CN113683910A - Photocatalytic coating with efficient photocatalytic function and preparation method thereof - Google Patents
Photocatalytic coating with efficient photocatalytic function and preparation method thereof Download PDFInfo
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 95
- 239000011248 coating agent Substances 0.000 title claims abstract description 29
- 238000000576 coating method Methods 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 120
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 40
- 239000000049 pigment Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 17
- 239000013078 crystal Substances 0.000 claims abstract description 16
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 16
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 16
- 239000011230 binding agent Substances 0.000 claims abstract description 14
- 150000001879 copper Chemical class 0.000 claims abstract description 14
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 10
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 10
- 239000003899 bactericide agent Substances 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims 1
- 239000011941 photocatalyst Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 8
- 239000012855 volatile organic compound Substances 0.000 description 8
- 229910002089 NOx Inorganic materials 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 4
- 229910001431 copper ion Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000007146 photocatalysis Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 239000004606 Fillers/Extenders Substances 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- -1 hydroxyl radicals Chemical class 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 2
- OUUQCZGPVNCOIJ-UHFFFAOYSA-M Superoxide Chemical compound [O-][O] OUUQCZGPVNCOIJ-UHFFFAOYSA-M 0.000 description 2
- 239000000370 acceptor Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000006798 recombination Effects 0.000 description 2
- 238000005215 recombination Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical class [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910021532 Calcite Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 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
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a photocatalytic coating with a high-efficiency photocatalytic function, which relates to the technical field of photocatalysts and comprises the following components in percentage by weight: 25-65% of photocatalytic titanium dioxide generated by anatase and rutile mixed crystal reaction; 5-10% of rare earth long-acting noctilucent powder; 1-5% of copper salt; 1-8% of a binder; 10-20% of pigment, 1-5% of antifoaming agent and 1-3% of bactericide. The invention also provides a preparation method of the photocatalytic coating with the efficient photocatalytic function, and the photocatalytic coating with the efficient photocatalytic function improves the photocatalytic efficiency.
Description
Technical Field
The invention relates to the technical field of photocatalysts, in particular to a photocatalytic coating with a high-efficiency photocatalytic function.
Background
At present, the kitchen ware industry is increasingly developed, the use frequency of range hoods is continuously increased, smoke containing a large amount of pollutants is discharged by products of part of enterprises, and the smoke generally contains CO and SO2One or more of Volatile Organic Compounds (VOC), NOx, etc. cause an unpleasant odor in the air and cause environmental damage, and thus it has become common knowledge in various societies to find a material that can efficiently degrade or adsorb a polluted gas. The degradation or adsorption of polluted gases by titanium dioxide, i.e. the transition of electrons from the valence band to the conduction band under the action of Ultraviolet (UV) and near UV radiation, is commonly carried out in the prior art, so that the semiconductor material titanium dioxide has photocatalytic properties, thereby degrading NOx and Volatile Organic Compounds (VOC) in the air. In view of these properties, the prior art has generally used coatingsEtc. to remove contaminants from the air. The patent of the patent with the application number of 201410781164.2 and the name of a luminescent photocatalytic coating and a preparation method thereof improves the photocatalytic efficiency of the coating by adding rare earth long-acting noctilucent powder, and does not consider the phenomenon that hole charges and photo-generated electrons are compounded to influence the photocatalytic efficiency.
The forbidden band width of titanium dioxide is 3.12eV, and the titanium dioxide can only absorb an ultraviolet light region with the wavelength less than 387nm, so that the utilization rate of sunlight energy is only about 4%, the light conversion efficiency is low, the photocatalysis efficiency is low, and the efficiency of treating the polluted gas is low.
Disclosure of Invention
The invention mainly aims to provide a photocatalytic coating with a high-efficiency photocatalytic function, and aims to solve the technical problem of low photocatalytic efficiency of the existing photocatalytic coating.
In order to realize the aim, the invention provides a photocatalytic coating with high-efficiency photocatalytic function, wherein 25-65% of photocatalytic titanium dioxide is generated by mixed crystal reaction of anatase and rutile;
5-10% of rare earth long-acting noctilucent powder;
1-5% of copper salt;
1-8% of a binder;
10-20% of pigment, 1-5% of antifoaming agent and 1-3% of bactericide.
Preferably, the volume ratio of anatase to rutile produced from anatase is 9.5-9.0: 0.5-1.0.
Preferably, the photocatalytic titanium dioxide has a crystallite size of about 5nm to about 20nm, and the photocatalytic titanium dioxide has photocatalytic activity in the presence of visible light.
Preferably, the pigment comprises non-photocatalytic titanium dioxide and calcium carbonate.
Preferably, the total pigment volume concentration in the pigment is between 70% and 75%.
Preferably, the binder comprises methyl methacrylate and propylene glycol.
In order to obtain the photocatalytic coating with high-efficiency photocatalytic function, a preparation method of the photocatalytic coating with high-efficiency photocatalytic function is provided, and comprises the following steps:
mixing anatase and rutile uniformly, and heating at 500 ℃ for 2 hours to obtain photocatalytic titanium dioxide, wherein the content of the photocatalytic titanium dioxide is 25-65%;
the photocatalytic titanium dioxide is added with rare earth long-acting noctilucent powder, copper salt, binder, pigment, antifoaming agent and bactericide, wherein the content of the rare earth long-acting noctilucent powder is 5-10%, the content of the copper salt is 1-5%, the content of the binder is 1-8%, the content of the pigment is 10-20%, the content of the antifoaming agent is 1-5%, and the content of the bactericide is 1-3%.
The invention has the beneficial effects that: the rare earth long-acting luminous powder absorbs light under the irradiation of light sources such as sunlight or lamplight, converts the absorbed light energy and stores the converted light energy in crystal lattices, and can convert the energy into light energy to emit light in dark places, thereby improving the photocatalytic efficiency of the coating. In addition, the photocatalytic titanium dioxide belongs to a semiconductor crystal lattice and has defects in different degrees, after the copper salt is added, because copper ions are good acceptors of electrons, photo-generated electrons can be captured, and because the copper ions compete for the photo-generated electrons, the probability of recombination of the photo-generated electrons and holes in the photocatalytic titanium dioxide is reduced, so that the photocatalytic efficiency can be improved.
Detailed Description
The invention is further illustrated by the following examples:
the following is a first embodiment of the present invention, in which a photocatalytic coating having a high photocatalytic function comprises the following components: 25-65% of photocatalytic titanium dioxide generated by anatase and rutile mixed crystal reaction; 5-10% of rare earth long-acting noctilucent powder; 1-5% of copper salt; 1-8% of a binder; 10-20% of pigment, 1-5% of antifoaming agent and 1-3% of bactericide. The photocatalytic titanium dioxide refers to titanium dioxide with photocatalytic activity in the presence of visible light, and the proportion of the photocatalytic titanium dioxide in the photocatalytic coating with high-efficiency photocatalytic function is 25-65%. The above percentage data respectively represent the volume ratio of each component in the photocatalytic coating having a high photocatalytic function according to the present invention when the component is in a solid state.
Titanium dioxide has three crystal forms, anatase, rutile and brookite. Anatase type and rutile type have a photocatalytic function. The mixed crystal of anatase and rutile has better activity, and therefore, the photocatalytic coating having a high photocatalytic function in this embodiment includes the components of anatase and rutile.
Because the crystal structures of the rutile and the anatase are different, the separation of photo-generated electrons and hole charges in the anatase crystal can be effectively promoted, i.e. a mixed crystal effect occurs, electrons jump from the valence band to the conduction band under the action of Ultraviolet (UV) and near-UV radiation, so that the semiconductor material titanium dioxide has photocatalytic performance, the generated reactive photo-generated electron-hole charge pair is transferred to the surface of titanium dioxide particles, the hole charges on the surface of the titanium dioxide particles oxidize the adsorbed water to produce reactive hydroxyl radicals, and photo-generated electrons reduce the adsorbed oxygen to produce superoxide radicals, both of which are capable of degrading NOx and Volatile Organic Compounds (VOCs) in the air, because of the mixed crystal effect, more hole charges and photo-generated electrons can be obtained, and the photo-generated electrons have stronger reducibility and can catalyze O on the surface of the titanium dioxide.2The reduction is superoxide radical, the hole charge oxidizes the adsorbed water to generate reactive hydroxyl radical, more superoxide radical and more hydroxyl radical can be utilized to efficiently finish the photocatalytic degradation of NOx and Volatile Organic Compounds (VOC) in the air, and the photocatalytic efficiency is improved.
The oil fume gas discharged by the range hood generally contains harmful gases such as CO, NOx and the like, so that the environment is polluted, the human health is damaged, and more photoproduction electrons are obtained due to the occurrence of the mixed crystal effect, so that the degradation efficiency of the harmful gases can be improved. Similarly, under the irradiation of an ultraviolet lamp, acetaldehyde and formaldehyde in the room can be more effectively degraded. The term "NOx" refers to the species NO (nitric oxide) and NO, collectively or individually2(nitrogen dioxide).
The long-acting rare earth luminous powder has the capability of absorbing light for a short time, converting the absorbed light energy and storing the converted light energy in crystal lattices, and converting the energy into the light energy to emit light in a dark place, so that the photocatalysis time can be prolonged. The luminous RE powder is named as long afterglow luminous RE material, and includes aluminate series and silicate series. The rare earth noctilucent powder can absorb and store energy and convert the absorbed energy into visible light when being subjected to sunlight, fluorescent lamps and other artificial light sources, for example, the rare earth noctilucent powder can absorb and store energy when being excited by ultraviolet rays, convert the absorbed energy into visible light, and can continuously emit light after excitation is stopped, so that titanium dioxide is continuously excited to generate photocatalytic reaction, and harmful gases such as CO, NOx and the like in oil fume gas discharged by the range hood are continuously degraded. The long-acting luminous powder of rare earth who contains in this embodiment still effectively improves the photocatalysis efficiency of photocatalysis titanium dioxide when practicing thrift the electric quantity.
The photocatalytic titanium dioxide belongs to semiconductor crystal lattices, and lattice defects exist to different degrees, after copper salt is added, because copper ions in the copper salt are good acceptors of photo-generated electrons, the photo-generated electrons can be captured, and because the copper ions compete for the photo-generated electrons, the recombination probability of the photo-generated electrons and hole charges in the photocatalytic titanium dioxide is reduced, and the photocatalytic efficiency can be improved. The copper salt here may be copper chloride or copper nitrate.
The following is a second embodiment of the present invention in which the volume ratio of anatase to rutile produced from anatase is 9.5-9.0:0.5-1.0, and since it is anatase that mainly plays a photocatalytic role, in this embodiment the volume of anatase is greater than the volume of rutile, where anatase and rutile are in the solid state.
The following is a third example of the invention in which the photocatalytic titanium dioxide has a grain size of about 5nm to 20nm, and when the term "about" is used to modify the particle size, it should be understood to include particle sizes that are slightly larger or smaller than the indicated values, as there is inherent experimental error in the measurement and variability between different methods of measuring the grain size, as will be apparent to those skilled in the art. The diameter can be measured by, for example, Transmission Electron Microscopy (TEM) and XRD.
The photocatalytic titanium dioxide has photocatalytic activity in the presence of visible light, and as the grain size decreases, the light absorption boundary shifts blue and the photocatalytic efficiency is higher, and in this embodiment, the grain size of the photocatalytic titanium dioxide is about 5nm to 20 nm.
The following is a fourth example of the present invention in which pigments include, but are not limited to, non-photocatalytic titanium dioxide and calcium carbonate. Included are any particulate organic or inorganic compounds capable of providing hiding power to the coating.
The following is a fifth example of the invention in which the total pigment volume concentration in the pigment is between 70% and 75%. Pigment Volume Concentration (PVC) refers to the ratio of the volume of the color and extender pigments in the coating to the total volume of all non-volatile components of the formulation, including emulsion solids, color and extender pigments. Extender pigments may include barium, calcium, magnesium, or aluminum salts, silicon or aluminum oxides, or complex double salts derived from the first two classes, and colored pigments may include titanium dioxide, lithopone PW-5, lead chrome yellow PY-34, quinacridone PR-207, red iron oxide PR-101, phthalocyanine blue PB-15, and the like.
The following is a sixth embodiment of the present invention, in which the binder comprises methylmethacrylate and propylene, and the binder forms an adherent film on the surface of the substrate. Various other compounds may also be added to the compositions of the present invention if desired, but preferably compounds are added that do not impair the shelf life and photoactivity of the resulting coating. For example, one or more of quartz, calcite, clay, talc, and/or Na-Al-silicate, and the "plurality" in this embodiment refers to two or more.
The following is a seventh embodiment of the present invention, in this embodiment, anatase and rutile are mixed uniformly, and heated at 500 ℃ for 2 hours to obtain photocatalytic titanium dioxide, the content of the photocatalytic titanium dioxide is 25-65%; the method comprises the steps of adding rare earth long-acting noctilucent powder, copper salt, binder, pigment, antifoaming agent and bactericide into photocatalytic titanium dioxide, wherein the content of the rare earth long-acting noctilucent powder is 5-10%, the content of the copper salt is 1-5%, the content of the binder is 1-8%, the content of the pigment is 10-20%, the content of the antifoaming agent is 1-5%, and the content of the bactericide is 1-3%, and finally obtaining the photocatalytic coating with the high-efficiency photocatalytic function.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A photocatalytic coating material having a high-efficiency photocatalytic function, characterized by comprising:
25-65% of photocatalytic titanium dioxide generated by anatase and rutile mixed crystal reaction;
5-10% of rare earth long-acting noctilucent powder;
1-5% of copper salt;
1-8% of a binder;
10-20% of pigment, 1-5% of antifoaming agent and 1-3% of bactericide.
2. The photocatalytic coating material having a high photocatalytic function according to claim 1, wherein the volume ratio between said anatase and said rutile is 9.5-9.0: 0.5-1.0.
3. The photocatalytic coating material having a high photocatalytic function according to claim 1, wherein the photocatalytic titanium oxide has a crystal grain size of about 5nm to 20nm, and has photocatalytic activity in the presence of visible light.
4. The photocatalytic coating material having a high photocatalytic function according to claim 1, wherein the pigment comprises non-photocatalytic titanium dioxide and calcium carbonate.
5. The photocatalytic coating material having a high photocatalytic function according to claim 1, wherein the total pigment volume concentration in the pigment is between 70% and 75%.
6. The photocatalytic coating material with high photocatalytic function according to claim 1, wherein the binder comprises methyl methacrylate and propylene.
7. A preparation method of a photocatalytic coating with a high-efficiency photocatalytic function comprises the following steps:
mixing anatase and rutile uniformly, and heating at 500 ℃ for 2 hours to obtain photocatalytic titanium dioxide, wherein the content of the photocatalytic titanium dioxide is 25-65%;
the photocatalytic titanium dioxide is added with rare earth long-acting noctilucent powder, copper salt, binder, pigment, antifoaming agent and bactericide, wherein the content of the rare earth long-acting noctilucent powder is 5-10%, the content of the copper salt is 1-5%, the content of the binder is 1-8%, the content of the pigment is 10-20%, the content of the antifoaming agent is 1-5%, and the content of the bactericide is 1-3%.
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