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CN-122011823-A - All-weather carbon nano dot-based self-cleaning coating and application

CN122011823ACN 122011823 ACN122011823 ACN 122011823ACN-122011823-A

Abstract

The invention relates to the technical field of special functional coating materials. More particularly, to an all-weather carbon nano dot-based self-cleaning coating and application. The self-cleaning coating comprises the following raw material components of a main coating and a carbon nano dot aqueous solution serving as a coating additive, wherein the carbon nano dot aqueous solution is prepared by the following steps of 1) adding an auxiliary agent solution into a high polymer to obtain a precursor solution, 2) transferring the precursor solution into a reactor, reacting for 1-24 hours at a temperature of 100-500 ℃, 3) cooling to room temperature after the reaction is finished, collecting a reaction solution, and separating and purifying to obtain the high polymer. The coating utilizes the inherent antibacterial property of the carbon nano dots and the property of generating active oxygen by photosensitization, realizes stable sterilization and disinfection in a bright or dark environment and efficiently degrades formaldehyde in bright conditions, can be widely applied to the fields of construction, medical treatment, food processing, transportation and the like, and has important industrial application value.

Inventors

  • GE JIECHAO
  • HAO YONGLIANG
  • CHEN TIEJIN
  • ZHANG TIERUI
  • ZHOU CHAO

Assignees

  • 中国科学院理化技术研究所

Dates

Publication Date
20260512
Application Date
20260204

Claims (10)

  1. 1. The all-weather carbon nano dot-based self-cleaning coating is characterized by comprising the following raw material components of main coating and carbon nano dot aqueous solution serving as a coating additive; wherein, the carbon nano dot aqueous solution is prepared according to the following steps: 1) Adding an auxiliary agent solution into a high-molecular polymer to obtain a precursor solution; 2) Transferring the precursor solution into a reactor, and reacting for 1-24 hours at 100-500 ℃; 3) Cooling to room temperature after the reaction is finished, collecting a reaction solution, and separating and purifying to obtain the carbon nano dot aqueous solution; the high molecular polymer is selected from the following structures: ; m and n are natural numbers of 0-10000, and m and n are not 0 at the same time; Ar 1 is selected from benzene, naphthalene, anthracene, pyrene, indole, thiophene, carbazole, rhodamine, fluorene, quinoline, cyano dye, pyrrole, coumarin, fluorescein, or carbazole; x, Y are each independently selected from O, S, se, N or Si; Z, R 1 、R 2 、R 3 、R 4 are each independently selected from hydrogen, alkyl groups having 1 to 18 carbon atoms, hydroxyl groups, mercapto groups, carboxyl groups, amino groups, amide groups, cyano groups, alkenyl groups, alkynyl groups, aryl groups, ester groups, ether groups, quaternary ammonium salts, sulfonate groups, phosphate groups, or polyethylene glycol groups.
  2. 2. Self-cleaning coating according to claim 1, characterized in that the mass concentration of the aqueous carbon nanodot solution is 1-5%o; preferably, the mass ratio of the carbon nano dots to the main coating is 1:5000-8000.
  3. 3. The self-cleaning coating of claim 1, wherein the body coating comprises one of an aqueous acrylic coating, a polyurethane coating, an epoxy coating, a fluorocarbon coating.
  4. 4. Self-cleaning coating according to claim 1, characterized in that the high molecular polymer is selected from the following structures: 1) PT1, n is an integer of 3-3000; 2) CPT1, m is an integer from 3 to 3000, n is an integer from 3 to 750; 3) CPT2, m is an integer from 3 to 1000, n is an integer from 3 to 5000; 4) PT2 and n are integers of 3-3000.
  5. 5. Self-cleaning coating according to claim 1, characterized in that the high molecular polymer has a number average molecular weight of 10 4 -10 5 Da and a light absorption range of 400-800nm.
  6. 6. Self-cleaning coating according to claim 1, characterized in that it is prepared according to the following steps: Stirring and mixing the main body coating and the carbon nano dot aqueous solution uniformly, then coating the main body coating on the surface of a substrate, and curing and forming to obtain a self-cleaning coating; preferably, the substrate is selected from one of metal, glass, ceramic, wood, concrete, plastic; preferably, the self-cleaning coating has a thickness of 20-300 μm.
  7. 7. Use of a self-cleaning coating according to any one of claims 1-6 for killing harmful pathogenic microorganisms or degrading toxic harmful gases under light and in the protection from light.
  8. 8. The method according to claim 7, wherein the application further comprises applying a system comprising bacteria, fungi or viruses to the surface of the self-cleaning coating, wherein the killing of bacteria, fungi or viruses is accomplished under irradiation with visible light, wherein the intensity of the visible light is between 5 and 80mW/cm 2 and the irradiation time is between 0.5 and 24 hours.
  9. 9. The use according to claim 7, further comprising placing the self-cleaning coating in a formaldehyde-containing enclosure, wherein degradation of formaldehyde is achieved after a period of irradiation with visible light; Preferably, the application further comprises placing the self-cleaning coating of 0.25m 2 in a closed space of 1m 3 , wherein the initial concentration of formaldehyde in the closed space is 1.0mg/m 3 , irradiating the self-cleaning coating with visible light, and the formaldehyde degradation rate is more than 80%; Preferably, the intensity of the visible light irradiation is 5-80mW/cm 2 , and the irradiation time is 0.5-24 hours.
  10. 10. The method according to claim 7, wherein the application further comprises applying a system comprising bacteria, fungi or viruses to the surface of the self-cleaning coating and incubating the surface in the absence of light to effect the killing of the bacteria, fungi or viruses, wherein the incubation time is between 6 and 24 hours.

Description

All-weather carbon nano dot-based self-cleaning coating and application Technical Field The invention relates to the technical field of special functional coating materials. More particularly, to an all-weather carbon nano dot-based self-cleaning coating and application. Background With the continuous improvement of the requirements of people on environmental sanitation and air quality, the demands of the coating materials with self-cleaning functions such as sterilization, disinfection, pollutant degradation and the like in the fields of building decoration, medical environment, food processing, livestock and aquaculture and transportation are increasingly urgent. At present, commercial self-cleaning coatings are mostly prepared based on photocatalytic materials (such as titanium dioxide, zinc oxide and the like), but have obvious limitations that firstly, the function implementation depends on illumination, the sterilization and self-cleaning effects cannot be exerted in a dark environment, and secondly, most of the coatings only have a single function, and the synergistic effect of sterilization and disinfection and harmful gas degradation is difficult to realize at the same time. The carbon nano-dot is used as a novel zero-dimensional carbon-based nano-material and has the excellent characteristics of small size (usually less than 100 nm), high chemical stability, good biocompatibility, low toxicity and the like. It is found that some carbon nano-dots can generate Reactive Oxygen Species (ROS) through photoinduction energy or electron transfer under the condition of light to realize pollutant degradation, sterilization and degradation of toxic and harmful gases, and under the condition of no light, some carbon nano-dots can damage bacterial cell membranes through electrostatic interaction of surface functional groups and bacterial surfaces to achieve a sterilization effect. However, at present, carbon nanodots with pollutant degradation, sterilization and degradation of toxic and harmful gases have not been reported under all-weather conditions. Further, the market of commercial coating products with all-weather sterilization and formaldehyde photodegradation functions based on the carbon nanodots as an auxiliary agent is still blank. Therefore, the carbon nano dot-based self-cleaning coating which has simple process and strong compatibility, can stably play a role in sterilization and disinfection under the condition of light or no light, can efficiently degrade formaldehyde under the condition of light and has important market value is developed. Disclosure of Invention Based on the above drawbacks, a first object of the present invention is to provide an all-weather carbon nanodot-based self-cleaning coating. A second object of the present invention is to provide a use of a self-cleaning coating as described above for killing harmful pathogenic microorganisms or degrading toxic harmful gases under light or in the absence of light. In order to achieve the first object, the present invention adopts the following technical scheme: The invention discloses an all-weather carbon nano dot-based self-cleaning coating, which is formed by the following raw material components of main coating and carbon nano dot aqueous solution serving as a coating additive; wherein, the carbon nano dot aqueous solution is prepared according to the following steps: 1) Adding an auxiliary agent solution into a high-molecular polymer to obtain a precursor solution; 2) Transferring the precursor solution into a reactor, and reacting for 1-24 hours at 100-500 ℃; 3) Cooling to room temperature after the reaction is finished, collecting a reaction solution, and separating and purifying to obtain the carbon nano dot aqueous solution; the high molecular polymer is selected from the following structures: ; m and n are natural numbers of 0-10000, and m and n are not 0 at the same time; Ar 1 is selected from benzene, naphthalene, anthracene, pyrene, indole, thiophene, carbazole, rhodamine, fluorene, quinoline, cyano dye, pyrrole, coumarin, fluorescein, or carbazole; x, Y are each independently selected from O, S, se, N or Si; Z, R 1、R2、R3、R4 are each independently selected from hydrogen, alkyl groups having 1 to 18 carbon atoms, hydroxyl groups, mercapto groups, carboxyl groups, amino groups, amide groups, cyano groups, alkenyl groups, alkynyl groups, aryl groups, ester groups, ether groups, quaternary ammonium salts, sulfonate groups, phosphate groups, or polyethylene glycol groups. According to the invention, a high molecular polymer is used as a functional precursor, a hydrothermal carbonization technology is combined to prepare the carbon nano-dots with antibacterial property and active oxygen generating property by photosensitization, and then the carbon nano-dots are added into a paint formula according to a certain proportion, so that the formed self-cleaning coating realizes stable sterilization and disinfection (the bacteriostas