An antiviral powder coating and a method for its preparation

Abstract

The application discloses an antiviral powder coating and a preparation method thereof, and relates to the field of coatings. The antiviral powder coating is prepared from 30-35 wt% pigments and fillers, 3.8-4.5 wt% HAA curing agents, 4.5-5.5 wt% negative oxygen ion releasing components, 0.4-0.8 wt% nano-silver ion antiviral components, 0.5-1.5 wt% leveling agents, 0.2-0.5 wt% degassing agents and the rest of polyester resins. The antiviral powder coating in the application is added with the negative oxygen ion releasing components and the nano-silver ion antiviral components. The addition of the negative oxygen ion releasing components can endow the coating with the aldehyde removal performance. In addition, the negative oxygen ion releasing components can accelerate the capture and adhesion of viruses, and the nano-silver ion antiviral components can inactivate the viruses adhered to the coating, so that the coating is endowed with the antiviral performance.

Description

Technical Field

[0001] This application relates to the field of coatings, and in particular to an antiviral powder coating and a method for preparing the same. Background Technology

[0002] In modern industry and daily life, powder coatings are widely used in many fields such as construction, home appliances, and automobiles due to their environmental friendliness, high efficiency, and excellent coating performance. As people's requirements for a healthy living environment continue to increase, their functional needs for powder coatings are also becoming increasingly diversified, especially their antiviral and air-purifying functions, which are receiving more and more attention. Summary of the Invention

[0003] In order to obtain a powder coating that has both antiviral and air-purifying functions, this application provides an antiviral powder coating and a method for preparing the same.

[0004] Firstly, the antiviral powder coating provided in this application adopts the following technical solution: An antiviral powder coating is prepared from 30-35 wt% pigments and fillers, 3.8-4.5 wt% HAA curing agent, 4.5-5.5 wt% negative oxygen ion releasing component, 0.4-0.8 wt% nano silver ion antiviral component, 0.5-1.5 wt% leveling agent, 0.2-0.5 wt% degassing agent, and the balance being polyester resin.

[0005] The antiviral powder coating of this application incorporates negative oxygen ion releasing components and nano-silver ion antiviral components. The addition of the negative oxygen ion releasing components imparts formaldehyde-removing properties to the coating and accelerates virus capture and adhesion. The nano-silver ion antiviral components inactivate viruses adhering to the coating, thus imparting antiviral properties. Furthermore, pigments and fillers provide color to the coating film and reduce costs, while leveling agents and degassing agents work together to improve the smoothness of the coating film.

[0006] In some specific embodiments, the negative oxygen ion releasing component is tourmaline powder.

[0007] In some specific embodiments, the nano-silver ion antiviral component uses nano-zeolite-loaded silver ion powder.

[0008] In this application, the antiviral component of nano silver ions uses nano zeolite to support silver ion powder. Compared with the direct addition of elemental silver, silver ion powder has a stronger antiviral effect. Using zeolite as a carrier for silver ion powder is beneficial to the uniform dispersion of silver ion powder and to increasing the loading of silver ion powder, thereby effectively inactivating the virus.

[0009] In some specific embodiments, the nano-zeolite-loaded silver ion powder is obtained by modifying the nano-zeolite with an aminosilane coupling agent and 3-mercaptopropyltrimethoxysilane to obtain modified nano-zeolite, and then loading silver ions onto it.

[0010] In this application, an aminosilane coupling agent and 3-mercaptopropyltrimethoxysilane are used to modify nano-zeolite to obtain modified nano-zeolite with further enhanced silver ion loading capacity. Then, the modified nano-zeolite is used to load silver ions, which can further increase the silver ion loading capacity and thus further improve the virus inactivation efficiency.

[0011] In some specific embodiments, the weight ratio of the aminosilane coupling agent, 3-mercaptopropyltrimethoxysilane and nano-zeolite is (0.01-0.02):(0.04-0.06):10.

[0012] In some specific embodiments, the preparation method of the nano-zeolite-supported silver ion powder includes the following steps: Aminosilane coupling agent and 3-mercaptopropyltrimethoxysilane were dissolved in an aqueous ethanol solution, and then nano-zeolite was added. The mixture was heated to react, and then filtered, washed and dried to obtain modified nano-zeolite. The modified nano-zeolite was dispersed in an aqueous solution of silver salt, stirred to allow silver ions to be adsorbed into the modified nano-zeolite, and then dried to obtain nano-zeolite-loaded silver ion powder.

[0013] In some specific embodiments, the nano-zeolite-supported silver ion powder is modified with an epoxy-silane coupling agent. The preparation method of the epoxy-silane coupling agent-modified nano-zeolite-supported silver ion powder is as follows: An epoxy-based silane coupling agent is dissolved in a solvent to obtain an epoxy-based silane coupling agent solution; An epoxy silane coupling agent solution was added to nano-zeolite-supported silver ion powder, followed by ball milling and drying to obtain epoxy silane coupling agent-modified nano-zeolite-supported silver ion powder.

[0014] In this application, the nano-zeolite-loaded silver ion powder is modified with an epoxy-silane coupling agent. Through the combined action of the epoxy groups and the carboxyl groups on the polyester resin, the stability of the nano-zeolite-loaded silver ion powder is improved, resulting in a coating with long-lasting antiviral stability. Furthermore, ball milling the nano-zeolite-loaded silver ion powder with the epoxy-silane coupling agent ensures uniform grafting of the silver ion powder and reduces the loss of silver ions during the modification process, thus helping to prevent the decline in the antiviral performance of the epoxy-silane-modified nano-zeolite-loaded silver ion powder.

[0015] In some specific embodiments, the mass ratio of the epoxy silane coupling agent to the solvent is (0.3-0.6):10, and the mass ratio of the nano-zeolite-supported silver ion powder to the epoxy silane coupling agent solution is (1-1.5):5.

[0016] In some specific implementations, during ball milling, the rotation speed is controlled at 500-600 rpm and the temperature is controlled at 50-60℃.

[0017] Secondly, the preparation method of the antiviral powder coating provided in this application adopts the following technical solution: A method for preparing an antiviral powder coating includes the following steps: After uniformly mixing pigments, fillers, HAA curing agent, negative oxygen ion releasing component, nano silver ion antiviral component, leveling agent, degassing agent and polyester resin according to the formula, the mixture is melt-extruded at 100-120℃, pressed into sheets, cooled and crushed to obtain powder coating.

[0018] In summary, this application includes at least the following beneficial technical effects: (1) The antiviral powder coating of this application incorporates negative oxygen ion releasing components and nano-silver ion antiviral components. The addition of negative oxygen ion releasing components can impart formaldehyde-removing properties to the coating. In addition, negative oxygen ion releasing components can accelerate the capture and adhesion of viruses, while nano-silver ion antiviral components can inactivate viruses adhering to the coating, thus imparting antiviral properties to the coating. Furthermore, pigments and fillers can impart color to the coating film and reduce the cost of the coating. The leveling agent and degassing agent work together to improve the smoothness of the coating film.

[0019] (2) In this application, aminosilane coupling agent and 3-mercaptopropyltrimethoxysilane are used to modify nano-zeolite to obtain modified nano-zeolite with further improved silver ion loading capacity. Then, the modified nano-zeolite is used to load silver ions, which can further increase the silver ion loading capacity and thus further improve the virus inactivation efficiency.

[0020] (3) In this application, the nano-zeolite-loaded silver ion powder is modified with an epoxy-silane coupling agent. Through the combined action of the epoxy groups and the carboxyl groups on the polyester resin, the stability of the nano-zeolite-loaded silver ion powder can be improved, thereby giving the coating film a long-lasting antiviral stability. In addition, the epoxy-silane coupling agent modification of the nano-zeolite-loaded silver ion powder by ball milling can make the nano-zeolite-loaded silver ion powder uniformly grafted. At the same time, it can also reduce the loss of silver ions in the nano-zeolite-loaded silver ion powder during the modification process, which is beneficial to preventing the problem of decreased antiviral performance of the nano-zeolite-loaded silver ion powder modified with epoxy-silane coupling agent. Detailed Implementation

[0021] The following section provides further explanation of this application in conjunction with specific experiments.

[0022]

Preparation Example 1

[0023]

Preparation Example 2

[0024]

Comparative Preparation Example 1

[0025]

Comparative Preparation Example 2

[0026]

Preparation Example 3

[0027]

Comparative Preparation Example 3

[0028]

Comparative Preparation Example 4

[0029]

Example 1

[0030]

Example 2

[0031]

Example 3

[0032]

Example 4

[0033]

Example 5

[0034]

Example 6

[0035]

Example 7

[0036] Comparative Example 1 A powder coating differs from [Example 1] in that the nano-silver ion antiviral component is replaced by an equal mass of negative oxygen ion releasing component.

[0037] Comparative Example 2 A powder coating differs from [Example 1] in that the negative oxygen ion releasing component is replaced by an equal mass of the nano silver ion antiviral component prepared in [Preparation Example 1].

[0038] Performance testing Experiment (1) Antiviral performance: The antiviral performance of the cured coatings (thickness of 10 μm, curing conditions of 180℃, 5 min) of each example and comparative example was tested in accordance with ISO 21702:2019. The virus type tested was influenza A virus H1N1.

[0039] Test (2), antibacterial performance: The antibacterial performance of the coatings (thickness of 10 μm, curing conditions of 180℃, 5 min) cured according to the examples and comparative examples of GB / T 21866-2008 was tested. The bacterial species tested were Staphylococcus aureus.

[0040] Test (3) Durability of antiviral and antibacterial properties: The cured coatings (10 μm thick, 180 °C, 5 min) of each example and comparative example were subjected to UV irradiation under the conditions specified in Chapter 8 of GB / T 21866-2008, and then Test (1) and Test (2) were repeated.

[0041] Test (4) Physical properties of the coating: The adhesion between the powder coatings of each example and comparative example and the transparent glass substrate was tested according to GB / T 9286-2021. The coating thickness was 10 μm, the curing condition was 180℃, and the curing time was 5 min. The impact resistance of the cured coatings (10 μm thickness, 180℃, 5 min) of each example and comparative example was tested according to GB / T 1732-2020. The maximum impact height at which no cracks, wrinkles, or peeling were observed in the three tests was recorded. The higher the maximum impact height, the better the impact resistance of the coating.

[0042] Table 1 Antiviral and antibacterial properties Table 2 Antiviral and antibacterial durability properties Example 1 95.20％ 95.90％ Example 2 95.50％ 96.30％ Example 3 <90％ <90％ Example 4 <90％ <90％ Example 5 >99.9％ >99.9％ Example 6 <90％ <90％ Example 7 <95％ <95％ Comparative Example 1 <10％ <10％ Comparative Example 2 <85％ <90％ Table 3 Physical properties of the coating Example 1 0 15 Example 2 0 15 Example 3 0 15 Example 4 0 15 Example 5 0 25 Example 6 0 25 Example 7 0 15 Comparative Example 1 1 15 Comparative Example 2 0 15 Based on the test data recorded in Example 1, Comparative Examples 1-2, and Table 1-3, it can be seen that when negative oxygen ion releasing components are added alone, the powder coating does not have antiviral and antibacterial properties. However, the addition of negative oxygen ion releasing components can accelerate the capture and adhesion of viruses, while the nano silver ion antiviral components can inactivate viruses and bacteria adhering to the coating, thereby effectively improving antiviral and antibacterial efficiency.

[0043] Based on the test data recorded in Examples 1 and 3-4 above and Tables 1-3, it can be seen that in this application, the modification of nano-zeolite by first using aminosilane coupling agent and 3-mercaptopropyltrimethoxysilane can further improve the inactivation efficiency of viruses and bacteria. The reason is speculated to be that the modification of nano-zeolite by aminosilane coupling agent and 3-mercaptopropyltrimethoxysilane further enhances the silver ion loading capacity of the modified nano-zeolite, which can further increase the silver ion loading, thereby improving the inactivation efficiency of viruses and bacteria.

[0044] Based on the test data recorded in Examples 5 and 6-7 above and Tables 1-3, it can be seen that in this application, the nano-zeolite-loaded silver ion powder modified with an epoxy-silane coupling agent obtained by ball milling improves the stability of the nano-zeolite-loaded silver ion powder through the combined action of the epoxy groups and the carboxyl groups on the polyester resin. This results in a coating film with stable and long-lasting antiviral stability. Simultaneously, it reduces the loss of silver ions during the modification process, which helps prevent the decline in the antiviral or antibacterial properties of the epoxy-silane coupling agent-modified nano-zeolite-loaded silver ion powder. Furthermore, the epoxy-silane coupling agent-modified nano-zeolite-loaded silver ion powder obtained by ball milling can further improve the impact resistance of the coating film.

Claims

1. An antiviral powder coating, characterized in that: It is made from 30-35wt% pigments and fillers, 3.8-4.5wt% HAA curing agent, 4.5-5.5wt% negative oxygen ion releasing component, 0.4-0.8wt% nano silver ion antiviral component, 0.5-1.5wt% leveling agent, 0.2-0.5wt% degassing agent and the balance polyester resin; The negative oxygen ion releasing component is tourmaline powder; The antiviral component of the nano-silver ions is prepared by modifying nano-zeolite-supported silver ion powder with an epoxy-silane coupling agent. The preparation method of the epoxy-silane coupling agent-modified nano-zeolite-supported silver ion powder is as follows: The epoxy silane coupling agent 3-glycidoxypropyltrimethoxysilane is dissolved in a solvent, and the mass ratio of the epoxy silane coupling agent 3-glycidoxypropyltrimethoxysilane to the solvent is (0.3-0.6):10, to obtain an epoxy silane coupling agent solution. An epoxy silane coupling agent solution was added to nano-zeolite-supported silver ion powder, wherein the mass ratio of nano-zeolite-supported silver ion powder to epoxy silane coupling agent solution was (1-1.5):

5. The mixture was ball-milled at a speed of 500-600 rpm and a temperature of 50-60℃, and then dried to obtain epoxy silane coupling agent modified nano-zeolite-supported silver ion powder. The preparation method of the nano-zeolite-supported silver ion powder includes the following steps: The aminosilane coupling agent KH550 and 3-mercaptopropyltrimethoxysilane were dissolved in an aqueous ethanol solution, and then nano-zeolite was added. The mixture was heated to react, and then filtered, washed, and dried to obtain modified nano-zeolite. The weight ratio of the aminosilane coupling agent KH550, 3-mercaptopropyltrimethoxysilane and nano-zeolite was (0.01-0.02):(0.04-0.06):

10. The modified nano-zeolite was dispersed in a 0.1 mol / L silver nitrate aqueous solution and stirred for 2 h to allow silver ions to be adsorbed into the modified nano-zeolite. After drying, nano-zeolite loaded with silver ions powder was obtained. The mass ratio of the modified nano-zeolite to the 0.1 mol / L silver nitrate aqueous solution was 1:

5.

2. A method for preparing an antiviral powder coating as described in claim 1, characterized in that, Includes the following steps: After uniformly mixing pigments, fillers, HAA curing agent, negative oxygen ion releasing component, nano silver ion antiviral component, leveling agent, degassing agent and polyester resin according to the formula, the mixture is melt-extruded at 100-120℃, pressed into sheets, cooled and crushed to obtain powder coating.

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