CN111268996B - Preparation method of photocatalytic air purification decorative plate - Google Patents

Preparation method of photocatalytic air purification decorative plate Download PDF

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CN111268996B
CN111268996B CN202010183151.0A CN202010183151A CN111268996B CN 111268996 B CN111268996 B CN 111268996B CN 202010183151 A CN202010183151 A CN 202010183151A CN 111268996 B CN111268996 B CN 111268996B
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air purification
powder
photocatalytic air
spraying
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CN111268996A (en
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金小燕
曾亮亮
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Shaoxing Lanzhu New Material Technology Co ltd
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Shaoxing Lanzhu New Material Technology Co ltd
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Abstract

The invention discloses a preparation method of a photocatalytic air purification decorative plate, which comprises the following steps: 1) fully mixing and uniformly stirring 2-10 parts of shell powder, 0.1-5 parts of activated carbon powder and 2-8 parts of light guide agent in parts by weight, adding 0.1-1 part of silane coupling agent, and stirring for 30-60min to prepare a mixed material powder A; 2) mixing 10-20 parts of silica sol, 0.5-2 parts of water-soluble cellulose, 0.1-0.5 part of silane coupling agent, 0.01-1 part of organic silicon surfactant, 0.1-2 parts of aluminum powder and 0.1-5 parts of hydrogen peroxide by weight for 60-120min at 40-100 ℃; adding 1-6 parts of nano titanium dioxide powder under the stirring action to prepare an adhesive B; the invention has the advantages of porous adsorption, high photocatalytic efficiency and strong adhesive force between the nano titanium dioxide and the base layer.

Description

Preparation method of photocatalytic air purification decorative plate
Technical Field
The invention relates to the technical field of air purification materials, in particular to a preparation method of a photocatalytic air purification decorative plate.
Background
The air flowability of the indoor local environment of the building is poor due to the influence of furniture decorations or spatial structures in the indoor air environment of the building, the air is easy to pollute, and bacteria and viruses are easy to spread; if the indoor decorative board meets humid weather, microbes such as bacteria and viruses are easy to breed, various ammonia gas, hydrogen sulfide, nitrogen oxide and other odor gas substances are generated, and formaldehyde, toluene, benzene series, TVOC and other harmful substances are generated by part of furniture materials, so that the quality of the indoor air environment seriously affects the living health of people, and the board with the functions of resisting bacteria, viruses and air purification is arranged in the indoor decoration, so that the indoor decorative board has certain significance. With the continuous improvement of the material preparation process and technology, it is possible to coat a coating with a photocatalytic air purification function on the surface of a base material such as a bamboo fiber board, an aluminum plate, a wood composite board and the like, in order to realize the photocatalytic air purification function on the surface of the base material, the invention application with the patent application number of 201080051777.0 discloses a scheme for realizing photocatalysis by directly spraying a dense photocatalyst coating on the base material, 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 be generated to limit the application of the photocatalyst, the first is the adhesion problem of the nano titanium dioxide and the base layer, if a simple organic adhesive is adopted, the organic adhesive can be self-decomposed by the photocatalyst along with the time, and if an inorganic adhesive is adopted, the adhesion effect between the adhesive and the base plate can be greatly reduced, and the mode of directly spraying the nano titanium dioxide on the surface of the substrate has a problem that the effective air purification specific surface area of the photocatalytic nano titanium dioxide is small, and the catalytic efficiency is low because the photocatalytic coating is compact and the light utilization rate is low.
Some existing methods in the market simply add photocatalyst such as nano titanium dioxide in porous adsorptive materials such as diatom ooze or shell powder to play a role in purifying air, and similar coatings or sprays such as the diatom ooze and the shell powder are difficult to construct, the purification effect cannot be guaranteed, the performance is unstable, and the photocatalyst is easily wrapped. In addition, because the photocatalyst needs a light source for purifying air, the improvement of the specific surface area of the photocatalyst in contact with air is far from enough, 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. The porosity of the porous coating is high, organic and inorganic compounds in the air can be easily adsorbed to become nutrients of microorganisms, and microorganisms such as bacteria and fungi are bred; if the photocatalytic performance is weak and the antibacterial performance is poor, the porous adsorption coating exposed in the air for a long time is more likely to generate peculiar smell, the air purifying effect of photocatalysis is not obvious, and the air quality is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art: the preparation method of the photocatalytic air purification decorative plate has the advantages of porous adsorption, high photocatalytic efficiency and strong adhesive force between the nano titanium dioxide and the base layer.
The technical solution of the invention is as follows: a preparation method of a photocatalytic air purification decorative plate comprises the following steps:
1) fully mixing and uniformly stirring 2-10 parts of shell powder, 0.1-5 parts of activated carbon powder and 2-8 parts of light guide agent in parts by weight, adding 0.1-1 part of silane coupling agent, and stirring for 30-60min to prepare a mixed material powder A;
2) mixing 10-20 parts of silica sol, 0.5-2 parts of water-soluble cellulose, 0.1-0.5 part of silane coupling agent, 0.01-1 part of organic silicon surfactant, 0.1-2 parts of aluminum powder and 0.1-5 parts of hydrogen peroxide by weight for 60-120min at 40-100 ℃; adding 1-6 parts of nano titanium dioxide powder under the stirring action to prepare an adhesive B;
3) mixing the mixed powder A and the adhesive B according to the weight ratio of (3-10): 1, stirring for 15-30min, and mixing with deionized water to obtain the solid content of 10-10.0wt% of adsorption light-guiding spray coating agent, spraying on the surface of base material, drying by oven at 30-100 deg.C, spraying a layer of adhesive B on the surface, the spraying amount is 25-30ml/m2Drying the mixture in an oven at 30-100 ℃ to prepare an adsorption light guide coating plate;
4) 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 TiO2Nano silver titanium dioxide colloid with the content of 0.5-5.0wt% is sprayed on the coating surface of the adsorption light guide coating plate and dried at the temperature of 100-300 ℃ to obtain the photocatalytic air purification decorative plate.
The granularity range of the shell powder is less than 50 um.
The particle size range of the activated carbon powder is less than 100 um.
The light guide agent is nano silicon dioxide, and the particle size is less than 100 nm.
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 5-10 nm.
The granularity of the aluminum powder is less than 20 um.
The mass fraction of the hydrogen peroxide in the hydrogen peroxide is 30 percent.
The mass fraction of silicon dioxide in the silica sol 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 is a fiber board, a wood board, a bamboo composite board and an aluminum composite board.
The spraying amount of the adsorption light-guiding spraying agent is 10-200ml/m2。
The spraying amount of the nano silver titanium dioxide colloid is 50-200 ml/m2。
The invention has the beneficial effects that: according to the invention, the adsorption material and the light guide material are firstly uniformly stirred to prepare the mixed powder A, and the mixed powder A is added into the adhesive containing the photocatalyst, so that the adhesive improves the bonding strength of the adsorption light guide coating and the base material, and simultaneously has the effects of resisting ultraviolet rays and preventing photocatalytic decomposition. The light guide material is favorable for light to be dispersed in the coating space through transmission and/or reflection in the coating, the light guide material nano silicon dioxide and the liquid silica gel are introduced into the adsorbent (such as activated carbon and shell powder) to form a light channel, in addition, the aluminum particles have a certain scattering effect on the light to further improve the multiple refraction of the light, so that the photocatalyst (including the photocatalyst on the surface of the coating and the photocatalyst in the coating) fully receives a light source, and the coating carrier with large specific surface area is favorable for photocatalytic air purification. The specific surface of the catalyst is improved through the porous concave-convex characteristic of a substrate carrier of the light guide coating, so that the catalyst can fully contact with air, has the functions of photocatalytic air purification and antibiosis and antivirus, has the unique photoelectric effect of nano-silver, is beneficial to the effective separation of titanium dioxide photo-generated electron-hole pairs, has higher photocatalytic activity, and promotes the photocatalytic air purification reaction. The photocatalytic antibacterial antiviral porous adsorption coating disclosed by the invention is simple in preparation process, the thickness of the layer film and the proportion of each layer film 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 1
The photocatalytic air purification decorative plate is prepared according to the following steps:
1) according to the weight parts, 6 parts of shell powder with the granularity range of less than 50um, 3 parts of activated carbon powder with the granularity range of less than 100um and 5 parts of nano-silica are fully mixed and stirred uniformly, 0.5 part of silane coupling agent is added, and the mixture is stirred for 60min to prepare a mixed powder A;
2) mixing and stirring 15 parts by weight of silica sol, 0.8 part by weight of carboxymethyl cellulose, 0.3 part by weight of silane coupling agent, 0.06 part by weight of organic silicon surfactant, 0.6 part by weight of aluminum powder with the particle size of less than 20 microns and 3 parts by weight of 30% hydrogen peroxide at 90 ℃ for 120 min; adding 6 parts of anatase crystal form nano titanium dioxide powder under the stirring action to prepare an adhesive B; the mass fraction of silicon dioxide in the silica sol is 30 percent.
3) Mixing the mixture powder A and the adhesive B according to the weight ratio of 6:1, stirring for 30min, mixing with deionized water to prepare an adsorption light-guiding spraying agent with the solid content of 8.0wt%, spraying the adsorption light-guiding spraying agent on the surface of an aluminum composite plate, drying the aluminum composite plate by using a drying oven at 100 ℃, and spraying a layer of adhesive B on the surface, wherein the spraying amount is 30ml/m2Drying the substrate by a drying oven at 100 ℃ to prepare an adsorption light guide coating plate; the spraying amount of the adsorption light-guiding spraying agent is 100ml/m2。
4) Hydrolyzing and precipitating ethyl titanate in deionized water, filtering and washing to remove soluble ions to obtain precipitated titanium hydrate, dissolving the precipitated titanium hydrate with hydrogen peroxide, adding silver nitrate, controlling the pH value to be 6, and uniformly stirring under the irradiation of ultraviolet light to obtain the titanium hydrate with the Ag content of 0.01wt%, and TiO2Nano silver titanium dioxide colloid with the content of 5.0wt percent is sprayed on the coating surface of the adsorption light guide coating plate, and the spraying amount of the nano silver titanium dioxide colloid is 80 ml/m2. Drying at 250 ℃ to obtain the photocatalytic air purification decorative plate.
Comparative example 1
Preparing a photocatalysis air purification decorative plate without a light guide agent according to the following steps:
1) fully mixing and stirring 6 parts of shell powder with the granularity range of less than 50um and 3 parts of activated carbon powder with the granularity range of less than 100um uniformly in parts by weight, and stirring for 60min to prepare a mixture powder A;
2) mixing and stirring 15 parts by weight of silica sol, 0.8 part by weight of carboxymethyl cellulose, 0.3 part by weight of silane coupling agent, 0.06 part by weight of organic silicon surfactant, 0.6 part by weight of aluminum powder with the particle size of less than 20 microns and 3 parts by weight of 30% hydrogen peroxide at 90 ℃ for 120 min; adding 6 parts of anatase crystal form nano titanium dioxide powder under the stirring action to prepare an adhesive B; the mass fraction of silicon dioxide in the silica sol is 30 percent.
3) Mixing the mixture powder A and the adhesive B according to the weight ratio of 6:1, stirring for 30min, mixing with deionized water to prepare an adsorption spraying agent with the solid content of 8.0wt%, spraying the adsorption spraying agent on the surface of an aluminum composite plate, drying the adsorption spraying agent in a 100 ℃ oven, and spraying a layer of adhesive B on the surface, wherein the spraying amount is 30ml/m2Drying in a drying oven at 100 ℃ to prepare an adsorption laminate; the spraying amount of the adsorption light-guiding spraying agent is 100ml/m2。
4) Hydrolyzing and precipitating ethyl titanate in deionized water, filtering and washing to remove soluble ions to obtain precipitated titanium hydrate, dissolving the precipitated titanium hydrate with hydrogen peroxide, adding silver nitrate, controlling the pH value to be 6, and uniformly stirring under the irradiation of ultraviolet light to obtain the titanium hydrate with the Ag content of 0.01wt%, and TiO2Nano silver titanium dioxide colloid with the content of 5.0wt percent is sprayed on the coating surface of the adsorption coating plate, and the spraying amount of the nano silver titanium dioxide colloid is 80 ml/m2. Drying at 250 ℃ to obtain the photocatalytic air purification decorative plate.
Comparative example 2
Preparing a photocatalytic air purification decorative plate without nano-silver titanium dioxide particles according to the following steps:
1) according to the weight parts, 6 parts of shell powder with the granularity range of less than 50um, 3 parts of activated carbon powder with the granularity range of less than 100um and 5 parts of nano-silica are fully mixed and stirred uniformly, 0.5 part of silane coupling agent is added, and the mixture is stirred for 60min to prepare a mixed powder A;
2) mixing and stirring 15 parts by weight of silica sol, 0.8 part by weight of carboxymethyl cellulose, 0.3 part by weight of silane coupling agent, 0.06 part by weight of organic silicon surfactant, 0.6 part by weight of aluminum powder with the particle size of less than 20 microns and 3 parts by weight of 30% hydrogen peroxide at 90 ℃ for 120 min; adding 6 parts of anatase crystal form nano titanium dioxide powder under the stirring action to prepare an adhesive B; the mass fraction of silicon dioxide in the silica sol is 30 percent.
3) Weighing the mixed powder A and the adhesive BMixing and stirring the mixture for 30min at a mass ratio of 6:1 to prepare an adsorption light-guiding spraying agent with solid content of 8.0wt%, spraying the adsorption light-guiding spraying agent on the surface of an aluminum composite plate, drying the adsorption light-guiding spraying agent in a 100 ℃ oven, and spraying a layer of adhesive B on the surface, wherein the spraying amount is 30ml/m2Drying the board in a 100 ℃ oven to prepare the photocatalytic air purification decorative board; the spraying amount of the adsorption light-guiding spraying agent is 100ml/m2。
Formaldehyde removal performance test
Composite coated sheets were prepared according to the preparation methods of example 1, comparative example 1 and comparative example 2, and three sets of sheets of example 1, comparative example 1 and comparative example 2 were cut into four test boards with length and width dimensions of 500x500mm, respectively, and placed at 1m3In the test cabin, comparison test is carried out under the same conditions, the test method refers to the test step of 6.5 purification efficiency in JC/T1074-2008 'indoor air purification function coating material purification performance' standard, the photocatalysis material test is carried out, in order to obtain comparison of formaldehyde removal effects of three test boards, the test selects the illumination test time to be 2h, and the formaldehyde removal rate is measured, as shown in the following table.
Figure DEST_PATH_IMAGE001
From the test results, comparative examples 1 and 2 had a certain formaldehyde removal rate, but the efficiency was relatively lower than that of example 1. Comparative example 2 no outermost photocatalytic layer was present despite the addition of the nano-titania photocatalyst, and the efficiency was the lowest; compared with the comparative example 1 (without the light guide agent), the composite coating with the light guide agent in the embodiment 1 has higher formaldehyde removal efficiency, and the coating with the light guide agent is beneficial to light irradiation in the coating to fully contact with the photocatalyst through multiple transmission and/or refraction to play a photocatalysis role. In addition, although the porous concave-convex characteristic of the substrate coating is favorable for light absorption, the light guide material is favorable for light absorption of the coating, so that light reflection is reduced, and the removal rate of formaldehyde in photocatalysis by adding the light guide agent coating is obviously improved. The plate in the embodiment 1 has a silver-doped titanium dioxide photocatalytic nano coating on the surface, the silver-doped titanium dioxide photocatalytic nano coating has the functions of photocatalytic air purification and antibacterial and antiviral functions, and the nano silver has a unique photoelectric effect, is beneficial to the effective separation of titanium dioxide photoproduction electron-hole pairs, has higher photocatalytic activity and promotes the photocatalytic air purification reaction.
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 (8)

1. A preparation method of a photocatalytic air purification decorative plate is characterized by comprising the following steps:
1) fully mixing and uniformly stirring 2-10 parts of shell powder, 0.1-5 parts of activated carbon powder and 2-8 parts of light guide agent in parts by weight, adding 0.1-1 part of silane coupling agent, and stirring for 30-60min to prepare a mixed material powder A;
2) mixing 10-20 parts of silica sol, 0.5-2 parts of water-soluble cellulose, 0.1-0.5 part of silane coupling agent, 0.01-1 part of organic silicon surfactant, 0.1-2 parts of aluminum powder and 0.1-5 parts of hydrogen peroxide by weight for 60-120min at 40-100 ℃; adding 1-6 parts of nano titanium dioxide powder under the stirring action to prepare an adhesive B;
3) mixing the mixture powder A and the adhesive B according to the weight ratio of (3-10): 1, stirring for 15-30min, mixing with deionized water to prepare an adsorption light-guiding spraying agent with the solid content of 1.0-10.0wt%, spraying the adsorption light-guiding spraying agent on the surface of a base material, drying the base material in an oven at the temperature of 30-100 ℃, and spraying a layer of adhesive B on the surface, wherein the spraying amount is 25-30ml/m2Drying the mixture in an oven at 30-100 ℃ to prepare an adsorption light guide coating plate;
4) 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 TiO2Nano silver titanium dioxide colloid with the content of 0.5-5.0wt% is sprayed on the coating surface of the adsorption light guide coating plate and dried at the temperature of 100-300 ℃ to obtain the photocatalytic air purification decorative plate;
the granularity range of the shell powder is less than 50um, and the granularity range of the activated carbon powder is less than 100 um;
the nano titanium dioxide powder is in an anatase crystal form, and the average particle size range is 5-10 nm.
2. The preparation method of the photocatalytic air purification decorative sheet according to claim 1, wherein the aluminum powder particle size is less than 20 um.
3. The method for manufacturing a photocatalytic air purification decorative sheet according to claim 1, wherein the mass fraction of hydrogen peroxide in hydrogen peroxide is 30%.
4. The method for manufacturing a photocatalytic air purification decorative sheet according to claim 1, wherein the silica sol contains 20 to 30 mass% of silica.
5. The preparation method of the photocatalytic air purification decorative sheet 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 method for preparing a photocatalytic air purification decorative sheet 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 method for preparing the photocatalytic air purification decorative sheet according to claim 1, wherein the base material is a fiberboard, a wood board, a bamboo composite board, or an aluminum composite board.
8. The preparation method of the photocatalytic air purification decorative sheet according to claim 1, wherein the spraying amount of the adsorption light guide spraying agent is 10-200ml/m2The spraying amount of the nano silver titanium dioxide colloid is 50-200 ml/m2 。
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