Novel multi-line-width and multi-opening screen structure and processing technology thereof
By coating the screen structure with a multifunctional coating, the problem of insufficient ink flow on the screen is solved, resulting in more efficient printing and improved printing efficiency and pattern accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- KUNSHAN HENGSHENG ELECTRONICS
- Filing Date
- 2026-01-30
- Publication Date
- 2026-05-15
AI Technical Summary
The ink flow of existing screen printing plates is limited by the fact that the physical and chemical properties of the working surface in contact with the ink have not been fully optimized, resulting in poor printing efficiency and pattern accuracy, and a high defect rate.
Employing a screen structure with multiple linewidths and openings, a multifunctional coating is applied to the surface of the screen body. This coating consists of a porous polymer substrate, quaternary ammonium salt ion polymer, and organic modified fillers, which improves the hydrophobicity, adhesion, and smoothness of the coating, while reducing the interfacial tension and flow resistance of the ink.
It improves the smoothness and uniformity of ink application during printing, enhances the bonding stability between the coating and the screen substrate, reduces the risk of ink residue and clogging, and improves printing production efficiency and pattern accuracy.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This application relates to the field of fine printing screen processing technology, and in particular to a novel screen structure with multiple linewidths and multiple openings and its processing technology. Background Technology
[0002] As a core component of industrial printing, the performance of printing screens directly determines the accuracy, consistency, and production efficiency of printed patterns. In fields such as photovoltaics, electronic circuits, and packaging printing, the smoothness of ink transfer directly determines printing efficiency, pattern accuracy, and continuous production stability. Whether the ink transfer is smooth or not not only affects the integrity of the graphic edges but also leads to increased defect rates and production costs due to blockages and flow interruptions.
[0003] In existing technologies, screen printing plates are typically optimized based on their structure (such as material composites and opening shapes) to improve ink delivery performance. However, the physicochemical properties of the working surface of the screen printing plate that is in direct contact with the ink (i.e., the inner wall of the ink delivery channel) are key interfacial factors affecting ink delivery smoothness, yet they have long been neglected and systematically underutilized. Summary of the Invention
[0004] To further improve the ink flow of the screen printing plate, this application provides a novel screen printing plate structure with multiple line widths and multiple openings, as well as its processing technology.
[0005] Firstly, this application provides a novel screen printing structure with multiple linewidths and multiple openings, employing the following technical solution: A novel multi-linewidth, multi-aperture screen structure includes a screen body and a multifunctional coating. The screen body comprises an ink reservoir layer, a substrate structure layer, and an aperture layer arranged sequentially. The multifunctional coating is formed by applying a multifunctional coating material to the surface of the screen body. The multifunctional coating material comprises the following components in parts by weight: 90-110 parts of porous polymer substrate, 10-12 parts of quaternary ammonium salt ion polymer, 14-18 parts of organic modified filler, 2-4 parts of dispersant, and 1-3 parts of leveling agent; The raw materials for preparing the porous polymer substrate include polydimethylsiloxane, polymethyl methacrylate, epoxy resin, and γ-aminopropyltriethoxysilane.
[0006] By adopting the above technical solution, a multifunctional coating is formed after coating the surface of the screen printing body with a multifunctional coating material. In the porous polymer substrate, the low surface energy of polydimethylsiloxane can effectively reduce the adhesion resistance between ink and coating. γ-aminopropyltriethoxysilane enhances the adhesion between the substrate and each layer of the screen printing body, reducing coating peeling and ink channel blockage. Polymethyl methacrylate and epoxy resin enhance the overall mechanical strength of the substrate, making the porous structure more stable. Quaternary ammonium salt ion polymer regulates the surface energy of the coating, further reducing the interfacial tension of the ink and assisting in rapid ink transfer. Organic modified fillers improve the smoothness of the coating surface and reduce ink retention.
[0007] Preferably, the porous polymer substrate is prepared by the following method: Polydimethylsiloxane was mixed with a curing agent, and then polymethyl methacrylate was added. After stirring, the mixture was obtained. Epoxy resin and γ-aminopropyltriethoxysilane were then mixed with the mixture, and the mixture was heated and stirred to obtain a porous polymer substrate.
[0008] By adopting the above technical solution, through a step-by-step mixing method, polydimethylsiloxane and curing agent are first allowed to fully react to form a basic hydrophobic framework, then polymethyl methacrylate is added to enhance structural stability, and finally it is mixed with epoxy resin and γ-aminopropyltriethoxysilane, so that each component is uniformly dispersed in the system. The resulting porous polymer substrate has uniform pore size and stable structure, and its hydrophobic properties, adhesion and mechanical strength have a better synergistic effect.
[0009] Preferably, the mass ratio of polydimethylsiloxane, polymethyl methacrylate and epoxy resin is 1:(0.55-0.65):0.23.
[0010] By adopting the above technical solution, the mass ratio of polydimethylsiloxane, polymethyl methacrylate and epoxy resin is preferably within the above range, so that the porous polymer substrate has excellent hydrophobic conductivity, structural stability and adhesion.
[0011] Preferably, the organic modified filler includes titanium dioxide, modified nano-silica, and mercapto-modified rosin.
[0012] By adopting the above technical solutions, titanium dioxide and modified nano-silica can fill the micropores of the porous polymer substrate, improve the surface smoothness of the coating, and improve the ink flow. The thiol groups in the thiol-modified rosin can combine with the active groups of the porous polymer substrate, improve the compatibility between the filler and the substrate, and prevent the filler from agglomerating into large particles that block the pores. At the same time, its rosin skeleton can enhance the wear resistance and corrosion resistance of the coating. The three work together to improve the surface morphology of the coating and enhance the bonding stability between the coating and the substrate.
[0013] Preferably, the organic modified filler is prepared by the following method: Rosin, N,N-diisopropylethylamine, and urea tetrafluoroborate were added to N,N-dimethylformamide, stirred, and then cysteamine was added. The reaction was continued with stirring. After the reaction, the mixture was washed to obtain mercapto-modified rosin. Anhydrous ethanol, dopamine, benzoyl peroxide, mercapto-modified rosin, titanium dioxide, and modified silica were mixed and ultrasonically treated to obtain an organic modified filler.
[0014] By adopting the above technical solution, thiol groups are introduced through cysteine, and impurities are removed by washing, thereby improving the purity of thiol-modified rosin and avoiding the influence of impurities on compatibility with other components. Dopamine can further enhance the binding force between the filler and subsequent coating components. The final organic modified filler has excellent dispersibility and good compatibility, and can more fully cooperate with the porous polymer substrate to improve the surface smoothness and structural stability of the coating.
[0015] Preferably, the mass ratio of the mercapto-modified rosin, titanium dioxide, and modified silica is (0.78-0.88):1:1.32.
[0016] By adopting the above technical solution, the mass ratio between mercapto-modified rosin, titanium dioxide, and modified silica is preferably within the above range. The amount of mercapto-modified rosin can fully exert its compatibility effect, avoid the agglomeration of titanium dioxide and modified nano silica, and the appropriate amount of titanium dioxide and modified nano silica can uniformly fill the pores of the substrate to improve the smoothness of the coating, and will not cause particle accumulation and blockage of the mesh due to excessive amount.
[0017] Preferably, the raw materials for preparing the quaternary ammonium salt ionomer include glycidyl methacrylate and methacryloyl ethyl sulfobetaine.
[0018] By adopting the above technical solution, the epoxy groups in glycidyl methacrylate can react with the active groups in the porous polymer substrate, thereby improving the compatibility between the quaternary ammonium salt ion polymer and the substrate and reducing the phenomenon of polymer agglomeration affecting the coating performance. Methacryloxyethyl sulfobetaine has zwitterionic properties, which further reduces the interfacial tension between the ink and the coating and reduces ink adhesion. The two work together to disperse the quaternary ammonium salt ion polymer in the coating, further improving the smoothness of ink application.
[0019] Preferably, the quaternary ammonium salt ionomer is prepared by the following method: Glycidyl methacrylate and methacryloyl ethyl sulfobetaine were mixed with ethanol and water, respectively, to obtain solutions of glycidyl methacrylate and methacryloyl ethyl sulfobetaine. The solutions of glycidyl methacrylate and methacryloyl ethyl sulfobetaine were then mixed, and an initiator and 3-mercaptopropionic acid were added. The mixture was stirred and reacted. After the reaction, the mixture was purified to obtain a quaternary ammonium salt ionic polymer.
[0020] By adopting the above technical solution, the quaternary ammonium salt ion polymer prepared by the above method has stable performance and excellent compatibility. It can more fully synergize with other components of the coating to play a surface energy regulation role and steadily improve the ink flow smoothness.
[0021] Preferably, the mass ratio of glycidyl methacrylate, methacryloyl ethyl sulfobetaine and 3-mercaptopropionic acid is (0.1-0.16):1:0.02.
[0022] By adopting the above technical solution, the mass ratio of glycidyl methacrylate, methacryloyl ethyl sulfobetaine and 3-mercaptopropionic acid is preferably within the above range to achieve system balance, making the structure and properties of the quaternary ammonium salt ion polymer more stable, and continuously synergistically reducing ink flow resistance and improving the stability of ink smoothness by working with other coating components.
[0023] Secondly, this application provides a novel processing technology for a screen printing structure with multiple linewidths and multiple openings, employing the following technical solution: A novel processing technology for a screen printing structure with multiple linewidths and multiple openings includes the following steps: The ink reservoir layer, substrate structure layer and opening layer are stacked from top to bottom and connected and shaped. After shaping, a composite screen is obtained. The composite screen is left to stand and shape, and a screen body is obtained. Multifunctional coating is applied to the surface of the screen body. After drying, a multifunctional coating is formed on the surface of the screen body, and finally a new type of screen structure with multiple line widths and multiple openings is obtained.
[0024] In summary, this application includes at least one of the following beneficial technical effects: The porous polymer substrate provides a low-adhesion and high-strength skeleton, the quaternary ammonium salt ion polymer finely regulates and reduces surface energy, and the organic modified filler improves surface smoothness and wear resistance. The three work together to reduce ink flow resistance and residue, and improve the smoothness and uniformity of ink application in printing. A stable synergistic interface is formed between the coating and the screen substrate through chemical bonding and physical interaction, achieving an organic combination of functions such as hydrophobic conduction, structural enhancement, and interface strengthening, thereby improving the issues of smooth ink flow and structural durability. Detailed Implementation
[0025] The present application will be further described in detail below with reference to the embodiments: Raw material description: All raw materials in the examples are commercially available; the leveling agent is BYK-333, the dispersant is BYK-2050, and the ink reservoir layer can be made of nickel sheet, 304 stainless steel, polyimide, etc., with nickel sheet being preferred in this application; the substrate structure layer can be made of mesh, nickel sheet, or 304 stainless steel, and the opening layer is made of polyimide and steel sheet. Example 1
[0026] Preparation of porous polymer substrates: 84.27g of polydimethylsiloxane (CAS No.: 9016-00-6) was mixed with 8g of curing agent hydrogen-containing silicone oil (CAS No.: 63148-57-2), and then 46.35g of polymethyl methacrylate (CAS No.: 9011-14-7) was added. The mixture was stirred at 150 rpm for 10 min to obtain a mixture. 19.38g of epoxy resin (CAS No.: 24969-06-0) and 3g of γ-aminopropyltriethoxysilane (CAS No.: 919-30-2) were mixed and then added to the mixture. The mixture was stirred in an oil bath at 50°C for 30 min to obtain a porous polymer substrate.
[0027] Preparation of modified nano-silica: 150g of anhydrous ethanol was mixed with 20g of nano-silica, and then 12g of perfluorodecyltriethoxysilane (CAS No.: 101947-16-4) was added. The mixture was magnetically stirred for 4 hours under sealed conditions. After stirring, the mixture was dried in an oven at 60℃ for 12 hours to obtain modified nano-silica.
[0028] Preparation of mercapto-modified rosin: 9.06 g of rosin (CAS No.: 8050-09-7), 7.74 g of N,N-diisopropylethylamine (CAS No.: 7087-68-5), and 11.55 g of urea tetrafluoroborate (CAS No.: 873798-09-5) were added to 150 g of N,N-dimethylformamide (CAS No.: 68-12-2). The mixture was stirred at 300 rpm for 5 min. Then, 6.81 g of cysteamine (CAS No.: 60-23-1) was added, and the reaction was continued for 24 h. After the reaction, the product was washed alternately and repeatedly with saturated brine 5 times. After drying, the product was separated by chromatographic column chromatography to obtain mercapto-modified rosin.
[0029] Preparation of organic modified fillers: 30g of anhydrous ethanol, 8.45g of dopamine (CAS No.: 51-61-6), 4.5g of benzoyl peroxide (CAS No.: 94-36-0), 7.55g of mercapto-modified rosin, 9.68g of titanium dioxide and 12.77g of modified silica were mixed and ultrasonically mixed at 1500rpm for 30min to obtain the organic modified filler.
[0030] Preparation of quaternary ammonium salt ionic polymers: 75g of methanol was mixed with 25g of deionized water to obtain a methanol solution. 2.68g of glycidyl methacrylate (CAS No.: 106-91-2) and 26.79g of methacryloyl ethyl sulfobetaine (CAS No.: 3637-26-1) were added to 50g of the methanol solution respectively to obtain glycidyl methacrylate solution and methacryloyl ethyl sulfobetaine solution. The glycidyl methacrylate solution and methacryloyl ethyl sulfobetaine solution were mixed, and 0.5g of initiator azoisobutyronitrile (CAS No.: 78-67-1) and 0.53g of 3-mercaptopropionic acid (CAS No.: 107-96-0) were added. After stirring and dissolving, the mixture was placed in a water bath at 60℃ under a nitrogen atmosphere and stirred for 3h. Then, oxygen was introduced and the reaction was stopped by transferring the mixture to an ice-water bath. The resulting precipitate was purified with methanol and dried at 60℃ for 12h to obtain a quaternary ammonium salt ion polymer.
[0031] Preparation of multifunctional coatings: Mix 90g of porous polymer substrate, 10g of quaternary ammonium salt ion polymer, 14g of organic modified filler, 2g of dispersant and 1g of leveling agent, and stir for 20min to obtain a multifunctional coating.
[0032] Fabrication of novel screen printing structures with multiple linewidths and multiple openings: The ink reservoir layer, substrate structure layer, and opening layer are stacked from top to bottom. The composite screen is hot-pressed at 75°C and 0.7MPa for 25 minutes to obtain a composite screen. The composite screen is then placed in a constant temperature oven at 55°C for 3 hours to complete the structural shaping. After shaping, the screen body is obtained. A multifunctional coating is evenly applied to the surface of the screen body and dried at 45°C for 3 hours to form a uniform multifunctional coating on the surface of the screen body, resulting in a novel screen structure with multiple linewidths and multiple openings. Example 2
[0033] Preparation of porous polymer substrates: 79.79g of polydimethylsiloxane was mixed with 8g of curing agent hydrogen-containing silicone oil, and then 51.86g of polymethyl methacrylate was added. The mixture was stirred at 150rpm for 10min to obtain a mixture. 18.35g of epoxy resin was mixed with 3g of γ-aminopropyltriethoxysilane and then added to the mixture. The mixture was stirred in an oil bath at 50℃ for 30min to obtain a porous polymer substrate.
[0034] Preparation of modified nano-silica: 150g of anhydrous ethanol was mixed with 20g of nano-silica, and then 12g of perfluorodecyltriethoxysilane was added. The mixture was magnetically stirred for 4 hours under sealed conditions. After stirring, the mixture was dried in an oven at 60℃ for 12 hours to obtain modified nano-silica.
[0035] Preparation of mercapto-modified rosin: 9.06 g of rosin, 7.74 g of N,N-diisopropylethylamine, and 11.55 g of urea tetrafluoroborate were added to 150 g of N,N-dimethylformamide and stirred at 300 rpm for 5 min. Then, 6.81 g of cysteine was added, and the reaction was continued for 24 h. After the reaction, the product was washed repeatedly with saturated brine five times. After drying, the product was separated by chromatographic column chromatography to obtain mercapto-modified rosin.
[0036] Preparation of organic modified fillers: 30g of anhydrous ethanol, 8.45g of dopamine, 4.5g of benzoyl peroxide, 8.25g of mercapto-modified rosin, 9.38g of titanium dioxide and 12.37g of modified silica were mixed and ultrasonically mixed at 1500rpm for 30min to obtain the organic modified filler.
[0037] Preparation of quaternary ammonium salt ionic polymers: 75g of methanol and 25g of deionized water were mixed to obtain a methanol solution. 4.07g of glycidyl methacrylate and 25.42g of methacryloyl ethyl sulfobetaine were added to 50g of the methanol solution to obtain glycidyl methacrylate solution and methacryloyl ethyl sulfobetaine solution, respectively. The glycidyl methacrylate solution and methacryloyl ethyl sulfobetaine solution were mixed, and 0.5g of initiator azoisobutyronitrile and 0.51g of 3-mercaptopropionic acid were added. After stirring and dissolving, the mixture was placed in a water bath at 60℃ under a nitrogen atmosphere and stirred for 3h. Then, oxygen was introduced and the reaction was stopped by transferring the mixture to an ice-water bath. The resulting precipitate was purified with methanol and dried at 60℃ for 12h to obtain a quaternary ammonium salt ion polymer.
[0038] Preparation of multifunctional coatings: Mix 110g of porous polymer substrate, 12g of quaternary ammonium salt ionomer, 18g of organic modified filler, 4g of dispersant and 3g of leveling agent, and stir for 20min to obtain a multifunctional coating.
[0039] Fabrication of novel screen printing structures with multiple linewidths and multiple openings: The ink reservoir layer, substrate structure layer, and opening layer are stacked from top to bottom. The composite screen is hot-pressed at 75°C and 0.7MPa for 25 minutes to obtain a composite screen. The composite screen is then placed in a constant temperature oven at 55°C for 3 hours to complete the structural shaping. After shaping, the screen body is obtained. A multifunctional coating is evenly applied to the surface of the screen body and dried at 45°C for 3 hours to form a uniform multifunctional coating on the surface of the screen body, resulting in a novel screen structure with multiple linewidths and multiple openings. Example 3
[0040] Preparation of porous polymer substrates: Mix 81.97g of polydimethylsiloxane with 8g of curing agent hydrogen-containing silicone oil, then add 49.18g of polymethyl methacrylate, and stir at 150rpm for 10min to obtain a mixture. Mix 18.85g of epoxy resin with 3g of γ-aminopropyltriethoxysilane, and then add it to the mixture. Stir in an oil bath at 50℃ for 30min to obtain a porous polymer substrate.
[0041] Preparation of modified nano-silica: 150g of anhydrous ethanol was mixed with 20g of nano-silica, and then 12g of perfluorodecyltriethoxysilane was added. The mixture was magnetically stirred for 4 hours under sealed conditions. After stirring, the mixture was dried in an oven at 60℃ for 12 hours to obtain modified nano-silica.
[0042] Preparation of mercapto-modified rosin: 9.06 g of rosin, 7.74 g of N,N-diisopropylethylamine, and 11.55 g of urea tetrafluoroborate were added to 150 g of N,N-dimethylformamide and stirred at 300 rpm for 5 min. Then, 6.81 g of cysteine was added, and the reaction was continued for 24 h. After the reaction, the product was washed repeatedly with saturated brine five times. After drying, the product was separated by chromatographic column chromatography to obtain mercapto-modified rosin.
[0043] Preparation of organic modified fillers: 30g of anhydrous ethanol, 8.45g of dopamine, 4.5g of benzoyl peroxide, 7.9g of mercapto-modified rosin, 9.52g of titanium dioxide and 12.58g of modified silica were mixed and ultrasonically mixed at 1500rpm for 30min to obtain organic modified filler.
[0044] Preparation of quaternary ammonium salt ionic polymers: 75g of methanol and 25g of deionized water were mixed to obtain a methanol solution. 3.39g of glycidyl methacrylate and 26.09g of methacryloyl ethyl sulfobetaine were added to 50g of the methanol solution to obtain glycidyl methacrylate solution and methacryloyl ethyl sulfobetaine solution, respectively. The glycidyl methacrylate solution and methacryloyl ethyl sulfobetaine solution were mixed, and 0.5g of initiator azoisobutyronitrile and 0.52g of 3-mercaptopropionic acid were added. After stirring and dissolving, the mixture was placed in a water bath at 60℃ under a nitrogen atmosphere and stirred for 3h. Then, oxygen was introduced and the reaction was stopped by transferring the mixture to an ice-water bath. The resulting precipitate was purified with methanol and dried at 60℃ for 12h to obtain a quaternary ammonium salt ion polymer.
[0045] Preparation of multifunctional coatings: Mix 100g of porous polymer substrate, 11g of quaternary ammonium salt ionomer, 16g of organic modified filler, 3g of dispersant and 2g of leveling agent, and stir for 20min to obtain a multifunctional coating.
[0046] Fabrication of novel screen printing structures with multiple linewidths and multiple openings: The ink reservoir layer, substrate structure layer, and opening layer are stacked from top to bottom. The composite screen is hot-pressed at 75°C and 0.7MPa for 25 minutes to obtain a composite screen. The composite screen is then placed in a constant temperature oven at 55°C for 3 hours to complete the structural shaping. After shaping, the screen body is obtained. A multifunctional coating is evenly applied to the surface of the screen body and dried at 45°C for 3 hours to form a uniform multifunctional coating on the surface of the screen body, resulting in a novel screen structure with multiple linewidths and multiple openings. Example 4
[0047] Example 4 is based on Example 3. In Example 4, when preparing the porous polymer substrate, the amount of polydimethylsiloxane used was 92.02g, polymethyl methacrylate was 36.81g, and epoxy resin was 21.17g. Example 5
[0048] Example 5 is based on Example 3. In Example 5, when preparing the porous polymer substrate, the amount of polydimethylsiloxane used was 73.89g, polymethyl methacrylate was 59.11g, and epoxy resin was 17g. Example 6
[0049] Example 6 is based on Example 3, except that γ-aminopropyltriethoxysilane was not added when preparing the porous polymer substrate in Example 6. Example 7
[0050] Example 7 is based on Example 3. In Example 7, when preparing the organic modified filler, 6.57g of mercapto-modified rosin, 10.1g of titanium dioxide, and 13.33g of modified silica were used. Example 8
[0051] Example 8 is based on Example 3. In Example 8, when preparing the organic modified filler, 9.04g of mercapto-modified rosin, 9.04g of titanium dioxide, and 11.92g of modified silica were used. Example 9
[0052] Example 9 is based on Example 3. In Example 9, when preparing the organic modified filler, the modified silica was replaced with an equal amount of unmodified nano silica. Example 10
[0053] Example 10 is based on Example 3. In Example 10, when preparing the organic modified filler, the mercapto-modified rosin was replaced with an equal amount of unmodified rosin. Example 11
[0054] Example 11 is based on Example 3. In Example 11, no dopamine was added when preparing the organic modified filler. Example 12
[0055] Example 12 is based on Example 3. In Example 12, when preparing the quaternary ammonium salt ion polymer, 1.4 g of glycidyl methacrylate, 28.04 g of methacryloyl ethyl sulfobetaine, and 0.56 g of 3-mercaptopropionic acid were used. Example 13
[0056] Example 13 is based on Example 3. In Example 13, when preparing the quaternary ammonium salt ion polymer, 5.91 g of glycidyl methacrylate, 23.62 g of methacryloyl ethyl sulfobetaine, and 0.47 g of 3-mercaptopropionic acid were used.
[0057] Comparative Example 1 Comparative Example 1 is based on Example 3, but no epoxy resin was added when preparing the porous polymer substrate in Comparative Example 1.
[0058] Comparative Example 2 Comparative Example 2 is based on Example 3, except that the organic modified filler is replaced with an equal amount of modified silica.
[0059] Comparative Example 3 Comparative Example 3 is based on Example 3, except that the organic modified filler is replaced with an equal amount of titanium dioxide.
[0060] Comparative Example 4 Comparative Example 4 is based on Example 3, except that the organic modified filler is replaced with an equal amount of mercapto-modified rosin.
[0061] Performance testing The following performance tests were performed on the samples of Examples 1-13 and Comparative Examples 1-4: (1) Smoothness of ink application Using GB / T 18724-2008 as the testing reference, the ink flow smoothness of the samples was tested, and the ink transfer rate was calculated. Ink transfer rate = (weight gain of substrate after transfer / theoretical ink supply) × 100%. The higher the transfer rate, the smoother the ink flow and the less residue. Each sample was tested 3 times, and the average value was taken. The test results were recorded in Table 1.
[0062] (2) Impact resistance Using GB / T 1732-2020 as the testing reference, the impact strength of the samples was tested. Each sample was tested 3 times, and the average value was taken. The test results were recorded in Table 1.
[0063] (3) Peel strength Using GB / T 2792-2014 as the testing reference, a 90° peel strength test was conducted on the samples. Each sample was tested three times, and the average value was taken. The test results were then recorded in Table 1.
[0064] Table 1 Performance test results of Examples 1-13 and Comparative Examples 1-4
[0065] As shown in Table 1, the ink flow rate of Examples 1-3 is above 95%, the impact resistance is above 4.3J, and the peel strength is above 8.7N, indicating that the screen structure prepared in this application has good ink flow rate, impact resistance and peel strength.
[0066] In Examples 4 and 5, the mass ratios of polydimethylsiloxane, polymethyl methacrylate, and epoxy resin were not within the range specified in this application when preparing the porous polymers. When polymethyl methacrylate was insufficient, it was difficult to achieve a good balance with polydimethylsiloxane, resulting in insufficient strength of the substrate structure, micropore deformation, and difficulty in forming a synergistic bond with epoxy resin. When polymethyl methacrylate was excessive, it weakened the hydrophobic properties of polydimethylsiloxane, resulting in excessive adhesion between the ink and the coating, and difficulty in further synergistically improving the bonding performance with epoxy resin, leading to a decrease in the stability of the coating.
[0067] In Example 6, γ-aminopropyltriethoxysilane was not added when preparing the porous polymer substrate. As a result, it was difficult to bind with the hydroxyl groups on the surface of the screen substrate. The chemical bond was lost, and the substrate relied solely on physical adsorption. The bonding force was weak, and the coating was easy to peel off, which affected the overall stability of the coating.
[0068] In Examples 7 and 8, the mass ratios of mercapto-modified rosin, titanium dioxide, and modified silica during the preparation of the organic modified filler were not within the range specified in this application. When mercapto-modified rosin was insufficient, the binding performance of mercapto groups with the active groups of the porous substrate decreased, the dispersibility and interfacial bonding between titanium dioxide and modified silica in the filler decreased, and titanium dioxide and modified silica agglomerated, resulting in decreased stability. When mercapto-modified rosin was excessive, it covered the spark points of titanium dioxide and modified silica, forming an irregular rosin-rich layer on the coating surface, increasing the flow resistance of the ink, and decreasing the stability of the coating.
[0069] In Example 9, when preparing the organic modified filler, the modified silica was replaced with unmodified ordinary silica. Ordinary silica has abundant hydroxyl groups on its surface, poor compatibility, and agglomerates in the system, affecting the overall stability of the coating.
[0070] In Example 10, when preparing the organic modified filler, the mercapto-modified rosin was replaced with unmodified rosin, which was difficult to form an effective bond with the substrate, resulting in severe agglomeration of the organic modified filler and poor bonding force with the coating substrate.
[0071] In Example 11, no dopamine was added during the preparation of the organic modified filler, making it difficult to form hydrogen bonds and covalent bonds with the web version. As a result, the bonding force between the organic modified filler and the coating decreased significantly, and the stability of the coating decreased.
[0072] In Examples 12 and 13, the mass ratios of glycidyl methacrylate, methacryloyl ethyl sulfobetaine, and 3-mercaptopropionic acid during the preparation of the quaternary ammonium salt ionomer were not within the range specified in this application. When the content of glycidyl methacrylate was insufficient, there were not enough epoxy groups available for reaction on the polymer chain, resulting in insufficient chemical crosslinking density between the polymer and the porous substrate and filler, and a decrease in the stability of the coating. When the amount of glycidyl methacrylate was excessive, the excessive crosslinking affected the toughness of the coating and decreased its stability.
[0073] In Comparative Example 1, no epoxy resin was added when preparing the porous polymer substrate. The absence of epoxy resin significantly reduced the crosslinking density of the substrate, resulting in poor pore structure stability, decreased coating stability, and reduced bonding performance with the screen substrate.
[0074] In Comparative Example 2, the organic modified filler was replaced with modified silica. Modified nano silica could not meet the requirements of filling, leveling and compatibility at the same time. In addition, a large amount of inorganic filler agglomerated in the system, lacking the compatibility effect of mercapto-modified rosin. The filler had poor bonding force with the porous substrate and poor stability.
[0075] In Comparative Example 3, the organic modified filler was replaced with an equal amount of titanium dioxide. The surface of single titanium dioxide is rich in hydroxyl groups, which has poor compatibility with the substrate, causing agglomeration in the system and a decrease in stability.
[0076] In Comparative Example 4, the organic modified filler was replaced with an equal amount of mercapto-modified rosin. The coating prepared by mercapto-modified rosin alone lacked rigid support, had poor surface smoothness, and its adhesion to the screen largely depended on the adhesiveness of the rosin, making it easy to fall off and reducing stability.
[0077] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.
Claims
1. A novel screen structure with multiple line widths and multiple openings, characterized in that: The screen printing plate includes a screen printing body and a multifunctional coating. The screen printing body comprises an ink reservoir layer, a substrate structure layer, and an opening layer arranged sequentially. The multifunctional coating is formed by applying a multifunctional coating material to the surface of the screen printing body. The multifunctional coating material comprises the following components in parts by weight: 90-110 parts of porous polymer substrate, 10-12 parts of quaternary ammonium salt ion polymer, 14-18 parts of organic modified filler, 2-4 parts of dispersant, and 1-3 parts of leveling agent; The raw materials for preparing the porous polymer substrate include polydimethylsiloxane, polymethyl methacrylate, epoxy resin, and γ-aminopropyltriethoxysilane.
2. The novel multi-linewidth, multi-aperture screen structure according to claim 1, characterized in that: The porous polymer substrate was prepared using the following method: Polydimethylsiloxane was mixed with a curing agent, and then polymethyl methacrylate was added. After stirring, the mixture was obtained. Epoxy resin and γ-aminopropyltriethoxysilane were then mixed with the mixture, and the mixture was heated and stirred to obtain a porous polymer substrate.
3. The novel multi-linewidth, multi-aperture screen structure according to claim 2, characterized in that: The mass ratio of polydimethylsiloxane, polymethyl methacrylate and epoxy resin is 1:(0.55-0.65):0.
23.
4. The novel multi-linewidth, multi-aperture screen structure according to claim 1, characterized in that: The organic modified filler includes titanium dioxide, modified nano-silica, and mercapto-modified rosin.
5. A novel multi-linewidth, multi-aperture screen structure according to claim 4, characterized in that: The organic modified filler was prepared by the following method: Rosin, N,N-diisopropylethylamine, and urea tetrafluoroborate were added to N,N-dimethylformamide, stirred, and then cysteamine was added. The reaction was continued with stirring. After the reaction, the mixture was washed to obtain mercapto-modified rosin. Anhydrous ethanol, dopamine, benzoyl peroxide, mercapto-modified rosin, titanium dioxide, and modified silica were mixed and ultrasonically treated to obtain an organic modified filler.
6. A novel multi-linewidth, multi-aperture screen structure according to claim 5, characterized in that: The mass ratio of the mercapto-modified rosin, titanium dioxide and modified silica is (0.78-0.88):1:1.
32.
7. A novel multi-linewidth, multi-aperture screen structure according to claim 1, characterized in that: The raw materials for preparing the quaternary ammonium salt ion polymer include glycidyl methacrylate and methacryloyl ethyl sulfobetaine.
8. A novel multi-linewidth, multi-aperture screen structure according to claim 7, characterized in that: The quaternary ammonium salt ion polymer was prepared by the following method: Glycidyl methacrylate and methacryloyl ethyl sulfobetaine were mixed with ethanol and water, respectively, to obtain solutions of glycidyl methacrylate and methacryloyl ethyl sulfobetaine. The solutions of glycidyl methacrylate and methacryloyl ethyl sulfobetaine were then mixed, and an initiator and 3-mercaptopropionic acid were added. The mixture was stirred and reacted. After the reaction, the mixture was purified to obtain a quaternary ammonium salt ionic polymer.
9. A novel multi-linewidth, multi-aperture screen structure according to claim 8, characterized in that: The mass ratio of glycidyl methacrylate, methacryloyl ethyl sulfobetaine, and 3-mercaptopropionic acid is (0.1-0.16):1:0.
02.
10. A processing technology for a novel multi-linewidth, multi-aperture screen structure as described in any one of claims 1-9, characterized in that: Includes the following steps: The ink reservoir layer, substrate structure layer and opening layer are stacked from top to bottom and connected and shaped. After shaping, a composite screen is obtained. The composite screen is left to stand and shape, and a screen body is obtained. Multifunctional coating is applied to the surface of the screen body. After drying, a multifunctional coating is formed on the surface of the screen body, and finally a new type of screen structure with multiple line widths and multiple openings is obtained.