CN111118959A - Ceramic fiber paper with micro-nano alumina coating coated on surface and preparation method thereof - Google Patents
Ceramic fiber paper with micro-nano alumina coating coated on surface and preparation method thereof Download PDFInfo
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- CN111118959A CN111118959A CN202010033134.9A CN202010033134A CN111118959A CN 111118959 A CN111118959 A CN 111118959A CN 202010033134 A CN202010033134 A CN 202010033134A CN 111118959 A CN111118959 A CN 111118959A
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/06—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
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- 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
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/35—Polyalkenes, e.g. polystyrene
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- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
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- 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
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
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- 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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- 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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- D—TEXTILES; PAPER
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- 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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- 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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
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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
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
Abstract
The invention discloses ceramic fiber paper with a micro-nano alumina coating coated on the surface and a preparation method thereof, wherein the preparation method comprises the following steps: s1: preparing ceramic fiber paper: weighing ceramic fibers, washing and removing residues, adding a filler, a dispersant, a flocculant and a binder, mixing, pulping, forming by wet papermaking, and drying to obtain ceramic fiber paper; s2: preparing an alumina solution: adding a stabilizer into the boehmite aqueous solution; then adding a softener aqueous solution to obtain a stable synthetic alumina solution; s3: modifying the ceramic fiber paper coating: coating the synthetic alumina solution on the surface of the ceramic fiber paper, drying, calcining at high temperature, cooling, and packaging to obtain the ceramic fiber paper coated with the micro-nano alumina coating on the surface. According to the invention, a large amount of free silicon generated by ceramic fibers on the original base material of the ceramic fiber paper at a high temperature reacts with the micro-nano-grade aluminum oxide coated on the surface to form mullite, so that the original fiber structure of the fiber paper is well maintained, and the production requirement is met.
Description
Technical Field
The invention relates to the field of high-temperature heat insulation materials, in particular to ceramic fiber paper with a micro-nano alumina coating coated on the surface and a preparation method thereof.
Background
The traditional ceramic fiber paper is aluminum silicate ceramic fiber paper, comprises common type, standard type, high-aluminum type or zirconium-containing type ceramic fiber paper, is manufactured by common type ceramic fiber, standard ceramic fiber, high-aluminum type ceramic fiber or zirconium-containing type ceramic fiber through a vacuum forming wet process, and is widely applied to the production process of microcrystalline ceramics and foamed ceramics as a special heat insulation fiber material and a demolding heat insulation liner.
Generally, the production and calcination temperature of microcrystalline ceramics and foamed ceramics is below 1150 ℃, and the furnace of a sintering kiln does not contain alkaline cosolvent atmosphere such as potassium-sodium oxide and the like, so that the traditional ceramic fiber paper can completely meet the use condition; however, in the production and sintering of some high-end microcrystalline ceramics and foamed ceramics, because raw materials contain a lot of potassium-sodium oxides or iron rust oxides, an alkaline cosolvent atmosphere is generated in a kiln at high temperature, basic material ceramic fibers in the traditional ceramic fiber paper can be crystallized at high temperature to generate free silicon, and the free silicon can react under the action of the alkaline cosolvent, so that the pulverization of the ceramic fibers is accelerated, the ceramic fiber paper fails, and the molten ceramic leaks along the corners of a mold or is dissolved through the fiber paper serving as an isolation pad and release paper, so that the defects of products and the loss are increased on one hand; on the other hand, the solution penetrates through the isolation paper to cause corrosion of the setter plate for bearing the microcrystalline ceramic or the foamed ceramic, so that the setter plate is damaged at an accelerated speed; under more extreme conditions, in order to pursue more beautiful high-end products, some manufacturers set the production and calcination temperature value of the kiln to exceed 1200 ℃, and the kiln also contains alkaline cosolvent atmospheres such as potassium-sodium oxide, and under the condition, the traditional ceramic fiber paper can not meet the requirements of customers at all.
The alumina fiber paper is made of polycrystalline alumina short fibers or chopped alumina continuous fibers by a vacuum forming wet method. Although the polycrystalline alumina fiber is easy to form mullite phase at high temperature and can slow down the pulverization effect of an alkaline cosolvent on ceramic fiber, the short-cut continuous alumina fiber has the price which is 50-100 times that of common zirconium-containing fiber or high-alumina fiber, and the fiber paper made of the polycrystalline alumina fiber is good in use but cannot be normally used as the production isolation paper of microcrystalline ceramic and foamed ceramic; and because the fiber is brittle, the fiber is easy to cut short in the pulping process of papermaking, and after the organic binder for preparing the fiber paper is burnt at high temperature, the fiber paper is easy to break due to the short and brittle fiber, so that the fiber paper serving as the isolation liner fails.
Therefore, the development of a flexible ceramic fiber paper with high cost performance which can be used for producing microcrystalline ceramics and foamed ceramics at 1400 ℃ in an alkaline corrosive atmosphere is a problem which needs to be solved by the technical personnel in the field urgently.
Disclosure of Invention
The invention aims to provide ceramic fiber paper with a micro-nano alumina coating coated on the surface and a preparation method thereof, aiming at overcoming the defects in the prior art, so that a large amount of free silicon generated by ceramic fibers on an original base material of the ceramic fiber paper at high temperature reacts with the micro-nano alumina coated on the surface to form mullite, the pulverization process of the fibers is slowed, the original fiber structure of the fiber paper is well maintained, and the production requirement is met.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a preparation method of ceramic fiber paper with a micro-nano alumina coating coated on the surface, which comprises the following steps:
s1: preparing ceramic fiber paper: weighing ceramic fibers according to the components and mass percentage of the ceramic fiber paper, washing and removing slag, then adding a filler, a dispersant, a flocculant and a binder, mixing and pulping, forming by wet papermaking, and drying to obtain the ceramic fiber paper;
s2: preparing an alumina solution: preparing a boehmite aqueous solution by taking boehmite as an aluminum source, and adding a stabilizer to obtain a stable boehmite aqueous solution; then adding a softener aqueous solution, and stirring and mixing uniformly to obtain a stable synthetic alumina solution;
s3: modifying the ceramic fiber paper coating: and (3) coating the synthetic alumina solution prepared in the step S2 on the surface of the ceramic fiber paper prepared in the step S1 by adopting a dipping method or a spraying method, drying, calcining at high temperature, cooling to room temperature, and then rolling or slicing and packaging to obtain the ceramic fiber paper coated with the micro-nano alumina coating on the surface.
Preferably, in S1, the ceramic fiber paper includes the following components in parts by mass: 70-90 parts of ceramic fiber, 1-10 parts of filler, 1-10 parts of dispersant, 1-5 parts of flocculant and 5-10 parts of binder.
Preferably, the ceramic fiber is one or a mixture of two of a standard type, a high-purity type, a high-aluminum type, a zirconium-containing type and a polycrystalline alumina type; the filler is one or more of alum, bentonite clay, kaolin and magnesium aluminum silicate; the dispersing agent and the flocculating agent are one or more of polyacrylamide, polyvinyl alcohol and polyvinyl chloride; the binder is an acrylic latex.
Further preferably, the standard type ceramic fiber has a classification temperature of 1260 ℃, wherein Al is2O3The mass percentage of Al in the standard ceramic fiber is not less than 43 parts, Al2O3And SiO2The sum of the mass percentages of the standard ceramic fibers is not less than 97 parts; the high-purity ceramic fiber has a classification temperature of 1260 ℃, wherein Al2O3The percentage of Al in the high-purity ceramic fiber is not less than 44 parts2O3And SiO2The sum of the mass percentages of the high-purity ceramic fibers is not less than 98.5 parts; the high-alumina ceramic fiber has a classification temperature of 1300 ℃, wherein Al2O3The percentage of Al in the high-alumina ceramic fiber is not less than 52 parts by mass, and Al2O3And SiO2The sum of the mass percentages of the high-aluminum ceramic fibers is not less than 98.5 parts; (ii) a The classification temperature of the zirconium-containing ceramic fiber is 1430 ℃, wherein Al2O3、SiO2And ZrO2The sum of the mass percent of the zirconium-containing ceramic fiber is not less than 99 parts, and Al2O3And ZrO2The sum of the mass percentages of the zirconium-containing ceramic fibers is not less than 52 parts; the polycrystalline alumina type ceramic fiber has a classification temperature of 1600 ℃, wherein Al2O3The mass percentage of Al in the polycrystalline alumina ceramic fiber is not less than 72 parts2O3And SiO2The sum of the mass percentages of the polycrystalline alumina ceramic fibers is not less than 98.8 parts.
Preferably, in S1, the wet papermaking is cylinder-type papermaking or fourdrinier papermaking; the drying temperature is 90-130 ℃, and the water removal amount is 80-90%.
Preferably, in S2, the concentration of the boehmite aqueous solution is 4-10%, and the added stabilizer accounts for 1-5% of the mass of the boehmite; the stabilizer is HNO3One or more of HCl, citric acid, acrylic emulsion, ethylene glycol and ethyl acetate.
Preferably, in S2, the concentration of the aqueous solution of the softener is 3-5%, and the softener is one or more of polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone and polyethylene glycol.
Preferably, in S2, the mass ratio of the stable boehmite aqueous solution to the softener aqueous solution is 3-10: 1.
preferably, in S2, the stirring temperature is 85 to 95 ℃.
Preferably, in S3, the drying temperature is 100 ℃, and the drying time is 0.3-1 h; the calcination temperature is 300-500 ℃, and the calcination time is 0.3-1.5 h.
The invention also provides the ceramic fiber paper with the surface coated with the micro-nano alumina coating, which is prepared by the preparation method.
By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:
(1) according to the manufacturing method, the micro-nano alumina coating is coated on the conventional ceramic fiber paper by adopting a sol-gel method, so that a large amount of free silicon generated by ceramic fibers on the original base material of the ceramic fiber paper in an alkaline corrosive atmosphere and at a high temperature reacts with micro-nano alumina coated on the surface to form mullite, the pulverization process of the fibers is slow, the original fiber structure of the fiber paper is well kept, and the material is suitable for being used in a high-temperature kiln in the alkaline corrosive atmosphere; in addition, the coated alumina coating has certain softener, and the flexibility of the fiber paper is kept at a reasonable calcining temperature, so that the fiber paper can be folded and bent in multiple layers, and is suitable for being used in various occasions.
(2) The ceramic fiber paper coated with the micro-nano alumina coating prepared by the invention is not only suitable for the production and use of microcrystalline ceramics and foamed ceramics, but also can be used in other high-temperature industries with alkaline corrosive atmosphere, and has great application potential and use value.
Drawings
FIG. 1 is a flow diagram of a cylinder papermaking process of the present invention;
FIG. 2 is a flow diagram of a fourdrinier papermaking process of the present invention;
FIG. 3 is a schematic diagram of a ceramic fiber paper coating modification impregnation process of the present invention;
FIG. 4 is a schematic diagram of the ceramic fiber paper coating modification spraying method of the present invention.
Detailed Description
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention provides a preparation method of ceramic fiber paper with a micro-nano alumina coating coated on the surface, which comprises the following steps:
s1: preparing ceramic fiber paper: weighing ceramic fibers according to the components and mass percentage of the ceramic fiber paper, washing and removing slag, then adding a filler, a dispersant, a flocculant and a binder, mixing and pulping, forming paper by adopting a wet method shown in figures 1 and 2, and drying to obtain the ceramic fiber paper;
s2: preparing an alumina solution: preparing a boehmite aqueous solution by taking boehmite as an aluminum source, and adding a stabilizer to obtain a stable boehmite aqueous solution; then adding a softener aqueous solution, and stirring and mixing uniformly to obtain a stable synthetic alumina solution;
s3: modifying the ceramic fiber paper coating: and (3) coating the synthetic alumina solution prepared in the step S2 on the surface of the ceramic fiber paper prepared in the step S1 by adopting a dipping method or a spraying method as shown in figures 3 and 4, drying, calcining at a high temperature, cooling to room temperature, rolling or slicing and packaging to obtain the ceramic fiber paper coated with the micro-nano alumina coating on the surface.
As a preferred example, in S1, the ceramic fiber paper includes the following components in parts by mass: 70-90 parts of ceramic fiber, 1-10 parts of filler, 1-10 parts of dispersant, 1-5 parts of flocculant and 5-10 parts of binder; the ceramic fiber is one or a mixture of two of a standard type, a high-purity type, a high-aluminum type, a zirconium-containing type or a polycrystalline alumina type; the filler is one or more of alum, bentonite clay, kaolin and magnesium aluminum silicate; the dispersing agent and the flocculating agent are one or more of polyacrylamide, polyvinyl alcohol and polyvinyl chloride; the binder is an acrylic latex.
As a preferred example, in S1, as shown in fig. 1 and 2, the wet papermaking is a cylinder roll papermaking or a fourdrinier papermaking process; the drying temperature is 90-130 ℃, and the water removal amount is 80-90%; in S2, the concentration of the boehmite aqueous solution is 4-10%, and the added stabilizer accounts for 1-5% of the mass of the boehmite; the stabilizer is HNO3One or more of HCl, citric acid, acrylic emulsion, ethylene glycol and ethyl acetate; in S2, the concentration of the softener aqueous solution is 3-5%, and the softener is one or more of polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone and polyethylene glycol; in S2, the mass ratio of the stable boehmite aqueous solution to the softener aqueous solution is 3-10: 1; in S2, the stirring temperature is 85-95 ℃; in S3, the drying temperature is 100 ℃, and the drying time is 0.3-1 h; the calcination temperature is 300-500 ℃, and the calcination time is 0.3-1.5 h.
The manufacturing method of the invention adopts a sol-gel method to coat the micro-nano alumina coating on the conventional ceramic fiber paper, so that a great amount of free silicon generated by ceramic fibers on the original base material of the ceramic fiber paper in an alkaline corrosive atmosphere and at high temperature reacts with micro-nano alumina coated on the surface to form mullite, the pulverization process of the fibers becomes slow, the original fiber structure of the fiber paper is well maintained, and the material is suitable for being used in a high-temperature kiln in the alkaline corrosive atmosphere.
The invention also provides ceramic fiber paper coated with the micro-nano alumina coating on the surface, which is prepared according to the preparation method.
The alumina coating coated in the ceramic fiber paper coated with the micro-nano alumina coating prepared by the invention contains a certain softener, and the flexibility of the fiber paper is kept at a reasonable calcining temperature, so that the fiber paper can be folded and bent in multiple layers, and the application range is wider; the ceramic fiber paper coated with the micro-nano alumina coating is not only suitable for production and use of microcrystalline ceramics and foamed ceramics, but also can be used in other high-temperature industries with alkaline corrosive atmosphere, and has great application potential and use value.
Example 1
A preparation method of ceramic fiber paper with a micro-nano alumina coating coated on the surface comprises the following steps:
s1: preparing high-aluminum ceramic fiber paper: washing 85 parts of high-alumina ceramic fiber, removing slag, adding a filler mixed by 2.5 parts of alum and 2.5 parts of bentonite clay, pulping, adding 1 part of polyacrylamide, 1 part of polyvinyl alcohol and 8 parts of acrylic latex, pulping again, performing wet forming by adopting a fourdrinier papermaking process shown in figure 2, and drying and removing 80% of water at 110 ℃ by passing the wet-formed fiber paper through a primary oven to obtain the high-alumina ceramic fiber paper with the width of 1.8 m and the thickness of 3 mm;
s2: preparing an alumina solution: boehmite was used as an aluminum source, and the resulting solution was prepared as a 4% boehmite aqueous solution, to which HNO was added in an amount of 2% by mass of the boehmite3And ethyl acetate stabilizer accounting for 1 percent of the mass of the boehmite to obtain stable boehmite aqueous solution; polyvinyl alcohol is used as a softener and is prepared into 4% polyvinyl alcohol aqueous solution; mixing the stable boehmite aqueous solution and the polyvinyl alcohol aqueous solution according to the mass ratio of 10:1, uniformly stirring and mixing the two solutions at 95 ℃ by using a heating type magnetic stirrer to prepare a mixed solution, and continuously stirring the mixed solution to obtain a stable synthetic alumina solution;
s3: modifying the ceramic fiber paper coating: and (2) automatically feeding the high-alumina ceramic fiber paper prepared in the step (1) into a dipping area through a mesh belt, coating the synthetic alumina solution prepared in the step (2) on the surface of the high-alumina ceramic fiber paper by adopting a dipping method shown in figure 3, continuously dipping the high-alumina ceramic fiber paper in the synthetic alumina solution, automatically feeding the high-alumina ceramic fiber paper subjected to coating modification into an electric heating blast drying box through the mesh belt, drying at 100 ℃ for 0.7h, placing the dried high-alumina ceramic fiber paper in a box type resistance furnace, heating to 500 ℃, calcining for 0.8h, naturally cooling to room temperature after calcining is finished, thus obtaining the high-alumina ceramic fiber paper coated with the micro-nano alumina coating, and packaging after rolling.
The high-aluminum ceramic fiber paper with the surface coated with the micro-nano aluminum oxide coating is prepared according to the method.
Example 2
A preparation method of ceramic fiber paper with a micro-nano alumina coating coated on the surface comprises the following steps:
s1: preparing zirconium-containing ceramic fiber paper: washing 85 parts of zirconium-containing ceramic fiber, removing slag, adding a filler mixed by 3 parts of alum and 3 parts of bentonite clay, pulping, then adding 1.5 parts of polyacrylamide, 1.5 parts of polyvinyl alcohol and 6 parts of acrylic latex, pulping again, performing wet forming by adopting a fourdrinier papermaking process shown in figure 2, and drying and removing 90% of water from the wet-formed fiber paper at 110 ℃ by a primary oven to obtain the zirconium-containing ceramic fiber paper with the width of 1.4 m and the thickness of 2 mm;
s2: preparing an alumina solution: preparing a 6% boehmite aqueous solution by using boehmite as an aluminum source, and adding HCl accounting for 3% of the mass of the boehmite and an ethylene glycol stabilizer accounting for 1% of the mass of the boehmite to obtain a stable boehmite aqueous solution; polyvinylpyrrolidone is used as a softener and is prepared into a 5% polyvinylpyrrolidone water solution; mixing the stable boehmite aqueous solution and the polyvinylpyrrolidone aqueous solution according to the mass ratio of 10:1, uniformly stirring and mixing the two solutions at 95 ℃ by using a heating type magnetic stirrer to obtain a mixed solution, and continuously stirring the mixed solution to obtain a stable synthetic alumina solution;
s3: modifying the ceramic fiber paper coating: and (2) enabling the zirconium-containing ceramic fiber paper prepared in the step (1) to automatically enter a spraying area through a mesh belt, uniformly and continuously spraying the synthetic alumina solution prepared in the step (2) on the surface of the zirconium-containing ceramic fiber paper by using a spraying method shown in figure 4, completely soaking the zirconium-containing ceramic fiber paper in the synthetic alumina solution, enabling the zirconium-containing ceramic fiber paper modified by the coating to automatically enter an electric heating blast drying box through the mesh belt, drying at 100 ℃ for 0.6h, placing the dried zirconium-containing ceramic fiber paper in a box type resistance furnace, heating to 400 ℃, calcining for 0.7h, naturally cooling to room temperature after calcining is finished, thus obtaining the zirconium-containing ceramic fiber paper coated with the micro-nano alumina coating, and packaging after slicing.
The zirconium-containing ceramic fiber paper with the surface coated with the micro-nano alumina coating is prepared according to the method.
Example 3
A preparation method of ceramic fiber paper with a micro-nano alumina coating coated on the surface comprises the following steps:
s1: preparing standard type ceramic fiber paper: washing 85 parts of standard ceramic fiber, removing slag, adding a filler mixed by 2.5 parts of alum and 2.5 parts of bentonite clay, pulping, adding 1 part of polyacrylamide, 1 part of polyvinyl alcohol and 8 parts of acrylic latex, pulping again, performing wet forming by adopting a fourdrinier papermaking process shown in figure 2, and drying and removing 80-90% of water from the wet-formed fiber paper at 110 ℃ by a primary oven to obtain the standard ceramic fiber paper with the width of 1.8 m and the thickness of 3 mm;
s2: preparing an alumina solution: boehmite was used as an aluminum source, and the resulting solution was prepared as a 4% boehmite aqueous solution, to which HNO was added in an amount of 2% by mass of the boehmite3And ethyl acetate stabilizer accounting for 1 percent of the mass of the boehmite to obtain stable boehmite aqueous solution; polyvinyl alcohol is used as a softener and is prepared into a 4% polyvinyl alcohol aqueous solution; mixing the stable boehmite aqueous solution and the polyvinyl alcohol aqueous solution according to the mass ratio of 10:1, uniformly stirring and mixing the two solutions at 95 ℃ by using a heating type magnetic stirrer to prepare a mixed solution, and continuously stirring the mixed solution to obtain a stable synthetic alumina solution;
s3: modifying the ceramic fiber paper coating: and (2) automatically feeding the standard type ceramic fiber paper prepared in the step (1) into a dipping area through a mesh belt, coating the synthetic alumina solution prepared in the step (2) on the surface of the standard type ceramic fiber paper by adopting a dipping method shown in figure 4, continuously dipping the standard type ceramic fiber paper in the synthetic alumina solution, automatically feeding the standard type ceramic fiber paper subjected to coating modification into an electric heating forced air drying box through the mesh belt, drying at 100 ℃ for 0.7h, placing the dried standard type ceramic fiber paper in a box-type resistance furnace, heating to 500 ℃, calcining for 0.8h, naturally cooling to room temperature after calcining is finished, thus obtaining the standard type ceramic fiber paper coated with the micro-nano alumina coating, and packaging after rolling.
The standard type ceramic fiber paper with the surface coated with the micro-nano alumina coating is prepared according to the method.
Application example:
the fiber paper coated successfully in the coating layers of the examples 1 to 3 is compared with the original fiber paper under the condition of 1350 ℃: two round holes are carved by a 50mm polycrystalline alumina fiber board (200 mm) which can be used at 1600 ℃ for a long time, two layers of fiber paper (100mm 200 mm) with the thickness of 2mm are covered and placed on the positions of the corresponding round holes at the bottom of the fiber board, microcrystalline ceramic raw materials containing potassium and sodium oxide provided by customers are placed in the round holes, and the fiber board is covered by a fiber board with the same size. The sandwich-type fiberboard is placed in a high-temperature calcining furnace, and the heat preservation is carried out for 36 hours at 1350 ℃ under the simulation of the actual situation on site. Then taking out the sample for comparison, and finding that one layer of the original fiber paper is completely dissolved and penetrated, and the corrosion of the second layer of the fiber paper is nearly one third; and the first layer of fiber in the fiber paper coated successfully by the coating is not dissolved through, and the first layer of fiber paper is only soaked by one third after being taken away, so that the effect of isolating and demoulding is completely achieved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of ceramic fiber paper with a micro-nano alumina coating coated on the surface is characterized by comprising the following steps:
s1: preparing ceramic fiber paper: weighing ceramic fibers according to the components and mass percentage of the ceramic fiber paper, washing and removing slag, then adding a filler, a dispersant, a flocculant and a binder, mixing and pulping, forming by wet papermaking, and drying to obtain the ceramic fiber paper;
s2: preparing an alumina solution: preparing a boehmite aqueous solution by taking boehmite as an aluminum source, and adding a stabilizer to obtain a stable boehmite aqueous solution; then adding a softener aqueous solution, and stirring and mixing uniformly to obtain a stable synthetic alumina solution;
s3: modifying the ceramic fiber paper coating: and (3) coating the synthetic alumina solution prepared in the step S2 on the surface of the ceramic fiber paper prepared in the step S1 by adopting a dipping method or a spraying method, drying, calcining at high temperature, cooling to room temperature, and then rolling or slicing and packaging to obtain the ceramic fiber paper coated with the micro-nano alumina coating on the surface.
2. The preparation method according to claim 1, wherein in S1, the ceramic fiber paper comprises the following components in parts by mass: 70-90 parts of ceramic fiber, 1-10 parts of filler, 1-10 parts of dispersant, 1-5 parts of flocculant and 5-10 parts of binder.
3. The preparation method according to claim 2, wherein the ceramic fiber is one or a mixture of standard type, high purity type, high alumina type, zirconium-containing type or polycrystalline alumina; the filler is one or more of alum, bentonite clay, kaolin and magnesium aluminum silicate; the dispersing agent and the flocculating agent are one or more of polyacrylamide, polyvinyl alcohol and polyvinyl chloride; the binder is an acrylic latex.
4. The method according to claim 1, wherein in S1, the wet papermaking is a cylinder or fourdrinier papermaking process; the drying temperature is 90-130 ℃, and the water removal amount is 80-90%.
5. The method of claim 1, wherein in S2, the concentration of the boehmite aqueous solution is 4-10%, and the stabilizer is added in an amount of 1-5% by mass of boehmite; the stabilizer is HNO3One or more of HCl, citric acid, acrylic emulsion, ethylene glycol and ethyl acetate.
6. The preparation method according to claim 1, wherein in S2, the concentration of the aqueous solution of the softener is 3-5%, and the softener is one or more of polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone and polyethylene glycol.
7. The preparation method of claim 1, wherein in S2, the mass ratio of the stable boehmite aqueous solution to the softener aqueous solution is 3-10: 1.
8. the method according to claim 1, wherein the stirring temperature in S2 is 85-95 ℃.
9. The method according to claim 1, wherein in S3, the drying temperature is 100 ℃ and the drying time is 0.3-1 h; the calcination temperature is 300-500 ℃, and the calcination time is 0.3-1.5 h.
10. Ceramic fiber paper with a micro-nano alumina coating coated on the surface, prepared by the preparation method according to any one of claims 1 to 9.
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| CN111621175A (en) * | 2020-06-03 | 2020-09-04 | 山东民烨耐火纤维有限公司 | Ceramic fiber coating containing nano-alumina |
| CN113337148A (en) * | 2021-06-09 | 2021-09-03 | 黄山钛可磨工业介质有限公司 | Environment-friendly water-based anticorrosive coating for autoclaved aerated concrete slab steel bars |
| CN113603502A (en) * | 2021-08-19 | 2021-11-05 | 安徽紫朔环境工程技术有限公司 | Ceramic fiber filter tube forming process |
| CN113764821A (en) * | 2021-09-08 | 2021-12-07 | 山东工业陶瓷研究设计院有限公司 | Boron nitride fiber diaphragm, diaphragm preparation method and lithium thermal battery |
| WO2022129704A1 (en) * | 2020-12-18 | 2022-06-23 | Ahlstrom-Munksjö Oyj | A filter media |
| EP4029589A1 (en) * | 2021-01-14 | 2022-07-20 | Ahlstrom-Munksjö Oyj | A filter media |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111621175A (en) * | 2020-06-03 | 2020-09-04 | 山东民烨耐火纤维有限公司 | Ceramic fiber coating containing nano-alumina |
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