A kind of micro-ceramic ink and its preparation and application

Abstract

The present application relates to the technical field of micro-ceramic ink and coated plate, and discloses a micro-ceramic ink and its preparation and application. The micro-ceramic ink comprises a primer and a topcoat, wherein the primer comprises 55-62wt% polyester, 5-10wt% epoxy resin, 4-16wt% polyurethane, 1-10wt% pigment, 2-8wt% auxiliary agent and 8-18wt% solvent, and the topcoat comprises 20-41wt% epoxy resin, 16-24wt% polyurethane, 7-16wt% acrylate, 1-10wt% pigment, 15-30wt% corundum or SiO2, 0.5-3wt% wax powder, 1-6wt% auxiliary agent and 1-6wt% solvent. The primer and topcoat each have their own functions and complement each other. They can strongly adhere to common substrates such as metal plates, glass plates, ceramic plates, etc. There is no need to perform surface treatment on the substrate before coating. After coating, a high hardness, wear-resistant and corrosion-resistant coating is formed on the surface of the substrate, which provides a covering and protective effect on the substrate, which is beneficial to improving the overall service life. It has an excellent wiping effect and can be used as a writing board for ink pens, oil pens, etc. More importantly, it has a superior powder hanging effect and is very suitable for chalk writing and wiping, and can be used as a teaching blackboard.

Description

Technical Field

[0001] The present application relates to the technical field of micro-ceramic ink and coated plates, and in particular, to a micro-ceramic ink and its preparation and application. Background Art

[0002] Coated plate is a composite plate with metal plates such as cold-rolled plate, hot-dip galvanized plate, aluminum-plated plate, high aluminum alloy plate, stainless steel plate, or non-metallic plates such as tempered glass plate and ceramic plate as the base, which is coated with various protective and decorative coatings after surface treatment.

[0003] The surface hardness of the commonly used coated plate products is low, and the surface wear resistance and corrosion resistance are relatively poor. In relatively humid environment conditions, they are easily corroded and damaged, and cannot protect the base plate. Under the condition that the type of base plate does not change much, if you want to improve these problems, you need to customize the coating material with better performance to match the higher performance, and the corresponding cost will also increase.

[0004] In addition, coated boards can be used as blackboards in the education industry, but there are dozens of common types of chalk in the industry. Conventional blackboard coatings do not have enough powder, making it difficult to match so many types of chalk at the same time and achieve good powder coating and wiping effects at the same time, making it difficult to meet writing needs. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a micro-ceramic ink to overcome at least one of the deficiencies of the above-mentioned prior art, and solve the technical problems that the existing coating plates have low hardness, insufficient powder coating, and are difficult to meet writing needs.

[0006] In order to solve the above-mentioned technical problems, the embodiments of the present application adopt the following technical solutions:

[0007] In the first aspect, a micro-ceramic ink comprises a primer and a topcoat, wherein the primer comprises 55-62wt% polyester, 5-10wt% epoxy resin, 4-16wt% polyurethane, 1-10wt% pigment, 2-8wt% additive and 8-18wt% solvent, and the topcoat comprises 20-41wt% epoxy resin, 16-24wt% polyurethane, 7-16wt% acrylate, 1-10wt% pigment, 15-30wt% corundum or SiO2, 0.5-3wt% wax powder, 1-6wt% additive and 1-6wt% solvent.

[0008] In a second aspect, a method for preparing a micro-ceramic ink is provided in the first aspect, and the preparation method comprises the following steps:

[0009] Mix the raw materials of the primer according to the proportion, stir evenly, and filter;

[0010] Mix the raw materials of the topcoat according to the proportion, stir evenly and filter.

[0011] In the third aspect, a micro-ceramic coated plate is made of the above-mentioned micro-ceramic ink, comprising a substrate layer, a primer layer and a topcoat layer, wherein the primer layer and the topcoat layer are formed by the above-mentioned micro-ceramic ink, the primer layer is formed by coating the primer on one side of the substrate layer, and the topcoat layer is formed by coating the topcoat on the side of the primer layer facing away from the substrate layer.

[0012] In a fourth aspect, a method for preparing a micro-ceramic coated plate, wherein the micro-ceramic coated plate is the micro-ceramic coated plate provided in the third aspect, and the preparation method comprises the following steps:

[0013] Prepare substrate and micro-ceramic ink;

[0014] Apply the primer evenly and continuously on the substrate and bake to form a primer layer;

[0015] Apply the topcoat evenly and continuously on the primer layer and bake to form the topcoat layer.

[0016] In a fifth aspect, a micro-ceramic coated board is used in an erasable writing board. Preferably, the writing board is adapted to several types of writing pens at the same time, and the writing pens at least include chalk. Among them, the micro-ceramic coated board made of corundum or coupled is particularly suitable for adapting to several types of chalk at the same time.

[0017] Compared with the prior art, the embodiments of the present application have the following beneficial effects: the primer and the topcoat in the micro-ceramic ink each have their own functions and complement each other, and can be strongly attached to common substrates such as metal plates, glass plates, and ceramic plates. There is no need to surface treat the substrate before coating. After coating, a high-hardness, wear-resistant, and corrosion-resistant coating is formed on the surface of the substrate, which forms a covering and protective effect on the substrate, which is conducive to improving the overall service life. At the same time, it has an excellent wiping effect and can be used as a writing board for ink pens, oil pens, etc. More importantly, it has a superior powder hanging effect and is very suitable for chalk writing and wiping, especially for chalks of up to dozens of different systems on the market. A good powder hanging effect can be achieved, which can be used as a teaching blackboard, suitable for business, conferences, education, and many other different fields. In addition, the embodiments of the present application use environmentally friendly, low-cost, and easily accessible production raw materials and a highly efficient production process to prepare a micro-ceramic coated board, which better controls the overall production cost and is suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart of the coupling treatment of corundum or SiO2.

[0019] Figure 2 It is a specific process flow chart of the coupling treatment of corundum or SiO2.

[0020] Figure 3It is a process flow chart of the preparation of micro-ceramic ink.

[0021] Figure 4 It is a specific preparation process flow chart of micro-ceramic ink.

[0022] Figure 5 This is a process flow chart for preparing micro-ceramic coated plates.

[0023] Figure 6 It is a specific preparation process flow chart of micro-ceramic coated plates.

[0024] Figure 7 It is a structural schematic diagram of a micro-ceramic coated plate.

[0025] Description of reference numerals: substrate layer 100 , primer layer 210 , topcoat layer 220 . DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with specific embodiments.

[0027] The micro-ceramic ink provided in the present application includes a primer and a topcoat. The primer is mainly composed of organic raw materials such as polyester, epoxy resin, and polyurethane, and the topcoat is not only mainly composed of organic raw materials such as epoxy resin, polyurethane, and acrylate, but also supplemented with inorganic raw materials such as corundum or SiO2, so that the final coating has a hardness of up to 9H, good wear resistance and corrosion resistance, and a long service life.

[0028] In the embodiment of the present application, the organic raw materials in the primer are mainly polyester, supplemented by epoxy resin and polyurethane, which is beneficial to improve the adhesion between the coating and the coated substrate on the one hand, and has strong adhesion to common metal plates, glass plates, ceramic plates, etc., and there is no need to treat the surface of the substrate by wiping the primer, applying the passivation liquid, etc. before coating. On the other hand, it lays a high hardness foundation for the coating, which can effectively improve the wear resistance of the entire coating. The organic raw materials in the topcoat are mainly epoxy resin and polyurethane, supplemented by acrylate, to achieve the modification of the two systems of epoxy resin and polyurethane. The surface of the modified epoxy system is loose and porous and easy to hang powder, while the polyurethane system provides good elasticity and wear resistance. The three complement each other, so that the coating surface has a good wiping effect; corundum or SiO2 is also added to the topcoat, so that the powder hanging effect of the coating surface is better, and a good wiping effect is maintained, which is very suitable for chalk writing, which is easy to hang powder, has a good display effect after writing, and is easy to wipe off, which is convenient for cleaning after writing.

[0029] Among them, polyester is a general term for polymers obtained by polycondensation of polyols and polyacids, including but not limited to polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyarylate (PAR). Acrylate is a general term for esters of acrylic acid and its homologues, including but not limited to methyl acrylate, ethyl acrylate, 2-methyl methacrylate, and 2-ethyl methacrylate. Pigments include but are not limited to carbon black, titanium dioxide, etc. Additives mainly include emulsifiers, plasticizers, coupling agents, dispersants, etc. Solvents mainly include cyclohexanone, n-butanol, xylene, butyl acetate, etc.

[0030] Regarding the blackboards in the education industry, there are currently dozens of common types of chalks in the industry. Conventional blackboard coatings are difficult to match such a variety of chalks at the same time to achieve good powder coating and wiping effects. In order to further improve the powder coating effect and solve this technical problem, the embodiment of the present application also pre-couples the corundum or SiO2 in the topcoat, so that the powder coating effect of the final coating surface is better and it is suitable for writing with more types of chalks.

[0031] Among them, Figure 1 As shown, the coupling treatment of corundum or SiO2 includes the following steps:

[0032] Add the coupling agent and water into a container, heat in a water bath, and stir to obtain a coupling agent hydrolyzate;

[0033] The coupling agent hydrolyzate is mixed evenly with ethanol and allowed to stand to obtain a coupling agent dilution solution;

[0034] Add corundum or SiO2 into a high-speed mixer for preheating, and spray the coupling agent dilution onto the corundum or SiO2 in the high-speed mixer several times to evenly disperse the coupling agent on the surface of the corundum or SiO2.

[0035] Among them, the coupling agent is preferably a silane coupling agent KH550 / KH560 / KH972 or the like.

[0036] Furthermore, in the step of obtaining the coupling agent hydrolyzate, the coupling agent and water are added in a volume ratio of 1:3 to 1:5, and heated in a water bath at 50 to 75° C. for 1 to 3 hours.

[0037] Furthermore, in the step of obtaining the coupling agent dilution solution, the coupling agent hydrolyzate and ethanol are mixed in a volume ratio of 5:95 to 20:80, and after being mixed evenly, the mixture is allowed to stand for 20 to 60 minutes.

[0038] Furthermore, in the step of uniformly dispersing the coupling agent on the surface of corundum or SiO2, the corundum or SiO2 is preheated at 80-100°C for 10-30 minutes in a high-speed mixer.

[0039] Furthermore, if Figure 2As shown, the coupling treatment of corundum or SiO2 includes the following steps:

[0040] Add coupling agent and water in a volume ratio of 1:3 to 1:5 into a container, heat in a water bath at 50 to 75°C for 1 to 3 hours while stirring to obtain a coupling agent hydrolyzate;

[0041] The coupling agent hydrolyzate and ethanol are mixed evenly in a volume ratio of 5:95 to 20:80, and allowed to stand for 20 to 60 minutes to obtain a coupling agent dilution solution;

[0042] Add corundum or SiO2 into a high-speed mixer, preheat at 80-100°C for 10-30 minutes, spray the coupling agent dilution onto the corundum or SiO2 in the high-speed mixer several times to evenly disperse the coupling agent on the surface of the corundum or SiO2.

[0043] like Figure 3 As shown, the preparation method of micro-ceramic ink comprises the following steps:

[0044] Mix the raw materials of the primer according to the proportion, stir evenly, and filter to obtain the primer;

[0045] Mix the raw materials of the topcoat according to the proportion, stir evenly, and filter to obtain the product.

[0046] The stirring is carried out at 1000-1800 rpm for 100-150 min, and the filtering is carried out using a 100-300 mesh filter.

[0047] Furthermore, if Figure 4 As shown, the preparation method of micro-ceramic ink comprises the following steps:

[0048] 55-62wt% polyester, 5-10wt% epoxy resin, 4-16wt% polyurethane, 1-10wt% pigment, 2-8wt% additive and 8-18wt% solvent are added into a mixer for mixing, stirred at 1000-1800rpm for 100-150min, filtered with a 100-300 mesh filter to obtain a primer;

[0049] Add 20-41wt% epoxy resin, 16-24wt% polyurethane, 7-16wt% acrylate, 1-10wt% pigment, 15-30wt% corundum or SiO2, 0.5-3wt% wax powder, 1-6wt% additive and 1-6wt% solvent into a mixer and mix, stir at 1000-1800rpm for 100-150min, filter with a 100-300 mesh filter to obtain a topcoat.

[0050] The present application prepares primer and topcoat respectively by high-speed stirring and filtering through a filter. Both primer and topcoat are mainly organic raw materials, which are prone to resin agglomeration, and also contain inorganic raw materials such as pigments that are easy to agglomerate. High-speed stirring is combined with filtering through a filter. On the one hand, high-speed stirring makes the raw materials evenly mixed, and on the other hand, avoids agglomeration / agglomeration of the raw materials or disperses the agglomerated / agglomerated raw materials. After stirring, filtering is performed to screen out large particles that are still agglomerated or agglomerated after stirring, so as to prevent large particles from forming protruding points on the surface of the coating and affecting the coating finishing effect.

[0051] The substrate layer of the micro-ceramic coating plate of the present application is a substrate with a layered structure, and the substrate includes but is not limited to metal plates such as cold-rolled plates, hot-dip galvanized plates, aluminum-plated plates, high-aluminum alloy plates, stainless steel plates, and non-metal plates such as tempered glass plates and ceramic plates; the primer includes 55-62wt% polyester, 5-10wt% epoxy resin, 4-16wt% polyurethane, 1-10wt% pigment, 2-8wt% additives and 8-18wt% solvent; the topcoat includes 20-41wt% epoxy resin, 16-24wt% polyurethane, 7-16wt% acrylate, 1-10wt% pigment, 15-30wt% corundum or SiO2, 0.5-3wt% wax powder, 1-6wt% additives and 1-6wt% solvent.

[0052] The sum of the thickness of the primer layer and the topcoat layer of the micro-ceramic coating plate is 20 to 35 μm.

[0053] The embodiment of the present application uses the above-mentioned micro-ceramic ink to make a micro-ceramic coated board, wherein the primer can be well attached to the surface of the substrate, giving excellent properties such as high hardness, high wear resistance, and high corrosion resistance, and the topcoat can be well attached to the surface of the primer layer, giving excellent powder coating and wiping effects. The final micro-ceramic coated board has a hardness of up to 9H, is both wear-resistant and corrosion-resistant, and has a covering and protective effect on the substrate. More importantly, the micro-ceramic coated board is easy to coat with powder and easy to wipe, and is very suitable as a writing board, especially as a blackboard for writing with chalk, and is suitable for use in the education industry, business office and other scenarios.

[0054] like Figure 5 As shown, the preparation method of the micro-ceramic coating plate of the present application includes the following steps:

[0055] preparing a substrate and the micro-ceramic ink;

[0056] Apply the primer evenly and continuously on the substrate and bake to form a primer layer;

[0057] Apply the topcoat evenly and continuously on the primer layer and bake to form the topcoat layer.

[0058] Further:

[0059] In forming the primer layer, a coating with a thickness of 8 to 16 μm is formed after full coating, and after full coating, it is baked at 210 to 250° C. for 25 to 60 seconds; further, the primer is fully coated on the substrate using a spraying or roller coating (scraping) device, preferably a roller coating (scraping) device.

[0060] In forming the topcoat layer, a coating with a thickness of 15 to 25 μm is formed after full coating, and after full coating, it is baked at 220 to 250° C. for 25 to 60 seconds; further, the topcoat is fully coated on the primer layer using spraying or roller coating (scraping) equipment, preferably using roller coating (scraping) equipment.

[0061] Furthermore, if Figure 6 As shown, the preparation method of the micro-ceramic coating plate includes the following steps:

[0062] preparing a substrate and the micro-ceramic ink;

[0063] The prepared primer is evenly and continuously applied on the prepared substrate by roller coating (scrape coating) equipment to form a coating with a thickness of 8 to 16 μm, and baked in a baking equipment at 210 to 250° C. for 25 to 60 seconds to form a primer layer;

[0064] The prepared topcoat is evenly and continuously applied on the formed primer layer by roller coating (scrape coating) equipment to form a coating with a thickness of 15 to 25 μm, and baked in a baking equipment at 220 to 250° C. for 25 to 60 seconds to form a topcoat layer, thus obtaining a micro-ceramic coated plate;

[0065] The obtained micro-ceramic coated plates are cut into specified sizes and packaged.

[0066] Among them, baking equipment includes but is not limited to tunnel furnaces, ovens, tower furnaces, etc.

[0067] In the embodiment of the present application, the above-mentioned micro-ceramic ink is applied to a substrate such as a metal plate or a non-metal plate, and the primer and the topcoat are successively applied and baked to be fixed on the substrate, and the coating thicknesses are 8 to 16 μm and 15 to 25 μm respectively, and finally a micro-ceramic coating plate (such as Figure 7 As shown in FIG. 1 , the sum of the thickness of the primer layer and the topcoat layer is 20 to 35 μm. It is worth noting that the applicant has found that the powder coating effect of the micro-ceramic coating plate obtained by using a roller coating (scrape coating) device to apply the primer and topcoat by roller coating is significantly better than other coating methods.

[0068] Example 1

[0069] The present embodiment provides a micro-ceramic ink, which includes a primer and a topcoat, the primer including 58 parts by weight of polyester PET, 8 parts by weight of epoxy resin, 11 parts by weight of polyurethane, 5 parts by weight of carbon black, 6 parts by weight of additive KH550 and 12 parts by weight of butyl acetate solvent, and the topcoat including 41 parts by weight of epoxy resin, 24 parts by weight of polyurethane, 16 parts by weight of methyl acrylate, 4 parts by weight of carbon black, 10 parts by weight of corundum, 1 part by weight of wax powder, 2 parts by weight of additive KH550 and 2 parts by weight of butyl acetate solvent.

[0070] Example 2

[0071] The present embodiment provides a micro-ceramic ink, which includes a primer and a topcoat, the primer including 62 parts by weight of polyester PET, 8 parts by weight of epoxy resin, 11 parts by weight of polyurethane, 5 parts by weight of carbon black, 7 parts by weight of additive KH550 and 7 parts by weight of butyl acetate solvent, and the topcoat including 40 parts by weight of epoxy resin, 20 parts by weight of polyurethane, 12 parts by weight of methyl acrylate, 6 parts by weight of titanium dioxide, 15 parts by weight of SiO2, 1.5 parts by weight of wax powder, 2.5 parts by weight of additive KH550 and 3 parts by weight of butyl acetate solvent.

[0072] Example 3

[0073] The present embodiment provides a micro-ceramic ink, which includes a primer and a topcoat, the primer including 62 parts by weight of polyester PET, 8 parts by weight of epoxy resin, 11 parts by weight of polyurethane, 5 parts by weight of carbon black, 7 parts by weight of additive KH550 and 7 parts by weight of butyl acetate solvent, and the topcoat including 36 parts by weight of epoxy resin, 16 parts by weight of polyurethane, 11 parts by weight of methyl acrylate, 5 parts by weight of carbon black, 25 parts by weight of corundum (after coupling treatment), 1.5 parts by weight of wax powder, 2.5 parts by weight of additive KH550 and 3 parts by weight of butyl acetate solvent.

[0074] Among them, the coupling treatment of corundum is as follows: take coupling agent KH550 and water in a volume ratio of 1:4 and add them to a container, heat in a water bath at 60°C, and stir for 2 hours to obtain a coupling agent hydrolyzate; mix the obtained coupling agent hydrolyzate with ethanol in a volume ratio of 12:88, and place for 40 minutes after mixing evenly to obtain a coupling agent dilution; add corundum to a high-speed mixer, preheat at 90°C for 20 minutes, and spray the coupling agent dilution onto the corundum in the high-speed mixer several times to evenly disperse the coupling agent on the surface of the corundum, so as to obtain the coupling-treated corundum.

[0075] Example 4

[0076] This embodiment provides a micro-ceramic ink, which includes a primer and a topcoat, wherein the primer includes 62 parts by weight of polyester PET, 8 parts by weight of epoxy resin, 11 parts by weight of polyurethane, 5 parts by weight of carbon black, 7 parts by weight of auxiliary agent KH550 and 7 parts by weight of butyl acetate solvent, and the topcoat includes 36 parts by weight of epoxy resin, 16 parts by weight of polyurethane, 11 parts by weight of methyl acrylate, 5 parts by weight of carbon black, 25 parts by weight of corundum, 1.5 parts by weight of wax powder, 2.5 parts by weight of auxiliary agent KH550 and 3 parts by weight of butyl acetate solvent. That is, in this embodiment, the corundum is not subjected to coupling treatment, and other conditions are the same as those in Example 3.

[0077] Example 5

[0078] This embodiment provides a micro-ceramic ink, which includes a primer and a topcoat, wherein the primer includes 55 parts by weight of polyester PET, 10 parts by weight of epoxy resin, 4 parts by weight of polyurethane, 10 parts by weight of carbon black, 3 parts by weight of auxiliary agent KH550 and 18 parts by weight of butyl acetate solvent, and the topcoat includes 20 parts by weight of epoxy resin, 24 parts by weight of polyurethane, 7 parts by weight of methyl acrylate, 10 parts by weight of carbon black, 29 parts by weight of corundum (after coupling treatment), 3 parts by weight of wax powder, 1 part by weight of auxiliary agent KH550 and 6 parts by weight of butyl acetate solvent. Among them, the coupling treatment process of corundum is the same as that of Example 3.

[0079] Example 6

[0080] This embodiment provides a micro-ceramic ink, which includes a primer and a topcoat, wherein the primer includes 62 parts by weight of polyester PET, 5 parts by weight of epoxy resin, 16 parts by weight of polyurethane, 1 part by weight of carbon black, 8 parts by weight of auxiliary agent KH550 and 8 parts by weight of butyl acetate solvent, and the topcoat includes 41 parts by weight of epoxy resin, 16 parts by weight of polyurethane, 16 parts by weight of methyl acrylate, 1 part by weight of carbon black, 18.5 parts by weight of corundum (after coupling treatment), 0.5 parts by weight of wax powder, 6 parts by weight of auxiliary agent KH550 and 1 part by weight of butyl acetate solvent. Among them, the coupling treatment process of corundum is the same as that of Example 3.

[0081] Example 7

[0082] This embodiment provides a method for preparing a micro-ceramic ink, which is used to prepare the micro-ceramic ink provided in Examples 1 to 6. The method comprises: adding the raw materials of the primer into a blender according to a ratio, mixing them, stirring them at 1500 rpm for 120 minutes, filtering them with a 200-mesh filter screen, and obtaining a primer; adding the raw materials of the topcoat into a blender according to a ratio, mixing them, stirring them at 1500 rpm for 120 minutes, filtering them with a 200-mesh filter screen, and obtaining a topcoat.

[0083] Example 8

[0084] This embodiment provides a micro-ceramic coating plate, which includes a substrate layer, a primer layer and a topcoat layer. The primer layer and the topcoat layer are formed by the micro-ceramic ink of Example 1, the primer layer is formed by coating the primer on one side of the substrate layer, and the topcoat layer is formed by coating the topcoat on the side of the primer layer away from the substrate layer; the substrate layer is a galvanized steel sheet SECC.

[0085] Example 9

[0086] This embodiment provides a micro-ceramic coating board for whiteboard writing, which includes a substrate layer, a primer layer and a topcoat layer. The primer layer and the topcoat layer are formed by the micro-ceramic ink of Example 2, the primer layer is formed by coating the primer on one side of the substrate layer, and the topcoat layer is formed by coating the topcoat on the side of the primer layer away from the substrate layer; the substrate layer is made of a glass plate.

[0087] Example 10

[0088] This embodiment provides a micro-ceramic coating board for blackboards used in the education industry, which includes a substrate layer, a primer layer and a topcoat layer. The primer layer and the topcoat layer are formed by the micro-ceramic ink of Example 3, the primer layer is formed on one side of the substrate layer by primer coating, and the topcoat layer is formed on the side of the primer layer away from the substrate layer by topcoat coating; the substrate layer is made of galvanized steel sheet SECC.

[0089] Embodiment 11

[0090] This embodiment provides a micro-ceramic coating board for blackboards used in the education industry, which includes a substrate layer, a primer layer and a topcoat layer. The primer layer and the topcoat layer are formed by the micro-ceramic ink of Example 4, the primer layer is formed on one side of the substrate layer by primer coating, and the topcoat layer is formed on the side of the primer layer away from the substrate layer by topcoat coating; the substrate layer is made of galvanized steel sheet SECC.

[0091] Example 12

[0092] This embodiment provides a micro-ceramic coating board for blackboards used in the education industry, which includes a substrate layer, a primer layer and a topcoat layer. The primer layer and the topcoat layer are formed by the micro-ceramic ink of Example 5, the primer layer is formed on one side of the substrate layer by primer coating, and the topcoat layer is formed on the side of the primer layer away from the substrate layer by topcoat coating; the substrate layer is made of galvanized steel sheet SECC.

[0093] Embodiment 13

[0094] This embodiment provides a micro-ceramic coating board for blackboards used in the education industry, which includes a substrate layer, a primer layer and a topcoat layer. The primer layer and the topcoat layer are formed by the micro-ceramic ink of Example 6, the primer layer is formed by coating the primer on one side of the substrate layer, and the topcoat layer is formed by coating the topcoat on the side of the primer layer away from the substrate layer; the substrate layer is made of galvanized steel sheet SECC.

[0095] Embodiment 14

[0096] This embodiment provides a method for preparing a micro-ceramic coating plate, which is used to prepare the micro-ceramic coating plate provided in Examples 8 to 13. The method comprises the following steps: preparing a substrate and a micro-ceramic ink; applying a primer uniformly and continuously on the substrate by a roller coating (scraping) device to form a coating with a thickness of 12 μm, and baking it in a 220°C baking device for 50 seconds to form a primer layer; applying a topcoat uniformly and continuously on the primer layer by a roller coating (scraping) device to form a coating with a thickness of 20 μm, and baking it in a 230°C baking device (including but not limited to a tunnel furnace, an oven, a tower furnace, etc.) for 50 seconds to form a topcoat layer; cutting into a specified size and packaging.

[0097] Embodiment 15

[0098] This embodiment provides a method for preparing a micro-ceramic coating plate, which is used to prepare the micro-ceramic coating plate provided in Examples 8 to 13. The method comprises the following steps: preparing a substrate and a micro-ceramic ink; applying the primer uniformly and continuously on the substrate through a spraying device to form a coating with a thickness of 12 μm, and baking it in a 220°C baking device for 50 seconds to form a primer layer; applying the topcoat uniformly and continuously on the primer layer through a spraying device to form a coating with a thickness of 20 μm, and baking it in a 230°C baking device (including but not limited to a tunnel furnace, an oven, a tower furnace, etc.) for 50 seconds to form a topcoat layer; cutting into a specified size and packaging. That is, in the process of preparing the micro-ceramic coating plate in this embodiment, the spraying equipment is used to complete the coating of the primer and the topcoat, and the other conditions are the same as those in Example 14.

[0099] Comparative Example 1

[0100] This comparative example provides a coated plate, in which polyester is not added to the primer, and the added amounts of epoxy resin and polyurethane in the primer are 37 parts by weight and 40 parts by weight, respectively, and other conditions are the same as those in Example 8.

[0101] Comparative Example 2

[0102] This comparative example provides a coated plate, in which epoxy resin and polyurethane are not added to the primer, the amount of polyester added to the primer is 77 parts by weight, and other conditions are the same as those in Example 8.

[0103] Comparative Example 3

[0104] This comparative example provides a coated plate, in which no epoxy resin is added to the primer, the amount of polyurethane added to the primer is 19 parts by weight, and other conditions are the same as those in Example 8.

[0105] Comparative Example 4

[0106] This comparative example provides a coated plate, in which no polyurethane is added to the primer, the amount of epoxy resin added to the primer is 19 parts by weight, and other conditions are the same as those in Example 8.

[0107] Comparative Example 5

[0108] This comparative example provides a coated plate, in which no acrylate is added to the topcoat, and the added amounts of epoxy resin and polyurethane in the topcoat are 49 parts by weight and 32 parts by weight, respectively, and other conditions are the same as those in Example 8.

[0109] The formulas of the primer and topcoat in Examples 8 to 10 and Comparative Examples 1 to 5 are shown in Table 1.

[0110] Table 1 Formulas of primer and topcoat in Examples 8 to 10 and Comparative Examples 1 to 5

[0111]

[0112] The micro-ceramic coated plates of Examples 8, 9, 11 to 13 and the coated plates of Comparative Examples 1 to 5 were prepared by the method provided in Example 14, and the micro-ceramic coated plate of Example 10 was prepared by the methods provided in Example 14 (roller coating) and Example 15 (spray coating), respectively. The prepared micro-ceramic coated plates and coated plates were tested according to the test standards, and the test results of the non-blackboard type are shown in Table 2 below, and the test results of the blackboard type are shown in Table 3.

[0113] Table 2 Test results of non-blackboard class

[0114]

[0115] Table 3 Test results of blackboard class

[0116]

[0117] It can be seen from Examples 8 to 13 that the micro-ceramic coating plate made according to the embodiments of the present application has the basic characteristic of a hardness exceeding 9H. From the alcohol friction test, acid and alkali solvent resistance test, and hundred-grid peeling test, it can be seen that its wear resistance and overall service life for products have been improved; at the same time, from the preparation methods provided in Examples 7 and 14 to 15, it can be seen that it adopts a highly efficient production process, and from Examples 1 to 6, it can be seen that it adopts environmentally friendly, low-priced and easily accessible production raw materials, which better controls the production cost. From the comparison of Comparative Examples 1 to 5 with Example 8, it can be seen that the improvement of the hardness, wear resistance, corrosion resistance and coating adhesion of the micro-ceramic coating plate in the embodiments of the present application is inseparable from the compounding of polyester, epoxy resin and polyurethane in the primer and epoxy resin, polyurethane and acrylate in the topcoat. Among them, Comparative Example 1 does not contain polyester, the adhesion of the coating is reduced, and the test result of the hundred-grid peeling test after boiling is unqualified; at the same time, the epoxy resin component is significantly higher than other components, resulting in an extension of the curing and drying time, affecting production efficiency; Comparative Example 2 has low content of epoxy resin and polyurethane, resulting in a significant reduction in its own adhesion, and the conventional hundred-grid peeling test is unqualified. In addition, the cancellation of polyurethane also causes the weather resistance of the coating to deteriorate; Comparative Example 3 has low content of epoxy resin, the adhesion of the coating itself deteriorates, and the conventional hundred-grid peeling test is unqualified; Comparative Example 4 has high content of epoxy resin, increased curing time, reduced production efficiency, low content of polyurethane, and poor aging resistance. Comparative Example 5 does not contain acrylate, the acid and alkali resistance of the coating is reduced, bubbles appear during the acid and alkali resistance test, and it cannot meet the requirement of not falling off for 48 hours.

[0118] In addition to the conventional covering and protection functions, the micro-ceramic coated board can also be used as a board for writing in some occasions, such as writing with ink pens, writing with chalk, and writing on electronic whiteboards, and is suitable for use in some scenarios such as the education industry, business offices, etc. For example, Example 9 provides a micro-ceramic coated board for whiteboard writing.

[0119] For the blackboard in the education industry, there is a common problem in the industry, that is, the problem of powdering and wiping when writing with chalk. It should be easy to hang powder so that the display effect after writing with chalk is good, and it should also be easy to wipe off for easy cleaning after writing. However, there are dozens of common types of chalk in the industry, and it is difficult for conventional blackboard coatings to match so many types of chalk at the same time to achieve good powdering and wiping effects. In response to this problem, Example 10 proposes a solution to this industry problem based on Example 8, which adjusts the weight ratio of corundum in the topcoat to 25%, and couples the corundum before adding the material. The obtained micro-ceramic coating board not only has the basic characteristics of a hardness of more than 9H, but also has a good chalk powdering effect, which is suitable for the substrate requirements of coated boards for educational blackboards. Its basic principle is to use the loose porous structure of corundum itself and the early coupling treatment to improve the chalk powdering effect. Embodiment 10 to which corundum was coupled was qualified in the adhesion test of all chalk types on the market. In comparison, embodiment 11 to which corundum was not coupled was qualified in the adhesion test of most chalk types, which met the product requirements as a whole, but the adhesion test results of very few chalk types were unsatisfactory, which shows that the coupling treatment has a positive effect on the powder hanging effect; in the adhesion test of the blackboard to the chalk, the test results of preparing the micro-ceramic coated board of embodiment 10 by the method provided by embodiment 14 (roller coating) and embodiment 15 (spraying) show that the lines of the chalk on the coating board obtained by the roller coating and spraying processes are uniform and distinct, which meet the product requirements, but the chalk lines on the coating board obtained by the roller coating process are deeper than the chalk lines on the coating board obtained by the spraying process. From the above comparison, it can be seen that the roller coating process can further enhance the powder hanging effect.

[0120] In summary, the primer and topcoat in the micro-ceramic ink of the present application each have their own functions and complement each other, and can be strongly attached to common substrates such as metal plates, glass plates, and ceramic plates. There is no need to surface treat the substrate before coating. After coating, a high-hardness, wear-resistant, and corrosion-resistant coating is formed on the surface of the substrate, which forms a covering and protective effect on the substrate, which is conducive to improving the overall service life. At the same time, it has an excellent wiping effect and can be used as a writing board for ink pens, oil pens, etc. More importantly, it has a superior powder hanging effect and is very suitable for chalk writing and wiping, especially for chalks of up to dozens of different systems on the market. A good powder hanging effect can be achieved, which can be used as a teaching blackboard, suitable for business, conferences, education, and many other different fields. In addition, the embodiment of the present application uses environmentally friendly, low-cost, and easily accessible production raw materials and a highly efficient production process to prepare a micro-ceramic coated board, which better controls the overall production cost and is suitable for promotion and application.

[0121] In addition, in the present application, in addition to the raw materials and process parameters specifically selected in the above embodiments, polyester can also be selected from polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyarylate (PAR); acrylate can also be selected from methyl acrylate, ethyl acrylate, 2-methyl methacrylate, and 2-ethyl methacrylate; pigments can also be selected from titanium dioxide, etc.; additives can also include emulsifiers, plasticizers, and dispersants; solvents can also be selected from cyclohexanone, n-butanol, xylene, etc.; in the preparation of micro-ceramic ink, the stirring speed of the stirrer can be adjusted at 1000-1800 rpm, the stirring time is controlled at 100-150 min, and a 100-300 mesh filter can be selected after stirring. Filter; in the production process of micro-ceramic coating plates, the full coating thickness of the primer can be controlled at 8-16μm, and after coating, it can be baked at 210-250℃ for 25-60s, and the full coating thickness of the topcoat can be controlled at 15-25μm, and after coating, it can be baked at 220-250℃ for 25-60s; in the coupling treatment of corundum or SiO2, the volume ratio of the coupling agent to water can be controlled at 1:3-1:5, the temperature of the water bath heating can be controlled at 50-75℃, and the duration can be controlled at 1-3h, the coupling agent hydrolyzate and ethanol can be mixed at a volume ratio of 5:95-20:80, and placed evenly for 20-60min, and the corundum or SiO2 is added to the high-speed mixer and preheated at 80-100℃ for 10-30min.

[0122] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A micro-ceramic ink, characterized in that: The invention comprises a primer and a topcoat, wherein the primer comprises 55-62wt% of polyester, 5-10wt% of epoxy resin, 4-16wt% of polyurethane, 1-10wt% of pigment, 2-8wt% of auxiliary agent and 8-18wt% of solvent, and the topcoat comprises 20-41wt% of epoxy resin, 16-24wt% of polyurethane, 7-16wt% of acrylate, 1-10wt% of pigment, 15-30wt% of corundum or SiO2, 0.5-3wt% of wax powder, 1-6wt% of auxiliary agent and 1-6wt% of solvent, and the corundum or SiO2 is subjected to coupling treatment, and the coupling treatment comprises the following steps: Add the coupling agent and water into a container, heat in a water bath, and stir to obtain a coupling agent hydrolyzate; The coupling agent hydrolyzate is mixed evenly with ethanol and allowed to stand to obtain a coupling agent dilution solution; Add corundum or SiO2 into a high-speed mixer for preheating, and spray the coupling agent dilution onto the corundum or SiO2 in the high-speed mixer in multiple times to evenly disperse the coupling agent on the surface of the corundum or SiO2; The acrylic acid ester is selected from at least one of methyl acrylate, ethyl acrylate, 2-methyl methacrylate or 2-ethyl methacrylate.

2. The micro-ceramic ink according to claim 1, characterized in that: The polyester is selected from at least one of polyethylene terephthalate, polybutylene terephthalate or polyarylate.

3. The micro-ceramic ink according to claim 1, characterized in that: The pigment is selected from carbon black or titanium dioxide.

4. The micro-ceramic ink according to claim 1, characterized in that: The auxiliary agent is selected from at least one of an emulsifier, a plasticizer, a coupling agent or a dispersant.

5. The micro-ceramic ink according to claim 1, characterized in that: The solvent is selected from at least one of cyclohexanone, n-butanol, xylene or butyl acetate.

6. The micro-ceramic ink according to claim 1, characterized in that: In the step of obtaining the coupling agent hydrolyzate, the coupling agent and water are added in a volume ratio of 1:3 to 1:5, and / or the water bath heating is performed at 50 to 75° C. for 1 to 3 hours.

7. The micro-ceramic ink according to claim 1, characterized in that: In the step of obtaining the coupling agent dilution solution, the coupling agent hydrolyzate and ethanol are mixed at a volume ratio of 5:95 to 20:80, and / or are mixed evenly and then allowed to stand for 20 to 60 minutes.

8. The micro-ceramic ink according to claim 1, characterized in that: In the step of uniformly dispersing the coupling agent on the surface of corundum or SiO2, the corundum or SiO2 is preheated at 80-100°C for 10-30 minutes in a high-speed mixer.

9. A method for preparing the micro-ceramic ink according to any one of claims 1 to 8, characterized in that: The steps include: Mix the raw materials of the primer according to the proportion, stir evenly, and filter; The raw materials of the topcoat are mixed according to the proportion, stirred evenly, and filtered.

10. The method for preparing micro-ceramic ink according to claim 9, characterized in that: The stirring is performed at 1000-1800 rpm for 100-150 min; and / or the filtering is performed using a 100-300 mesh filter.

11. A micro-ceramic coated plate, characterized in that: The invention comprises a substrate layer, a primer layer and a topcoat layer, wherein the primer layer and the topcoat layer are formed by the micro-ceramic ink according to any one of claims 1 to 8, the primer layer is formed by coating the primer on one side of the substrate layer, and the topcoat layer is formed by coating the topcoat on the side of the primer layer away from the substrate layer.

12. The micro-ceramic coated plate according to claim 11, characterized in that: The sum of the thickness of the primer layer and the topcoat layer is 20-35 μm.

13. A method for preparing a micro-ceramic coated plate according to any one of claims 11 to 12, characterized in that: The steps include: Applying the primer evenly and continuously on the substrate, and baking to form the primer layer; The topcoat is evenly and continuously applied on the primer layer, and baked to form the topcoat layer.

14. The method for preparing a micro-ceramic coated plate according to claim 13, characterized in that: In the step of forming the primer layer, a roller coating device is used for full coating, and / or a coating with a thickness of 8 to 16 μm is formed after full coating, and / or after full coating, the coating is baked at 210 to 250° C. for 25 to 60 seconds; and / or In the step of forming the topcoat layer, a roller coating device is used for full coating, and / or after full coating, the topcoat layer is baked at 220-250° C. for 25-60 seconds.

15. A micro-ceramic coated plate, characterized in that: The invention comprises a substrate layer, a primer layer and a topcoat layer, wherein the primer layer and the topcoat layer are formed by the micro-ceramic ink prepared by the method according to any one of claims 9 to 10, the primer layer is formed on one side of the substrate layer by coating the primer, and the topcoat layer is formed on the side of the primer layer away from the substrate layer by coating the topcoat.

16. The micro-ceramic coated plate according to claim 15, characterized in that: The sum of the thickness of the primer layer and the topcoat layer is 20-35 μm.

17. A method for preparing a micro-ceramic coated plate according to any one of claims 15 to 16, characterized in that: The steps include: Applying the primer evenly and continuously on the substrate, and baking to form the primer layer; The topcoat is evenly and continuously applied on the primer layer, and baked to form the topcoat layer.

18. The method for preparing a micro-ceramic coating plate according to claim 17, characterized in that: In the step of forming the primer layer, a roller coating device is used to fully coat the primer layer, and / or the primer layer is baked at 210-250° C. for 25-60 seconds after being fully coated; and / or In the step of forming the topcoat layer, a roller coating device is used for full coating, and / or a coating with a thickness of 15 to 25 μm is formed after full coating, and / or after full coating, the coating is baked at 220 to 250° C. for 25 to 60 seconds.

19. Use of the micro-ceramic coated plate according to any one of claims 11 to 12, 15 to 16 in an erasable writing board.

20. The use of the micro-ceramic coating plate according to claim 19 in an erasable writing board, characterized in that: The writing board is suitable for both chalk and ink pen.

21. Use of the micro-ceramic coating plate prepared by the method according to any one of claims 13 to 14, 17 to 18 in an erasable writing board.

22. The use of the micro-ceramic coating plate according to claim 21 in an erasable writing board, characterized in that: The writing board is suitable for both chalk and ink pen.

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