CN112680108A - Silver carbon nitride formaldehyde-removing antibacterial coating and preparation method thereof - Google Patents
Silver carbon nitride formaldehyde-removing antibacterial coating and preparation method thereof Download PDFInfo
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- CN112680108A CN112680108A CN202011499870.XA CN202011499870A CN112680108A CN 112680108 A CN112680108 A CN 112680108A CN 202011499870 A CN202011499870 A CN 202011499870A CN 112680108 A CN112680108 A CN 112680108A
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Abstract
The invention relates to a silver carbon nitride formaldehyde-removing antibacterial coating which is prepared from the following raw materials: the invention relates to a preparation method of a supported silver carbon nitride nano composite solution, which comprises the following steps of preparing a two-dimensional carbon nitride material by a pyrolysis method, loading silver ions on the surface of carbon nitride, reducing the silver ions into small-size nano silver by electrons generated by the carbon nitride, preparing the supported silver carbon nitride nano composite solution, and applying the supported silver carbon nitride nano composite solution to the development of interior wall latex paint to realize the long-acting aldehyde-removing and antibacterial effects.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a silver carbon nitride formaldehyde-removing antibacterial coating and a preparation method thereof.
Background
In recent years, with the continuous development of photocatalytic technology, photocatalytic degradation has become an effective method for treating environmental pollution, i.e., effectively decomposing organic small molecules and organic pollutants and killing microorganisms under the illumination condition.
The graphite-phase carbon nitride (g-C3N4) is a nonmetal photocatalytic material with a two-dimensional layered structure, has the characteristics of large specific surface area, good thermal stability, chemical stability, high corrosion resistance and the like, and has the characteristic of photoresponse due to the narrow forbidden band width (2.7eV), so that the graphite-phase carbon nitride becomes one of popular research materials in the field of visible light catalysis. The method also has wide application prospect in the fields of pollutant photodegradation, microorganism killing and the like.
In order to improve the catalytic activity of the catalytic material and the utilization rate of visible light, on one hand, the specific surface area of the photocatalytic material can be improved, so that the surface of the material can be in full contact with the outside and has more active sites, and the catalytic activity is improved; on the other hand, the recombination rate of photo-generated electrons and holes of the photocatalytic material can be reduced by doping other elements, and visible light is more effectively utilized for catalytic reaction.
Disclosure of Invention
Technical problem to be solved
In order to solve the problems in the prior art, the invention provides a silver carbon nitride aldehyde-removing antibacterial coating and a preparation method thereof.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the silver carbon nitride formaldehyde-removing antibacterial coating comprises the following raw materials in parts by weight: 21-28 parts of water, 0.4-0.8 part of water-based dispersant, 0.1-0.3 part of pH regulator, 0.1-0.3 part of water-based wetting agent, 0.4-0.7 part of water-based defoamer, 0.1-0.2 part of preservative, 0.2-0.5 part of hydroxyethyl cellulose, 16-25 parts of titanium dioxide, 7-11 parts of calcined kaolin, 10-18 parts of calcium carbonate, 7-12 parts of talcum powder, 3-6 parts of silver carbon nitride nano composite material, 20-29 parts of emulsion, 0.8-2.0 parts of antifreeze and 0.5-1 part of film-forming additive.
Further, the silver carbon nitride nanocomposite is prepared by the following steps:
firstly, 10g of urea is placed in a ceramic crucible, covered by a cover, placed in a muffle furnace at room temperature, heated at the rate of 2-3.5 ℃/min to 450-550 ℃ from room temperature, kept for 3-5h, and then cooled to room temperature to obtain light yellow flaky carbon nitride solution;
and then, dripping 50ml of silver nitrate aqueous solution into the light yellow flaky carbon nitride solution, and stirring for 20-40min to obtain the silver carbon nitride nano composite material.
Further, the emulsion is SK-20 from Guangdong Baddy company or Wanhua
8067, either alone or in any combination of two.
A preparation method of a silver carbon nitride formaldehyde-removing antibacterial coating comprises the following specific steps:
step S1, sequentially adding water, a water-based dispersing agent, a pH regulator, a water-based wetting agent and a preservative at a rotating speed of less than 600rpm, and stirring for 3-7 min;
step S2, adding hydroxyethyl cellulose, increasing the rotation speed to 700-;
step S3, adding titanium dioxide, calcined kaolin, calcium carbonate, talcum powder and silver carbon nitride nano composite material, increasing the rotating speed to 1300-1600rpm, and dispersing for 15-22 min;
and S4, adjusting the rotation speed to 700-1000rpm, sequentially adding the emulsion, the antifreeze, the water-based defoamer and the film-forming additive, and continuously stirring for 10-15min to obtain a finished product.
(III) advantageous effects
The invention has the beneficial effects that: 1. the carbon nitride with large specific surface increases the contact area with the outside, and is beneficial to improving the efficiency of removing formaldehyde, toluene and the like.
2. The nano silver can reduce the hole-electron recombination rate of the carbon nitride, and is beneficial to improving the photocatalysis effect.
3. The average size of the nano silver is only 1.1nm, and the ultra-small size of the nano silver is beneficial to reducing the using amount of the silver and has better antibacterial effect.
4. The silver and the graphite phase carbon nitride synergistically remove aldehyde and resist bacteria.
5. The prepared functional latex paint containing silver carbon nitride has formaldehyde removing efficiency of 91.8 percent and durability of 88.4 percent; the toluene removal efficiency reaches 67.8 percent, and the durability reaches 52.8 percent; the mildew-proof effect on eight moulds such as aspergillus flavus, penicillium variotii and the like is 0 grade, and the antibacterial effect on escherichia coli and staphylococcus aureus is more than 99.9 percent.
Drawings
FIG. 1 is a transmission electron microscope image of the silver carbon nitride nanocomposite material of the present invention.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
The silver carbon nitride formaldehyde-removing antibacterial coating comprises the following raw materials in parts by weight: 21-28 parts of water, 0.4-0.8 part of water-based dispersant, 0.1-0.3 part of pH regulator, 0.1-0.3 part of water-based wetting agent, 0.4-0.7 part of water-based defoamer, 0.1-0.2 part of preservative, 0.2-0.5 part of hydroxyethyl cellulose, 16-25 parts of titanium dioxide, 7-11 parts of calcined kaolin, 10-18 parts of calcium carbonate, 7-12 parts of talcum powder, 3-6 parts of silver carbon nitride nano composite material, 20-29 parts of emulsion, 0.8-2.0 parts of antifreeze and 0.5-1 part of film-forming additive.
Further, the silver carbon nitride nanocomposite is prepared by the following steps:
firstly, 10g of urea is placed in a ceramic crucible, covered by a cover, placed in a muffle furnace at room temperature, heated at the rate of 2-3.5 ℃/min to 450-550 ℃ from room temperature, kept for 3-5h, and then cooled to room temperature to obtain light yellow flaky carbon nitride solution;
then, 50ml of silver nitrate aqueous solution is dripped into the light yellow flaky carbon nitride solution, and the mixture is stirred for 20-40min to obtain the silver carbon nitride nano composite material, as shown in figure 1, the particle size of nano silver in the carbon nitride is ultra-small, and the average particle size is 1.1 nm; the loading of silver was 0.5 wt% as quantified by ICP-MS.
Further, the emulsion is SK-20 from Guangdong Baddy company or Wanhua
8067, either alone or in any combination of two.
A preparation method of a silver carbon nitride formaldehyde-removing antibacterial coating comprises the following specific steps:
step S1, sequentially adding water, a water-based dispersing agent, a pH regulator, a water-based wetting agent and a preservative at a rotating speed of less than 600rpm, and stirring for 3-7 min;
step S2, adding hydroxyethyl cellulose, increasing the rotation speed to 700-;
step S3, adding titanium dioxide, calcined kaolin, calcium carbonate, talcum powder and silver carbon nitride nano composite material, increasing the rotating speed to 1300-1600rpm, and dispersing for 15-22 min;
and S4, adjusting the rotation speed to 700-1000rpm, sequentially adding the emulsion, the antifreeze, the water-based defoamer and the film-forming additive, and continuously stirring for 10-15min to obtain a finished product.
The aqueous wetting agent added in the invention is any one of Emulsogen LCN 407 and DOW TRITON @ CF-10 of Craine.
The aqueous antifoam agent of the invention is selected from the group consisting of cotinine
NXZ, Corning
A10 and/or Dispelair CF 246 of Blackbook.
The aqueous dispersant used in the present invention is one or both of SN5040 of nopinaceae or Dispex AA4141 of basf.
The pH regulator is Dow AMP-95.
The preservative is one or both of R-S from Thor and KSG206 from Dimei, Guangzhou.
In the invention, the film forming auxiliary agent is one or two of OE 400 or Texanol of Istman.
The emulsion in the invention is SK-20 of Guangdong Badhu or Wanhua
8067 one or both.
The titanium dioxide is one or two of BLA-200 of British Union company or R-996 of Tetrapython group.
The calcined kaolin is one or more of JYCK-60 Guangxi JYCK-95 of Jinyu Kaolin chemical Co., Ltd, and DG80 of inner Mongolia super brand building materials science and technology Co., Ltd.
The calcium carbonate is one or two of 1250-mesh coarse whiting of Jinlongdou powder Co, Ltd or T201 of Longtai powder Co, Ltd.
The first embodiment is as follows:
s1, adjusting the rotating speed to 500rpm, adding 25 parts of water, 0.4 part of hydroxyethyl cellulose, 0.5 part of water-based dispersant, 0.2 part of pH regulator and 0.2 part of water-based wetting agent;
s2, increasing the rotating speed to 1000rpm, and respectively adding 23 parts of titanium dioxide, 10 parts of calcined kaolin, 15 parts of calcium carbonate, 10 parts of talcum powder and 5 parts of silver carbon nitride nano composite material;
and S3, continuously increasing the rotating speed to 1400rpm, stirring for 20min, uniformly mixing, reducing the rotating speed to 1000rpm, continuously adding 26 parts of emulsion, 0.5 part of antifreeze, 0.8 part of film-forming additive and 0.8 part of water-based defoamer, and stirring for 15min to obtain the product.
Example two:
in step S2 of example one, the parts of the silver/carbon nitride nanocomposite were changed to 3 parts, and 2 parts of titanium dioxide were added.
Comparative example one:
in step S2 of example one, the silver carbon nitride nanocomposite was replaced with 5 parts of titanium dioxide, and the remaining steps were not changed.
The performance of the coating materials of the invention in examples 1-2 is compared with that of the coating materials of the invention in comparative example 1, and the formaldehyde and toluene purification efficiency test refers to JC/T1074-; the antibacterial and mildewproof test refers to HG/T3950 and 2007 Standard for antibacterial coatings. The data obtained are shown in table 1 below.
TABLE 1 comparison of the performance of the silver carbonitride formaldehyde-removing antibacterial coating of the present invention with that of the comparative example
Bacteria for antibacterial test, including Escherichia coli and Staphylococcus aureus; the moulds for the mildew resistance test comprise: chaetomium globosum, paecilomyces variotii, penicillium funiculosum, aspergillus niger, penicillium citrinum, trichoderma viride, aureobasidium pullulans and aspergillus flavus.
Conclusion from the above results it can be seen that: the latex paint containing the silver carbon nitride composite material not only realizes the function of removing formaldehyde and methylbenzene, but also has the effects of mildew prevention and bacteria resistance, and realizes the cleanness of indoor air environment.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (4)
1. The silver carbon nitride formaldehyde-removing antibacterial coating is characterized by comprising the following raw materials in parts by weight: 21-28 parts of water, 0.4-0.8 part of water-based dispersant, 0.1-0.3 part of pH regulator, 0.1-0.3 part of water-based wetting agent, 0.4-0.7 part of water-based defoamer, 0.1-0.2 part of preservative, 0.2-0.5 part of hydroxyethyl cellulose, 16-25 parts of titanium dioxide, 7-11 parts of calcined kaolin, 10-18 parts of calcium carbonate, 7-12 parts of talcum powder, 3-6 parts of silver carbon nitride nano composite material, 20-29 parts of emulsion, 0.8-2.0 parts of antifreeze and 0.5-1 part of film-forming additive.
2. The silver carbon nitride aldehyde-removing antibacterial coating as claimed in claim 1, wherein the silver carbon nitride nanocomposite is prepared by the following steps:
firstly, 10g of urea is placed in a ceramic crucible, covered by a cover, placed in a muffle furnace at room temperature, heated at the rate of 2-3.5 ℃/min to 450-550 ℃ from room temperature, kept for 3-5h, and then cooled to room temperature to obtain light yellow flaky carbon nitride solution;
and then, dripping 50ml of silver nitrate aqueous solution into the light yellow flaky carbon nitride solution, and stirring for 20-40min to obtain the silver carbon nitride nano composite material.
3. The silver carbon nitride aldehyde-removing antibacterial coating as claimed in claim 1, wherein the emulsion is SK-20 from Guangdong Baddy company or Vanhua
8067, either alone or in any combination of two.
4. A method for preparing the silver carbon nitride formaldehyde-removing antibacterial coating as claimed in any one of claims 1 to 3, which is characterized by comprising the following specific steps:
step S1, sequentially adding water, a water-based dispersing agent, a pH regulator, a water-based wetting agent and a preservative at a rotating speed of less than 600rpm, and stirring for 3-7 min;
step S2, adding hydroxyethyl cellulose, increasing the rotation speed to 700-;
step S3, adding titanium dioxide, calcined kaolin, calcium carbonate, talcum powder and silver carbon nitride nano composite material, increasing the rotating speed to 1300-1600rpm, and dispersing for 15-22 min;
and S4, adjusting the rotation speed to 700-1000rpm, sequentially adding the emulsion, the antifreeze, the water-based defoamer and the film-forming additive, and continuously stirring for 10-15min to obtain a finished product.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113881269A (en) * | 2021-11-08 | 2022-01-04 | 福建省三棵树新材料有限公司 | Copper carbon nitride nano composite material, application thereof in paint and preparation method thereof |
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