Method for silk-screening characters on a silicone panel

Abstract

The embodiment of the present application discloses a character silk printing method of silica gel panel, comprising the following steps: step 1, spraying a layer of composite white paint on the surface of the silica gel panel and curing in an IR furnace; step 2, spraying a layer of composite white paint again and curing in an IR furnace; step 3, spraying a layer of composite colored paint and curing in an IR furnace; step 4, spraying a layer of composite touch ink and curing in an IR furnace; step 5, laser engraving corresponding character grooves; step 6, silk printing a layer of colored ink in the character grooves and curing in an IR furnace; and step 7, spraying a layer of composite touch ink on the surface of the silica gel panel after cooling and curing in an IR furnace. The present application improves the wear resistance and alcohol resistance of the silica gel panel coating, avoids phenomena such as discoloration and paint peeling in the later use process, and improves the production yield and product mass productivity.

Description

Technical Field

[0001] This invention relates to the field of silicone panel manufacturing technology, and more particularly to a method for screen printing characters on silicone panels. Background Technology

[0002] As people's aesthetic standards for products improve, product colors have become more diverse, with vibrant colors entering the silicone panel market to attract a wider consumer base. However, in existing silicone panels (such as those for generators), frequent user contact can lead to issues like fading and paint peeling, causing color deviations and affecting the panel's appearance.

[0003] In the silicone industry, many companies currently face challenges with high yield rates for vibrant spray-painted colors, resulting in excessive waste and high costs. This hinders mass production and ultimately limits market penetration. Therefore, there is an urgent need to optimize production processes to improve yield and mass production capabilities, enhance the abrasion and alcohol resistance of silicone panel coatings, and prevent issues such as color fading and paint peeling during later use. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a method for screen printing characters on a silicone panel to improve the wear resistance and alcohol resistance of the silicone panel coating.

[0005] To address the aforementioned technical problems, this invention provides a method for screen printing characters on a silicone panel, comprising:

[0006] Step 1: Spray a layer of composite white paint onto the surface of the silicone panel and cure it in an IR oven;

[0007] Step 2: After cooling, spray another layer of composite white paint onto the surface of the silicone panel and cure it in an IR oven;

[0008] Step 3: After cooling, spray a layer of composite colored paint onto the surface of the silicone panel and cure it in an IR oven;

[0009] Step 4: After cooling, spray a layer of composite tactile ink onto the surface of the silicone panel and cure it in an IR oven;

[0010] Step 5: Laser engrave the corresponding character grooves on the surface of the silicone panel;

[0011] Step 6: Screen print a layer of colored ink into the character grooves on the surface of the silicone panel, and cure it in an IR oven;

[0012] Step 7: After cooling, spray a layer of composite tactile ink onto the surface of the silicone panel, cure it in an IR oven, and cool it to obtain the finished screen-printed silicone panel product.

[0013] Furthermore, the composite white paint sprayed in steps 1 and 2 is composed of white paint, thinner, and platinum solution. The mass ratio of white paint, thinner, and platinum solution is 13.05:52.2:0.3915. The white paint includes the following components by mass: 72 parts of organosilicon resin, 11 parts of titanium dioxide, 3 parts of hydrogen-containing silicone oil, and 14 parts of ethyl acetate.

[0014] Furthermore, the thickness of the composite white paint sprayed in steps 1 and 2 ranges from 25 to 30 μm, the oven temperature is 190°±20°, and the baking curing time ranges from 522±145 s.

[0015] Furthermore, the composite colored paint sprayed in step 3 is composed of colored paint, thinner, and platinum solution. The mass ratio of colored paint, thinner, and platinum solution is 6.25:21.875:0.1875. The colored paint includes the following components by mass: 42 parts of organosilicon resin, 22 parts of colored pigment, 0.1 parts of hydrogen-containing silicone oil, and 35.9 parts of ethyl acetate.

[0016] Furthermore, in step 3, the thickness of the composite colored paint sprayed ranges from 25 to 31 μm, the oven temperature is 190°±20°, and the baking curing time ranges from 522±145 s.

[0017] Furthermore, the composite tactile ink in steps 4 and 7 is composed of tactile oil, diluent, and platinum solution. The mass ratio of tactile oil, diluent, and platinum solution is 3.96:15.84:0.1188. The tactile oil includes the following components by mass: 43 parts of silicone resin, 26 parts of matting agent, 4 parts of hydrogen-containing silicone oil, and 27 parts of ethyl acetate.

[0018] Furthermore, in steps 4 and 7, the thickness of the composite tactile ink sprayed in step 3 ranges from 6 to 8 μm, the oven temperature is 160°±20°, and the baking curing time ranges from 522±145 s.

[0019] The beneficial effects of this invention are as follows: This invention improves the wear resistance and alcohol resistance of the silicone panel coating, avoiding color fading and paint peeling during later use; This invention improves production yield and product mass production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a silicone panel product with completed screen printing according to an embodiment of the present invention. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please refer to Figure 1 The character silkscreening method for the silicone panel in this embodiment of the invention includes steps 1 to 7.

[0023] Step 1: Spray a layer of composite white paint onto the surface of the silicone panel and cure it in an IR oven.

[0024] Step 2: After cooling, spray another layer of composite white paint onto the silicone panel surface and cure it in an IR oven. The composite white paint consists of white paint, thinner, and platinum solution, with a mass ratio of 13.05:52.2:0.3915. The white paint includes the following components by mass: 72 parts silicone resin, 11 parts titanium dioxide, 3 parts hydrogen-containing silicone oil, and 14 parts ethyl acetate. The thickness of the composite white paint ranges from 25 to 30 μm. The oven temperature is 190°±20°C, the baking and curing time ranges from 522±145 s, and the speed is 9±2 Hz (the speed of one revolution of the conveyor belt in the screen printing tunnel oven).

[0025] This invention involves spraying two layers of composite white paint, which improves the adhesion of the composite colored paint; the two layers of white primer also make the color difference value of the spraying more stable.

[0026] Step 3: After cooling, spray a layer of composite colored paint onto the silicone panel surface and cure it in an IR oven. The composite colored paint consists of colored paint, thinner, and platinum solution, with a mass ratio of 6.25:21.875:0.1875. The colored paint comprises the following components by mass: 42 parts silicone resin, 22 parts colored pigment, 0.1 parts hydrogen-containing silicone oil, and 35.9 parts ethyl acetate. The composite colored paint thickness ranges from 25-31 μm. The oven temperature is 190°±20°C, the baking curing time ranges from 522±145 s, and the speed is 9±2 Hz. For the colored pigment, select a commercially available pigment of the corresponding color as needed; for example, if orange is required, choose orange pigment.

[0027] Step 4: After cooling, spray a layer of composite tactile ink onto the surface of the silicone panel and cure it in an IR oven.

[0028] Step 5: Laser engrave the corresponding character grooves on the surface of the silicone panel. Preferably, the laser engraving depth = the thickness of the composite colored paint layer + the thickness of the first composite tactile ink layer.

[0029] Step 6: Screen print a layer of colored ink into the character grooves on the surface of the silicone panel, and then cure it in an IR oven. Existing technology can be used for screen printing, and existing general-purpose colored inks can be used. The curing temperature can also be any existing temperature (220°±10°; IR speed 23±5Hz). In practice, it is preferable to add platinum solution by mass ratio to improve the adhesion of the colored ink; the mass ratio of colored ink to platinum solution is 100:3.

[0030] Step 7: After cooling, spray a layer of composite tactile ink onto the surface of the silicone panel, cure it in an IR oven, and cool it to obtain the finished screen-printed silicone panel product.

[0031] The diluent of the present invention comprises, by weight percentage, 30%~50% 2-methylpentane, 20%~40% 3-methylpentane, 10%~20% 2,2-dimethylbutane, and 10%~20% 2,3-dimethylbutane. The platinum water of the present invention comprises, by weight percentage, 95%~99% terminal vinyl polydimethylsiloxane and 1%~5% platinum(O)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex.

[0032] The composite tactile ink is composed of tactile oil, thinner, and platinum solution, with a mass ratio of 3.96:15.84:0.1188. The tactile oil, by mass, comprises the following components: 43 parts silicone resin, 26 parts matting agent, 4 parts hydrogen-containing silicone oil, and 27 parts ethyl acetate. The composite tactile ink has a thickness range of 6-8 μm, a baking temperature of 160°±20°C, a baking curing time range of 522±145 s, and a speed of 9±2 Hz.

[0033] Composite tactile ink is used to protect the composite colored paint layer and the colored ink layer within the character grooves. This invention uses a single layer of composite tactile ink to protect the screen-printed characters within the character grooves, improving abrasion resistance and alcohol resistance. For the non-character groove areas on the silicone panel (which are more likely to come into contact with the user's hands and be subject to friction), a double layer of composite tactile ink is used for protection (the non-character groove areas, from bottom to top, consist of composite white paint layer 1, composite white paint layer 2, composite colored paint layer, composite tactile ink layer 1, and composite tactile ink layer 2; the character grooves, from bottom to top, consist of a colored ink layer and composite tactile ink layer 2). This also makes it easier to control the gloss of the silicone panel surface, improving abrasion resistance, scratch resistance, and alcohol resistance.

[0034] This invention ensures that the color difference value of each brightly colored ink does not change after repeated wiping and cleaning during the production process. It also improves the efficiency of laser engraving cleaning and wiping, reduces the uncontrollability of color, and makes the color difference value of spraying more stable. The overall production yield and efficiency are improved by more than 30%, and the yield is improved by more than 20%.

[0035] Even after repeated wiping and cleaning, the color difference value of the product of this invention will not change. This invention also improves the efficiency of laser engraving cleaning and wiping, stabilizes the color difference value of the spray coating, and performs well in product performance tests.

[0036] Example 1: First, a first layer of composite white paint was sprayed onto the surface of the silicone panel and cured. Then, a second layer of composite white paint was sprayed and cured (the mass ratio of white paint, thinner, and platinum solution in the composite white paint was 13.05:52.2:0.3915; the thickness of the composite white paint was 28μm; the oven temperature for both layers was 190°C; and the baking curing time was 522s). Next, a layer of composite colored paint was sprayed (the mass ratio of colored paint, thinner, and platinum solution in the composite colored paint was 6.25:21.875:0.1875; the thickness of the composite colored paint was 28μm) and cured (the oven temperature for both layers was 190°C; and the baking curing time was 522s). Finally, a layer of composite tactile ink was sprayed (composite tactile ink...). The mass ratio of tactile ink, thinner, and platinum solution in the composite tactile ink is 3.96:15.84:0.1188, and the thickness of the composite tactile ink is 7μm. The ink is then cured (oven temperature 160°C, baking time 522s). Corresponding character grooves are laser-engraved using a laser engraving machine. A layer of colored ink is screen-printed into the character grooves (oven temperature 220°C; IR speed 23Hz). Another layer of composite tactile ink is then sprayed (the mass ratio of tactile ink, thinner, and platinum solution in the composite tactile ink is 3.96:15.84:0.1188, and the thickness of the composite tactile ink is 7μm), and cured (oven temperature 160°C, baking time 522s). This results in a completed screen-printed silicone panel product. The diluent in Example 1 of this invention consists of 40% 2-methylpentane, 30% 3-methylpentane, 15% 2,2-dimethylbutane, and 15% 2,3-dimethylbutane by mass percentage. The platinum water consists of 97% vinyl-terminated polydimethylsiloxane and 3% platinum(O)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex by mass percentage.

[0037] Tests showed that the silicone panel product of this invention exhibited the following abrasion resistance (using an eraser): no shedding after more than 300g / 1000 cycles; alcohol resistance (using an alcohol abrasion tester): no shedding after more than 300g / 1000 cycles; color difference error within 0.5; visual color difference was minimal, indicating good product color consistency.

[0038] Comparative Example 1: First, a layer of composite white paint was sprayed onto the surface of the silicone panel and cured (the mass ratio of white paint, thinner, and platinum solution in the composite white paint was 13.05:52.2:0.3915; the thickness of the composite white paint was 28 μm; the oven temperature was 190°C; and the baking curing time was 522 s). Then, a layer of composite colored paint was sprayed onto the surface (the mass ratio of colored paint, thinner, and platinum solution in the composite colored paint was 6.25:21.875:0.1875; the thickness of the composite colored paint was 28 μm), and cured. (The oven temperature is 190°C and the baking curing time is 522s); the corresponding character grooves are laser-engraved using a laser engraving machine; a layer of colored ink is screen-printed in the character grooves (oven temperature 220°C; IR speed 23HZ); then a layer of composite tactile ink is sprayed on (the mass ratio of tactile oil, thinner, and platinum water in the composite tactile ink is 3.96:15.84:0.1188, and the thickness of the composite tactile ink is 7μm), and cured (oven temperature is 160°C and the baking curing time is 522s), to obtain the completed screen-printed silicone panel product. The diluent of Comparative Example 1 of this invention consists of 40% 2-methylpentane, 30% 3-methylpentane, 15% 2,2-dimethylbutane, and 15% 2,3-dimethylbutane by mass percentage. The platinum water consists of 97% vinyl-terminated polydimethylsiloxane and 3% platinum(O)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex by mass percentage.

[0039] Post-production testing showed the following results: abrasion resistance (eraser): 300g / 800 cycles; alcohol resistance (alcohol abrasion tester): 300g / 760 cycles; color difference error was above 1.0, and visual inspection revealed obvious color differences in each silicone panel product.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for screen printing characters on a silicone panel, characterized in that, include: Step 1: Spray a layer of composite white paint onto the surface of the silicone panel and cure it in an IR oven; Step 2: After cooling, spray another layer of composite white paint onto the surface of the silicone panel and cure it in an IR oven; Step 3: After cooling, spray a layer of composite colored paint onto the surface of the silicone panel and cure it in an IR oven; Step 4: After cooling, spray a layer of composite tactile ink onto the surface of the silicone panel and cure it in an IR oven; Step 5: Laser engrave the corresponding character grooves on the surface of the silicone panel; Step 6: Screen print a layer of colored ink into the character grooves on the surface of the silicone panel, and cure it in an IR oven; Step 7: After cooling, spray a layer of composite tactile ink onto the surface of the silicone panel, cure it in an IR oven, and cool it to obtain the finished screen-printed silicone panel product. The composite white paint sprayed in steps 1 and 2 consists of white paint, thinner, and platinum solution. The mass ratio of white paint, thinner, and platinum solution is 13.05:52.2:0.3915. The white paint includes the following components by mass: 72 parts of organosilicon resin, 11 parts of titanium dioxide, 3 parts of hydrogen-containing silicone oil, and 14 parts of ethyl acetate. The composite colored paint sprayed in step 3 consists of colored paint, thinner, and platinum solution. The mass ratio of colored paint, thinner, and platinum solution is 6.25:21.875:0.1875. The colored paint includes the following components by mass: 42 parts of organosilicon resin, 22 parts of colored pigment, 0.1 parts of hydrogen-containing silicone oil, and 35.9 parts of ethyl acetate. The composite tactile ink in steps 4 and 7 is composed of tactile oil, diluent, and platinum water. The mass ratio of tactile oil, diluent, and platinum water is 3.96:15.84:0.1188. The tactile oil includes the following components by mass: 43 parts of silicone resin, 26 parts of matting agent, 4 parts of hydrogen-containing silicone oil, and 27 parts of ethyl acetate. The thickness of the composite white paint sprayed in steps 1 and 2 ranges from 25 to 30 μm, the oven temperature is 190℃±20℃, and the baking curing time ranges from 522±145 s. The thickness of the composite tactile ink sprayed in steps 4 and 7 ranges from 6 to 8 μm, the oven temperature is 160℃±20℃, and the baking curing time ranges from 522±145 s.

2. The character silkscreen printing method for a silicone panel as described in claim 1, characterized in that, In step 3, the thickness of the composite colored paint sprayed ranges from 25 to 31 μm, the oven temperature is 190℃±20℃, and the baking and curing time ranges from 522±145 s.

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