Cover plate integrated black ink as well as preparation method and color matching method thereof

Abstract

The invention discloses cover plate integrated black ink as well as a preparation method and a color matching method thereof. The integrated black ink comprises the following raw materials: hydroxy acrylic resin I, a filler I, carbon black and a coupling agent, wherein the weight-average molecular weight of the hydroxy acrylic resin I is 40 to 50 kDa. The invention relates to a preparation and toning method of integrated black ink, and the ink can control the color difference between a cover plate frame and a display screen area at an extremely low level to realize a uniform integrated black visual effect. The color regulation and control range covers that the L value is 26 to 29.5, the a value is-0.73 to + 1.92, and the b value is-0.93 to + 1.93. According to the scheme, the common technical problems in black toning are solved, and the problems that a traditional coating is prone to greying and poor in weather resistance and light resistance are also remarkably solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ink, in particular to a cover plate integrated black ink, a preparation method thereof and a color matching method. BACKGROUND

[0002] In the field of 3C electronics and automobiles, display screens have become an important interface for human-computer interaction. With the increasing demand for aesthetic display effects, the demand for visual integration between electronic screens and cover plates is increasingly prominent and gradually becoming an industry standard configuration. Compared with the traditional "large black border" design, using cover plate color matching ink that matches the color of the screen display area can achieve a more coordinated "integrated black" visual effect.

[0003] Although the existing technology has the ability to regulate the L, a, and b values of black ink, compared with the present technology, there are still many problems: for example, according to the scheme of a high L value black ink for realizing integrated black effect and a preparation method thereof disclosed in Chinese patent CN114736559B, the color adjustment range of the existing technology is narrow, and the regulation ability of a and b values is limited. In addition, under the condition of high L value, due to the excessive use of fillers such as carbon black, it is easy to cause the mechanical properties of the paint film to decrease, the toughness to be insufficient, and the brittleness to increase, which is specifically manifested as poor hatch test results and unstable performance of high L value ink. For example, according to the color matching method of an ink for an integrated black display cover plate disclosed in Chinese patent CN116535894A, some color pigments (such as azo and benzimidazolone pigments containing azo structure) in the existing technology have poor temperature resistance and light resistance. At the same time, these pigments generally have insufficient transparency, causing the black ink after color matching to present a gray tone, which seriously affects the integration effect and the appearance of the paint film.

[0004] Therefore, it is of great significance to develop a new cover plate integrated black ink and a color matching method thereof. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a cover plate integrated black ink, which has an L value covering 26-29.5 and excellent adhesion.

[0006] The present application also proposes a color matching method of the above-mentioned cover plate integrated black ink.

[0007] According to one aspect of the present application, a cover plate integrated black ink is proposed, which comprises the following raw materials: hydroxy acrylic resin I, filler I, carbon black, and coupling agent; wherein the weight average molecular weight of the hydroxy acrylic resin is 40-50 kDa.

[0008] According to some embodiments of the present application, the integral black ink comprises raw materials in the following proportions by weight: hydroxyl acrylic resin I 40-60 parts, filler I 2-5 parts, carbon black 20-35 parts, coupling agent 1-3 parts.

[0009] According to some embodiments of the present application, the integral black ink further comprises the following raw materials: diluent I, dispersant I and defoaming agent I.

[0010] According to some embodiments of the present application, the integral black ink further comprises the following raw materials: curing agent I and organic solvent I.

[0011] According to some embodiments of the present application, the integral black ink further comprises the following raw materials in the following proportions by weight: diluent I 10-20 parts, dispersant I 2-6 parts, defoaming agent I 0.5-1.5 parts, wherein the weight represented by each part weight is the same as that of other raw materials.

[0012] According to some embodiments of the present application, the theoretical hydroxyl value of the hydroxyl acrylic resin I is 30-36 mgKOH / g.

[0013] According to some embodiments of the present application, the solid content of the hydroxyl acrylic resin I is 60±3%.

[0014] According to some embodiments of the present application, the average particle size of the carbon black is 20-30 nm, and the pH is 2-3. The carbon black with small particle size has weak diffuse reflection at different angles, and the color consistency of the paint film at different angles is good, the black color is deep and not gray.

[0015] According to some embodiments of the present application, the organic solvent I and the diluent I each independently comprises at least one of divalent acid ester or isophorone. The main function of the organic solvent and the diluent is mainly to adjust the viscosity.

[0016] According to some embodiments of the present application, the filler I is selected from at least one of barium sulfate or talc powder.

[0017] According to some embodiments of the present application, the mesh number of the filler I is 4000-6000 mesh. For example, 5000 mesh.

[0018] According to some embodiments of the present application, the coupling agent is selected from at least one of 3-aminopropyltrimethoxysilane, 3-(1,3-dimethylbutene) aminopropyl triethoxysilane, N,N-diethyl-3-aminopropyltrimethoxysilane or N-2-aminoethyl-3-aminopropyltrimethoxysilane. The coupling agent belongs to the active ingredient, which promotes the reaction to occur.

[0019] According to some embodiments of the present application, the defoaming agent I comprises at least one of BYK054 or polyolefin-based silicone-free defoaming agent.

[0020] According to some embodiments of the present application, the curing agent I is an isocyanate curing agent.

[0021] According to some embodiments of the present application, the one-piece black ink comprises raw materials in the following proportions by weight: 40-60 parts of hydroxyl acrylic resin, 10-20 parts of diluent, 2-4 parts of filler, 20-35 parts of carbon black, 1-3 parts of coupling agent, 3-6 parts of dispersant, and 0.5-1 part of defoaming agent.

[0022] According to some embodiments of the present application, the one-piece black ink comprises raw materials in the following proportions by weight: 40-60 parts of hydroxyl acrylic resin, 10-15 parts of diluent, 2-4 parts of filler, 20-35 parts of carbon black, 1-3 parts of coupling agent, 3-6 parts of dispersant, and 0.5-1 part of defoaming agent.

[0023] According to some embodiments of the present application, the one-piece black ink comprises raw materials in the following proportions by weight: 60 parts of hydroxyl acrylic resin, 10 parts of diluent, 4 parts of filler, 20 parts of carbon black, 2 parts of coupling agent, 3 parts of dispersant, and 1 part of defoaming agent.

[0024] According to some embodiments of the present application, the one-piece black ink comprises raw materials in the following proportions by weight: 55 parts of hydroxyl acrylic resin, 10 parts of diluent, 4 parts of filler, 25 parts of carbon black, 2 parts of coupling agent, 3 parts of dispersant, and 1 part of defoaming agent.

[0025] According to some embodiments of the present application, the one-piece black ink comprises raw materials in the following proportions by weight: 40 parts of hydroxyl acrylic resin, 15 parts of diluent, 4 parts of filler, 35 parts of carbon black, 2 parts of coupling agent, 3 parts of dispersant, and 1 part of defoaming agent.

[0026] According to some embodiments of the present application, the substrate of the cover plate is selected from at least one of the following: aluminum-silicon glass, soda-lime glass, coated glass, or transparent polymer (such as PMMA and the like) plate.

[0027] According to another aspect of the present application, a preparation method of the above-mentioned one-piece black ink for cover plate is also provided, comprising the following steps: S1, adding hydroxyl acrylic resin, part of diluent, dispersant, filler, and carbon black into a container, mixing to obtain an initial mixed ink; S2, grinding the initial mixed ink at 25-30°C to a fineness of less than 5 μm to obtain an intermediate ink; S3, adding coupling agent, defoaming agent, and the remaining diluent to the intermediate ink, dispersing to obtain a finished one-piece black ink.

[0028] According to some embodiments of the present application, the part of diluent accounts for 70-80% of the total amount of diluent.

[0029] According to some embodiments of the present application, the step S1 is performed under constant temperature and humidity conditions, including a temperature of 25±2℃ and a humidity of 50±10%.

[0030] According to some embodiments of the present application, the mixing is performed under stirring at a speed of 800-1200 rpm for 15-20 minutes.

[0031] According to some embodiments of the present application, the dispersing is performed under dispersing at a speed of 500-800 rpm for 15-20 minutes.

[0032] According to another aspect of the present application, a method for toning a cover plate integrated black ink is provided, comprising the following steps: preparing the integrated black ink as described above; dispersing a color pigment or a color paste containing the color pigment into the integrated black ink, and obtaining the toning product.

[0033] According to some embodiments of the present application, the color pigment comprises at least one of quinacridone pigments, phthalocyanine blue pigments, transparent iron red pigments, perylene pigments (179), anthraquinone blue pigments (6520) and dioxazine pigments (5700).

[0034] According to some embodiments of the present application, the color pigment comprises at least one of quinacridone pigments P.B 122, phthalocyanine blue pigments P.B 15:3, phthalocyanine blue pigments P.B 15:1, transparent iron red pigments, perylene pigments P.R 179, anthraquinone blue pigments P.B 60 and dioxazine pigments P.V 37.

[0035] According to some embodiments of the present application, the color paste comprises the following raw materials by weight: hydroxyacrylic resin II 40-70 parts, filler II 2-5 parts and color pigment II 20-35 parts.

[0036] According to some embodiments of the present application, the color paste further comprises the following raw materials: diluent II, dispersant II and defoaming agent II.

[0037] According to some embodiments of the present application, the color paste further comprises the following raw materials: curing agent II and organic solvent II.

[0038] According to some embodiments of the present application, the color paste further comprises the following raw materials by weight: diluent II 10-20 parts, dispersant II 2-6 parts, defoaming agent II 0.5-1.5 parts, wherein the weight represented by each part weight is the same as that of other raw materials.

[0039] According to some embodiments of the present application, the mass ratio of the color paste to the one-piece black ink is 0.8-1.2:1.

[0040] According to some embodiments of the present application, the color-forming concentration of the color ink in the color paste is 20-35%.

[0041] According to some embodiments of the present application, the theoretical hydroxyl value of the hydroxyl acrylic resin II is 30-36 mgKOH / g.

[0042] According to some embodiments of the present application, the solid content of the hydroxyl acrylic resin II is 60±3%.

[0043] According to some embodiments of the present application, the organic solvent II and the diluent II each independently comprises at least one of a divalent acid ester or isophorone.

[0044] According to some embodiments of the present application, the filler II is selected from at least one of barium sulfate or talc powder.

[0045] According to some embodiments of the present application, the mesh number of the filler II is 4000-6000 mesh. As 5000 mesh.

[0046] According to some embodiments of the present application, the defoaming agent II comprises at least one of BYK054 or a polyolefin-based silicon-free defoaming agent.

[0047] According to some embodiments of the present application, the curing agent II is an isocyanate curing agent.

[0048] According to some embodiments of the present application, the preparation method of the color paste comprises the following steps: S01, the hydroxyl acrylic resin II, part of the diluent II, the dispersant II, the filler II and the color pigment are added into a container, mixed to obtain an initial mixed color paste; S02, the initial mixed color paste is ground at 25-30℃ to a fineness of 5μm or less to obtain an intermediate color paste; S03, the defoaming agent II and the remaining diluent II are added to the intermediate color paste and dispersed to obtain the color paste.

[0049] According to some embodiments of the present application, the part of the diluent II accounts for 70-80% of the total amount of the diluent II.

[0050] According to some embodiments of the present application, the step S01 is carried out under constant temperature and humidity conditions, and the constant temperature and humidity conditions include a temperature of 25±2℃ and a humidity of 50±10%.

[0051] According to some embodiments of the present application, the mixing in step S01 is stirring at a speed of 800-1200 rpm for 15-20 minutes.

[0052] According to some embodiments of the present application, the dispersion in step S03 is dispersion at a speed of 500-800 rpm for 15-20 minutes.

[0053] According to some embodiments of the present application, the ink parameters after toning include: L value of 26-29.5, a value of -0.73~+1.92, b value of -0.93~+1.93.

[0054] Compared with the prior art, the present application has at least the following beneficial effects: The present application relates to a preparation and toning method of an integrated black ink, which can control the color difference between the cover plate frame and the display screen area at a very low level, and realize the uniform integrated black visual effect. The color control range covers L value of 26-29.5, a value of -0.73~+1.92, b value of -0.93~+1.93. The scheme not only solves the common technical problems in black toning, but also significantly improves the problems of easy greying, insufficient weather resistance and light resistance of traditional coatings.

[0055] In the ink toning process, the initial black ink is used as the basis, and specific color pigments or corresponding color paste are added for toning. The selected color pigments include quinacridone, phthalocyanine blue, transparent iron red, perylene pigment, anthraquinone blue and dioxazine, etc. These pigments have excellent color stability and optical properties. By selecting high transparent or semi-transparent color pigments and based on the selective spectrum adjustment principle, the a value and b value can be accurately controlled. At the same time, the formula effectively improves the weather resistance and light resistance of the ink, avoids the color greying phenomenon, and thus ensures excellent integrated black effect during long-term use.

[0056] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be learned by practice of the present application. DETAILED DESCRIPTION

[0057] The concept and the technical effects of the present application will be described clearly and completely in combination with the embodiments below, so as to fully understand the objects, features and effects of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application. The test methods used in the embodiments are conventional methods unless otherwise specified. The materials, reagents and the like used are commercially available unless otherwise specified. The same parameters have the same values in each embodiment unless otherwise specified. The following described embodiments are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0058] In the description of the present application, the description of the terms "some embodiments" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] In the description of the present application, I and II are only for easy distinction, and are not limited otherwise. The two types of components can be the same or different.

[0060] Unless otherwise specified, the concentration referred to in the present application is the mass concentration.

[0061] The types and source information of the raw materials used in the following examples and comparative examples are described as follows: The hydroxyl acrylic resin used in the examples has a theoretical hydroxyl value of 30-36 mgKOH / g, a weight average molecular weight of 47835 Da, and a solid content of 60±3%, and the remaining part is solvent-isoforone, which is purchased from Nakamura Chemical. The hydroxyl acrylic resin used in the comparative examples differs in solid content or weight average molecular weight, and the specific data is referred to. If not otherwise specified, the same components as the raw materials in the examples are used. The resins are purchased from Nakamura Chemical.

[0062] The organic solvent or diluent is a divalent acid ester, which is purchased from Shandong Qiyun Chemical.

[0063] The filler is talcum powder, 5000 mesh, soft in texture, fine in particle, which is helpful for the dispersion of carbon black and the adhesion of paint film, and is purchased from Housheng Chemical.

[0064] The average primary particle size of the carbon black is 24 nm, and the pH value is 2.5, which has the characteristics of high blackness, strong tinting strength and low oil absorption, and is purchased from Oerlikon.

[0065] The coupling agent is 3-aminopropyltrimethoxysilane, which is purchased from Nanjing Nengxin New Materials.

[0066] The dispersant is a high molecular weight acrylic dispersant with an amine value of 20 mgKOH / g, model EFKA PX4310, purchased from BASF Chemicals.

[0067] The defoaming agent is BYK054, a polyolefin-based silicone-free defoaming agent suitable for defoaming and defoaming of high viscosity systems.

[0068] The curing agent is an isocyanate curing agent, model N3300, purchased from Covestro.

[0069] Example 1 This example provides a cover plate integrated black ink. The integrated black ink is prepared from the following ingredients: 60 parts (Mw=47835 Da) of hydroxyl acrylic resin, 10 parts of diluent, 4 parts of filler, 20 parts of carbon black, 2 parts of coupling agent, 3 parts of dispersant, 1 part of defoaming agent, 10 parts of organic solvent and 10 parts of curing agent.

[0070] The specific preparation process is as follows: Step 1: Under constant temperature and humidity conditions (temperature 25±2°C, humidity 50±10%), add hydroxyl acrylic resin, 3 / 4 of diluent, dispersant, filler and carbon black to a clean, appropriately sized ink container in sequence, and disperse and stir at a low speed of 1100 rpm for 15 minutes to obtain an initial mixed ink; Step 2: Grind the initial mixed ink in a three-roll mill at 26°C, control the fineness of the ink to be less than or equal to 5μm (≤5μm), and obtain a ground and uniformly dispersed intermediate ink; Step 3: Add coupling agent, defoaming agent and the remaining 1 / 4 of diluent to the dispersed ink, and disperse at a low speed of 700 rpm for 15 minutes to obtain an integrated black ink; Step 4: Under constant temperature and humidity conditions (temperature 25±2°C, humidity 50±10%), take the integrated black ink, add curing agent and organic solvent, and stir at a low speed of 700 rpm for 15 minutes to obtain a uniformly mixed integrated black ink.

[0071] Example 2 This example provides a cover plate integrated black ink. The difference between this example and Example 1 is that the hydroxyl acrylic resin is 55 parts, the diluent is 10 parts, the filler is 4 parts, the carbon black is 25 parts, the coupling agent is 2 parts, the dispersant is 3 parts, the defoaming agent is 1 part, the organic solvent is 10 parts and the curing agent is 10 parts.

[0072] Example 3 The example provides a cover plate integrated black ink. The difference from example 1 is that the weight average molecular weight of the hydroxyl acrylic resin is 57638 Da and the solid content is 50±3%.

[0073] Comparative example 1 The example provides a cover plate integrated black ink. The difference from example 3 is that the weight average molecular weight of the hydroxyl acrylic resin is 57638 Da and the solid content is 50±3%.

[0074] Comparative example 2 The example provides a cover plate integrated black ink. The difference from example 3 is that the weight average molecular weight of the hydroxyl acrylic resin is 57638 Da and the solid content is 50±3%.

[0075] Comparative example 3 The example provides a cover plate integrated black ink. The difference from example 3 is that the weight average molecular weight of the hydroxyl acrylic resin is 57638 Da and the solid content is 50±3%.

[0076] The ink prepared in the above examples and comparative examples is screen printed on a soda-lime glass white plate using a 350 mesh screen, and then baked and cured in an oven at 150°C for 30 minutes. After cooling, a sample with a coating film thickness of 6±1 microns on the glass is obtained. The color data of the finished product is tested from the glass side of the sample plate using a color difference meter. The L value, a value and b value of the black ink are tested using the color difference meter. The color difference meter used is CM-700D from Konica Minolta, with an aperture of SAV (3-5mm), and the test mode includes SCI and SCE modes. The test results of examples 1-3 are shown in Table 1 below.

[0077] Table 1

[0078] As can be seen from the above table, the ink formula of the present application can effectively adjust the L value of the black ink, and the adjustment range of the L value is 26.0-29.5.

[0079] The ink prepared in examples 1-3 and comparative examples 1-3 is subjected to a hundred grid test and a hundred grid test under water boiling conditions. The results are shown in Table 2 below.

[0080] Table 2

[0081] The hundred grid test is tested according to the 1mm grid plate. The resin molecular weight in comparative example 3 is too high, the viscosity rises, and the solid content decreases.

[0082] As can be seen from the above table, the resin with the weight average molecular weight level according to the present application has excellent adhesion verified by the crosshatch test even under the condition of high carbon black addition. When the molecular weight of the resin is too high or too low, the adhesion of the ink is significantly reduced.

[0083] Example 4 This example provides a color ink. The difference from Example 1 is that 57 parts of hydroxyl acrylic resin II (the same as hydroxyl acrylic resin I in Example 1), 10 parts of diluent, 4 parts of filler, 25 parts of color pigment (quinacridone pigment P.R122), 3 parts of dispersant, 1 part of defoaming agent, 20 parts of organic solvent and 20 parts of curing agent are used.

[0084] Preparation process of the color ink: Step 1: under constant temperature and humidity conditions (temperature 25±2°C, humidity 50±10%), hydroxyl acrylic resin, ¾ of diluent, dispersant, filler and color pigment are sequentially added into a clean and suitable size ink container, and are dispersed and stirred at a low speed of 1100 rpm for 15 minutes by using a disperser to obtain an initial color ink; Step 2: the initial mixed color ink is ground in a three-roll mill at 26°C, and the fineness of the ink is controlled to be less than or equal to 5 μm (≤5 μm) to obtain a color ink with uniform grinding and dispersion; Step 3: defoaming agent and the remaining ¼ of diluent are added into the color ink, and are dispersed at a low speed of 700 rpm for 15 minutes by using a disperser to obtain a semi-finished color ink.

[0085] Step 4: under constant temperature and humidity conditions (temperature 25±2°C, humidity 50±10%), the one-body black ink and the color ink prepared in Example 3 are weighed according to a weight ratio of 1:1, and curing agent and organic solvent are added, and are stirred at a low speed of 700 rpm for 15 minutes by using a disperser to obtain a mixed color ink with uniform mixing.

[0086] Screen printing is performed on a soda-lime glass white plate using a 350 mesh screen, and the sample is taken out and cooled after being baked and cured in an oven at 150°C for 30 minutes to obtain a sample with a coating film thickness of 6±1 μm on the glass. The color data is tested and collected from the glass surface of the sample plate using the same color difference meter as used in the foregoing test process. The results show that the L value is 28.65, the a value is -0.38 and the b value is 1.88 in SCI mode, and the L value is 3.29, the a value is 1.05 and the b value is -0.78 in SCE mode.

[0087] Example 5 This example provides a color ink. The difference from Example 4 is that the color pigment is phthalocyanine blue pigment P.B 15:3. The color data test results are as follows: in SCI mode, the L value is 2696, the a value is 1.23, and the b value is -0.80. In SCE mode, the L value is 3.17, the a value is -0.14, and the b value is -0.88.

[0088] Example 6 This example provides a color ink. The difference from Example 4 is that the color pigment is phthalocyanine blue pigment P.B 15:1. The color data test results are as follows: in SCI mode, the L value is 27.15, the a value is 1.92, and the b value is -0.26. In SCE mode, the L value is 2.83, the a value is -1.24, and the b value is -1.78.

[0089] Example 7 This example provides a color ink. The difference from Example 4 is that the color pigment is transparent iron red pigment iron oxide. The color data test results are as follows: in SCI mode, the L value is 27.25, the a value is -0.12, and the b value is -0.93. In SCE mode, the L value is 2.74, the a value is 0.01, and the b value is -0.77.

[0090] Example 8 This example provides a color ink. The difference from Example 4 is that the color pigment is perylene pigment P.R 179. The color data test results are as follows: in SCI mode, the L value is 26.91, the a value is -0.16, and the b value is -0.74. In SCE mode, the L value is 2.60, the a value is 0.95, and the b value is -1.54.

[0091] Example 9 This example provides a color ink. The difference from Example 4 is that the color pigment is anthraquinone blue pigment P.B 60. The color data test results are as follows: in SCI mode, the L value is 27.36, the a value is 1.21, and the b value is 0.95. In SCE mode, the L value is 2.83, the a value is -1.24, and the b value is -1.78.

[0092] Example 10 This example provides a color ink. The difference from Example 4 is that the color pigment is dioxazine pigment P.V 37. The color data test results are as follows: in SCI mode, the L value is 28.25, the a value is -0.73, and the b value is 1.93. In SCE mode, the L value is 3.63, the a value is -0.69, and the b value is -1.19.

[0093] Comparative Example 4 The example provides a color ink. The difference from example 4 is that the color pigment is single azo pigment P.R 57:1.

[0094] The color data of the finished products in examples 4-10 and comparative example 4 are tested and collected from the glass surface of the sample board, as shown in Table 3 below. Further, the stability of the ink is also tested by QUV light aging test (test conditions are as follows: 420 nm, 1.2 W / m 2 , temperature 60℃, humidity 50%RH, 1000 hours).

[0095] Table 3

[0096] As can be seen from the above table, the color ink of the present application scheme realizes effective adjustment of the a and b values of the black ink, and the coverage range is as follows: a value -0.73~+1.92, b value -0.93~+1.93. Compared with the prior art, the present application scheme uses transparent or semi-transparent color pigments to adjust and filter the color, so that the coating reflects a specific spectrum of light, so as to realize the adjustment of the a and b values of the black ink. In order to realize strong adjustment of the color of the black ink in the prior art, high-hiding color pigments are used, which causes the black ink after color adjustment to be gray, which seriously reduces the integration effect and appearance of the paint film. The present application scheme uses the following color pigments: quinacridone pigments, phthalocyanine blue pigments, transparent iron red pigments, perylene pigments, anthraquinone blue pigments and dioxazine pigments, etc., which effectively improve the stability of the ink while avoiding the problem of gray color, and realize excellent integration effect.

[0097] The light absorption rate (0~100%, wherein 0% represents absorption of all light, and 100% represents no absorption of any light) of the ink in examples 3-10 and comparative example 4 in the wavelength range of 340nm~740nm is tested by CM-3700A, the aperture is SAV (3~5mm), and the test is from the glass surface. The average light absorption rate in this wavelength range is taken. The results are shown in Table 4 below.

[0098] Table 4

[0099] As can be seen from the above table, the samples of the present application examples are not gray and have good consistency, while the samples of the comparative example scheme are gray and foggy. The light absorption rate of the gray sample in the visible light wavelength range is high, reaching 1.53%. It is quite different from the initial black ink.

[0100] The above has made a detailed description of the embodiments of the present application, but the present application is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A cover integrated black ink, characterized by: The one-body black ink comprises the following raw materials: a hydroxyl acrylic resin I, a filler I, carbon black, and a coupling agent; wherein the weight average molecular weight of the hydroxyl acrylic resin is 40-50 kDa.

2. The cover plate integrated black ink according to claim 1, characterized by: The one-body black ink further comprises the following raw materials: the theoretical hydroxyl value of the hydroxyl acrylic resin I is 30-36 mgKOH / g; and / or, the solid content of the hydroxyl acrylic resin I is 60±3%.

3. The cover plate integrated black ink according to claim 1, characterized by: The average particle size of the carbon black is 20-30 nm, and the pH is 2-3.

4. The cover plate integrated black ink according to claim 1, characterized by: The one-body black ink comprises the following raw materials in parts by weight: the hydroxyl acrylic resin I 40-60 parts, the filler I 2-5 parts, the carbon black 20-35 parts, and the coupling agent 1-3 parts; and / or, the one-body black ink further comprises the following raw materials: a diluent I, a dispersant I, and an antifoaming agent I.

5. The cover plate integrated black ink according to claim 1, wherein: The one-body black ink comprises the following raw materials in parts by weight: the hydroxyl acrylic resin 40-60 parts, the diluent 10-20 parts, the filler 2-4 parts, the carbon black 20-35 parts, the coupling agent 1-3 parts, the dispersant 3-6 parts, and the antifoaming agent 0.5-1 part.

6. The method for preparing the integrated black ink for the cover plate according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1, adding the hydroxyl acrylic resin, part of the diluent, the dispersant, the filler, and the carbon black into a container, mixing to obtain an initial mixed ink; S2, grinding the initial mixed ink at 25-30°C to a fineness of less than 5 μm to obtain an intermediate ink; S3, adding the coupling agent, the antifoaming agent, and the remaining diluent to the intermediate ink, dispersing to obtain a finished one-body black ink.

7. The method for preparing the integrated black ink for the cover plate according to claim 6, characterized in that: The mixing is stirring at a speed of 800-1200 rpm for 15-20 minutes; and / or, the dispersing is dispersing at a speed of 500-800 rpm for 15-20 minutes.

8. A method for toning a cover plate integrated black ink, characterized by: The method comprises the following steps: Preparation of the one-body black ink according to any one of claims 1 to 5; Dispersing a color pigment or a color paste containing the color pigment into the one-body black ink to obtain the color ink.

9. The toning method according to claim 8, characterized in that: The color pigment comprises at least one of quinacridone pigments, phthalocyanine blue pigments, transparent iron red pigments, perylene pigments (179), anthraquinone blue pigments (6520), and dioxazine pigments (5700).

10. The toning method according to claim 8, characterized in that: The color pigment comprises at least one of quinacridone pigment P.B 122, phthalocyanine blue pigment P.B 15:3, phthalocyanine blue pigment P.B 15:1, transparent iron red pigment, perylene pigment P.R 179, anthraquinone blue pigment P.B 60, and dioxazine pigment P.V 37; and / or, the ink parameter after toning comprises: L value 26-29.5, a value -0.73 to +1.92, and b value -0.93 to +1.93.

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