Two-component water-based ultraviolet-curable coating and application thereof

Abstract

The application discloses a two-component water-based ultraviolet curing paint and belongs to the technical field of ultraviolet curing paint. The two-component water-based ultraviolet curing paint is prepared by compounding a reaction product or mixture of plant oil-based dicarboxylic acid, triethylamine and water as a second component, and a first component composed of a multi-function water-based polyurethane acrylate emulsion, a photoinitiator and pearl powder. The coating prepared from the two-component water-based ultraviolet curing paint has excellent fullness, mechanical property, adhesion, water boiling resistance and yellowing resistance.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ultraviolet light curing coatings, and particularly relates to a two-component water-based ultraviolet light curing coating and application thereof. BACKGROUND

[0002] The "3C" electronic product refers to computer, communication and consumer electronic product, and the shell of the electronic product is generally made of plastic material or metal material, which usually needs to be decorated or protected by a coating. The main diluent of the water-based ultraviolet light curing coating is water, and the oligomer or monomer in the system is dissolved in water, which has good environmental protection, and the ultraviolet light curing is mainly cured by ultraviolet light irradiation, which has fast curing speed and low energy consumption, and is favored by people.

[0003] The ultraviolet light curing coating has been widely applied in the "3C" product due to its high efficiency and environmental protection, but the yellowing of the coating is caused by the photoinitiator in the ultraviolet light curing process, and the benzene ring structure in the system aggravates the yellowing of the curing system. The continuous yellowing of the coating affects the color of the coating, which affects the appearance of the coating on one hand, and affects the judgment of the color in the coating preparation process, so that the preparation process has uncertainty. It is of great significance to prepare a water-based ultraviolet light curing coating which is environmentally friendly, does not affect the performance of the coating, and can solve the yellowing problem of the ultraviolet light curing coating. SUMMARY

[0004] The purpose of the present disclosure is to overcome the shortcomings of the prior art, and provide a two-component water-based ultraviolet light curing coating and application thereof. The coating prepared by the two-component water-based ultraviolet light curing coating has excellent fullness, mechanical properties, adhesion, water boiling resistance and yellowing resistance.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present disclosure is to provide a two-component water-based ultraviolet light curing coating, which comprises 100 parts by weight of a first component and 10-40 parts by weight of a second component; based on 100 parts of the first component, the following components are contained: 50-90 parts of a water-based polyurethane acrylate emulsion, 1-5 parts of a first photoinitiator, 1-10 parts of pearl powder, and 1-50 parts of water; wherein the functionality of the water-based polyurethane acrylate emulsion is greater than or equal to 3.

[0006] The second component comprises a reaction product or mixture of a vegetable oil-based dicarboxylic acid, triethylamine and water; wherein the molar ratio of the vegetable oil-based dicarboxylic acid to triethylamine is 1:(2-2.10), and the mass of water is 30-50% of the total mass of the vegetable oil-based dicarboxylic acid and triethylamine.

[0007] In one embodiment, the second component is 20-30 parts by weight.

[0008] In one embodiment, the waterborne polyurethane acrylate emulsion is 55-70 parts by weight.

[0009] In one embodiment, the preparation method of the plant oil-based dicarboxylic acid comprises mixing plant oil acid, mercaptoacetic acid and a second photoinitiator to perform photochemical reaction to obtain the plant oil-based dicarboxylic acid.

[0010] In one embodiment, the molar ratio of the plant oil acid and the mercaptoacetic acid is (1-1.20):1, and the mass of the second photoinitiator is 3-8% of the total mass of the plant oil acid and the mercaptoacetic acid.

[0011] In one embodiment, the plant oil acid is at least one of ricinoleic acid, oleic acid, eleostearic acid, linolenic acid, linoleic acid, and erucic acid; and the second photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0012] In one embodiment, the first component further comprises 0.01-5 parts by weight of a color paste and 0.01-10 parts by weight of an auxiliary agent.

[0013] In one embodiment, the auxiliary agent is at least one of a leveling agent, a defoaming agent, a wetting agent, and a matting powder.

[0014] In one embodiment, the first photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, and phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide.

[0015] In another aspect, the use of the two-component waterborne ultraviolet-curable coating for coating a substrate is provided.

[0016] In still another aspect, a coating layer obtained by heat treatment and photocuring of the two-component waterborne ultraviolet-curable coating is provided, wherein the temperature of the heat treatment is 50-80°C.

[0017] Compared with the prior art, the present disclosure has the following advantages:

[0018] (1) The coating layer prepared from the waterborne ultraviolet-curable coating of the present application has excellent fullness, mechanical properties, adhesion, water boiling resistance, and yellowing resistance.

[0019] (2) The waterborne ultraviolet-curable coating of the present application uses plant oil acid as a raw material, thereby improving the environmental performance of the waterborne ultraviolet-curable coating. DETAILED DESCRIPTION

[0020] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] In the present application, the technical features described in an open way include both the closed technical solutions consisting of the listed features and the open technical solutions containing the listed features.

[0022] In the present application, if no special description is made, the numerical range is regarded as continuous and includes the minimum value and the maximum value of the range and each value between the minimum value and the maximum value. Further, when the range is an integer, each integer between the minimum value and the maximum value of the range is included. In addition, when multiple ranges are provided to describe a feature or a property, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood as including any and all sub-ranges subsumed therein.

[0023] In the present application, the specific dispersion and stirring treatment method is not particularly limited.

[0024] The reagents or instruments used in the present application are all conventional products that can be obtained by purchase on the market, if no manufacturer is indicated.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0026] To achieve the above-mentioned purposes, the technical solution adopted by the present disclosure is to provide a two-component water-based ultraviolet curing paint, which comprises 100 parts by weight of a first component and 10-40 parts by weight of a second component; based on 100 parts of the first component, the following components are included: 50-90 parts of a water-based polyurethane acrylate emulsion, 1-5 parts of a first photoinitiator, 1-10 parts of a pearl powder, and 1-50 parts of water; wherein the functionality of the water-based polyurethane acrylate emulsion is ≥3.

[0027] The second component comprises a reaction product or mixture of a vegetable oil-based dicarboxylic acid, triethylamine and water; wherein the molar ratio of the vegetable oil-based dicarboxylic acid and the triethylamine is 1:(2-2.10), and the mass of the water is 30-50% of the total mass of the vegetable oil-based dicarboxylic acid and the triethylamine.

[0028] The water-based ultraviolet curing coating is obtained after curing the water-based ultraviolet curing coating composed of the first component and the second component in the application. The double bond in the vegetable oil acid and the mercaptoacetic acid undergo a photo-click reaction to generate a vegetable oil-based dicarboxylic acid. After the vegetable oil-based dicarboxylic acid, the triethylamine and the water are uniformly mixed, a uniform and stable emulsion is formed. During the mixing process, part of the vegetable oil-based dicarboxylic acid and the triethylamine react to form a tertiary amine salt, neutralizing the acidity of the vegetable oil-based dicarboxylic acid, which can avoid the problem of the stability of the two-component water-based ultraviolet curing coating caused by the low pH value of the second component. On the other hand, the vegetable oil-based dicarboxylic acid in the second component can improve the grid density of the water-based ultraviolet curing coating, increase the solid content of the water-based ultraviolet curing coating, and thus improve the fullness of the water-based ultraviolet curing coating. On the other hand, the fatty long-chain structure in the vegetable oil-based dicarboxylic acid undergoes entanglement and crosslinking during the curing process, improving the mechanical properties, water boiling resistance and yellowing resistance of the water-based photo-cured coating. In addition, the use of vegetable oil acid as raw material improves the environmental performance of the water-based ultraviolet curing coating.

[0029] For example, the molar ratio of the vegetable oil-based dicarboxylic acid and the triethylamine in the second component can be 1:2, 1:2.02, 1:2.05, 1:2.08, 1:2.1 or a range formed by any two of them, but is not limited to the listed values. Values within this range that are not listed are also applicable.

[0030] For example, the mass of the water in the second component can be 30%, 32%, 34%, 36%, 38%, 40%, 41%, 43%, 45%, 47%, 50% or a range formed by any two of them of the total mass of the vegetable oil-based dicarboxylic acid and the triethylamine, but is not limited to the listed values. Values within this range that are not listed are also applicable.

[0031] In the second component, the content of the components in the above range can obtain a second component with high stability.

[0032] In the application, the weight parts of the second component can be 10 parts, 12 parts, 15 parts, 17 parts, 20 parts, 23 parts, 25 parts, 28 parts, 30 parts, 32 parts, 35 parts, 38 parts, 40 parts or a range formed by any two of them, but is not limited to the listed values. Values within this range that are not listed are also applicable.

[0033] More specifically, the weight parts of the second component are 20-30 parts.

[0034] The inventors of the present application further explored the influence of the weight fraction of the second component on the effect in the water-based ultraviolet light-cured coating, and found that when the weight fraction of the second component is controlled in the range of 10-40 parts, excellent fullness, mechanical properties, adhesion, boiling water resistance and yellowing resistance can be obtained. If the weight fraction of the second component is too small (i.e. <10 parts by weight), the yellowing resistance of the cured coating will decrease. If the weight fraction of the second component is too large (i.e. >40 parts), although the yellowing resistance of the water-based light-cured coating can be improved to some extent, the mechanical properties and boiling water resistance of the water-based light-cured coating will be significantly reduced.

[0035] For example, the weight fraction of the water-based polyurethane acrylic emulsion can be 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 63 parts, 66 parts, 69 parts, 72 parts, 75 parts, 78 parts, 81 parts, 84 parts, 87 parts, 90 parts, or a range formed by any two of the above values, but is not limited to the listed values. Other values not listed in the range are also applicable.

[0036] The inventors explored the influence of the content of the water-based polyurethane acrylic emulsion on the performance of the product. If the content of the water-based polyurethane acrylic emulsion is less than 50 parts by weight, the mechanical properties and yellowing resistance of the water-based ultraviolet light-cured coating will be significantly reduced. If the content of the water-based polyurethane acrylic emulsion is greater than 90 parts by weight, the tensile strength and yellowing resistance of the obtained water-based ultraviolet light-cured coating will be significantly reduced. The present application preferably uses 55-70 parts by weight of the water-based polyurethane acrylic emulsion.

[0037] In one embodiment, the functionality of the water-based polyurethane acrylic emulsion is 2-4, for example, it can be 2, 3, or 4, but is not limited to the listed values. Other values not listed in the range are also applicable.

[0038] The inventors further explored the influence of the functionality of the water-based polyurethane acrylic emulsion on the performance of the product, and found that when the functionality of the water-based polyurethane acrylic emulsion is 3-4, the performance of the product can be improved. As specific examples of water-based polyurethane acrylic emulsions with a functionality of 3-4, Bluekote L-9841W and WU3602X from Wuxing (Guangzhou Wuxing Material Technology Co., Ltd.) can be listed.

[0039] In one embodiment, the method for preparing the plant oil-based dicarboxylic acid comprises mixing plant oil acid, mercaptoacetic acid and a second photoinitiator to perform photochemical reaction to obtain the plant oil-based dicarboxylic acid.

[0040] In one embodiment, the molar ratio of the vegetable oil acid and mercaptoacetic acid is (1-1.20):1, and the mass of the second photoinitiator is 3-8% of the total mass of the vegetable oil acid and mercaptoacetic acid.

[0041] For example, the molar ratio of the vegetable oil acid and mercaptoacetic acid can be 1:1, 1.05:1, 1.1:1, 1.15:1, 1.2:1, or a range consisting of any two of them, but not limited to the listed values, and other unlisted values within the range are also applicable.

[0042] For example, the mass of the second photoinitiator can be 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8% of the total mass of the vegetable oil acid and mercaptoacetic acid, or a range consisting of any two of them, but not limited to the listed values, and other unlisted values within the range are also applicable.

[0043] In one embodiment, the vegetable oil acid is at least one of ricinoleic acid, oleic acid, eleostearic acid, linolenic acid, linoleic acid, and erucic acid; and the second photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone.

[0044] In one embodiment, the first component further comprises 0.01-5 parts by weight of a color paste, 0.01-10 parts by weight of an auxiliary agent; and the auxiliary agent is at least one of a leveling agent, a defoaming agent, a wetting agent, and a matting powder.

[0045] The type of auxiliary agent required can be determined by the intended use and actual needs of a person skilled in the art.

[0046] The defoaming agent is preferably at least one of BYK-024, CA-2041, B-83, HT-530, BKY-019, etc.

[0047] The leveling agent can be at least one of BYK-333, BKY-326, BYK-355, etc.

[0048] The wetting agent can be at least one of BYK-346, BKY-347, and BYK-349.

[0049] In one embodiment, the first photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, and phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide.

[0050] Specifically, the weight of the pearl powder can be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, based on 100 parts of the first component, but the present application is not limited thereto.

[0051] Specifically, the average particle size of the pearl powder is 1-60 μm, and more specifically, the grade of the pearl powder is forged silk white.

[0052] It should be noted that the preparation method of the first component is not particularly limited in the present application, and those skilled in the art can prepare the raw materials into the first component according to conventional technical means, for example, by mixing the components uniformly in proportion.

[0053] It should be noted that the preparation method of the first component is not particularly limited in the present application, and those skilled in the art can prepare the raw materials into the first component according to conventional technical means, for example, by mixing the components uniformly in proportion; specifically, the preparation method of the second component is as follows: stirring the vegetable oil-based dicarboxylic acid at room temperature for 0-0.5 h, then adding triethylamine dropwise, continuing to stir for 0.5-1 h, cooling to room temperature, adding deionized water, and continuing to stir for 0.5-1 h to obtain the second component.

[0054] It should be noted that the preparation method of the water-based ultraviolet curing coating is not particularly limited in the present application, and those skilled in the art can prepare it into a water-based ultraviolet curing coating according to conventional technical means, for example, by mixing the first component and the second component uniformly in proportion.

[0055] On the other hand, the use of the two-component water-based ultraviolet curing coating for coating a substrate is provided.

[0056] In another aspect, a coating layer obtained by heat treatment and photocuring of the two-component water-based ultraviolet curing coating is provided, wherein the temperature of the heat treatment is 50-80 °C.

[0057] In the present application, the temperature of the heat treatment can be 50 °C, 55 °C, 60 °C, 65 °C, 70 °C, 75 °C, 80 °C, but is not limited to the listed values, and other values not listed in this range are also applicable.

[0058] The temperature of the heat treatment significantly affects the performance of the coating layer, and when the temperature of the heat treatment is less than 50 °C or greater than 80 °C, the mechanical properties, boiling water resistance, and yellowing resistance of the obtained coating layer are all significantly reduced.

[0059] Specifically, the temperature of the heat treatment can be 5-15 min, for example, 5 min, 6 min, 8 min, 9 min, 10 min, 12 min, 15 min, but the present application is not limited thereto.

[0060] Specifically, the wavelength of the photocuring is 365 nm.

[0061] Specifically, the photocuring time is 30-60 s.

[0062] The reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the art unless otherwise specified.

[0063] The present application is further described below with specific examples:

[0064] The ricin oil-based dicarboxylic acid is self-made, and the preparation method is as follows: 298.46 (1 mol) parts by weight of ricinoleic acid and 92.12 (1 mol) parts by weight of mercaptoacetic acid are uniformly mixed, then 19.53 parts by weight of 2-hydroxy-2-methyl-1-phenyl-1-propanone is added, the mixture is uniformly stirred, the obtained solution is placed in a photochemical reaction instrument, and irradiated with ultraviolet light of 365 nm wavelength at room temperature for 5 h to obtain the ricin oil-based dicarboxylic acid.

[0065] The oleic acid-based dicarboxylic acid is self-made, and the preparation method is as follows: 282.46 (1 mol) parts by weight of oleic acid and 76.77 (0.83 mol) parts by weight of mercaptoacetic acid are uniformly mixed, then 29.97 parts by weight of 2-hydroxy-2-methyl-1-phenyl-1-propanone is added, the mixture is uniformly stirred, the obtained solution is placed in a photochemical reaction instrument, and irradiated with ultraviolet light of 365 nm wavelength at room temperature for 3 h to obtain the oleic acid-based dicarboxylic acid.

[0066] The second component-1 is self-made, and the preparation method is as follows: 390.58 (1 mol) parts by weight of ricin oil-based dicarboxylic acid is placed in a container at room temperature, stirred for 0.5 h, then 202.38 (2 mol) parts by weight of triethylamine is added dropwise, and stirring is continued for 1 h, after cooling to room temperature, 177.89 parts by weight of deionized water is added, and stirred uniformly to obtain the second component-1.

[0067] The second component-2 is self-made, and the preparation method is as follows: 390.58 (1 mol) parts by weight of ricin oil-based dicarboxylic acid is placed in a container at room temperature, 212.5 (2.1 mol) parts by weight of triethylamine is added dropwise under stirring, and stirring is continued for 0.5 h, after cooling to room temperature, 301.54 parts by weight of deionized water is added, and stirred uniformly to obtain the second component-2.

[0068] The second component-3 is self-made, and the preparation method is as follows: 374.58 (1 mol) parts by weight of oleic acid-based dicarboxylic acid is placed in a container at room temperature, stirred for 0.5 h, then 202.38 (2 mol) parts by weight of triethylamine is added dropwise, and stirring is continued for 1 h, after cooling to room temperature, 173.09 parts by weight of deionized water is added, and stirred uniformly to obtain the second component-3.

[0069] The second component-4 is self-made, and the preparation method is as follows: 390.58 (1 mol) parts by weight of castor oil-based dicarboxylic acid is placed in a container, stirred for 0.5 h, then 146.28 (2 mol) parts by weight of diethylamine is added dropwise, and stirring is continued for 1 h. After cooling to room temperature, 161.06 parts by weight of deionized water is added, and stirring is uniform, to obtain the second component-4.

[0070] Pearlescent powder: average particle size is 1-15 μm, Jiangmen Huaen Chemical Co., Ltd., Crystal Silk 8110;

[0071] Tetrafunctional waterborne polyurethane acrylate emulsion: Guangdong Lanke Road New Material Co., Ltd., L-9841W;

[0072] Tri-functional waterborne polyurethane acrylate emulsion: Guangzhou Wuxing Material Technology Co., Ltd., WU3602X;

[0073] Dual-functional waterborne polyurethane acrylate emulsion: Guangdong Lanke Road New Material Co., Ltd., L-9821W.

[0074] Leveling agent: BYK-333, BYK-Chemie;

[0075] Defoaming agent: BYK-024, BYK-Chemie;

[0076] Wetting agent: BYK-346, BYK-Chemie.

[0077] Example 1

[0078] The example provides a two-component waterborne ultraviolet curing paint, which comprises 100 parts by weight of a first component and 40 parts by weight of a second component-1.

[0079] The first component comprises the following components by weight: tetrafunctional waterborne polyurethane acrylate emulsion 50 parts, 2-hydroxy-2-methyl-1-phenyl-1-propanone 3 parts, pearlescent powder 8 parts, auxiliary agent 10 parts, color paste 3 parts, and water in balance, based on 100 parts by weight of the first component; wherein the auxiliary agent is composed of leveling agent 0.8 parts, defoaming agent 0.2 parts, wetting agent 2.5 parts, and matting powder 6.5 parts.

[0080] The example also provides a two-component waterborne ultraviolet curing paint and a preparation method of a waterborne ultraviolet coating, which comprises the following steps:

[0081] Preparation of the first component: the tetrafunctional waterborne polyurethane acrylate emulsion, 2-hydroxy-2-methyl-1-phenyl-1-propanone, pearlescent powder, auxiliary agent, color paste, and water are uniformly mixed to obtain the first component;

[0082] Preparation of the water-based ultraviolet light-cured coating: the first component and the second component-1 are mixed uniformly to obtain the water-based ultraviolet light coating;

[0083] Preparation of the water-based ultraviolet light coating: the water-based ultraviolet light coating is sprayed onto the plate of ABS+PC material by using a spray gun with a caliber of 1.5 mm, and the prepolymer is baked at 60℃ for 8 min, and then is irradiated by ultraviolet light with a wavelength of 365 nm at room temperature for 45 s to obtain the water-based ultraviolet light coating with a thickness of 15 μm.

[0084] Example 2

[0085] The embodiment provides a two-component water-based ultraviolet light-cured coating, which comprises 100 parts by weight of a first component and 40 parts by weight of a second component-2.

[0086] The first component comprises the following components in parts by weight: 90 parts of a tetrafunctional water-based polyurethane acrylate emulsion, 1 part of diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, 1 part of pearl powder, and the balance of water, with the parts by weight of the first component being 100.

[0087] The embodiment also provides a two-component water-based ultraviolet light-cured coating and a preparation method of a water-based ultraviolet light coating, which comprises the following steps:

[0088] Preparation of the first component: the tetrafunctional water-based polyurethane acrylate emulsion, 2-hydroxy-2-methyl-1-phenyl-1-propanone, pearl powder and water are uniformly mixed to obtain the first component;

[0089] Preparation of the water-based ultraviolet light-cured coating: the first component and the second component-2 are uniformly mixed to obtain the water-based ultraviolet light coating.

[0090] Preparation of the water-based ultraviolet light coating: the water-based ultraviolet light coating is sprayed onto the plate of ABS+PC material by using a spray gun with a caliber of 1.5 mm, and the prepolymer is baked at 50℃ for 15 min, and then is irradiated by ultraviolet light with a wavelength of 365 nm at room temperature for 30 s to obtain the water-based ultraviolet light coating with a thickness of 15.2 μm.

[0091] Example 3

[0092] The embodiment provides a two-component water-based ultraviolet light-cured coating, which comprises 100 parts by weight of a first component and 40 parts by weight of a second component-3.

[0093] The first component comprises the following components in parts by weight: 70 parts of a trifunctional water-based polyurethane acrylate emulsion, 5 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 10 parts of pearl powder, 5 parts of an additive, 5 parts of a color paste, and the balance of water, with the parts by weight of the first component being 100; wherein the additive is composed of 0.4 parts of a leveling agent, 0.1 part of a defoaming agent, 1.2 parts of a wetting agent, and 3.3 parts of a matting powder.

[0094] The embodiment also provides a two-component water-based ultraviolet curing coating and a preparation method of the water-based ultraviolet coating, which comprises the following steps:

[0095] Preparation of the first component: uniformly mix the tetrafunctional water-based polyurethane acrylate emulsion, 2-hydroxy-2-methyl-1-phenyl-1-propanone, pearl powder, auxiliary agent, color paste and water to obtain the first component;

[0096] Preparation of the water-based ultraviolet curing coating: uniformly mix the first component and the second component-3 to obtain the water-based ultraviolet coating;

[0097] Preparation of the water-based ultraviolet coating: the prepolymer is sprayed onto the plate of ABS+PC material by using a spray gun with a caliber of 1.5 mm, the plate is baked at 80 DEG C for 5 min, then the plate is irradiated by ultraviolet light with a wavelength of 365 nm at room temperature for 60 s, and thus the water-based ultraviolet coating with a thickness of 14.8 um is obtained.

[0098] Example 4

[0099] The embodiment provides a two-component water-based ultraviolet curing coating, and the difference between the two-component water-based ultraviolet curing coating of the embodiment and the two-component water-based ultraviolet curing coating of example 1 is that the weight part of the second component-1 is 10 parts.

[0100] The preparation method of the two-component water-based ultraviolet curing coating of the embodiment is the same as that of example 1.

[0101] The preparation method of the two-component water-based ultraviolet curing coating of the embodiment is the same as that of example 1.

[0102] Example 5

[0103] The embodiment provides a two-component water-based ultraviolet curing coating, and the difference between the two-component water-based ultraviolet curing coating of the embodiment and the two-component water-based ultraviolet curing coating of example 1 is that the weight part of the second component-1 is 20 parts.

[0104] The preparation method of the two-component water-based ultraviolet curing coating of the embodiment is the same as that of example 1.

[0105] The preparation method of the two-component water-based ultraviolet curing coating of the embodiment is the same as that of example 1.

[0106] Example 6

[0107] The embodiment provides a two-component water-based ultraviolet curing coating, and the difference between the two-component water-based ultraviolet curing coating of the embodiment and the two-component water-based ultraviolet curing coating of example 1 is that the weight part of the second component-1 is 30 parts.

[0108] The preparation method of the two-component water-based ultraviolet-curable coating of the embodiment is the same as that of Embodiment 1.

[0109] The preparation method of the two-component water-based ultraviolet-curable coating of the embodiment is the same as that of Embodiment 1.

[0110] Embodiment 7

[0111] The embodiment provides a two-component water-based ultraviolet-curable coating. The two-component water-based ultraviolet-curable coating of the embodiment is different from the two-component water-based ultraviolet-curable coating of Embodiment 1 only in that the composition of the first component is different. In the embodiment, the first component contains the following components in parts by weight based on 100 parts of the first component: 55 parts of a tetrafunctional water-based polyurethane acrylate emulsion, 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 8 parts of pearl powder, 10 parts of an auxiliary agent, 3 parts of a color paste, and the balance of water; wherein the auxiliary agent is composed of 0.8 parts of a leveling agent, 0.2 parts of a defoaming agent, 2.5 parts of a wetting agent, and 6.5 parts of a matting powder.

[0112] The preparation method of the two-component water-based ultraviolet-curable coating of the embodiment is the same as that of Embodiment 1.

[0113] The preparation method of the two-component water-based ultraviolet-curable coating of the embodiment is the same as that of Embodiment 1.

[0114] Embodiment 8

[0115] The embodiment provides a two-component water-based ultraviolet-curable coating. The two-component water-based ultraviolet-curable coating of the embodiment is different from the two-component water-based ultraviolet-curable coating of Embodiment 1 only in that the composition of the first component is different. In the embodiment, the first component contains the following components in parts by weight based on 100 parts of the first component: 55 parts of a tetrafunctional water-based polyurethane acrylate emulsion, 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 8 parts of pearl powder, 10 parts of an auxiliary agent, 3 parts of a color paste, and the balance of water; wherein the auxiliary agent is composed of 0.8 parts of a leveling agent, 0.2 parts of a defoaming agent, 2.5 parts of a wetting agent, and 6.5 parts of a matting powder.

[0116] The preparation method of the two-component water-based ultraviolet-curable coating of the embodiment is the same as that of Embodiment 1.

[0117] The preparation method of the two-component water-based ultraviolet-curable coating of the embodiment is the same as that of Embodiment 1.

[0118] Embodiment 9

[0119] The embodiment provides a two-component water-based ultraviolet curing paint, and the two-component water-based ultraviolet curing paint of the embodiment is different from the two-component water-based ultraviolet curing paint of embodiment 1 only in that the composition of the first component is different, and the two-component water-based ultraviolet curing paint of the embodiment contains the following components in parts by weight based on 100 parts of the first component: 75 parts of a tetrafunctional water-based polyurethane acrylate emulsion, 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 8 parts of pearl powder, 10 parts of an additive, 3 parts of a color paste, and the balance of water; wherein the additive is composed of 0.8 parts of a leveling agent, 0.2 parts of a defoaming agent, 2.5 parts of a wetting agent, and 6.5 parts of a matting powder.

[0120] The preparation method of the two-component water-based ultraviolet curing paint of the embodiment is the same as that of embodiment 1.

[0121] The preparation method of the two-component water-based ultraviolet curing paint of the embodiment is the same as that of embodiment 1.

[0122] Comparative example 1

[0123] The comparative example provides a two-component water-based ultraviolet curing paint, and the two-component water-based ultraviolet curing paint of the comparative example is different from the two-component water-based ultraviolet curing paint of embodiment 1 only in that the composition of the first component is different, and the two-component water-based ultraviolet curing paint of the comparative example contains the following components in parts by weight based on 100 parts of the first component: 40 parts of a tetrafunctional water-based polyurethane acrylate emulsion, 3 parts of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 8 parts of pearl powder, 10 parts of an additive, 3 parts of a color paste, and the balance of water; wherein the additive is composed of 0.8 parts of a leveling agent, 0.2 parts of a defoaming agent, 2.5 parts of a wetting agent, and 6.5 parts of a matting powder.

[0124] The preparation method of the two-component water-based ultraviolet curing paint of the comparative example is the same as that of embodiment 1.

[0125] The preparation method of the two-component water-based ultraviolet curing paint of the comparative example is the same as that of embodiment 1.

[0126] Comparative example 2

[0127] The comparative example provides a two-component water-based ultraviolet curing paint, and the two-component water-based ultraviolet curing paint of the comparative example is different from the two-component water-based ultraviolet curing paint of embodiment 2 only in that the composition of the first component is different, and the two-component water-based ultraviolet curing paint of the comparative example contains the following components in parts by weight based on 100 parts of the first component: 95 parts of a tetrafunctional water-based polyurethane acrylate emulsion, 1 part of 2-hydroxy-2-methyl-1-phenyl-1-propanone, 1 part of pearl powder, and the balance of water.

[0128] The preparation method of the two-component water-based ultraviolet curing paint of the comparative example is the same as that of embodiment 2.

[0129] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 2.

[0130] Comparative example 3

[0131] The comparative example provides a two-part waterborne UV-curable coating. The comparative example two-part waterborne UV-curable coating differs from the example 1 two-part waterborne UV-curable coating only in that the second component-1 is 5 parts by weight.

[0132] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 1.

[0133] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 1.

[0134] Comparative example 4

[0135] The comparative example provides a two-part waterborne UV-curable coating. The comparative example two-part waterborne UV-curable coating differs from the example 1 two-part waterborne UV-curable coating only in that the second component-1 is 50 parts by weight.

[0136] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 1.

[0137] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 1.

[0138] Comparative example 5

[0139] The comparative example provides a two-part waterborne UV-curable coating. The comparative example two-part waterborne UV-curable coating differs from the example 1 two-part waterborne UV-curable coating only in that the second component-1 is replaced by the second component-4.

[0140] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 1.

[0141] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 1.

[0142] Comparative example 6

[0143] The comparative example provides a two-part waterborne UV-curable coating. The comparative example two-part waterborne UV-curable coating differs from the example 1 two-part waterborne UV-curable coating only in that the four-functionality waterborne polyurethane acrylate emulsion is replaced by a two-functionality waterborne polyurethane acrylate emulsion in the first component.

[0144] The comparative example two-part waterborne UV-curable coating was prepared in the same manner as example 1.

[0145] The comparative example two-component water-based UV-curable coating was prepared by the same method as example 1.

[0146] Comparative example 7

[0147] The comparative example two-component water-based UV-curable coating was prepared by the same method as example 1, except that the baking temperature was 30°C.

[0148] Comparative example 8

[0149] The comparative example two-component water-based UV-curable coating was prepared by the same method as example 1, except that the baking temperature was 90°C.

[0150] The properties of the water-based UV-curable coatings obtained in examples 1-9 and comparative examples 1-8 were tested by the following methods.

[0151] (1) Pencil hardness: tested according to GB / T 6739-1996 standard;

[0152] (2) Tensile strength: the tensile strength of the UV-cured film was tested by a UTM5000 electronic universal testing machine, with a crosshead speed of 10 mm / min; the sample size was 20 mm x 10 mm x 0.15 mm;

[0153] (3) Flexibility: tested according to GB 1731-93 standard;

[0154] (4) Adhesion: tested according to ASTM D339-93B standard;

[0155] (5) Water resistance: the ABS+PC plate coated with the water-based UV-curable coating was immersed in 85°C water for 30 minutes, then taken out and observed for changes in the water-based UV-curable coating; the water resistance was determined by the number of bubbles generated in the water-based UV-curable coating, wherein 0 bubbles indicated excellent water resistance, 1-3 bubbles indicated good water resistance, 4-6 bubbles indicated moderate water resistance, and more than 7 bubbles indicated poor water resistance;

[0156] (6) Yellowing resistance: the water-based UV-curable coating was irradiated under sunlight for 15 days, and the change in b value of the coating was measured by a color difference meter; the higher the b value, the darker the yellow color of the coating, and the yellowing degree was represented by Δb; the smaller the Δb, the higher the yellowing resistance;

[0157] The test results are shown in Table 1.

[0158] Table 1

[0159]

[0160] From the experimental data of Table 1, it can be seen that the coating prepared from the two-component waterborne UV-curable coating of the present application has excellent roundness, mechanical properties, adhesion, water boiling resistance and yellowing resistance.

[0161] From the comparison of Example 1, Examples 7-9 and Comparative Examples 1-2, it can be seen that the weight fraction of the waterborne polyurethane acrylate emulsion affects the performance of the waterborne UV-curable coating. When the weight fraction of the waterborne polyurethane acrylate emulsion is less than 40 parts, the mechanical properties of the waterborne UV-curable coating decrease. When the weight fraction of the waterborne polyurethane acrylate emulsion is greater than 90 parts, the yellowing resistance and mechanical properties of the waterborne UV-curable coating decrease. When the weight fraction of the waterborne polyurethane acrylate emulsion is 55-70 parts, the comprehensive performance of the obtained waterborne UV-curable coating is higher.

[0162] From the comparison of Example 1, Examples 4-6 and Comparative Examples 3-4, it can be seen that the amount of the second component affects the performance of the waterborne UV-curable coating. When the weight fraction of the second component is less than 10 parts, the yellowing resistance of the waterborne UV-curable coating decreases. When the weight fraction of the second component is greater than 40 parts, the pencil hardness, tensile strength and water boiling resistance of the waterborne UV-curable coating decrease significantly. When the weight fraction of the second component is 20-30 parts, the comprehensive performance of the obtained waterborne UV-curable coating is higher.

[0163] From the comparison of Example 1 and Comparative Examples 7-8, it can be seen that the baking temperature affects the performance of the waterborne UV-curable coating. When the baking temperature is too high or too low, the pencil hardness, tensile strength and water boiling resistance of the waterborne UV-curable coating decrease.

[0164] Finally, it should be noted that the above examples are used to illustrate the technical solutions of the present disclosure and are not a limitation on the protection scope of the present disclosure. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present disclosure.

Claims

1. A two-component waterborne UV-curable coating, characterized in that, The two-component water-based ultraviolet light-cured coating comprises 100 parts by weight of a first component and 10-40 parts by weight of a second component; The first component comprises the following components by weight: 50-90 parts of a water-based polyurethane acrylate emulsion, 1-5 parts of a first photoinitiator, 1-10 parts of pearl powder, and 1-50 parts of water, based on 100 parts by weight of the first component; wherein the functionality of the water-based polyurethane acrylate emulsion is ≥ 3; The second component comprises a reaction product or mixture of a vegetable oil-based dicarboxylic acid, triethylamine, and water; wherein the molar ratio of the vegetable oil-based dicarboxylic acid to triethylamine is 1:(2-2.10), and the mass of water is 30-50% of the total mass of the vegetable oil-based dicarboxylic acid and triethylamine; The preparation method of the vegetable oil-based dicarboxylic acid comprises mixing vegetable oil acid, mercaptoacetic acid, and a second photoinitiator to perform photochemical reaction to obtain the vegetable oil-based dicarboxylic acid; The molar ratio of the vegetable oil acid to mercaptoacetic acid is (1-1.20):1, and the mass of the second photoinitiator is 3-8% of the total mass of the vegetable oil acid and mercaptoacetic acid.

2. The two-component waterborne UV-curable coating according to claim 1, characterized in that, The parts by weight of the second component is 20-30 parts.

3. The two-component waterborne UV-curable coating according to claim 1, characterized in that, The parts by weight of the water-based polyurethane acrylate emulsion is 55-75 parts.

4. The two-component waterborne UV-curable coating according to claim 1, characterized in that, The vegetable oil acid is at least one of ricinoleic acid, oleic acid, tung oil acid, linoleic acid, linoleic acid, and erucic acid; and the second photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone.

5. The two-component waterborne UV-curable coating as described in claim 1, characterized in that, The first component further comprises 0.01-5 parts by weight of a color paste and 0.01-10 parts by weight of an auxiliary agent; the auxiliary agent is at least one of a leveling agent, a defoaming agent, a wetting agent, and a matting powder.

6. The two-component waterborne UV-curable coating as described in claim 1, characterized in that, The first photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenyl-1-propanone, diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, 1-hydroxycyclohexyl phenyl ketone, and phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide.

7. Use of the two-component water-based ultraviolet light-cured coating according to any one of claims 1-6 for coating a substrate.

8. A coating characterized in that, The coating is obtained by heat treatment and light curing of the two-component water-based ultraviolet light-cured coating according to any one of claims 1-6, wherein the temperature of the heat treatment is 50-80°C.

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