CN108912887B - Diatom ooze coating capable of degrading formaldehyde and used for interior decoration - Google Patents

Diatom ooze coating capable of degrading formaldehyde and used for interior decoration Download PDF

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CN108912887B
CN108912887B CN201810726370.1A CN201810726370A CN108912887B CN 108912887 B CN108912887 B CN 108912887B CN 201810726370 A CN201810726370 A CN 201810726370A CN 108912887 B CN108912887 B CN 108912887B
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diatomite
diatom ooze
ooze coating
formaldehyde
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CN108912887A (en
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傅璐桦
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Huizhou yongshenghui Industrial Co., Ltd
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    • 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
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • 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
    • 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
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • 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
    • C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
    • D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material

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  • Engineering & Computer Science (AREA)
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  • General Chemical & Material Sciences (AREA)
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Abstract

The invention discloses a diatom ooze coating capable of degrading formaldehyde for indoor decoration, which comprises the following raw materials in percentage by weight: 15-25% of activated diatomite, 10-15% of composite photocatalyst, 3-6% of bamboo charcoal fiber, 20-30% of polyacrylic resin, 5-10% of ethylene-vinyl acetate copolymer, 2-5% of carborundum, 0.5-1.5% of dispersant and the balance of water; through mechanical extrusion mixing, the composite photocatalyst is fully loaded in the activated diatomite layer lattice, so that the particle size of the diatomite is reduced, the specific surface areas of the diatomite and the composite photocatalyst are increased, and the adsorption capacity of the diatomite is improved; and then adding the load compound and the rest raw materials of the diatom ooze coating into a stirrer, uniformly stirring to obtain the diatom ooze coating with high activity, adsorbing formaldehyde to the surface by using the diatomite, degrading the formaldehyde by using the composite photocatalyst without the assistance of extra water, degrading the formaldehyde under the indoor condition without ultraviolet light, and having high application value.

Description

Diatom ooze coating capable of degrading formaldehyde and used for interior decoration
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a diatom ooze coating capable of degrading formaldehyde for indoor decoration.
Background
It is well known that environmental pollution will induce human body to produce pathological changes. Pathogenic bacteria, PM2.5 fine particles and pathogenic and carcinogenic organic substances diffused in the living environment are attracting more and more attention, and formaldehyde, Volatile Organic Compounds (VOC), fine dust particles and toxic components generated by indoor decoration materials become the first concerns of consumers after house decoration. Wherein, formaldehyde is a colorless gas with strong pungent odor, is very volatile at room temperature, has strong stimulation effect on human skin and mucosa due to the increase of volatile amount along with the increase of temperature, can be converted into methanol in human body, and has adverse effect on optic nerve. Chronic respiratory diseases, pregnancy syndromes and newborn physique reduction are easily caused by long-term exposure to low-dose formaldehyde, and nasopharyngeal carcinoma is even caused by severe cases. High concentration formaldehyde has toxic effect on nervous system, immune system, liver, etc.
The diatom ooze coating is a high-tech novel interior wall decoration material, and the diatom ooze mainly comprises diatomite and is powdery in appearance. The diatom ooze has 5000-6000 times of small pores compared with active carbon, so that the diatom ooze has extremely strong adsorption capacity. The diatom ooze has the function of adsorbing formaldehyde by absorbing a large amount of water for assistance, slowly and continuously releasing negative oxygen ions, and being capable of effectively decomposing harmful carcinogens such as formaldehyde, toluene and the like, but under the condition that external conditions are changed, the formaldehyde is easily desorbed.
The vast majority of common semiconductor photocatalysts are n-type semiconductor materials, and the catalytic activity of the common semiconductor photocatalysts is determined by the unique energy band structure of the common semiconductor photocatalysts. Compared with insulating substances or metals, the difference is mainly that a special energy band structure exists, namely a forbidden band exists between a conduction band and a valence band. When light irradiates the surface of a semiconductor, if the energy of a photon is larger than the forbidden bandwidth of the semiconductor, the valence band electron of the semiconductor absorbs the energy emitted by the photon, then the photon jumps from the valence band with low energy to the conduction band with high energy, photo-generated electrons are sequentially generated, holes (h +) corresponding to the photo-generated electrons are left on the valence band, and finally photo-generated electron-hole pairs with high oxidation-reduction property are formed on the surface of the semiconductor catalyst. Typically, these photo-generated electron-hole pairs will interact with OH-, H2O, and O on the surface of the semiconductor catalyst2The reaction is carried out to generate high-activity hydroxyl free radicals and superoxide anions which can directly carry out chemical reaction with most organic matters adsorbed on the surface of the semiconductor catalyst, and finally, the hydroxyl free radicals and the superoxide anions are degraded into final products of water and carbon dioxide.
The common photocatalyst in the existing coating is TiO2，TiO2The photocatalyst has the limitations of 3.2eV with larger band gap energy, electrons can be excited only when ultraviolet light with the wavelength of less than 387.5nm irradiates the surface of the photocatalyst, the ultraviolet part in sunlight is less than 5 percent, and the utilization rate of indoor visible light is lower.
WO3Is an effective visible light photocatalyst, has band gap energy of 2.5-2.8eV, mainly absorbs light with the wavelength less than 443nm, has good stability and simultaneously has a wider light absorption band, WO3Can efficiently degrade organic pollutants, has little pollution to the environment and low price. And in terms of environmental purification, the method has great application value for indoor without ultraviolet light.
Disclosure of Invention
The invention aims to provide the diatom ooze coating capable of degrading formaldehyde for indoor decoration, which can degrade formaldehyde under the indoor condition without ultraviolet light and has high application value.
The technical problems to be solved by the invention are as follows:
1. the existing diatom ooze coating needs water assistance and has poor formaldehyde degradation effect in a dark room;
2. how to increase the degradation rate of indoor formaldehyde;
3. how to provide a photocatalyst with high catalytic activity.
The purpose of the invention can be realized by the following technical scheme:
a diatom ooze coating capable of degrading formaldehyde for interior decoration comprises the following raw materials in percentage by weight: 15-25% of activated diatomite, 10-15% of composite photocatalyst, 3-6% of bamboo charcoal fiber, 20-30% of polyacrylic resin, 5-10% of ethylene-vinyl acetate copolymer, 2-5% of carborundum, 0.5-1.5% of dispersant and the balance of water;
the preparation method of the diatom ooze coating comprises the following steps:
s1, mixing the activated diatomite and the composite photocatalyst, adding the mixture into a ball mill, and mixing by mechanical extrusion to obtain a load compound;
and S2, adding the load compound obtained in the step S1 and the rest raw materials of the diatom ooze coating into a stirrer, and stirring uniformly to obtain the diatom ooze coating.
Further, the preparation method of the activated diatomite comprises the following steps: adding diatomite into a ball mill, grinding and crushing, adding water to prepare a 30% diatomite solution, adding 45-50% concentrated nitric acid solution while stirring, stopping adding the concentrated nitric acid when the pH of the diatomite solution is 2.0-3.0, continuing stirring for 10-15min, measuring the pH of the diatomite solution to be 2.0-3.0 again, standing for 2-3h at 35-40 ℃, cooling to room temperature, filtering and washing to be neutral, drying filter residues, putting into a muffle furnace, calcining for 5h at 650-800 ℃, crushing and sieving with a 200-mesh sieve to obtain activated diatomite; the particle size of the activated diatomite is 12-60 nm.
Further, the composite photocatalyst is CeO2-WO3Composite fiber powder, CeO2-WO3The preparation method of the composite fiber powder comprises the following steps:
(1)CeO2preparation of spinning solution: adding cerous nitrate and ethanol into a stirrer, stirring vigorously for 30-40min, adding polyvinylpyrrolidone and dimethylformamide, stirring at room temperature for 6-8h, stopping stirring when the solution viscosity is 0.88-1.15dl/g, and obtaining CeO2Spinning solution for later use;
(2)WO3preparation of spinning solution: placing tungstic acid and ethanol into a stirrer, stirring vigorously for 30-40min, adding polyvinylpyrrolidone and dimethylformamide, stirring at room temperature for 6-8h, stopping stirring when the solution viscosity is 0.95-1.21dl/g, and obtaining WO3Spinning solution for later use;
(3) adopting coaxial electrostatic spinning technology to mix WO3The spinning solution is injected into a core layer injection pump, and the injection pump is connected with an inner needle head through a pipeline; adding CeO2The spinning solution is injected into a shell layer injection pump, and the injection pump is connected with an inner needle head through a pipeline; at an injection speed of 20-25 μ L/min, a distance from the needle tip to the receiving plate of 11-15cm, and an applied voltage of 15-18kV, WO3Spinning solution and CeO2The spinning solution is sprayed out from a nozzle at the same time and intertwined with each other to form composite fiber with a reticular structure, the composite fiber is naturally dried at room temperature, then placed in a muffle furnace, heated, calcined and naturally cooled to room temperature, and then taken out and ground to obtain CeO2-WO3And (3) composite fiber powder.
Further, the temperature rise speed in the step (3) is 2 ℃/min; the calcining temperature is 300 ℃, and the calcining time is 2 h.
Further, the CeO2-WO3The particle diameter of the composite fiber powder is 20-40nm, the specific surface area is 160-200m2Per g, pore volume of 0.165-0.211cm3/g。
Further, the dispersant is zinc stearate.
Further, the preparation method of the diatom ooze coating for interior decoration specifically comprises the following steps:
s1, mixing the activated diatomite and the composite photocatalyst, adding the mixture into a ball mill, and mixing for 4-6h through mechanical extrusion to obtain a load compound;
and S2, adding the load compound obtained in the step S1 and the rest raw materials of the diatom ooze coating into a stirrer, and stirring uniformly to obtain the diatom ooze coating.
The invention has the beneficial effects that:
(1) the invention aims to provide the diatom ooze coating for indoor decoration, which can degrade formaldehyde, wherein common diatomite is acidified and calcined, so that impurities in a diatomite structure layer are removed, pores of the diatomite are dredged, and the adsorption activity of the diatomite is improved; the activated diatomite and the composite photocatalyst are mixed and then added into a ball mill, and the composite photocatalyst is fully loaded in the activated diatomite layer lattice through mechanical extrusion mixing, so that the particle size of the diatomite is reduced, the specific surface area of the diatomite and the composite photocatalyst is increased, and the adsorption capacity of the diatomite is improved; adding the obtained load compound and the rest raw materials of the diatom ooze coating into a stirrer, and uniformly stirring to obtain the diatom ooze coating with high activity, wherein the diatom earth adsorbs formaldehyde to the surface, the composite photocatalyst degrades the formaldehyde without the assistance of extra water, the formaldehyde can be degraded under the indoor condition without ultraviolet light, the application value is high, and the problems that the existing diatom ooze coating needs water assistance and the formaldehyde degradation effect is poor in a dark room are solved;
(2) using CeO2-WO3Composite fiber photocatalyst, CeO2As oxygen storage, can pass Ce under oxidation and reduction conditions4+And Ce3+The conversion of the catalyst realizes the storage and the release of oxygen, increases the oxygen desorption amount on the surface of the catalyst, improves the degradation activity of the catalyst on formaldehyde, and improves WO by adding Ce3The degree of dispersion of (A) increases the specific surface area and pore volume of the catalyst, thereby greatly improving WO3The catalytic activity of (a); the activated diatomite and the composite photocatalyst are mechanically mixed, so that the composite photocatalyst is fully loaded in the activated diatomite layer lattice, the particle size of the diatomite is reduced, the specific surface areas of the diatomite and the composite photocatalyst are increased, the adsorption capacity of the diatomite is improved, the contact surface of the composite photocatalyst and the air is also increased, and the degradation speed of formaldehyde is improvedRate;
(3) by using coaxial electrostatic spinning techniques, WO3Spinning solution and CeO2The spinning solution is sprayed out from the nozzle and mutually twined to form the composite fiber with a reticular structure, the electrostatic spinning method has the advantages of low cost, simple operation, strong controllability, suitability for large-scale production and the like, and is a technology for efficiently preparing the composite fiber, and the prepared fiber has large specific surface area and high porosity; the addition of Ce improves WO3The degree of dispersion of (A) increases the specific surface area and pore volume of the catalyst, thereby greatly improving WO3Catalytic activity of (C), CeO2As oxygen storage, can pass Ce under oxidation and reduction conditions4+And Ce3+The conversion of the catalyst realizes the storage and the release of oxygen, increases the oxygen desorption amount on the surface of the catalyst, improves the degradation activity of the catalyst on formaldehyde and provides a photocatalyst with high activity.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A diatom ooze coating capable of degrading formaldehyde for interior decoration comprises the following raw materials (total mass is 100 kg): 15% of activated diatomite, 10% of composite photocatalyst, 3% of bamboo charcoal fiber, 20% of polyacrylic resin, 10% of ethylene-vinyl acetate copolymer, 5% of carborundum, 0.5% of zinc stearate and the balance of water;
the preparation method of the activated diatomite comprises the following steps: adding 100kg of diatomite into a ball mill, grinding and crushing, adding water to prepare a 30% diatomite solution, adding a 45% concentrated nitric acid solution while stirring, detecting that the pH of the diatomite solution is 2.5, stopping adding the concentrated nitric acid, continuing stirring for 15min, measuring the pH of the diatomite solution to be 2.6 again, standing at 35 ℃ for 3h, cooling to room temperature, filtering and washing to be neutral, drying filter residues, putting into a muffle furnace, calcining at 700 ℃ for 5h, crushing and sieving with a 200-mesh sieve to obtain activated diatomite; the particle size of the activated diatomite is 12-60 nm;
the composite photocatalyst is CeO2-WO3Composite fiber powder, CeO2-WO3The preparation method of the composite fiber powder comprises the following steps:
(1)CeO2preparation of spinning solution: 10kg of cerous nitrate and 50kg of ethanol are placed into a stirrer to be vigorously stirred for 40min, 10kg of polyvinylpyrrolidone and 50L of dimethylformamide are added, stirring is carried out for 7h at room temperature, the viscosity of the solution is detected to be 1.05dl/g, stirring is stopped, and CeO is obtained2Spinning solution for later use;
(2)WO3preparation of spinning solution: placing 10kg tungstic acid and 50kg ethanol into a stirrer, vigorously stirring for 40min, adding 10kg polyvinylpyrrolidone and 50L dimethylformamide, stirring at room temperature for 7h, detecting the solution viscosity to be 1.18dl/g, and stopping stirring to obtain WO3Spinning solution for later use;
(3) adopting coaxial electrostatic spinning technology to mix WO3The spinning solution is injected into a core layer injection pump, and the injection pump is connected with an inner needle head through a pipeline; adding CeO2The spinning solution is injected into a shell layer injection pump, and the injection pump is connected with an inner needle head through a pipeline; WO 25. mu.L/min of injection speed, 15cm of distance from the needle tip to the receiving plate, 18kV of applied voltage3Spinning solution and CeO2The spinning solution is sprayed out from a nozzle at the same time and intertwined with each other to form composite fiber with a reticular structure, the composite fiber is naturally dried at room temperature, then placed in a muffle furnace to be heated to 300 ℃ at the speed of 2 ℃/min, calcined for 2h and naturally cooled to room temperature, and then taken out and ground to obtain CeO2-WO3Composite fiber powder; CeO (CeO)2-WO3The particle diameter of the composite fiber powder is 20-40nm, the specific surface area is 160-200m2Per g, pore volume of 0.165-0.211cm3/g；
A preparation method of diatom ooze coating capable of degrading formaldehyde for indoor decoration specifically comprises the following steps:
s1, mixing the activated diatomite and the composite photocatalyst, adding the mixture into a ball mill, and mixing the mixture for 4 hours through mechanical extrusion, so that the composite photocatalyst is fully loaded in the activated diatomite layer lattice, the particle size of the diatomite is further reduced, the specific surface area of the diatomite and the composite photocatalyst is increased, and the adsorption capacity of the diatomite is improved; adsorbing formaldehyde to the surface by using diatomite, and degrading the formaldehyde by using the composite photocatalyst;
and S2, adding the load compound obtained in the step S1 and the rest raw materials of the diatom ooze coating into a stirrer, and stirring uniformly to obtain the diatom ooze coating.
Example 2
A diatom ooze coating capable of degrading formaldehyde for interior decoration comprises the following raw materials (total mass is 100 kg): 25% of activated diatomite, 10% of composite photocatalyst, 6% of bamboo charcoal fiber, 30% of polyacrylic resin, 5% of ethylene-vinyl acetate copolymer, 2% of carborundum, 0.5% of zinc stearate and the balance of water;
preparation of activated diatomaceous earth and CeO2-WO3The preparation of the composite photocatalyst is the same as that of example 1;
a preparation method of diatom ooze coating capable of degrading formaldehyde for indoor decoration specifically comprises the following steps:
s1, mixing the activated diatomite and the composite photocatalyst, adding the mixture into a ball mill, and mixing the mixture for 5 hours through mechanical extrusion, so that the composite photocatalyst is fully loaded in the activated diatomite layer lattice, the particle size of the diatomite is further reduced, the specific surface area of the diatomite and the composite photocatalyst is increased, and the adsorption capacity of the diatomite is improved; adsorbing formaldehyde to the surface by using diatomite, and degrading the formaldehyde by using the composite photocatalyst;
and S2, adding the load compound obtained in the step S1 and the rest raw materials of the diatom ooze coating into a stirrer, and stirring uniformly to obtain the diatom ooze coating.
Example 3
A diatom ooze coating capable of degrading formaldehyde for interior decoration comprises the following raw materials (total mass is 100 kg): 20% of activated diatomite, 12% of a composite photocatalyst, 5% of bamboo charcoal fiber, 25% of polyacrylic resin, 6% of ethylene-vinyl acetate copolymer, 4% of carborundum, 1% of zinc stearate and the balance of water;
preparation of activated diatomaceous earth and CeO2-WO3The preparation of the composite photocatalyst is the same as that of example 1;
a preparation method of diatom ooze coating capable of degrading formaldehyde for indoor decoration specifically comprises the following steps:
s1, mixing the activated diatomite and the composite photocatalyst, adding the mixture into a ball mill, and mixing the mixture for 6 hours through mechanical extrusion, so that the composite photocatalyst is fully loaded in the activated diatomite layer lattice, the particle size of the diatomite is further reduced, the specific surface areas of the diatomite and the composite photocatalyst are increased, and the adsorption capacity of the diatomite is improved; adsorbing formaldehyde to the surface by using diatomite, and degrading the formaldehyde by using the composite photocatalyst;
and S2, adding the load compound obtained in the step S1 and the rest raw materials of the diatom ooze coating into a stirrer, and stirring uniformly to obtain the diatom ooze coating.
Comparative example 1
A diatom ooze coating capable of degrading formaldehyde for interior decoration comprises the following raw materials (total mass is 100 kg): 20% of activated diatomite, 12% of a composite photocatalyst, 5% of bamboo charcoal fiber, 25% of polyacrylic resin, 6% of ethylene-vinyl acetate copolymer, 4% of carborundum, 1% of zinc stearate and the balance of water;
preparation of activated diatomaceous earth and CeO2-WO3The preparation of the composite photocatalyst is the same as that of example 1;
a preparation method of the diatom ooze coating capable of degrading formaldehyde for interior decoration comprises the following steps: and adding the raw materials of the diatom ooze coating into a stirrer, and uniformly stirring to obtain the diatom ooze coating.
Comparative example 2
A diatom ooze coating capable of degrading formaldehyde for interior decoration comprises the following raw materials (total mass is 100 kg): 20% of activated diatomite, 5% of bamboo charcoal fiber, 25% of polyacrylic resin, 6% of ethylene-vinyl acetate copolymer, 4% of carborundum, 1% of zinc stearate and the balance of water;
activated diatomaceous earth was prepared as in example 1;
and adding the raw materials into a stirrer, and uniformly stirring to obtain the diatom ooze coating.
The diatom ooze coating obtained from the examples 1-3 and the comparative examples 1-2 were tested for performance, and the results are shown in Table one:
TABLE I, performance test results of diatom ooze coating
Figure BDA0001719836650000091
As can be seen from the Table I, the diatom ooze coating prepared by comparative example 1 without mechanically mixing activated diatomite and the composite photocatalyst has formaldehyde removal performance inferior to that of examples 1-3, and the diatom ooze coating prepared by comparative example 2 without adding the composite photocatalyst does not reach the formaldehyde removal standard.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.

Claims (5)

1. The utility model provides a diatom ooze coating for interior decoration of degradable formaldehyde which characterized in that: the weight percentage of each raw material is as follows: 15-25% of activated diatomite, 10-15% of composite photocatalyst, 3-6% of bamboo charcoal fiber, 20-30% of polyacrylic resin, 5-10% of ethylene-vinyl acetate copolymer, 2-5% of carborundum, 0.5-1.5% of dispersant and the balance of water;
the preparation method of the activated diatomite comprises the following steps: adding diatomite into a ball mill, grinding and crushing, adding water to prepare a 30% diatomite solution, adding 45-50% concentrated nitric acid solution while stirring, stopping adding the concentrated nitric acid when the pH of the diatomite solution is 2.0-3.0, continuing stirring for 10-15min, measuring the pH of the diatomite solution to be 2.0-3.0 again, standing for 2-3h at 35-40 ℃, cooling to room temperature, filtering and washing to be neutral, drying filter residues, putting into a muffle furnace, calcining for 5h at 650-800 ℃, crushing and sieving with a 200-mesh sieve to obtain activated diatomite; the particle size of the activated diatomite is 12-60 nm;
the composite photocatalyst is CeO2-WO3Composite fiber powder, CeO2-WO3The preparation method of the composite fiber powder comprises the following steps:
(1)CeO2preparation of spinning solution: adding cerous nitrate and ethanol into a stirrer, stirring vigorously for 30-40min, adding polyvinylpyrrolidone and dimethylformamide, stirring at room temperature for 6-8h, stopping stirring when the solution viscosity is 0.88-1.15dl/g, and obtaining CeO2Spinning solution for later use;
(2)WO3preparation of spinning solution: placing tungstic acid and ethanol into a stirrer, stirring vigorously for 30-40min, adding polyvinylpyrrolidone and dimethylformamide, stirring at room temperature for 6-8h, stopping stirring when the solution viscosity is 0.95-1.21dl/g, and obtaining WO3Spinning solution for later use;
(3) adopting coaxial electrostatic spinning technology to mix WO3The spinning solution is injected into a core layer injection pump, and the injection pump is connected with an inner needle head through a pipeline; adding CeO2The spinning solution is injected into a shell layer injection pump, and the injection pump is connected with an inner needle head through a pipeline; at an injection speed of 20-25 μ L/min, a distance from the needle tip to the receiving plate of 11-15cm, and an applied voltage of 15-18kV, WO3Spinning solution and CeO2The spinning solution is sprayed out from a nozzle at the same time and intertwined with each other to form composite fiber with a reticular structure, the composite fiber is naturally dried at room temperature, then placed in a muffle furnace, heated, calcined and naturally cooled to room temperature, and then taken out and ground to obtain CeO2-WO3Composite fiber powder;
the preparation method of the diatom ooze coating comprises the following steps:
s1, mixing the activated diatomite and the composite photocatalyst, adding the mixture into a ball mill, and mixing by mechanical extrusion to obtain a load compound;
and S2, adding the load compound obtained in the step S1 and the rest raw materials of the diatom ooze coating into a stirrer, and stirring uniformly to obtain the diatom ooze coating.
2. The diatom ooze coating capable of degrading formaldehyde for interior decoration according to claim 1, wherein: the temperature rise speed in the step (3) is 2 ℃/min; the calcining temperature is 300 ℃, and the calcining time is 2 h.
3. The diatom ooze coating capable of degrading formaldehyde for interior decoration according to claim 1, wherein: the CeO2-WO3The particle diameter of the composite fiber powder is 20-40nm, the specific surface area is 160-200m2Per g, pore volume of 0.165-0.211cm3/g。
4. The diatom ooze coating capable of degrading formaldehyde for interior decoration according to claim 1, wherein: the dispersant is zinc stearate.
5. The diatom ooze coating capable of degrading formaldehyde for interior decoration according to claim 1, wherein: the preparation method of the diatom ooze coating for interior decoration specifically comprises the following steps:
s1, mixing the activated diatomite and the composite photocatalyst, adding the mixture into a ball mill, and mixing for 4-6h through mechanical extrusion to obtain a load compound;
and S2, adding the load compound obtained in the step S1 and the rest raw materials of the diatom ooze coating into a stirrer, and stirring uniformly to obtain the diatom ooze coating.
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CN110922794A (en) * 2019-12-06 2020-03-27 四川旭航新材料有限公司 Visible light photocatalytic diatom ooze coating and preparation and construction method thereof
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