CN114853491B - Dustproof and easy-to-clean ceramic sheet and preparation method thereof - Google Patents
Dustproof and easy-to-clean ceramic sheet and preparation method thereof Download PDFInfo
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- CN114853491B CN114853491B CN202210299993.1A CN202210299993A CN114853491B CN 114853491 B CN114853491 B CN 114853491B CN 202210299993 A CN202210299993 A CN 202210299993A CN 114853491 B CN114853491 B CN 114853491B
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- 239000000919 ceramic Substances 0.000 title claims abstract description 38
- 230000003670 easy-to-clean Effects 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910052582 BN Inorganic materials 0.000 claims abstract description 82
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 82
- 238000004140 cleaning Methods 0.000 claims abstract description 51
- 238000005245 sintering Methods 0.000 claims abstract description 41
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 40
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 40
- 239000000654 additive Substances 0.000 claims abstract description 37
- 230000000996 additive effect Effects 0.000 claims abstract description 37
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 30
- 238000000227 grinding Methods 0.000 claims abstract description 28
- 239000003607 modifier Substances 0.000 claims abstract description 23
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 19
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 claims abstract description 18
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910002113 barium titanate Inorganic materials 0.000 claims abstract description 18
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 18
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 18
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010436 fluorite Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 47
- 239000000463 material Substances 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 26
- 238000009210 therapy by ultrasound Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 22
- 238000005406 washing Methods 0.000 claims description 19
- 238000001354 calcination Methods 0.000 claims description 18
- 230000005855 radiation Effects 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 230000006872 improvement Effects 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 239000000839 emulsion Substances 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910021389 graphene Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- -1 rare earth lanthanum chloride Chemical class 0.000 claims description 8
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 8
- CXRFDZFCGOPDTD-UHFFFAOYSA-M Cetrimide Chemical compound [Br-].CCCCCCCCCCCCCC[N+](C)(C)C CXRFDZFCGOPDTD-UHFFFAOYSA-M 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 7
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 7
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 238000002715 modification method Methods 0.000 claims description 7
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 229920001661 Chitosan Polymers 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 238000000465 moulding Methods 0.000 abstract description 2
- 230000001678 irradiating effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 11
- 238000000498 ball milling Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000000428 dust Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 241000276425 Xiphophorus maculatus Species 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000006012 monoammonium phosphate Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
- C04B2235/3472—Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
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- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
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Abstract
The invention discloses a dustproof and easy-to-clean ceramic sheet which comprises the following raw materials in parts by weight: 20-30 parts of cordierite, 15-25 parts of fluorite, 5-10 parts of potassium feldspar, 3-6 parts of self-cleaning additive, 1-2 parts of barium titanate sintering aid, 0.2-0.6 part of talcum powder and 0.1-0.3 part of modified nano silicon dioxide. The ceramic sheet is prepared by mixing cordierite, fluorite, potassium feldspar, talcum powder and other raw materials, sintering and molding the raw materials through a barium titanate sintering aid, adding a self-cleaning additive and modified nano silicon dioxide to strengthen the easy cleaning effect of a product, irradiating the self-cleaning additive by mullite fiber to improve the activity, modifying the raw materials in a flaky boron nitride modifier, thermally modifying and grinding to form a composite body, arranging the acicular mullite fiber on the flaky boron nitride, and forming uniform pollution-resistant and self-cleaning points on the surface of the sheet, thereby being convenient to clean.
Description
Technical Field
The invention relates to the technical field of ceramic thin plates, in particular to a dustproof and easy-to-clean ceramic thin plate and a preparation method thereof.
Background
The ceramic sheet has the characteristics of energy conservation, consumption reduction, resource conservation, light weight, good fire resistance and the like, can replace the traditional heavy wall-mounted ceramic sheet, is light in material, convenient to transport, small in pulling force on a wall body, can lighten the load of the wall body, and has wide application prospect. However, the ceramic sheet has more technical problems in the processing and using processes due to large area and thin thickness, and the problems of dust prevention and cleaning are particularly remarkable. Along with the continuous improvement of the requirements of high-rise curtain walls, high-end home decoration, high-end meeting, national public places and the like on safety guarantee, the environmental protection and cleaning of ceramic thin plates for decoration are in great demand for better improvement.
The strength performance of the ceramic thin plate is improved, and little convenient cleaning and dust removal function improvement are researched.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a dustproof and easy-to-clean ceramic sheet and a preparation method thereof, so as to solve the problems in the prior art.
The invention solves the technical problems by adopting the following technical scheme:
the invention provides a dustproof and easy-to-clean ceramic sheet which comprises the following raw materials in parts by weight:
20-30 parts of cordierite, 15-25 parts of fluorite, 5-10 parts of potassium feldspar, 3-6 parts of self-cleaning additive, 1-2 parts of barium titanate sintering aid, 0.2-0.6 part of talcum powder and 0.1-0.3 part of modified nano silicon dioxide.
Preferably, the dustproof and easy-to-clean ceramic sheet is prepared from the following raw materials in parts by weight:
25 parts of cordierite, 20 parts of fluorite, 7.5 parts of potassium feldspar, 4.5 parts of self-cleaning additive, 1.5 parts of barium titanate sintering aid, 0.4 part of talcum powder and 0.2 part of modified nano silicon dioxide.
Preferably, the preparation method of the self-cleaning additive comprises the following steps:
s1: firstly, placing mullite fiber in a radiation field for radiation treatment, wherein the radiation adopts proton irradiation, the irradiation dose is 40-100kGy, and the irradiation is finished to obtain irradiation modified mullite fiber;
s2: feeding the irradiation modified mullite fiber into a 2-3 times flaky boron nitride modifier for stirring and dispersing, wherein the stirring speed is 500-600r/min, the stirring time is 45-55min, the stirring temperature is 75-85 ℃, and the stirring is finished, and the mullite-flaky boron nitride composite material is obtained after washing and drying;
s3: performing heat improvement treatment on the mullite-flaky boron nitride composite material, and finally air-cooling to room temperature to obtain a mullite-flaky boron nitride improved body;
s4: and (3) conveying the mullite-flaky boron nitride improved body into a grinding machine for grinding, wherein the grinding speed is 2000-2500r/min, the grinding time is 35-45min, and the self-cleaning additive is obtained after the grinding is finished.
Preferably, the specific operation steps of the heat improvement treatment are as follows: firstly, the mixture is sent to a temperature of 300-350 ℃ for calcination for 15-25min, and after the calcination is finished, the mixture is cooled to 200-220 ℃ at a speed of 1-3 ℃/min.
Preferably, the preparation method of the flaky boron nitride modifier comprises the following steps:
s1: adding chitosan and 1-5% of r-aminopropyl triethoxysilane according to the total amount of 10-20% of the acrylate emulsion, stirring until the mixture is fully mixed, then adding hydrochloric acid to adjust the pH of the solution to 5.0-6.0, then adding tetradecyl trimethyl ammonium bromide accounting for 0.2-0.5% of the total amount of the acrylate emulsion, and continuing to stir fully to obtain a modified liquid;
s2: performing cold-heat treatment on the flaky boron nitride, and obtaining the shaped flaky boron nitride after the treatment is finished;
s3: and (3) sending the shaped flaky boron nitride into a modifying liquid according to the weight ratio of 1:5 for ultrasonic treatment, wherein the ultrasonic power is 100-300W, the ultrasonic time is 45-55min, and the flaky boron nitride modifier is obtained after ultrasonic treatment, water washing and drying.
Preferably, the cold-heat treatment method of the flaky boron nitride comprises the following steps: preheating at 45-65deg.C for 10-20min, heating to 150-170deg.C at a rate of 4-5deg.C/s, keeping the temperature for 5-10min, air cooling to room temperature, refrigerating at-5deg.C for 2-6min, cooling, storing at room temperature for use, recovering to room temperature, and heating to 60-70deg.C for use.
Preferably, the thickness of the flaky boron nitride is 1-1.5um, and the flaky diameter is 2-3um; the diameter of the mullite fiber is 2-6um, and the length-diameter ratio is 10-30.
Preferably, the modification method of the modified nano silicon dioxide comprises the following steps:
15-25 parts of nano silicon dioxide is added into absolute ethyl alcohol according to the weight ratio of 1:3 for uniform dispersion, then 2-6 parts of monoammonium phosphate aqueous solution with the molar concentration of 0.12-0.18mol/L and 1-3 parts of silane coupling agent KH560 are added, then 1-3 parts of rare earth lanthanum chloride solution with the mass fraction of 1-4% are added, ultrasonic treatment is carried out for 25-35min at the power of 500-600W, and after ultrasonic treatment, water washing and drying are carried out, thus obtaining the modified nano silicon dioxide.
The invention provides a preparation method of a dustproof and easy-to-clean ceramic sheet, which comprises the following steps:
sequentially adding cordierite, fluorite, potassium feldspar, a self-cleaning additive, a barium titanate sintering aid, talcum powder and modified nano silicon dioxide into a stirrer, mixing and stirring thoroughly, then sending into a ball mill for ball milling, passing through 200 meshes, and then pre-pressing at 4000-5000 tons/m and 3-6mm of pressing thickness;
step two, calcining and sintering treatment is carried out, the sintering temperature is 1360-1370 ℃, sintering is carried out for 2-3 hours, and cooling to room temperature is finished;
and thirdly, spraying the easily cleaned material with the thickness of 1-3mm on the surface of the sintered material in the second step, drying for 20-30min at the temperature of 110-120 ℃, and obtaining the ceramic sheet.
Preferably, the preparation method of the easy-to-clean material comprises the following steps: 10-20 parts of epoxy resin, 1-3 parts of graphene, 15-25 parts of acetone and 2-5 parts of polyethylene glycol are mixed according to parts by weight, and the mixture is fully mixed to obtain the easily-cleaned material.
Compared with the prior art, the invention has the following beneficial effects:
the ceramic sheet is formed by mixing cordierite, fluorite, potassium feldspar, talcum powder and other raw materials, sintering and molding the raw materials through a barium titanate sintering aid, the added self-cleaning additive and modified nano silicon dioxide are matched to enhance the easy cleaning effect of the product, the self-cleaning additive is irradiated by mullite fibers to improve the activity, the modification treatment is performed in a flaky boron nitride modifier, the composite body formed by thermal modification and grinding is formed, the acicular mullite fibers are arranged on the flaky boron nitride, and uniform pollution-resistant and self-cleaning points are formed on the surface of the sheet, so that the cleaning is convenient, the modified nano silicon dioxide is matched, the self-cleaning effect of the product is enhanced by the nano silicon dioxide, in addition, the hydrophilic and pollution-resistant layers formed by the raw materials such as epoxy resin and graphene are sprayed on the surface of the sintered material, and the hydrophilic mechanism formed by the graphene is convenient for further self-cleaning treatment by combining water molecules, so that the self-cleaning efficiency is improved.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The dustproof easy-to-clean ceramic sheet comprises the following raw materials in parts by weight:
20-30 parts of cordierite, 15-25 parts of fluorite, 5-10 parts of potassium feldspar, 3-6 parts of self-cleaning additive, 1-2 parts of barium titanate sintering aid, 0.2-0.6 part of talcum powder and 0.1-0.3 part of modified nano silicon dioxide.
The dustproof and easy-to-clean ceramic sheet of the embodiment comprises the following raw materials in parts by weight:
25 parts of cordierite, 20 parts of fluorite, 7.5 parts of potassium feldspar, 4.5 parts of self-cleaning additive, 1.5 parts of barium titanate sintering aid, 0.4 part of talcum powder and 0.2 part of modified nano silicon dioxide.
The preparation method of the self-cleaning additive of the embodiment comprises the following steps:
s1: firstly, placing mullite fiber in a radiation field for radiation treatment, wherein the radiation adopts proton irradiation, the irradiation dose is 40-100kGy, and the irradiation is finished to obtain irradiation modified mullite fiber;
s2: feeding the irradiation modified mullite fiber into a 2-3 times flaky boron nitride modifier for stirring and dispersing, wherein the stirring speed is 500-600r/min, the stirring time is 45-55min, the stirring temperature is 75-85 ℃, and the stirring is finished, and the mullite-flaky boron nitride composite material is obtained after washing and drying;
s3: performing heat improvement treatment on the mullite-flaky boron nitride composite material, and finally air-cooling to room temperature to obtain a mullite-flaky boron nitride improved body;
s4: and (3) conveying the mullite-flaky boron nitride improved body into a grinding machine for grinding, wherein the grinding speed is 2000-2500r/min, the grinding time is 35-45min, and the self-cleaning additive is obtained after the grinding is finished.
The specific operation steps of the heat improvement treatment of the embodiment are as follows: firstly, the mixture is sent to a temperature of 300-350 ℃ for calcination for 15-25min, and after the calcination is finished, the mixture is cooled to 200-220 ℃ at a speed of 1-3 ℃/min.
The preparation method of the flaky boron nitride modifier in the embodiment comprises the following steps:
s1: adding chitosan and 1-5% of r-aminopropyl triethoxysilane according to the total amount of 10-20% of the acrylate emulsion, stirring until the mixture is fully mixed, then adding hydrochloric acid to adjust the pH of the solution to 5.0-6.0, then adding tetradecyl trimethyl ammonium bromide accounting for 0.2-0.5% of the total amount of the acrylate emulsion, and continuing to stir fully to obtain a modified liquid;
s2: performing cold-heat treatment on the flaky boron nitride, and obtaining the shaped flaky boron nitride after the treatment is finished;
s3: and (3) sending the shaped flaky boron nitride into a modifying liquid according to the weight ratio of 1:5 for ultrasonic treatment, wherein the ultrasonic power is 100-300W, the ultrasonic time is 45-55min, and the flaky boron nitride modifier is obtained after ultrasonic treatment, water washing and drying.
The cold-heat treatment method of the flaky boron nitride in the embodiment comprises the following steps: preheating at 45-65deg.C for 10-20min, heating to 150-170deg.C at a rate of 4-5deg.C/s, keeping the temperature for 5-10min, air cooling to room temperature, refrigerating at-5deg.C for 2-6min, cooling, storing at room temperature for use, recovering to room temperature, and heating to 60-70deg.C for use.
The thickness of the flaky boron nitride is 1-1.5um, and the flaky diameter is 2-3um; the diameter of the mullite fiber is 2-6um, and the length-diameter ratio is 10-30.
The modification method of the modified nano silicon dioxide in the embodiment comprises the following steps:
15-25 parts of nano silicon dioxide is added into absolute ethyl alcohol according to the weight ratio of 1:3 for uniform dispersion, then 2-6 parts of monoammonium phosphate aqueous solution with the molar concentration of 0.12-0.18mol/L and 1-3 parts of silane coupling agent KH560 are added, then 1-3 parts of rare earth lanthanum chloride solution with the mass fraction of 1-4% are added, ultrasonic treatment is carried out for 25-35min at the power of 500-600W, and after ultrasonic treatment, water washing and drying are carried out, thus obtaining the modified nano silicon dioxide.
The preparation method of the dustproof and easy-to-clean ceramic sheet comprises the following steps of:
sequentially adding cordierite, fluorite, potassium feldspar, a self-cleaning additive, a barium titanate sintering aid, talcum powder and modified nano silicon dioxide into a stirrer, mixing and stirring thoroughly, then sending into a ball mill for ball milling, passing through 200 meshes, and then pre-pressing at 4000-5000 tons/m and 3-6mm of pressing thickness;
step two, calcining and sintering treatment is carried out, the sintering temperature is 1360-1370 ℃, sintering is carried out for 2-3 hours, and cooling to room temperature is finished;
and thirdly, spraying the easily cleaned material with the thickness of 1-3mm on the surface of the sintered material in the second step, drying for 20-30min at the temperature of 110-120 ℃, and obtaining the ceramic sheet.
The preparation method of the easy-to-clean material comprises the following steps: 10-20 parts of epoxy resin, 1-3 parts of graphene, 15-25 parts of acetone and 2-5 parts of polyethylene glycol are mixed according to parts by weight, and the mixture is fully mixed to obtain the easily-cleaned material.
Example 1.
The dustproof easy-to-clean ceramic sheet comprises the following raw materials in parts by weight:
20 parts of cordierite, 15 parts of fluorite, 5 parts of potassium feldspar, 3 parts of self-cleaning additive, 1 part of barium titanate sintering aid, 0.2 part of talcum powder and 0.1 part of modified nano silicon dioxide.
The preparation method of the self-cleaning additive of the embodiment comprises the following steps:
s1: the mullite fiber is firstly placed in a radiation field for radiation treatment, proton irradiation is adopted for radiation, the irradiation dose is 40kGy, and the irradiation is finished, so that the irradiation modified mullite fiber is obtained;
s2: feeding the irradiation modified mullite fiber into a 2-time flaky boron nitride modifier for stirring and dispersing, wherein the stirring speed is 500r/min, the stirring time is 45min, the stirring temperature is 75 ℃, and the mullite-flaky boron nitride composite material is obtained after water washing and drying after the stirring;
s3: performing heat improvement treatment on the mullite-flaky boron nitride composite material, and finally air-cooling to room temperature to obtain a mullite-flaky boron nitride improved body;
s4: and (3) conveying the mullite-flaky boron nitride improved body into a grinder for grinding, wherein the grinding speed is 2000r/min, the grinding time is 35min, and the self-cleaning additive is obtained after the grinding is finished.
The specific operation steps of the heat improvement treatment of the embodiment are as follows: the mixture is firstly sent to 300 ℃ for calcination for 15min, and is cooled to 200 ℃ at 1 ℃/min after the calcination is finished.
The preparation method of the flaky boron nitride modifier in the embodiment comprises the following steps:
s1: adding chitosan and 1% of r-aminopropyl triethoxysilane according to the amount of 10% of the total acrylate emulsion, stirring until the mixture is fully mixed, then adding hydrochloric acid to adjust the pH of the solution to 5.0, then adding tetradecyl trimethyl ammonium bromide accounting for 0.2% of the total acrylate emulsion, and continuously stirring the mixture fully to obtain a modified liquid;
s2: performing cold-heat treatment on the flaky boron nitride, and obtaining the shaped flaky boron nitride after the treatment is finished;
s3: and (3) sending the shaped flaky boron nitride into a modifying liquid according to the weight ratio of 1:5 for ultrasonic treatment, wherein the ultrasonic power is 100W, the ultrasonic time is 45min, and the flaky boron nitride modifier is obtained after ultrasonic treatment, water washing and drying.
The cold-heat treatment method of the flaky boron nitride in the embodiment comprises the following steps: preheating at 45 ℃ for 10min, heating to 150 ℃ at the speed of 4 ℃/s, continuously preserving heat for 5min, air-cooling to room temperature, refrigerating at-5 ℃ for 2min, cooling, preserving at room temperature for standby, recovering to room temperature, and heating to 60 ℃ for standby.
The thickness of the flaky boron nitride in the embodiment is 1um, and the flaky diameter is 2um; the mullite fiber has a diameter of 2um and an aspect ratio of 10.
The modification method of the modified nano silicon dioxide in the embodiment comprises the following steps:
15 parts of nano silicon dioxide is added into absolute ethyl alcohol according to the weight ratio of 1:3 for uniform dispersion, then 2 parts of ammonium dihydrogen phosphate aqueous solution with the molar concentration of 0.12mol/L and 1 part of silane coupling agent KH560 are added, then 1 part of rare earth lanthanum chloride solution with the mass fraction of 1% are added, ultrasonic treatment is carried out for 25min with the power of 500W, ultrasonic treatment is finished, and water washing and drying are carried out, thus obtaining the modified nano silicon dioxide.
The preparation method of the dustproof and easy-to-clean ceramic sheet comprises the following steps of:
sequentially adding cordierite, fluorite, potassium feldspar, a self-cleaning additive, a barium titanate sintering aid, talcum powder and modified nano silicon dioxide into a stirrer, mixing and stirring thoroughly, then sending into a ball mill for ball milling, passing through 200 meshes, and then pre-pressing at 4000 tons/m and 3mm in pressing thickness;
step two, calcining and sintering treatment is carried out, the sintering temperature is 1360 ℃, sintering is carried out for 2 hours, and cooling to room temperature is carried out after sintering;
and thirdly, spraying the easily cleaned material with the thickness of 1mm on the surface of the sintered material in the second step, drying for 20min at the temperature of 110 ℃, and obtaining the ceramic sheet.
The preparation method of the easy-to-clean material comprises the following steps: 10 parts of epoxy resin, 1 part of graphene, 15 parts of acetone and 2 parts of polyethylene glycol are mixed according to parts by weight, and the mixture is fully mixed to obtain the easily-cleaned material.
Example 2.
The dustproof easy-to-clean ceramic sheet comprises the following raw materials in parts by weight:
30 parts of cordierite, 25 parts of fluorite, 10 parts of potassium feldspar, 6 parts of self-cleaning additive, 2 parts of barium titanate sintering aid, 0.6 part of talcum powder and 0.3 part of modified nano silicon dioxide.
The preparation method of the self-cleaning additive of the embodiment comprises the following steps:
s1: the mullite fiber is firstly placed in a radiation field for radiation treatment, proton irradiation is adopted for radiation, the irradiation dose is 100kGy, and the irradiation is finished, so that the irradiation modified mullite fiber is obtained;
s2: feeding the irradiation modified mullite fiber into a 3-time flaky boron nitride modifier for stirring and dispersing, wherein the stirring speed is 600r/min, the stirring time is 55min, the stirring temperature is 85 ℃, and the mullite-flaky boron nitride composite material is obtained after water washing and drying after the stirring is finished;
s3: performing heat improvement treatment on the mullite-flaky boron nitride composite material, and finally air-cooling to room temperature to obtain a mullite-flaky boron nitride improved body;
s4: and (3) conveying the mullite-flaky boron nitride improved body into a grinder for grinding, wherein the grinding speed is 2500r/min, the grinding time is 45min, and the self-cleaning additive is obtained after the grinding is finished.
The specific operation steps of the heat improvement treatment of the embodiment are as follows: the mixture is firstly sent to 350 ℃ for calcination for 25min, and is cooled to 220 ℃ at 3 ℃/min after the calcination is finished.
The preparation method of the flaky boron nitride modifier in the embodiment comprises the following steps:
s1: adding chitosan and r-aminopropyl triethoxysilane accounting for 20% of the total amount of the acrylate emulsion, stirring until the mixture is fully mixed, adding hydrochloric acid to adjust the pH of the solution to 6.0, adding tetradecyl trimethyl ammonium bromide accounting for 0.5% of the total amount of the acrylate emulsion, and continuously stirring the mixture fully to obtain a modified liquid;
s2: performing cold-heat treatment on the flaky boron nitride, and obtaining the shaped flaky boron nitride after the treatment is finished;
s3: and (3) sending the shaped flaky boron nitride into a modifying liquid according to the weight ratio of 1:5 for ultrasonic treatment, wherein the ultrasonic power is 300W, the ultrasonic time is 55min, and the flaky boron nitride modifier is obtained after ultrasonic treatment, water washing and drying.
The cold-heat treatment method of the flaky boron nitride in the embodiment comprises the following steps: preheating at 65 ℃ for 20min, heating to 170 ℃ at a speed of 5 ℃/s, continuously preserving heat for 10min, air-cooling to room temperature, refrigerating at-5 ℃ for 6min, cooling, preserving at room temperature for later use, recovering to room temperature, and heating to 70 ℃ for later use.
The thickness of the flaky boron nitride in the embodiment is 1.5um, and the flaky diameter is 3um; the mullite fiber has a diameter of 6um and an aspect ratio of 30.
The modification method of the modified nano silicon dioxide in the embodiment comprises the following steps:
adding 25 parts of nano silicon dioxide into absolute ethyl alcohol according to a weight ratio of 1:3 for uniform dispersion, then adding 6 parts of ammonium dihydrogen phosphate aqueous solution with a molar concentration of 0.18mol/L and 3 parts of silane coupling agent KH560, then adding 3 parts of rare earth lanthanum chloride solution with a mass fraction of 4%, carrying out ultrasonic treatment with a power of 600W for 35min, ending ultrasonic treatment, washing with water, and drying to obtain the modified nano silicon dioxide.
The preparation method of the dustproof and easy-to-clean ceramic sheet comprises the following steps of:
sequentially adding cordierite, fluorite, potassium feldspar, a self-cleaning additive, a barium titanate sintering aid, talcum powder and modified nano silicon dioxide into a stirrer, mixing and stirring thoroughly, then sending into a ball mill for ball milling, passing through 200 meshes, and then pre-pressing at a pressing pressure of 5000 tons/m and a pressing thickness of 6mm;
step two, calcining and sintering treatment is carried out, the sintering temperature is 1370 ℃, sintering is carried out for 3 hours, and cooling to room temperature is carried out after sintering is finished;
and thirdly, spraying the easily cleaned material with the thickness of 3mm on the surface of the sintered material in the second step, drying for 30min at 120 ℃, and obtaining the ceramic sheet.
The preparation method of the easy-to-clean material comprises the following steps: and mixing 20 parts of epoxy resin, 3 parts of graphene, 25 parts of acetone and 5 parts of polyethylene glycol according to parts by weight, and fully mixing to obtain the easily cleaned material.
Example 3.
The dustproof easy-to-clean ceramic sheet comprises the following raw materials in parts by weight:
25 parts of cordierite, 20 parts of fluorite, 7.5 parts of potassium feldspar, 4.5 parts of self-cleaning additive, 1.5 parts of barium titanate sintering aid, 0.4 part of talcum powder and 0.2 part of modified nano silicon dioxide.
The preparation method of the self-cleaning additive of the embodiment comprises the following steps:
s1: the mullite fiber is firstly placed in a radiation field for radiation treatment, proton irradiation is adopted for radiation, the irradiation dose is 70kGy, and the irradiation is finished, so that the irradiation modified mullite fiber is obtained;
s2: feeding the irradiation modified mullite fiber into a 2.5 times flaky boron nitride modifier for stirring and dispersing, wherein the stirring speed is 550r/min, the stirring time is 50min, the stirring temperature is 80 ℃, the stirring is finished, and the mullite-flaky boron nitride composite material is obtained by washing and drying;
s3: performing heat improvement treatment on the mullite-flaky boron nitride composite material, and finally air-cooling to room temperature to obtain a mullite-flaky boron nitride improved body;
s4: and (3) conveying the mullite-flaky boron nitride improved body into a grinder for grinding, wherein the grinding speed is 2250r/min, the grinding time is 40min, and the self-cleaning additive is obtained after the grinding is finished.
Preferably, the specific operation steps of the heat improvement treatment are as follows: the mixture is firstly sent to 325 ℃ for calcination for 20min, and is cooled to 210 ℃ at 2 ℃/min after the calcination is finished.
The preparation method of the flaky boron nitride modifier in the embodiment comprises the following steps:
s1: adding chitosan and 3% of r-aminopropyl triethoxysilane according to the amount of 15% of the total amount of the acrylate emulsion, stirring until the mixture is fully mixed, then adding hydrochloric acid to adjust the pH of the solution to 5.5, then adding tetradecyl trimethyl ammonium bromide accounting for 0.35% of the total amount of the acrylate emulsion, and continuing to stir fully to obtain a modified liquid;
s2: performing cold-heat treatment on the flaky boron nitride, and obtaining the shaped flaky boron nitride after the treatment is finished;
s3: and (3) sending the shaped flaky boron nitride into a modifying liquid according to the weight ratio of 1:5 for ultrasonic treatment, wherein the ultrasonic power is 200W, the ultrasonic time is 50min, and the flaky boron nitride modifier is obtained after ultrasonic treatment, water washing and drying.
The cold-heat treatment method of the flaky boron nitride in the embodiment comprises the following steps: preheating at 50 ℃ for 15min, heating to 160 ℃ at the speed of 4.5 ℃/s, continuously preserving heat for 7.5min, air-cooling to room temperature, refrigerating at-5 ℃ for 4min, cooling, preserving at room temperature for standby, recovering to room temperature, and heating to 65 ℃ for standby.
The thickness of the flaky boron nitride in the embodiment is 1.25um, and the flaky diameter is 2.5um; the mullite fiber has a diameter of 4um and an aspect ratio of 20.
The modification method of the modified nano silicon dioxide in the embodiment comprises the following steps:
adding 20 parts of nano silicon dioxide into absolute ethyl alcohol according to a weight ratio of 1:3 for uniform dispersion, then adding 4 parts of ammonium dihydrogen phosphate aqueous solution with a molar concentration of 0.16mol/L and 2 parts of silane coupling agent KH560, then adding 2 parts of rare earth lanthanum chloride solution with a mass fraction of 2.5%, carrying out ultrasonic treatment for 30min with a power of 550W, ending ultrasonic treatment, washing with water, and drying to obtain the modified nano silicon dioxide.
The preparation method of the dustproof and easy-to-clean ceramic sheet comprises the following steps of:
sequentially adding cordierite, fluorite, potassium feldspar, a self-cleaning additive, a barium titanate sintering aid, talcum powder and modified nano silicon dioxide into a stirrer, mixing and stirring thoroughly, then sending into a ball mill for ball milling, passing through 200 meshes, and then pre-pressing at a pressing pressure of 4500 tons/m and a pressing thickness of 4.5mm;
step two, calcining and sintering treatment is carried out, the sintering temperature is 1365 ℃, sintering is carried out for 2.5 hours, and cooling to room temperature is carried out after sintering is finished;
and thirdly, spraying the easily cleaned material with the thickness of 2mm on the surface of the sintered material in the second step, drying for 25 minutes at 115 ℃, and obtaining the ceramic sheet.
The preparation method of the easy-to-clean material comprises the following steps: 15 parts of epoxy resin, 2 parts of graphene, 20 parts of acetone and 3.5 parts of polyethylene glycol are mixed according to parts by weight, and the mixture is fully mixed to obtain the easily cleaned material.
Comparative example 1.
Unlike example 3, the platy boron nitride in the self-cleaning additive was replaced with sericite.
Comparative example 2.
The difference from example 3 is that the mullite fiber in the self-cleaning additive is replaced with carbon fiber.
Comparative example 3.
The difference from example 3 is that sodium dodecyl sulfate is used instead of tetradecyl trimethyl ammonium bromide of the modifying liquid in the preparation of the flaky boron nitride modifier.
Comparative example 4.
The difference from example 3 is that the modified liquid was not added with r-aminopropyl triethoxysilane in the preparation of the flaky boron nitride modifier.
Comparative example 5.
The difference from example 3 is that no modified nanosilica was added.
Comparative example 6.
The difference from example 3 is that the nano silica is replaced by nano diatomite in the modification of the modified nano silica;
the modification method of the modified nano diatomite comprises the following steps:
adding 20 parts of nano diatomite into absolute ethyl alcohol according to a weight ratio of 1:3 for uniform dispersion, then adding 4 parts of ammonium dihydrogen phosphate aqueous solution with a molar concentration of 0.16mol/L and 2 parts of silane coupling agent KH560, then adding 2 parts of rare earth lanthanum chloride solution with a mass fraction of 2.5%, carrying out ultrasonic treatment for 30min with a power of 550W, ending ultrasonic treatment, washing with water, and drying to obtain the modified nano diatomite.
Comparative example 7.
The difference from example 3 is that the rare earth lanthanum chloride solution in the modification of the modified nano silicon dioxide is replaced by ferric chloride solution with the mass fraction of 2.5%.
Comparative example 8.
The difference from example 3 is that no easy-to-clean material spray treatment was used.
The sheets prepared in examples 1 to 3 and comparative examples 1 to 8 were coated with the dirt, dust, and sand in a weight ratio of 2:1:1, then left at 30 to 40 ℃ for 3 hours, then subjected to a wiping treatment, and the dirt was wiped clean by a test application of a wiping force, and the appearance surface layer breakage was inspected.
The products of examples 1-3 and comparative examples 1-8 were tested for performance as follows:
as can be seen from examples 1-3 and comparative examples 1-8, the wiping force in example 3 of the present invention is the smallest, which can reach 3.33N, and cleaning of stains can be achieved; the platy boron nitride in the self-cleaning additive is replaced by sericite, the mullite fiber in the self-cleaning additive is replaced by carbon fiber, the wiping force of the product is increased, and the self-cleaning additive is exclusive in selecting mullite fiber-platy boron nitride;
meanwhile, the modification of the flaky boron nitride modifier is unique, and the functional effect of the invention can not be achieved by adopting other methods for processing; in addition, the self-cleaning capability of the product can be effectively improved by adding the nano silicon dioxide, and the effect of the invention can not be realized by replacing the nano diatomite raw material;
the cleaning agent is not sprayed by the easy-to-clean material, so that the wiping force of the product is obviously improved, and the self-cleaning effect of the product can be obviously improved by combining the raw material proportion in the product and the easy-to-clean material.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. The dustproof easy-to-clean ceramic sheet is characterized by comprising the following raw materials in parts by weight:
20-30 parts of cordierite, 15-25 parts of fluorite, 5-10 parts of potassium feldspar, 3-6 parts of self-cleaning additive, 1-2 parts of barium titanate sintering aid, 0.2-0.6 part of talcum powder and 0.1-0.3 part of modified nano silicon dioxide;
the preparation method of the self-cleaning additive comprises the following steps:
s1: firstly, placing mullite fiber in a radiation field for radiation treatment, wherein the radiation adopts proton irradiation, the irradiation dose is 40-100kGy, and the irradiation is finished to obtain irradiation modified mullite fiber;
s2: feeding the irradiation modified mullite fiber into a 2-3 times flaky boron nitride modifier for stirring and dispersing, wherein the stirring speed is 500-600r/min, the stirring time is 45-55min, the stirring temperature is 75-85 ℃, and the stirring is finished, and the mullite-flaky boron nitride composite material is obtained after washing and drying;
s3: performing heat improvement treatment on the mullite-flaky boron nitride composite material, and finally air-cooling to room temperature to obtain a mullite-flaky boron nitride improved body;
s4: feeding the mullite-flaky boron nitride improved body into a grinder for grinding, wherein the grinding speed is 2000-2500r/min, the grinding time is 35-45min, and the self-cleaning additive is obtained after the grinding is finished;
the preparation method of the flaky boron nitride modifier comprises the following steps:
s1: adding chitosan and 1-5% of r-aminopropyl triethoxysilane according to the total amount of 10-20% of the acrylate emulsion, stirring until the mixture is fully mixed, then adding hydrochloric acid to adjust the pH of the solution to 5.0-6.0, then adding tetradecyl trimethyl ammonium bromide accounting for 0.2-0.5% of the total amount of the acrylate emulsion, and continuing to stir fully to obtain a modified liquid;
s2: performing cold-heat treatment on the flaky boron nitride, and obtaining the shaped flaky boron nitride after the treatment is finished;
s3: sending the shaped flaky boron nitride into a modifying liquid according to the weight ratio of 1:5 for ultrasonic treatment, wherein the ultrasonic power is 100-300W, the ultrasonic time is 45-55min, and the flaky boron nitride modifier is obtained after ultrasonic treatment, water washing and drying;
the modification method of the modified nano silicon dioxide comprises the following steps:
adding 15-25 parts of nano silicon dioxide into absolute ethyl alcohol according to a weight ratio of 1:3 for uniform dispersion, then adding 2-6 parts of ammonium dihydrogen phosphate aqueous solution with a molar concentration of 0.12-0.18mol/L and 1-3 parts of silane coupling agent KH560, then adding 1-3 parts of rare earth lanthanum chloride solution with a mass fraction of 1-4%, carrying out ultrasonic treatment for 25-35min at a power of 500-600W, ending ultrasonic treatment, washing with water and drying to obtain modified nano silicon dioxide;
the preparation method of the dustproof and easy-to-clean ceramic sheet comprises the following steps of:
sequentially adding cordierite, fluorite, potassium feldspar, self-cleaning additive, barium titanate sintering aid, talcum powder and modified nano silicon dioxide into a stirrer to be mixed and stirred fully, then sending into a ball mill to be ball-milled, passing through 200 meshes, and then pre-pressing at 4000-5000 tons/m 2 The pressing thickness is 3-6mm;
step two, calcining and sintering treatment is carried out, the sintering temperature is 1360-1370 ℃, sintering is carried out for 2-3 hours, and cooling to room temperature is finished;
step three, spraying the easily cleaned material with the thickness of 1-3mm on the surface of the sintered material in the step two, drying for 20-30min at the temperature of 110-120 ℃ and obtaining a ceramic sheet after the drying is finished;
the preparation method of the easy-to-clean material comprises the following steps: 10-20 parts of epoxy resin, 1-3 parts of graphene, 15-25 parts of acetone and 2-5 parts of polyethylene glycol are mixed according to parts by weight, and the mixture is fully mixed to obtain the easily-cleaned material.
2. The dustproof and easy-to-clean ceramic sheet according to claim 1, wherein the dustproof and easy-to-clean ceramic sheet comprises the following raw materials in parts by weight:
25 parts of cordierite, 20 parts of fluorite, 7.5 parts of potassium feldspar, 4.5 parts of self-cleaning additive, 1.5 parts of barium titanate sintering aid, 0.4 part of talcum powder and 0.2 part of modified nano silicon dioxide.
3. The dustproof and easy-to-clean ceramic sheet according to claim 1, wherein the specific operation steps of the heat improvement treatment are as follows: firstly, the mixture is sent to a temperature of 300-350 ℃ for calcination for 15-25min, and after the calcination is finished, the mixture is cooled to 200-220 ℃ at a speed of 1-3 ℃/min.
4. The dustproof and easy-to-clean ceramic sheet according to claim 1, wherein the sheet-shaped boron nitride cold-heat treatment method comprises the following steps: preheating at 45-65deg.C for 10-20min, heating to 150-170deg.C at a rate of 4-5deg.C/s, keeping the temperature for 5-10min, air cooling to room temperature, refrigerating at-5deg.C for 2-6min, cooling, storing at room temperature for use, recovering to room temperature, and heating to 60-70deg.C for use.
5. The dustproof and easy-to-clean ceramic sheet according to claim 4, wherein the thickness of the flaky boron nitride is 1-1.5um, and the flaky diameter is 2-3um; the diameter of the mullite fiber is 2-6um, and the length-diameter ratio is 10-30.
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