Ultraviolet curing antibacterial coating and preparation method thereof

Abstract

The invention discloses an ultraviolet curing antibacterial coating which is prepared from the following raw materials in parts by weight: 10 to 25 parts of isophorone diisocyanate, 30 to 50 parts of polyether polyol, 0.5 to 1 part of a catalyst, 3 to 5 parts of hydroxyethyl acrylate, 100 to 150 parts of an active monomer diluent, 0.5 to 1 part of a photoinitiator and 0.2 to 0.5 part of a microcapsule bactericide, the microcapsule bactericide is a hinokitiol / oxidized chitosan microcapsule, the wall material of the hinokitiol / oxidized chitosan microcapsule is oxidized chitosan, and the core material of the hinokitiol / oxidized chitosan microcapsule is a hinokitiol ethanol solution. According to the present invention, the hinokitiol / oxidized chitosan microcapsule having the antibacterial property is adopted, and the antibacterial substance stably exists in the coating material in the form of the microcapsule so as not to produce the adverse effect on the performance of the coating material; the oxidized chitosan serving as the wall material has good permeability and stability, so that the microcapsule can stably exist in the coating. Ethanol in the hinokitiol ethanol solution serving as the core material can improve the permeability of hinokitiol, so that the hinokitiol can be better released from the microcapsule, and the bacteriostatic effect of the hinokitiol is exerted.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to an ultraviolet light-cured antibacterial coating and a preparation method thereof. Background Art

[0002] UV-curable coating is a material that can be quickly cured after absorbing ultraviolet rays in a short time through the irradiation of ultraviolet irradiation device. UV-curable coating has the characteristics of high energy utilization, applicable to heat-sensitive substrates, no volatile organic pollution, fast film-forming speed, high coating performance and suitability for continuous mass production. It belongs to a new generation of environmentally friendly coatings. The curing mechanism of UV-curable coating is that the photoinitiator in the coating absorbs ultraviolet light and decomposes into free radicals or ions, which triggers oligomers to undergo polymerization, grafting, cross-linking and other chemical reactions to achieve curing into a continuous coating film. It can be widely used in the coating fields of furniture, cabinets, floors and wooden doors. With the high-quality development of coating technology and people's yearning for a better life, consumers hope that furniture can be durable and have antibacterial effects. Antibacterial coatings are made by adding antibacterial agents with antibacterial functions. However, the antibacterial agents used in existing UV-curable antibacterial coatings are unstable and have poor antibacterial effects.

[0003] The Chinese patent application with application number CN201210379307.8 discloses an antibacterial UV-curable coating and a preparation method thereof, wherein the coating is made by mixing polyurethane acrylate, active acrylate monomer, initiator, leveling agent, special antibacterial agent and diluent. The preparation method includes three stages: batching, dispersing and conditioning. The antibacterial UV-curable coating of the invention uses polyurethane acrylate with high activity and high reaction speed as the main component and carrier, special antibacterial agent and UV initiator as curing agent, leveling agent as auxiliary material, active acrylate monomer and diluent as viscosity regulator, so that the invention has antibacterial effect when forming the UV-curable coating. The invention improves its antibacterial performance by compounding inorganic nanomaterials with organic additives to obtain an antibacterial agent, but the invention may cause poor stability of the antibacterial agent by simply mixing the antibacterial agent in the coating, which reduces its antibacterial performance and may also cause environmental pollution and other problems. The Chinese patent application number CN201510959925.3 discloses an environmentally friendly weather-resistant self-stratified single-component waterproof coating, which includes the following raw material components: aqueous polyurethane emulsion, aqueous polyurethane modified fluorocarbon resin emulsion, bactericide, and defoamer. The raw material components of the waterproof coating, in parts by mass, are as follows: 65-70 parts of aqueous polyurethane emulsion, 30-35 parts of aqueous polyurethane modified fluorocarbon resin emulsion, 0.2-0.4 parts of bactericide, and 0.5-1 parts of defoamer. The waterproof coating of the invention has the characteristics of self-stratification and a long service life, but the addition of the antibacterial agent in the invention will have different degrees of influence on the hardness, adhesion and other properties of the coating. Therefore, it is urgent to develop a coating that can improve the antibacterial property of the coating without affecting other properties of the coating. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a UV-curable antibacterial coating.

[0005] The technical solution of the present invention is as follows:

[0006] One of the purposes of the present invention is to provide a UV-curable antibacterial coating, which is composed of the following raw materials in parts by weight: 10-25 parts of isophorone diisocyanate, 30-50 parts of polyether polyol, 0.5-1 part of catalyst, 3-5 parts of hydroxyethyl acrylate, 100-150 parts of active monomer diluent, 0.5-1 part of photoinitiator, and 0.2-0.5 part of microcapsule bactericide;

[0007] The microcapsule bactericide is hinokitiol / oxidized chitosan microcapsule, the wall material of the hinokitiol / oxidized chitosan microcapsule is oxidized chitosan, and the core material is hinokitiol ethanol solution.

[0008] Furthermore, in the hinokitiol ethanol solution, the concentration of hinokitiol is 600-700 mg / L.

[0009] Furthermore, the mass ratio of the wall material to the core material of the microcapsule fungicide is 1:(1-3).

[0010] Furthermore, the wall material of the cypress alcohol / oxidized chitosan microcapsule is composed of the following raw materials in parts by weight: 25 parts of oxidized chitosan, 100 parts of polyacrylamine hydrochloride, 50 parts of sodium hyalate, 100 parts of sodium polystyrene sulfonate, 300 parts of calcium nitrate tetrahydrate, 200 parts of deionized water, 135 parts of sodium carbonate, 300-500 parts of 3wt% sodium chloride solution, 50-100 parts of 1wt% glacial acetic acid solution, and 200-400 parts of 30wt% ethylenediaminetetraacetic acid solution.

[0011] Furthermore, the preparation process of the microcapsule fungicide is as follows:

[0012] S11: dissolving polyacrylamine hydrochloride in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 5-6, to obtain a solution A for later use;

[0013] S12: dissolving sodium hyaluronate in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 5-6, to obtain a solution B for later use;

[0014] S13: dissolving oxidized chitosan in 1 wt % glacial acetic acid solution, adjusting the pH of the solution to 5-6, to obtain solution C for later use;

[0015] S14: dissolving sodium carbonate in 100 parts of deionized water to obtain a sodium carbonate solution;

[0016] S15: mixing sodium polystyrene sulfonate and calcium nitrate tetrahydrate, adding 100 parts of deionized water and stirring evenly, then adding sodium carbonate solution, stirring evenly, centrifuging, filtering, and washing with water to obtain a microcapsule template;

[0017] S16: adding 1 portion of solution A to the microcapsule template and stirring for 10 minutes, and centrifuging, washing, and drying, then adding 1 portion of solution B and stirring for 10 minutes, and centrifuging, washing, and drying again, and finally adding 1 portion of solution C and stirring for 10 minutes, and centrifuging, washing, and drying to obtain oxidized chitosan microcapsules;

[0018] S17: adding 30 wt % ethylenediaminetetraacetic acid solution to the oxidized chitosan microcapsules, stirring for 10 min, centrifuging, washing, and drying to obtain hollow microcapsules;

[0019] S18: After the ethanol solution of cypress alcohol and the hollow microcapsules are mixed and stirred evenly, the mixture is allowed to stand for 48 hours, and the microcapsule fungicide is obtained after centrifugation, washing and drying.

[0020] Furthermore, the polyether polyol is one of polyether diol and polyether triol, or a mixture of the two.

[0021] Furthermore, the catalyst is dibutyltin dilaurate.

[0022] Furthermore, the active monomer diluent is obtained by mixing isobornyl methacrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate in a ratio of 5:3:2.

[0023] Furthermore, the photoinitiator is one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexyl phenyl ketone, 4-benzoyl-4'-methyl-diphenyl sulfide, or a mixture of several thereof.

[0024] The second object of the present invention is to provide a method for preparing a UV-curable antibacterial coating, comprising the following steps:

[0025] S21: placing the polyether polyol in a reactor at 60-80° C., stirring evenly, cooling to 40-50° C. for standby use;

[0026] S22: at 50° C., stirring the catalyst in a set ratio to obtain a mixture;

[0027] S23: slowly dropping the polyether polyol obtained in step S21 into the mixture obtained in step S22 under stirring, with the dropping time controlled within 1-2 hours, to obtain a polyurethane prepolymer;

[0028] S24: adding hydroxyethyl acrylate to the polyurethane prepolymer, stirring for 1-2 hours, cooling to room temperature, adding an active monomer diluent, stirring for 30 minutes, and obtaining a polyurethane acrylate prepolymer;

[0029] S25: adding a photoinitiator to the polyurethane acrylate prepolymer and stirring for 1 hour, then adding a microcapsule fungicide and stirring for 15 minutes to obtain the UV-curable antibacterial coating.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention provides a UV-curable antibacterial coating, which uses cypermethrin / oxidized chitosan microcapsules with antibacterial properties. The antibacterial substances are stably present in the coating in the form of microcapsules, and will not have an adverse effect on the performance of the coating. In addition, oxidized chitosan itself has good permeability and stability. Using oxidized chitosan as a wall material can well release the bactericidal substances in the microcapsules, and enable the microcapsules to exist stably in the coating. In addition, oxidized chitosan itself has certain antibacterial properties and can replace toxic aldehyde substances, thereby improving the antibacterial properties of the coating. The core material of the microcapsule is cypermethrin ethanol solution, and ethanol can improve the permeability of cypermethrin, so that it can be better released from the microcapsules to exert its antibacterial effect.

[0032] 2. In the process of preparing cypress alcohol / oxidized chitosan microcapsules, the present invention uses a calcium carbonate template formed by dissolving an ethylenediaminetetraacetic acid solution to prepare hollow oxidized chitosan microcapsules. The microcapsules prepared by this method have a complete structure, uniform particle size, high quality, and no aggregation. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with preferred embodiments. The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values; for numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein; the materials, reagents, etc. used in the following embodiments, unless otherwise specified, can be obtained from commercial channels; the experimental methods in the following embodiments, unless otherwise specified, are all conventional methods.

[0034] Example 1

[0035] The present embodiment provides a UV-curable antibacterial coating, which is composed of the following raw materials in parts by weight: 20 parts of isophorone diisocyanate, 40 parts of polyether diol, 0.8 parts of dibutyltin dilaurate, 4 parts of hydroxyethyl acrylate, 120 parts of active monomer diluent, 0.8 parts of photoinitiator, and 0.3 parts of microcapsule bactericide;

[0036] The microcapsule bactericide is hinokitiol / oxidized chitosan microcapsule, the wall material of the hinokitiol / oxidized chitosan microcapsule is oxidized chitosan, and the core material is hinokitiol ethanol solution.

[0037] In this embodiment, the active monomer diluent is obtained by mixing isobornyl methacrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate in a ratio of 5:3:2; the photoinitiator is a mixture of 2-hydroxy-2-methyl-1-phenylpropanone and 1-hydroxycyclohexyl phenyl ketone.

[0038] In this embodiment, the concentration of hinokitiol in the ethanol solution of hinokitiol is 650 mg / L, and the mass ratio of the wall material to the core material of the microcapsule fungicide is 1:2.

[0039] In this embodiment, the wall material of the cypress alcohol / oxidized chitosan microcapsule is composed of the following raw materials in parts by weight: 25 parts of oxidized chitosan, 100 parts of polyacrylamine hydrochloride, 50 parts of sodium hyalate, 100 parts of sodium polystyrene sulfonate, 300 parts of calcium nitrate tetrahydrate, 200 parts of deionized water, 135 parts of sodium carbonate, 400 parts of 3wt% sodium chloride solution, 80 parts of 1wt% glacial acetic acid solution, and 300 parts of 30wt% ethylenediaminetetraacetic acid solution.

[0040] In this embodiment, the preparation process of the microcapsule fungicide is as follows:

[0041] S11: dissolving polyacrylamine hydrochloride in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 5, to obtain a solution A for later use;

[0042] S12: dissolving sodium hyaluronate in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 5, to obtain a solution B for later use;

[0043] S13: dissolving oxidized chitosan in 1 wt % glacial acetic acid solution, adjusting the pH of the solution to 5, to obtain solution C for later use;

[0044] S14: dissolving sodium carbonate in 100 parts of deionized water to obtain a sodium carbonate solution;

[0045] S15: mixing sodium polystyrene sulfonate and calcium nitrate tetrahydrate, adding 100 parts of deionized water and stirring evenly, then adding sodium carbonate solution, stirring evenly, centrifuging, filtering, and washing with water to obtain a microcapsule template;

[0046] S16: adding 1 portion of solution A to the microcapsule template and stirring for 10 minutes, and centrifuging, washing, and drying, then adding 1 portion of solution B and stirring for 10 minutes, and centrifuging, washing, and drying again, and finally adding 1 portion of solution C and stirring for 10 minutes, and centrifuging, washing, and drying to obtain oxidized chitosan microcapsules;

[0047] S17: adding 30 wt % ethylenediaminetetraacetic acid solution to the oxidized chitosan microcapsules, stirring for 10 min, centrifuging, washing, and drying to obtain hollow microcapsules;

[0048] S18: After the ethanol solution of cypress alcohol and the hollow microcapsules are mixed and stirred evenly, the mixture is allowed to stand for 48 hours, and the microcapsule fungicide is obtained after centrifugation, washing and drying.

[0049] This embodiment also provides a method for preparing a UV-curable antibacterial coating, comprising the following steps:

[0050] S21: placing the polyether polyol in a reactor at 70° C., stirring evenly, cooling to 45° C. for standby use;

[0051] S22: at 50° C., stirring the catalyst in a set ratio to obtain a mixture;

[0052] S23: slowly dropping the polyether polyol obtained in step S21 into the mixture obtained in step S22 under stirring, with the dropping time controlled within 1.5 hours, to obtain a polyurethane prepolymer;

[0053] S24: adding hydroxyethyl acrylate to the polyurethane prepolymer, stirring for 1.5 hours, cooling to room temperature, adding an active monomer diluent, stirring for 30 minutes, and obtaining a polyurethane acrylate prepolymer;

[0054] S25: adding a photoinitiator to the polyurethane acrylate prepolymer and stirring for 1 hour, then adding a microcapsule fungicide and stirring for 15 minutes to obtain the UV-curable antibacterial coating.

[0055] Example 2

[0056] The present embodiment provides a UV-curable antibacterial coating, which is composed of the following raw materials in parts by weight: 10 parts of isophorone diisocyanate, 30 parts of polyether triol, 0.5 parts of dibutyltin dilaurate, 3 parts of hydroxyethyl acrylate, 100 parts of active monomer diluent, 0.5 parts of 4-benzoyl-4'-methyl-diphenyl sulfide, and 0.2 parts of microcapsule bactericide;

[0057] The microcapsule bactericide is hinokitiol / oxidized chitosan microcapsule, the wall material of the hinokitiol / oxidized chitosan microcapsule is oxidized chitosan, and the core material is hinokitiol ethanol solution.

[0058] In this embodiment, the active monomer diluent is obtained by mixing isobornyl methacrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate in a ratio of 5:3:2.

[0059] In this embodiment, the concentration of hinokitiol in the hinokitiol ethanol solution is 600 mg / L, and the mass ratio of the wall material to the core material of the microcapsule fungicide is 1:1.

[0060] In this embodiment, the wall material of the cypress alcohol / oxidized chitosan microcapsule is composed of the following raw materials in parts by weight: 25 parts of oxidized chitosan, 100 parts of polyacrylamine hydrochloride, 50 parts of sodium hyaluronic acid, 100 parts of sodium polystyrene sulfonate, 300 parts of calcium nitrate tetrahydrate, 200 parts of deionized water, 135 parts of sodium carbonate, 300 parts of 3wt% sodium chloride solution, 50 parts of 1wt% glacial acetic acid solution, and 200 parts of 30wt% ethylenediaminetetraacetic acid solution.

[0061] In this embodiment, the preparation process of the microcapsule fungicide is as follows:

[0062] S11: dissolving polyacrylamine hydrochloride in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 6, to obtain a solution A for later use;

[0063] S12: dissolving sodium hyaluronate in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 6, to obtain a solution B for later use;

[0064] S13: dissolving oxidized chitosan in 1 wt % glacial acetic acid solution, adjusting the pH of the solution to 6, to obtain solution C for later use;

[0065] S14: dissolving sodium carbonate in 100 parts of deionized water to obtain a sodium carbonate solution;

[0066] S15: mixing sodium polystyrene sulfonate and calcium nitrate tetrahydrate, adding 100 parts of deionized water and stirring evenly, then adding sodium carbonate solution, stirring evenly, centrifuging, filtering, and washing with water to obtain a microcapsule template;

[0067] S16: adding 1 portion of solution A to the microcapsule template and stirring for 10 minutes, and centrifuging, washing, and drying, then adding 1 portion of solution B and stirring for 10 minutes, and centrifuging, washing, and drying again, and finally adding 1 portion of solution C and stirring for 10 minutes, and centrifuging, washing, and drying to obtain oxidized chitosan microcapsules;

[0068] S17: adding 30 wt % ethylenediaminetetraacetic acid solution to the oxidized chitosan microcapsules, stirring for 10 min, centrifuging, washing, and drying to obtain hollow microcapsules;

[0069] S18: After the ethanol solution of cypress alcohol and the hollow microcapsules are mixed and stirred evenly, the mixture is allowed to stand for 48 hours, and the microcapsule fungicide is obtained after centrifugation, washing and drying.

[0070] This embodiment also provides a method for preparing a UV-curable antibacterial coating, comprising the following steps:

[0071] S21: placing the polyether polyol in a reactor at 60° C., stirring evenly, cooling to 40° C. for standby use;

[0072] S22: at 50° C., stirring the catalyst in a set ratio to obtain a mixture;

[0073] S23: slowly dropping the polyether polyol obtained in step S21 into the mixture obtained in step S22 under stirring, with the dropping time controlled within 1 hour, to obtain a polyurethane prepolymer;

[0074] S24: adding hydroxyethyl acrylate to the polyurethane prepolymer, stirring for 1 hour, cooling to room temperature, adding an active monomer diluent, stirring for 30 minutes, and obtaining a polyurethane acrylate prepolymer;

[0075] S25: adding a photoinitiator to the polyurethane acrylate prepolymer and stirring for 1 hour, then adding a microcapsule fungicide and stirring for 15 minutes to obtain the UV-curable antibacterial coating.

[0076] Example 3

[0077] The present embodiment provides a UV-curable antibacterial coating, which is composed of the following raw materials in parts by weight: 25 parts of isophorone diisocyanate, 50 parts of polyether polyol, 1 part of dibutyltin dilaurate, 5 parts of hydroxyethyl acrylate, 150 parts of active monomer diluent, 1 part of photoinitiator, and 0.5 part of microcapsule bactericide;

[0078] The microcapsule bactericide is hinokitiol / oxidized chitosan microcapsule, the wall material of the hinokitiol / oxidized chitosan microcapsule is oxidized chitosan, and the core material is hinokitiol ethanol solution.

[0079] In this embodiment, the polyether polyol is a mixture of polyether diol and polyether triol, the active monomer diluent is obtained by mixing isobornyl methacrylate, 1,6-hexanediol diacrylate, and trimethylolpropane triacrylate in a ratio of 5:3:2, and the photoinitiator is a mixture of 1-hydroxycyclohexyl phenyl ketone and 4-benzoyl-4'-methyl-diphenyl sulfide.

[0080] In this embodiment, the concentration of hinokitiol in the hinokitiol ethanol solution is 700 mg / L, and the mass ratio of the wall material to the core material of the microcapsule fungicide is 1:3.

[0081] In this embodiment, the wall material of the cypress alcohol / oxidized chitosan microcapsule is composed of the following raw materials in parts by weight: 25 parts of oxidized chitosan, 100 parts of polyacrylamine hydrochloride, 50 parts of sodium hyaluronic acid, 100 parts of sodium polystyrene sulfonate, 300 parts of calcium nitrate tetrahydrate, 200 parts of deionized water, 135 parts of sodium carbonate, 500 parts of 3wt% sodium chloride solution, 100 parts of 1wt% glacial acetic acid solution, and 400 parts of 30wt% ethylenediaminetetraacetic acid solution.

[0082] In this embodiment, the preparation process of the microcapsule fungicide is as follows:

[0083] S11: dissolving polyacrylamine hydrochloride in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 6, to obtain a solution A for later use;

[0084] S12: dissolving sodium hyaluronate in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 6, to obtain a solution B for later use;

[0085] S13: dissolving oxidized chitosan in 1 wt % glacial acetic acid solution, adjusting the pH of the solution to 6, to obtain solution C for later use;

[0086] S14: dissolving sodium carbonate in 100 parts of deionized water to obtain a sodium carbonate solution;

[0087] S15: mixing sodium polystyrene sulfonate and calcium nitrate tetrahydrate, adding 100 parts of deionized water and stirring evenly, then adding sodium carbonate solution, stirring evenly, centrifuging, filtering, and washing with water to obtain a microcapsule template;

[0088] S16: adding 1 portion of solution A to the microcapsule template and stirring for 10 minutes, and centrifuging, washing, and drying, then adding 1 portion of solution B and stirring for 10 minutes, and centrifuging, washing, and drying again, and finally adding 1 portion of solution C and stirring for 10 minutes, and centrifuging, washing, and drying to obtain oxidized chitosan microcapsules;

[0089] S17: adding 30 wt % ethylenediaminetetraacetic acid solution to the oxidized chitosan microcapsules, stirring for 10 min, centrifuging, washing, and drying to obtain hollow microcapsules;

[0090] S18: After the ethanol solution of cypress alcohol and the hollow microcapsules are mixed and stirred evenly, the mixture is allowed to stand for 48 hours, and the microcapsule fungicide is obtained after centrifugation, washing and drying.

[0091] This embodiment also provides a method for preparing a UV-curable antibacterial coating, comprising the following steps:

[0092] S21: placing the polyether polyol in a reactor at 80° C., stirring evenly, cooling to 50° C. for standby use;

[0093] S22: at 50° C., stirring the catalyst in a set ratio to obtain a mixture;

[0094] S23: slowly dropping the polyether polyol obtained in step S21 into the mixture obtained in step S22 under stirring, and the dropping time is controlled within 2 hours to obtain a polyurethane prepolymer;

[0095] S24: adding hydroxyethyl acrylate to the polyurethane prepolymer, stirring for 2 hours, cooling to room temperature, adding an active monomer diluent, stirring for 30 minutes, and obtaining a polyurethane acrylate prepolymer;

[0096] S25: adding a photoinitiator to the polyurethane acrylate prepolymer and stirring for 1 hour, then adding a microcapsule fungicide and stirring for 15 minutes to obtain the UV-curable antibacterial coating.

[0097] Example 4

[0098] It is basically the same as Example 1, except that the microcapsule fungicide of this example is prepared by spray freeze drying.

[0099] Comparative Example 1

[0100] The difference from Example 1 is that:

[0101] In this comparative example, the microcapsule fungicide is methylbenzimidazole-2-carbamate / oxidized chitosan microcapsules, the wall material of the methylbenzimidazole-2-carbamate / oxidized chitosan microcapsules is oxidized chitosan, and the core material is methylbenzimidazole-2-carbamate.

[0102] Comparative Example 2

[0103] The difference from Example 1 is that:

[0104] In this comparative example, the microcapsule fungicide is hinokitiol / urea-formaldehyde resin microcapsule, the wall material of the hinokitiol / urea-formaldehyde resin microcapsule is urea-formaldehyde resin, and the core material is hinokitiol ethanol solution.

[0105] Comparative Example 3

[0106] The difference from Example 1 is that:

[0107] In this comparative example, the microcapsule fungicide is hinokitiol / oxidized chitosan microcapsule, the wall material of the hinokitiol / oxidized chitosan microcapsule is oxidized chitosan, and the core material is 100% hinokitiol.

[0108] Comparative Example 4

[0109] The difference from Example 1 is that:

[0110] In this comparative example, the UV-curable antibacterial coating is composed of the following raw materials in parts by weight: 20 parts of isophorone diisocyanate, 40 parts of polyether diol, 0.8 parts of dibutyltin dilaurate, 4 parts of hydroxyethyl acrylate, 120 parts of active monomer diluent, 0.8 parts of photoinitiator, and 0.3 parts of cypress alcohol fungicide;

[0111] The hinokitiol fungicide is a hinokitiol ethanol solution, wherein the concentration of hinokitiol is 650 mg / L.

[0112] Comparative Example 5

[0113] The difference from Example 1 is that:

[0114] This comparative example does not contain microcapsule fungicide.

[0115] Implementation effect evaluation

[0116] The following is a specific test of the UV-curable antibacterial coatings and coatings made from the coatings obtained in Examples 1-4 and Comparative Examples 1-5 to further illustrate the excellent effects achieved by the present invention:

[0117] Antibacterial performance test: Antibacterial performance test is carried out in accordance with the relevant provisions of HG / T 3950-2007 "Antibacterial Coatings";

[0118] Pencil hardness test: Pencil hardness test is carried out in accordance with the relevant provisions of GB / T 6739-2006 "Determination of film hardness of paints and varnishes by pencil method";

[0119] Adhesion test: Adhesion test shall be carried out in accordance with the relevant provisions of GB 1720-1979 "Determination of Adhesion of Paint Films";

[0120] Impact resistance test: carried out in accordance with the relevant provisions of GB / T 1732-1993 "Determination of impact resistance of paint film", the testing instrument is QJL impact tester;

[0121] Salt water resistance test: According to the relevant provisions of GB / T 1733-1993 "Determination of water resistance of paint films", the coating is placed in a 3% by volume sodium chloride solution to observe whether the coating has peeling, wrinkling, blistering, discoloration and loss of gloss.

[0122] The test results are shown in the table below:

[0123] Table 1 Performance test results statistics

[0124]

[0125]

[0126] It can be seen from the above table that the UV-curable antibacterial coating provided by the present invention has good antibacterial properties and can inhibit Escherichia coli and Staphylococcus aureus, and the addition of the antibacterial agent of the present invention will not affect other properties of the coating.

[0127] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A UV-curable antibacterial coating, characterized in that: The invention is composed of the following raw materials in parts by weight: 10-25 parts of isophorone diisocyanate, 30-50 parts of polyether polyol, 0.5-1 parts of catalyst, 3-5 parts of hydroxyethyl acrylate, 100-150 parts of active monomer diluent, 0.5-1 parts of photoinitiator and 0.2-0.5 parts of microcapsule bactericide; The microcapsule bactericide is hinokitiol / oxidized chitosan microcapsule, the wall material of the hinokitiol / oxidized chitosan microcapsule is oxidized chitosan, and the core material is hinokitiol ethanol solution.

2. A UV-curable antibacterial coating according to claim 1, characterized in that: In the hinokitiol ethanol solution, the concentration of hinokitiol is 600-700 mg / L.

3. The UV-curable antibacterial coating according to claim 1, characterized in that: The mass ratio of the wall material to the core material of the microcapsule bactericide is 1:(1-3).

4. The UV-curable antibacterial coating according to claim 1, characterized in that: The wall material of the cypress alcohol / oxidized chitosan microcapsule is composed of the following raw materials in parts by weight: 25 parts of oxidized chitosan, 100 parts of polyacrylamine hydrochloride, 50 parts of sodium hyalate, 100 parts of sodium polystyrene sulfonate, 300 parts of calcium nitrate tetrahydrate, 200 parts of deionized water, 135 parts of sodium carbonate, 300-500 parts of 3wt% sodium chloride solution, 50-100 parts of 1wt% glacial acetic acid solution, and 200-400 parts of 30wt% ethylenediaminetetraacetic acid solution.

5. The UV-curable antibacterial coating according to claim 3, characterized in that: The preparation process of the microcapsule bactericide is as follows: S11: dissolving polyacrylamine hydrochloride in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 5-6, to obtain a solution A for later use; S12: dissolving sodium hyaluronate in a 3 wt % sodium chloride solution, adjusting the pH of the solution to 5-6, to obtain a solution B for later use; S13: dissolving oxidized chitosan in 1 wt % glacial acetic acid solution, adjusting the pH of the solution to 5-6, to obtain solution C for later use; S14: dissolving sodium carbonate in 100 parts of deionized water to obtain a sodium carbonate solution; S15: mixing sodium polystyrene sulfonate and calcium nitrate tetrahydrate, adding 100 parts of deionized water and stirring evenly, then adding sodium carbonate solution, stirring evenly, centrifuging, filtering, and washing with water to obtain a microcapsule template; S16: adding 1 portion of solution A to the microcapsule template and stirring for 10 minutes, and centrifuging, washing, and drying, then adding 1 portion of solution B and stirring for 10 minutes, and centrifuging, washing, and drying again, and finally adding 1 portion of solution C and stirring for 10 minutes, and centrifuging, washing, and drying to obtain oxidized chitosan microcapsules; S17: adding 30 wt % ethylenediaminetetraacetic acid solution to the oxidized chitosan microcapsules, stirring for 10 min, centrifuging, washing, and drying to obtain hollow microcapsules; S18: After the ethanol solution of cypress alcohol and the hollow microcapsules are mixed and stirred evenly, the mixture is allowed to stand for 48 hours, and the microcapsule fungicide is obtained after centrifugation, washing and drying.

6. The UV-curable antibacterial coating according to claim 1, characterized in that: The polyether polyol is one of polyether diol and polyether triol or a mixture of the two.

7. The UV-curable antibacterial coating according to claim 1, characterized in that: The catalyst is dibutyltin dilaurate.

8. The UV-curable antibacterial coating according to claim 1, characterized in that: The active monomer diluent is obtained by mixing isobornyl methacrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate in a ratio of 5:3:

2.

9. The UV-curable antibacterial coating according to claim 1, characterized in that: The photoinitiator is one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexyl phenyl ketone, and 4-benzoyl-4'-methyl-diphenyl sulfide, or a mixture of several of them.

10. A method for preparing a UV-curable antibacterial coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: S21: placing the polyether polyol in a reactor at 60-80° C., stirring evenly, cooling to 40-50° C. for standby use; S22: at 50° C., stirring the catalyst in a set ratio to obtain a mixture; S23: slowly dropping the polyether polyol obtained in step S21 into the mixture obtained in step S22 under stirring, with the dropping time controlled within 1-2 hours, to obtain a polyurethane prepolymer; S24: adding hydroxyethyl acrylate to the polyurethane prepolymer, stirring for 1-2 hours, cooling to room temperature, adding an active monomer diluent, stirring for 30 minutes, and obtaining a polyurethane acrylate prepolymer; S25: adding a photoinitiator to the polyurethane acrylate prepolymer and stirring for 1 hour, then adding a microcapsule fungicide and stirring for 15 minutes to obtain the UV-curable antibacterial coating.

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