CN110499663B - Expansion type fireproof blanket and preparation method thereof - Google Patents
Expansion type fireproof blanket and preparation method thereof Download PDFInfo
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- CN110499663B CN110499663B CN201910783281.5A CN201910783281A CN110499663B CN 110499663 B CN110499663 B CN 110499663B CN 201910783281 A CN201910783281 A CN 201910783281A CN 110499663 B CN110499663 B CN 110499663B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C2/00—Fire prevention or containment
- A62C2/06—Physical fire-barriers
- A62C2/065—Physical fire-barriers having as the main closure device materials, whose characteristics undergo an irreversible change under high temperatures, e.g. intumescent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31F5/00—Attaching together sheets, strips or webs; Reinforcing edges
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/34—Ignifugeants
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention relates to the technical field of fireproof materials, in particular to an expansion type fireproof blanket and a preparation method thereof. The expansion type fireproof blanket is prepared from raw materials including an acrylic acid mixture, a ceramic fiber mixture, a demulsifier, a flocculating agent and water; the acrylic acid mixture comprises acrylic acid emulsion and a defoaming agent; the ceramic fiber mixture comprises ceramic fibers, polyamide epichlorohydrin resin and expansion powder; the mass ratio of the acrylic acid mixture to the ceramic fiber mixture to the demulsifier to the flocculant is 10.3-15.8: 595.2-835.6: 0.8-1.6: 0.2 to 0.6. The intumescent fire blanket provided by the invention has higher expansion multiple and excellent fire resistance. Experiments show that the intumescent fire blanket of the invention is subjected to fire resistance test experiments according to the temperature rise curve in the GB/T9978 standard, the fire resistance duration is longer than 50min, and the expansion rate of the intumescent fire blanket is not less than 2.0.
Description
Technical Field
The invention relates to the technical field of fireproof materials, in particular to an expansion type fireproof blanket and a preparation method thereof.
Background
Fire protection has become an indispensable safety measure in social life. The expansion type fireproof blanket is one of the more advanced passive fireproof products at present, and is widely applied to cable racks, cable buses, steel structures, air pipes, guide pipes and the like. Most of the intumescent fire-proof products are intumescent fire-proof coatings, and in addition, intumescent fire blankets are also available, most of the existing intumescent fire blankets are physically intumescent, and the fire-proof performance is poor.
Disclosure of Invention
In view of this, the technical problem to be solved by the present invention is to provide an intumescent fire blanket and a method for preparing the same, wherein the intumescent fire blanket provided by the present invention has a higher expansion ratio and excellent fire resistance.
The invention provides an expansion type fireproof blanket which is prepared from raw materials comprising an acrylic acid mixture, a ceramic fiber mixture, a demulsifier, a flocculating agent and water; the acrylic acid mixture comprises acrylic acid emulsion and a defoaming agent; the ceramic fiber mixture comprises ceramic fibers, polyamide epichlorohydrin resin and expansion powder;
the mass ratio of the acrylic acid mixture to the ceramic fiber mixture to the demulsifier to the flocculant is 10.3-15.8: 595.2-835.6: 0.8-1.6: 0.2 to 0.6.
Preferably, the mass ratio of the acrylic emulsion to the defoaming agent is 10-29: 0.3 to 0.8.
Preferably, in the acrylic emulsion, the concentration of the acrylic copolymer is 10-30 kg/m3；
The solid content of the acrylic emulsion is 50-60%, the pH value is 7-9, the viscosity is 100-500 mpa & s, and the glass transition temperature is less than 0 ℃.
Preferably, the mass ratio of the ceramic fiber to the polyamide epichlorohydrin resin to the expansion powder is 525-750: 0.03-0.6: 70-85.
Preferably, the ceramic fiber comprises one or more of ceramic fiber blowing cotton, ceramic fiber spinning cotton and ceramic fiber high-aluminum cotton;
the diameter of the ceramic fiber is 2-5 μm.
Preferably, the expansion powder comprises inorganic powder and organic powder;
the inorganic powder comprises vermiculite and/or expanded perlite powder;
the organic powder comprises ammonium polyphosphate, pentaerythritol, melamine, hydroxymethyl cellulose and titanium dioxide;
the mass ratio of the inorganic powder to the organic powder is 50-60: 15 to 30.
Preferably, the demulsifier comprises alum; the flocculant comprises starch.
The invention also provides a preparation method of the intumescent fire blanket, which comprises the following steps:
A) uniformly mixing the acrylic acid mixture, the aqueous solution containing the ceramic fiber mixture, the sol containing the demulsifier and the sol containing the flocculant to obtain slurry;
B) forming the slurry by a papermaking process, and then performing surface sizing to obtain an intermediate product;
C) and drying the intermediate product, and covering non-woven fabrics on two sides of the dried intermediate product to obtain the intumescent fire blanket.
Preferably, in step B), the surface sizing comprises:
soaking the material formed by the papermaking process in acrylic emulsion;
in the acrylic emulsion, the concentration of the acrylic copolymer is 10-30 kg/m3；
The solid content of the acrylic emulsion is 50-60%, the pH value is 7-9, the viscosity is 100-500 mpa & s, and the glass transition temperature is less than 0 ℃.
Preferably, in the step C), the drying temperature is 100-150 ℃, and the drying time is 1-4 h.
The invention provides an expansion type fireproof blanket which is prepared from raw materials comprising an acrylic acid mixture, a ceramic fiber mixture, a demulsifier, a flocculating agent and water; the acrylic acid mixture comprises acrylic acid emulsion and a defoaming agent; the ceramic fiber mixture comprises ceramic fibers, polyamide epichlorohydrin resin and expansion powder; the mass ratio of the acrylic acid mixture to the ceramic fiber mixture to the demulsifier to the flocculant is 10.3-15.8: 595.2-835.6: 0.8-1.6: 0.2 to 0.6. The intumescent fire blanket provided by the invention has higher expansion multiple and excellent fire resistance. The coating can be widely applied to working parts of cable bridges, buses, large cables or special air pipes and the like or completely coated.
Experimental results show that fire resistance tests are carried out on the expansion type fireproof blanket according to a temperature rise curve in the GB/T9978 standard, the fire resistance duration is longer than 50min, and the expansion rate of the expansion type fireproof blanket is not less than 2.0. Therefore, the intumescent fire blanket prepared by the invention has higher expansion times and excellent fire resistance.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention provides an expansion type fireproof blanket which is prepared from raw materials comprising an acrylic acid mixture, a ceramic fiber mixture, a demulsifier, a flocculating agent and water; the acrylic acid mixture comprises acrylic acid emulsion and a defoaming agent; the ceramic fiber mixture comprises ceramic fibers, polyamide epichlorohydrin resin and expansion powder;
the mass ratio of the acrylic acid mixture to the ceramic fiber mixture to the demulsifier to the flocculant is 10.3-15.8: 595.2-835.6: 0.8-1.6: 0.2 to 0.6.
The preparation raw materials of the intumescent fire blanket provided by the invention comprise acrylic acid mixture. The acrylic acid mixture comprises acrylic acid emulsion and defoaming agent.
In certain embodiments of the present invention, the concentration of the acrylic copolymer in the acrylic emulsion is 10 to 30kg/m3The acrylic emulsion has a solid content of 50-60%, a pH value of 7-9, a viscosity of 100-500 mpa & s and a glass transition temperature of less than 0 ℃. In certain embodiments of the invention, the acrylic emulsion is produced by Vanhua chemical group, Inc
The concentration of the acrylic copolymer in the acrylic emulsion is 15kg/m3The acrylic emulsion had a solids content of 52%.
In certain embodiments of the present invention, the anti-foaming agent comprises one or more of tributyl phosphate, polydimethylsiloxane, and natural grease.
In certain embodiments of the present invention, the mass ratio of the acrylic emulsion to the defoamer is 10-29: 0.3 to 0.8. In certain embodiments, the acrylic emulsion and defoamer are present in a mass ratio of 19: 0.4, 23: 0.5 or 28.85: 0.6.
the preparation raw materials of the intumescent fire blanket provided by the invention also comprise a ceramic fiber mixture. The ceramic fiber mixture comprises ceramic fibers, polyamide epichlorohydrin resin and expansion powder.
In certain embodiments of the present invention, the ceramic fibers comprise one or more of ceramic fiber blown cotton, ceramic fiber spun cotton, and ceramic fiber high alumina cotton. In certain embodiments of the present invention, the ceramic fibers have a diameter of 2 to 5 μm. In certain embodiments, the ceramic fibers have a diameter of 2-4 μm.
In the present invention, the polyamide epichlorohydrin resin (PAE resin) is used as a fiber dispersant. The invention is not particularly limited as to the source of the polyamide epichlorohydrin resin, and in certain embodiments of the invention, the polyamide epichlorohydrin resin is a polyamide epichlorohydrin resin produced by plastic materials ltd, of Dongguan.
In certain embodiments of the present invention, the expanded meal comprises inorganic meal and organic meal. The inorganic powder comprises vermiculite and/or expanded perlite powder. The organic powder comprises ammonium polyphosphate, pentaerythritol, melamine, hydroxymethyl cellulose and titanium dioxide. In some embodiments of the present invention, the mass ratio of the ammonium polyphosphate, the pentaerythritol, the melamine, the hydroxymethyl cellulose and the titanium dioxide is 0.5-1.5: 2-3: 1-2: 0.5-1.5: 0.5 to 1.5. In certain embodiments, the mass ratio of ammonium polyphosphate, pentaerythritol, melamine, hydroxymethyl cellulose and titanium dioxide is 1: 2.5: 1.5: 1: 1.
in some embodiments of the present invention, the mass ratio of the inorganic powder to the organic powder is 50 to 60: 15 to 30. In certain embodiments, the mass ratio of the inorganic frit to the organic frit is 50: 25. 55: 26.25 or 50: 28.
in some embodiments of the invention, in the ceramic fiber mixture, the mass ratio of the ceramic fiber to the polyamide epichlorohydrin resin to the expansion powder is 525-750: 0.03-0.6: 70-85. In certain embodiments, the mass ratio of the ceramic fibers, polyamide epichlorohydrin resin and expansion powder is 525: 0.03: 75. 650: 0.04: 81.25 or 700: 0.05: 78.
the preparation raw materials of the intumescent fire blanket provided by the invention also comprise a demulsifier. In certain embodiments of the invention, the demulsifier comprises alum.
The preparation raw materials of the intumescent fire blanket provided by the invention also comprise a flocculating agent. In certain embodiments of the invention, the flocculant comprises starch.
In certain embodiments of the invention, the mass ratio of the acrylic acid mixture to the ceramic fiber mixture to the demulsifier to the flocculant is 10.3-15.8: 595.2-835.6: 0.8-1.6: 0.2 to 0.6. In certain embodiments, the mass ratio of the acrylic mix, ceramic fiber mix, demulsifier, and flocculant is 10.4: 600.03: 1: 0.35, 12.5: 731.29: 1.2: 0.42 or 15.6: 778.05: 1.5: 0.525.
the preparation raw materials of the intumescent fire blanket provided by the invention also comprise water. The water is used for preparing some raw materials into solution or sol, so that slurry is obtained.
In the embodiment of the invention, the volume weight of the intumescent fire blanket is 100-400 kg/m3. In certain embodiments, the intumescent fire blanket has a volume weight of 400kg/m3、300kg/m3Or 200kg/m3. In certain embodiments of the present invention, the intumescent blanket has a thickness of 3-25 mm. In certain embodiments, the intumescent fire blanket has a thickness of 10 mm.
The intumescent fire blanket provided by the invention has higher expansion multiple and excellent fire resistance. The coating can be widely applied to working parts of cable bridges, buses, large cables or special air pipes and the like or completely coated.
The invention also provides a preparation method of the intumescent fire blanket, which comprises the following steps:
A) uniformly mixing the acrylic acid mixture, the aqueous solution containing the ceramic fiber mixture, the sol containing the demulsifier and the sol containing the flocculant to obtain slurry;
B) forming the slurry by a papermaking process, and then performing surface sizing to obtain an intermediate product;
C) and drying the intermediate product, and covering non-woven fabrics on two sides of the dried intermediate product to obtain the intumescent fire blanket.
In the preparation method, the components and the proportion of the raw materials are the same as above, and are not described again.
In some embodiments of the invention, in the aqueous solution containing the ceramic fiber mixture, the ratio of the total amount of the ceramic fibers, the polyamide-epichlorohydrin resin and the expansion powder to the amount of water is 1-4: 100. in certain embodiments, the ratio of the total amount of ceramic fibers, polyamide epichlorohydrin resin, expanded powder, and water is 600.03 kg: 60m3、731.29kg：72m3Or 778.05 kg: 80m3。
In certain embodiments of the invention, the aqueous solution containing the ceramic fiber mixture is prepared according to the following method:
mixing ceramic fiber with part of water, adding polyamide-epichlorohydrin resin, dispersing the fiber uniformly, adding the rest water, and adding the expansion powder.
In certain embodiments of the invention, the agitating mixing is performed in a high speed centrifugal agitator.
In certain embodiments of the invention, the dispersion medium of the demulsifier-containing sol is water. In certain embodiments of the invention, the mass fraction of the sol containing the demulsifier is 8-12%. In certain embodiments, the demulsifier-containing sol is 10% by mass. The method for preparing the polyelectrolyte-containing sol is not particularly limited, and in some embodiments, the polyelectrolyte-containing sol is obtained by stirring and mixing a polyelectrolyte and water.
In certain embodiments of the invention, the dispersion medium of the flocculant-containing sol is water. In certain embodiments of the invention, the mass fraction of the flocculant-containing sol is 1%. The method for preparing the sol containing the flocculant is not particularly limited, and in some embodiments, the sol containing the flocculant is obtained by stirring and mixing the flocculant and water.
The invention firstly mixes the acrylic acid mixture, the water solution containing the ceramic fiber mixture, the sol containing the demulsifier and the sol containing the flocculant uniformly to obtain the slurry. Specifically, the following may be mentioned: adding the acrylic acid mixture into the stirred aqueous solution containing the ceramic fiber mixture, adding the sol containing the demulsifier and the sol containing the flocculant after the foam disappears, and uniformly mixing to obtain the slurry. The stirring method and parameters are not particularly limited in the present invention, and the stirring method and parameters known to those skilled in the art may be used.
And (3) forming the slurry through a papermaking process, and then performing surface sizing to obtain an intermediate product.
In certain embodiments of the present invention, forming the slurry through a papermaking process comprises: and (3) forming the pulp by a paper-making process fourdrinier wire. Specifically, the following may be mentioned: and (3) sequentially carrying out slurry distribution and calendering on the slurry, discharging the slurry to a wet blank forming screen table, carrying out gravity water filtration, squeezing by using a compression roller, and then carrying out vacuum dehydration forming. In some embodiments, the vacuum dewatering forming may be: and (3) dehydrating the wet blank squeezed by the press roll by a vacuum box twice. The vacuum degree of the vacuum dehydration molding is not particularly limited in the present invention, and the vacuum degree of the vacuum dehydration molding known to those skilled in the art may be used.
In certain embodiments of the present invention, the surface sizing comprises:
and (3) soaking the material formed by the papermaking process in acrylic emulsion.
The impregnation process is a process of applying glue on the surface of the product after the vacuum dehydration molding,the surface sizing can improve the surface breaking strength of the product, the surface does not drop slag, and the hydrophobic function is realized. In certain embodiments of the present invention, the concentration of the acrylic copolymer in the acrylic emulsion is 10 to 30kg/m3The acrylic emulsion has a solid content of 50-60%, a pH value of 7-9, a viscosity of 100-500 mpa & s and a glass transition temperature of less than 0 ℃. In certain embodiments of the invention, the acrylic emulsion is produced by Vanhua chemical group, Inc
The concentration of the acrylic copolymer in the acrylic emulsion is 15kg/m3The acrylic emulsion had a solids content of 52%.
In the examples of the present invention, the impregnation is performed at normal temperature. In certain embodiments of the present invention, the rate of impregnation is 0.7 to 0.8m2And/min. In certain embodiments, the rate of impregnation is 0.75m2/min。
And after obtaining the intermediate product, drying the intermediate product, and covering the non-woven fabrics on two sides of the dried intermediate product to obtain the expansion type fireproof blanket.
In some embodiments of the present invention, before drying the intermediate product, the method further comprises suction filtering the intermediate product. After suction filtration, free water and redundant glue solution for surface sizing are removed from the product, the drying speed is accelerated, and the wet embryo strength is improved.
In some embodiments of the present invention, the non-woven fabric has an areal density of 8 to 30g/m2. The fire-receiving surface is made of non-woven fabric with low surface density, which can be 8-12 g/m2(ii) a The back fire surface is made of non-woven fabric with high surface density, and the density can be 20-28 g/m2. Specifically, in the embodiment of the present invention, the area density of the nonwoven fabric for the fire receiving side may be 8g/m2、10g/m2Or 12g/m2. The surface density of the non-woven fabric of the back fire surface can be 20g/m2、24g/m2Or 28g/m2。
In certain embodiments of the invention, the nonwoven may be a needle-punched nonwoven or a non-needle-punched nonwoven, and may be self-adhesive or non-self-adhesive. In some embodiments of the present invention, the non-woven fabric is polypropylene.
The source of the above-mentioned raw materials is not particularly limited in the present invention, and may be generally commercially available.
The expansion type fireproof blanket prepared by the invention has higher expansion times and excellent fireproof performance. The coating can be widely applied to working parts of cable bridges, buses, large cables or special air pipes and the like or completely coated.
In some embodiments of the invention, the intumescent blanket may have a width of 1200mm and a length of greater than 6000mm, and has good thermal insulation when expanded by heat.
Experimental results show that fire resistance tests are carried out on the expansion type fireproof blanket prepared by the invention according to a temperature rise curve in the GB/T9978 standard, the fire resistance duration is longer than 50min, and the expansion rate of the expansion type fireproof blanket is not less than 2.0. Therefore, the intumescent fire blanket prepared by the invention has higher expansion times and excellent fire resistance.
To further illustrate the present invention, the following examples are provided to describe an intumescent fire blanket and a method for making the same in detail, but should not be construed as limiting the scope of the invention.
The starting materials used in the following examples are all generally commercially available.
Example 1
525kg of ceramic fiber silk-floss with the diameter of 2-4 mu m is added into 30m3In water, 0.03kg of PAE was added thereto while stirring with a high-speed centrifugal stirrer. After the fibers are dispersed uniformly, 30m of water is added into the fibers3. Then, adding 75kg of expansion powder: wherein the inorganic expansion powder is 50 kg; 25kg of organic expansion powder, wherein the weight fraction of ammonium polyphosphate, pentaerythritol, melamine, hydroxymethyl cellulose and titanium dioxide is 1: 2.5: 1.5: 1: 1 to obtain a ceramic fiber mixture.
Continuously stirring the ceramic fiber mixture, and adding acrylic emulsion
19kg(The solid content is 52 percent, and the concentration of the acrylic copolymer in the acrylic emulsion is 15kg/m3) And 0.4kg of polydimethylsiloxane. After the foam disappeared, 1kg of alum (prepared into 10% sol) and 0.35kg of starch (prepared into 1% solution) were added and flocculated to obtain a slurry.
Sequentially carrying out cloth slurry calendering on the slurry, discharging the slurry to a wet blank forming screen table through a discharge port, carrying out gravity water filtration, squeezing by using a compression roller, carrying out vacuum dehydration forming, and then soaking the formed material in acrylic emulsion at normal temperature
In (1), the rate of impregnation is 0.75m2Min, the concentration of the acrylic copolymer in the acrylic emulsion is 15kg/m3The solid content of the acrylic emulsion was 52% to obtain an intermediate product.
Drying the intermediate product, coating polypropylene non-woven fabrics on two sides of the dried intermediate product, and coating the inner surface with a density of 20kg/m2The outer surface of the polypropylene non-woven fabric is covered with the polypropylene non-woven fabric, and the density of the outer surface covering is 8kg/m2Polypropylene nonwoven fabric with a bulk density of 400kg/m3And the thickness is 10 mm.
Example 2
650kg of ceramic fiber spun silk floss with the diameter of 2-4 mu m is added into 36m3In water, 0.04kg of PAE was added with stirring by a high speed centrifugal stirrer. After the fibers are dispersed uniformly, 36m of water is added into the fibers3. Then adding 81.25kg of expansion powder: wherein the inorganic expansion powder material is 55 kg; 26.25kg of organic expansion powder, wherein the weight fraction of ammonium polyphosphate, pentaerythritol, melamine, hydroxymethyl cellulose and titanium dioxide is 1: 2.5: 1.5: 1: 1 to obtain a ceramic fiber mixture.
Continuously stirring the ceramic fiber mixture, and adding acrylic emulsion
23kg (solids content 52%, acrylic copolymer concentration in the acrylic emulsion 15kg/m3) And 0.5kg of polydimethylsiloxane. FoamAfter the solution disappears, 1.2kg of alum (prepared into 10 mass percent of sol) and 0.42kg of starch (prepared into 1 mass percent of solution) are added, and the slurry is obtained through flocculation.
Sequentially carrying out cloth slurry calendering on the slurry, discharging the slurry to a wet blank forming screen table through a discharge port, carrying out gravity water filtration, squeezing by using a compression roller, carrying out vacuum dehydration forming, and then soaking the formed material in acrylic emulsion at normal temperature
In (1), the rate of impregnation is 0.75m2Min, the concentration of the acrylic copolymer in the acrylic emulsion is 15kg/m3The solid content of the acrylic emulsion was 52% to obtain an intermediate product.
Drying the intermediate product, coating polypropylene non-woven fabrics on two sides of the dried intermediate product, and coating the inner surface with a density of 24kg/m2The outer surface of the polypropylene non-woven fabric is covered with the polypropylene non-woven fabric, and the density of the surface covering is 10kg/m2Polypropylene nonwoven fabric with a bulk density of 300kg/m3And the thickness is 10 mm.
Example 3
700kg of ceramic fiber silk floss with the diameter of 2-4 mu m is added into 40m3In water, 0.05kg of PAE was added with stirring by a high speed centrifugal stirrer. After the fibers are dispersed uniformly, water is added into the fibers for 40m3. And then adding 78kg of expansion powder: wherein the inorganic expansion powder is 50 kg; 28kg of organic expansion powder, wherein the weight fraction of ammonium polyphosphate, pentaerythritol, melamine, hydroxymethyl cellulose and titanium dioxide is 1: 2.5: 1.5: 1: 1 to obtain a ceramic fiber mixture.
Continuously stirring the ceramic fiber mixture, and adding acrylic emulsion
28.85kg (solids content 52%; acrylic copolymer concentration in the acrylic emulsion 15 kg/m)3) And 0.6kg of polydimethylsiloxane. After the foam disappeared, 1.5kg of alum (prepared into 10% sol) and 0.525kg of starch (prepared into 1% solution) were added to flocculateThus obtaining the slurry.
Sequentially carrying out cloth slurry calendering on the slurry, discharging the slurry to a wet blank forming screen table through a discharge port, carrying out gravity water filtration, squeezing by using a compression roller, carrying out vacuum dehydration forming, and then soaking the formed material in acrylic emulsion at normal temperature
In (1), the rate of impregnation is 0.75m2Min, the concentration of the acrylic copolymer in the acrylic emulsion is 15kg/m3The solid content of the acrylic emulsion was 52% to obtain an intermediate product.
Drying the intermediate product, coating polypropylene non-woven fabrics on two sides of the dried intermediate product, and coating the inner surface with a density of 28kg/m2The outer surface of the polypropylene non-woven fabric is covered with the polypropylene non-woven fabric, and the density of the outer surface covering is 12kg/m2Polypropylene nonwoven fabric with a bulk density of 200kg/m3And the thickness is 10 mm.
Example 4
The intumescent fire blankets obtained in examples 1, 2 and 3 were subjected to a fire resistance test according to the temperature rise curve of the GB/T9978 standard, and the expansion height of the test piece after being heated for the same time was measured to calculate the expansion ratio, and the recorded results are shown in table 1.
Table 1 fire resistance and expansion ratio of intumescent fire blankets obtained in examples 1, 2 and 3
| Sample name | Example 1 | Example 2 | Example 3 |
| Duration of fire resistance (min) | 51 | 56.5 | 52.2 |
| Expansion ratio | 2.0 | 2.8 | 2.1 |
As can be seen from table 1, the fire-resistant time of the intumescent fire blankets obtained in examples 1, 2 and 3 is greater than 50min, and can reach the standard of the secondary fire-resistant cable trough box. The expansion rate of the expansion type fireproof blanket is not less than 2.0.
Experimental results show that fire resistance tests are carried out on the expansion type fireproof blanket prepared by the invention according to a temperature rise curve in the GB/T9978 standard, the fire resistance duration is longer than 50min, and the expansion rate of the expansion type fireproof blanket is not less than 2.0. Therefore, the intumescent fire blanket prepared by the invention has higher expansion times and excellent fire resistance.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An expansion type fireproof blanket is characterized by being prepared from an acrylic acid mixture, a ceramic fiber mixture, a demulsifier, a flocculating agent and water; the acrylic acid mixture consists of acrylic acid emulsion and a defoaming agent; the ceramic fiber mixture consists of ceramic fibers, polyamide epichlorohydrin resin and expansion powder;
the demulsifier is alum; the flocculating agent is starch;
the mass ratio of the acrylic acid mixture to the ceramic fiber mixture to the demulsifier to the flocculant is 10.3-15.8: 595.2-835.6: 0.8-1.6: 0.2 to 0.6;
the mass ratio of the ceramic fiber to the polyamide epichlorohydrin resin to the expansion powder is 525-750: 0.03-0.6: 70-85;
the expansion powder comprises inorganic powder and organic powder;
the inorganic powder comprises vermiculite and/or expanded perlite powder;
the organic powder comprises ammonium polyphosphate, pentaerythritol, melamine, hydroxymethyl cellulose and titanium dioxide;
the mass ratio of the inorganic powder to the organic powder is 50-60: 15-30;
in the acrylic emulsion, the concentration of the acrylic copolymer is 10-30 kg/m3；
The solid content of the acrylic emulsion is 50-60%, the pH value is 7-9, the viscosity is 100-500 mpa & s, and the glass transition temperature is less than 0 ℃.
2. The intumescent fire blanket of claim 1, wherein the mass ratio of acrylic emulsion to defoamer is 10-29: 0.3 to 0.8.
3. The intumescent blanket of claim 1 wherein said ceramic fibers comprise one or more of ceramic fiber blown cotton, ceramic fiber spun cotton, and ceramic fiber high alumina cotton;
the diameter of the ceramic fiber is 2-5 μm.
4. A method of making an intumescent fire blanket as claimed in claim 1, comprising the steps of:
A) uniformly mixing the acrylic acid mixture, the aqueous solution containing the ceramic fiber mixture, the sol containing the demulsifier and the sol containing the flocculant to obtain slurry;
B) forming the slurry by a papermaking process, and then performing surface sizing to obtain an intermediate product;
C) and drying the intermediate product, and covering non-woven fabrics on two sides of the dried intermediate product to obtain the intumescent fire blanket.
5. The method of making an intumescent blanket as claimed in claim 4, wherein in step B) said surface sizing comprises:
soaking the material formed by the papermaking process in acrylic emulsion;
in the acrylic emulsion, the concentration of the acrylic copolymer is 10-30 kg/m3；
The solid content of the acrylic emulsion is 50-60%, the pH value is 7-9, the viscosity is 100-500 mpa & s, and the glass transition temperature is less than 0 ℃.
6. The method for preparing the intumescent blanket of claim 4, wherein in step C), the temperature for drying is 100-150 ℃ and the time for drying is 1-4 h.
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