CN114105193A - Preparation method of ultraviolet shielding nano titanium dioxide material - Google Patents
Preparation method of ultraviolet shielding nano titanium dioxide material Download PDFInfo
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- CN114105193A CN114105193A CN202111445299.8A CN202111445299A CN114105193A CN 114105193 A CN114105193 A CN 114105193A CN 202111445299 A CN202111445299 A CN 202111445299A CN 114105193 A CN114105193 A CN 114105193A
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- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000000463 material Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 28
- 239000006185 dispersion Substances 0.000 claims abstract description 22
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000002243 precursor Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000011268 mixed slurry Substances 0.000 claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 8
- 239000003513 alkali Substances 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- DCKVFVYPWDKYDN-UHFFFAOYSA-L oxygen(2-);titanium(4+);sulfate Chemical compound [O-2].[Ti+4].[O-]S([O-])(=O)=O DCKVFVYPWDKYDN-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910000348 titanium sulfate Inorganic materials 0.000 claims abstract description 8
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 8
- 239000006228 supernatant Substances 0.000 claims abstract description 6
- 238000007865 diluting Methods 0.000 claims abstract description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 12
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 3
- 235000011054 acetic acid Nutrition 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 229910017604 nitric acid Inorganic materials 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 abstract description 47
- 230000000694 effects Effects 0.000 abstract description 14
- 239000002086 nanomaterial Substances 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000002834 transmittance Methods 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000000475 sunscreen effect Effects 0.000 description 2
- 239000000516 sunscreening agent Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000005337 ground glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
- C01G23/0532—Producing by wet processes, e.g. hydrolysing titanium salts by hydrolysing sulfate-containing salts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/08—Drying; Calcining ; After treatment of titanium oxide
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/22—Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
- C03C17/23—Oxides
- C03C17/25—Oxides by deposition from the liquid phase
- C03C17/256—Coating containing TiO2
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/70—Properties of coatings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
- C03C2218/112—Deposition methods from solutions or suspensions by spraying
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- Chemical & Material Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention belongs to the technical field of nano materials, and particularly discloses a preparation method of an ultraviolet shielding nano titanium dioxide material, which comprises the following steps: (1) mixing titanium sulfate and alkali liquor to obtain mixed slurry; (2) after the mixed slurry is completely precipitated, removing supernatant to obtain a titanium dioxide precursor; (3) after the titanium dioxide precursor is subjected to ultrasonic dispersion, adding hydrogen peroxide for mixing to obtain nano titanium dioxide sol; (4) adding acid liquor into the titanium dioxide sol to obtain acidified nano titanium dioxide dispersion liquid; (5) and diluting the acidified nano titanium dioxide dispersion liquid by 100 times to obtain the acidified nano titanium dioxide material. Compared with the prior art, the nano titanium dioxide material prepared by the method is applied to glass, so that the glass has a better ultraviolet shielding effect.
Description
Technical Field
The invention belongs to the technical field of nano materials, and particularly discloses a preparation method of an ultraviolet shielding nano titanium dioxide material.
Background
The vacuum glass is the most advanced energy-saving glass in the internationally recognized building field, is widely adopted by passive buildings by virtue of the outstanding energy-saving effect and product advantages, and becomes the preferred scheme of the world advanced energy-saving green buildings. The vacuum glass is generally of a sandwich structure consisting of a piece of Low-e glass, a piece of white glass and a vacuum layer, and compared with the existing hollow glass, the vacuum glass has higher heat insulation and sound insulation effects and can realize more efficient energy conservation and emission reduction.
For the vacuum glass for buildings, on the premise of ensuring a certain light transmittance, the glass is also expected to have more ultraviolet shielding rate, particularly for glass for curtain walls and glass for sunlight rooms. However, the current Low-e glass has no high ultraviolet shielding efficiency whether single silver, double silver or triple silver. If 2 pieces of three-silver Low-e glass are used to form the vacuum glass, not only the extremely Low visible light transmittance is caused, but also the cost of the product is greatly increased.
Titanium dioxide is a well-recognized and safe inorganic ultraviolet screening agent, and therefore is allowed to be used as an additive in a sunscreen product for skin care, and the screening effect of the titanium dioxide on ultraviolet light in the sunscreen product is mostly derived from the scattering effect of the titanium dioxide on the ultraviolet light. Titanium dioxide having a light scattering effect generally has a relatively large particle size, and when it is used for glass, the light scattering effect greatly lowers the transparency of the glass, so that the glass is in a ground glass state. Therefore, nano-titanium dioxide with small particle size is generally used as a coating agent on the surface of glass, and the nano-titanium dioxide is widely used as a self-cleaning coating on the surface of glass without influencing the transmission of visible light. However, due to the weak ultraviolet light absorption rate and photocatalytic efficiency of nano titanium dioxide, the prepared glass has a poor ultraviolet light shielding effect in practical application, and the requirement of ultraviolet light shielding at present is difficult to meet.
Disclosure of Invention
The invention aims to provide a preparation method of an ultraviolet shielding nano titanium dioxide material, which aims to solve the problem that the ultraviolet shielding effect of the used nano titanium dioxide coating applied to glass is poor.
In order to achieve the purpose, the basic scheme of the invention is as follows: a preparation method of an ultraviolet shielding nano titanium dioxide material comprises the following steps: (1) mixing titanium sulfate and alkali liquor to obtain mixed slurry; (2) after the mixed slurry is completely precipitated, removing supernatant to obtain a titanium dioxide precursor; (3) after the titanium dioxide precursor is subjected to ultrasonic dispersion, adding hydrogen peroxide for mixing to obtain nano titanium dioxide sol; (4) adding acid liquor into the titanium dioxide sol to obtain acidified nano titanium dioxide dispersion liquid; (5) and diluting the acidified nano titanium dioxide dispersion liquid by 100 times to obtain the acidified nano titanium dioxide material.
The working principle of the basic scheme is as follows: the acidified nanometer titanium dioxide material obtained by the method can be sprayed on the surface of glass by an atomizing spray gun, and a glass coating formed by the nanometer titanium dioxide glass material can well absorb ultraviolet rays, so that most of ultraviolet rays are isolated, and the glass has a good ultraviolet ray shielding effect. Meanwhile, because the particles are small and the dispersity is good, the coating formed on the surface of the glass has good transparency, so that the formed coating does not influence visible light.
The beneficial effect of this basic scheme lies in:
1. in the acidified nanometer titanium dioxide material obtained by the method, the in-situ dispersed particle size of the titanium dioxide is only 2-5nm as seen by TEM, and the dispersed particle size test result shows that the titanium dioxide is in a highly dispersed state, has excellent stability and is beneficial to uniformly covering the surface of glass after spraying.
2. After the treatment of acid liquor, the absorptivity of the nano titanium dioxide to ultraviolet light is improved, and the nano titanium dioxide can shield the ultraviolet light after being sprayed on the surface of glass.
Compared with the prior art, the nano titanium dioxide material prepared by the method is applied to glass, so that the glass has a better ultraviolet shielding effect.
Further, the molar ratio of the Ti contained in the titanium sulfate and the alkali liquor and the OH contained in the alkali liquor in the step (1) is 1: 1.5-2.5.
Has the advantages that: the obtained mixed slurry can be more convenient to complete the subsequent preparation steps.
Further, the alkali liquor in the step (1) is one or a mixture of ammonia water, sodium hydroxide and potassium hydroxide.
Has the advantages that: the ammonia water, the sodium hydroxide and the potassium hydroxide are easy to obtain and have low cost.
Further, the mass ratio of the titanium dioxide precursor to the hydrogen peroxide in the step (3) is 1: 1-3, wherein the power of ultrasonic dispersion in the step (3) is 400w, and the time is 30 minutes.
Has the advantages that: nano titanium dioxide sol can be quickly obtained; the ultrasonic dispersion effect is better.
Further, after the acid solution is added in the step (4), the pH value of the acidified nano titanium dioxide dispersion solution is 0.8-2.
Has the advantages that: so that the finally obtained acidified nanometer titanium dioxide material has less corrosiveness to metals.
Further, the acid solution in the step (4) is one or a mixture of hydrochloric acid, nitric acid, oxalic acid, formic acid and acetic acid.
Has the advantages that: hydrochloric acid, nitric acid, oxalic acid, formic acid and acetic acid are easy to obtain and low in cost.
Further, in the step (1), 1mol/L titanium sulfate solution and 2mol/L potassium hydroxide solution are mixed in equal volume, and the obtained mixed slurry is milky white suspension.
Has the advantages that: the preparation operation is smoother in this way.
Further, completely precipitating white fixed objects in the mixed slurry in the step (2), and removing supernatant liquid through filtration treatment to obtain the titanium dioxide precursor.
Has the advantages that: the titanium dioxide precursor with less impurity content can be obtained more easily.
Further, in the step (3), the titanium dioxide precursor and the hydrogen peroxide are mixed according to the mass ratio of 1:2.5 to obtain the nano titanium dioxide sol with the mass fraction of 1%.
Has the advantages that: the obtained nano titanium dioxide sol has better properties.
Further, in the step (4), oxalic acid is dripped into the nano titanium dioxide sol to obtain acidified nano titanium dioxide dispersion liquid, the pH value of the acidified nano titanium dioxide dispersion liquid reaches 1, and the acidified nano titanium dioxide dispersion liquid is aged for 3 hours to obtain orange red acidified nano titanium dioxide dispersion liquid.
Has the advantages that: the obtained acidified nano titanium dioxide has better ultraviolet ray dispersing and shielding effects.
Drawings
FIG. 1 is a transmission electron microscope image of acidified nanometer titania prepared in example 1 of the present invention;
FIG. 2 is a transmission electron microscope image of a conventional nano-titania prepared in example 2 of the present invention.
Detailed Description
Example 1
A preparation method of an ultraviolet shielding nano titanium dioxide material comprises the following steps:
(1) mixing 1mol/L titanium sulfate solution and 2mol/L potassium hydroxide solution in equal volume to obtain mixed slurry, wherein the mixed slurry is milky white suspension;
(2) after the white solid in the suspension is completely precipitated, removing the supernatant to obtain a titanium dioxide precursor;
(3) carrying out ultrasonic dispersion on the titanium dioxide precursor, wherein the power of the ultrasonic dispersion is 400w, and the time is 30 minutes; then mixing the sol with hydrogen peroxide according to the mass ratio of 1:2.5 to obtain 1% of nano titanium dioxide sol;
(4) dripping oxalic acid into the nano titanium dioxide sol to obtain acidified nano titanium dioxide dispersion liquid, so that the pH value of the acidified nano titanium dioxide dispersion liquid reaches 1; aging the acidified nano titanium dioxide dispersion liquid for 3 hours to obtain an orange-red acidified nano titanium dioxide dispersion liquid;
(5) the orange red acidified nano titanium dioxide sol is diluted by 100 times to obtain an acidified nano titanium dioxide material, and the acidified nano titanium dioxide material is sprayed on glass to be used as an ultraviolet shielding coating agent.
The acidified nano titanium dioxide material obtained in the embodiment 1 has stability, and can be stored at room temperature for more than 1 year without precipitation of the dispersion liquid. The acidified nano titania material obtained in this example 1 was characterized and observed by a transmission electron microscope, and the result is shown in fig. 1, and it can be seen from fig. 1 that the particle size of the acidified nano titania material is less than 5nm, and the acidified nano titania material is in a highly dispersed state.
Example 2
The difference between this example and example 1 is that the nano titania sol of step (3) is not acidified.
The nano titanium dioxide material obtained in this example is characterized and observed by a transmission electron microscope, and the result is shown in fig. 2, and it can be seen from fig. 2 that the nano titanium dioxide material prepared in this example has a particle size of more than 20 nm.
The acidified nano titania material prepared in example 1, the nano titania material prepared in example 2, a conventional ultra-dispersed titania dispersion, and H2The optical transmittance was measured to obtain the following table 1.
TABLE 1 optical transmittance contrast table
As can be seen from table 1, the ultraviolet light shielding rate of the acidified nano titania material prepared in example 1 is 87%, which is the same as that of the nano titania material without the acidification treatment in example 2, whereas the ultraviolet light shielding rate of the conventional ultra-dispersed nano titania sol is 45%. In addition, the pH (3.5) of the acidified nano titania material prepared in example 1 was also much lower than the commercial nano titania material (1.5), making it less corrosive to metals.
Optical transmittance measurements were performed on existing Low-e glass, existing vacuum glass made of a Low-e glass and a white glass, vacuum glass coated with conventional nano-titania, and vacuum glass coated with the acidified nano-titania glass material prepared in example 1, to obtain table 2, shown below.
TABLE 2 comparison table of optical transmittances of different kinds of coated glass
Table 2 shows that the ultraviolet shielding rate of the vacuum glass composed of a Low-e glass and a white glass is 55.6%, and the ultraviolet shielding rate of the vacuum glass sprayed with the conventional nano titanium dioxide is 85.4%, which indicates that the ultraviolet shielding rate of the vacuum glass is greatly improved after the nano titanium dioxide coating agent is used; however, in order to realize the transmission of 0 ultraviolet light, the ultraviolet light shielding rate of the vacuum glass coated with the acidified nano titanium dioxide material prepared in example 1 is 100%, and the transmission of 0 ultraviolet light is realized.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A preparation method of an ultraviolet shielding nano titanium dioxide material is characterized by comprising the following steps: the method comprises the following steps:
(1) mixing titanium sulfate and alkali liquor to obtain mixed slurry;
(2) after the mixed slurry is completely precipitated, removing supernatant to obtain a titanium dioxide precursor;
(3) after the titanium dioxide precursor is subjected to ultrasonic dispersion, adding hydrogen peroxide for mixing to obtain nano titanium dioxide sol;
(4) adding acid liquor into the titanium dioxide sol to obtain acidified nano titanium dioxide dispersion liquid;
(5) and diluting the acidified nano titanium dioxide dispersion liquid by 100 times to obtain the acidified nano titanium dioxide material.
2. The method for preparing the ultraviolet shielding nano titanium dioxide material according to claim 1, wherein the molar ratio of the titanium sulfate to the Ti and the OH contained in the alkali liquor in the step (1) is 1: 1.5-2.5.
3. The method for preparing the ultraviolet shielding nano titanium dioxide material according to claim 2, wherein the alkali solution in the step (1) is one of ammonia water, sodium hydroxide and potassium hydroxide.
4. The method for preparing the ultraviolet shielding nano titanium dioxide material according to claim 3, wherein the mass ratio of the titanium dioxide precursor to the hydrogen peroxide in the step (3) is 1: 1-3, wherein the power of ultrasonic dispersion in the step (3) is 400w, and the time is 30 minutes.
5. The method for preparing ultraviolet shielding nano titanium dioxide material according to claim 4, wherein the pH value of the acidified nano titanium dioxide dispersion solution is 0.8-2 after the acid solution is added in the step (4).
6. The method for preparing the ultraviolet shielding nano titanium dioxide material according to claim 5, wherein the acid solution in the step (4) is one of hydrochloric acid, nitric acid, oxalic acid, formic acid and acetic acid.
7. The method for preparing the ultraviolet shielding nano titanium dioxide material according to any one of claims 1 to 6, wherein 1mol/L titanium sulfate solution and 2mol/L potassium hydroxide solution are mixed in equal volume in the step (1), and the obtained mixed slurry is a milky white suspension.
8. The method for preparing ultraviolet shielding nano titanium dioxide material according to claim 7, wherein white fixed matters in the mixed slurry are completely precipitated in the step (2), and the supernatant is removed through a filtering treatment to obtain the titanium dioxide precursor.
9. The method for preparing the ultraviolet shielding nano titanium dioxide material according to claim 8, wherein in the step (3), the titanium dioxide precursor and the hydrogen peroxide are mixed according to a mass ratio of 1:2.5 to obtain a nano titanium dioxide sol with a mass fraction of 1%.
10. The method for preparing ultraviolet shielding nano titanium dioxide material according to claim 9, wherein oxalic acid is added dropwise to the nano titanium dioxide sol in the step (4) to obtain an acidified nano titanium dioxide dispersion, so that the pH value of the acidified nano titanium dioxide dispersion reaches 1, and the acidified nano titanium dioxide dispersion is aged for 3 hours to obtain an orange-red acidified nano titanium dioxide dispersion.
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