CN111282559B - Preparation method of photocatalytic antibacterial porous adsorption air purification coating - Google Patents
Preparation method of photocatalytic antibacterial porous adsorption air purification coating Download PDFInfo
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- CN111282559B CN111282559B CN202010183152.5A CN202010183152A CN111282559B CN 111282559 B CN111282559 B CN 111282559B CN 202010183152 A CN202010183152 A CN 202010183152A CN 111282559 B CN111282559 B CN 111282559B
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- 238000000576 coating method Methods 0.000 title claims abstract description 69
- 239000011248 coating agent Substances 0.000 title claims abstract description 66
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 62
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 38
- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 28
- 238000004887 air purification Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000005507 spraying Methods 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 16
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- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 26
- 239000002131 composite material Substances 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- 239000000084 colloidal system Substances 0.000 claims description 21
- 239000010949 copper Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 19
- 229910052802 copper Inorganic materials 0.000 claims description 16
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 15
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 239000004408 titanium dioxide Substances 0.000 claims description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000004566 building material Substances 0.000 claims description 6
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 150000003608 titanium Chemical class 0.000 claims description 5
- 229920002678 cellulose Polymers 0.000 claims description 4
- 239000001913 cellulose Substances 0.000 claims description 4
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims description 4
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims description 4
- AKMXMQQXGXKHAN-UHFFFAOYSA-N titanium;hydrate Chemical compound O.[Ti] AKMXMQQXGXKHAN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002657 fibrous material Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 3
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- RFRMMZAKBNXNHE-UHFFFAOYSA-N 6-[4,6-dihydroxy-5-(2-hydroxyethoxy)-2-(hydroxymethyl)oxan-3-yl]oxy-2-(hydroxymethyl)-5-(2-hydroxypropoxy)oxane-3,4-diol Chemical compound CC(O)COC1C(O)C(O)C(CO)OC1OC1C(O)C(OCCO)C(O)OC1CO RFRMMZAKBNXNHE-UHFFFAOYSA-N 0.000 claims description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- 229920006217 cellulose acetate butyrate Polymers 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims description 2
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- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 2
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- 238000000034 method Methods 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 229910000349 titanium oxysulfate Inorganic materials 0.000 claims description 2
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 2
- 239000011247 coating layer Substances 0.000 claims 1
- 239000011941 photocatalyst Substances 0.000 abstract description 9
- 239000000758 substrate Substances 0.000 abstract description 8
- 238000002156 mixing Methods 0.000 abstract description 5
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 18
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- 230000000052 comparative effect Effects 0.000 description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 5
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- 239000011425 bamboo Substances 0.000 description 5
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- 238000007146 photocatalysis Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- XQCUWCZUYXJXRL-UHFFFAOYSA-N copper dioxosilane Chemical compound [Si](=O)=O.[Cu] XQCUWCZUYXJXRL-UHFFFAOYSA-N 0.000 description 3
- 239000005543 nano-size silicon particle Substances 0.000 description 3
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- 241000894006 Bacteria Species 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
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- 241000588724 Escherichia coli Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
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- 239000012496 blank sample Substances 0.000 description 1
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- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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- A01N25/08—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing solids as carriers or diluents
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
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- 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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
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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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Abstract
The invention discloses a preparation method of a photocatalytic antibacterial porous adsorption air purification coating, which is characterized in that an adsorption light guide coating which has an adsorption function and a rough and porous surface and can guide light is prepared by mixing an adsorption material, a light guide material and a photocatalyst and spraying the mixture on the surface of a substrate.
Description
Technical Field
The invention relates to the technical field of air purification materials, in particular to a preparation method of a photocatalytic antibacterial porous adsorption air purification coating.
Background
With the continuous improvement of material preparation technology and technology, it is possible to coat a layer of coating with air purification function on the surface of base materials such as plastic, aluminum plate, ceramic tile, fiber composite board, etc., in order to realize the photocatalytic purification function on the surface of the base plate, the invention application with the patent application number of 201080051777.0 discloses a scheme for directly spraying a compact photocatalyst coating on the base plate to realize photocatalysis, but because the photocatalyst nano titanium dioxide is mainly added in a way of adhering to the surface layer of the base layer, a plurality of defects can appear to limit the application of the photocatalyst, and the way of directly spraying the nano titanium dioxide on the surface of the base plate can effectively carry out photocatalysis with small specific surface area and low catalytic efficiency.
Some existing products in the market simply add photocatalyst such as nano titanium dioxide into porous adsorptive material such as diatom ooze or shell powder to purify air. However, since the photocatalyst needs a light source for purifying air, it is far from enough to improve the specific surface area of the photocatalyst in contact with air, and the utilization rate of the photocatalyst in the porous adsorption coating to light needs to be improved, so that the catalytic efficiency can be improved. And the porosity of the porous coating is high, microbes such as bacteria and fungi are easy to breed, organic and inorganic compounds in the adsorbed air become nutrients of the microbes, and if the photocatalytic performance of the porous coating is weak, the porous adsorption coating exposed in the air for a long time can generate peculiar smell to influence the air quality.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art: provides a preparation method of a photocatalytic antibacterial porous adsorption air purification coating with porous adsorption and high photocatalytic efficiency.
The technical solution of the invention is as follows: a preparation method of a photocatalytic antibacterial porous adsorption air purification coating comprises the following steps:
1) The following components in parts by weight are fully mixed with deionized water to prepare the adsorption light-guiding spraying agent with the solid content of 1.0-20.0 wt%: 5-15 parts of shell powder, 1-7 parts of activated carbon powder, 2-8 parts of light guide agent, 1-6 parts of nano titanium dioxide, 0.5-2 parts of water-soluble cellulose, 0.1-2 parts of aluminum powder, 0.2-3 parts of hydrogen peroxide and 10-20 parts of silica sol; spraying the adsorption light-conducting spraying agent on the surface of a base material, and drying at 30-100 ℃ to prepare an adsorption light-conducting coating;
2) Preparing silica sol into a solution with the mass fraction of silicon dioxide of 0.1-5%, adding copper nitrate, dissolving and stirring uniformly, controlling the pH value to be 6-9, and adding NaBH 4 Preparing a solution into a nano copper colloid with the Cu content of 0.01-5.0wt%, spraying the nano copper colloid on the adsorption light guide coating prepared in the step 1), and drying at 30-100 ℃ to prepare a double-layer composite coating;
3) Hydrolyzing titanium salt in deionized water for precipitation, filtering, washing to remove soluble ions to obtain precipitated titanium hydrate, dissolving the precipitated titanium hydrate with hydrogen peroxide, adding silver nitrate, controlling pH to 4-8, stirring under ultraviolet irradiation to obtain the final product with Ag content of 0.001-1.0wt%, tiO 2 Nano silver titanium dioxide colloid with the content of 0.5-5.0wt%, spraying the nano silver titanium dioxide colloid on the double-layer composite coating prepared in the step 2), and drying at 100-300 ℃ to obtain the photocatalytic antibacterial porous adsorption coating consisting of three layers of composite coatings.
The granularity range of the shell powder is less than 100um.
The particle size range of the activated carbon powder is less than 200um.
The light guide agent is nano silicon dioxide, and the particle size is less than 100nm.
The nano titanium dioxide powder is in an anatase crystal form, the particle size is not more than 100nm, and the optimal average particle size range is 5-10nm.
The granularity of the aluminum powder is less than 20um.
The mass fraction of the hydrogen peroxide in the hydrogen peroxide is 30 percent.
The mass fraction of silicon dioxide in the silica sol liquid is 20-30%.
The water-soluble cellulose is one or a mixture of more of cellulose acetate butyrate, carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose.
The titanium salt is one or more of ethyl titanate, butyl titanate, titanium isopropoxide, titanium tetrachloride and titanyl sulfate.
The base material comprises one or more of inorganic building materials, organic building materials, metal materials or fiber materials.
The inorganic building material is ceramic tile, glass, clay plate and concrete.
The organic building material is wood, bamboo composite board and aluminum composite board.
The metal material comprises an aluminum net, an iron net and an aluminum honeycomb.
The fiber material comprises a carbon fiber net, a glass fiber net and a textile fabric.
The spraying amount of the adsorption light-guiding spraying agent is 100-300ml/m 2 。
The spraying amount of the nano copper colloid is 10-120 ml/m 2 。
The spraying amount of the nano-silver titanium dioxide colloid is 50-200 ml/m 2 。
The invention has the beneficial effects that: the adsorption light guide coating which has adsorption function and is rough in surface, porous and light-conductive is prepared by mixing an adsorption material, a light guide material and a photocatalyst and spraying the mixture on the surface of a substrate. Then, an antibacterial scattering nano layer is introduced on the adsorption light guide coating, the layer is a nano copper silicon dioxide transparent layer, a layer of nano copper colloid is uniformly coated on the surface of the adsorption light guide coating which is mainly provided with a concave-convex porous structure on the substrate, nano copper particles are uniformly distributed in the nano copper colloid, light entering the coating has a light reflection effect on the nano copper particles, a Tyndall effect is generated, and the utilization rate of the photocatalysis light is further improved; in addition, the antibacterial performance of the porous adsorption light guide coating can be improved by introducing the nano copper. The silver-doped titanium dioxide photocatalytic nano coating on the outermost layer improves the specific surface of the catalyst due to the porous concave-convex coating of the porous adsorption light guide coating, can realize sufficient contact with air, and has photocatalytic air purification and antibacterial functions, wherein nano silver titanium dioxide colloid has higher photocatalytic activity, and the heterojunction made of different materials and the nano structural characteristic of the nano copper silicon dioxide transparent layer and the nano silver titanium dioxide layer are favorable for effectively separating titanium dioxide photo-generated electron-hole pairs and promoting photocatalytic air purification reaction. The photocatalytic antibacterial porous adsorption coating disclosed by the invention is simple in preparation process, the thickness of each single film and the proportion of each film layer can be controlled by spraying, the coating is easy to coat, the coating can be produced, popularized and applied in a large scale, and the coating is suitable for the surfaces of various substrates and has a good effect.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
Example one
1) The following components in parts by weight are fully mixed with deionized water to prepare the adsorption light-guiding spraying agent with the solid content of 10.0 wt%: 8 parts of shell powder (average particle size of 20 um), 3 parts of activated carbon powder (average particle size of 40 um), 5 parts of nano silicon dioxide (average particle size of 20 nm), 4 parts of nano titanium dioxide (average particle size of 5 nm), 1 part of hydroxypropyl methyl cellulose, 0.5 part of aluminum powder (average particle size of 5 um), 1 part of hydrogen peroxide (mass fraction of 30%), and silica sol (SiO 2) 2 Content mass fraction 20%) 14 portions; spraying the adsorption light guide spraying agent on the surface of the bamboo composite board substrate, and drying at 30-100 ℃ to prepare an adsorption light guide coating;
2) Preparing the silica sol into a solution with the mass fraction of silicon dioxide of 2.5 percent, adding 0.5g of copper nitrate, dissolving and stirring uniformly, controlling the pH value to be 8, and adding NaBH under the condition of rapid stirring 4 Solution (0.4 g NaBH) 4 Dissolving in 10ml of deionized water), fully reacting, changing the sol liquid from semitransparent light blue into dark brown to prepare nano copper colloid with the Cu content of 0.10wt%, spraying the nano copper colloid on the adsorption light guide coating prepared in the step 1), and drying at 30-100 ℃ to prepare a double-layer composite coating;
3) Adding 5ml ethyl titanate into 100ml deionized water, slowly stirring to hydrolyze and precipitate titanium salt, standing for 2h, filtering, washing to remove soluble ions to obtain white precipitate hydrate, and adding waterMixing the color precipitate hydrate with 50ml of deionized water, adding 5ml of hydrogen peroxide, stirring for dissolving, adding 0.1g of silver nitrate, controlling the pH value to be 6, uniformly stirring under the irradiation of an ultraviolet lamp (with the wavelength of 254nm and the power of 10 w), diluting with deionized water to obtain the product with the Ag content of 0.03wt%, and preparing TiO 2 Nano silver titanium dioxide colloid with the content of 0.9wt%, spraying the nano silver titanium dioxide colloid on the double-layer composite coating prepared in the step 2), and drying at 100 ℃ to obtain the photocatalytic antibacterial porous adsorption coating consisting of the three-layer composite coating.
Comparative example 1
Making adsorption light-conducting coating
Fully mixing the following components in parts by weight with deionized water to prepare the adsorption light-guiding spraying agent with the solid content of 10.0 wt%: 8 parts of shell powder (average particle size of 20 um), 3 parts of activated carbon powder (average particle size of 40 um), 5 parts of nano silicon dioxide (average particle size of 20 nm), 4 parts of nano titanium dioxide (average particle size of 5 nm), 1 part of hydroxypropyl methyl cellulose, 0.5 part of aluminum powder (average particle size of 5 um), 1 part of hydrogen peroxide (mass fraction of 30%), and silica sol (SiO 2) 2 Content mass fraction 20%) 14 parts; and spraying the adsorption light guide spraying agent on the surface of the bamboo composite board substrate, and drying at 30-100 ℃ to prepare the adsorption light guide coating.
Comparative example No. two
Making adsorption coating without light guide function
Fully mixing the following components in parts by weight with deionized water to prepare the adsorption light-guiding spraying agent with the solid content of 10.0 wt%: 8 parts of shell powder (average particle size of 20 um), 3 parts of activated carbon powder (average particle size of 40 um), 4 parts of nano titanium dioxide (average particle size of 5 nm), 1 part of hydroxypropyl methyl cellulose, 0.5 part of aluminum powder (average particle size of 5 um), 1 part of hydrogen peroxide (mass fraction of 30%), and silica Sol (SiO) 2 Content mass fraction 20%) 14 portions; the adsorption light-guiding spraying agent is sprayed on the surface of a bamboo composite board substrate and dried at 30-100 ℃ to prepare an adsorption light-guiding coating
Comparative example No. three
Preparation of double-layer composite coating with adsorption function
1) Fully mixing the following components in parts by weight with deionized waterPreparing the adsorption light-guiding spraying agent with solid content of 10.0 wt%: 8 parts of shell powder (average particle size of 20 um), 3 parts of activated carbon powder (average particle size of 40 um), 5 parts of nano-silica (average particle size of 20 nm), 4 parts of nano-titanium dioxide (average particle size of 5 nm), 1 part of hydroxypropyl methyl cellulose, 0.5 part of aluminum powder (average particle size of 5 um), 1 part of hydrogen peroxide (mass fraction of 30%), and silica sol (SiO 2) 2 Content mass fraction 20%) 14 portions; spraying the adsorption light-conducting spraying agent on the surface of the bamboo composite board substrate, and drying at 30-100 ℃ to prepare an adsorption light-conducting coating;
2) Preparing the silica sol into a solution with the mass fraction of silicon dioxide of 2.5 percent, adding 0.5g of copper nitrate, dissolving and stirring uniformly, controlling the pH value to be 8, and adding NaBH under the condition of rapid stirring 4 Solution (0.4 g NaBH) 4 Dissolving in 10ml of deionized water), fully reacting, changing the sol liquid from semitransparent light blue into dark brown, preparing nano copper colloid with the Cu content of 0.10wt%, spraying the nano copper colloid on the adsorption light guide coating prepared in the step 1), and drying at 30-100 ℃ to obtain the double-layer composite coating.
Formaldehyde removal performance test
Composite coated sheets prepared by the methods of example 1, comparative example 2 and comparative example 3 were cut into 1000X1000mm in size and placed at 1m 3 In the test cabin, a comparison test is carried out under the same condition, the test is carried out according to the test steps in 6.5 purification efficiency in JC/T1074-2008 'indoor air purification function coating material purification performance' standard, the light test time is selected to be 2h in order to obtain the comparison test of the formaldehyde removal effect of four composite coating plates, and the formaldehyde photocatalytic performance is measured.
From the test results, the formaldehyde purification efficiency of the coating after the light guide agent is added is improved, the middle layer of the silicon dioxide uniformly dispersed by nano-copper is introduced into the composite coating, the formaldehyde is favorably removed by photocatalysis, and the formaldehyde removal effect of the photocatalytic antibacterial porous adsorption coating consisting of the three layers of the composite coating is higher.
Test of coating Sterilization Properties
The composite coating is prepared by spraying the coating preparation method in the embodiment 1, the comparative example 1 and the comparative example 3 on the aluminum-plastic plate, cutting the aluminum-plastic plate into the size of 100mmx100mm, adhering a sealing circle (the height of the edge of the circle is 5 mm) with the diameter of 70mm on the plate, dripping the Escherichia coli strain liquid into the sealing circle without leaking the bacterial liquid, and sterilizing the sealing circle before taking out the bacteria and culturing. Testing according to 5.5 operation steps in GB/T23763-2009 evaluation of antibacterial properties of photocatalytic antibacterial materials and products, sterilizing, inoculating, culturing for 24h, and testing photocatalytic sample conditions (the sample is irradiated to a sample plate with a UVA ultraviolet lamp with a light intensity of 0.01mW/cm 2 -0.1mW/cm 2 Test, see GB/T23763-2009), dark condition test (test without light). Respectively eluting and counting a blank sample, a light sample and a dark sample after culture (refer to GB/T4789.2), and calculating the sterilization rate R of the samples General (1) . The numerical values are expressed in%, and the calculation formula is as follows
R General assembly =[（C 0 -C 1 ）/C 0 ]×100
In the formula: c 0 The number of viable counts in cfu of the control samples after incubation under light conditions
C 1 The number of viable counts, in cfu, of the photocatalytic samples cultured in the open condition
The antibacterial contribution value of the photocatalytic material under UVA irradiation is R Light (es) The numerical value is expressed in percent, and the calculation formula is as follows
R Light (es) =[（B 1 -C 1 ）/B 1 ]×100
In the formula: b is 1 The number of viable counts, in cfu, of the photocatalytic samples cultured in the dark
According to the test results, the sterilization efficiency can be improved by adding the nano copper silicon dioxide layer in the middle layer, the bacterial reproduction of the porous adsorption bottom layer is reduced, the air purification is facilitated, and the antibacterial performance of the photocatalytic antibacterial porous adsorption coating formed by the three layers of composite coatings is obviously improved.
The above are merely characteristic embodiments of the present invention, and do not limit the scope of the present invention in any way. All technical solutions formed by equivalent exchanges or equivalent substitutions fall within the protection scope of the present invention.
Claims (9)
1. A preparation method of a photocatalytic antibacterial porous adsorption air purification coating is characterized by comprising the following steps:
1) The following components in parts by weight are fully mixed with deionized water to prepare the adsorption light guide spraying agent with the solid content of 1.0-20.0 wt%: 5-15 parts of shell powder, 1-7 parts of activated carbon powder, 2-8 parts of light guide agent, 1-6 parts of nano titanium dioxide, 0.5-2 parts of water-soluble cellulose, 0.1-2 parts of aluminum powder, 0.2-3 parts of hydrogen peroxide and 10-20 parts of silica sol; spraying the adsorption light guide spraying agent on the surface of a base material, and drying at 30-100 ℃ to prepare an adsorption light guide coating;
2) Preparing silica sol into a solution with the mass fraction of silicon dioxide of 0.1-5%, adding copper nitrate, dissolving and stirring uniformly, controlling the pH value to be 6-9, and adding NaBH 4 Preparing a solution into a nano copper colloid with the Cu content of 0.01-5.0wt%, spraying the nano copper colloid on the adsorption light guide coating prepared in the step 1), and drying at 30-100 ℃ to prepare a double-layer composite coating;
3) Hydrolyzing titanium salt in deionized water for precipitation, filtering, washing to remove soluble ions to obtain precipitated titanium hydrate, dissolving the precipitated titanium hydrate with hydrogen peroxide, adding silver nitrate, controlling pH to 4-8, stirring under ultraviolet irradiation to obtain the final product with Ag content of 0.001-1.0wt%, and TiO 2 Nano silver titanium dioxide colloid with the content of 0.5-5.0wt%, spraying the nano silver titanium dioxide colloid on the double-layer composite coating prepared in the step 2), and drying at 100-300 ℃ to obtain a photocatalytic antibacterial porous adsorption coating consisting of three layers of composite coatings;
the particle size range of the shell powder is less than 100um, the particle size range of the activated carbon powder is less than 200um, the light guide agent is nano-silica, the particle size is less than 100nm, the nano-titanium dioxide powder is in an anatase crystal form, and the particle size is not more than 100nm.
2. The preparation method of the photocatalytic antibacterial porous adsorption air purification coating as claimed in claim 1, wherein the aluminum powder particle size is less than 20um.
3. The preparation method of the photocatalytic antibacterial porous adsorption air purification coating layer according to claim 1, wherein the mass fraction of hydrogen peroxide in hydrogen peroxide is 30%.
4. The preparation method of the photocatalytic antibacterial porous adsorption air purification coating as claimed in claim 1, wherein the mass fraction of silica in the silica sol liquid is 20-30%.
5. The preparation method of the photocatalytic antibacterial porous adsorption air purification coating according to claim 1, wherein the water-soluble cellulose is one or a mixture of more of cellulose acetate butyrate, carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl cellulose.
6. The preparation method of the photocatalytic antibacterial porous adsorption air purification coating according to claim 1, wherein the titanium salt is one or more of ethyl titanate, butyl titanate, titanium isopropoxide, titanium tetrachloride and titanyl sulfate.
7. The preparation method of the photocatalytic antibacterial porous adsorption air purification coating as claimed in claim 1, wherein the base material comprises one or more of inorganic building materials, organic building materials, metal materials or fiber materials.
8. The method for preparing the photocatalytic antibacterial porous adsorption air purification coating as claimed in claim 1, wherein the spraying amount of the adsorption light guide spraying agent is 100-300ml/m 2 。
9. The preparation method of the photocatalytic antibacterial porous adsorption air purification coating as claimed in claim 1, wherein the spraying amount of the sprayed nano copper colloid is 10-120 ml/m 2 The spraying amount of the nano-silver titanium dioxide colloid is 50-200 ml/m 2 。
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