Ceramic ink as well as preparation method and application thereof

Abstract

The invention discloses ceramic ink and a preparation method and application thereof, and relates to the technical field of ceramic ink. The ceramic ink comprises the following components in parts by mass: 30-43 parts of an inorganic pigment, 35-60 parts of an ester organic solvent, 3-5 parts of a ketone organic solvent and 2-7 parts of a first auxiliary agent, the molecular weight of the ester organic solvent is 200 to 400 g / mol; the molecular weight of the ketone organic solvent is 50 to 150 g / mol; the first auxiliary agent is a dispersing agent, and the dispersing agent comprises a first dispersing agent with the molecular weight of 800-1200 g / mol. The ceramic ink provided by the invention has good hydrophilicity and permeability, the water-based glaze can be uniformly spread on an ink layer formed by the ceramic ink, and the problem of interface repulsion between the existing oily ceramic ink and the water-based glaze is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of ceramic inks, and more particularly to a ceramic ink, its preparation method, and its application. Background Technology

[0002] Currently, mainstream ceramic inks are made using organic solvents as a medium, exhibiting significant oil-based characteristics. In the production process of architectural ceramic tiles, when a certain amount of oil-based ceramic ink is sprayed onto the glaze surface, and then water-based glaze is applied, the two repel each other. This prevents the water-based glaze from spreading evenly and fully on the surface, resulting in defects such as pitting, unevenness, and roughness after drying. Especially for large areas of dark-colored and black polished glazed tiles, if the polished surface is uneven, deeper polishing is required, which can easily lead to defects such as polishing stains, yellowing edges, and over-polishing of decorative patterns. In areas of dark color, polishing can also result in pitted defects in the dark patterned areas, affecting the overall flatness and smoothness of the product.

[0003] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0004] Based on the shortcomings of the prior art, the purpose of this invention is to provide a ceramic ink and its preparation method and application, aiming to solve the problem that existing ceramic inks have significant oily characteristics. When a certain amount of oily ceramic ink is sprayed onto the glaze surface, and then water-based glaze is applied to the surface, the two will repel each other, causing the water-based glaze to be unable to spread evenly on the surface, resulting in defects such as pitted surface, crater, and uneven glaze surface after drying.

[0005] The technical solution of the present invention is as follows: In a first aspect, the present invention provides a ceramic ink, wherein, by weight, the ceramic ink comprises the following components: 30-43 parts of inorganic pigment, 35-60 parts of ester organic solvent, 3-5 parts of ketone organic solvent, and 2-7 parts of first auxiliary agent; The molecular weight of the ester organic solvent is 200~400 g / mol; The molecular weight of the ketone organic solvent is 50~150 g / mol; The first adjuvant is a dispersant, and the dispersant includes a first dispersant with a molecular weight of 800~1200 g / mol.

[0006] Optionally, the ester organic solvent includes at least one of isopropyl lauryl acetate, isooctyl palmitate, and dioctyl adipate; Optionally, the ketone organic solvent includes at least one of acetone, butanone, methyl isobutyl ketone, cyclohexanone, and isophorone.

[0007] Optionally, the dispersant further includes a second dispersant, the second dispersant comprising a silane coupling agent; and / or, The first dispersant includes solvent-based phosphate ester dispersants.

[0008] Optionally, the ester organic solvent includes isooctyl palmitate and dioctyl adipate, wherein the mass ratio of isooctyl palmitate to dioctyl adipate is (3~6):1.

[0009] Optionally, the ceramic ink further includes 1 to 3 parts by weight of a second additive; The second additive includes at least one of a thickener and a penetration enhancer.

[0010] A second aspect of the present invention provides a method for preparing the ceramic ink of the present invention as described above, comprising the following steps: Inorganic pigments, ester-based organic solvents, and the first auxiliary agent are mixed and ground in proportion to obtain a color paste; A ketone organic solvent is added to the pigment paste, and after the first stirring, the ceramic ink is obtained.

[0011] Optionally, the method for preparing the ceramic ink specifically includes the following steps: Inorganic pigments, a portion of ester-based organic solvents, and the first auxiliary agent are mixed and ground in a certain proportion to obtain a color paste; A ketone organic solvent is added to the pigment paste, and after the first stirring, a second auxiliary agent and the remaining ester organic solvent are added. After a second stirring, the ceramic ink is obtained.

[0012] Optionally, the particle size D50 of the pigment is ≤400 nm; The process parameters for the first stirring are: temperature ≤25℃, time 30~50 min; The process parameters for the second stirring are: temperature ≤25℃, time 1~2 h.

[0013] A third aspect of the present invention provides the application of the ceramic ink of the present invention as described above in the preparation of building ceramic bricks.

[0014] Beneficial effects: The ceramic ink provided by this invention has good hydrophilicity and permeability. Water-based glazes can be evenly spread on the ink layer formed by the ceramic ink. This effectively solves the problem that when water-based glazes are applied to the surface after the existing oil-based ceramic ink is sprayed onto the glaze, the two repel each other, causing the water-based glazes to be unable to spread evenly on the surface. This results in defects such as pitting, unevenness, and unevenness on the glaze surface after drying. In other words, this invention effectively solves the interfacial repulsion problem between existing oil-based ceramic inks and water-based glazes. Among them, low molecular weight (50~150 g / mol) ketone organic solvents and low molecular weight (200~400 g / mol) ester organic solvents have high permeability, which can reduce the surface tension of the ink and promote the ink to quickly penetrate into the interior of the glaze layer after being printed onto the glaze surface (i.e., rapidly penetrate into the interior of the glaze layer), enhance the bonding force between the ink and the glaze layer, and effectively avoid the formation of continuous oil film (providing immediate hydrophilicity). When water-based glazes are applied, the water-based glazes can obtain good spreading ability on the ink layer, avoiding defects such as pitting, unevenness, etc. on the glaze surface after drying. The use of low molecular weight (800~1200 g / mol) dispersants can improve the dispersion stability of inorganic pigments while avoiding the adverse effects of the good film-forming properties of polymeric dispersants (avoiding the addition of polymeric dispersants can prevent the ink from forming a continuous and dense polymeric oil film on the glaze surface, which can further reduce the film-forming properties of the system and improve the permeability of the ink), ensuring that the inorganic pigments remain stably dispersed and do not agglomerate during rapid penetration, and quickly adhere to the surface of the ceramic glaze layer.

[0015] In addition, the ink formulation of the present invention can enhance the compatibility of the ink with highly permeable solvents (low molecular weight ketone organic solvents and ester organic solvents), ensuring ink stability.

[0016] Different types and amounts of ketone organic solvents can be selected according to the ink performance requirements, but the proportion should not be too high (3-5 parts are used in the embodiments of this invention). This is because most low molecular weight ketone organic solvents have strong volatility and irritation, and some ketone organic solvents also have a certain degree of toxicity. Safe and environmentally friendly solvents should be prioritized (for example, isophorone is low in toxicity, low in volatility, safe and controllable). While controlling the amount added, other solvents can be used to reduce the vapor pressure of the solvent system, resulting in a more stable solvent system.

[0017] Therefore, this invention employs low-molecular-weight ketone and ester organic solvents in conjunction with low-molecular-weight dispersants to create a novel pathway that balances physical penetration and surface adsorption. This approach avoids the film-forming properties of polymeric dispersants (although polymeric dispersants can improve dispersibility, their film-forming properties exacerbate oil-water interface problems) and utilizes the rapid penetration of low-molecular-weight ketone and ester organic solvents to fundamentally disrupt the continuous oil film. This invention, by using a low-molecular-weight system to ensure dispersibility while actively sacrificing film-forming properties in exchange for permeability and hydrophilicity, represents a physicochemical approach fundamentally different from polymer chemical modification. Attached Figure Description

[0018] Figure 1 To form an ink layer by spraying the black ceramic ink from Example 1, as well as external ink 1 and external ink 2, onto the glaze surface, the glaze surface effect is shown after applying water-based glaze to the ink layer using a scraping glaze process.

[0019] Figure 2 To form ink layers by spraying the black ceramic ink, external ink 1, external ink 2 and external ink 3 from Example 1 onto the glaze surface, a comparison of the glaze surface repulsion state after applying water-based glaze to the ink layer using the spray glazing process is shown. Detailed Implementation

[0020] This invention provides a ceramic ink, its preparation method, and its application. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] This invention provides a ceramic ink (this invention also provides a method for improving the hydrophilicity and permeability of ceramic ink), wherein, by weight, the ceramic ink comprises the following components: 30-43 parts of inorganic pigment, 35-60 parts of ester organic solvent, 3-5 parts of ketone organic solvent, and 2-7 parts of first auxiliary agent; The molecular weight of the ester organic solvent is 200~400 g / mol (for example, it can be 200 g / mol, 220 g / mol, 250 g / mol, 280 g / mol, 300 g / mol, 320 g / mol, 350 g / mol, 380 g / mol or 400 g / mol, etc.). The molecular weight of the ketone organic solvent is 50~150 g / mol (for example, it can be 50 g / mol, 60 g / mol, 70 g / mol, 80 g / mol, 90 g / mol, 100 g / mol, 110 g / mol, 120 g / mol, 130 g / mol, 140 g / mol or 150 g / mol, etc.). The first adjuvant is a dispersant, which includes a first dispersant with a molecular weight of 800~1200 g / mol (for example, the molecular weight of the first dispersant can be 800 g / mol, 850 g / mol, 900 g / mol, 950 g / mol, 1000 g / mol, 1050 g / mol, 1100 g / mol, 1150 g / mol or 1200 g / mol, etc.).

[0023] The ceramic ink provided in this invention has excellent hydrophilicity and permeability. Water-based glazes can spread evenly on the ink layer formed by the ceramic ink, effectively solving the problem that when existing oil-based ceramic inks are sprayed onto a glaze surface and then water-based glazes are applied, the two repel each other, preventing the water-based glaze from spreading evenly and resulting in defects such as pitted surfaces, dents, and uneven glaze surfaces after drying. In other words, this invention effectively solves the interfacial repulsion problem between existing oil-based ceramic inks (such as black ceramic inks) and water-based glazes. Specifically, low molecular weight (50~150 g / mol) ketone organic solvents and low molecular weight (200~400 g / mol) ester organic solvents have high permeability, which can reduce the surface tension of the ink, allowing it to quickly penetrate into the glaze layer after spraying onto the glaze surface (i.e., rapidly penetrating into the glaze layer), enhancing the bonding force between the ink and the glaze layer, and effectively preventing the formation of a continuous oil film (providing immediate hydrophilicity). The water-based glaze can achieve good spreading ability on the ink layer, avoiding defects such as pitted surfaces, dents, and uneven glaze surfaces after drying. The use of low molecular weight (800~1200 g / mol) dispersants can improve the dispersion stability of inorganic pigments while avoiding the adverse effects of the good film-forming properties of polymeric dispersants (avoiding the addition of polymeric dispersants can prevent the ink from forming a continuous and dense polymeric oil film on the glaze surface, which can further reduce the film-forming properties of the system and improve the permeability of the ink). It can ensure that inorganic pigments remain stable and do not agglomerate during rapid penetration and quickly adhere to the surface of ceramic glaze.

[0024] This invention breaks through the traditional approach of relying on high molecular weight solvents and dispersants to enhance film-forming properties and dispersion stability in existing ceramic inks. It innovatively adopts a solvent system combining low molecular weight esters (200-400 g / mol) and low molecular weight ketones (50-150 g / mol), paired with a low molecular weight primary dispersant of 800-1200 g / mol. Through the synergistic effect of the low molecular weight combination of solvent and dispersant, it actively sacrifices non-essential film-forming properties in exchange for excellent hydrophilicity and permeability of the ink. It both disrupts the formation of continuous oil film by utilizing the high permeability of low molecular weight solvents and enhances the polarity of the ink layer through the directional adsorption of polar functional groups in the components, ultimately achieving uniform spreading of water-based glazes and fundamentally solving the interfacial repulsion problem between existing oil-based inks and water-based glazes.

[0025] In addition, using the above ratio (i.e., the optimized ink formulation) can enhance the compatibility of the ink with highly penetrating solvents (low molecular weight ketone organic solvents and ester organic solvents) and ensure ink stability.

[0026] Different types and amounts of ketone organic solvents can be selected according to the ink performance requirements, but the proportion should not be too high (3-5 parts are used in the embodiments of this invention). This is because most low molecular weight ketone organic solvents have strong volatility and irritation, and some ketone organic solvents also have a certain degree of toxicity. Safe and environmentally friendly solvents should be prioritized (for example, isophorone is low in toxicity, low in volatility, safe and controllable). While controlling the amount added, other solvents can be used to reduce the vapor pressure of the solvent system, resulting in a more stable solvent system.

[0027] Therefore, this invention employs low-molecular-weight ketone and ester organic solvents in conjunction with low-molecular-weight dispersants to create a novel pathway that balances physical penetration and surface adsorption. This approach avoids the film-forming properties of polymeric dispersants (although polymeric dispersants can improve dispersibility, their film-forming properties exacerbate oil-water interface problems) and utilizes the rapid penetration of low-molecular-weight ketone and ester organic solvents to fundamentally disrupt the continuous oil film. This invention, by using a low-molecular-weight system to ensure dispersibility while actively sacrificing film-forming properties in exchange for permeability and hydrophilicity, represents a physicochemical approach fundamentally different from polymeric chemical modification.

[0028] In some embodiments, the ester organic solvent includes at least one of isopropyl lauryl ester, isooctyl palmitate, and dioctyl adipate, but is not limited thereto.

[0029] In some embodiments, the ketone organic solvent includes at least one of acetone, but not limited to, methyl isobutyl ketone, cyclohexanone, and isophorone.

[0030] These ester and ketone organic solvents are highly permeable solvents with good penetration properties. They can reduce the surface tension of the ink, allowing the ink to quickly penetrate into the glaze layer after being printed onto the glaze surface, thus preventing the formation of a continuous oil film on the glaze surface after ink printing.

[0031] In some embodiments, the ester organic solvent includes isooctyl palmitate and dioctyl adipate, wherein the mass ratio of isooctyl palmitate to dioctyl adipate is (3~6):1, for example, it can be 3:1, 4:1, 5:1 or 6:1, etc.

[0032] In this embodiment, the formulation ratio is optimized, and the ratio of isooctyl palmitate and dioctyl adipate in the ester organic solvent is reasonably adjusted to balance the volatility and stability of the ink.

[0033] In some embodiments, the first dispersant comprises a solvent-based phosphate dispersant, wherein the solvent-based phosphate dispersant comprises at least one of alkylphenol polyoxyethylene ether phosphate (such as octylphenol polyoxyethylene ether phosphate) and isooctanol polyoxyethylene ether phosphate.

[0034] The use of these low molecular weight dispersants can improve the dispersion stability of inorganic pigments while avoiding the adverse effects of the good film-forming properties of polymeric dispersants (avoiding the addition of polymeric dispersants can prevent the ink from forming a continuous and dense polymeric oil film on the glaze surface, which can further reduce the film-forming properties of the system and improve the permeability of the ink). It can ensure that inorganic pigments remain stable and do not agglomerate during rapid penetration and quickly adhere to the surface of the ceramic glaze layer.

[0035] In some embodiments, the dispersant further includes a second dispersant, which includes, but is not limited to, a silane coupling agent. The silane coupling agent includes, but is not limited to, at least one of N-(β-aminoethyl)-γ-aminopropylmethyldimethoxysilane, silane coupling agent KH550 (3-aminopropyltriethoxysilane), silane coupling agent KH560 (γ-glycidoxypropyltrimethoxysilane), and silane coupling agent KH580 (3-mercaptopropyltriethoxysilane).

[0036] These low-molecular-weight silane coupling agents, when used in combination with the first dispersant, can further mitigate the adverse effects of the good film-forming properties of the polymeric dispersant. In some embodiments, the ceramic ink further includes 1-3 parts by weight of a second additive; The second additive includes at least one of a thickener and a penetration enhancer.

[0037] The tackifiers include modified polyacrylates (such as epoxy resin modified polyacrylates, silane modified polyacrylates, etc.), and the penetration aids include isomeric tridecyl alcohol polyoxyethylene ether.

[0038] The use of penetration enhancers can strengthen the penetration effect; the use of thickeners can regulate ink viscosity, improve the overall stability of ink, help ink form a stable initial adhesion on the glaze surface, reduce ink loss, and provide a good premise for subsequent vertical penetration guided by penetration enhancers.

[0039] In some embodiments, the inorganic pigment includes, but is not limited to, a black inorganic pigment (specifically, a spinel-type black inorganic pigment, whose main component may be a cobalt-chromium-iron-nickel spinel composite oxide (Co-Cr-Fe-Ni)). In this case, the ceramic ink is a black ceramic ink.

[0040] Currently, mainstream black ceramic inks are made using organic solvents as a medium, exhibiting significant oily characteristics. In the production process of architectural ceramic tiles, when a certain amount of oil-based ceramic ink is sprayed onto the glaze surface, and then a water-based glaze is applied, the two repel each other, preventing the water-based glaze from spreading evenly and resulting in defects such as pitting, unevenness, and roughness after drying. To address these defects in black ceramic ink used in large-area, high-volume applications in ceramic tile production, this invention employs a technical solution combining low-molecular-weight ketone and ester organic solvents with a low-molecular-weight dispersant. By avoiding the film-forming properties of high-molecular-weight dispersants and utilizing the rapid penetration of low-molecular-weight solvents to fundamentally disrupt the continuous oil film, the water-based glaze achieves excellent spreading ability on the ink layer, preventing defects such as pitting, unevenness, and roughness after drying. This effectively solves the interfacial repulsion problem between existing oil-based black ceramic inks and water-based glazes.

[0041] This invention also provides a method for preparing the ceramic ink described above, comprising the following steps: Inorganic pigments, ester-based organic solvents, and the first auxiliary agent are mixed and ground in proportion to obtain a color paste; A ketone organic solvent is added to the pigment paste, and after the first stirring, the ceramic ink is obtained.

[0042] In some embodiments, the method for preparing the ceramic ink specifically includes the following steps: S1. Mix and grind the inorganic pigment, a portion of the ester-based organic solvent, and the first auxiliary agent in proportion to obtain a color paste; S2. Add a ketone organic solvent to the pigment paste, stir for the first time, add a second auxiliary agent and the remaining ester organic solvent, stir for the second time, and obtain the ceramic ink.

[0043] The preparation method provided by this invention is simple and suitable for large-scale production. The resulting ceramic ink has good hydrophilicity and permeability, and the water-based glaze can spread evenly on the ink layer formed by the ceramic ink, effectively solving the interfacial repulsion problem between existing oil-based ceramic inks (such as black ceramic ink) and water-based glazes. Specifically, the low molecular weight (50~150 g / mol) ketone organic solvents and low molecular weight (200~400 g / mol) ester organic solvents have high permeability, which can reduce the surface tension of the ink, allowing it to quickly penetrate into the glaze layer after being printed onto the glaze surface. This enhances the bonding force between the ink and the glaze layer, effectively preventing the formation of a continuous oil film (providing immediate hydrophilicity). The water-based glaze can achieve good spreading ability on the ink layer, avoiding defects such as pitting, unevenness, and uneven glaze surface after drying. The use of low molecular weight (800~1200 g / mol) dispersants can improve the dispersion stability of inorganic pigments while avoiding the adverse effects of the good film-forming properties of high molecular weight dispersants. This ensures that inorganic pigments remain stably dispersed and do not agglomerate during rapid penetration, and quickly adhere to the surface of the ceramic glaze. By adopting the above ratio, the compatibility of the ink with highly penetrating solvents (low molecular weight ketone and ester organic solvents) can be enhanced, ensuring ink stability.

[0044] In some embodiments, the particle size D50 of the pigment is ≤400 nm (e.g., it can be 100 nm, 200 nm, 300 nm or 400 nm, etc.).

[0045] In some embodiments, the process parameters for the first stirring are: temperature ≤25℃, time 30~50min (e.g., 30 min, 35 min, 40 min, 45 min or 50 min, etc.).

[0046] In some embodiments, the process parameters for the second stirring are: temperature ≤25℃, time 1~2 h (e.g., 1 h, 1.5 h or 2 h, etc.).

[0047] This invention also provides an application of the ceramic ink described above in the preparation of building ceramic bricks.

[0048] This invention also provides a building ceramic tile, wherein the building ceramic tile includes a glaze decorative layer, the glaze decorative layer being formed by preparing (e.g., printing) the ceramic ink as described above.

[0049] The present invention will be further described below through specific embodiments.

[0050] Unless otherwise specified, the raw materials used in the following embodiments are all commercially available products.

[0051] Example 1 This embodiment provides a black ceramic ink and its preparation method, wherein the black ceramic ink comprises the following components by weight: 33.5 parts black inorganic pigment, 57 parts ester organic solvent, 4 parts ketone organic solvent, 1.2 parts silane coupling agent KH550, and 2.3 parts octylphenol polyoxyethylene ether phosphate (its molecular weight is 814 g / mol, and its chemical formula is C8H). 17 -C6H4-O-(CH2CH2O) 12 -PO(OH)2, the octylphenol polyoxyethylene ether phosphate used in Examples 2 and 3 is the same as that used in Example 1), 0.8 parts of tackifier and 1.2 parts of penetration enhancer.

[0052] Among them, the black inorganic pigment is an inorganic pigment mainly composed of cobalt-chromium-iron-nickel spinel composite oxide (Co-Cr-Fe-Ni) (with a particle size of 5 μm; containing the following components in mass percentage: cobalt oxide 12%, chromium oxide 30%, iron oxide 45%, nickel oxide 8%, aluminum oxide 2%, silicon dioxide 2% and sodium oxide 1%). The ester organic solvent is composed of isooctyl palmitate (industrial grade, purity ≥98%) and dioctyl adipate (industrial grade, purity ≥98%) in a mass ratio of 3:1. The ketone organic solvent was isophorone (analytical grade, purity ≥99.5%). The tackifier is epoxy resin modified polyacrylate (for its preparation method, please refer to "Preparation and Application of Epoxy Resin / Polyacrylate Emulsion, Fine Chemicals, Zheng Yanqing et al"). The penetration enhancer is isomeric tridecyl alcohol polyoxyethylene ether ((C2H4O)). n C 13 H 28 O, n=5).

[0053] The preparation method of black ceramic ink, by weight, includes the following steps: (1) Preparation of color paste: 33.5 parts of black inorganic pigment, 20.8 parts of ester organic solvent, 1.2 parts of silane coupling agent KH550, and 2.3 parts of octylphenol polyoxyethylene ether phosphate were added to a sand mill and ground at 2500 rpm until the median diameter (D50) of the pigment particles was 400 nm to obtain a uniform color paste (that is, if the color paste is 100% by mass, then the color paste contains 58% black inorganic pigment, 36% ester organic solvent, 2% silane coupling agent KH550 and 4% solvent-based phosphate dispersant 5531).

[0054] (2) Addition of ketone organic solvent: Add 4 parts of ketone organic solvent to the color paste prepared above, while mechanically stirring for 40 minutes, and control the temperature at 20℃~25℃.

[0055] (3) Ink preparation: Add 0.8 parts of thickener, 1.2 parts of penetration enhancer and 36.2 parts of ester organic solvent to the slurry obtained in step (2). Control the temperature at 20℃~25℃ and mechanically stir for 1.5 hours to ensure that the system is uniform and stable. Finally, filter with a 3-micron filter to obtain a finished ink with a solid content of 39%, a viscosity of 18 mPa·s at 40℃ and a surface tension of 27 mN / m.

[0056] Example 2 This embodiment provides a black ceramic ink and its preparation method, wherein the black ceramic ink comprises the following components by weight: 32.1 parts black inorganic pigment, 57 parts ester organic solvent, 5 parts ketone organic solvent, 1.1 parts silane coupling agent KH550, 2.8 parts octylphenol polyoxyethylene ether phosphate, 0.5 parts thickener and 1.5 parts penetration enhancer.

[0057] The specific selections of black inorganic pigment, ketone organic solvent, thickener, and penetration aid are the same as in Example 1.

[0058] The ester organic solvent is composed of isooctyl palmitate (industrial grade, purity ≥98%) and dioctyl adipate (industrial grade, purity ≥98%) in a mass ratio of 6:1.

[0059] The preparation method of black ceramic ink, by weight, includes the following steps: (1) Preparation of color paste: 32.1 parts of black inorganic pigment, 19.4 parts of ester organic solvent, 1.1 parts of silane coupling agent KH550, and 2.8 parts of octylphenol polyoxyethylene ether phosphate were added to a sand mill and ground at 2500 rpm until the median diameter of the pigment particles was 400 nm to obtain a uniform color paste (that is, if the color paste is 100% by mass percentage, then the color paste contains 58% black inorganic pigment, 35% ester organic solvent, 2% silane coupling agent KH550 and 5% solvent-based phosphate dispersant 5531).

[0060] (2) Addition of ketone organic solvent: Add 5 parts of ketone organic solvent to the color paste prepared above, while mechanically stirring for 40 minutes, and control the temperature at 20℃~25℃.

[0061] (3) Ink preparation: Add 0.5 parts of thickener, 1.5 parts of penetration enhancer and 37.6 parts of ester organic solvent to the slurry obtained in step (2). Control the temperature at 20℃~25℃ and mechanically stir for 1.5 hours to ensure that the system is uniform and stable. Finally, filter with a 3-micron filter to obtain a finished ink with a solid content of 38%, a viscosity of 19 mPa·s at 40℃ and a surface tension of 27 mN / m.

[0062] Example 3 This embodiment provides a black ceramic ink and its preparation method, wherein the black ceramic ink comprises the following components by weight: 40 parts black inorganic pigment, 50 parts ester organic solvent, 5 parts ketone organic solvent, 1.5 parts silane coupling agent KH550, 1.5 parts octylphenol polyoxyethylene ether phosphate, 0.5 parts thickener and 1.5 parts penetration enhancer.

[0063] The specific selections of black inorganic pigment, ester organic solvent, ketone organic solvent, thickener and penetration aid are the same as in Example 1.

[0064] The preparation method of black ceramic ink, by weight, includes the following steps: (1) Preparation of color paste: 40 parts of black inorganic pigment, 45 parts of ester organic solvent, 1.5 parts of silane coupling agent KH550 and 1.5 parts of octylphenol polyoxyethylene ether phosphate are added to a sand mill and ground at 2500 rpm until the median diameter of the pigment particles is 400 nm to obtain a uniform color paste (that is, if the color paste is 100% by mass percentage, then the color paste contains 45% black inorganic pigment, 51% ester organic solvent, 2% silane coupling agent KH550 and 2% solvent-based phosphate dispersant 5531).

[0065] (2) Addition of ketone organic solvent: Add 5 parts of ketone organic solvent to the color paste prepared above, while mechanically stirring for 40 minutes, and control the temperature at 20℃~25℃.

[0066] (3) Ink preparation: Add 0.5 parts of thickener, 1.5 parts of penetration aid and 5 parts of ester organic solvent to the slurry obtained in step (2), control the temperature at 20℃~25℃ and mechanically stir for 1.5 hours to ensure that the system is uniform and stable. Finally, filter with a 3-micron filter to obtain the finished ink.

[0067] In the above embodiments, isooctyl palmitate and dioctyl adipate are selected in a ratio of 3:1 or 6:1, which can balance the volatility and stability of the ink and help ensure the compatibility of the ink with water-based glazes.

[0068] test: (1) The black ceramic ink from Example 1, as well as external ink 1 and external ink 2, are respectively sprayed onto the glaze surface to form an ink layer. Then, a water-based glaze is applied to the ink layer using a scraping glaze process. The glaze surface effect is as follows: Figure 1 As shown, after applying the water-based glaze to the ink layer formed by the black ceramic ink in Example 1, the resulting glaze surface is smooth with a few pits. However, after applying the water-based glaze to the ink layer formed by external ink 1, the resulting glaze surface has more pits and shallower depressions. After applying the water-based glaze to the ink layer formed by external ink 2, the resulting glaze surface has more pits and deeper depressions.

[0069] (2) The black ceramic ink, external ink 1, external ink 2 and external ink 3 from Example 1 are sprayed onto the glaze surface to form an ink layer. The glaze surface repulsion state after applying water-based glaze to the ink layer using the spray glazing process is as follows: Figure 2 As shown. It can be seen that after spraying the water-based glaze onto the ink layer formed by the black ceramic ink in Example 1, the drying speed is fast and there is no repulsion. After spraying the water-based glaze onto the ink layer formed by outer ink 1, the grayness is high and there is strong repulsion. After spraying the water-based glaze onto the ink layer formed by outer ink 2, the grayness is high, the drying is slow, and there is repulsion. After spraying the water-based glaze onto the ink layer formed by outer ink 3, the grayness is high and the drying is slow.

[0070] (3) Further testing of the performance of the black ceramic inks in Examples 2 and 3 was conducted. The black ceramic inks in Examples 2 and 3 were sprayed onto the glaze surface to form an ink layer. Then, a water-based glaze was applied to the ink layer using a scraping glaze process. The results were similar to those of the black ceramic ink in Example 1. After applying the water-based glaze to the ink layer formed by the black ceramic inks in Examples 2 and 3, the resulting glaze surface was smooth with a small number of pits. The black ceramic inks in Examples 2 and 3 were sprayed onto the glaze surface to form an ink layer. Then, a water-based glaze was applied to the ink layer using a spraying glaze process. The results were similar to those of the black ceramic ink in Example 1. After spraying the water-based glaze onto the ink layer formed by the black ceramic inks in Examples 2 and 3, the drying speed was fast and there was no rejection.

[0071] In summary, the ceramic ink provided by this invention possesses excellent hydrophilicity and permeability. Water-based glazes can spread evenly on the ink layer formed by the ceramic ink, effectively solving the problem that when existing oil-based ceramic inks are sprayed onto a glaze surface and then water-based glazes are applied, the two repel each other, preventing the water-based glaze from spreading evenly and resulting in defects such as pitted surfaces, uneven glaze surfaces, and roughness after drying. In other words, this invention effectively solves the interfacial repulsion problem between existing oil-based ceramic inks and water-based glazes. The low molecular weight ketone and ester organic solvents have high permeability, reducing the surface tension of the ink and promoting rapid penetration into the glaze layer after spraying, enhancing the adhesion between the ink and the glaze layer, and effectively preventing the formation of a continuous oil film (providing immediate hydrophilicity). The water-based glaze can achieve good spreading ability on the ink layer, avoiding defects such as pitted surfaces, uneven glaze surfaces, and roughness after drying. The use of low molecular weight dispersants can improve the dispersion stability of inorganic pigments while avoiding the adverse effects of the good film-forming properties of high molecular weight dispersants. It can ensure that inorganic pigments remain stable and do not agglomerate during rapid penetration and quickly adhere to the surface of ceramic glaze.

[0072] In addition, the ink formulation of the present invention can enhance the compatibility of the ink with highly permeable solvents (low molecular weight ketone organic solvents and ester organic solvents), ensuring ink stability.

[0073] Different types and amounts of ketone organic solvents can be selected according to the ink performance requirements, but the proportion should not be too high (3-5 parts are used in the embodiments of this invention). This is because most low molecular weight ketone organic solvents have strong volatility and irritation, and some ketone organic solvents also have a certain degree of toxicity. Safe and environmentally friendly solvents should be prioritized (for example, isophorone is low in toxicity, low in volatility, safe and controllable). While controlling the amount added, other solvents can be used to reduce the vapor pressure of the solvent system, resulting in a more stable solvent system.

[0074] Therefore, this invention employs low-molecular-weight ketone and ester organic solvents in conjunction with low-molecular-weight dispersants to create a novel pathway that balances physical penetration and surface adsorption. By circumventing the film-forming properties of polymers and utilizing the rapid penetration of low-molecular-weight ketone and ester organic solvents, it fundamentally disrupts the continuous oil film. This invention, using a low-molecular-weight system, actively sacrifices film-forming properties in exchange for permeability and hydrophilicity while ensuring dispersibility; this represents a physicochemical approach fundamentally different from polymer chemical modification.

[0075] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A ceramic ink, characterized in that, The ceramic ink comprises the following components by weight: 30-43 parts of inorganic pigment, 35-60 parts of ester organic solvent, 3-5 parts of ketone organic solvent, and 2-7 parts of first auxiliary agent; The molecular weight of the ester organic solvent is 200~400 g / mol; The molecular weight of the ketone organic solvent is 50~150 g / mol; The first adjuvant is a dispersant, and the dispersant includes a first dispersant with a molecular weight of 800~1200 g / mol.

2. The ceramic ink according to claim 1, characterized in that, The ester organic solvents include at least one of isopropyl lauryl ester, isooctyl palmitate, and dioctyl adipate.

3. The ceramic ink according to claim 1, characterized in that, The ketone organic solvents include at least one of acetone, butanone, methyl isobutyl ketone, cyclohexanone, and isophorone.

4. The ceramic ink according to claim 1, characterized in that, The dispersant further includes a second dispersant, the second dispersant comprising a silane coupling agent; and / or, The first dispersant includes solvent-based phosphate ester dispersants.

5. The ceramic ink according to claim 1, characterized in that, The ester organic solvents include isooctyl palmitate and dioctyl adipate, wherein the mass ratio of isooctyl palmitate to dioctyl adipate is (3~6):

1.

6. The ceramic ink according to claim 1, characterized in that, The ceramic ink further includes 1 to 3 parts of a second additive by weight. The second additive includes at least one of a thickener and a penetration enhancer.

7. A method for preparing the ceramic ink according to claim 1, characterized in that, Includes the following steps: Inorganic pigments, ester-based organic solvents, and the first auxiliary agent are mixed and ground in proportion to obtain a color paste; A ketone organic solvent is added to the pigment paste, and after the first stirring, the ceramic ink is obtained.

8. The preparation method according to claim 7, characterized in that, The preparation method of the ceramic ink specifically includes the following steps: Inorganic pigments, a portion of ester-based organic solvents, and the first auxiliary agent are mixed and ground in a certain proportion to obtain a color paste; A ketone organic solvent is added to the pigment paste, and after the first stirring, a second auxiliary agent and the remaining ester organic solvent are added. After a second stirring, the ceramic ink is obtained.

9. The preparation method according to claim 8, characterized in that, The particle size of the pigment is D50≤400 nm; The process parameters for the first stirring are: temperature ≤25℃, time 30~50 min; The process parameters for the second stirring are: temperature ≤25℃, time 1~2 h.

10. The application of a ceramic ink as described in any one of claims 1-6 in the preparation of building ceramic bricks.

Images