Vacuum plating manufacturing process for deep scene on plastic surface

Abstract

According to the plastic surface deep scene vacuum plating manufacturing process, UV primer is sprayed to the back face of a plastic product, and a mirror surface primer layer is formed; the mirror surface primer layer is placed in vacuum electroplating equipment, vacuumizing is conducted till the vacuum degree is 5 * 10 <-3 > Pa or below, 99.99% of high-purity aluminum materials are subjected to vacuum evaporation, and a mirror surface electroplated aluminum layer is obtained; engraving a required pattern on the mirror surface electroplated aluminum layer by adopting laser engraving equipment; spraying UV finish paint on the surface of the carved pattern to form a protective layer; spraying the UV finish paint on the front surface of the plastic product to form a mirror paint layer on the front surface; placing the front mirror surface paint layer in vacuum electroplating equipment, vacuumizing to below 5 * 10 <-3 > Pa, and carrying out vacuum evaporation on 99.99% high-purity indium material or zinc sulfide to obtain a semi-permeable mirror surface electroplated layer; the electroplated layers on the front and back surfaces mutually reflect to form a deep scene (multi-layer scene) effect; the pattern has a three-dimensional and multi-layer visual effect when viewed from the front side, UV gloss oil is sprayed on the surface of the semi-permeable mirror surface electroplated layer, and the formed surface protective layer is excellent in wear resistance; and the attractiveness and durability of the product are obviously enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum electroplating technology, in particular to a process material for producing deep-scene (thousand-layer scene) vacuum electroplating on a plastic surface. Background Art

[0002] Electronic cigarettes have developed rapidly since their introduction and have become an important alternative to traditional cigarettes. The shell of electronic cigarettes is mostly made of plastic, which not only requires a novel and fashionable appearance, but also takes into account the feel, strength and other performance. However, the existing plastic shell decoration technology has many limitations and is difficult to meet the increasing market demand.

[0003] At present, the plastic shell of electronic cigarettes mainly adopts traditional decoration methods such as spraying, water transfer printing, electroplating, and silk screen printing.

[0004] These methods have the following problems:

[0005] 1. Conventional spray coating has a short life and is not durable under repeated friction and heat conditions. The water transfer pattern has low resolution, single color, and the transfer layer is easily scratched, affecting the appearance.

[0006] 2. Traditional electroplating process can easily cause deformation of plastic shell. The waste liquid and waste residue produced by electroplating contain heavy metals, which are not environmentally friendly and highly toxic, and are gradually being replaced.

[0007] 3. The resolution of surface printing patterns such as silk screen printing and pad printing is limited, the color richness is not enough, and the visual effect is not novel enough. The pattern layer has poor wear resistance and is easy to wear out after long-term use, which is worrying about hygiene and safety. In addition, printing is suitable for flat surfaces and it is difficult to present complex three-dimensional patterns.

[0008] 4. It is difficult to achieve multi-level, three-dimensional high-end fashion craftsmanship on the surface of plastic shells using existing methods, which limits the flexibility of appearance design.

[0009] 5. Most products have a high-end visual feel after traditional surface treatment, but the consumer's pursuit of novelty is difficult to achieve.

[0010] In addition to electronic cigarette shells, electronic digital product shells, home appliance panels, and automotive interiors also face the same decoration process challenges. Therefore, it is urgent to develop new surface decoration technologies suitable for plastic products, which should have outstanding appearance, good hand feel, high hardness, wear resistance, and durability, and the best visual effect should be 3D. Summary of the invention

[0011] In view of the above problems, the development of a deep-scene (thousand-layer-scene) vacuum electroplating process for plastic surfaces that can provide various products with novel appearances has important practical significance and urgent needs.

[0012] The deep-view vacuum plating process for plastic surface includes the following steps:

[0013] Spraying a UV primer on the back of the plastic product to form a mirror primer layer; wherein the UV primer comprises the following components: 100-300 parts by weight of acrylate, 100-300 parts by weight of polyurethane acrylate resin, 10-30 parts by weight of polyether silicone, 100-250 parts by weight of isobutyl alcohol, 150-300 parts by weight of isopropyl alcohol, 100-250 parts by weight of butyl acetate, 50-150 parts by weight of ethylene glycol butyl ether, 10-50 parts by weight of 1,6-hexanediol diacrylate and 10-50 parts by weight of a photoinitiator;

[0014] The mirror primer layer is placed in a vacuum plating device and evacuated to 5×10 -3 Below Pa, 99.99% high-purity aluminum is evaporated in vacuum to obtain a mirror-like electroplated aluminum layer;

[0015] Using laser engraving equipment to engrave a desired pattern on the mirror-surface electroplated aluminum layer;

[0016] Spraying UV topcoat on the surface of the engraved pattern to form a protective layer; wherein the UV topcoat comprises the following components: 100-300 parts by weight of acrylate, 100-300 parts by weight of polyurethane acrylate resin, 10-30 parts by weight of polyether silicone, 100-250 parts by weight of isobutyl alcohol, 150-300 parts by weight of isopropyl alcohol, 100-250 parts by weight of butyl acetate, 50-150 parts by weight of ethylene glycol butyl ether, 10-50 parts by weight of 1,6-hexanediol diacrylate, 10-50 parts by weight of photoinitiator and 10-30 parts by weight of trifunctional phosphate acrylate;

[0017] Spray the UV topcoat on the front of the plastic product to form a mirror paint layer on the front; place the mirror paint layer on the front in a vacuum electroplating device, evacuate the vacuum to below 5×10-3Pa, and vacuum evaporate 99.99% high-purity indium material or zinc sulfide to obtain a semi-mirror surface electroplating layer;

[0018] Specifically, the spray thickness of the UV primer is 20-50 microns, and after spraying, it is cured by UV lamp irradiation, and the UV power is ≥1000mJ / cm 2 , the irradiation time is 10-30 seconds.

[0019] Specifically, the evaporation power of the aluminum material in the vacuum electroplating is 25-50KW, the evaporation time is 10-30 seconds, and the thickness of the deposited aluminum layer is 50-200 nanometers.

[0020] Specifically, the laser engraving adopts a laser power of 10-200W, a wavelength of 1064nm, a pulse frequency of 1-20kHz, and a scanning speed of 500-2000mm / s.

[0021] Specifically, the spraying thickness of the UV topcoat is 10-30 microns, and after spraying, it is cured by UV lamp irradiation, and the UV power is ≥500mJ / cm 2 , the irradiation time is 10-30 seconds.

[0022] Specifically, the UV topcoat is sprayed on the front side of the plastic product with a thickness of 20-50 microns. After spraying, it is cured by UV lamp irradiation, the UV power is ≥1000mJ / cm2, and the irradiation time is 30-120 seconds.

[0023] Specifically, the thickness of the indium material or zinc sulfide layer evaporated by the front vacuum is 30-100 nanometers, the evaporation temperature is 400-800° C., and the evaporation time is 5-20 minutes.

[0024] Specifically, the back mirror-surface electroplated aluminum layer and the front translucent electroplated layer form a deep-view stereoscopic pattern effect through mutual reflection.

[0025] Specifically, the UV varnish is transparent or colored UV varnish, the spraying thickness is 10-30 microns, and after spraying, it is cured by UV lamp irradiation, and the UV power is ≥500mJ / cm 2 , the irradiation time is 10-60 seconds.

[0026] In the plastic surface deep-view vacuum electroplating manufacturing process, the weight ratio of acrylate to polyurethane acrylate resin in the UV primer and UV topcoat is 1:1-1:3.

[0027] The back side vacuum plating forms a uniform and fine metal aluminum film on the plastic substrate, with closely arranged grains and extremely high reflectivity, forming an ideal mirror effect. Laser engraving on it can finely etch the pattern outline to form a concave and convex microstructure.

[0028] The front side is vacuum-plated with indium or zinc sulfide to form a translucent layer. These two materials have moderate refractive index and good light transmittance, and zinc sulfide has a large bandgap and high transparency in the visible light range, which is conducive to the transmission of background colors. When light passes through the front translucent layer and hits the concave-convex structure of the back engraving, diffuse reflection occurs, and each reflected light is refracted and reflected on the translucent layer, and finally converges to the human eye to form different visual effects of light and dark, highlighting the layering and depth of the engraved pattern.

[0029] The polyether silicone and trifunctional acrylate in the UV coating form a rigid and flexible structure. The siloxane skeleton is flexible and the acrylate is easily cross-linked and cured. At the same time, the siloxane end groups and the polar groups on the acrylate can form coordination bonds with the metal layer, enhancing the bonding strength between the coating and the substrate, thereby improving adhesion and wear resistance.

[0030] Therefore, the present invention has the following beneficial effects:

[0031] 1. Unique deep-view three-dimensional decorative effect: Through the mirror reflection on the back and the translucent refraction on the front, the flat decoration is given a sense of space, forming a visual multi-level and rich details, with a naked-eye 3D effect.

[0032] 2. High-fidelity color restoration: The translucent layer has little interference with the background color, the decorative pattern is bright and realistic, and at the same time it presents a translucent texture and a full sense of grade.

[0033] 3. High hardness and good feel: The UV coating and the metal layer work together to make the surface hardness reach the metal level, and the feel is delicate, meeting the needs of high-end decoration.

[0034] 4. Simple process and high cost performance: Introducing a translucent layer into the conventional vacuum plating process does not require complex equipment and has a moderate cost, but the decorative effect is greatly improved.

[0035] 5. Wide application: The present invention is not only applicable to electronic cigarette shells, but also to mobile phones, computers, home appliance shells, etc., and has broad market prospects.

[0036] The present invention has achieved a major breakthrough in the surface decoration process of plastic products by introducing a front and back double-layer structure in vacuum plating and using optical principles, achieving a leap-forward improvement in three-dimensional sense, color, hardness, etc. This unique deep-view effect and excellent comprehensive performance will greatly expand the product design space and bring revolutionary changes to the decoration upgrade of plastic products. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] The specific steps of deep-view vacuum plating production process on plastic surface are as follows:

[0040] 1. Spray the UV primer on the back of the plastic product to form a mirror primer layer; wherein the UV primer is composed of: 100 parts by weight of acrylate, 100 parts by weight of polyurethane acrylate resin, 10 parts by weight of polyether silicone, 100 parts by weight of isobutyl alcohol, 150 parts by weight of isopropyl alcohol, 100 parts by weight of butyl acetate, 50 parts by weight of ethylene glycol butyl ether, 10 parts by weight of 1,6-hexanediol diacrylate, and 10 parts by weight of photoinitiator; the spraying thickness is 20 microns, and the UV lamp is used for curing, and the UV power is 1000mJ / cm2 , irradiation time 30 seconds.

[0041] 2. Place the mirror primer layer in a vacuum plating device and evacuate to 5×10 -3 Pa, vacuum evaporate 99.99% high purity aluminum, evaporation temperature 800 ° C, evaporation time 10 minutes, obtain a mirror aluminum layer with a thickness of 50 nanometers.

[0042] 3. Use laser engraving equipment to engrave the required pattern on the mirror aluminum layer; laser power 50W, wavelength 1064nm, pulse frequency 1kHz, scanning speed 500mm / s.

[0043] 4. Spray UV topcoat on the surface of the engraved pattern to form a protective layer; the UV topcoat composition is: 100 parts by weight of acrylate, 100 parts by weight of polyurethane acrylate resin, 10 parts by weight of polyether silicone, 100 parts by weight of isobutyl alcohol, 150 parts by weight of isopropyl alcohol, 100 parts by weight of butyl acetate, 50 parts by weight of ethylene glycol butyl ether, 10 parts by weight of 1,6-hexanediol diacrylate, 10 parts by weight of photoinitiator, and 30 parts by weight of trifunctional phosphate acrylate; the spraying thickness is 10 microns, and the UV lamp is irradiated and cured, and the UV power is 500mJ / cm 2 , irradiation time 10 seconds.

[0044] 5. Spray UV topcoat on the front of the plastic product. The composition is the same as step 4. The spraying thickness is 20 microns. UV lamp irradiation curing, UV power 1000mJ / cm 2 , irradiation time is 30 seconds, forming a front mirror paint layer.

[0045] 6. Place the front mirror paint layer in a vacuum electroplating device, evacuate to 5×10-3Pa, vacuum evaporate 99.99% high-purity indium material, the evaporation temperature is 500°C, the evaporation time is 10 minutes, and obtain a translucent electroplating layer with a thickness of 50 nanometers.

[0046] 7. The mirror aluminum layer on the back and the translucent layer on the front reflect each other to form a three-dimensional deep-view pattern effect.

[0047] 8. Spray transparent UV varnish on the surface of the translucent electroplating layer with a thickness of 10 microns and cure with UV lamp with a UV power of 500mJ / cm 2 , irradiation time 10 seconds, to form a surface protective layer.

[0048] Example 2

[0049] The specific steps of deep-view vacuum plating production process on plastic surface are as follows:

[0050] 1. Spray the UV primer on the back of the plastic product to form a mirror primer layer; wherein the UV primer is composed of: 300 parts by weight of acrylate, 300 parts by weight of polyurethane acrylate resin, 30 parts by weight of polyether silicone, 250 parts by weight of isobutyl alcohol, 300 parts by weight of isopropyl alcohol, 250 parts by weight of butyl acetate, 150 parts by weight of ethylene glycol butyl ether, 50 parts by weight of 1,6-hexanediol diacrylate, and 50 parts by weight of photoinitiator; the spraying thickness is 50 microns, and the UV lamp is used for curing, and the UV power is 3000mJ / cm 2 , irradiation time 120 seconds.

[0051] 2. Place the mirror primer layer in a vacuum plating device and evacuate to 5×10 -3 Pa, vacuum evaporate 99.99% high purity aluminum, evaporation temperature 1200 ° C, evaporation time 30 minutes, to obtain a mirror aluminum layer with a thickness of 200 nanometers.

[0052] 3. Use laser engraving equipment to engrave the required pattern on the mirror aluminum layer; laser power 200W, wavelength 1064nm, pulse frequency 20kHz, scanning speed 2000mm / s.

[0053] 4. Spray UV topcoat on the surface of the engraved pattern to form a protective layer; the UV topcoat composition is: 300 parts by weight of acrylate, 300 parts by weight of polyurethane acrylate resin, 30 parts by weight of polyether silicone, 250 parts by weight of isobutyl alcohol, 300 parts by weight of isopropyl alcohol, 250 parts by weight of butyl acetate, 150 parts by weight of ethylene glycol butyl ether, 50 parts by weight of 1,6-hexanediol diacrylate, 50 parts by weight of photoinitiator, and 10 parts by weight of trifunctional phosphate acrylate; the spraying thickness is 30 microns, and the UV lamp is irradiated and cured, and the UV power is 1000mJ / cm 2 , irradiation time 60 seconds.

[0054] 5. Spray UV topcoat on the front of the plastic product. The composition is the same as step 4. The spraying thickness is 50 microns. UV lamp irradiation curing, UV power 3000mJ / cm 2 , irradiation time 120 seconds, forming a front mirror paint layer.

[0055] 6. Place the front mirror paint layer in a vacuum plating device and evacuate to 5×10 -3 Pa, vacuum evaporate 99.99% zinc sulfide, the evaporation temperature is 600°C, the evaporation time is 15 minutes, and a semi-transparent electroplated layer with a thickness of 80 nanometers is obtained.

[0056] 7. The mirror aluminum layer on the back and the translucent layer on the front reflect each other to form a three-dimensional deep-view pattern effect.

[0057] 8. Spray colored UV varnish on the surface of the translucent electroplating layer with a thickness of 30 microns and cure with UV lamp with a UV power of 1000mJ / cm 2 , irradiation time 60 seconds, to form a surface protective layer.

[0058] Example 3

[0059] The specific steps of deep-view vacuum plating production process on plastic surface are as follows:

[0060] 1. Spray the UV primer on the back of the plastic product to form a mirror primer layer; wherein the UV primer is composed of: 200 parts by weight of acrylate, 200 parts by weight of polyurethane acrylate resin, 20 parts by weight of polyether silicone, 200 parts by weight of isobutyl alcohol, 200 parts by weight of isopropyl alcohol, 200 parts by weight of butyl acetate, 100 parts by weight of ethylene glycol butyl ether, 30 parts by weight of 1,6-hexanediol diacrylate, and 30 parts by weight of photoinitiator; the spraying thickness is 30 microns, and the UV lamp is used for curing, and the UV power is 2000mJ / cm 2 , irradiation time 60 seconds.

[0061] 2. Place the mirror primer layer in a vacuum plating device and evacuate to 5×10 -3 Pa, vacuum evaporate 99.99% high purity aluminum, evaporation temperature 1000 ℃, evaporation time 20 minutes, obtain a mirror aluminum layer with a thickness of 100 nanometers.

[0062] 3. Use laser engraving equipment to engrave the required pattern on the mirror aluminum layer; laser power 100W, wavelength 1064nm, pulse frequency 10kHz, scanning speed 1000mm / s.

[0063] 4. Spray UV topcoat on the surface of the engraved pattern to form a protective layer; the UV topcoat composition is: 200 parts by weight of acrylate, 200 parts by weight of polyurethane acrylate resin, 20 parts by weight of polyether silicone, 200 parts by weight of isobutyl alcohol, 200 parts by weight of isopropyl alcohol, 200 parts by weight of butyl acetate, 100 parts by weight of ethylene glycol butyl ether, 30 parts by weight of 1,6-hexanediol diacrylate, 30 parts by weight of photoinitiator, and 20 parts by weight of trifunctional phosphate acrylate; the spraying thickness is 20 microns, and the UV lamp is irradiated and cured, and the UV power is 800mJ / cm 2 , irradiation time 30 seconds.

[0064] 5. Spray UV topcoat on the front of the plastic product. The composition is the same as step 4, the spraying thickness is 30 microns, and it is cured by UV lamp. The UV power is 2000mJ / cm2 and the irradiation time is 60 seconds to form a front mirror paint layer.

[0065] 6. Place the front mirror paint layer in a vacuum plating device and evacuate to 5×10 -3Pa, vacuum evaporate 99.99% high-purity indium material, evaporation temperature 400°C, evaporation time 5 minutes, obtain a semi-transparent electroplating layer with a thickness of 30 nanometers.

[0066] 7. The mirror aluminum layer on the back and the translucent layer on the front reflect each other to form a three-dimensional deep-view pattern effect.

[0067] 8. Spray transparent UV varnish on the surface of the translucent electroplating layer with a thickness of 20 microns and cure with UV lamp with a UV power of 800mJ / cm 2 , irradiation time 30 seconds, to form a surface protective layer.

[0068] Example 4

[0069] The specific steps of deep-view vacuum plating production process on plastic surface are as follows:

[0070] 1. Spray the UV primer on the back of the plastic product to form a mirror primer layer; wherein the UV primer is composed of: 300 parts by weight of acrylate, 100 parts by weight of polyurethane acrylate resin, 10 parts by weight of polyether silicone, 100 parts by weight of isobutyl alcohol, 300 parts by weight of isopropyl alcohol, 100 parts by weight of butyl acetate, 150 parts by weight of ethylene glycol butyl ether, 50 parts by weight of 1,6-hexanediol diacrylate, and 50 parts by weight of photoinitiator; the spraying thickness is 50 microns, and the UV lamp is used for curing, and the UV power is 3000mJ / cm 2 , irradiation time 120 seconds.

[0071] 2. Place the mirror primer layer in a vacuum plating device and evacuate to 5×10 -3 Pa, vacuum evaporate 99.99% high purity aluminum, evaporation temperature 1200 ° C, evaporation time 30 minutes, to obtain a mirror aluminum layer with a thickness of 200 nanometers.

[0072] 3. Use laser engraving equipment to engrave the required pattern on the mirror aluminum layer; laser power 200W, wavelength 1064nm, pulse frequency 20kHz, scanning speed 2000mm / s.

[0073] 4. Spray UV topcoat on the surface of the engraved pattern to form a protective layer; the UV topcoat composition is: 300 parts by weight of acrylate, 100 parts by weight of polyurethane acrylate resin, 10 parts by weight of polyether silicone, 100 parts by weight of isobutyl alcohol, 300 parts by weight of isopropyl alcohol, 100 parts by weight of butyl acetate, 150 parts by weight of ethylene glycol butyl ether, 50 parts by weight of 1,6-hexanediol diacrylate, 50 parts by weight of photoinitiator, and 30 parts by weight of trifunctional phosphate acrylate; spraying thickness is 30 microns, UV lamp irradiation curing, UV power is 1000mJ / cm 2 , irradiation time 60 seconds.

[0074] 5. Spray UV topcoat on the front of the plastic product. The composition is the same as step 4. The spraying thickness is 50 microns. UV lamp irradiation curing, UV power 3000mJ / cm 2 , irradiation time 120 seconds, forming a front mirror paint layer.

[0075] 6. Place the front mirror paint layer in a vacuum plating device and evacuate to 5×10 -3 Pa, vacuum evaporate 99.99% zinc sulfide, evaporation temperature 800 ° C, evaporation time 20 minutes, to obtain a semi-transparent electroplating layer with a thickness of 100 nanometers.

[0076] 7. The mirror aluminum layer on the back and the translucent layer on the front reflect each other to form a three-dimensional deep-view pattern effect.

[0077] 8. Spray colored UV varnish on the surface of the translucent electroplating layer with a thickness of 30 microns and cure with UV lamp with a UV power of 1000mJ / cm 2 , irradiation time 60 seconds, to form a surface protective layer.

[0078] Comparative Example 1 (corresponding to Example 1)

[0079] The difference from Example 1 is that: polyether silicone is not added to the back UV primer; the front vacuum evaporation material is changed to aluminum with a thickness of 50 nanometers.

[0080] Comparative Example 2 (corresponding to Example 2)

[0081] The difference from Example 2 is that: no back-side pattern engraving process is performed; the front-side vacuum evaporation material is changed to silver with a thickness of 80 nanometers.

[0082] Comparative Example 3 (corresponding to Example 3)

[0083] The difference from Example 3 is that the vacuum evaporated aluminum layer on the back is replaced by a copper layer with a thickness of 100 nanometers; and the vacuum plating treatment is not performed on the front.

[0084] Comparative Example 4 (corresponding to Example 4)

[0085] The difference from Example 4 is that: no back-side pattern engraving process is performed; the front-side vacuum evaporation material is changed to aluminum with a thickness of 100 nanometers.

[0086] Tests were carried out according to the embodiments and comparative examples, and the results are shown in the following table:

[0087] Model 1: Pattern 3D Evaluation

[0088] Purpose: To evaluate the effect of the back mirror aluminum layer and the front semi-transparent electroplating layer on the three-dimensional effect of the pattern

[0089] Method: Subjective scoring method

[0090] step:

[0091] 1. Select 10 observers to score the pattern based on three dimensions: sense of layering, sense of depth, and sense of reality. Each dimension is 10 points, with a total score of 30 points.

[0092] 2. Calculate the average score of each sample. The higher the score, the stronger the three-dimensional effect.

[0093] Model 2: Color reproduction test

[0094] Purpose: To evaluate the effect of semi-transparent electroplating on color reproduction

[0095] Method: Spectrophotometer measurement

[0096] step:

[0097] 1. Use a spectrophotometer to measure the spectral reflectance curve of samples with or without translucent electroplating layer in the visible light band (380-780nm).

[0098] 2. Calculate the chromaticity coordinates of the sample, such as L*, a*, and b* values, based on the spectral reflectance curve.

[0099] 3. Use the color difference formula ΔE*ab=[(ΔL*)2+(Δa*)2+(Δb*)2] to calculate the color difference with and without a translucent layer. The smaller the color difference, the higher the color reproduction.

[0100] Model 3: Coating Adhesion Test

[0101] Purpose: To evaluate the effect of special ingredients in UV primer and UV topcoat on coating adhesion

[0102] Method: GB / T 5210-2006 coating cross-cut test was used.

[0103] step:

[0104] 1. Use a cutter to draw squares on the surface of the sample. The number of squares should be no less than 25 and should be deep enough to reach the substrate.

[0105] 2. Use a brush to brush along the two diagonal directions for 5 times each to check whether the coating falls off at the edges and intersections of the grid.

[0106] 3. Cover the grid area with tape, press it with your fingers or an eraser, and quickly tear off the tape at an angle of about 60° to the line.

[0107] 4. Check coating peeling and assess adhesion level

[0108] Model 4: Coating wear resistance test

[0109] Objective: To evaluate the effect of special components in UV varnish on the wear resistance of coatings

[0110] Method: Using ASTM D4060 rotational abrasion tester method

[0111] step:

[0112] 1. Fix the coating sample on the wear tester and apply a certain load

[0113] 2. Set the wear revolutions (e.g. 500 revolutions), start wear, and record the mass changes before and after wear.

[0114] 3. Calculate the wear loss per 1000 revolutions (mg / 1000 revolutions) or the total wear loss to evaluate the wear resistance

[0115] Model 5: Metal layer hardness test

[0116] Purpose: To evaluate the effect of the front-side electroplating process on the hardness of the metal layer

[0117] Method: Using ASTM E384 Vickers hardness method

[0118] step:

[0119] 1. Fix the metal layer sample with the surface perpendicular to the indenter

[0120] 2. Select the appropriate pressing load (such as 10g) and holding time (such as 15s), and start pressing

[0121] 3. Measure the diagonal lengths of the indentation d1 and d2, and calculate the indentation area A

[0122] 4. Calculate the hardness value HV according to the formula: HV = 0.1891F / A

[0123] The test results are as follows:

[0124]

[0125] From the test results, it can be seen that the three-dimensional sense scores, color reproduction, adhesion, wear resistance and other performance indicators of Examples 1-4 are significantly better than those of the comparative example, among which Example 4 has the best comprehensive performance.

[0126] The embodiment can achieve such excellent decorative effect and performance, due to the following points:

[0127] 1. A uniform and dense high-reflectivity aluminum mirror is formed on the back, and fine pattern engraving is performed, laying the foundation for achieving a three-dimensional effect. After engraving, a UV protective layer is applied to make the pattern durable and wear-resistant.

[0128] 2. Form a translucent layer with high light transmittance on the front, and select indium or zinc sulfide materials with moderate refractive index to give a certain translucent texture while ensuring the restoration of the background color, adding more beauty.

[0129] 3. A specially formulated UV coating is interspersed throughout the decorative layer, containing polyether silicone and trifunctional acrylate, which respectively play a toughening and adhesion role, so that the bonding strength between the coating and the substrate is optimized, while also having excellent wear resistance.

[0130] 4. The vacuum electroplating process is used to deposit the mirror aluminum layer on the back and the translucent layer on the front to obtain a high-purity, dense and uniform metal layer, which provides a guarantee for achieving a stable depth of field effect.

[0131] 5. By cleverly utilizing the principles of light reflection and refraction, a unique visual depth effect is formed through the mutual reflection of the mirror layer on the back and the translucent layer on the front, making the flat decoration present a holographic naked-eye 3D effect with a strong visual impact.

[0132] All these innovative designs cooperate with each other and enhance synergy, ultimately making the decorative performance and usability performance of the embodiment reach unprecedented heights, and have extremely high industrial application value.

[0133] In addition, the present invention is also unique in terms of raw material selection and process control:

[0134] 1. The polyether silicone used in the UV coating modifies the flexibility of the coating, and the trifunctional acrylate increases the cross-linking density of the coating. Together, the coating achieves the optimal state of both rigidity and flexibility, and its compatibility with the metal layer is greatly improved.

[0135] 2. The raw materials for vacuum plating are high-purity aluminum, indium, and zinc sulfide. The process parameters such as deposition temperature, time, and vacuum degree are precisely controlled and optimized to ensure the high quality of the metal layer, laying the technological foundation for achieving a stable depth of field effect.

[0136] 3. Laser engraving uses nanosecond pulse laser, which has higher precision and smaller heat-affected zone than continuous laser. The outline of the engraved pattern is clearer and sharper, and the texture is richer, laying the foundation for the equipment to achieve refined patterns.

[0137] 4. UV light curing uses a high-power mercury lamp with an irradiance of up to 1000mW / cm 2 The above has fast curing speed and high curing degree, making the coating achieve the best performance. The proportion and dosage of each component in the entire UV system formula have also been systematically optimized to maximize performance.

[0138] From the above analysis, it can be seen that the present invention has carried out systematic optimization and combination in various aspects such as raw materials, formulas, processes, and equipment, and finally achieved an overall breakthrough in performance, which fully reflects the inventor's innovation ability and attention to details. This has opened up a new path for the surface decoration of high-end plastic products, with significant technological progress and broad application prospects. It is believed that with the promotion and application of the present invention, it will greatly promote the innovation of the appearance design of electronic products and inject new vitality into the vigorous development of industries such as consumer electronics and automotive interiors.

[0139] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. Plastic surface deep scene vacuum plating production process, characterized in that: The following steps are involved: Spraying a UV primer on the back of the plastic product to form a mirror primer layer; wherein the UV primer comprises the following components: 100-300 parts by weight of acrylate, 100-300 parts by weight of polyurethane acrylate resin, 10-30 parts by weight of polyether silicone, 100-250 parts by weight of isobutyl alcohol, 150-300 parts by weight of isopropyl alcohol, 100-250 parts by weight of butyl acetate, 50-150 parts by weight of ethylene glycol butyl ether, 10-50 parts by weight of 1,6-hexanediol diacrylate and 10-50 parts by weight of a photoinitiator; The mirror primer layer is placed in a vacuum plating device and evacuated to 5×10 -3 Below Pa, 99.99% high-purity aluminum is evaporated in vacuum to obtain a mirror-like electroplated aluminum layer; Using laser engraving equipment to engrave a desired pattern on the mirror-surface electroplated aluminum layer; Spraying UV topcoat on the surface of the engraved pattern to form a protective layer; wherein the UV topcoat comprises the following components: 100-300 parts by weight of acrylate, 100-300 parts by weight of polyurethane acrylate resin, 10-30 parts by weight of polyether silicone, 100-250 parts by weight of isobutyl alcohol, 150-300 parts by weight of isopropyl alcohol, 100-250 parts by weight of butyl acetate, 50-150 parts by weight of ethylene glycol butyl ether, 10-50 parts by weight of 1,6-hexanediol diacrylate, 10-50 parts by weight of photoinitiator and 10-30 parts by weight of trifunctional phosphate acrylate; The UV topcoat is sprayed on the front of the plastic product to form a mirror paint layer on the front; the mirror paint layer on the front is placed in a vacuum plating device and evacuated to 5×10 -3 Pa, vacuum evaporate 99.99% high-purity indium or zinc sulfide to obtain a semi-mirror surface electroplating layer.

2. The deep scene (thousand-layer scene) vacuum plating process for plastic surface according to claim 1 is characterized in that: The spray thickness of the UV primer is 20-50 microns, and after spraying, it is cured by UV lamp, and the UV power is ≥1000mJ / cm 2 , the irradiation time is 10-30 seconds.

3. The deep-view vacuum plating process for plastic surface according to claim 1, characterized in that: The evaporation power of the aluminum material in the vacuum electroplating is 25-50KW, the evaporation time is 10-30 seconds, and the thickness of the deposited aluminum layer is 50-200 nanometers.

4. The deep-view vacuum plating process for plastic surface according to claim 1, characterized in that: The laser engraving adopts a laser power of 10-200W, a wavelength of 1064nm, a pulse frequency of 1-20kHz, and a scanning speed of 500-2000mm / s.

5. The deep-view vacuum plating process for plastic surface according to claim 1, characterized in that: The spraying thickness of the UV topcoat is 10-30 microns, and after spraying, it is cured by UV lamp, and the UV power is ≥500mJ / cm 2 , the irradiation time is 10-30 seconds.

6. The deep-view vacuum plating process for plastic surface according to claim 1, characterized in that: The spraying thickness of the UV topcoat on the front of the plastic product is 20-50 microns. After spraying, it is cured by UV lamp irradiation, the UV power is ≥1000mJ / cm2, and the irradiation time is 30-120 seconds.

7. The deep-view vacuum plating process for plastic surface according to claim 1, characterized in that: The thickness of the indium material or zinc sulfide layer evaporated by the front vacuum is 30-100 nanometers, the evaporation temperature is 400-800° C., and the evaporation time is 5-20 minutes.

8. The deep-view vacuum plating process for plastic surface according to claim 1, characterized in that: The back mirror-surface electroplated aluminum layer and the front translucent electroplated layer form a deep-view stereoscopic pattern effect through mutual reflection.

9. The deep-view vacuum plating process for plastic surface according to claim 1, characterized in that: The UV varnish is transparent or colored UV varnish, with a spraying thickness of 10-30 microns. After spraying, it is cured by UV lamp irradiation, and the UV power is ≥500mJ / cm 2 , the irradiation time is 10-60 seconds.

10. The deep-view vacuum plating process for plastic surface according to any one of claims 1 to 9, characterized in that: The weight ratio of acrylate to polyurethane acrylate resin in the UV primer and UV topcoat is 1:1-1:3.

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