CN115920092A - Chemical disinfection coupling ultraviolet and photocatalysis cold chain outer package composite disinfection method - Google Patents
Chemical disinfection coupling ultraviolet and photocatalysis cold chain outer package composite disinfection method Download PDFInfo
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Abstract
The invention discloses a chemical disinfection coupling ultraviolet and photocatalytic cold chain outer packaging compound disinfection method, wherein a low-temperature chemical disinfectant is one or more of sodium dichloroisocyanurate chlorine-containing disinfectants, quaternary ammonium salt disinfectants and hydrogen peroxide; the use concentration of the sodium dichloroisocyanurate chlorine-containing disinfectant is not less than 500mg/L; the use concentration of the quaternary ammonium salt disinfectant is not lower than 80mg/L; the using concentration of the hydrogen peroxide is not lower than 80mg/L. A large number of experiments effectively prove that the coupling synergy of the three disinfection technologies can be used as a safe, green, efficient, quick and low-cost cold chain outer package disinfection technology, so that the metering of the chemical disinfectant for low-temperature disinfection is greatly reduced, the harm to people is reduced, and the environmental burden is reduced.
Description
Technical Field
The invention relates to the technical field of public health, in particular to a cold chain product outer package disinfection method based on chemical disinfection and ultraviolet disinfection coupling photocatalysis disinfection.
Background
At present, in the first-station refrigeration house, particularly in the refrigeration house in the north in winter, the low-temperature disinfection effect is poor, the efficiency is low, the dosage of chemical disinfectants is large, the environmental pollution is large, and particularly, the problems that disinfection personnel and carrying personnel are often allergic and sometimes have injury are serious. The development of a low-temperature disinfection technology with safety, greenness, high efficiency, quickness and low cost for cold-chain external packaging is urgently needed.
The two low-temperature disinfectants recommended by the comprehensive group have the main components of sodium dichloroisocyanurate which reacts with water to release one molecule of hypochlorous acid and one molecule of sodium hypochlorite, and the neutral small-molecule hypochlorous acid can penetrate through the cell wall of bacteria to oxidize the virus protein shell, thereby playing the role of killing microorganisms. However, as can be seen from the Arrhenius equation, the hydrolysis reaction rate decreases exponentially with decreasing temperature under low temperature conditions, and the disinfection efficacy decreases significantly, resulting in resistance to pathogens being exposed to concentrations of the disinfection solution of sub-lethal amounts for a long time. In order to ensure the sterilization effect of the disinfectant, the content of active ingredients needs to be increased, namely the content of active chlorine is increased from 500mg/L under the normal temperature condition to 3000mg/L under the low-temperature environment of 18 ℃ below zero, and the recommended dosage is 200-300mL/m 2 . Because the chlorine-containing disinfectant has strong pungent smell and contains a large amount of salt and ethanol, the spraying with high concentration and large dosage can generate great harm to workers and environmental equipment, so that the disinfection of cold chain products, especially the fields of food, medicine, chemical industry and the like, has urgent need of a disinfectant which can still keep liquid state at low temperature for spraying disinfection and has effective disinfection effect verification, good stability, high activity, low toxicity and little pollution in low temperature environment.
The application of traditional chemical disinfection in cold chain disinfection work has certain limitation, and other physical disinfection En disinfection means are required to be introduced to perform coupling action with the chemical disinfection. In an article investigating the disinfection effect of SARS-CoV by UV light, the authors mention (Biomed Environ Sci.2003Sep;16 (3): 246-55.) that UV doses in excess of 162000. Mu.W.s/cm were required to eradicate the coronavirus 2 In the commercially available 30W,90 μ W/cm 2 Ultraviolet lampFor example, irradiation at a distance of 1m takes 30 minutes to kill the virus. The photocatalytic disinfection technology is to generate active components such as hydroxyl radicals with strong oxidizing property under the irradiation of ultraviolet light to a photocatalyst so as to destroy the structure of biological cells, thereby achieving the purpose of killing microorganisms. Hydroxyl radicals can disrupt the biological permeability barrier of microorganisms, destroy proteins, enzymes and nucleic acids of pathogenic microorganisms, and cause death of pathogenic microorganisms. It has now been demonstrated that photocatalysts such as TiO 2 Can cause serious damage to molecules such as amino acid, DNA and the like under the condition of ultraviolet irradiation. However, the ultraviolet light disinfection and photocatalytic disinfection methods have long disinfection time and are not suitable for quick disinfection of the outer package of cold chain products.
Aiming at the severe situation faced by cold chain product enterprise epidemic prevention and the existing cold chain food chemical disinfection technology of the first station fixed point refrigeration house, which has the disadvantages of poor disinfection effect, low efficiency, large dosage of chemical disinfectant and large environmental pollution, the development of the low-temperature disinfection technology with safe, green, efficient, rapid and low cost of cold chain outer packaging is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention couples a low-temperature chemical disinfection technology with an ultraviolet and photocatalyst physical disinfection mechanism, verifies the disinfection effect of two indicator bacteria of escherichia coli and staphylococcus aureus, effectively proves that the coupling synergy of the three low-temperature disinfection technologies can be used as a safe, green, efficient, quick and low-cost cold chain outer package disinfection technology, and greatly reduces the metering of the low-temperature disinfection chemical disinfectant, the harm to people and the environmental burden.
A chemical disinfection coupling ultraviolet and photocatalysis cold chain outer packaging compound disinfection method is used in the environment of more than or equal to minus 20 ℃, the method is that a low-temperature chemical disinfectant is sprayed on the outer surface of an article through atomization, and ultraviolet rays and active oxygen species (including hydroxyl free radicals, superoxide anion free radicals, singlet oxygen, hydroxyl anion free radicals and ozone) generated by an ultraviolet lamp and a photocatalyst plate bonding assembly perform ultraviolet disinfection and photocatalysis disinfection on the outer surface of the article, so that the compound disinfection method for the chemical disinfection coupling ultraviolet disinfection and photocatalysis disinfection on the surface of the article is realized; the coupling of the three disinfection technologies has a synergistic effect on the killing of microorganisms.
For the above technical solution, preferably, the low-temperature chemical disinfectant is one or more selected from sodium dichloroisocyanurate-type chlorine-containing disinfectants, quaternary ammonium salt disinfectants and hydrogen peroxide, and is atomized and sprayed for use.
For the technical scheme, preferably, the use concentration of the sodium dichloroisocyanurate chlorine-containing disinfectant is more than or equal to 500mg/L; the use concentration of the quaternary ammonium salt disinfectant is more than or equal to 80mg/L; the using concentration of the hydrogen peroxide is more than or equal to 80mg/L.
For the technical scheme, preferably, the concentration of the sodium dichloroisocyanurate chlorine-containing disinfectant is 500-5000mg/L; the use concentration of the quaternary ammonium salt disinfectant is 100-5000mg/L; the hydrogen peroxide has the use concentration of 150-50000mg/L. In the embodiment of the sodium dichloroisocyanurate chlorine-containing disinfectant, dichloroisocyanuric acid is used, and the concentration is 500-3000mg/L; in the quaternary ammonium salt disinfectant, benzalkonium chloride and didecyl dimethyl ammonium chloride 7 are mixed according to the mass ratio, and the concentration is 80-220mg/L; the using concentration of the hydrogen peroxide is 80-270mg/L, and more preferably 100-270mg/L; the photocatalysis plate is a phenolic resin plate coated with fluorocarbon resin, and the photocatalyst is g-C 3 N 4 And TiO 2 2 The mass ratio is 7 2 。
For the above technical solution, preferably, the wavelength of the ultraviolet light is 190nm to 290nm; the intensity of ultraviolet light irradiating on the outer surface of the article is more than or equal to 1500 muW/cm.
For the above technical solution, preferably, in the ultraviolet light and photocatalyst plate bonding assembly, the ultraviolet lamp set is installed above the photocatalyst plate coated with the photocatalyst coating; the photocatalytic substrate generates active oxygen species (including hydroxyl free radicals, superoxide anion free radicals, singlet oxygen, hydroxyl anion free radicals, ozone, hydrogen peroxide and the like) under the irradiation of ultraviolet light of 190-290 nm.
For the above technical solution, preferably, the photocatalyst is at least one of graphite phase carbon nitride, titanium dioxide, or a composite photocatalyst of graphite phase carbon nitride and titanium dioxide.
For the above technical solution, preferably, the photocatalyst is a composite photocatalyst of graphite-phase carbon nitride and titanium dioxide, and the mass ratio of the composite photocatalyst is in a range from 8. Preferably, g to C in step (1) 3 N 4 And TiO 2 The weight ratio is 7 (3-11). When g-C 3 N 4 And TiO 2 The composite photocatalyst obtained when the weight ratio is 7 (3-11) has higher capability of generating active oxygen; most preferably, when g-C 3 N 4 And TiO 2 And when the weight ratio is 7.
For the above technical solution, preferably, in the cold chain outer packaging composite sterilization method, the preparation method of the photocatalyst plate is as follows:
(1) weighing graphite phases g-C according to a mass ratio of 2 3 N 4 And TiO 2 2 Mixing uniformly to obtain the photocatalyst;
(2) coating at least one of fluorocarbon resin, epoxy resin, acrylic resin, unsaturated resin and polyurethane resin on a substrate plate, and coating the substrate plate with the thickness of 1-3mm to obtain substrate plate resin; the base plate is selected from one of polyvinyl chloride, polyethylene, polypropylene, unsaturated resin, polyurethane, phenolic resin and bakelite;
(3) the photocatalyst prepared in the step (1) is prepared according to the proportion of 20-300 g/m 2 And (3) uniformly coating the upper surface of the resin of the substrate plate prepared in the step (2), and curing to prepare the photocatalyst plate of the photocatalyst.
For the above-mentioned technical solution, preferably, the amount of the coating photocatalyst is 180-220g/m 2 。
With respect to the above technical solution, preferably, in the step (3), the photocatalyst prepared in the step (1) is 100-260 g/m 2 And (3) uniformly coating the upper surface of the resin of the substrate plate prepared in the step (2).
With respect to the above-mentioned technical solution, it is preferable that saidG to C in step (1) 3 N 4 And TiO 2 The weight ratio is 7 (3-11);
the invention has the beneficial effects that:
the invention is a interdisciplinary study in the fields of sanitation, chemical industry, food safety and the like, develops research aiming at a new coronavirus prevention and control sterilization technology of cold chain food of a cold storage warehouse at a first station and a fixed point, forms processes and specifications of chemical sterilization and physical sterilization by researching a synergistic action mechanism of the chemical sterilization and the physical sterilization, and establishes an optimal dosage specification; the unique accepted disinfection mode, namely chemical disinfection, is used, and the ultraviolet and photocatalytic disinfection technology is coupled for synergism, so that the disinfection problem of the outer package of the cold chain product can be effectively solved, and a new thought and technical support are provided for safe, green, efficient, quick and low-cost cold chain disinfection.
Drawings
FIG. 1 shows the inactivation rate of chlorine-containing disinfectant after disinfection under different disinfection processes; wherein: a and B respectively represent the relationship between the dosage and the inactivation rate of different disinfection modes.
FIG. 2 shows the post-sterilization inactivation rates of quaternary ammonium salt disinfectants under different sterilization processes; wherein: a and B respectively represent the relationship between the dosage and the inactivation rate of different disinfection modes.
FIG. 3 shows the post-sterilization inactivation rates of hydrogen peroxide disinfectants in different sterilization processes; wherein: a and B respectively represent the relationship between the dosage and the extinction rate of different disinfection modes.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiments.
Example 1
The detachable photocatalytic plates are arranged on the left, right, lower and side four surfaces of the experimental device, and the area is 1350cm 2 An ultraviolet lamp with a 254nm wave band is arranged above the experimental device, the distance is adjustable, and the intensity of irradiating the sample is more than or equal to 1500 mu W/cm 2 The chemical disinfectant atomizer was mounted on the top, the sample was placed at the bottom of the prototype chamber, and the ambient temperature used in the following examples was-18 ℃.
The photocatalysis board is a phenolic resin board coated with fluorocarbon resin,the photocatalyst is g-C 3 N 4 And TiO 2 The ratio was 7 2 。
Test pieces (tryptone soy broth medium as organic interfering substance in evaluation of low-temperature on-site disinfection effect) were prepared according to GB/T38502, and the number of recovered bacteria per E.coli (8099) piece was 2.41X 10 6 CFU/tablet, staphylococcus aureus (ATCC 6538) 2.59X 10 6 CFU/piece, and selecting cloth piece (1 cm × 1 cm) as the carrier for the contamination.
Using low-temperature dichloroisocyanuric acid disinfectant, 3000mg/L, atomizing and continuously spraying to the infected cotton piece in the device, continuously spraying under the ultraviolet irradiation, and spraying with unit area metering of 28g/m 2 And then, taking out the infected cotton piece for 20s, disinfecting, standing for 10 minutes, and respectively evaluating the killing rate of the staphylococcus aureus and the escherichia coli, wherein the killing rate is 100 percent.
And (3) evaluating the disinfection effect, namely moving the bacterial sheet into a test tube filled with 5.0mL of corresponding neutralizer by using sterile forceps, vibrating for 80 times at the palm or uniformly mixing by using a uniformly mixer, neutralizing for 10min, and simultaneously establishing a positive control group. In the low-temperature disinfection experiment, the positive control group and the test group are put into corresponding low-temperature environment together, and are put into the diluent for counting after reaching the same low temperature. Oscillating the sampling tube on a mixer for 20s or shaking forcefully for 80 times, sucking 1.0mL of sample to be detected, inoculating the sample to two sterile plates, inoculating each sample to two plates in parallel, adding 15-18 mL of dissolved culture medium (corresponding culture medium) at 45-48 ℃, shaking up while pouring, after agar is solidified, placing at 36 +/-1 ℃ for culturing for 48h (special indication microorganisms are cultured according to corresponding requirements), counting the number of bacterial colonies and calculating the killing rate.
In the formula:
x-kill (%);
a-the pre-sterilization bacterial load or the recovery bacterial load of the positive control group (CFU/sample);
b-post-sterilization bacterial load or test group recovery bacterial load (CFU/sample).
Using low-temperature dichloroisocyanuric acid disinfectant (3000 mg/L), atomizing, continuously spraying onto the infected cotton piece in the device, and continuously spraying under ultraviolet irradiation, wherein the spraying unit area is 28g/m 2 And then, taking out the infected cotton piece for 20s, disinfecting, standing for 10 minutes, and respectively evaluating the killing rate of the staphylococcus aureus and the escherichia coli by 100%.
Examples 2 to 5
The same procedure as in example 1 was followed and the disinfection evaluation method was the same except that the following adjustments were made to the disinfectant concentration.
As shown in the above table, at a temperature of-18 ℃, the concentration of the sodium dichloroisocyanurate disinfectant is 500-2000mg/L, especially 1000-2000mg/L; and the 254nm ultraviolet disinfection intensity is more than or equal to 1500 mu W/cm 2 Acting for 20 s; and the photocatalytic area is 200g/m 2 The acting time is 20 s; continuously spraying under ultraviolet irradiation, wherein the unit area of the spray is 28g/m 2 Under the latter condition, the killing efficiency of the microorganism is 94 to 100 percent.
Comparative examples 1 to 11
The same experimental procedures as in examples 2-5, the same disinfection evaluation method, and the absence of control of UV disinfection or photocatalytic disinfection at different concentrations of sodium dichloroisocyanurate disinfectant.
Examples 6 to 10
The detachable photocatalysis plate is arranged on the left, right, lower and side four sides of the experimental device, and the area is 1100cm 2 An ultraviolet lamp with a 254nm wave band is arranged above the experimental device, the distance is adjustable, and the intensity of irradiating a sample is not lower than 1500 mu W/cm 2 The chemical disinfectant atomizer was mounted on the top, the sample was placed in the bottom of the prototype chamber, and the ambient temperature used in the following examples was-18 ℃.
The photocatalysis board is coated with bakelite boardFluorocarbon resin coated with photocatalyst g-C 3 N 4 And TiO 2 The ratio was 8 2 。
Test pieces (tryptone soy broth medium as organic interfering substance in evaluation of low-temperature on-site disinfection effect) were prepared according to GB/T38502, and the number of recovered bacteria per E.coli (8099) piece was 2.41X 10 6 CFU/tablet, staphylococcus aureus (ATCC 6538) 2.59X 10 6 CFU/piece, and selecting cloth piece (1 cm × 1 cm) as the carrier for the contamination.
And (3) evaluating the disinfection effect, namely moving the bacterial sheet into a test tube filled with 5.0mL of corresponding neutralizer by using sterile forceps, vibrating for 80 times at the palm or uniformly mixing by using a uniformly mixer, neutralizing for 10min, and simultaneously establishing a positive control group. In the low-temperature disinfection experiment, the positive control group and the test group are put into corresponding low-temperature environment together, and are put into the diluent for counting after reaching the same low temperature. Oscillating the sampling tube on a mixer for 20s or shaking forcefully for 80 times, sucking 1.0mL of sample to be detected, inoculating the sample to two sterile plates, inoculating each sample to two plates in parallel, adding 15-18 mL of dissolved culture medium (corresponding culture medium) at 45-48 ℃, shaking up while pouring, after agar is solidified, placing at 36 +/-1 ℃ for culturing for 48h (special indication microorganisms are cultured according to corresponding requirements), counting the number of bacterial colonies and calculating the killing rate.
In the formula:
x-kill (%);
a-bacterial count before sterilization or recovered bacterial count for positive control group (CFU/sample);
b-post-sterilization bacterial load or test group recovery bacterial load (CFU/sample).
The disinfectant is prepared by spraying 220mg/L disinfectant with low-temperature quaternary ammonium salt (benzalkonium chloride and didecyldimethyl ammonium chloride 7) 2 Then taking out the cotton piece with the bacteria for disinfection and standing for 15 minutes after 20 seconds, respectively evaluating the disinfection and the killing of the staphylococcus aureus and the escherichia coli,the killing rate is 100 percent.
Comparative examples 12 to 18
The same experimental procedure as in examples 6-10, and the same disinfection evaluation method, with different low temperature quaternary ammonium salt (benzalkonium chloride and didecyldimethyl ammonium chloride 7) disinfectant concentrations, lack control of uv or photocatalytic disinfection efficacy.
Examples 11 to 14
The detachable photocatalytic plates are arranged on the left, right, lower and side four surfaces of the experimental device, and the area is 1350cm 2 The ultraviolet lamp with a 254nm wave band is adopted above the experimental device, the distance is adjustable, and the intensity of irradiating the sample is not lower than 1500 muW/cm 2 The chemical disinfectant atomizing nozzle is installed at the top part, the plastic spraying is adjustable, a sample is placed at the bottom of the cavity of the prototype, and the environment temperature used in the following embodiments is-18 ℃.
The photocatalysis board is a bakelite board coated with fluorocarbon resin, and the photocatalyst is g-C 3 N 4 And TiO 2 The ratio was 6 2 。
Test pieces (tryptone soy broth medium was used as an organic interfering substance when evaluating the disinfection effect in the field at low temperature) were prepared according to GB/T38502, and the number of recovered bacteria per E.coli (8099) piece was 2.41X 10 6 CFU/tablet, staphylococcus aureus (ATCC 6538) 2.59X 10 6 CFU/piece, and selecting cloth piece (1 cm × 1 cm) as the carrier for the contamination.
Low-temperature hydrogen peroxide disinfectant 270mg/L is atomized and sprayed continuously onto the infected cotton piece in the device, and the atomized cotton piece is sprayed under ultraviolet irradiation with the amount of 32g/m in unit area 2 And then, taking out the infected cotton piece for 20s, disinfecting, standing for 15 minutes, and respectively evaluating the killing rate of the staphylococcus aureus and the escherichia coli, wherein the killing rate is 100 percent.
And (3) evaluating the disinfection effect, namely moving the bacterial tablets into a test tube filled with 5.0mL of corresponding neutralizer by using sterile forceps, beating the palm of the hand 80 times or uniformly mixing by using a mixer, neutralizing for 10min, and simultaneously establishing a positive control group. In the low-temperature disinfection experiment, the positive control group and the test group are put into corresponding low-temperature environment together, and are put into the diluent for counting after reaching the same low temperature. Oscillating the sampling tube on a mixer for 20s or shaking forcefully for 80 times, sucking 1.0mL of sample to be detected, inoculating the sample to two sterile plates, inoculating each sample to two plates in parallel, adding 15-18 mL of dissolved culture medium (corresponding culture medium) at 45-48 ℃, shaking up while pouring, after agar is solidified, placing at 36 +/-1 ℃ for culturing for 48h (special indication microorganisms are cultured according to corresponding requirements), counting the number of bacterial colonies and calculating the killing rate.
In the formula:
x-kill (%);
a-bacterial count before sterilization or recovered bacterial count for positive control group (CFU/sample);
b-post-sterilization bacterial load or test group recovery bacterial load (CFU/sample).
Comparative examples 22 to 31
The experimental operation was the same as in examples 11-14, the disinfection evaluation method was the same, and the control of the ultraviolet disinfection or photocatalytic disinfection effect was absent at different low temperature hydrogen peroxide disinfectant concentrations.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A chemical disinfection coupling ultraviolet and photocatalysis cold chain outer packaging compound disinfection method is characterized in that the method is used in the environment with the temperature of more than or equal to-20 ℃, a low-temperature chemical disinfectant is sprayed on the outer surface of an article through atomization, and ultraviolet rays and active oxygen species (including hydroxyl free radicals, superoxide anion free radicals, singlet oxygen, hydroxyl anion free radicals and ozone) generated by an ultraviolet lamp and a photocatalyst plate bonding assembly are used for carrying out ultraviolet disinfection and photocatalysis disinfection on the outer surface of the article, so that the compound disinfection method for the chemical disinfection coupling ultraviolet disinfection and photocatalysis disinfection on the surface of the article is realized; the coupling of the three disinfection technologies has a synergistic effect on the killing of microorganisms.
2. The cold chain outer packaging compound disinfection method as claimed in claim 1, wherein the low temperature chemical disinfectant is one or more selected from sodium dichloroisocyanurate chlorine-containing disinfectants, quaternary ammonium salt disinfectants, and hydrogen peroxide, and is atomized and sprayed for use.
3. The cold chain outer package composite disinfection method as claimed in claim 1, wherein the concentration of said sodium dichloroisocyanurate disinfectant containing chlorine is more than or equal to 500mg/L; the use concentration of the quaternary ammonium salt disinfectant is more than or equal to 80mg/L; the using concentration of the hydrogen peroxide is more than or equal to 80mg/L.
4. The composite disinfection method for the cold chain outer package according to claim 3, wherein the concentration of the sodium dichloroisocyanurate disinfectant containing chlorine is 500-5000mg/L; the use concentration of the quaternary ammonium salt disinfectant is 100-5000mg/L; the using concentration of the hydrogen peroxide is more than or equal to 140-50000mg/L.
5. The composite disinfection method for the cold chain external packing according to claim 1, wherein the wavelength of the ultraviolet light is 190nm to 290nm; the intensity of ultraviolet light irradiating on the outer surface of the article is more than or equal to 1500 mu W/cm.
6. The cold chain outer packaging composite sterilization method according to claim 1, wherein the ultraviolet light and photocatalyst plate bonding assembly is characterized in that an ultraviolet lamp group is installed above a photocatalyst plate coated with a photocatalyst coating; the photocatalytic substrate generates active oxygen species (including hydroxyl free radicals, superoxide anion free radicals, singlet oxygen, hydroxyl anion free radicals, ozone and hydrogen peroxide) under the irradiation of ultraviolet light of 190-290 nm.
7. The cold chain overwrap composite sterilization method of claim 1, wherein said photocatalyst is at least one of graphite phase carbon nitride, titanium dioxide or a composite photocatalyst of graphite phase carbon nitride and titanium dioxide.
8. The cold chain outer packaging composite disinfection method as claimed in claim 7, wherein the photocatalyst is a composite photocatalyst of graphite phase carbon nitride and titanium dioxide, and the mass ratio range of the photocatalyst is 8.
9. The cold chain outer packaging composite disinfection method as claimed in claim 1, wherein the preparation method of the photocatalyst plate is as follows:
(1) weighing graphite phases g-C according to the mass ratio of 2 3 N 4 And TiO 2 Mixing uniformly to obtain the photocatalyst;
(2) coating at least one of fluorocarbon resin, epoxy resin, acrylic resin, unsaturated resin and polyurethane resin on a substrate plate, and coating the substrate plate with the thickness of 1-3mm to obtain substrate plate resin; the base plate is selected from one of polyvinyl chloride, polyethylene, polypropylene, unsaturated resin, polyurethane, phenolic resin and bakelite;
(3) the photocatalyst prepared in the step (1) is prepared according to the proportion of 20-300 g/m 2 And (3) uniformly coating the upper surface of the resin of the substrate plate prepared in the step (2), and curing to prepare the photocatalyst plate of the photocatalyst.
10. The cold chain overwrap composite sterilization method of claim 4, wherein g-C in step (1) 3 N 4 And TiO 2 The weight ratio is 7 (3-11).
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| CN106085033A (en) * | 2016-06-20 | 2016-11-09 | 大连海事大学 | A kind of Organic fluoride carbon resin composite coating under visible ray with antifouling sterilization ability and preparation method thereof |
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| CN106085033A (en) * | 2016-06-20 | 2016-11-09 | 大连海事大学 | A kind of Organic fluoride carbon resin composite coating under visible ray with antifouling sterilization ability and preparation method thereof |
| CN108079330A (en) * | 2017-12-20 | 2018-05-29 | 北京科技大学 | A kind of purifying sterilizing method used in farm |
| CN216916894U (en) * | 2021-12-09 | 2022-07-08 | 中储粮成都储藏研究院有限公司 | Bacteriostatic material bag for containing grains |
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