Automobile wireless charging decoration panel and manufacturing process thereof

Abstract

The invention discloses an automobile wireless charging decoration panel and a manufacturing process thereof, and belongs to the technical field of automobile part manufacturing. The manufacturing process comprises the following steps: carrying out injection molding on a PC / ABS alloy at the injection molding temperature of 250-260 DEG C to obtain a hard structure layer; carrying out injection molding on a TPE composition on the surface of the hard structure layer at the injection molding temperature of 170-180 DEG C to obtain a soft rubber layer; and spraying a waterborne polyurethane coating on the surface of the soft rubber layer to obtain the automobile wireless charging decoration panel. The manufacturing technology is low in cost and easy to operate, the obtained automobile wireless charging decoration panel has good aging resistance, scraping resistance and easy cleaning performance, and the high-grade decoration effects of complex textures, true / false stitches, multiple colors and the like can be conveniently constructed.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile component manufacturing, and in particular to an automobile wireless charging decorative panel and a manufacturing process thereof. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance the understanding of the overall background of the invention and should not be necessarily regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] With the rapid development of electric vehicles and intelligent connected vehicles, the optimization and upgrading of the design, materials and performance of automotive wireless charging decorative panels, as important functional components and decorative elements in the car, is particularly important. The automotive wireless charging decorative panels must ensure safety and durability during long-term use, including preventing safety hazards such as overheating and short circuits, as well as the ability to resist physical damage such as scratches and wear.

[0004] At present, there are two main appearance processes for automotive wireless charging panels on the market, one is suede or PVC coating, and the other is to cover the surface of the wireless charging decorative panel with a rubber pad. Suede or PVC coating requires the use of glue, and the price of low VOC (volatile organic compounds) is higher, and manual coating requires the addition of special spraying stations and manual coating stations, which greatly increases the price of a single product. The rubber pad process has problems such as single surface color, poor aging resistance, easy scratches on the surface, and low appearance quality, and it is difficult to achieve advanced decorative effects such as complex textures and real / fake stitches. In addition, both of the above processes have the problem of easy dust absorption and difficulty in cleaning. Therefore, how to provide a method for manufacturing a car wireless charging decorative panel with low cost, simple process, excellent aging resistance, easy to clean and scratch-resistant surface, and complex textures on the surface, is an urgent problem to be solved. Summary of the invention

[0005] In view of this, the present invention provides a car wireless charging decorative panel and a manufacturing process thereof. The manufacturing process provided by the present invention is simple and low-cost, and has the properties of beautiful appearance, high quality, good scratch resistance and aging resistance.

[0006] In a first aspect, the present invention provides a process for manufacturing a wireless charging decorative panel for an automobile, comprising the following steps:

[0007] S1, injection molding the PC / ABS alloy at a temperature of 250-260° C. to obtain a hard structure layer;

[0008] S2, injection molding the TPE composition on the surface of the hard structure layer at a temperature of 170-180° C. to obtain a soft rubber layer;

[0009] S3. Spray water-based polyurethane coating on the surface of the soft rubber layer to obtain a car wireless charging decorative panel.

[0010] Preferably, the PC / ABS alloy is made of the following components by mass fraction: PC 50-60%, ABS 20-30%, glass fiber 8-15%, compatibilizer 1-4%, flame retardant 4-10%, antioxidant 0.2-0.4%, and lubricant 0.2-0.4%.

[0011] Preferably, the TPE composition is made of the following components in mass fraction: SEBS 40-55%, polypropylene 15-25%, process oil 20-30%, anti-wear agent 3-5%, antistatic agent 1-2%, and colorant 0.5-2%.

[0012] Furthermore, the PC / ABS alloy and TPE composition also includes 0.1-0.3% of nano silicon dioxide.

[0013] Preferably, the waterborne polyurethane coating is made of the following components in mass fraction: 45-55% hydroxy acrylic resin, 15-25% polyurethane dispersion, 8-12% waterborne isocyanate curing agent, 3-5% amino resin, 2-4% nano-silicon dioxide, 0.5-1.5% fluorocarbon surface treatment agent, 1-2% ultraviolet absorber, 3-8% conductive agent, and 0.5-1% antibacterial agent.

[0014] Preferably, the time interval between the injection molding process of step S2 and the injection molding process of step S1 is within 25 seconds.

[0015] Preferably, the melt viscosity of the TPE composition is 1 / 3 to 1 / 2 of the melt viscosity of the PC / ABS alloy.

[0016] Preferably, the injection molding process of step S1 and step S2 is completed in a double-material injection mold, and the hot runner temperature of the double-material injection mold is 175-180°C.

[0017] Preferably, the thickness of the hard structure layer is 2-3 mm, the thickness of the soft adhesive layer is 0.8-1.2 mm; and the spraying thickness of the waterborne polyurethane coating is 30-50 μm.

[0018] In a second aspect, the present invention provides a car wireless charging decorative panel made by the above-mentioned manufacturing process.

[0019] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0020] The present invention replaces the existing suede or PVC coating process or rubber pad process in the form of PC / ABS hard structural layer + TPE soft rubber layer + surface coating in the manufacturing process of automobile wireless charging decorative panel for the first time. The manufacturing process is low in cost, simple in operation, and low in VOC. The obtained automobile wireless charging decorative panel has good aging resistance, scratch resistance and easy cleaning performance, and can achieve advanced decorative effects by engraving or corroding complex textures, real / fake stitches, etc. on the surface of the injection mold. The manufacturing process of the present invention can not only improve the safety and durability of the automobile wireless charging decorative panel during long-term use, but also improve its decorativeness. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation of the present invention. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 This is a real picture of the automotive wireless charging decorative panel according to Example 1 of the present invention;

[0023] Figure 2 This is a real picture of the automotive wireless charging decorative panel of Comparative Example 1 of the present invention;

[0024] Figure 3 The figures are the scratch resistance test picture (A) and the scratch resistance result (B) of Example 1 of the present invention. DETAILED DESCRIPTION

[0025] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0026] The present invention provides a manufacturing process of a wireless charging decorative panel for an automobile, comprising the following steps:

[0027] S1, injection molding the PC / ABS alloy at a temperature of 250-260° C. to obtain a hard structure layer;

[0028] S2, injection molding the TPE composition on the surface of the hard structure layer at a temperature of 170-180° C. to obtain a soft rubber layer;

[0029] S3. Spray water-based polyurethane coating on the surface of the soft rubber layer to obtain a car wireless charging decorative panel.

[0030] The present invention uses PC / ABS alloy for injection molding to prepare a hard structure layer, and then performs TPE composition injection molding thereon to form a soft rubber layer. This process does not require the use of glue, has a low VOC content, and by strictly controlling the injection molding temperature within a specific narrow range, an effective connection between the hard structure layer and the soft rubber layer is achieved, and degumming is not likely to occur. Then, a water-based polyurethane coating is sprayed on the surface of the soft rubber layer to form a protective layer, which can not only protect the hard structure layer and the soft rubber layer, but also achieve more functions, such as anti-fingerprint, conductivity, etc., and has low cost and good environmental protection.

[0031] In one or more embodiments of the present invention, the PC / ABS alloy is made of the following components by mass fraction: PC 50-60%, ABS 20-30%, glass fiber 8-15%, compatibilizer 1-4%, flame retardant 4-10%, antioxidant 0.2-0.4%, lubricant 0.2-0.4%. The present invention does not impose any special restrictions on the preparation method of the PC / ABS alloy, and the preparation method of the PC / ABS alloy commonly used in the art can be used. The PC / ABS alloy combines the high strength of PC (polycarbonate) and the impact resistance of ABS (acrylonitrile-butadiene-styrene copolymer), and has good heat resistance and processing properties. It is easy to injection mold and can mold complex and thin-walled products. The introduction of glass fiber is to improve the rigidity of the material. The introduction of the compatibilizer is to improve the compatibility between PC and ABS. The present invention preferably uses SMA (styrene-maleic anhydride copolymer resin) or ABS-g-MAH (maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer). The flame retardant may be a bromine-based or phosphorus-based or composite flame retardant, and the present invention does not impose any special restrictions on this. The present invention does not impose any special restrictions on the antioxidant and lubricant, and the antioxidant and lubricant commonly used in the art can be used.

[0032] In one or more embodiments of the present invention, the TPE composition is made of components including the following mass fractions: SEBS 40-55%, polypropylene 15-25%, operating oil 20-30%, anti-wear agent 3-5%, antistatic agent 1-2%, and colorant 0.5-2%. The present invention does not impose any special restrictions on the preparation method of the TPE composition, and the preparation method of the TPE composition commonly used in the art can be adopted. SEBS (saturated styrene-ethylene / butylene-styrene block copolymer) is used as the substrate, and polypropylene is used as the carrier. The operating oil is preferably paraffin oil, and the anti-wear agent is preferably a polysiloxane complex. The present invention does not impose any special restrictions on the antistatic agent and the colorant, and the antistatic agent and the colorant commonly used in the art can be used. Those skilled in the art can choose according to specific needs.

[0033] In the present invention, the PC / ABS alloy and the TPE composition further include 0.1-0.3% of nano-silica. The introduction of nano-silica can be used to improve dimensional stability.

[0034] In one or more embodiments of the present invention, the waterborne polyurethane coating is made of components including the following mass fractions: 45-55% of hydroxyl acrylic resin, 15-25% of polyurethane dispersion, 8-12% of waterborne isocyanate curing agent, 3-5% of amino resin, 2-4% of nano-silica, 0.5-1.5% of fluorocarbon surface treatment agent, 1-2% of ultraviolet absorber, 3-8% of conductive agent, and 0.5-1% of antibacterial agent. In the above formula, the hydroxyl acrylic resin and the polyurethane dispersion are used as the main film-forming substances, the amino resin is used as a cross-linking agent, the nano-silica can enhance the wear resistance, and the introduction of the fluorocarbon surface treatment agent can reduce the surface energy of the coating and endow it with anti-fingerprint performance. The conductive agent plays a role in conducting electricity in the functional area, and preferably conductive carbon black is used. The present invention does not impose special restrictions on the type of antibacterial agent, and for example, silver ion complexes can be used.

[0035] In one or more embodiments of the present invention, the time interval between the injection molding process of step S2 and the injection molding process of step S1 is within 25 s, and more preferably 10-20 s. If the interval time is too long, interfacial crystallization will occur between the hard structure layer and the soft rubber layer, resulting in debonding.

[0036] In one or more embodiments of the present invention, the melt viscosity of the TPE composition is 1 / 3-1 / 2 of the melt viscosity of the PC / ABS alloy. This design is to make the hard structure layer and the soft rubber layer have better compatibility and improve the interfacial bonding strength between the two.

[0037] In one or more embodiments of the present invention, the injection molding processes of step S1 and step S2 are completed in a two-component injection molding die, and the hot runner temperature of the two-component injection molding die is 175-180°C.

[0038] In one or more embodiments of the present invention, the thickness of the hard structure layer is 2-3 mm, and the thickness of the soft rubber layer is 0.8-1.2 mm; the spraying thickness of the waterborne polyurethane coating is 30-50 μm. If the spraying thickness is too thin, the scratch resistance and abrasion resistance will be poor; if the spraying thickness is too thick, on the one hand, the cost will increase, and on the other hand, a stacking phenomenon may occur, which will have an adverse impact on the appearance, touch, etc.

[0039] In one or more embodiments of the present invention, during the injection molding processes of step S1 and step S2, the temperature of the hot runner is 175-180°C.

[0040] The present invention can engrave or etch different textures on an injection mold, thereby constructing complex textures on the surface of the soft rubber, achieving different tactile sensations and improving the sensory quality of the product.

[0041] The present invention also provides an automotive wireless charging decorative panel prepared by the above manufacturing process.

[0042] The technical solution of the present invention will be further described below in conjunction with specific embodiments. The present invention places no special restrictions on the sources of the reagents used in the following embodiments, and commercially available products well-known to those skilled in the art can be used.

[0043] Example 1

[0044] This example provides a manufacturing process for an automotive wireless charging decorative panel.

[0045] In this example, the automotive wireless charging decorative panel includes a rigid structure layer, a soft rubber layer, and an aqueous polyurethane surface coating. The rigid structure layer is made of components including the following mass fractions: 55% PC, 25% ABS, 10% glass fiber, 2% compatibilizer (ABS-g-MAH), 7.4% flame retardant, 0.4% antioxidant (1010 + 168), and 0.2% lubricant. The soft rubber layer is made of components including the following mass fractions: 50% SEBS, 20% polypropylene, 25% processing oil (paraffin oil KV100), 3% wear-resistant agent (polysiloxane composite), 1% antistatic agent, and 1% colorant. The aqueous polyurethane surface coating is made of components including the following mass fractions: 50% hydroxyl acrylic resin, 22% polyurethane dispersion, 12% aqueous isocyanate curing agent, 4% amino resin, 3% nano-silica, 1.5% fluorocarbon surface treatment agent, 2% ultraviolet absorber, 5% conductive carbon black, and 0.5% antibacterial agent.

[0046] The specific preparation process is as follows:

[0047] Control the hot runner temperature of the two-component injection mold to 175°C, inject the PC / ABS alloy for injection molding, the injection temperature is 255°C, to obtain the rigid structure layer with a thickness of 2.5 mm; after about 15 s, inject the TPE composition on the surface of the rigid structure layer, the melt viscosity of the TPE composition is 1 / 2 of the melt viscosity of the PC / ABS alloy, and the injection temperature is 175°C, to obtain the soft rubber layer with a thickness of 1 mm. Finally, spray the aqueous polyurethane coating on the surface of the soft rubber layer, and the spray thickness is 40 μm, thus obtaining the automotive wireless charging decorative panel.

[0048] Example 2

[0049] The difference between this example and Example 1 lies in that the specific preparation process is different. The preparation process of this example is as follows:

[0050] The hot runner temperature of the two-shot injection mold is controlled at 175 °C, and the PC / ABS alloy is injection molded at an injection temperature of 260 °C to obtain a hard structure layer with a thickness of 2.5 mm. After about 15 s, a TPE composition is injection molded on the surface of the hard structure layer. The melt viscosity of the TPE composition is 1 / 3 of the melt viscosity of the PC / ABS alloy, and the injection temperature is 180 °C to obtain a soft rubber layer with a thickness of 1 mm. Finally, an aqueous polyurethane coating is sprayed on the surface of the soft rubber layer with a spraying thickness of 40 μm, and the automotive wireless charging decorative panel is obtained.

[0051] Example 3

[0052] The difference between this example and Example 1 is that the components of the hard structure layer and the soft rubber layer are different. The hard structure layer of this example is made of components including the following mass fractions: 55% PC, 25% ABS, 10% glass fiber, 2% compatibilizer (ABS-g-MAH), 7.2% flame retardant, 0.4% antioxidant (1010 + 168), 0.2% lubricant, and 0.2% nano-silica. The soft rubber layer is made of components including the following mass fractions: 50% SEBS, 20% polypropylene, 25% processing oil (paraffin oil KV100), 3% wear-resistant agent (polysiloxane composite), 1% antistatic agent, 0.8% colorant, and 0.2% nano-silica.

[0053] Comparative Example 1

[0054] The difference between this comparative example and Example 1 is that the injection temperature of the soft rubber layer in this comparative example is 190 °C.

[0055] Comparative Example 2

[0056] The difference between this comparative example and Example 1 is that the spraying thickness of the aqueous polyurethane coating in this comparative example is 10 μm.

[0057] Test Example

[0058] 1. Degumming Phenomenon

[0059] The physical picture of the automotive wireless charging decorative panel of Example 1 is as Figure 1 shown. It can be seen that the surface is complete and there is no degumming phenomenon. The physical picture of the automotive wireless charging decorative panel of Comparative Example 1 is as Figure 2 shown. It can be seen that there is a degumming phenomenon on its surface. It shows that the injection temperature has a great influence on the automotive wireless charging decorative panel, and the appropriate injection temperature ensures the bonding performance between the hard structure layer and the soft rubber layer.

[0060] 2. Scratch Resistance Test

[0061] Method Standard: Q / SQR T1-64 2012

[0062] Test description: Use a hardness bar of model 318 with a probe diameter of 1 mm to conduct a manual test according to Q / SQR T1-64. Then, check and evaluate it under a D65 standard light source at a distance of about 300 mm from the human eye. The test steps of Q / SQR T1-64 Method A (manual scratching method) are as follows: Use the hardness bar to scratch multiple 5 - 50 mm straight lines on the surface of the specimen, scratch only once at the same position, and there should be no intersection between any two scratches. Then, observe the damage at the scratched area, and the results are summarized in Table 1.

[0063] Table 1 Scratch resistance test results

[0064] Number Scratch resistance test results Number Scratch resistance test results Example 1 No surface damage Comparative example 1 The degumming phenomenon on the surface is aggravated Example 2 No surface damage Comparative example 2 There is surface damage Example 3 No surface damage

[0065] The scratch resistance test pictures and scratch resistance results of Example 1 are shown in Figure 3 , and it can be seen that the surface remains intact after the scratch resistance test. For Comparative Example 1, due to the poor bonding performance between the hard and soft layers, the delamination phenomenon worsens after the scratch resistance test; for Comparative Example 2, the surface coating is too thin, resulting in surface damage and poor scratch resistance performance.

[0066] 2. Abrasion resistance test

[0067] Method standard: GB / T 3920 2008

[0068] Test description: Instrument: Friction color fastness tester, friction head diameter (16 ± 0.1) mm, friction load (9 ± 0.2) N, friction cloth: 105F09. It meets the requirements of GB / T 3920 standard. Observe the appearance change of the sample after the test, and the staining grade judgment refers to GB / T 251. During the test, polyurethane foam must be used as the backing layer between the friction head and the friction cloth.

[0069] Dry friction: Select the appropriate number of friction times according to the part load requirements.

[0070] Wet friction: Immerse the friction object in the medium (0.5% (v / v) surfactant aqueous solution, White Cat classic formula dishwashing liquid), 95% (v / v) alcohol) for at least one minute, then place it on the filter paper to absorb water, and use the friction cloth soaked in the medium to conduct the test according to GB / T 3920.

[0071] Number of friction times: 100 times for dry friction and 10 times for wet friction

[0072] The test results are summarized in Table 2.

[0073] Table 2 Abrasion resistance test results

[0074] Number Friction resistance test results Number Friction resistance test results Example 1 The surface is intact and there is no obvious damage Comparative example 1 The degumming phenomenon on the surface is aggravated Example 2 The surface is intact and there is no obvious damage Comparative example 2 There is surface damage Example 3 The surface is intact and there is no obvious damage

[0075] As can be seen from Table 2, after the friction resistance tests of Examples 1 to 3, the surfaces remained intact, indicating excellent wear resistance. In Comparative Example 1, the degumming phenomenon worsened after the friction resistance test, and in Comparative Example 2, surface damage occurred, indicating that both the injection molding temperature and the surface coating thickness can affect the friction resistance performance.

[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A manufacturing process for a car wireless charging decorative panel, characterized in that: The steps include: S1, injection molding the PC / ABS alloy at a temperature of 250-260° C. to obtain a hard structure layer; S2, injection molding the TPE composition on the surface of the hard structure layer at a temperature of 170-180° C. to obtain a soft rubber layer; S3. Spray water-based polyurethane coating on the surface of the soft rubber layer to obtain a car wireless charging decorative panel.

2. The manufacturing process according to claim 1, characterized in that: The PC / ABS alloy is made of the following components by mass fraction: PC 50-60%, ABS 20-30%, glass fiber 8-15%, compatibilizer 1-4%, flame retardant 4-10%, antioxidant 0.2-0.4% and lubricant 0.2-0.4%.

3. The manufacturing process according to claim 1, characterized in that: The TPE composition is made of the following components in mass fraction: 40-55% of SEBS, 15-25% of polypropylene, 20-30% of process oil, 3-5% of wear-resistant agent, 1-2% of antistatic agent and 0.5-2% of colorant.

4. The manufacturing process according to claim 2 or 3, characterized in that: The PC / ABS alloy and TPE composition also includes 0.1-0.3% of nano silicon dioxide.

5. The manufacturing process according to claim 1, characterized in that: The waterborne polyurethane coating is made of the following components by mass fraction: 45-55% of hydroxyl acrylic resin, 15-25% of polyurethane dispersion, 8-12% of waterborne isocyanate curing agent, 3-5% of amino resin, 2-4% of nano silicon dioxide, 0.5-1.5% of fluorocarbon surface treatment agent, 1-2% of ultraviolet absorber, 3-8% of conductive agent and 0.5-1% of antibacterial agent.

6. The manufacturing process according to claim 1, characterized in that: The time interval between the injection molding process of step S2 and the injection molding process of step S1 is within 25 seconds.

7. The manufacturing process according to claim 1, characterized in that: The melt viscosity of the TPE composition is 1 / 3 to 1 / 2 of the melt viscosity of the PC / ABS alloy.

8. The manufacturing process according to claim 1, characterized in that: The injection molding process of step S1 and step S2 is completed in a double-material injection mold, and the hot runner temperature of the double-material injection mold is 175-180°C.

9. The manufacturing process according to claim 1, characterized in that: The thickness of the hard structure layer is 2-3 mm, the thickness of the soft rubber layer is 0.8-1.2 mm; the spraying thickness of the waterborne polyurethane coating is 30-50 μm.

10. An automobile wireless charging decorative panel manufactured by the manufacturing process according to any one of claims 1 to 9.

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