Full-opening steel plate with coating as well as preparation method and application of full-opening steel plate

Abstract

The invention belongs to the technical field of precision printing, and relates to a full-opening steel plate with a coating and a preparation method and application thereof.The full-opening steel plate comprises a full-opening steel plate base body, the front face, the back face and the inner wall of an opening of the full-opening steel plate base body are each provided with a hydrophobic and oleophobic coating, or hydrophobic and oleophobic coatings are arranged on the inner wall of the opening of the full-opening steel plate base body. Hydrophobic and oleophobic coatings are arranged on the front face and the inner wall of an opening of the full-opening steel plate base body, and a friction increasing coating is arranged on the back face of the full-opening steel plate base body, or the hydrophobic and oleophobic coatings are arranged on the front face and the inner wall of the opening of the full-opening steel plate base body, and no coating is arranged on the back face of the full-opening steel plate base body. The hydrophobic and oleophobic coatings are arranged on the front face and the inner wall of the opening of the full-opening steel plate base body, and the hydrophobic and oleophobic coating and the friction increasing coating are selectively arranged on the back face of the full-opening steel plate base body or not arranged, so that the combination of the hydrophobic and oleophobic function and the friction increasing function can be achieved; the defects that when an existing steel plate is used, slurry is not thoroughly separated, the shaping effect is poor, and ink feeding is not full are overcome, the binding force of the coating and the steel plate base body is high, and the service life of the steel plate is long.

Description

Technical Field

[0001] This invention belongs to the field of precision printing technology, and relates to a coated, fully open steel plate, its preparation method, and its application. Background Technology

[0002] A fully open steel plate is a metal plate made by precision processing methods such as laser cutting on a stainless steel sheet of a specific thickness. It has through holes that perfectly correspond to the printed battery cell pattern and have vertically continuous hole walls. Alternatively, it can be made by electroplating or electroforming to deposit metal ions to create a metal plate with through holes that perfectly correspond to the printed battery cell pattern and have vertically continuous hole walls. Unlike traditional screen printing plates where there are no steel wires obstructing the ink application openings, a fully open steel plate is widely used in precision printing, paste forming, and other industrial fields. Its surface properties directly affect the paste release effect, shaping accuracy, and ink application uniformity, thus determining the product quality.

[0003] Currently, the existing fully open steel plate surface has the following technical defects: ① Because the steel plate surface is metallic and has high surface energy, the paste (especially the highly viscous paste) is prone to sticking to the steel plate surface, resulting in incomplete paste separation. This leads to defects such as burrs, deformation, and irregular edges in the formed products, poor shaping effect, and unstable performance, resulting in low production efficiency; ② Because the steel plate surface is smooth, the friction between it and the paste is insufficient, and the paste has poor rolling on the steel plate surface, which easily leads to accumulation and uneven flow. This results in insufficient ink application at the opening of the steel plate, uneven printing / forming patterns, and gaps, affecting product consistency.

[0004] In addition, existing functional coatings cannot simultaneously meet the core requirements of shaping and ink application. Furthermore, existing coatings have poor bonding stability with the steel substrate, insufficient wear resistance, and short service life, making them unsuitable for long-term industrial mass production.

[0005] Therefore, in order to address the above-mentioned technical problems, there is an urgent need to develop a fully open steel plate with a coating that has good plasticity, full ink application, and stable adhesion between the coating and the steel plate. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a coated fully open steel plate, its preparation method, and its application. By applying a hydrophobic and oleophobic coating to the front side and the inner wall of the opening of the fully open steel plate substrate, and selectively applying a hydrophobic and oleophobic coating, a friction-increasing coating, or no coating to the back side of the fully open steel plate substrate, this invention not only achieves highly efficient hydrophobic and oleophobic properties and effectively increases friction, solving the technical defects of existing fully open steel plates such as incomplete slurry separation, poor shaping effect, and insufficient ink application, but also improves the bonding force between the functional coating and the steel plate substrate, as well as the wear resistance of the resulting coated fully open steel plate. This effectively extends the service life of the steel plate, reduces production costs, and meets the needs of industrialized mass production.

[0007] To achieve this objective, the present invention adopts the following technical solution: In a first aspect, the present invention provides a coated fully open steel plate, the coated fully open steel plate comprising a fully open steel plate substrate; The front, inner wall of the opening, and back of the fully open steel plate substrate are all provided with a hydrophobic and oleophobic coating. Alternatively, the front side and the inner wall of the opening of the fully open steel plate substrate are provided with a hydrophobic and oleophobic coating, and the reverse side is provided with a friction-increasing coating. Alternatively, the front side and the inner wall of the opening of the fully open steel plate substrate are provided with a hydrophobic and oleophobic coating, while the reverse side is not provided with any coating.

[0008] In this invention, the "front side of the fully open stencil substrate" refers to the side surface that contacts the PCB or other printed circuit board during use, and the "back side of the fully open stencil substrate" refers to the scraper surface, which is opposite to the front side.

[0009] The coated fully open steel plate provided by this invention includes a fully open steel plate substrate. On one hand, by providing a hydrophobic and oleophobic coating on the front side and the inner wall of the opening of the fully open steel plate substrate, the hydrophobic and oleophobic effect of the front side of the steel plate is effectively improved, thereby effectively reducing the adhesion of the slurry to the front side of the fully open steel plate. This allows the slurry to quickly and completely detach from the steel plate, avoiding defects such as burrs and deformation in the molded product, significantly improving the shaping accuracy, and eliminating the need for an additional demolding process, reducing production costs and improving production efficiency. On the other hand, by selectively providing a hydrophobic and oleophobic coating, a friction-increasing coating, or no coating on the reverse side of the fully open steel plate substrate, the two coatings can be used individually, and the specific choice can be made according to the actual situation: ① If the slurry has high viscosity and easily adheres to the surface of the steel plate, or if a side-shaping effect of the product is required... ① If the viscosity of the slurry used is reduced, or if the product requires full ink coverage, a friction-enhancing layer is applied to the reverse side of the fully open steel plate substrate, and a hydrophobic or oleophobic coating or a friction-enhancing coating is applied to the inner wall of the opening. The friction-enhancing coating forms a microstructure with a specific roughness, which increases the friction between the slurry and the steel plate surface, and guides the slurry to roll smoothly on the steel plate surface, avoiding slurry accumulation and uneven flow, so that the slurry is evenly distributed at the opening of the steel plate, achieving full ink coverage, uniform printing or forming patterns, and improving product quality and consistency. ② If the viscosity of the slurry used is moderate, or if the product requires lower requirements for full ink coverage and shaping effect, no coating needs to be applied to the reverse side of the fully open steel plate substrate.

[0010] In summary, this invention, by applying a hydrophobic and oleophobic coating to the front side and inner wall of the opening of a fully open steel plate substrate, and selectively applying a hydrophobic and oleophobic coating, a friction-increasing coating, or no coating to the back side of the fully open steel plate substrate, not only achieves highly efficient hydrophobic and oleophobic properties and effectively increases friction, thus solving the technical defects of existing fully open steel plates such as incomplete slurry detachment, poor shaping effect, and insufficient ink application, but also improves the adhesion between the functional coating and the steel plate substrate and the wear resistance of the resulting coated fully open steel plate. This effectively extends the service life of the steel plate, reduces production costs, and meets the needs of industrialized mass production.

[0011] Preferably, the thickness of the fully open steel plate substrate is 0.01~0.05 mm, such as 0.01 mm, 0.015 mm, 0.02 mm, 0.025 mm, 0.03 mm, 0.035 mm, 0.04 mm, 0.045 mm or 0.05 mm.

[0012] Preferably, the opening width of the fully open steel plate is 0.005~0.05 mm, such as 0.005 mm, 0.01 mm, 0.015 mm, 0.002 mm, 0.025 mm, 0.003 mm, 0.004 mm or 0.005 mm, etc.

[0013] Preferably, the hydrophobic and oleophobic coating includes an adhesive underlayer and a hydrophobic and oleophobic layer, and the adhesive underlayer is disposed on the side close to the fully open steel plate substrate.

[0014] Preferably, the friction-enhancing coating comprises an adhesive underlayer and a friction-enhancing layer, and the adhesive underlayer is disposed on the side close to the fully open steel plate substrate.

[0015] As a preferred technical solution of the present invention, both the hydrophobic and oleophobic coatings and the friction-increasing coatings are provided with an adhesive underlayer, which can effectively enhance the bonding force between the coating and the steel plate substrate, improve the interfacial bonding between the layers, reduce the risk of coating peeling and delamination, and increase the service life of the resulting fully open steel plate with coating.

[0016] Preferably, the thickness of the adhesive underlayer is 50~100 nm, such as 50 nm, 55 nm, 60 nm, 65 nm, 70 nm, 75 nm, 80 nm, 85 nm, 90 nm, 95 nm or 100 nm.

[0017] Preferably, the raw materials of the bonding underlayer include modified epoxy resin-based adhesive and silane coupling agent; by adding silane coupling agent, the interfacial bonding performance between the bonding underlayer and the steel plate substrate, and between the bonding underlayer and the hydrophobic and oleophobic layer (or friction-increasing layer) can be improved, thereby enhancing the overall stability of the coating and extending the service life of the steel plate.

[0018] Preferably, the silane coupling agent accounts for 2 to 5% of the mass of the modified epoxy resin-based adhesive, for example, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, or 5%.

[0019] Preferably, the silane coupling agent comprises γ-(methacryloyloxy)propyltrimethoxysilane (KH570).

[0020] Preferably, the thickness of the hydrophobic and oleophobic layer is 10~50 nm, such as 10 nm, 15 nm, 17 nm, 19 nm, 21 nm, 23 nm, 25 nm, 27 nm, 29 nm, 31 nm, 33 nm, 35 nm, 40 nm, 45 nm or 50 nm.

[0021] Preferably, the water contact angle of the hydrophobic and oleophobic layer is ≥110°, such as 110°, 112°, 114°, 116°, 118°, 120°, 125°, 130°, 135°, 140°, 145° or 150°.

[0022] In this invention, the water contact angle of the hydrophobic and oleophobic layer is obtained by measuring the contact angle using a contact angle meter.

[0023] Preferably, the oil contact angle of the hydrophobic and oleophobic layer is ≥70°, such as 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120° or 125°.

[0024] In this invention, the oil contact angle of the hydrophobic and oleophobic layer is obtained by measuring the contact angle using a contact angle meter.

[0025] Preferably, the surface energy of the hydrophobic and oleophobic layer is ≤20 mJ / m 2 For example, 20 mJ / m 2 18 mJ / m 2 16 mJ / m 2 14 mJ / m 2 12 mJ / m 2 or 10 mJ / m 2 wait.

[0026] In this invention, the surface energy of the hydrophobic and oleophobic layer is obtained by contact angle testing.

[0027] Preferably, the raw materials for the hydrophobic and oleophobic layer include low surface energy materials and nanofillers, wherein the low surface energy material includes polydimethylsiloxane and / or polytetrafluoroethylene; the composite of low surface energy materials and nanofillers can effectively reduce the adhesion between the slurry and the steel plate surface, optimize the hydrophobic and oleophobic properties, and ensure smooth slurry separation.

[0028] Preferably, the mass of the nanofiller accounts for 5-15% of the mass of the low surface energy material, such as 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, or 15%.

[0029] Preferably, the nanofiller comprises nano-silica and / or graphene.

[0030] Preferably, the thickness of the friction-enhancing layer is 10~50 nm, such as 10 nm, 15 nm, 17 nm, 19 nm, 21 nm, 23 nm, 25 nm, 27 nm, 29 nm, 31 nm, 33 nm, 35 nm, 40 nm, 45 nm or 50 nm.

[0031] Preferably, the surface roughness of the friction-enhancing layer is 0.8~2 μm, such as 0.8 μm, 0.9 μm, 1 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm or 2 μm.

[0032] In this invention, the surface roughness of the friction-enhancing layer is obtained by testing with a surface roughness meter.

[0033] Preferably, the raw materials of the friction-enhancing layer include wear-resistant resin and inorganic wear-resistant filler, and it is made by combining wear-resistant resin and inorganic wear-resistant particles. The micro-rough surface enhances the intermolecular friction, taking into account both friction and rolling requirements, and avoiding slurry accumulation and uneven flow.

[0034] Preferably, the wear-resistant resin includes polyurethane resin and / or polyimide resin.

[0035] Preferably, the inorganic wear-resistant filler accounts for 10-25% of the mass of the wear-resistant resin, for example, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, or 25%.

[0036] Preferably, the inorganic wear-resistant filler comprises alumina and / or silicon carbide.

[0037] Secondly, the present invention provides a method for preparing a fully open steel plate with a coating as described in the first aspect, characterized in that the preparation method includes the following steps: A hydrophobic and oleophobic coating is formed on the front, back, reverse side, and inner wall of the opening of the fully open steel plate substrate; Alternatively, a hydrophobic and oleophobic coating may be formed on the front side and the inner wall of the opening of the fully open steel plate substrate, and a friction-increasing coating may be formed on the reverse side. Alternatively, a hydrophobic and oleophobic coating may be formed only on the front side of the fully open steel substrate and on the inner wall of the opening.

[0038] Preferably, the fully open steel plate substrate is a pretreated fully open steel plate substrate.

[0039] Preferably, the pretreatment includes the steps of degreasing, rust removal, cleaning, and drying.

[0040] Preferably, the degreasing method includes: immersing the fully open steel plate substrate in an aqueous solution of an alkaline degreasing agent with a mass percentage of 5-10% (e.g., 5%, 6%, 7%, 8%, 9%, or 10%) for 10-20 minutes (e.g., 10 minutes, 12 minutes, 14 minutes, 16 minutes, 18 minutes, or 20 minutes) at 40-60°C (e.g., 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, 52°C, 54°C, 56°C, 58°C, or 60°C, etc.) to remove surface oil stains, thus completing the degreasing step.

[0041] Preferably, the rust removal method includes: immersing the degreased, fully open steel plate substrate in a hydrochloric acid aqueous solution with a mass percentage of 10-15% (e.g., 10%, 11%, 12%, 13%, 14%, or 15%) for 5-10 minutes (e.g., 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes) at ( ) °C to remove surface oxide scale and rust, thus completing the rust removal step.

[0042] Preferably, the cleaning is performed using deionized water to remove residual degreasing agent, acid, and impurities from the surface of the fully open steel plate substrate.

[0043] Preferably, the drying temperature is 30~45℃, such as 30℃, 32℃, 34℃, 36℃, 38℃, 40℃, 42℃, 44℃ or 45℃.

[0044] Preferably, the drying time is 15 to 30 minutes, such as 15 minutes, 17 minutes, 19 minutes, 21 minutes, 23 minutes, 25 minutes, 27 minutes, 29 minutes, or 30 minutes.

[0045] Preferably, the drying process uses hot air drying to ensure that the surface of the steel plate is free of moisture and impurities.

[0046] Preferably, the method for forming a hydrophobic and oleophobic coating includes forming an adhesive underlayer and forming a hydrophobic and oleophobic layer.

[0047] Preferably, the method for forming the friction-enhancing coating includes forming an adhesive underlayer and forming a friction-enhancing layer.

[0048] Preferably, the methods for forming the bonding underlayer, the hydrophobic and oleophobic layer, and the friction-increasing layer all include deposition or coating methods.

[0049] Preferably, the deposition method includes vapor deposition or sputtering.

[0050] Preferably, the coating method includes scraping or spraying.

[0051] In this invention, if a deposition method is used to form an adhesive underlayer, a hydrophobic and oleophobic layer, or a friction-enhancing layer, the raw materials of the desired coating can be directly added to the relevant equipment for vapor deposition or sputtering, thereby directly forming the adhesive underlayer, the hydrophobic and oleophobic layer, or the friction-enhancing layer.

[0052] In this invention, if a coating method is used to form the adhesive underlayer, the specific method includes: mixing a modified epoxy resin-based adhesive and a silane coupling agent in solvent A, scraping or spraying the mixture onto a fully open steel plate substrate, and curing it to form the adhesive underlayer.

[0053] Preferably, the mass percentage of modified epoxy resin-based adhesive in the mixed slurry is 10-25%, such as 10%, 12%, 14%, 16%, 18%, 20%, 22%, or 25%.

[0054] Preferably, solvent A comprises ethanol and / or water.

[0055] Preferably, the curing temperature is 60~80℃, such as 60℃, 62℃, 64℃, 66℃, 68℃, 70℃, 72℃, 74℃, 76℃, 78℃ or 80℃.

[0056] Preferably, the curing time is 20 to 30 minutes, such as 20 minutes, 21 minutes, 22 minutes, 23 minutes, 24 minutes, 25 minutes, 26 minutes, 27 minutes, 28 minutes, 29 minutes, or 30 minutes.

[0057] In this invention, if a coating method is used to form a hydrophobic and oleophobic layer, the specific method includes: mixing a low surface energy material and a nanofiller in solvent B, coating or depositing the mixture onto an adhesive underlayer, and then pre-curing and secondary curing to form the hydrophobic and oleophobic layer.

[0058] Preferably, the mass percentage of low surface energy material in the mixed slurry is 15-40%, such as 15%, 20%, 25%, 30%, 35%, or 40%.

[0059] Preferably, solvent B includes acetone or ethanol.

[0060] Preferably, the mixing time is 20 to 30 minutes, such as 20 minutes, 21 minutes, 22 minutes, 23 minutes, 24 minutes, 25 minutes, 26 minutes, 27 minutes, 28 minutes, 29 minutes, or 30 minutes.

[0061] Preferably, the mixing is carried out under stirring conditions at a speed of 1500~2000 rpm (e.g., 1500 rpm, 1600 rpm, 1700 rpm, 1800 rpm, 1900 rpm or 2000 rpm).

[0062] Preferably, the pre-curing temperature is 100~120℃, such as 100℃, 102℃, 104℃, 106℃, 108℃, 110℃, 112℃, 114℃, 116℃, 118℃ or 120℃.

[0063] Preferably, the pre-curing time is 10 to 15 minutes, such as 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes, or 15 minutes.

[0064] Preferably, the temperature for the secondary curing is 150~180℃, such as 150℃, 155℃, 160℃, 165℃, 170℃, 175℃ or 180℃.

[0065] Preferably, the secondary curing time is 30-40 min, such as 30 min, 32 min, 34 min, 36 min, 38 min, or 40 min.

[0066] In this invention, if a coating method is used to form a friction-enhancing layer, the specific method includes: mixing wear-resistant resin and inorganic wear-resistant filler in solvent C, coating or depositing the mixture onto an adhesive underlayer, and curing it to form the friction-enhancing layer.

[0067] Preferably, the mass percentage of wear-resistant resin in the mixed slurry is 25-30%, such as 25%, 25.5%, 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, or 30%.

[0068] Preferably, the solvent C includes ethanol or ethyl acetate.

[0069] Preferably, the mixing includes first ultrasonic dispersion for 10-15 min (e.g., 10 min, 11 min, 12 min, 13 min, 14 min or 15 min, etc.), and then stirring for 20-30 min (e.g., 20 min, 22 min, 24 min, 26 min, 28 min or 30 min, etc.) at a speed of 1500-2000 rpm (e.g., 1500 rpm, 1600 rpm, 1700 rpm, 1800 rpm, 1900 rpm or 2000 rpm, etc.).

[0070] Preferably, the curing temperature is 25~40℃, such as 25℃, 27℃, 29℃, 31℃, 33℃, 35℃, 37℃, 39℃ or 40℃.

[0071] Preferably, the curing time is 25 to 35 minutes, such as 25 minutes, 26 minutes, 27 minutes, 28 minutes, 29 minutes, 30 minutes, 32 minutes, 34 minutes, or 35 minutes.

[0072] Thirdly, the present invention provides the application of a coated, fully open steel plate as described in the first aspect in precision printing.

[0073] Compared with the prior art, the present invention has the following beneficial effects: (1) The fully open steel plate with coating provided by the present invention has a hydrophobic and oleophobic coating on the front, back and inner wall of the opening, or the fully open steel plate substrate has a hydrophobic and oleophobic coating on the front and inner wall of the opening and a friction-increasing coating on the back, or the fully open steel plate substrate has a hydrophobic and oleophobic coating on the front and inner wall of the opening and no coating on the back; wherein, the hydrophobic and oleophobic coating can effectively reduce the adhesion between the slurry and the steel plate surface, so that the slurry can quickly and completely detach from the steel plate, avoid defects such as burrs and deformation in the formed product, significantly improve the shaping accuracy, and at the same time save the extra demolding process, reduce production costs and improve production efficiency. The friction-increasing coating increases the friction between the slurry and the steel plate surface and guides the slurry to roll smoothly on the steel plate surface, avoids slurry accumulation and uneven flow, so that the slurry is evenly distributed at the opening of the steel plate, achieves full ink application, uniform printing or forming pattern, and improves product quality and consistency; it solves the contradiction of "strong friction leads to poor rolling" in traditional friction-increasing coatings; (2) The preparation method of the coated full-opening steel plate provided by the present invention is simple and convenient to operate. The coating method is easy to realize industrial mass production, and the parameters of each step are easy to control, which can ensure the stability of the coating performance and is suitable for large-scale promotion and application. The coating material is widely available and the cost is controllable. No complicated equipment is required, which further reduces the production threshold. Detailed Implementation

[0074] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0075] The raw materials used in the following examples and comparative examples are all conventional materials in the art and can be obtained by purchasing commercially available products.

[0076] Example 1 A coated fully open steel plate includes a fully open steel plate substrate, wherein the front, back and the inside of the opening of the fully open steel plate substrate are provided with a hydrophobic and oleophobic coating. The thickness of the fully open steel plate substrate is 0.02 mm, and the opening width is 0.01 mm. The hydrophobic and oleophobic coating includes an adhesive underlayer and a hydrophobic and oleophobic layer; The adhesive underlayer, which is close to the surface of the fully open steel plate substrate, has a thickness of 50 nm and is made of modified epoxy resin-based adhesive and silane coupling agent accounting for 3 wt% of the modified epoxy resin-based adhesive. The hydrophobic and oleophobic layer has a thickness of 30 nm, a water contact angle of 125°, an oil contact angle of 75°, and a surface energy of 18 mJ / m². 2 The raw materials include polydimethylsiloxane and nano-silica accounting for 10 wt% of polydimethylsiloxane; The method for preparing a coated, fully open steel plate provided in Example 1 includes the following steps: (1) At 50°C, the fully open steel plate substrate is immersed in an 8% alkaline degreasing agent aqueous solution for 15 min to remove surface oil stains. Then it is immersed in a 12% hydrochloric acid aqueous solution for 8 min to remove surface oxide scale and rust. Then it is rinsed with deionized water to remove residual degreasing agent, acid and impurities. Then it is dried with hot air at 40°C for 25 min to obtain the pretreated fully open steel plate substrate. (2) The modified epoxy resin-based adhesive and 3 wt% of silane coupling agent are mixed in pure water (the mass percentage of modified epoxy resin-based adhesive in the resulting slurry is 20%). After mixing evenly, the mixture is scraped onto the front, back and inner wall of the pretreated open steel plate substrate obtained in step (1). After the scraping is completed, the substrate is placed in a curing oven and cured at 70°C for 20 min to form an adhesive underlayer. (3) Add polydimethylsiloxane and nano-silica accounting for 10 wt% of polydimethylsiloxane to acetone, stir at 1800 rpm for 25 min to make a uniform slurry (the mass percentage of polydimethylsiloxane in the slurry is 20%), and then spray it on the surface of the formed adhesive underlayer. After spraying, pre-curing at 110℃ for 10 min, then curing again at 180℃ for 35 min, and cooling to room temperature to form a hydrophobic and oleophobic coating to obtain the full-opening steel plate with the coating.

[0077] The fully open steel plate with coating provided in this embodiment 1 has excellent hydrophobic and oleophobic properties. During use, the slurry separates smoothly, the shaping accuracy is high, and the molded product is free of burrs and deformation. Moreover, the hydrophobic and oleophobic coating is firmly bonded to the steel plate substrate. After 1,000 friction tests, there is no peeling or wear, and the service life is significantly improved.

[0078] Example 2 A coated fully open steel plate includes a fully open steel plate substrate, wherein the front side and the inner wall of the opening of the fully open steel plate substrate are provided with a hydrophobic and oleophobic coating, and the reverse side is provided with a friction-increasing coating. The thickness of the fully open steel plate substrate is 0.04 mm, and the opening width is 0.008 mm. The hydrophobic and oleophobic coating includes an adhesive underlayer and a hydrophobic and oleophobic layer; The adhesive underlayer, which is close to the surface of the fully open steel plate substrate, has a thickness of 50 nm and is made of modified epoxy resin-based adhesive and silane coupling agent accounting for 2 wt% of the modified epoxy resin-based adhesive. The hydrophobic and oleophobic layer has a thickness of 30 nm, a water contact angle of 125°, an oil contact angle of 75°, and a surface energy of 18 mJ / m². 2 The raw materials include polydimethylsiloxane and nano-silica accounting for 10 wt% of polydimethylsiloxane; The friction-enhancing coating includes an adhesive underlayer and a friction-enhancing layer; The adhesive underlayer has a thickness of 50 nm on the side of the hydrophobic and oleophobic coating, and its raw materials include a modified epoxy resin-based adhesive and a silane coupling agent accounting for 2 wt% of the modified epoxy resin-based adhesive. The friction-enhancing layer has a thickness of 35 nm and a surface roughness of 0.8 μm. The raw materials include polyimide resin and silicon carbide accounting for 10 wt% of the polyimide resin. The method for preparing a coated, fully open steel plate provided in this embodiment includes the following steps: (1) At 50°C, the fully open steel plate substrate is immersed in an 8% alkaline degreasing agent aqueous solution for 15 min to remove surface oil stains. Then it is immersed in a 12% hydrochloric acid aqueous solution for 8 min to remove surface oxide scale and rust. Then it is rinsed with deionized water to remove residual degreasing agent, acid and impurities. Then it is dried with hot air at 40°C for 25 min to obtain the pretreated fully open steel plate substrate. (2) The modified epoxy resin-based adhesive and 2 wt% of silane coupling agent are mixed in pure water (the mass percentage of modified epoxy resin-based adhesive in the resulting slurry is 20%). After mixing evenly, the mixture is scraped onto the front, back and inner wall of the pretreated open steel plate substrate obtained in step (1). After the scraping is completed, the substrate is placed in a curing oven and cured at 70°C for 20 min to form an adhesive underlayer. (3) Add polydimethylsiloxane and nano-silica accounting for 10wt% of polydimethylsiloxane to acetone, stir at 1800 rpm for 25 min to make a uniform slurry (the mass percentage of polydimethylsiloxane in the slurry is 20%), and then spray it on the front side of the fully open steel plate substrate and the bonding substrate surface of the inner wall of the opening. After spraying, pre-curing at 110℃ for 10 min, then curing at 180℃ for 35 min, and cooling to room temperature to form a hydrophobic and oleophobic coating. Polyimide resin and silicon carbide (10 wt% of polyimide resin) were added to ethyl acetate, ultrasonically dispersed for 10 min, and then stirred at 1500 rpm for 30 min to form a uniform slurry (the mass percentage of polyimide resin in the slurry was 30%). The slurry was then sprayed onto the bonding underlayer surface on the reverse side of the fully open steel plate substrate, cured at 40°C for 35 min, and cooled to room temperature to form a friction-enhancing coating, thus obtaining the coated fully open steel plate.

[0079] The coated, fully open steel plate provided in this embodiment 2 has a fast ink release speed and leaves no residue, resulting in extremely high shaping accuracy. It is suitable for high-end, fine shaping scenarios. Furthermore, due to the sufficient friction of the friction-enhancing coating on the reverse side, the ink rolls evenly and stably, resulting in excellent ink fullness. It is also suitable for high-end, fine printing scenarios. At the same time, both coatings have high bonding strength with the steel plate substrate, excellent wear resistance and aging resistance, and comparable service life.

[0080] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A fully open steel plate with a coating, characterized in that, The coated, fully open steel plate includes a fully open steel plate substrate; The front, back, and inner wall of the opening of the fully open steel plate substrate are all provided with a hydrophobic and oleophobic coating. Alternatively, the front side and the inner wall of the opening of the fully open steel plate substrate are provided with a hydrophobic and oleophobic coating, and the reverse side is provided with a friction-increasing coating. Alternatively, the front side and the inner wall of the opening of the fully open steel plate substrate are provided with a hydrophobic and oleophobic coating, while the reverse side is not provided with any coating.

2. The coated, fully open steel plate according to claim 1, characterized in that, The thickness of the fully open steel plate substrate is 0.01~0.05 mm; Preferably, the opening width of the fully open steel plate is 0.005~0.05 mm.

3. The coated, fully open steel plate according to claim 1 or 2, characterized in that, The hydrophobic and oleophobic coating includes an adhesive underlayer and a hydrophobic and oleophobic layer, and the adhesive underlayer is disposed on the side close to the fully open steel plate substrate.

4. The coated, fully open steel plate according to any one of claims 1 to 3, characterized in that... The friction-enhancing coating includes an adhesive underlayer and a friction-enhancing layer, with the adhesive underlayer disposed on the side close to the fully open steel plate substrate.

5. The coated, fully open steel plate according to claim 3 or 4, characterized in that, The thickness of the adhesive substrate is 50~100 nm; Preferably, the raw materials of the adhesive underlayer include a modified epoxy resin-based adhesive and a silane coupling agent; Preferably, the silane coupling agent accounts for 2-5% of the mass of the modified epoxy resin-based adhesive; Preferably, the silane coupling agent comprises γ-(methacryloyloxy)propyltrimethoxysilane; Preferably, the thickness of the hydrophobic and oleophobic layer is 10~50 nm; Preferably, the hydrophobic and oleophobic layer has a water contact angle ≥110°, an oil contact angle ≥70°, and a surface energy ≤20 mJ / m². 2 ; Preferably, the raw materials for the hydrophobic and oleophobic layer include low surface energy materials and nanofillers, wherein the low surface energy material includes polydimethylsiloxane and / or polytetrafluoroethylene; Preferably, the mass of the nanofiller accounts for 5-15% of the mass of the low surface energy material; Preferably, the nanofiller comprises nano-silica and / or graphene; Preferably, the thickness of the friction-enhancing layer is 10~50 nm; Preferably, the surface roughness of the friction-enhancing layer is 0.8~2 μm; Preferably, the raw materials for the friction-enhancing layer include wear-resistant resin and inorganic wear-resistant filler; Preferably, the wear-resistant resin includes polyurethane resin and / or polyimide resin; Preferably, the inorganic wear-resistant filler accounts for 10-25% of the mass of the wear-resistant resin; Preferably, the inorganic wear-resistant filler comprises alumina and / or silicon carbide.

6. A method for preparing a coated, fully open steel plate as described in any one of claims 1 to 5, characterized in that, The preparation method includes the following steps: A hydrophobic and oleophobic coating is formed on the front, back, and inner wall of the opening of the fully open steel plate substrate; Alternatively, a hydrophobic and oleophobic coating may be formed on the front side and the inner wall of the opening of the fully open steel plate substrate, and a friction-increasing coating may be formed on the reverse side. Alternatively, a hydrophobic and oleophobic coating may be formed only on the front side of the fully open steel plate substrate and on the inner wall of the opening.

7. The preparation method according to claim 6, characterized in that, The fully open steel plate substrate is a pre-treated fully open steel plate substrate; Preferably, the pretreatment includes degreasing, rust removal, cleaning, and drying. Preferably, the degreasing method includes: immersing the fully open steel plate substrate in an aqueous solution of an alkaline degreasing agent with a mass percentage of 5-10% for 10-20 minutes at 40-60°C to remove surface oil stains, thus completing the degreasing step; Preferably, the rust removal method includes: immersing the degreased, fully open steel plate substrate in a hydrochloric acid aqueous solution with a mass percentage of 10-15% for 5-10 minutes at 20-40°C to remove surface oxide scale and rust, thus completing the rust removal step; Preferably, the drying temperature is 30~45℃ and the time is 15~30 min.

8. The preparation method according to claim 6 or 7, characterized in that, The method for forming a hydrophobic and oleophobic coating includes forming an adhesive underlayer and forming a hydrophobic and oleophobic layer; Preferably, the method for forming the friction-enhancing coating includes forming an adhesive underlayer and forming a friction-enhancing layer.

9. The preparation method according to claim 8, characterized in that, The methods for forming the bonding underlayer, the hydrophobic and oleophobic layer, and the friction-increasing layer all include deposition or coating methods. Preferably, the deposition method includes vapor deposition or sputtering; Preferably, the coating method includes scraping or spraying.

10. The application of a coated, fully open steel plate as described in any one of claims 1 to 5 in precision printing.