° C., and stir for 1 to 3 hours to prepare a stabilizer aqueous solution; (2) mixing 1 to 10 parts of a foaming agent with 50 to 500 parts of water in a reaction kettle, stirring at 40° C. for 0.5 to 2 hours to prepare a foaming agent aqueous solution; (3) 10 to 1000 parts of silicate, 1 to 500 parts of stabilizer, 1 to 500 parts of foaming agent and 10 to 3000 parts of water are mixed, and stirred at room temperature for 1 to 3 hours; then 1 to 100 parts of catalyst are added, and stirred at room temperature for 1 to 10 minutes; finally, 1 to 300 parts of inorganic filler and 1 to 300 parts of aqueous polymer emulsion are added, and stirred at room temperature for 10 to 30 minutes to obtain a ceramicizable silicone gel foam fire extinguishing agent.

2. The method for preparing the ceramicizable silicone gel foam fire extinguishing agent according to claim 1, characterized in that: The silicate is one or more of sodium silicate and lithium silicate.

3. The method for preparing the ceramicizable silicone gel foam fire extinguishing agent according to claim 1, characterized in that: The stabilizer is one or more of carboxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl cellulose.

4. The method for preparing the ceramicizable silicone gel foam fire extinguishing agent according to claim 1, characterized in that: The foaming agent is one or more of sodium dodecyl trioxyphosphate, sodium sulfosuccinate, alkylphenol polyoxyethylene ether, and pentaerythritol fatty acid ester.

5. The method for preparing the ceramicizable silicone gel foam fire extinguishing agent according to claim 1, characterized in that: The catalyst is one or more of formic acid and acetic acid.

6. The method for preparing the ceramicizable silicone gel foam fire extinguishing agent according to claim 1, characterized in that: The inorganic filler is one or more of wollastonite, glass powder, mica powder, zinc borate, aluminum oxide, and zirconium oxide.

7. The method for preparing the ceramicizable silicone gel foam fire extinguishing agent according to claim 1, characterized in that: The aqueous polymer emulsion is one or more of methylphenyl silicone resin emulsion, epoxy-modified methylphenyl silicone resin emulsion, and acrylic acid-modified methylphenyl silicone resin emulsion.

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