CN113773109A - Efficient metal reflection type heat insulation material - Google Patents
Efficient metal reflection type heat insulation material Download PDFInfo
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- CN113773109A CN113773109A CN202110988743.4A CN202110988743A CN113773109A CN 113773109 A CN113773109 A CN 113773109A CN 202110988743 A CN202110988743 A CN 202110988743A CN 113773109 A CN113773109 A CN 113773109A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 21
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- 238000000576 coating method Methods 0.000 claims abstract description 61
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- -1 azo compound Chemical class 0.000 claims description 3
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- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- LLZRNZOLAXHGLL-UHFFFAOYSA-J titanic acid Chemical compound O[Ti](O)(O)O LLZRNZOLAXHGLL-UHFFFAOYSA-J 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
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- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 2
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 2
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 2
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- 150000001340 alkali metals Chemical class 0.000 claims description 2
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 2
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- YXRKNIZYMIXSAD-UHFFFAOYSA-N 1,6-diisocyanatohexane Chemical compound O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O.O=C=NCCCCCCN=C=O YXRKNIZYMIXSAD-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/04—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/06—Acrylates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00525—Coating or impregnation materials for metallic surfaces
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a high-efficiency metal reflection type heat insulation material which comprises a plurality of layers of stainless steel foils arranged in parallel, wherein each stainless steel foil is provided with a concave-convex structure, the concave-convex structures of two adjacent stainless steel foils are arranged in a staggered mode, at least one surface of each stainless steel foil is provided with a high-reflection porous coating, each high-reflection porous coating is provided with an open pore structure extending from the inside of each coating to the surface of each coating, and the heat reflectivity of each high-reflection porous coating is more than or equal to 0.9. According to the heat diffusion principle, the porous structure of the high-reflection coating on the surface of the stainless steel foil is designed, so that heat can be effectively prevented from being transmitted from gaps among the stainless steel foils. The high-reflection porous coating can effectively reflect heat radiation, the heat reflectivity of the high-reflection porous coating is more than or equal to 0.9, and the effects of heat insulation and heat preservation can be achieved.
Description
Technical Field
The invention relates to the technical field of nuclear power heat preservation, in particular to a high-efficiency metal reflection type heat preservation material.
Background
The nuclear power station generates electricity by using heat released by nuclear fission reaction, and a large amount of heat energy is stored in a pipeline for the nuclear power station. In order to reduce heat loss and reduce the working environment temperature in the nuclear island, a heat preservation device or a heat preservation structure needs to be installed outside the nuclear pipeline. At present, the heat-insulating layer of the main equipment of the third-generation nuclear power station which is independently developed and designed in China is completely made of a metal heat-insulating layer.
The inventor discloses in patent No. CN212455977U, a heat preservation device for nuclear pipeline, which is characterized in that: comprises at least two heat preservation blocks which are in one-to-one correspondence in shape and size and are spliced to be coated on the outer wall of the nuclear pipeline; each heat-insulating block comprises an inner plate, an outer plate, a two-axial baffle and two radial baffles, wherein the two-axial baffle and the two-radial baffle are fixedly packaged between the inner plate and the outer plate; and a metal reflection type heat insulation structure capable of reducing heat conduction is filled between the inner plate, the outer plate, the two axial baffles and the two radial baffles.
This heat preservation device for nuclear pipeline, long service life, dismouting are convenient and the heat preservation effect is good. As the inventor further researches, the following results are found: the metal reflection type heat preservation structure is composed of stainless steel foils, the effect of reflecting heat radiation is not good, the heat insulation performance is common due to the metal material, and most importantly, the multi-layer stainless steel foils can prevent heat from diffusing along the transverse direction to a certain degree, but can not prevent the heat from diffusing from gaps among the stainless steel foils.
Disclosure of Invention
The present invention aims to provide a high efficiency metal reflective insulation material that solves one or more of the above mentioned problems of the prior art.
The invention provides a high-efficiency metal reflection type heat insulation material which comprises a plurality of layers of stainless steel foils arranged in parallel, wherein each stainless steel foil is provided with a concave-convex structure, the concave-convex structures of two adjacent stainless steel foils are arranged in a staggered mode, at least one surface of each stainless steel foil is provided with a high-reflection porous coating, each high-reflection porous coating is provided with an open pore structure extending from the inside of each coating to the surface of each coating, and the heat reflectivity of each high-reflection porous coating is more than or equal to 0.9.
In some embodiments, the highly reflective porous coating has a thickness of 20 to 45 μm.
In some embodiments, the volume of the open cell structure is 5% to 90% of the volume of the coating, the depth of the open cell structure is in the range of 1% to 100% of the thickness of the coating, and the open cell depths are the same or different.
In some embodiments, the highly reflective porous coating is prepared by:
adding hydroxyl acrylic resin, organic solvent and auxiliary agent into a reaction tank, uniformly stirring, and then adding heat reflection pigment and porous SiO2Particles and a foaming agent are evenly stirred to prepare a component A;
adding an organic solvent into a reaction tank, then adding polyisocyanate, and uniformly stirring to obtain a component B;
and mixing and stirring the component A and the component B according to the mass part ratio of 10: 3-10: 1, coating the mixture on the surface of the stainless steel foil, and drying the stainless steel foil at 100-350 ℃ to decompose a foaming agent in the coating to generate volatile gas.
In some embodiments, the weight average molecular weight of the hydroxy acrylic resin is 4000-5000, the solid content is 55-60 wt%, the hydroxyl content is 2.3-2.6 wt%, the organic solvent is one or more of xylene, cyclohexanone, butanone, methyl isobutyl ketone or ethyl acetate, the auxiliary agent is one or more of a wetting dispersant, an antifoaming agent, a leveling agent, an anti-settling agent or an anti-sagging agent, the heat-emitting pigment is titanium dioxide, the foaming agent is one or more of carbonate, nitrite, alkali metal borohydride, azo compound foaming agent, nitroso compound foaming agent or hydrazide foaming agent, and the polyisocyanate is one or more of HDI biuret, HDI trimer or IPDI trimer curing agent.
In some embodiments, the porous SiO2The Cl ion content in the particles is less than 50PPM, SO4 2-The ion content is less than 50 PPM.
In some embodiments, the porous SiO2The granules are prepared by the following steps:
carrying out ion exchange on sodium silicate to obtain first silicic acid with the pH value of 2-3; passing the first silicic acid through anion exchange resin to obtain second silicic acid with pH of 5-6; passing the second silicic acid through cation exchange resin to obtain third silicic acid with pH of 3-4; adding the third silicic acid into a reaction kettle, simultaneously adding KOH solution, and heating at 100-120 ℃ for 40-60h to obtain SiO with the solid content of 40-45%2Solution of the SiO2Drying and grinding the solution to obtain the porous SiO2And (3) granules.
In some embodiments, the titanium dioxide is a high crystallinity rutile titanium oxide.
In some embodiments, the titanium dioxide is prepared by:
adding TiO into the mixture2·nH2Adding a proper amount of water into the mixture, uniformly grinding the mixture in a mortar, then sintering the mixture in a muffle furnace to 880 ℃, preserving the heat for 2 hours, and slowly cooling the mixture to room temperature to obtain an intermediate product K, wherein the molar ratio of O to KOH is 0.56Ti2O7；
Putting the dispersed intermediate product into a small amount of water for hydration for 7 days, then putting the hydration product into a proper amount of water for strong magnetic stirring, continuously dropwise adding 0.5M hydrochloric acid, and controlling the pH value of the solution to be 2.0 by using an acidimeter;
the intermediate product is pumped and filtered, washed to neutrality by water and dried to constant weight to obtain the product titanic acid, which is respectively put in a muffle furnace at 10 ℃ for min-1Sintering to 1000-1200 deg.C, keeping the temperature for 2h, and slowly cooling to room temperature to obtain gold with high crystallization degreeAndalusite-type titanium oxide.
In some embodiments, the stainless steel foil is 1Cr13 stainless steel, and the 1Cr13 stainless steel includes 0.10% to 0.15% of C element, 0.50% to 0.75% of Mn element, 0.015% or less of P element, 0.010% or less of S element, 0.40% to 0.50% of Ni element, < 0.005% of O element, 0.25% to 0.50% of Si element, 12% to 13% of Cr element, 0.0020% or less of B element, 0.05% or less of Co element, < 0.015% of B element, < 0.20% of Cu element, and the balance of Fe element.
The invention has the beneficial effects that:
according to the heat diffusion principle, the porous structure of the high-reflection coating on the surface of the stainless steel foil is designed, so that heat can be effectively prevented from being transmitted from gaps among the stainless steel foils.
The high-reflection porous coating can effectively reflect heat radiation, the heat reflectivity of the high-reflection porous coating is more than or equal to 0.9, and the effects of heat insulation and heat preservation can be achieved. Wherein, the titanium pigment is rutile titanium oxide with high crystallinity, and has high reflectivity to infrared spectrum region, i.e. light with wavelength more than 0.76 μm, so that the heat reflection effect of the coating can be obviously improved; selected porous SiO2The coating has the characteristics of light particle weight, small particle size, low thermal conductivity coefficient, capability of effectively filling pores among particles, reduction of the porosity of a paint film and reduction of the black body absorption effect of the pores as far as possible, thereby effectively improving the emissivity and the reflectivity of the coating, and enabling the coating to have the characteristics of small density, high volume solid content and good heat insulation effect; therefore, the thickness of the high-reflection porous coating is 20-45 mu m, the heat reflection heat insulation effect of the whole coating can be obviously improved, and the service life is long.
And because the coating is used in the nuclear power field, the coating cannot contain Cl-、SO4 2-Easily corrosive ions, porous SiO selected in the coating2The particles are prepared by three times of ion exchange, and do not contain Cl after third-party detection-And SO4 2-。
Because the stainless steel foil is specially used in the nuclear power field, the chemical components of the stainless steel material are selected for the stainless steel foil, the requirements on the existing C, Si, Mn, Cr, S and P of the common 1Cr13 are strictly limited, the requirements on the component ranges of Ni, B, Co, N and O are increased, the content of elements such As Pb, Sn, Sb, Bi, As, Ce, La and Mo is required to be As low As possible (each content is less than or equal to 0.005%), and actual measurement data are provided. By strictly controlling the chemical components, the ferrite content of the processed stainless steel foil is ensured to be less than 10%, the strength and the hardness are improved, and the impact toughness is not reduced.
Drawings
FIG. 1 is a schematic structural view of a high-reflective porous coating layer of a high-efficiency metal reflective insulation material prepared according to an embodiment;
fig. 2 is a schematic structural view of a high-reflection porous coating layer of the high-efficiency metal reflection type thermal insulation material prepared in one embodiment.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are only for illustrating the performance of the present invention more clearly and are not limited to the following examples.
Example (b):
porous SiO2The granules are prepared by the following steps:
carrying out ion exchange on sodium silicate to obtain first silicic acid with the pH value of 2-3; passing the first silicic acid through anion exchange resin to obtain second silicic acid with pH of 5-6; passing the second silicic acid through cation exchange resin to obtain third silicic acid with pH of 3-4; adding the third silicic acid into a reaction kettle, simultaneously adding KOH solution, and heating at 120 ℃ for 40h to obtain SiO with the solid content of 45%2Solution of the SiO2Drying and grinding the solution to obtain the porous SiO2And (3) granules.
The titanium dioxide is prepared by the following steps:
adding TiO into the mixture2·nH2Adding a proper amount of water into the mixture, uniformly grinding the mixture in a mortar, then sintering the mixture in a muffle furnace to 880 ℃, preserving the heat for 2 hours, and slowly cooling the mixture to room temperature to obtain an intermediate product K, wherein the molar ratio of O to KOH is 0.56Ti2O7；
Putting the dispersed intermediate product into a small amount of water for hydration for 7 days, then putting the hydration product into a proper amount of water for strong magnetic stirring, continuously dropwise adding 0.5M hydrochloric acid, and controlling the pH value of the solution to be 2.0 by using an acidimeter;
the intermediate product is pumped and filtered, washed to neutrality by water and dried to constant weight to obtain the product titanic acid, which is respectively put in a muffle furnace at 10 ℃ for min-1Sintering to 1200 ℃, keeping the temperature for 2h, and slowly cooling to room temperature to obtain the rutile titanium oxide with high crystallization degree.
Adding 40Kg of S1196 hydroxy acrylic resin from Nuplex company, 12Kg of butanone, 4Kg of dispersant BYK 163 from BYK company in Germany and anti-sagging agent PLUS from Hamins company in a reaction tank by weight parts, stirring uniformly, then adding 40Kg of rutile type titanium oxide with high crystallinity, 6Kg of porous SiO2The particles and 6Kg of azo compound foaming agent are evenly stirred to prepare a component A;
adding 15Kg of butanone into a reaction tank, then adding 75Kg of HDI biuret, and uniformly stirring to obtain a component B;
and mixing and stirring the component A and the component B according to the mass ratio of 10: 3, coating the mixture on the surface of a stainless steel foil, and drying the stainless steel foil at 200 ℃ to decompose a foaming agent in the coating to generate volatile gas.
The resulting highly reflective porous coating is shown in fig. 1 and 2, where the stainless steel foil is 10, the coating is 20, and the open cell structure is 30:
the volume of the open pore structure accounts for 40% of the volume of the coating, the depth range of the open pore structure is 75% of the thickness of the coating, the open pore depths are different, and the longitudinal shape of the open pore is regular or irregular.
The highly reflective porous coating on the stainless steel foil of the examples was tested:
the salt spray resistance test is carried out according to GB/T1763;
the artificial weathering resistance test is carried out according to appendix A of ISO 20340-;
the solar heat reflectivity is tested according to GB/T25261-;
the hemispherical emissivity is tested according to GB/T2680-;
the thermal conductivity was measured as GJB 1201.1-91.
The results are shown in the following table:
according to the heat diffusion principle, the porous structure of the high-reflection coating on the surface of the stainless steel foil is designed, so that heat can be effectively prevented from being transmitted from gaps among the stainless steel foils.
The high-reflection porous coating can effectively reflect heat radiation, the heat reflectivity of the high-reflection porous coating is more than or equal to 0.9, and the effects of heat insulation and heat preservation can be achieved. Wherein, the titanium pigment is rutile titanium oxide with high crystallinity, and has high reflectivity to infrared spectrum region, i.e. light with wavelength more than 0.76 μm, so that the heat reflection effect of the coating can be obviously improved; selected porous SiO2The coating has the characteristics of light particle weight, small particle size, low thermal conductivity coefficient, capability of effectively filling pores among particles, reduction of the porosity of a paint film and reduction of the black body absorption effect of the pores as far as possible, thereby effectively improving the emissivity and the reflectivity of the coating, and enabling the coating to have the characteristics of small density, high volume solid content and good heat insulation effect; therefore, the thickness of the high-reflection porous coating is 20-45 mu m, the heat reflection heat insulation effect of the whole coating can be obviously improved, and the service life is long.
And because the coating is used in the nuclear power field, the coating cannot contain Cl-、SO4 2-Easily corrosive ions, porous SiO selected in the coating2The particles are prepared by three times of ion exchange, and do not contain Cl after third-party detection-And SO4 2-。
Because the stainless steel foil is specially used in the nuclear power field, the chemical components of the stainless steel material are selected for the stainless steel foil, the requirements on the existing C, Si, Mn, Cr, S and P of the common 1Cr13 are strictly limited, the requirements on the component ranges of Ni, B, Co, N and O are increased, the content of elements such As Pb, Sn, Sb, Bi, As, Ce, La and Mo is required to be As low As possible (each content is less than or equal to 0.005%), and actual measurement data are provided. By strictly controlling the chemical components, the ferrite content of the processed stainless steel foil is ensured to be less than 10%, the strength and the hardness are improved, and the impact toughness is not reduced.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these should also be construed as being within the scope of the present invention.
Claims (10)
1. The efficient metal reflection type heat insulation material is characterized by comprising a plurality of layers of stainless steel foils arranged in parallel, wherein each stainless steel foil is provided with a concave-convex structure, the concave-convex structures of two adjacent stainless steel foils are arranged in a staggered mode, at least one surface of each stainless steel foil is provided with a high-reflection porous coating, each high-reflection porous coating is provided with an open pore structure extending from the inside of each coating to the surface of each coating, and the heat reflectivity of each high-reflection porous coating is larger than or equal to 0.9.
2. The efficient metal reflective insulation of claim 1, wherein said highly reflective porous coating has a thickness of 20-45 μm.
3. The efficient metal reflective insulation material of claim 1, wherein the volume of the open pore structure is 5-90% of the volume of the coating, the depth of the open pore structure is 1-100% of the thickness of the coating, and the open pore depths are the same or different.
4. The efficient metal reflective insulation material of claim 1, wherein the highly reflective porous coating is prepared by the following steps:
according to the mass portion, 30-50 portions of hydroxyl acrylic resin, 10-15 portions of organic solvent and 2-6 portions of auxiliary agent are added into a reaction tank, evenly stirred, and then 35-45 portions of heat reflection pigment and 4-8 portions of porous SiO are added2Uniformly stirring the particles and 2-8 parts of foaming agent to obtain a component A;
adding 10-25 parts of organic solvent into a reaction tank, then adding 75-80 parts of polyisocyanate, and uniformly stirring to obtain a component B;
mixing the component A and the component B according to a mass part ratio of 10: 3-10: 1, coating on the surface of stainless steel foil, drying at 100-350 deg.C to decompose foaming agent in the coating and generate volatile gas.
5. The efficient metal reflective insulation material according to claim 4, the weight-average molecular weight of the hydroxyl acrylic resin is 4000-5000, the solid content is 55-60 wt%, the hydroxyl content is 2.3-2.6 wt%, the organic solvent is one or more of dimethylbenzene, cyclohexanone, butanone, methyl isobutyl ketone or ethyl acetate, the auxiliary agent is one or more of wetting dispersant, defoamer, flatting agent, anti-settling agent or anti-sagging agent, the thermal emission pigment is titanium dioxide, the foaming agent is one or more of carbonate, nitrite, borohydride of alkali metal, azo compound foaming agent, nitroso compound foaming agent or hydrazide foaming agent, the polyisocyanate is one or more of HDI biuret, HDI tripolymer or IPDI tripolymer curing agent.
6. The efficient metal reflective insulation material of claim 4, wherein said porous SiO2The Cl ion content in the particles is less than 50PPM, SO4 2-The ion content is less than 50 PPM.
7. The efficient metal reflective insulation material of claim 6, wherein said porous SiO2The granules are prepared by the following steps:
carrying out ion exchange on sodium silicate to obtain first silicic acid with the pH value of 2-3; passing the first silicic acid through anion exchange resin to obtain second silicic acid with pH of 5-6; passing the second silicic acid through cation exchange resin to obtain third silicic acid with pH of 3-4; adding the third silicic acid into a reaction kettle, simultaneously adding KOH solution, and heating at 100-120 ℃ for 40-60h to obtain SiO with the solid content of 40-45%2Solution of the SiO2Drying the solutionThe porous SiO is obtained after drying and grinding2And (3) granules.
8. The efficient metal reflective insulation material of claim 4, wherein the titanium dioxide is rutile titanium oxide with high crystallinity.
9. The efficient metal reflection type thermal insulation material as claimed in claim 8, wherein the titanium dioxide is prepared by the following steps:
adding TiO into the mixture2·nH2Adding a proper amount of water into the mixture, uniformly grinding the mixture in a mortar, then sintering the mixture in a muffle furnace to 880 ℃, preserving the heat for 2 hours, and slowly cooling the mixture to room temperature to obtain an intermediate product K, wherein the molar ratio of O to KOH is 0.56Ti2O7；
Putting the dispersed intermediate product into a small amount of water for hydration for 7 days, then putting the hydration product into a proper amount of water for strong magnetic stirring, continuously dropwise adding 0.5M hydrochloric acid, and controlling the pH value of the solution to be 2.0 by using an acidimeter;
the intermediate product is pumped and filtered, washed to neutrality by water and dried to constant weight to obtain the product titanic acid, which is respectively put in a muffle furnace at 10 ℃ for min-1Sintering to 1000-1200 deg.c, maintaining for 2 hr, and cooling to room temperature to obtain rutile-type titanium oxide with high crystallization degree.
10. The efficient metal reflective thermal insulation material of claim 1, wherein the stainless steel foil is 1Cr13 stainless steel, and the 1Cr13 stainless steel comprises 0.10-0.15% of C element, 0.50-0.75% of Mn element, less than or equal to 0.015% of P element, less than or equal to 0.010% of S element, 0.40-0.50% of Ni element, less than 0.005% of O element, 0.25-0.50% of Si element, 12-13% of Cr element, less than or equal to 0.0020% of B element, less than or equal to 0.05% of Co element, less than 0.015% of B element, less than 0.20% of Cu element, and the balance of Fe element.
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