Preparation method of smokeless flame-retardant fire blanket

Abstract

The invention discloses a preparation method of a smokeless flame-retardant fire blanket, and relates to the field of fire-fighting facilities, and the smokeless flame-retardant fire blanket is formed by compounding a surface layer, a middle layer and an inner layer; the preparation method of the smokeless flame-retardant fire blanket comprises the following steps: S1, preparing the surface layer: mixing the high-temperature-resistant silicone rubber with the solvent, the curing agent, the filler and the auxiliary agent, and uniformly stirring to form a silicone rubber coating solution; the high-temperature-resistant silicone rubber coating and the glass fibers are used as base materials, the inner layer is the macromolecular fire extinguishing material coating and has excellent fire extinguishing, heat insulating and high-temperature-resistant performance, the product is coated with multiple organic high-temperature-resistant silicone rubber, so that the organic high-temperature-resistant silicone rubber is tightly attached to the surfaces of the glass fibers, and a high-strength composite protective layer is formed; and a special polymer fire extinguishing material coating is further applied, and when exposed to open fire, the functional coating can quickly generate thermal decomposition reaction, release non-combustible gas and effectively reduce local oxygen concentration, so that the flame-retardant and fire-extinguishing effects are realized.

Description

Technical Field

[0001] The present invention relates to the field of fire-fighting facilities, and particularly to a preparation method of a smokeless flame-retardant fire blanket. Background Art

[0002] With the continuous improvement of the requirements for the stability and safety of power supply in modern society, as a key carrier for power transmission, the fire safety of cables is of crucial importance. Once a cable fire occurs, it will not only cause power interruption but also may trigger serious safety accidents. Traditional fire blankets have deficiencies in flame-retardant performance, smokelessness, and targeted protection against cable fires. Therefore, it is necessary to invent a preparation method of a smokeless flame-retardant fire blanket to meet the above requirements. Summary of the Invention

[0003] The purpose of the present invention is to provide a preparation method of a smokeless flame-retardant fire blanket to solve the problems put forward in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A preparation method of a smokeless flame-retardant fire blanket, wherein the smokeless flame-retardant fire blanket is composed of a surface layer, an intermediate layer, and an inner layer in a composite manner; The preparation method of the smokeless flame-retardant fire blanket includes the following steps: S1: Preparation of the surface layer: Mix high-temperature resistant silicone rubber with a solvent, a curing agent, a filler, and an auxiliary agent, and stir evenly to form a silicone rubber coating liquid; S2: Preparation of the intermediate layer: Weave glass fiber into a cloth by using a textile machine to form a glass fiber cloth; S3: Preparation of the inner layer: Mix perfluoroacetone microcapsules with a solvent, a film-forming substance, and an auxiliary agent, and stir evenly to form a fire extinguishing material coating liquid; S4: Composite of the surface layer and the intermediate layer: Uniformly coat the silicone rubber coating liquid on the top of the glass fiber cloth, and perform multiple coatings. After coating, place the glass fiber cloth in a high-temperature environment for curing treatment to make the silicone rubber tightly adhere to the surface of the glass fiber cloth, forming a high-temperature resistant composite base layer; S5: Composite of the inner layer and the composite surface layer and intermediate layer: Uniformly coat the fire extinguishing material coating liquid on the bottom of the glass fiber cloth, and place the glass fiber cloth in a certain temperature and humidity environment for drying treatment to make the high-molecular fire extinguishing material coating firmly adhere to the bottom of the glass fiber cloth, forming a smokeless flame-retardant fire blanket composed of a surface layer, an intermediate layer, and an inner layer; S6: Edge treatment: Perform edge hemming or heat sealing treatment on the edge of the smokeless flame-retardant fire blanket, using a thread or a sealing material that matches the main material of the fire blanket to prevent fiber shedding; S7: Quality inspection: The prepared fire extinguishing blanket is subjected to high-temperature aging treatment to simulate the high-temperature conditions in the actual use environment, further improving the stability and performance of the material, and a comprehensive quality inspection is carried out on the fire extinguishing blanket.

[0005] Preferably, in S1, the high-temperature resistant silicone rubber is added into a container, and the solvent is slowly added. It is stirred for 30 - 60 minutes under the condition that the stirring speed is 200 - 300 r / min. After the uniform stirring is completed, the filler and the auxiliary agent are successively added into the dissolved silicone rubber solution, and it is stirred for 60 - 90 minutes under the condition that the stirring speed is 400 - 600 r / min. Finally, the curing agent is added and it is stirred for 15 - 30 minutes under the condition that the stirring speed is 1500 - 2000 r / min to further refine the particles. The mixed coating is filtered through a suitable filter screen to remove possible impurities and undispersed particles, thereby forming a silicone rubber coating solution.

[0006] Preferably, the mass ratios of the high-temperature resistant silicone rubber, the solvent, the curing agent, the filler and the auxiliary agent in the silicone rubber coating solution are 50%, 30%, 5%, 20% and 5% respectively. The solvent adopts a mixed solvent of toluene and xylene. The filler adopts fumed silica. The auxiliary agent adopts a dispersant, a leveling agent and an antifoaming agent.

[0007] Preferably, in S3, the solvent is first added into a container, and then the film-forming substance is slowly added. It is stirred at a low speed for 30 - 60 minutes under the condition that the stirring speed is 200 - 300 r / min. The auxiliary agent is successively added into the solution and it is stirred for 30 - 45 minutes under the condition that the stirring speed is 400 - 600 r / min to make the auxiliary agent fully dispersed in the solution. The perfluoroacetone microcapsules are slowly added into the above-mentioned uniformly mixed solution. First, it is stirred at a low speed of 200 - 300 r / min for 15 - 20 minutes to preliminarily disperse the microcapsules, and then the stirring speed is increased to 400 - 600 r / min and it is continuously stirred for 30 - 45 minutes to make the perfluoroacetone microcapsules uniformly dispersed in the coating, forming a fire extinguishing material coating solution.

[0008] Preferably, the mass ratios of the perfluoroacetone microcapsules, the solvent, the film-forming substance and the auxiliary agent in the fire extinguishing material coating solution are 20%, 30%, 45% and 5% respectively. The solvent adopts a mixed solvent of ethyl acetate and xylene. The film-forming substance adopts acrylic resin. The auxiliary agent adopts a dispersant, an antifoaming agent and a leveling agent.

[0009] Preferably, in S4, the coating thickness of the surface layer and the intermediate layer is 0.8 mm, the curing time of the surface layer and the intermediate layer is 1.5 minutes, and the curing temperature is 200 °C.

[0010] Preferably, in S5, the coating thickness of the inner layer and the intermediate layer is 0.6 mm, the drying temperature of the inner layer and the intermediate layer is 70 °C, the humidity is 35%, and the drying time is 6 min.

[0011] Preferably, in S7, the aging temperature of the high-temperature aging treatment is 200 °C, and the aging time is 10 min.

[0012] Preferably, in S7, the types of quality inspection of the fire extinguishing blanket are flame retardancy test, smoke density test, toxicity index test, and electrical performance test.

[0013] Technical effects and advantages of the present invention: The smokeless cable flame retardant blanket uses high-temperature resistant silicone rubber coating and glass fiber as the matrix material. The inner layer is a polymer fire extinguishing material coating, containing perfluoroacetone polymer fire extinguishing particles, and has excellent fire extinguishing, heat insulation, and high-temperature resistance performance. By coating multiple layers of organic high-temperature resistant silicone rubber, it adheres tightly to the surface of the glass fiber, forming a high-strength composite protective layer. On this basis, a special polymer fire extinguishing material coating is further applied. When exposed to an open flame, this functional coating can quickly undergo a thermal decomposition reaction, release non-combustible gases, and effectively reduce the local oxygen concentration, thereby achieving the effect of flame retardancy and fire extinguishing. Description of the Drawings

[0014] Figure 1 It is a flow chart of the present invention. Detailed Embodiments

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0016] The present invention provides a method for preparing a smokeless flame retardant fire extinguishing blanket as Figure 1 shown. The smokeless flame retardant fire extinguishing blanket is composed of a surface layer, an intermediate layer, and an inner layer in combination; The method for preparing a smokeless flame retardant fire extinguishing blanket includes the following steps: S1: Preparation of the surface layer: Mix high-temperature resistant silicone rubber with a solvent, a curing agent, a filler, and an auxiliary agent, and stir evenly to form a silicone rubber coating solution; S2: Preparation of the intermediate layer: Use a textile machine to weave glass fiber into a cloth to form a glass fiber cloth. Glass fiber has very high fire resistance. When subjected to the action of flame high temperature, it will not burn itself and will not produce a large amount of smoke. The chemical properties of materials such as glass fiber are stable and will not undergo complex chemical reactions to produce smoke components at high temperatures; S3: Inner layer preparation: Mix perfluoroacetone microcapsules with a solvent, film-forming substances, and additives, and stir evenly to form a fire-extinguishing material coating solution. When exposed to an open flame, this functional coating can rapidly undergo a thermal decomposition reaction, releasing non-combustible gases and effectively reducing the local oxygen concentration. When the oxygen concentration decreases, combustion cannot continue due to lack of oxygen. Without a continuous combustion process, there will be no smoke generated from incomplete combustion. S4: Composite the surface layer and the intermediate layer: Evenly coat the silicone rubber coating solution on the top of the fiberglass cloth and perform multiple coatings. After coating, place the fiberglass cloth in a high-temperature environment for curing treatment to make the silicone rubber tightly adhere to the surface of the fiberglass cloth, forming a high-temperature-resistant composite base layer. S5: Composite the inner layer with the composite surface layer and intermediate layer: Evenly coat the fire-extinguishing material coating solution on the bottom of the fiberglass cloth, and place the fiberglass cloth in a certain temperature and humidity environment for drying treatment to make the polymer fire-extinguishing material coating firmly adhere to the bottom of the fiberglass cloth, forming a smokeless flame-retardant fire blanket composed of a surface layer, an intermediate layer, and an inner layer. S6: Edge treatment: Perform edge hemming or heat sealing on the edge of the smokeless flame-retardant fire blanket, using a thread or sealing material that matches the main material of the fire blanket to prevent fiber shedding. Use fiberglass thread to hem the edge of the fire blanket, with the stitch spacing controlled at 3 - 5 mm. S7: Quality inspection: Subject the prepared fire blanket to high-temperature aging treatment to simulate the high-temperature conditions in the actual use environment, further improving the stability and performance of the material, and conduct a comprehensive quality inspection on the fire blanket.

[0017] Product features: Fire extinguishing performance: Complies with Class B1 of the Classification of the Burning Performance of Building Materials and Products GB8624 - 2012; Adopts a temperature-sensitive triggering mechanism and automatically activates the fire extinguishing function when detecting a temperature above 150°C.

[0018] Triple protection: Integrates fire extinguishing / heat insulation / anti-re-ignition functions, with a protection time ≤ 5 years.

[0019] Smoke density: The smoke density grade of GB / T17651 - 2021 ≤ 15 (light transmittance ≥ 80%).

[0020] Toxicity index: The toxicity index of GB / T20285 - 2006 ≤ 5 (no halogen release).

[0021] Breakdown voltage: 12.2 kV / mm.

[0022] Technical parameters: Item Parameter Explosion-proof rating ExdIIC level Instantaneous maximum temperature resistance (°C) 1650℃ Impact resistance pressure ≥32% Thermal conductivity ≤0.05 W / (m·K) (at 25°C) Color Grey / Red Fire extinguishing time ≤12s Vertical combustion fire resistance rating V-0 Inner diameter of coiled cable MJT-13-HS: 30 mm MJT-30-HS: 80 mm High molecular fire extinguishing material coating 1) Low temperature resistance: -60°C 2) High temperature resistance: 260°C 3) Dielectric strength: 23 kV / mm 4) Volume resistivity: >1.06*10^16 Ω·cm 5) Surface resistivity: 1.1*10^14 Ω·cm 6) Fire extinguishing trigger temperature: ≥150°C Use environment: Temperature: Continuous operating temperature -65 to 300 °C / 1650 °C for 15 - 30 seconds; Humidity: ≤ 95% RH (non-condensing).

[0023] Applicable scenarios: Applicable to various types of cable systems in industrial plants, commercial buildings, residential communities, subways, tunnels, bridges, etc., including power cables, communication cables, control cables, etc. It can also be used in other occasions that require fire and heat insulation, such as the protection of pipelines and equipment, with a wide range of applications.

[0024] Installation requirements: Clean the cable surface to ensure no oil stains or dust.

[0025] The fire blanket needs to completely wrap the cable, and the overlap at the joint should be ≥ 100 mm.

[0026] Use steel binding straps or self-adhesive glue for fixation to avoid loosening.

[0027] When multiple cables are parallel, the blanket body needs to cover all cables and extend more than 200 mm to both sides.

[0028] In S1, add high-temperature resistant silicone rubber into the container, and slowly add the solvent. Stir for 30 - 60 min under the condition of a stirring speed of 200 - 300 r / min. After the uniform stirring is completed, add the filler and additives into the dissolved silicone rubber solution in sequence, stir for 60 - 90 min under the condition of 400 - 600 r / min, and finally add the curing agent, stir for 15 - 30 minutes under the condition of 1500 - 2000 r / min to further refine the particles. Filter the mixed coating through a suitable filter screen to remove possible impurities and undispersed particles, thereby forming a silicone rubber coating solution.

[0029] The mass ratios of high-temperature resistant silicone rubber, solvent, curing agent, filler, and additive in the silicone rubber coating solution are 50%, 30%, 5%, 20%, and 5% respectively. The solvent uses a mixed solvent of toluene and xylene, the filler uses fumed silica, and the additives use dispersant, leveling agent, and defoamer.

[0030] In S3, first add the solvent into the container, then slowly add the film-forming substance, stir at a low speed of 200 - 300 r / min for 30 - 60 min, add the additives into the solution in sequence, stir for 30 - 45 min under the condition of a stirring speed of 400 - 600 r / min to make the additives fully dispersed in the solution, slowly add perfluoroacetone microcapsules into the above-mentioned uniformly mixed solution, first stir at a low speed of 200 - 300 r / min for 15 - 20 min to preliminarily disperse the microcapsules, and then increase the stirring speed to 400 - 600 r / min and continue to stir for 30 - 45 min to make the perfluoroacetone microcapsules uniformly dispersed in the coating, forming a fire extinguishing material coating solution.

[0031] The mass ratios of perfluoroacetone microcapsules, solvent, film-forming substance and additives in the fire extinguishing material coating liquid are 20%, 30%, 45% and 5% respectively. The solvent uses a mixed solvent of ethyl acetate and xylene. The film-forming substance uses acrylic resin. The additives use dispersant, defoamer and leveling agent. The acrylic resin has good weather resistance, decorative property and adhesion, and is suitable for a variety of application scenarios. The dispersant can be selected from polyacrylates, the defoamer can be selected from silicone-based ones, and the leveling agent can be selected from acrylate-based ones.

[0032] In S4, the coating thickness of the surface layer and the intermediate layer is 0.8 mm, the curing time of the surface layer and the intermediate layer is 1.5 min, and the curing temperature is 200 °C.

[0033] In S5, the coating thickness of the inner layer and the intermediate layer is 0.6 mm, the drying temperature of the inner layer and the intermediate layer is 70 °C, the humidity is 35%, and the drying time is 6 min.

[0034] In S7, the aging temperature of the high-temperature aging treatment is 200 °C, and the aging time is 10 min.

[0035] In S7, the types of quality inspection of the fire blanket are flame retardancy test, smoke density test, toxicity index test and electrical performance test. The flame retardancy test is carried out according to the GB8624-2012 standard to ensure reaching Class B1; the smoke density test is based on the GB / T17651-2021 standard, the smoke density grade ≤ 15, and the light transmittance ≥ 80%; the toxicity index test is carried out according to the GB / T20285-2006 standard, the toxicity index ≤ 5, and there is no halogen release; the breakdown voltage of the electrical performance test reaches 12.2 kV / mm, and the dielectric strength of the polymer fire extinguishing material coating reaches 23 kV / mm.

[0036] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of a smokeless flame-retardant fire blanket, characterized in that: The smokeless flame-retardant fire blanket is composed of a surface layer, an intermediate layer, and an inner layer which are compounded together; The preparation method of the smokeless flame-retardant fire blanket includes the following steps: S1: Preparation of the surface layer: Mix high-temperature resistant silicone rubber with a solvent, a curing agent, a filler, and an auxiliary agent, and stir evenly to form a silicone rubber coating solution; S2: Preparation of the intermediate layer: Use a textile machine to weave glass fiber into a cloth to form a glass fiber cloth; S3: Preparation of the inner layer: Mix perfluoroacetone microcapsules with a solvent, a film-forming substance, and an auxiliary agent, and stir evenly to form a fire extinguishing material coating solution; S4: Compound the surface layer and the intermediate layer: Uniformly coat the silicone rubber coating solution on the top of the glass fiber cloth, and perform multiple coatings. After coating, place the glass fiber cloth in a high-temperature environment for curing treatment to make the silicone rubber tightly adhere to the surface of the glass fiber cloth, forming a high-temperature resistant composite base layer; S5: Compound the inner layer with the compounded surface layer and intermediate layer: Uniformly coat the fire extinguishing material coating solution on the bottom of the glass fiber cloth, and place the glass fiber cloth in a certain temperature and humidity environment for drying treatment to make the high-molecular fire extinguishing material coating firmly adhere to the bottom of the glass fiber cloth, forming a smokeless flame-retardant fire blanket composed of a surface layer, an intermediate layer, and an inner layer; S6: Edge treatment: Perform edge hemming or heat sealing on the edge of the smokeless flame-retardant fire blanket, using a thread or a sealing material that matches the main material of the fire blanket to prevent fiber shedding; S7: Quality inspection: Subject the prepared fire blanket to high-temperature aging treatment to simulate the high-temperature conditions in the actual use environment, further improve the stability and performance of the material, and conduct a comprehensive quality inspection on the fire blanket.

2. The preparation method of a smokeless flame-retardant fire blanket according to claim 1, characterized in that: In S1, add the high-temperature resistant silicone rubber into a container, and slowly add the solvent. Stir for 30 - 60 minutes under the condition that the stirring speed is 200 - 300 r / min. After the uniform stirring is completed, sequentially add the filler and the auxiliary agent into the dissolved silicone rubber solution, stir for 60 - 90 minutes under the condition of 400 - 600 r / min, and finally add the curing agent and stir for 15 - 30 minutes under the condition of 1500 - 2000 r / min to further refine the particles. Filter the mixed coating through a suitable filter screen to remove possible impurities and undispersed particles, thereby forming a silicone rubber coating solution.

3. The preparation method of a smokeless flame-retardant fire blanket according to claim 2, characterized in that: The mass ratio of the high-temperature resistant silicone rubber, the solvent, the curing agent, the filler, and the auxiliary agent in the silicone rubber coating solution is 50%, 30%, 5%, 20%, and 5%. The solvent uses a mixed solvent of toluene and xylene. The filler uses fumed silica. The auxiliary agent uses a dispersant, a leveling agent, and an antifoaming agent.

4. The preparation method of a smokeless flame-retardant fire blanket according to claim 3, characterized in that: In S3, first add the solvent into the container, then slowly add the film-forming substance, and stir at a low speed for 30 - 60 min under the condition that the stirring speed is 200 - 300 r / min. Add the additives into the solution in sequence, and stir for 30 - 45 min under the condition that the stirring speed is 400 - 600 r / min to fully disperse the additives in the solution. Slowly add the perfluoroacetone microcapsules into the above-mentioned uniformly mixed solution. First, stir at a low speed of 200 - 300 r / min for 15 - 20 min to preliminarily disperse the microcapsules, and then increase the stirring speed to 400 - 600 r / min and continue to stir for 30 - 45 min to make the perfluoroacetone microcapsules uniformly disperse in the coating, forming a fire-extinguishing material coating solution.

5. The preparation method of a smokeless flame-retardant fire blanket according to claim 4, characterized in that: The mass ratios of the perfluoroacetone microcapsules, the solvent, the film-forming substance, and the additives in the fire-extinguishing material coating solution are 20%, 30%, 45%, and 5% respectively. The solvent uses a mixed solvent of ethyl acetate and xylene. The film-forming substance uses acrylic resin. The additives use a dispersant, an antifoaming agent, and a leveling agent.

6. The preparation method of a smokeless flame-retardant fire blanket according to claim 5, characterized in that: In S4, the coating thickness of the surface layer and the intermediate layer is 0.8 mm, the curing time of the surface layer and the intermediate layer is 1.5 min, and the curing temperature is 200 °C.

7. The preparation method of a smokeless flame-retardant fire blanket according to claim 6, characterized in that: In S5, the coating thickness of the inner layer and the intermediate layer is 0.6 mm, the drying temperature of the inner layer and the intermediate layer is 70 °C, the humidity is 35%, and the drying time is 6 min.

8. The preparation method of a smokeless flame-retardant fire blanket according to claim 7, characterized in that: In S7, the aging temperature of the high-temperature aging treatment is 200 °C, and the aging time is 10 min.

9. The preparation method of a smokeless flame-retardant fire blanket according to claim 8, characterized in that: In S7, the types of quality inspection of the fire blanket are flame retardancy test, smoke density test, toxicity index test, and electrical performance test.

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