Colored drawing process for high-fall, high-color and high-gloss injection molding panel

Abstract

The invention discloses a high-fall, high-color and high-gloss injection molding panel colored drawing process which comprises the following steps: S1, selecting printing ink with a corresponding color, and putting the printing ink into each corresponding ink box in a colored drawing machine; s2, the plastic panel is placed on a colored drawing machine, and ink-jet colored drawing is conducted on the plastic panel through a spray head; s3, UV curing is carried out after colored drawing is completed; the ink is prepared from the following components in parts by weight: 10 to 20 parts of inorganic pigment, 5 to 15 parts of ethyoxyl ethyoxyl ethyl acrylate, 35 to 45 parts of 2-phenoxyl ethyl acrylate, 5 to 15 parts of N-vinyl caprolactam and 1 to 10 parts of dipropylene glycol diacrylate. No volatile organic compound is discharged in the ink, and no VOC is generated when the ink is cured, so that the environmental pollution is greatly reduced; the obtained pattern has good adhesive force, alcohol resistance, light resistance and humidity and heat resistance on a plastic part, and has the characteristic of high fall, and the colored pattern has the characteristics of high color, high gloss and high light transmission, and is more diversified in color.

Description

TECHNICAL FIELD

[0001] The application belongs to a painting process, in particular to a high-fall high-color high-gloss injection panel painting process. BACKGROUND

[0002] When the existing plastic parts need to be decorated with different textures or patterns, the plastic panels are usually directly pasted with decorative films, and some are directly painted on the plastic panels. However, the patterns obtained by directly painting on the plastic parts are flat, lack of three-dimensionality, and have insufficient adhesion and alcohol resistance, and the patterns are prone to fall off; when using traditional printing, the VOC components in the ink will continue to volatilize for a long time, causing environmental pollution, having an odor, and having poor light transmittance and being unable to realize the pattern in the window position. SUMMARY

[0003] The purpose of the present application is to provide a high-fall high-color high-gloss injection panel painting process capable of solving at least one of the above problems.

[0004] According to one aspect of the present application, a high-fall high-color high-gloss injection panel painting process is provided, comprising the following steps: S1, selecting ink of a corresponding color and placing it in each corresponding ink cartridge of a painting machine; S2, placing a plastic panel on the painting machine and performing inkjet painting on the plastic panel by the nozzle of the painting machine; S3, performing UV curing after painting is completed; The ink in step S1 includes the following components by weight: 10-20 parts of inorganic pigment, 5-15 parts of ethoxyethoxyethyl acrylate, 35-45 parts of 2-phenoxyethyl acrylate, 5-15 parts of N-vinyl caprolactam, 1-10 parts of dipropylene glycol diacrylate, 1-5 parts of 2-isopropyl thioxanthone, and 1-10 parts of photoinitiator TPO.

[0005] In some embodiments, the painting machine in step S1 uses a UV flatbed inkjet printer, the nozzle is multiple, two ink cartridges are installed at each nozzle, and a controller is provided on the painting machine, and each ink cartridge is electrically connected to the controller.

[0006] In some embodiments, a plurality of nozzles are installed at each nozzle, the number of nozzles on each nozzle is 1280, and the size of the ink droplets sprayed by the nozzles is 5-15 PL.

[0007] In some embodiments, the firing frequency of the nozzle is ≤50 KH.

[0008] In some embodiments, the nozzle can move in the X-axis direction, Y-axis direction and Z-axis direction on the UV flatbed inkjet printer. In some embodiments, the nozzle can move in the X-axis direction, Y-axis direction and Z-axis direction on the UV flatbed inkjet printer.

[0009] In some embodiments, the texture resolution of the printed pattern is 600 dpi in single color and 300 dpi in double color.

[0010] In some embodiments, the side of the nozzle is provided with a UV curing lamp.

[0011] The beneficial effects of the present application are: 1. The ink used in the present application does not emit volatile organic compounds (VOC), and no VOC is generated during the curing process. Compared with the solvent-based ink used in traditional printing process, the present application greatly reduces environmental pollution and avoids the generation of odor. 2. The pattern obtained by the above-mentioned ink painting has good adhesion, alcohol resistance, light resistance and moisture resistance on plastic parts. 3. The painted pattern obtained by the process has a high drop characteristic, i.e. a high-precision pattern with a drop of 0~15mm. The painted pattern has high color and high gloss characteristics, and the color is more diverse. 4. The pattern is directly cured by UV curing lamp after painting, which greatly improves the processing efficiency. 5. The ink drop size can be as small as 5pl, the jetting precision is high, and high-definition printing can be realized at 600 dpi. The firing frequency of the nozzle is as high as 50KH, which can greatly improve the production efficiency. 6. The pattern layer obtained by painting has high light transmission characteristics, and can realize display window pattern. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The effect picture of the painted pattern obtained by the painting process of the present application.

[0014] Figure 2 The pattern effect picture of the existing printing technology.

[0015] Figure 3 The window effect picture of the painted pattern obtained by the painting process of the present application DETAILED DESCRIPTION

[0016] The present application will be further described in detail below with reference to the accompanying drawings. Example 1

[0017] The high-drop high-color high-gloss injection panel painting process of the present application comprises the following steps: S1, selecting ink of corresponding color and placing it in each corresponding ink cartridge of the painting machine; S2, placing the plastic panel on the painting machine and performing inkjet painting on the plastic panel by the nozzle of the painting machine; S3, UV curing after painting is completed; The ink in step S1 includes the following components by weight: Inorganic pigment 15 parts, ethoxyethoxyethyl acrylate 10 parts, 2-phenoxyethyl acrylate 40 parts, N-vinyl caprolactam 10 parts, dipropylene glycol diacrylate 5 parts, 2-isopropyl thioxanthone 3 parts and photoinitiator TPO 5 parts.

[0018] The ethoxyethoxyethyl acrylate is 2-(2-ethoxyethoxy) ethyl acrylate, with a CAS number of 7328-17-8; 2-phenoxyethyl acrylate, with a CAS number of 48145-04-6; N-vinyl caprolactam, with a CAS number of 2235-00-9; Dipropylene glycol diacrylate, with a CAS number of 57472-68-1; 2-isopropyl thioxanthone, with a CAS number of 5495-84-1; Photoinitiator TPO, i.e. diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide, with a CAS number of 75980-60-8.

[0019] The inorganic pigment can be selected according to the color of the pattern to be sprayed, to meet different color requirements of the pattern. The inorganic pigment is selected so that the pigment itself does not contain volatile organic compounds, and other components in the ink also do not contain organic compound VOC components, so that the ink does not emit harmful components such as VOC after being sprayed, greatly reducing environmental pollution and achieving the effect of environmental protection.

[0020] The pattern obtained by color drawing with the above ink has the characteristics of waterproofness, sun protection and scratch resistance after being quickly cured by UV, prolonging the service life of the product and maintaining stable color and performance during long-term use.

[0021] The color drawing machine in step S1 adopts a UV flat plate drawing machine, the spray head is multiple, two ink cartridges are installed at each spray head, a controller is arranged on the color drawing machine, and each ink cartridge is electrically connected with the controller. In actual use, the controller controls the ejection amount of the ink in each ink cartridge, so that different color patterns can be obtained by color drawing. The controller controls the ink ejection amount of each ink cartridge, which is prior art, and the specific control process will not be described here.

[0022] Multiple nozzles are installed at each spray head, the number of nozzles on each spray head is 1280, and the size of the ink droplets sprayed by the nozzles is 5-15 PL. In actual use, 4 spray heads can be selected, and 1280 nozzles are arranged on each spray head, so that the ink droplets are small and delicate.

[0023] In the color drawing, since the size of the ejected ink droplet is as small as 5pl, the jetting precision is high, and single color can realize high-definition printing at 600dpi, and when double colors are used, the resolution can reach 300dpi, so that the pattern obtained by color drawing has high resolution; and the surface of the cured color drawing layer is smooth and has high gloss, and has excellent wear resistance, weather resistance and chemical resistance.

[0024] The nozzle can move in X-axis direction, Y-axis direction and Z-axis direction on the UV flatbed inkjet printer. The movement control mode of the nozzle on the UV flatbed inkjet printer is prior art, which will not be repeated here. Through the X, Y and Z axis movement of the nozzle, the inkjet of different positions of the plastic panel can be realized.

[0025] The ignition frequency of the nozzle can be as high as 50KH, which greatly improves the inkjet efficiency of the nozzle and can greatly improve the production efficiency. A UV curing lamp is arranged on one side of the nozzle, so that when the inkjet color drawing of the nozzle is completed, the color drawing part is directly cured by the UV curing lamp, and the cured ink has no peculiar smell; the curing efficiency is high, and it only takes a few seconds to complete, which greatly shortens the production cycle.

[0026] In actual use, the process can be used for printing on different materials such as metal and ceramic in addition to plastic panels, and the adhesion to metal and ceramic materials is also sufficient, and has good alcohol resistance.

[0027] The color drawing pattern (such as Figure 1 shown) obtained by the high-fall high-color high-gloss injection molding panel color drawing process of the application can realize the effect of high fall, and the pattern fall can be in the range of 0~15mm, and has good three-dimensional effect and high-precision high-resolution pattern; through multiple nozzles and multiple ink cartridges, the color diversity of the color drawing pattern can be realized, and the high-gloss full coverage of the pattern can be realized; the pattern layer obtained by color drawing has high light transmission characteristics, and can realize the display window pattern (such as Figure 3 shown), and the contrast Figure 2 and Figure 3 can be known that Figure 3 the pattern layer obtained by the process of the application has better light transmission effect; at the same time, the adhesion of the ink to the plastic panel is greatly enhanced, the hardness of the color drawing layer is ensured, the pollution to the environment in the printing process is reduced, the environmental protection effect is achieved; and has good weather resistance, moisture resistance and water resistance and other characteristics. The color drawing texture on the plastic panel is tested, and the results are shown in the following table: Property Compliance Performance Pencil hardness ≥ HB According to GB / T 6739-2006 Adhesion (cross-hatch method) Adhesion not more than 1 level According to GB / T 9286 Resistance to alcohol (99.5%) wiping 0.5KG force, 50 times without bottom Cotton + weight Water resistance 48h (export products 120h) No blistering, no shedding, no slight discoloration GB / T 1733 Wet heat resistance 48h (export products 120h) No whitening, blistering, wrinkling, obvious discoloration and paint film softening and other defects GB / T 1740 Weather resistance 48h No obvious chalking phenomenon, no damage, blistering, peeling, wrinkling and other defects. Test according to GB / T 14522, rated according to GB / T 1766 Example 2

[0028] This embodiment is basically the same as example 1, and the performance achieved is also the same as example 1, the difference is that the ink in step S1 includes the following components by weight: Inorganic pigment 10 parts, ethoxyethoxyethyl acrylate 5 parts, 2-phenoxyethyl acrylate 35 parts, N-vinyl caprolactam 5 parts, dipropylene glycol diacrylate 1 part, 2-isopropylthioxanthone 1 part, and photoinitiator TPO 1 part. Example 3

[0029] This example is basically the same as Example 1, and the same performance is achieved as in Example 1, with the difference that the ink in step S1 comprises the following components in parts by weight: Inorganic pigment 20 parts, ethoxyethoxyethyl acrylate 15 parts, 2-phenoxyethyl acrylate 45 parts, N-vinyl caprolactam 15 parts, dipropylene glycol diacrylate 10 parts, 2-isopropylthioxanthone 5 parts, and photoinitiator TPO 0 parts.

[0030] The above is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept, and these are within the scope of the present application.

Claims

1. A high-drop, high-color, high-gloss injection molding panel painting process, characterized in that: Includes the following steps: S1. Select the corresponding color ink and put it into the corresponding ink cartridge in the color printer; S2. Place the plastic panel on the color printer and use the printer's printhead to inkjet paint the plastic panel. S3. After the painting is completed, UV curing is performed; The ink in step S1 comprises the following components in parts by weight: 10-20 parts of inorganic pigment, 5-15 parts of ethoxyethoxyethyl acrylate, 35-45 parts of 2-phenoxyethyl acrylate, 5-15 parts of N-vinylcaprolactam, 1-10 parts of dipropylene glycol diacrylate, 1-5 parts of 2-isopropylthioxanthone, and 1-10 parts of photoinitiator TPO.

2. The high-drop, high-color, high-gloss injection molding panel painting process according to claim 1, characterized in that, The color printer in step S1 is a UV flatbed inkjet printer with multiple printheads. Each printhead has two ink cartridges installed. The color printer is equipped with a controller, and each ink cartridge is electrically connected to the controller.

3. The high-drop, high-color, high-gloss injection molding panel painting process according to claim 2, characterized in that, Each printhead is equipped with multiple nozzles, with a total of 1280 nozzles on each printhead. The ink droplets ejected by the nozzles are 5~15PL in size.

4. The high-drop, high-color, high-gloss injection molding panel painting process according to claim 3, characterized in that, The ignition frequency of the nozzle is ≤50KH.

5. The high-drop, high-color, high-gloss injection molding panel painting process according to any one of claims 2 to 4, characterized in that, The printhead can move along the X-axis, Y-axis and Z-axis on a UV flatbed printer.

6. The high-drop, high-color, high-gloss injection molding panel painting process according to claim 5, characterized in that, The texture resolution after printing by the printhead is 600 dpi in monochrome and 300 dpi in two colors.

7. The high-drop, high-color, high-gloss injection molding panel painting process according to claim 2, characterized in that, A UV curing lamp is provided on one side of the nozzle.

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