Antibacterial hardening coating as well as preparation method and application thereof

Abstract

The invention provides an antibacterial hardening coating as well as a preparation method and application thereof. The antibacterial hardening coating is prepared from the following components in parts by weight: 55 to 75 parts of hydroxy acrylic resin, 10 to 20 parts of hydroxy ketone compounds and 5 to 10 parts of acylphosphine oxide, and 3-5 parts of an antibacterial agent. According to the antibacterial hardening coating and the preparation method thereof, the specific components are designed, and all the components are further matched to prepare the antibacterial hardening coating with relatively high hardness, relatively high adhesiveness and relatively good antibacterial property, so that the prepared antibacterial hardening coating is suitable for preparing an antibacterial hardening oil cup of a range hood.

Description

Technical Field

[0001] The invention belongs to the technical field of coating materials, and in particular relates to an antibacterial hardened coating and a preparation method and application thereof. Background Art

[0002] With the continuous improvement of people's living standards, most kitchens are equipped with range hoods. The range hood can allow the air with oil smoke to be discharged from the kitchen through the exhaust duct, which can reduce the choking smell in the kitchen. In addition, exhausting oil smoke through the range hood can reduce the oil smoke inhaled by the human body, which is beneficial to the health of the body.

[0003] During the use of the range hood, the negative pressure generated by the high-speed rotation of the impeller takes away the generated oil smoke. As a result, the filter and inner cavity of the range hood will store a large amount of grease, which will eventually flow into the oil collector - the oil cup. When the old oil in the oil cup accumulates to a certain amount, it must be removed for cleaning. The old oil at the bottom of the oil cup will condense into a relatively stubborn sediment, which requires a very strong alkaline detergent to clean, which is time-consuming and labor-intensive. At the same time, the alkaline detergent will also cause certain damage to human skin. In addition, there are many organic components in the oil cup, which is very easy to breed bacteria over time. At present, there are still a large number of resin oil cups in the industry. Many oil cups are made of PC material with a very low surface hardness. Therefore, it is very necessary to develop an antibacterial and super-hard oil cup.

[0004] CN106885274A discloses an oil cup for a range hood that is easy to clean from oil stains, and is mainly composed of an oil cup body, an oil absorbing sponge, and a connector. The surface of the oil cup body is coated with a polytetrafluoroethylene (Teflon) coating to prevent the adhesion of oil stains. An oil absorbing sponge that matches the oil cup body is placed in the cup, which is convenient and quick to replace. The connector fixed in the center of the bottom of the oil cup body can be connected to the connector under the oil mesh cover. When in use, the oil absorbing sponge can be placed in the oil cup body. After installation and use for a period of time, the oil cup can be removed, the sponge can be taken out, the cup wall can be wiped, and a new oil absorbing sponge can be replaced. This technical solution is to place an oil absorbing sponge in the oil cup body, and by replacing the oil absorbing sponge, the oil cup body can be kept clean, but it is not an improvement to the oil cup itself.

[0005] Therefore, how to improve the oil cup itself and how to provide an antibacterial and super-hard coating on the surface of the oil cup has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an antibacterial hardened coating and its preparation method and application. The present invention designs the specific composition of the present invention, and further prepares an antibacterial hardened coating with high hardness, high adhesion and good antibacterial property through the coordination of various components. The antibacterial hardened coating prepared in this way is suitable for preparing the antibacterial hardened oil cup of the range hood.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides an antibacterial hard coating, wherein the antibacterial hard coating comprises the following components in parts by weight:

[0009] 55-75 parts of hydroxy acrylic resin;

[0010] 10-20 parts of hydroxyketone compounds;

[0011] 5-10 parts of acylphosphine oxide;

[0012] 3-5 parts of antibacterial agent.

[0013] In the present invention, the hydroxy acrylic resin is cured to form a cross-linked network structure, and the coating prepared by the antibacterial hard coating on the surface of the oil cup has properties such as heat resistance, water resistance, weather resistance, hardness, adhesion, etc. that are significantly better than those of ordinary acrylic resins.

[0014] In the present invention, the hydroxy ketone compound (including α-hydroxy ketone photoinitiator containing diphenylethylene) has good light absorption performance in the near-ultraviolet region and a fast photodecomposition speed. Compared with the traditional mercury lamp curing, the initiator has a sensitive absorption photoinitiator in the LED system curing.

[0015] The present invention uses acylphosphine oxide as a photoinitiator, which has greater absorption in the ultraviolet light region and the visible light region. After photolysis, it generates free radicals with high initiation activity, which can initiate curing more effectively than other photoinitiators. Acylphosphine oxide photoinitiator hardly turns yellow after curing and under long-term light radiation, has a bleaching effect on light, and the rays can penetrate the coating, so that the thick film can be completely cured; hydroxyl ketone compounds have active chemical properties, can widely participate in reactions such as polymerization and condensation, can react with acrylic resin to obtain heterocyclic compounds, increase crosslinking density, and improve the surface hardness of the thick film.

[0016] The present invention designs the specific composition of and further prepares an antibacterial hardened coating with higher hardness, higher adhesion and better antibacterial property through the coordination of various components. The antibacterial hardened coating prepared in this way is suitable for preparing antibacterial hardened oil cups of range hoods.

[0017] In the present invention, an antibacterial hard coating with excellent performance is prepared through the synergistic effect of hydroxyketone compounds and acylphosphine oxides.

[0018] At the same time, in the present invention, by controlling the amount of hydroxy acrylic resin within a specific range, an antibacterial hard coating with excellent comprehensive performance is prepared. If the amount of hydroxy acrylic resin is too little, the heat resistance, hardness, adhesion and other properties of the coating prepared by the antibacterial hard coating provided by the present invention will all decrease; if the amount of hydroxy acrylic resin is too much, the viscosity of the antibacterial hard coating provided by the present invention increases, affecting its construction performance.

[0019] In the present invention, the weight proportion of the hydroxy acrylic resin in the antibacterial hard coating can be 55 parts, 57 parts, 60 parts, 63 parts, 65 parts, 68 parts, 70 parts, 72 parts or 75 parts.

[0020] The weight proportion of the hydroxyketone compound in the antibacterial hard coating can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts, etc.

[0021] The weight proportions of acylphosphine oxide in the antibacterial hard coating can be 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts or 10 parts, etc.

[0022] The weight proportions of the antibacterial agent in the antibacterial hard coating can be 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts or 5 parts, etc.

[0023] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0024] As a preferred technical solution of the present invention, the mass percentage of hydroxyl groups in the hydroxylated acrylic resin is 2-4%, for example, it can be 2%, 2.2%, 2.4%, 2.6%, 2.8%, 3%, 3.2%, 3.4%, 3.6%, 3.8% or 4%, etc.

[0025] In the present invention, the comprehensive performance of the coating prepared from the antibacterial hard coating is further optimized by controlling the mass percentage of the hydroxyl group in the hydroxyl acrylic resin within a specific range.

[0026] Preferably, the number average molecular weight of the hydroxy acrylic resin is 500-1500, for example, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400 or 1500, etc.

[0027] Preferably, the hydroxylated acrylic resin is selected from any one or a combination of at least two of CFU2406B, CFU3780, CFU2775, CFU3075 or CFU3570 produced by Shadong Ka-Formula Polymer Materials Co., Ltd.

[0028] Preferably, the weight proportion of the acrylate in the antibacterial hard coating is 60-65 parts, for example, 60 parts, 61 parts, 62 parts, 63 parts, 64 parts or 65 parts.

[0029] As a preferred technical solution of the present invention, the hydroxyketone compound includes an α-hydroxyketone photoinitiator containing diphenylethylene, and is further preferably a photoinitiator Irgacure 1173.

[0030] Preferably, the weight proportion of the hydroxyketone compound in the antibacterial hard coating is 14-16 parts, for example, 14 parts, 14.5 parts, 15 parts, 15.5 parts or 16 parts.

[0031] As a preferred technical solution of the present invention, the acylphosphine oxide is selected from any one or a combination of at least two of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, bisacylphosphine oxide, carbazolylacylphosphine oxide or diphenylphosphine oxide;

[0032] Preferably, the weight proportion of the acylphosphine oxide in the antibacterial hard coating is 7-8 parts, for example, 7 parts, 7.2 parts, 7.4 parts, 7.6 parts, 7.8 parts or 8 parts.

[0033] As a preferred technical solution of the present invention, the antibacterial agent includes any one of nano zinc oxide, nano silver or nano copper oxide, or a combination of at least two of them.

[0034] Preferably, the nano zinc oxide is selected from any one or a combination of at least two of CS2132PA, CS1952, SHL-CRE1021, and HSL-PA-2021 produced by Guangzhou Zhongxing Nano New Materials;

[0035] As a preferred technical solution of the present invention, the antibacterial hardened coating further comprises an auxiliary agent, and the auxiliary agent comprises a wetting agent and / or a leveling agent;

[0036] Preferably, the weight proportion of the wetting agent in the antibacterial hard coating is 0.2-1 part (for example, it can be 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part, etc.), more preferably 0.6-1.0 part, and further preferably 0.7-0.8 part.

[0037] Preferably, the wetting agent is selected from any one of MOK-5011, MOK-5027, and MOK-5035 produced by Merck, Germany, or a combination of at least two thereof.

[0038] Preferably, the weight proportion of the leveling agent in the antibacterial hard coating is 0.1-0.5 parts, for example, it can be 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts or 0.5 parts, etc.

[0039] Preferably, the leveling agent is selected from any one of MOK-2021, MOK-2024, and MOK-2100 produced by Merck, Germany, or a combination of at least two thereof.

[0040] As a preferred technical solution of the present invention, the antibacterial hardened coating also includes a solvent.

[0041] Preferably, the weight proportion of the solvent in the antibacterial hard coating is 50-80 parts (for example, 50 parts, 52 parts, 55 parts, 57 parts, 60 parts, 63 parts, 66 parts, 68 parts, 70 parts, 72 parts, 75 parts, 77 parts or 80 parts, etc.), more preferably 55-80 parts, and even more preferably 60-75 parts;

[0042] Preferably, the solvent is selected from any one of propylene glycol methyl ether, butyl acetate, isobutyl alcohol, methyl isobutyl ketone, and ethyl acetate, or a combination of at least two thereof.

[0043] In a second aspect, the present invention provides a method for preparing the antibacterial hard coating as described in the first aspect, the preparation method comprising the following steps:

[0044] The components of the antibacterial hard coating are mixed to obtain the antibacterial hard coating.

[0045] As a preferred technical solution of the present invention, the preparation method comprises the following steps:

[0046] The hydroxy acrylic resin, hydroxy ketone compound, acylphosphine oxide and solvent are mixed, and then the optional wetting agent and leveling agent are added thereto and mixed evenly, and finally the antibacterial agent is added thereto and mixed evenly, filtered, and vacuum degassed to obtain the antibacterial hardened coating.

[0047] It should be noted that the present invention does not have any special restrictions on the mixing method of the above-mentioned components, and the commonly used mixing methods in the art are applicable, including but not limited to: stirring and mixing at a rotation speed of 400-600rpm (for example, it can be 400rpm, 420rpm, 440rpm, 460rpm, 480rpm, 500rpm, 520rpm, 540rpm, 560rpm, 580rpm or 600rpm, etc.).

[0048] In a third aspect, the present invention provides an application of the antibacterial hardened coating as described in the first aspect, wherein the antibacterial hardened coating is used to prepare a range hood;

[0049] Preferably, the range hood comprises an oil cup, and the antibacterial hardened coating is used to prepare the oil cup.

[0050] Furthermore, the oil cup includes a cup body and a coating disposed on the surface of the cup body, and the coating is prepared by the antibacterial hardened coating provided by the present invention.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] (1) The present invention designs the specific composition of the present invention, and further prepares an antibacterial hardened coating with higher hardness, higher adhesion and better antibacterial property through the coordination of various components. The antibacterial hardened coating prepared in this way is suitable for preparing antibacterial hardened oil cups of range hoods.

[0053] (2) The antibacterial hard coating provided by the present invention is applied to the surface of a PC substrate. After forming a coating, the hardness of the PC substrate is increased from 2B to 6H, the adhesion of the coating is 5B, and the antibacterial property is 99.99%.

[0054] (3) The present invention further optimizes the comprehensive performance of the antibacterial hard coating by designing the content of hydroxyl groups in the hydroxyl acrylic resin. DETAILED DESCRIPTION

[0055] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0056] The sources of some components in the embodiments and comparative examples are shown in Table 1 below:

[0057] Table 1

[0058] Components illustrate Hydroxylated acrylic resin 1 Purchased from Sadong Kaforme polymer materials, CFU2406B, hydroxyl content is 2.4% Hydroxylated acrylic resin 2 Purchased from Shadong Kafule polymer materials, CFU3780, hydroxyl content is 3.8% Hydroxylated acrylic resin 3 Purchased from Sadong Kaforme polymer materials, CFU2775, hydroxyl content is 2.7% Hydroxylated acrylic resin 4 Purchased from Shadong Kafule polymer materials, CFU3075, hydroxyl content is 3% Hydroxylated acrylic resin A Purchased from Guangdong Jiayuan New Materials, the brand is PAR-1125-60, the hydroxyl content is 1.9% Hydroxylated acrylic resin B Purchased from Guangdong Jiayuan New Materials, brand name PAR-1135-70, hydroxyl content 4.5% Acrylic resin Purchased from Guangdong Jiayuan New Materials, brand name WAR-2516-55 Hydroxyketone compounds 1 α-Hydroxyketone photoinitiator containing diphenylethylene, purchased from Merck, Germany, brand name Irgacure 1173 Hydroxyketone compounds 2 α-Hydroxyketone photoinitiator containing diphenylethylene, purchased from Merck, Germany, brand name Irgacure 184 Acylphosphine oxide 1 Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide Acylphosphine oxide 2 Bisacylphosphine oxide Acylphosphine oxide 3 Diphenylphosphine oxide Nano zinc oxide Purchased from Guangzhou Zhongxing Nano New Materials, CS2132PA Leveling agent Purchased from Merck, Germany, MOK-2021 Wetting Agents Purchased from Merck, Germany, MOK-5011 Solvents Propylene glycol methyl ether

[0059] Example 1-Example 13, Comparative Example 1-Comparative Example 5

[0060] Example 1-Example 13, Comparative Example 1-Comparative Example 5 respectively provide an antibacterial hard coating, and the specific components of the antibacterial hard coating are shown in Table 2-Table 3 below (the amount of each component in Table 2-Table 3 is in parts by weight);

[0061] The preparation method of the antibacterial hard coating is as follows:

[0062] At a rotation speed of 500 rpm, the hydroxy acrylic resin, hydroxy ketone compound, acylphosphine oxide and solvent are stirred and mixed, and then the rotation speed is maintained to add a wetting agent and a leveling agent and mix them evenly. Finally, the rotation speed is maintained to add an antibacterial agent and mix them evenly. The mixture is filtered and vacuum degassed to obtain the antibacterial hardened coating.

[0063] Table 2

[0064]

[0065] Table 3

[0066]

[0067]

[0068] Comparative Example 6

[0069] This comparative example provides a coating purchased from Lanco Road with a brand number of L8322.

[0070] Comparative Example 7

[0071] This comparative example provides a coating purchased from Shiyue with the brand name HD-150330.

[0072] The coatings provided in the above embodiments and comparative examples were sprayed on a transparent PC substrate (with a hardness of 2B, cleaned with isopropyl alcohol, degreased, and treated with antistatic treatment) by a spray gun, and the properties of the film layer were measured after leveling, heating, and UV curing. The curing conditions are shown in Table 4.

[0073] Table 4

[0074] project Process Require 1 Spray gun spraying 0.4MPa, 23℃±2℃, 55±5%RH 2 Leveling 23℃±2℃, let stand for 2~3min 3 heating 70℃,5min 4 UV Curing 600MJ / M, time 10~15s 5 test After curing, let it stand for 1 hour before testing

[0075] The performance of the PC film (composed of a PC substrate and a coating layer bonded together, and the coating layer is prepared from the coating provided in the above embodiments and comparative examples) prepared by the coating provided in the above embodiments and comparative examples was tested, and the specific test method is as follows:

[0076] Film thickness: Use a film thickness meter to test the thickness of the PC film;

[0077] Hardness of PC substrate: Fix the PC substrate on a horizontal plane, select a series of pencils with different hardness (from 2B to 8H), set the angle between the pencil and the PC substrate to 45°, apply a pressure of 300g, push the pencil forward at a speed of 6cm / s, the pencil leaves a mark under the PC substrate, erase the pencil mark with an eraser, observe whether the pencil leaves a scratch on the PC substrate, find the pencil with the minimum hardness that can leave a scratch on the PC substrate, and define its hardness as the hardness of the PC substrate;

[0078] Hardness of PC film: Fix the PC film with coating on a horizontal plane, select a series of pencils with different hardness (from 2B to 8H), set the angle between the pencil and the PC substrate to 45°, apply a pressure of 300g, push the pencil forward at a speed of 6cm / s, the pencil leaves a mark under the PC substrate, erase the pencil mark with an eraser, observe whether the pencil leaves a scratch on the PC substrate, find the pencil with the minimum hardness that can leave a scratch on the PC substrate, and define its hardness as the hardness of the PC film;

[0079] Adhesion: Tested using the 100-grid method;

[0080] Antimicrobial properties: Tested according to ISO 22196:2011.

[0081] The above performance test results are shown in Table 5 below:

[0082] Table 5

[0083]

[0084]

[0085] From the above content, it can be seen that the present invention designs the specific composition of and further prepares an antibacterial hardened coating with higher hardness, higher adhesion and better antibacterial property through the coordination of each component. The antibacterial hardened coating prepared in this way is suitable for preparing antibacterial hardened oil cups of range hoods.

[0086] The antibacterial hardened coating provided by the present invention is applied to the surface of a PC substrate to form a coating, which increases the hardness of the PC substrate from 2B to above 3H, the adhesion of the coating is above 4B, and the antibacterial property is greater than 99.99%.

[0087] It can be seen from Examples 5-9 that the present invention further optimizes the comprehensive performance of the antibacterial hard coating by designing the content of hydroxyl groups in the hydroxyl acrylic resin, increases the hardness of the PC substrate from 2B to above 4H, and the adhesion of the coating is above 5B.

[0088] It can be seen from Example 5, Examples 10-13, and Comparative Examples 1-2 that the present invention controls the amount of hydroxy acrylic resin within a specific range to prepare an antibacterial hard coating with excellent performance, increases the hardness of the PC substrate from 2B to above 5H, and the adhesion of the coating is above 5B.

[0089] It can be seen from Examples 1-13 and Comparative Example 3 that, compared with the use of acrylic resin (Comparative Example 3), the present invention prepares an antibacterial hard coating with excellent performance by using hydroxy acrylic resin.

[0090] It can be seen from Example 5 and Comparative Examples 4-5 that the present invention prepares an antibacterial hard coating with excellent performance through the synergistic effect of hydroxyketone compounds and acylphosphine oxides.

[0091] In summary, the present invention designs the specific composition of the antibacterial hardened coating and further prepares the antibacterial hardened coating with higher hardness, higher adhesion and better antibacterial property through the coordination of the components.

[0092] The applicant declares that the present invention illustrates the detailed process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An antibacterial hard coating, characterized in that: The antibacterial hard coating comprises the following components in parts by weight:

2. The antibacterial hard coating according to claim 1, characterized in that: The mass percentage of hydroxyl groups in the hydroxyl acrylic resin is 2-4%; Preferably, the number average molecular weight of the hydroxy acrylic resin is 500-1500; Preferably, the hydroxylated acrylic resin is selected from any one or a combination of at least two of CFU2406B, CFU3780, CFU2775, CFU3075 or CFU3570 produced by Shadong Kafule Polymer Materials Co., Ltd.; Preferably, the weight proportion of the acrylate in the antibacterial hard coating is 60-65 parts.

3. The antibacterial hard coating according to claim 1 or 2, characterized in that: The hydroxyketone compound includes an α-hydroxyketone photoinitiator containing stilbene; Preferably, the weight proportion of the hydroxyketone compound in the antibacterial hard coating is 14-16 parts.

4. The antibacterial hard coating according to any one of claims 1 to 3, characterized in that: The acylphosphine oxide is selected from any one or a combination of at least two of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, bisacylphosphine oxide, carbazolylacylphosphine oxide or diphenylphosphine oxide; Preferably, the weight proportion of the acylphosphine oxide in the antibacterial hard coating is 7-8 parts.

5. The antibacterial hard coating according to any one of claims 1 to 4, characterized in that: The antibacterial agent includes any one of nano zinc oxide, nano silver or nano copper oxide, or a combination of at least two of them.

6. The antibacterial hard coating according to any one of claims 1 to 5, characterized in that: The antibacterial hard coating also includes an auxiliary agent, which includes a wetting agent and / or a leveling agent; Preferably, the weight proportion of the wetting agent in the antibacterial hard coating is 0.2-1 part, more preferably 0.6-1.0 part, and even more preferably 0.7-0.8 part; Preferably, the weight proportion of the leveling agent in the antibacterial hard coating is 0.1-0.5 parts.

7. The antibacterial hard coating according to any one of claims 1 to 6, characterized in that: The antibacterial hard coating also includes a solvent; Preferably, the weight proportion of the solvent in the antibacterial hard coating is 50-80 parts, more preferably 55-80 parts, and even more preferably 60-75 parts; Preferably, the solvent is selected from any one of propylene glycol methyl ether, butyl acetate, isobutyl alcohol, methyl isobutyl ketone, and ethyl acetate, or a combination of at least two thereof.

8. A method for preparing an antibacterial hard coating according to any one of claims 1 to 7, characterized in that: The preparation method comprises the following steps: The components of the antibacterial hard coating are mixed to obtain the antibacterial hard coating.

9. The preparation method according to claim 8, characterized in that: The preparation method comprises the following steps: The hydroxy acrylic resin, hydroxy ketone compound, acylphosphine oxide and solvent are mixed, and then the optional wetting agent and leveling agent are added thereto and mixed evenly, and finally the antibacterial agent is added thereto and mixed evenly, filtered, and vacuum degassed to obtain the antibacterial hardened coating.

10. An application of the antibacterial hard coating according to any one of claims 1 to 7, characterized in that: The antibacterial hardened coating is used to prepare a range hood; Preferably, the range hood comprises an oil cup, and the antibacterial hardened coating is used to prepare the oil cup.

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