Zinc oxide capsule, polypropylene antibacterial coating and preparation method and application thereof

Abstract

This invention discloses a zinc oxide capsule, a polypropylene antibacterial coating, its preparation method, and its application. The preparation method of the zinc oxide capsule includes: S1. mixing zinc oxide, emulsifier, initiator, triethylamine, and water to obtain a core material mixture; S2. mixing acrylic acid monomers and an organic phase change material to obtain a wall material mixture; S3. mixing the core material mixture and the wall material mixture, and heating to react, thereby obtaining the zinc oxide capsule; in step S2, the acrylic acid monomers contain acrylic acid, resveratrol, and allylcyclopentane in a mass ratio of 1:(0.1-1.5):(0.1-1). The zinc oxide capsule prepared by this invention can simultaneously improve the antibacterial effect, adhesion, wear resistance, and aging resistance of the polypropylene antibacterial coating.

Description

Technical Field

[0001] This invention relates to the field of materials technology, and more specifically, to a zinc oxide capsule, a polypropylene antibacterial coating, a preparation method thereof, and its application. Background Technology

[0002] Antibacterial coatings are coatings with bactericidal and bacteriostatic functions, made by adding antibacterial agents that have antibacterial properties and can remain stably in the coating film, and then processing them through a certain process. Common resin base materials for these coatings are polypropylene, polyurethane, etc. The main function of these coatings is to protect buildings from various microorganisms such as bacteria, mold, and algae, while preventing walls from becoming a transmission route for bacteria and viruses, thus protecting public health. Antibacterial coatings have a wide range of applications, including but not limited to high-touch areas such as walls, countertops, and door handles, as well as medical facilities and medical equipment in hospitals. Antibacterial coatings can not only reduce the number of bacteria in public places, reducing the chance of cross-infection and contact infection; they can also effectively reduce the bacterial density on furniture and other items in the home environment, optimizing the living environment.

[0003] Good adhesion not only ensures the long-lasting adhesion of antibacterial coatings to the substrate surface, preventing peeling and maintaining their antibacterial function for a long time, but also extends the coating's service life, reduces the frequency of maintenance and replacement, and thus lowers long-term costs. Good aging resistance not only allows the antibacterial components in the coating to maintain their activity for a longer period, continuously exerting their antibacterial effect throughout the coating's service life, but also reduces the damage to the coating caused by various factors such as sunlight, temperature changes, humidity, and industrial gases, extending the coating's service life. Good abrasion resistance not only maintains the surface properties of the coating during use, reducing the loss of antibacterial agents due to wear, thus maintaining the coating's long-lasting antibacterial effect, but also allows it to withstand friction, abrasion, or scratching without easily wearing down, extending the coating's service life.

[0004] Therefore, developing a zinc oxide capsule that can simultaneously improve the antibacterial effect, adhesion, abrasion resistance, and aging resistance of polypropylene antibacterial coatings is of great significance. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a zinc oxide capsule, a polypropylene antibacterial coating, a preparation method thereof, and its application.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a method for preparing zinc oxide capsules, the method comprising the following steps:

[0008] S1. Mix zinc oxide, emulsifier, initiator, triethylamine and water to obtain a core material mixture;

[0009] S2. Mix acrylic monomers and organic phase change materials to obtain a wall material mixture;

[0010] S3. Mix the core material mixture and the wall material mixture, and heat to react, thus obtaining zinc oxide capsules;

[0011] In step S2, the acrylic acid mixed monomers contain acrylic acid, resveratrol and methanalylcyclopentane in a mass ratio of 1:(0.1-1.5):(0.1-1).

[0012] The zinc oxide capsules prepared by this invention can simultaneously improve the antibacterial effect, adhesion, wear resistance and aging resistance of polypropylene antibacterial coatings.

[0013] Specifically, the zinc oxide capsule wall material constructed by controlling the mass ratio of acrylic acid, resveratrol, and allylcyclopentane in this invention not only has excellent strength, enabling it to firmly encapsulate the antibacterial agent zinc oxide, but also exhibits excellent compatibility with polypropylene. This promotes the uniform dispersion of zinc oxide capsules in a polypropylene antibacterial coating system with polypropylene as the resin base, thereby improving the antibacterial effect, adhesion, abrasion resistance, and aging resistance of the polypropylene antibacterial coating.

[0014] Preferably, in step S2, the acrylic acid mixed monomers contain acrylic acid, resveratrol, and allylcyclopentane in a mass ratio of 1:(0.4-1.2):(0.3-0.8).

[0015] More preferably, in step S2, the acrylic acid mixed monomers contain acrylic acid, resveratrol, and allylcyclopentane in a mass ratio of 1:0.8:0.5.

[0016] Preferably, the mass ratio of the acrylic acid mixed monomers to zinc oxide is 1:(0.5-3).

[0017] More preferably, the mass ratio of the acrylic acid mixed monomers to zinc oxide is 1:(1-2.5).

[0018] By controlling the mass ratio of acrylic acid monomers and zinc oxide, this invention not only enables the wall material constructed using acrylic acid, resveratrol, and allylcyclopentane to more firmly encapsulate the antibacterial agent zinc oxide, but also makes the zinc oxide capsules easier and more uniformly dispersed in a polypropylene antibacterial coating system with polypropylene as the resin base. This is more conducive to improving the antibacterial effect, adhesion, wear resistance, and aging resistance of the polypropylene antibacterial coating.

[0019] More preferably, the mass ratio of the acrylic acid mixed monomers to zinc oxide is 1:1.7.

[0020] Preferably, the average particle size of the zinc oxide is 20-500 nm.

[0021] In this invention, the average particle size of the zinc oxide is a range of one or any two of the following: 20nm, 30nm, 40nm, 50nm, 60nm, 70nm, 80nm, 90nm, 100nm, 110nm, 120nm, 130nm, 140nm, 150nm, 160nm, 170nm, 180nm, 190nm, 200nm, 220nm, 240nm, 250nm, 260nm, 280nm, 300nm, 320nm, 340nm, 350nm, 360nm, 380nm, 400nm, 420nm, 450nm, 460nm, 480nm, and 500nm.

[0022] More preferably, the average particle size of the zinc oxide is 50-300 nm.

[0023] Preferably, the mass ratio of the acrylic acid mixed monomers to the emulsifier is 1:(0.05-0.4).

[0024] Preferably, the mass ratio of the acrylic acid mixed monomers to the initiator is 1:(0.01-0.3).

[0025] Preferably, the mass ratio of the acrylic acid mixed monomers to triethylamine is 1:(0.05-0.5).

[0026] Preferably, the mass ratio of the acrylic acid monomer mixture to water is 1:(3-40).

[0027] Preferably, the mass ratio of the acrylic acid mixed monomer to the organic phase change material is 1:(5-50).

[0028] Preferably, in step S1, the mixing temperature is 30-70°C.

[0029] Preferably, in step S2, the mixing temperature is 40-90°C.

[0030] Preferably, in step S3, the temperature of the heating reaction is 50-90°C.

[0031] Preferably, in step S3, the heating reaction time is 0.5-8 hours.

[0032] Preferably, in step S3, after the heating reaction, the process further includes filtration, washing, and drying.

[0033] Preferably, in step S3, the mixing of the core material mixture and the wall material mixture refers to mixing the core material mixture by simultaneously stirring the wall material mixture and adding it dropwise.

[0034] Preferably, the emulsifier is at least one of sodium lauryl polyoxyethylene ether sulfate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, and ammonium lauryl polyoxyethylene ether sulfate.

[0035] Preferably, the initiator is ammonium persulfate and / or potassium persulfate.

[0036] Preferably, the organic phase change material is at least one of n-hexadecane, n-octadecane, n-docosahexadecane, and n-tetradecane.

[0037] Secondly, the present invention provides a zinc oxide capsule prepared by the preparation method described in the first aspect.

[0038] Thirdly, the present invention provides an application of zinc oxide capsules in coatings.

[0039] Fourthly, the present invention provides a polypropylene antibacterial coating, comprising the following components by weight:

[0040] 100 parts polypropylene, 5-25 parts zinc oxide capsules, 30-150 parts solvent, and 0-15 parts additives.

[0041] Preferably, the zinc oxide capsules are in the form of 10-20 parts by weight.

[0042] Preferably, the polypropylene is copolymer polypropylene and / or homopolymer polypropylene.

[0043] Preferably, the solvent is at least one selected from butyl acetate, ethyl acetate, ethylene glycol monobutyl ether, n-butanol, n-butyl acetate, and toluene.

[0044] Preferably, the additive is at least one of defoamer, antioxidant, and filler.

[0045] Commonly used defoamers, antioxidants, and fillers in this field can all be used in this invention.

[0046] More preferably, the defoamer is at least one of phosphate ester type defoamer, polyether type defoamer, and silicone type defoamer.

[0047] More preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, and 2,6-di-tert-butyl-4-methylphenol (BHT).

[0048] More preferably, the filler is mica powder, kaolin, talc powder, or barium sulfate.

[0049] Fifthly, the present invention provides a method for preparing a polypropylene antibacterial coating, comprising: heating and mixing the components to obtain the antibacterial coating.

[0050] Preferably, the heating temperature is 50-90°C.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] The zinc oxide capsules prepared by this invention can simultaneously improve the antibacterial effect, adhesion, wear resistance and aging resistance of polypropylene antibacterial coatings.

[0053] Specifically, the zinc oxide capsule wall material constructed by controlling the mass ratio of acrylic acid, resveratrol, and allylcyclopentane in this invention not only has excellent strength, enabling it to firmly encapsulate the antibacterial agent zinc oxide, but also exhibits excellent compatibility with polypropylene. This promotes the uniform dispersion of zinc oxide capsules in a polypropylene antibacterial coating system with polypropylene as the resin base, thereby improving the antibacterial effect, adhesion, abrasion resistance, and aging resistance of the polypropylene antibacterial coating.

[0054] By controlling the mass ratio of acrylic acid monomers and zinc oxide, this invention not only enables the wall material constructed using acrylic acid, resveratrol, and allylcyclopentane to more firmly encapsulate the antibacterial agent zinc oxide, but also makes the zinc oxide capsules easier and more uniformly dispersed in a polypropylene antibacterial coating system with polypropylene as the resin base. This is more conducive to improving the antibacterial effect, adhesion, wear resistance, and aging resistance of the polypropylene antibacterial coating. Attached Figure Description

[0055] Figure 1 The figures show actual images of the polypropylene antibacterial coatings used in Application Example 1 and Comparative Application Example 5. In the figures, Figure A is an actual image of the polypropylene antibacterial coating used in Application Example 1, and Figure B is an actual image of the polypropylene coating used in Comparative Application Example 5. Detailed Implementation

[0056] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0057] The experimental methods in the following examples, comparative examples, application examples and comparative application examples, unless otherwise specified, are generally performed under conventional conditions in the art or under conditions recommended by the manufacturer; the raw materials and reagents used, unless otherwise specified, are all commercially available from the conventional market.

[0058] The use of reagents in the various embodiments, comparative examples, application examples, and comparative application examples of this invention is as follows:

[0059] Zinc oxide-1, Brofos-ZnO-150, with an average particle size of 150 nm, manufactured by Brofos Nanotechnology (Ningbo) Co., Ltd.

[0060] Zinc oxide-2, Brofos-ZnO-300, with an average particle size of 300nm, manufactured by Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0061] Zinc oxide-3, Brofos-ZnO-50, with an average particle size of 50 nm, manufactured by Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0062] Zinc oxide-4, Brofos-ZnO-500, with an average particle size of 500 nm, manufactured by Brovas Nanotechnology (Ningbo) Co., Ltd.

[0063] Zinc oxide-5, Brofos-ZnO-20, with an average particle size of 20nm, manufactured by Bohuas Nanotechnology (Ningbo) Co., Ltd.

[0064] Polypropylene-1, copolymer polypropylene, EP548R, CNOOC Shell Petrochemicals Co., Ltd.;

[0065] Polypropylene-2, homopolymer polypropylene, HP500N, LyondellBasell Industries, Ltd.

[0066] Defoamer, silicone defoamer, BYK-141, BYK;

[0067] Antioxidant, Antioxidant 1010 is commercially available;

[0068] Filler, mica powder, D302549, Shanghai Aladdin.

[0069] Example 1

[0070] This embodiment provides a zinc oxide capsule, the preparation method of which includes the following steps:

[0071] S1. Under conditions of 50℃ and 300r / min, zinc oxide-1 (average particle size of 150nm), emulsifier (sodium lauryl polyoxyethylene ether sulfate), initiator (potassium persulfate), triethylamine and water are stirred and mixed to obtain a core material mixture;

[0072] S2. At 60℃ and 300r / min, acrylic acid monomers and organic phase change material (n-hexadecane) are mixed to obtain a wall material mixture;

[0073] S3. While stirring the wall material mixture, add the core material mixture dropwise and mix. Heat the mixture at 70°C for 2.5 hours, filter, wash with water, and dry at 65°C to obtain zinc oxide capsules.

[0074] In step S2, the acrylic acid mixed monomers contain acrylic acid, resveratrol, and allylcyclopentane in a mass ratio of 1:0.8:0.5.

[0075] The mass ratio of the acrylic acid mixed monomers to zinc oxide-1 is 1:1.7;

[0076] The mass ratio of the acrylic acid monomer mixture to the emulsifier (sodium lauryl polyoxyethylene ether sulfate) is 1:0.2;

[0077] The mass ratio of the acrylic acid monomer mixture to the initiator (potassium persulfate) is 1:0.1;

[0078] The mass ratio of the acrylic acid mixed monomers to triethylamine is 1:0.3;

[0079] The mass ratio of the acrylic acid monomer mixture to water is 1:20;

[0080] The mass ratio of the acrylic acid mixed monomers to the organic phase change material (n-hexadecane) is 1:40.

[0081] Examples 1-9 and Comparative Examples 1-4

[0082] Examples 1-9 and Comparative Examples 1-4 provide different zinc oxide capsules, differing from Example 1 in the mass ratio of acrylic acid, resveratrol, and allylcyclopentane; otherwise, they are identical to Example 1, as detailed in the table below:

[0083] Table 1. Mass ratios of acrylic acid, resveratrol, and allylcyclopentane in Examples 1-9 and Comparative Examples 1-4

[0084]

[0085]

[0086] Examples 10-13

[0087] Examples 10-13 provide different zinc oxide capsules, which differ from Example 1 in the mass ratio of acrylic acid mixed monomers and zinc oxide-1. All other aspects are the same as in Example 1, as shown in the table below:

[0088] Table 2. Mass ratio of 10-13 acrylic acid mixed monomers and zinc oxide-1 in Example 1

[0089] The mass ratio of acrylic acid mixed monomers to zinc oxide-1 Example 1 1:1.7 Example 10 1:1 Example 11 1:2.5 Example 12 1:0.5 Example 13 1:3

[0090] Examples 14-17

[0091] Examples 14-17 provide different zinc oxide capsules, which differ from Example 1 in that they use different types of zinc oxide; otherwise, they are the same as Example 1, as shown in the table below:

[0092] Table 3. Types of Zinc Oxide in Examples 1, 14-17

[0093] Types of zinc oxide Average particle size of zinc oxide / nm Example 1 Zinc oxide-1 150 Example 14 Zinc oxide-2 300 Example 15 Zinc oxide-3 50 Example 16 Zinc oxide-4 500 Example 17 Zinc oxide-5 20

[0094] Application Example 1

[0095] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0096] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 1, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0097] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0098] Application Example 2

[0099] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0100] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 2, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0101] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0102] Application Example 3

[0103] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0104] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 3, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0105] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0106] Application Example 4

[0107] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0108] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 4, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0109] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0110] Application Example 5

[0111] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0112] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 5, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0113] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0114] Application Example 6

[0115] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0116] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 6, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0117] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0118] Application Example 7

[0119] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0120] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 7, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0121] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0122] Application Example 8

[0123] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0124] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 8, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0125] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0126] Application Example 9

[0127] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0128] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 9, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0129] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0130] Application Example 10

[0131] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0132] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 10, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0133] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0134] Application Example 11

[0135] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0136] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 11, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0137] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0138] Application Example 12

[0139] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0140] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 12, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0141] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0142] Application Example 13

[0143] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0144] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 13, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0145] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0146] Application Example 14

[0147] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0148] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 14, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0149] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0150] Application Example 15

[0151] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0152] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 15, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0153] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0154] Application Example 16

[0155] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0156] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 16, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0157] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0158] Application Example 17

[0159] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0160] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 17, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0161] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0162] Application Example 18-21

[0163] Application Examples 18-21 provide different polypropylene antibacterial coatings, which differ from Application Example 1 in that the weight proportions of the zinc oxide capsules prepared in Example 1 are different, while the rest are the same as in Application Example 1, as shown in the table below:

[0164] Table 4. Types of Zinc Oxide in Examples 1, 18-21

[0165]

[0166] Application Example 22

[0167] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0168] 100 parts of polypropylene-2 ​​(homopolymer polypropylene), 15 parts of zinc oxide capsules prepared in Example 1, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0169] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0170] Application Example 23

[0171] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0172] 100 parts of polypropylene-1 (copolymer polypropylene), 5 parts of zinc oxide capsules prepared in Example 1, 30 parts of solvent (butyl acetate), and 0 parts of additives.

[0173] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0174] Application Example 24

[0175] This application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0176] 100 parts of polypropylene-1 (copolymer polypropylene), 25 parts of zinc oxide capsules prepared in Example 1, 150 parts of solvent (butyl acetate), 5 parts of defoamer (BYK-141), 5 parts of antioxidant (antioxidant 1010), and 5 parts of filler (mica powder).

[0177] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0178] Comparative Application Example 1

[0179] This comparative application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0180] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Comparative Example 1, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0181] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0182] Comparative Application Example 2

[0183] This comparative application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0184] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Comparative Example 2, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0185] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0186] Comparative Application Example 3

[0187] This comparative application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0188] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Comparative Example 3, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0189] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0190] Comparative Application Example 4

[0191] This comparative application example provides a polypropylene antibacterial coating, which, by weight, comprises the following components:

[0192] 100 parts of polypropylene-1 (copolymer polypropylene), 15 parts of zinc oxide capsules prepared in Comparative Example 4, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0193] The preparation method of the above-mentioned polypropylene antibacterial coating includes: heating and mixing the components at 80°C to obtain the antibacterial coating.

[0194] Comparative Application Example 5

[0195] This comparative application example provides a polypropylene coating, which, by weight, comprises the following components:

[0196] 100 parts of polypropylene-1 (copolymer polypropylene), 0 parts of zinc oxide capsules, 90 parts of solvent (butyl acetate), 2 parts of defoamer (BYK-141), 3 parts of antioxidant (antioxidant 1010), and 2 parts of filler (mica powder).

[0197] The preparation method of the above-mentioned polypropylene coating includes: heating and mixing the components at 80°C to obtain the polypropylene coating.

[0198] Performance testing

[0199] Performance tests were conducted on the polypropylene antibacterial coatings in each application example and comparative application example, as detailed below:

[0200] 1. Antibacterial effect test:

[0201] The antibacterial effects of polypropylene antibacterial coatings in various application examples and comparative application examples were tested according to Appendix A of standard HG / T 3950-2007, "Antibacterial Coatings - Test Methods for Antibacterial Performance". Staphylococcus aureus (ATCC 29213) was used as the test bacteria, and the concentration of the test bacterial solution was 5.0 × 10⁻⁶. 5 CFU / mL, volume 0.4mL, wooden board as coating test board, polypropylene antibacterial coating of comparative application example 5 as blank control sample, record the antibacterial rate (%) of polypropylene antibacterial coating of each application example and comparative application example.

[0202] The higher the antibacterial rate, the better the antibacterial effect of the polypropylene antibacterial coating.

[0203] 2. Adhesion test:

[0204] 40g of each application example or comparative application example of polypropylene antibacterial coating was applied to a 40mm×40mm×2mm tinplate surface and cured at 80℃ for 7h to obtain test samples; then the adhesion of the test samples was tested according to GB / T 9286-2021, and the adhesion grade (level) of each application example and comparative application example of polypropylene antibacterial coating was recorded.

[0205] The higher the adhesion rating, the worse the adhesion of the polypropylene antibacterial coating.

[0206] 3. Abrasion resistance test:

[0207] 40g of each application example or comparative application example of polypropylene antibacterial coating was applied to a 40mm×40mm×2mm tinplate surface and cured at 80℃ for 7h to obtain test samples. Then, the wear resistance of the test samples was tested according to GB / T 1768-2006. Specifically, under the conditions of 1000g rubber grinding wheel load and 1000 revolutions, the wear mass of each application example and comparative application example of polypropylene antibacterial coating was measured and recorded (accurate to 0.1mg).

[0208] The greater the wear mass, the worse the wear resistance of the polypropylene antibacterial coating;

[0209] 4. Aging resistance test:

[0210] 40g of each application example or comparative application example of polypropylene antibacterial coating was coated on a 40mm×40mm×2mm tinplate surface and cured at 80℃ for 7h to obtain test samples; then, it was tested for 1200h according to Method B of GB / T 23987-2009, and the aging resistance performance level of polypropylene antibacterial coating was evaluated according to Table 23 of GB / T 1766-2008 "Evaluation of Comprehensive Aging Performance Level of Protective Coating Film", and the aging resistance performance level (grade) of polypropylene antibacterial coating of each application example and comparative application example was recorded.

[0211] The higher the grade of aging resistance, the worse the aging resistance of the polypropylene antibacterial coating.

[0212] The experimental results are shown in the table below:

[0213] Table 5 Performance test results of polypropylene antibacterial coatings in various application examples and comparative application examples.

[0214]

[0215]

[0216] Figure 1 The figures show actual images of the polypropylene antibacterial coating used in Application Example 1 and Comparative Application Example 1. In the figures, Figure A is an actual image of the polypropylene antibacterial coating used in Application Example 1, and Figure B is an actual image of the polypropylene antibacterial coating used in Comparative Application Example 5.

[0217] As shown in Table 5, the zinc oxide capsules prepared by this invention can simultaneously improve the antibacterial effect, adhesion, wear resistance and aging resistance of polypropylene antibacterial coatings.

[0218] Specifically, the zinc oxide capsule wall material constructed by controlling the mass ratio of acrylic acid, resveratrol, and allylcyclopentane in this invention not only has excellent strength, enabling it to firmly encapsulate the antibacterial agent zinc oxide, but also exhibits excellent compatibility with polypropylene. This promotes the uniform dispersion of zinc oxide capsules in a polypropylene antibacterial coating system with polypropylene as the resin base, thereby improving the antibacterial effect, adhesion, abrasion resistance, and aging resistance of the polypropylene antibacterial coating.

[0219] In particular, as can be seen from application examples 1 and 10-13, by controlling the mass ratio of acrylic acid mixed monomers and zinc oxide, the present invention can not only make the wall material constructed using acrylic acid, resveratrol and methanalylcyclopentane more firmly encapsulate the antibacterial agent zinc oxide, but also make the zinc oxide capsules more easily and evenly dispersed in the polypropylene antibacterial coating system with polypropylene as the resin base, thereby further improving the antibacterial effect, adhesion, wear resistance and aging resistance of the polypropylene antibacterial coating.

[0220] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing zinc oxide capsules, characterized in that, The preparation method includes the following steps: S1. Mix zinc oxide, emulsifier, initiator, triethylamine and water to obtain a core material mixture; S2. Mix acrylic monomers and organic phase change materials to obtain a wall material mixture; S3. Mix the core material mixture and the wall material mixture, and heat to react, thus obtaining zinc oxide capsules; In step S2, the acrylic acid mixed monomers contain acrylic acid, resveratrol and methanalylcyclopentane in a mass ratio of 1:(0.1-1.5):(0.1-1).

2. The method for preparing zinc oxide capsules as described in claim 1, characterized in that, Includes at least one of the following (1)-(3): (1) In step S2, the acrylic acid mixed monomer contains acrylic acid, resveratrol and methanylcyclopentane in a mass ratio of 1:(0.4-1.2):(0.3-0.8); (2) The mass ratio of the acrylic acid mixed monomers to zinc oxide is 1:(0.5-3); (3) The average particle size of the zinc oxide is 20-500 nm.

3. The method for preparing zinc oxide capsules as described in claim 2, characterized in that, Includes at least one of the following (1)-(2): (1) The mass ratio of the acrylic acid mixed monomers to zinc oxide is 1:(1-2.5); (2) The average particle size of the zinc oxide is 50-300 nm.

4. The method for preparing zinc oxide capsules as described in claim 1, characterized in that, Includes at least one of the following (1)-(5): (1) The mass ratio of the acrylic acid mixed monomers to the emulsifier is 1:(0.05-0.4); (2) The mass ratio of the acrylic acid mixed monomers to the initiator is 1:(0.01-0.3); (3) The mass ratio of the acrylic acid mixed monomers to triethylamine is 1:(0.05-0.5); (4) The mass ratio of the acrylic acid mixed monomers to water is 1:(3-40); (5) The mass ratio of the acrylic acid mixed monomer and the organic phase change material is 1:(5-50).

5. The method for preparing zinc oxide capsules as described in claim 1, characterized in that, Includes at least one of the following (1)-(5): (1) In step S1, the mixing temperature is 30-70℃; (2) In step S2, the mixing temperature is 40-90℃; (3) In step S3, the temperature of the heating reaction is 50-90℃; (4) In step S3, after the heating reaction, the process also includes filtration, washing, and drying; (5) In step S3, the mixed core material mixture and the mixed wall material mixture refer to mixing the core material mixture while stirring the wall material mixture.

6. The method for preparing zinc oxide capsules as described in claim 1, characterized in that, Includes at least one of the following (1)-(3): (1) The emulsifier is at least one of sodium lauryl polyoxyethylene ether sulfate, sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, and ammonium lauryl polyoxyethylene ether sulfate; (2) The initiator is ammonium persulfate and / or potassium persulfate; (3) The organic phase change material is at least one of n-hexadecane, n-octadecane, n-docosahexadecane, and n-tetradecane.

7. A zinc oxide capsule, characterized in that, It is prepared by any one of the preparation methods described in claims 1-6.

8. The application of the zinc oxide capsule of claim 7 in a coating.

9. A polypropylene antibacterial coating, characterized in that, Calculated by weight, it includes the following components: 100 parts of polypropylene, 5-25 parts of the zinc oxide capsules as described in claim 7, 30-150 parts of solvent, and 0-15 parts of additives.

10. A method for preparing the polypropylene antibacterial coating according to claim 9, characterized in that, include: The antibacterial coating is obtained by heating and mixing the components.

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