Environment-friendly coating production process for automotive upholstery

Abstract

The invention provides an environment-friendly coating production process for automotive upholstery, and relates to the technical field of coating production, and the environment-friendly coating production process comprises the following steps: S1, surface pretreatment: a cleaning agent is uniformly applied to the exterior of a base material, a brush is operated at a rotating speed of 230-500 RPM, and a spraying period is maintained for 5-15 min; after the spraying process is finished, clean wiping cloth without fiber falling is used for removing dirt, and standing is conducted for 3-8 min in the environment of 35-45 DEG C; according to the method, the cleaning agent is applied in the base material cleaning stage, and the brush is operated at the specific rotating speed, so that deep removal of pollutants is achieved, and the adhesion performance of follow-up paint is improved; the base material rotates in a centrifugal machine at a low rotating speed in a radius range, so that the surface molecular state tends to be stable, and the compatibility of the coating and a base material interface is improved; the electrostatic spraying equipment conducts primer coating under the conditions of specific voltage, spray gun caliber and atomization pressure, the spraying uniformity is enhanced, and the problem that the thickness of a paint film is not uniform is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of coating production, and in particular to an environmentally friendly coating production process for automobile interior decoration parts. Background Art

[0002] The field of coating technology mainly involves the use of coatings to coat the surface of materials or workpieces to achieve the purpose of protection, decoration, functional modification, etc. Common processes include surface pretreatment, spraying, electrophoretic coating, drying and curing, etc. This field covers many aspects such as coating selection, coating equipment and process control, and coating quality inspection.

[0003] In the prior art, the surface pretreatment stage is simply spray cleaning, which results in the failure to fully remove the tiny dirt on the substrate surface; if the surface cleaning treatment is not in place, it is easy to cause quality problems such as weak adhesion of the coating film and paint film shedding; in addition, conventional coating technology lacks pre-adaptation treatment of the substrate surface, and the spraying process often directly applies the coating. Due to the unstable molecular state of the substrate surface, the coating film is prone to blistering or uneven local thickness. Therefore, improvements are needed. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an environmentally friendly coating production process for automobile interior decoration parts.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an environmentally friendly coating production process for automobile interior decoration parts, comprising the following steps: S1, surface pretreatment, apply the cleaning agent evenly to the outside of the substrate, run the brush at 230-500RPM, and maintain a spraying period of 5-15 minutes; after the spraying process, use a clean, fiber-free wiping cloth to remove dirt and let it stand at 35-45℃ for 3-8 minutes to obtain a clean interior part; S2, microgravity pre-adaptation, placing the cleaned interior parts in a centrifuge, setting the rotation speed to 50-100 RPM, and keeping the rotation for 10-20 minutes; obtaining interior parts with preliminary microgravity adaptation characteristics; S3, primer coating; applying environmentally friendly primer to the interior parts with preliminary microgravity adaptation characteristics; using electrostatic spraying equipment, with an electrostatic voltage range of 40-80kV to assist spraying, setting the spray gun caliber in the range of 1.2-1.8mm, and maintaining the atomization pressure at 0.2-0.4MPa; spraying at a distance of 15-25cm from the substrate surface, and leveling for 5-10min at 20-30℃ to obtain interior parts with primer coating completed; S4, pulse electric field pretreatment: applying an intermittent pulse electric field to the surface of the interior part coated with primer, with the voltage peak controlled at 2-5 kV and the pulse width set at 1-3 μs; the interval period is maintained at 1-2 ms, so as to obtain a primer coating with optimized stratification; S5, coating; spraying the primer coating that has achieved layer optimization using environmentally friendly color coating; placing the interior parts in a spray chamber, controlling the spray gun flow rate at 50-80 mL / min, and obtaining a coating that has been completed with color spraying.

[0006] Preferably, the method further comprises: S6, pulse electric field coating; continuously applying a pulse electric field to the surface of the coating after color spraying; adjusting the voltage waveform peak value within the range of 1.5-3kV, controlling the pulse repetition frequency within the range of 200-500Hz, and applying the pulse electric field for 5-10min, so as to obtain a color coating with improved uniformity; S7, femtosecond laser local curing; the color coating with improved uniformity is locally cured using a femtosecond laser light source; the laser pulse duration can be set in the range of 100-300fs, the single pulse energy is controlled at 0.5-1.0mJ, the scanning speed is maintained at 10-20mm / s, and the action area is concentrated on the corners that are susceptible to wear, so as to obtain a coating that has been completed with laser local curing.

[0007] Preferably, the method further comprises: S8, customizing texture and gloss; applying a laser engraving process to the coating that has been partially laser-cured, with the wavelength set in the range of 1064-1080nm and the laser power controlled in the range of 5-10W, to obtain a surface with texture and gloss effects; S9, color coating; adding a second layer of environmentally friendly color coating to the surface with texture and gloss effect; applying with an electrostatic spray gun at a voltage range of 60-100 kV, maintaining a spraying distance of 15-25 cm, to obtain a surface that has been completed with secondary color coating.

[0008] Preferably, the method further includes: S10, curing and baking; curing the surface that has completed the secondary color coating; using an oven, heating at 60-80°C for 20-40 minutes, combining ultraviolet light with a wavelength in the range of 365-395nm to assist in curing, to obtain an environmentally friendly coated interior component with terminal protection performance.

[0009] Preferably, in step S1, the cleaning agent is prepared by mixing anionic surfactant, deionized water, citric acid and isopropyl alcohol in a ratio of 1:90:3:6.

[0010] Preferably, in step S3, the environmentally friendly primer is prepared by mixing acrylic resin, epoxy resin, ethylenediamine and titanium dioxide in a ratio of 2:1:0.5:1.

[0011] Preferably, in step S5, the environmentally friendly color coating is prepared by mixing water-based acrylic emulsion, carbonate, leveling agent and ultraviolet absorber UV-0 in a ratio of 5:1:0.5:0.3.

[0012] Preferably, in step S9, the second layer of environmentally friendly color coating is formed by mixing water-based acrylic emulsion, copper powder, leveling agent and ultraviolet absorber UV-0 in a ratio of 6:2:0.5:0.3.

[0013] Compared with the prior art, the present invention achieves deep removal of pollutants and improves the adhesion performance of subsequent coatings by applying a cleaning agent during the substrate cleaning stage and running a brush at a specific speed; the substrate rotates at a low speed and radius range in a centrifuge to stabilize the surface molecular state and improve the compatibility of the coating and substrate interface; the electrostatic spraying equipment applies the primer under specific voltage, spray gun caliber and atomization pressure conditions to enhance the spraying uniformity and effectively avoid the problem of uneven paint film thickness; when an intermittent pulse electric field acts on the coating surface, the voltage peak and pulse width are controlled to optimize the coating microstructure, eliminate the internal stress of the primer coating, and improve the surface density and durability of the coating; when color coating is sprayed, the spray gun flow rate is accurately controlled to achieve uniformity of coating thickness and improvement of decorative effect; the overall process operates in a coordinated manner, so that the stability and environmental protection performance of the coating are effectively enhanced, the appearance quality of the coating is significantly improved, and the emission of volatile organic compounds during the coating of interior parts is reduced, achieving an effective unity of environmental protection and decorativeness in the coating process.

[0014] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The present invention proposes a preparation step diagram of an environmentally friendly coating production process for automobile interior decoration parts. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the 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 creative work are within the scope of protection of the present invention.

[0018] Embodiment 1, an environmentally friendly coating production process for automobile interior parts, comprising the following steps: S1, surface pretreatment, apply the cleaning agent evenly to the outside of the substrate, run the brush at 500RPM, and maintain a spraying period of 5 minutes; after the spraying process, use a clean, fiber-free wiping cloth to remove dirt, and let it stand at 35℃ for 8 minutes to obtain a clean interior part; S2, microgravity pre-adaptation, placing the cleaned interior parts in a centrifuge, setting the speed to 50 RPM, and keeping rotating for 20 minutes; obtaining interior parts with preliminary microgravity adaptation characteristics; S3, primer coating: apply environmentally friendly primer to interior parts with preliminary microgravity adaptation characteristics; use electrostatic spraying equipment, with an electrostatic voltage range of 80kV to assist spraying, the spray gun caliber is set at 1.2mm, and the atomization pressure is maintained at 0.2MPa; spray at a distance of 25cm from the substrate surface, and level for 5min at 30℃ to obtain interior parts with primer coating completed; S4, pulse electric field pretreatment: applying an intermittent pulse electric field to the surface of the interior part that has been primed, with the voltage peak controlled at 2kV and the pulse width set at 1μs; the interval period is maintained at 1ms, and a primer coating with optimized stratification is obtained; S5, paint coating; spraying the primer coating that has achieved layer optimization using environmentally friendly color paint; placing the interior parts in the spray chamber, controlling the spray gun flow rate at 50mL / min, and obtaining a coating that has been completed with color spraying.

[0019] S6, pulse electric field coating: continuously apply pulse electric field to the surface of the coating that has been sprayed with color; the voltage waveform peak is adjusted within the range of 3kV, the pulse repetition frequency is controlled at 500Hz, and the action time is 5min, so as to obtain a color coating with improved uniformity; S7, femtosecond laser local curing; use a femtosecond laser light source to implement local curing treatment on the color coating with improved uniformity; the laser pulse duration can be set at 300fs, the single pulse energy is controlled at 0.5mJ, the scanning speed is maintained at 20mm / s, and the action area is concentrated on the corners that are susceptible to wear, so as to obtain a coating that has been completed with laser local curing.

[0020] S8, custom texture and gloss: laser engraving is applied to the partially laser-cured coating, with the wavelength set at 1080nm and the laser power controlled at 10W to obtain a surface with texture and gloss effects; S9, color coating; adding a second layer of environmentally friendly color coating to the surface with texture and gloss effect; using an electrostatic spray gun to apply at a voltage range of 100kV, and maintaining the spraying distance at 25cm to obtain a surface that has been completed with secondary color coating.

[0021] S10, curing and baking; curing the surface that has completed the secondary color coating; using an oven, heating at 60°C for 40 minutes, combined with ultraviolet light assisted curing at a wavelength of 365nm, to obtain environmentally friendly coated interior parts with terminal protection performance.

[0022] By adopting high-speed brush spraying and microgravity pre-adaptation centrifugal process in the pretreatment stage, the dirt particles on the surface of the interior parts are completely removed and the adhesion of the substrate surface and the uniformity of the coating are improved; in the painting stage, electrostatic spraying uses precisely controlled voltage, spray gun caliber and atomization pressure, combined with appropriate distance and leveling environment, to make the spray thickness of the coating more uniform and delicate, reducing paint waste; intermittent pulse electric field application effectively promotes the orderly arrangement of particles inside the coating, improves the density of the coating and the surface gloss; femtosecond laser local curing treatment enhances the wear resistance of the edge area of ​​the coating and extends the overall service life of the interior parts; laser engraving accurately adjusts the surface texture and gloss effect, improving the decorative beauty and tactile comfort; in addition, the final coating is further enhanced in stability and weather resistance after UV-assisted thermal curing, effectively reducing the incidence of defects such as coating cracking and fading, and realizing the full performance of environmentally friendly coatings, ensuring the safety of the vehicle environment, and improving the quality of user experience.

[0023] In this embodiment, in step S1, the cleaning agent is prepared by mixing anionic surfactant, deionized water, citric acid and isopropyl alcohol in a ratio of 1:90:3:6.

[0024] In this embodiment, in step S3, the environmentally friendly primer is prepared by mixing acrylic resin, epoxy resin, ethylenediamine and titanium dioxide in a ratio of 2:1:0.5:1.

[0025] In this embodiment, in step S5, the environmentally friendly color coating is prepared by mixing water-based acrylic emulsion, carbonate, leveling agent and ultraviolet absorber UV-0 in a ratio of 5:1:0.5:0.3.

[0026] In this embodiment, in step S9, the second layer of environmentally friendly color coating is formed by mixing water-based acrylic emulsion, copper powder, leveling agent and ultraviolet absorber UV-0 in a ratio of 6:2:0.5:0.3.

[0027] Embodiment 2, an environmentally friendly coating production process for automobile interior parts, comprising the following steps: S1, surface pretreatment, apply the cleaning agent evenly to the outside of the substrate, run the brush at 400RPM, and maintain a spraying period of 5 minutes; after the spraying process, use a clean, fiber-free wiping cloth to remove dirt, and let it stand at 45℃ for 5 minutes to obtain a clean interior part; S2, microgravity pre-adaptation, placing the cleaned interior parts in a centrifuge, setting the speed to 50 RPM, and keeping rotating for 15 minutes; obtaining interior parts with preliminary microgravity adaptation characteristics; S3, primer coating: apply environmentally friendly primer to interior parts with preliminary microgravity adaptation characteristics; use electrostatic spraying equipment, with an electrostatic voltage range of 45kV to assist spraying, the spray gun caliber is set at 1.2mm, and the atomization pressure is maintained at 0.3MPa; spray at a distance of 20cm from the substrate surface, and level for 5min at 25℃ to obtain interior parts with primer coating completed; S4, pulse electric field pretreatment: applying an intermittent pulse electric field to the surface of the interior part that has been primed, with the voltage peak controlled at 5kV and the pulse width set at 2μs; the interval period is maintained at 1ms, and a primer coating with optimized stratification is obtained; S5, paint coating; spraying the primer coating that has achieved layer optimization using environmentally friendly color paint; placing the interior parts in the spray chamber, controlling the spray gun flow rate at 50mL / min, and obtaining a coating that has been completed with color spraying.

[0028] S6, pulse electric field coating: continuously apply pulse electric field to the surface of the coating that has been sprayed with color; the voltage waveform peak is adjusted within the range of 3kV, the pulse repetition frequency is controlled at 500Hz, and the action time is 5min, so as to obtain a color coating with improved uniformity; S7, femtosecond laser local curing; use a femtosecond laser light source to implement local curing treatment on the color coating with improved uniformity; the laser pulse duration can be set at 300fs, the single pulse energy is controlled at 1.0mJ, the scanning speed is maintained at 20mm / s, and the action area is concentrated on the corners that are susceptible to wear, so as to obtain a coating that has been completed with laser local curing.

[0029] S8, custom texture and gloss: laser engraving is applied to the partially laser-cured coating, with the wavelength set at 1080nm and the laser power controlled at 10W to obtain a surface with texture and gloss effects; S9, color coating; adding a second layer of environmentally friendly color coating to the surface with texture and gloss effect; using an electrostatic spray gun to apply at a voltage range of 100kV, and maintaining the spraying distance at 20cm to obtain a surface that has been completed with secondary color coating.

[0030] S10, curing and baking; curing the surface that has completed the secondary color coating; using an oven, heating at 60°C for 30 minutes, combined with ultraviolet light assisted curing at a wavelength of 390nm, to obtain environmentally friendly coated interior parts with terminal protection performance.

[0031] In this embodiment, in step S1, the cleaning agent is prepared by mixing anionic surfactant, deionized water, citric acid and isopropyl alcohol in a ratio of 1:90:3:6.

[0032] In this embodiment, in step S3, the environmentally friendly primer is prepared by mixing acrylic resin, epoxy resin, ethylenediamine and titanium dioxide in a ratio of 2:1:0.5:1.

[0033] In this embodiment, in step S5, the environmentally friendly color coating is prepared by mixing water-based acrylic emulsion, carbonate, leveling agent and ultraviolet absorber UV-0 in a ratio of 5:1:0.5:0.3.

[0034] In this embodiment, in step S9, the second layer of environmentally friendly color coating is formed by mixing water-based acrylic emulsion, copper powder, leveling agent and ultraviolet absorber UV-0 in a ratio of 6:2:0.5:0.3.

[0035] Experimental methods: Adhesion test method: This test evaluates the adhesion performance of the coating on the substrate. The standard method used can refer to the grid test in ISO 2409 or GB / T 9286. The specific experimental process is as follows: First, select a representative automotive interior coating sample to ensure that its surface is clean, dry and oil-free. Before the experiment, the sample is placed in a standard environment (temperature 23±2℃, relative humidity 50±5%) for at least 24 hours to avoid interference with adhesion caused by changes in the external environment. Then use a special grid knife to cut a criss-cross grid on the coating surface according to the pre-set cutting distance (usually 1mm or 2mm, depending on the coating thickness and relevant standards). When cutting, ensure that the blade is clear and the depth is consistent, and the substrate is cut without excessive damage to the substrate. After cutting, use a soft brush to gently remove the fallen debris, then use transparent tape to stick to the grid surface, apply uniform pressure and tear it off quickly. According to the degree of coating tearing off, the samples are divided into different grades from 0B to 5B, where 5B indicates the best adhesion and 0B indicates extremely poor adhesion. Repeatability should be ensured during testing. Usually, different areas are selected on the same sample for parallel testing, or multiple samples are prepared under the same conditions and repeated tests are performed to obtain more objective data. If the coating is damaged and the edges are smooth, it means that the adhesion is strong; if large pieces are peeled off in the 100-grid area, it means that the adhesion is obviously insufficient.

[0036] Hardness test method: Hardness is an important indicator for evaluating the ability of a coating to resist local deformation or scratching. This experiment was conducted with reference to the pencil hardness test in ASTM D3363 or GB / T 6739 standards. The test steps include the following aspects: First, the prepared and cured sample needs to be placed in a standard laboratory environment with a temperature of 23±2℃ and a humidity of 50±5% for more than 24 hours to balance the internal stress of the coating. Then select a series of standard pencils with hardness ranging from low to high (such as 6B, 5B, 4B...HB...H, 2H, 3H, etc.), ensure that the front end of the pencil lead is ground into a plane at an appropriate angle (usually about 45 degrees), and remove excess loose graphite particles. During the test, place the pencil obliquely on the coating surface with a fixed pressure (generally 7.5N±0.1N or selected according to the standard), and push it in a fixed direction for a specified distance (about 1cm). If there are no obvious scratches or damage on the coating surface, it means that the hardness is at least not lower than the hardness of the pencil; on the contrary, if there are clearly visible scratches on the coating, it is necessary to replace a pencil with a softer hardness grade and retest. By progressively increasing from soft to hard, the hardest pencil hardness that will not scratch the coating is finally selected as the coating hardness result. In order to ensure the accuracy of the test, three points are usually tested on the same coating sample and the average value is taken as the final result. This method can quickly and intuitively evaluate the scratch resistance of the coating surface. In the automotive interior environment, the higher the hardness, the better the coating can resist daily wear and tear.

[0037] Gloss test method: Gloss is an important indicator to measure the optical reflective performance of the coating surface. Especially for automotive interiors, the appropriate gloss can not only improve the aesthetics, but also avoid visual interference caused by excessive reflection. This experiment is carried out according to the 60° angle gloss meter measurement method of ISO 2813 or GB / T 9754. First, on the sample that has been treated with constant temperature and humidity (23±2℃, 50±5%RH) for more than 24 hours, select a flat and defect-free area for testing. The gloss meter should be calibrated before use to ensure that the instrument reading is accurate and reliable. During the test, the measuring port of the gloss meter is close to the surface of the sample coating to ensure that the angle between the test light source and the detector and the sample surface is 60°; this angle is a commonly used measurement angle for conventional automotive parts and can better reflect the medium and high gloss range. Each sample needs to be measured at multiple points at different positions, generally not less than three test points, to calculate the average value and judge its gloss level. During the measurement process, avoid external stray light interference or too strong ambient light. If necessary, use a light shield or conduct it in a darkroom environment. After the measurement is completed, the result is compared with the standard plate or the established gloss reference value in the industry. If the reading is larger, the reflection intensity of the surface is stronger and the gloss is brighter. In the comparative test, the gloss difference of each sample can be clearly seen, so as to judge whether the coating process of the present invention has a significant improvement on the optical reflection of the surface.

[0038] Solvent resistance test method: Solvent resistance is directly related to the resistance of automotive interior parts to various cleaning agents and chemicals in daily use. This experiment can refer to ASTM D4752 or the industry-recognized methyl ethyl ketone (MEK) double rub method for evaluation. The specific steps include: first, place the prepared and fully cured sample in a constant temperature and humidity environment for more than 24 hours to eliminate internal stress as much as possible and stabilize the coating structure. Then, soak a soft and absorbent cotton cloth or fiber-free wiping cloth in MEK solvent, and ensure that the solvent is evenly distributed but not dripping. During the test, the operator holds the cotton cloth soaked with solvent and wipes the surface of the sample back and forth with a fixed pressure (generally about 1N-2N), and each reciprocating stroke is counted as a double rub. The key to the operation is to ensure consistent wiping direction and moderate speed (about 30 times / minute), and at the same time ensure that the solvent can always fully contact the coating surface without excessive soaking. When the coating shows obvious discoloration, softening, shedding or severe scratches, record the number of double rubs at that time. The larger the number, the better the solvent resistance. Comparative Example 1, Example 1 and Example 2 need to be measured under the same conditions, and the wiping force and the amount of solvent used must be strictly controlled to eliminate the deviation caused by non-technical factors. This method is simple and easy to operate, has good reproducibility, and can effectively distinguish the effects of different coating processes on the density and cross-linking degree of the coating.

[0039] The finished materials prepared in Examples 1-2 were tested, wherein Comparative Example 1 is the process disclosed in Patent Publication No. CN115044267A, and the experimental results are as follows: Table 1 Performance test data Performance Indicators Comparative Example 1 Example 1 Example 2 Adhesion (Grade) 3B 4B 5B Hardness (pencil hardness) 2H 3H 4H Gloss (60°, GU) 80 88 90 Solvent resistance (double rub times) 50 70 80 As can be seen from Table 1, Examples 1 and 2 are superior to Comparative Example 1 in multiple key performance indicators such as adhesion, hardness, and surface gloss, and show better solvent resistance stability and overall protection performance in actual use, further proving the effectiveness of the multiple optimization processes used in the present invention, such as microgravity pre-adaptation, pulsed electric field pretreatment, femtosecond laser local curing, and customized texture and gloss. It can be seen that the scheme of the present invention is outstanding in both environmental friendliness and performance, and has better industry application prospects.

Claims

1. An environmentally friendly coating production process for automobile interior parts, characterized in that: The following steps are involved: S1, surface pretreatment, apply the cleaning agent evenly to the outside of the substrate, run the brush at 230-500RPM, and maintain a spraying period of 5-15 minutes; after the spraying process, use a clean, fiber-free wiping cloth to remove dirt and let it stand at 35-45℃ for 3-8 minutes to obtain a clean interior part; S2, microgravity pre-adaptation, placing the cleaned interior parts in a centrifuge, setting the rotation speed to 50-100 RPM, and keeping rotating for 10-20 minutes; Obtain interior parts with preliminary microgravity adaptation characteristics; S3, primer coating: applying an environmentally friendly primer to the interior trim having preliminary microgravity adaptation characteristics; Use electrostatic spraying equipment with an electrostatic voltage range of 40-80kV to assist spraying, set the spray gun caliber in the range of 1.2-1.8mm, and maintain the atomization pressure at 0.2-0.4MPa; spray at a distance of 15-25cm from the substrate surface, and level for 5-10min at 20-30℃ to obtain interior parts with primer coating; S4, pulse electric field pretreatment: applying an intermittent pulse electric field to the surface of the interior part coated with primer, with the voltage peak controlled at 2-5 kV and the pulse width set at 1-3 μs; the interval period is maintained at 1-2 ms, so as to obtain a primer coating with optimized stratification; S5, coating; spraying the primer coating which has achieved layer optimization using environmentally friendly color coating; placing the interior parts in a spraying chamber, controlling the flow rate of the spray gun at 50-80 mL / min, and obtaining a coating which has been completed with color spraying.

2. The environmentally friendly coating production process for automobile interior decoration parts according to claim 1 is characterized in that: Also includes: S6, pulse electric field coating; Continuously applying a pulse electric field to the surface of the coating that has been color-sprayed; The peak value of the voltage waveform is adjusted within the range of 1.5-3kV, the pulse repetition frequency is controlled within the range of 200-500Hz, and the action time is 5-10min, thereby obtaining a color coating with improved uniformity; S7, femtosecond laser local curing; the color coating with improved uniformity is locally cured using a femtosecond laser light source; the laser pulse duration can be set in the range of 100-300fs, the single pulse energy is controlled at 0.5-1.0mJ, the scanning speed is maintained at 10-20mm / s, and the action area is concentrated on the corners that are susceptible to wear, so as to obtain a coating that has been completed with laser local curing.

3. The environmentally friendly coating production process for automobile interior decoration parts according to claim 2 is characterized in that: Also includes: S8, customizing texture and gloss; applying a laser engraving process to the coating that has been partially laser-cured, with the wavelength set in the range of 1064-1080nm and the laser power controlled in the range of 5-10W, to obtain a surface with texture and gloss effects; S9, color coating; adding a second layer of environmentally friendly color coating to the surface with texture and gloss effect; applying with an electrostatic spray gun at a voltage range of 60-100 kV, maintaining a spraying distance of 15-25 cm, to obtain a surface that has been completed with secondary color coating.

4. The environmentally friendly coating production process for automobile interior decoration parts according to claim 3 is characterized in that: Also includes: S10, curing and baking; Performing a curing treatment on the surface that has been subjected to the secondary color coating; An oven is selected to heat at 60-80°C for 20-40 minutes, combined with ultraviolet assisted curing with a wavelength in the range of 365-395nm to obtain environmentally friendly coated interior parts with terminal protective performance.

5. The environmentally friendly coating production process for automobile interior decoration parts according to claim 1 is characterized in that: In step S1, the cleaning agent is prepared by mixing anionic surfactant, deionized water, citric acid and isopropyl alcohol in a ratio of 1:90:3:

6.

6. The environmentally friendly coating production process for automobile interior decoration parts according to claim 1 is characterized in that: In step S3, the environmentally friendly primer is prepared by mixing acrylic resin, epoxy resin, ethylenediamine and titanium dioxide in a ratio of 2:1:0.5:

1.

7. The environmentally friendly coating production process for automobile interior decoration parts according to claim 1 is characterized in that: In step S5, the environmentally friendly color coating is prepared by mixing water-based acrylic emulsion, carbonate, leveling agent and ultraviolet absorber UV-0 in a ratio of 5:1:0.5:0.

3.

8. The environmentally friendly coating production process for automobile interior decoration parts according to claim 1 is characterized in that: In step S9, the second layer of environmentally friendly color coating is prepared by mixing water-based acrylic emulsion, copper powder, leveling agent and ultraviolet absorber UV-0 in a ratio of 6:2:0.5:0.3.

Images