Anti-oxidation corrosion-resistant automobile air-inlet grille and electroplating process thereof

Abstract

The invention relates to the technical field of automobile parts, and particularly discloses an anti-oxidation corrosion-resistant automobile air-inlet grille and an electroplating process thereof.The anti-oxidation corrosion-resistant automobile air-inlet grille is prepared from phenoxy-terminated siloxane modified polycarbonate, ABS resin, a modified LDHs antioxidant, a compatilizer ABS-g-MAH and a lubricant ethylene bis stearamide through melt blending, extrusion granulation and injection molding. And a copper layer, a nickel-phosphorus layer and a cobalt-chromium layer are further electroplated and deposited on the automobile air-inlet grille, and the anti-oxidation and corrosion-resistant automobile air-inlet grille is formed.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to an antioxidant and corrosion-resistant automotive air intake grille and its electroplating process. Background Technology

[0002] The car grille is a mesh component located at the front of the vehicle, between the front bumper and the front crossbeam. Its primary functions are heat dissipation and aesthetics. Air is drawn in through the grille openings, providing cooling airflow to the radiator and condenser in the engine compartment, ensuring the engine operates at an optimal temperature. Simultaneously, as the visual center of the front of the car, its design directly impacts the overall aesthetics and brand recognition.

[0003] Traditional automotive grilles are primarily composed of engineering plastics (such as ABS and PC / ABS) and a metal layer on the plastic surface. During use, they are highly susceptible to oxidation and corrosion under complex external conditions, including rusting and peeling of the surface metal layer and aging and brittleness of the plastic matrix. This severely impacts the grille's lifespan and aesthetic appearance. Therefore, developing an automotive grille with excellent oxidation and corrosion resistance to improve its durability in harsh environments, extend its lifespan, and maintain a superior decorative effect is crucial for the high-end development of automotive grilles. Summary of the Invention

[0004] The purpose of this invention is to provide an antioxidant and corrosion-resistant automotive air intake grille and its electroplating process, thereby solving the problems of poor antioxidant and corrosion resistance of automotive air intake grilles.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A manufacturing process for an automotive air intake grille, specifically comprising: Step 1: Using diphenyl carbonate, bisphenol A, and hydroxyl-terminated polydimethylsiloxane as raw materials, phenoxy-terminated siloxane-modified polycarbonate is synthesized. Step 2: Using hydrotalcite, N-(4-aminophenyl)maleimide and 3.6g of pentaerythritol tetrakis(3-mercaptopropionic acid) ester as raw materials, a modified LDH antioxidant was synthesized. Step 3: Mix phenoxy-terminated siloxane-modified polycarbonate, ABS resin, modified LDHs antioxidant, compatibilizer ABS-g-MAH and lubricant vinyl bis-stearamide, granulate by twin-screw extrusion, and injection mold to obtain an automotive air intake grille.

[0006] As a limitation of the present invention, the preparation method of the phenoxy-terminated siloxane modified polycarbonate is as follows: Diphenyl carbonate and bisphenol A were mixed, and 1-butyl-3-methylimidazolium lactate was added as a catalyst under nitrogen protection. The mixture was stirred at 180-190℃ and 300-400 rpm for 2-3 hours. Then, hydroxyl-terminated polydimethylsiloxane was added, and the mixture was stirred for another 1-1.5 hours. Finally, the temperature was raised to 240-250℃, and the mixture was evacuated to 0.8-1 kPa. Diphenyl carbonate was added, and the mixture was stirred for another 0.5-1 hours. After the reaction was completed, the mixture was cooled under nitrogen protection. The product was dissolved in dichloromethane, precipitated in anhydrous ethanol, and dried under vacuum at 70-80℃ for 10-12 hours to obtain phenoxy-terminated siloxane-modified polycarbonate.

[0007] In the presence of the catalyst 1-butyl-3-methylimidazolium lactate, the phenoxy group of diphenyl carbonate undergoes transesterification with the hydroxyl group of bisphenol A, generating phenol and polycarbonate oligomers. Subsequently, the phenoxy group at the end of the polycarbonate oligomer undergoes transesterification with the terminal hydroxyl group of the added terminal hydroxyl polydimethylsiloxane, leading to polymer chain growth and the formation of a PC-PDMS-PC block copolymer. Finally, increasing the reaction temperature and the vacuum level of the reaction system promotes the removal of the transesterification byproduct phenol. Adding diphenyl carbonate allows its phenoxy group to undergo transesterification with the terminal hydroxyl group of the block copolymer, resulting in phenoxy-terminated siloxane-modified polycarbonate. The siloxane segments in this polycarbonate structure are flexible, effectively dispersing and absorbing energy under stress, thus significantly improving the material's toughness and impact resistance. The inherent low intermolecular forces and lubrication effect of the siloxane segments also significantly reduce the viscosity of the polymer melt, improving processing fluidity. The bond energy of silicon-oxygen bonds is higher than that of carbon-carbon bonds, and they are chemically more stable, exhibiting strong inertness to ultraviolet light, ozone, and thermal radiation, thus enhancing the weather resistance of the composite material. The terminal inert phenoxy groups of the copolymer replace the terminal hydroxyl groups, which are prone to thermal degradation and hydrolytic chain reactions, fundamentally blocking the degradation initiation point of the polymer chain and further enhancing the copolymer's thermal stability and hydrolysis resistance.

[0008] As a limitation of the present invention, the initial mass ratio of diphenyl carbonate, bisphenol A, hydroxyl-terminated polydimethylsiloxane, and 1-butyl-3-methylimidazolium lactate is (100-120):(50-70):(5-8):(0.1-0.3); the mass of diphenyl carbonate added is 5-10% of the initial amount of diphenyl carbonate added.

[0009] As a limitation of this invention, the preparation method of the modified LDHs antioxidant is as follows: Hydrotalcite was calcined under vacuum at 500-520℃ for 3-4 hours, cooled, and then added to an ethanol-water solution. The mixture was stirred at 200-300 rpm for 20-30 minutes and ultrasonically dispersed for 5-10 minutes. Silane coupling agent KH-570 and catalyst triethylamine were added, and the reaction was carried out under nitrogen protection at 60-70℃ and 300-400 rpm for 8-12 hours. After the reaction was completed, the mixture was filtered, washed with ethanol and deionized water, and vacuum dried at 60-70℃ for 4-6 hours to obtain KH-570 modified LDHs. N-(4-aminophenyl)maleimide was added to tetrahydrofuran and stirred at 200-300 rpm for 20-30 min to obtain an imide solution. Pentaerythritol tetrakis(3-mercaptopropionic acid) and triethylamine catalyst were added to tetrahydrofuran and stirred at 200-300 rpm for 20-30 min. The mixture was then ultrasonically dispersed for 5-10 min. The imide solution was added, and the mixture was stirred at 300-400 rpm for 2-3 h under nitrogen protection at 60-70 °C. KH-570 modified LDHs were added, and the mixture was stirred for another 8-12 h. After the reaction was completed, the mixture was cooled, filtered, washed with tetrahydrofuran, and vacuum dried at 60-70 °C for 10-12 h to obtain the modified LDHs antioxidant.

[0010] After calcination and activation, the active hydroxyl groups of hydrotalcite undergo a condensation reaction with the silanol groups hydrolyzed by the silane coupling agent KH-570, forming covalent bonds to generate KH-570 modified hydrotalcite. The carbon-carbon double bond of N-(4-aminophenyl)maleimide and the mercapto group of pentaerythritol tetrakis(3-mercaptopropionic acid) ester undergo a mercapto-alkene click reaction under the catalysis of triethylamine, generating a macromolecular antioxidant with a thioether bond structure. At this time, the surface of the added KH-570 modified hydrotalcite also contains double bonds participating in the reaction. The macromolecular antioxidant is grafted onto the hydrotalcite through thioether bonds to form a modified hydrotalcite antioxidant. Hydrotalcite, with its layered structure, physically blocks the penetration of oxygen and ultraviolet light, delaying the aging of composite materials. Simultaneously, the benzene and imide rings in the grafted antioxidant N-(4-aminophenyl)maleimide structure are strong ultraviolet absorbing groups, absorbing ultraviolet light and preventing photodegradation of the composite material. Furthermore, the thioether bonds in the structure actively capture free radicals (ROO·) generated during polymer degradation, oxidizing themselves into sulfoxides or sulfones, thus protecting the polymer backbone structure. These three elements work synergistically to enhance the weather resistance of the composite material. Because the antioxidant is chemically grafted onto the hydrotalcite, it is less prone to migration and volatilization during subsequent processing and use, extending the UV oxidation resistance life of the composite material.

[0011] As a limitation of the present invention, the mass ratio of the hydrotalcite, silane coupling agent KH-570 and triethylamine is (10-15):(2-3):(0.8-1.2); the mass ratio of N-(4-aminophenyl)maleimide, pentaerythritol tetrakis(3-mercaptopropionic acid) ester, KH-570 modified LDHs and triethylamine is (3.2-4.2):(3.6-4.6):(5-7):(0.5-0.7).

[0012] As a limitation of the present invention, the automotive air intake grille, by mass fraction, comprises: 55-65 wt% phenoxy-terminated siloxane modified polycarbonate, 8-10 wt% modified LDHs antioxidant, 5-7 wt% compatibilizer ABS-g-MAH, 0.5-1 wt% lubricant vinyl bis-stearamide, and the balance being ABS resin; the process conditions for twin-screw extrusion include: melt temperature of 240-250°C, screw speed of 200-300 rpm, and extrusion temperature of 230-240°C.

[0013] An electroplating process for an antioxidant and corrosion-resistant automotive air intake grille, wherein the automotive air intake grille is prepared using any of the above-described manufacturing processes, specifically: S1. Plasma etching roughens the surface of the car's air intake grille to obtain a roughened car air intake grille; S2. The roughened car air intake grille is immersed in a conductive dispersion for adsorption. After adsorption, it is washed with deionized water and vacuum dried to obtain a conductive car air intake grille. S3. Conductive automotive air intake grilles are electroplated in acidic copper plating solution to obtain copper-plated automotive air intake grilles. S4. Copper-plated automotive air intake grilles are electroplated in nickel-phosphorus electroplating solutions to obtain nickel-phosphorus automotive air intake grilles. S5, nickel-phosphorus automotive air intake grilles are electroplated in cobalt-chromium electroplating solution to obtain antioxidant and corrosion-resistant automotive air intake grilles.

[0014] The acidic copper plating solution contains: 220-240 g / L copper sulfate pentahydrate, 60-80 g / L concentrated sulfuric acid, 0.08-0.1 g / L hydrochloric acid, 0.5-1.0 g / L polyethylene glycol, 0.02-0.05 g / L sodium polydisulfide dipropane sulfonate, and 0.1-0.3 g / L cerium nitrate.

[0015] The nickel-phosphorus electroplating solution contains: 300-320 g / L nickel sulfamate, 40-60 g / L nickel chloride, 40-60 g / L boric acid, 10-20 g / L sodium hypophosphite, 0.5-1.0 g / L sodium saccharin, and 20-30 g / L KH-550 modified nano silicon carbide.

[0016] The cobalt-chromium electroplating solution contains: 250-270 g / L chromium anhydride, 2.5-4.5 g / L sulfuric acid, 2.0-4.0 g / L cobalt sulfate heptahydrate, and 1.5-3.5 g / L potassium fluorosilicate.

[0017] As a limitation of the present invention, the process conditions for plasma etching roughening in S1 include: argon flow rate of 100-120 sccm, oxygen flow rate of 30-50 sccm, power supply of 800-1000W, rotation speed of 10-20 rpm, and processing time of 3-5 min.

[0018] As a limitation of the present invention, in S2, the conductive dispersion comprises: 1.6-2.0 g / L dopamine hydrochloride, 0.4-0.8 g / L graphene oxide and 0.2-0.4 g / L silver nanowires, and the solvent is deionized water and anhydrous ethanol in a volume ratio of (4-5):1.

[0019] During the polymerization of dopamine hydrochloride, graphene oxide and silver nanowires are fixed by polydopamine molecular chains. Polydopamine forms a tough and dense bottom film on the activated plastic surface, firmly fixing the conductive components to the substrate. Graphene oxide provides surface contact, and silver nanowires provide linear connections to form a continuous, interwoven three-dimensional conductive network structure on the grid surface, uniformly conducting current and providing electronic channels for subsequent electroplating. This replaces the conductive layer formed by the traditional process relying on the precious metal palladium catalyzed chemical plating, avoiding the use of toxic and expensive palladium salts for activation and chemical plating processes.

[0020] As a limitation of the present invention, in step S3, the electroplating process conditions include: a current density of 3-5 A / dm³. 2 The frequency is 800-1000Hz, the duty cycle is 20-30%, the electroplating temperature is 25-30℃, and the electroplating time is 25-35min; in S4, the electroplating process conditions include: current density of 4-6A / dm³. 2 The electroplating temperature is 50-60℃, the electroplating time is 20-30 min, and stirring is maintained at 80-100 rpm during the electroplating process; in S5, the electroplating process conditions include: current density of 15-20 A / dm³. 2 The electroplating temperature is 55-65℃ and the electroplating time is 5-10min; the copper layer formed by electroplating in S3 is 15-20μm thick; the nickel-phosphorus layer formed by electroplating in S4 is 10-15μm thick; and the cobalt-chromium layer formed by electroplating in S5 is 1-2μm thick.

[0021] A pulse electroplating method is used to deposit a copper layer on a conductive automotive grille. The electroplating solution contains cerium, which refines the copper grains, forming a microcrystalline copper layer. This creates a uniform conductive metallic layer on the grille, enhancing the bond strength between the grille and subsequent plating layers. It also provides an excellent current distribution foundation for subsequent high-current, high-efficiency electroplating processes. This copper layer also exhibits excellent ductility and flowability, filling any microscopic unevenness that may exist in the conductive coating. It provides an extremely smooth and dense substrate for subsequent plating layers, while reducing the microscopic porosity of the grille surface, blocking the penetration path of corrosive media, and improving the corrosion resistance of the composite material. This copper layer also acts as a buffer between the plastic substrate and subsequent metal plating layers, absorbing and dispersing interfacial stress caused by thermal expansion and contraction, preventing blistering and cracking of the plating layer due to excessive stress.

[0022] Under the influence of an electric current, nickel ions are reduced to metallic nickel on the surface of a copper-plated automotive grille. Simultaneously, hypophosphite ions undergo nickel-catalyzed decomposition on the nickel surface, generating elemental phosphorus which co-deposits with nickel to form an amorphous nickel-phosphorus layer. Meanwhile, under stirring, KH-550 modified nano-silicon carbide particles are carried to the cathode surface by the flowing plating solution and encapsulated by the growing nickel-phosphorus matrix, thus embedding themselves in the plating layer and forming a nickel-phosphorus layer containing silicon carbide. The amorphous nickel-phosphorus layer has a uniform structure, no grain boundaries, and homogeneous chemical properties, making it an excellent corrosion barrier. Its corrosion resistance is superior to that of ordinary crystalline nickel. The nano-silicon carbide particles, as a hard dispersed phase, significantly improve the hardness, wear resistance, and scratch resistance of the plating layer. The nickel-phosphorus layer, situated between the negatively charged copper layer and the highly positively charged chromium layer, forms an electrochemical transition, enhancing the corrosion resistance of the plating layer.

[0023] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes phenoxy-terminated siloxanes to modify polycarbonate, enhancing the material's toughness and impact resistance, improving processing fluidity, and strengthening the composite material's weather resistance. An antioxidant structure is introduced into the surface of hydrotalcite, whose layered structure physically blocks oxygen and ultraviolet light penetration, delaying the aging of the composite material. The antioxidant structure protects the polymer backbone structure through ultraviolet absorption and free radical scavenging; these three elements work synergistically to enhance the composite material's weather resistance. Simultaneously, the antioxidant is chemically grafted onto the hydrotalcite, making it less prone to migration and volatilization during subsequent processing and use, thus extending the composite material's UV oxidation resistance lifespan.

[0024] This invention employs plasma etching technology to roughen the automotive air intake grille and construct a conductive coating on the roughened surface. This coating uniformly conducts current, providing an electron channel for subsequent electroplating. It replaces the traditional process that relies on palladium-catalyzed electroless plating to form a conductive layer, avoiding the use of toxic and expensive palladium salts for activation and electroless plating. A copper layer, a nickel-phosphorus layer, and a cobalt-chromium layer are sequentially deposited on the conductive automotive grille. The copper layer, with its excellent ductility and fluidity, can fill any microscopic unevenness that may exist in the conductive coating, providing an extremely smooth and dense substrate for subsequent plating layers. Simultaneously, it reduces the microscopic porosity of the automotive air intake grille surface, blocking the penetration path of corrosive media and improving the corrosion resistance of the composite material. The nickel-phosphorus layer contains silicon carbide. The amorphous nickel-phosphorus layer has a uniform structure, no grain boundaries, and uniform chemical properties, making it an excellent corrosion barrier. Its corrosion resistance is superior to that of ordinary crystalline nickel. Nanoscale silicon carbide particles, as a hard dispersed phase, significantly improve the hardness, wear resistance, and scratch resistance of the coating. The cobalt-chromium layer, as the final surface layer, provides high hardness, high wear resistance, and excellent decorative appearance. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Hydroxyl-terminated polydimethylsiloxane (Mn=10000), hydrotalcite (specific surface area 2m²) 2 / g: Particle size: 1.0μm), ABS resin (Mn=80000), compatibilizer ABS-g-MAH (Mn=80000, grafting rate: 1.0wt%), graphene oxide (particle size: 2.0μm), silver nanowires (length: 10μm, diameter: 40nm), phosphor bronze plate (phosphorus content: 0.05wt%), nickel plate (purity: 99.99%), lead-tin alloy plate (tin content: 60wt%).

[0027] The preparation method of acidic copper electroplating solution is as follows: Add 220g copper sulfate pentahydrate, 60g concentrated sulfuric acid, 0.08g hydrochloric acid, 0.5g polyethylene glycol, 0.02g sodium polydithiopropane sulfonate, and 0.1g cerium nitrate to 800mL of deionized water, stir well, and then dilute to 1L with deionized water. Sonicate for 10min to obtain an acidic copper electroplating solution.

[0028] The preparation method of nickel-phosphorus electroplating solution is as follows: Add 10g of nano-silicon carbide to 100mL of ethanol aqueous solution (v 乙醇 :v 水In a mixture of 9:1, the mixture was stirred at 200 rpm for 20 min, ultrasonically dispersed for 5 min, 2 g of silane coupling agent KH-550 was added, the pH was adjusted to 5, and the mixture was reacted at 60℃ and 400 rpm for 6 h. After the reaction was completed, the mixture was cooled and filtered, washed with ethanol and deionized water, and vacuum dried at 80℃ for 6 h to obtain KH-550 modified nano-silicon carbide. Add 300g nickel aminosulfonate, 40g nickel chloride, and 40g boric acid to 800mL of deionized water, stir well, then add 10g sodium hypophosphite, 0.5g sodium saccharin, and 20g KH-550 modified nano silicon carbide. Make up the volume to 1L with deionized water, and ultrasonically disperse for 20min to obtain nickel-phosphorus electroplating solution.

[0029] The preparation method of cobalt-chromium electroplating solution is as follows: Add 250g of chromium anhydride, 2.5g of sulfuric acid, 2.0g of cobalt sulfate heptahydrate and 1.5g of potassium fluorosilicate to 800mL of deionized water, stir well, and then make up to 1L with deionized water. Disperse by ultrasonication for 10min to obtain cobalt-chromium electroplating solution.

[0030] Example 1: An antioxidant and corrosion-resistant automotive air intake grille and its electroplating process, specifically: Step 1: Mix 100g of diphenyl carbonate and 50g of bisphenol A. Under nitrogen protection, add 0.1g of catalyst 1-butyl-3-methylimidazolium lactate and stir at 180℃ and 400rpm for 2h. Then add 5g of hydroxyl-terminated polydimethylsiloxane and continue stirring for 1h. Finally, raise the temperature to 240℃, evacuate to 1KPa, add 10g of diphenyl carbonate, and continue stirring for 1h. After the reaction is complete, cool under nitrogen protection. Dissolve the product in dichloromethane, precipitate it in anhydrous ethanol, and dry it under vacuum at 80℃ for 12h to obtain phenoxy-terminated siloxane-modified polycarbonate. Step 2: 10g of hydrotalcite was calcined at 500℃ under vacuum for 4h, cooled and added to 100mL of ethanol-water solution with a volume ratio of 1:1. The mixture was stirred at 200rpm for 20min and ultrasonically dispersed for 10min. 2g of silane coupling agent KH-570 and 0.8g of catalyst triethylamine were added. The mixture was stirred at 60℃ and 400rpm for 12h under nitrogen protection. After the reaction was completed, the mixture was filtered, washed with ethanol and deionized water, and dried under vacuum at 60℃ for 6h to obtain KH-570 modified LDHs. Step 3: Add 3.2g of N-(4-aminophenyl)maleimide to 100mL of tetrahydrofuran and stir at 200rpm for 20min to obtain an imide solution. Add 3.6g of pentaerythritol tetrakis(3-mercaptopropionic acid) and 0.5g of triethylamine catalyst to 100mL of tetrahydrofuran and stir at 200rpm for 20min. Sonicate the mixture for 10min and add the imide solution. Under nitrogen protection, stir at 60℃ and 400rpm for 2h. Add 5g of KH-570 modified LDHs and continue stirring for 12h. After the reaction is complete, cool, filter, wash with tetrahydrofuran, and vacuum dry at 60℃ for 12h to obtain modified LDHs antioxidant. Step 4: Add 55g of phenoxy-terminated siloxane-modified polycarbonate, 31.5g of ABS resin, 8g of modified LDHs antioxidant, 5g of compatibilizer ABS-g-MAH, and 0.5g of lubricant vinyl bis-stearamide to a high-speed mixer. Mix at 600 rpm for 5 minutes, then feed the mixture into a twin-screw extruder for granulation. Set the melt temperature to 250℃, the screw speed to 300 rpm, and the extrusion temperature to 240℃. Injection mold the resulting granules to obtain an automotive air intake grille. Step 5: S1. Place the car air intake grille into a rotary plasma processing device for plasma etching, evacuate to 10Pa, introduce argon and oxygen, set the argon flow rate to 100sccm, the oxygen flow rate to 30sccm, the power to 800W, the rotation speed to 10rpm, and the processing time to 5min to obtain a roughened car air intake grille. S2. Add 0.4g of dopamine hydrochloride to 200mL of deionized water and stir at 200rpm for 20min to obtain a dopamine hydrochloride solution. Add 0.1g of graphene oxide and 0.05g of silver nanowires to 50mL of anhydrous ethanol and sonicate for 10min. Add the dopamine hydrochloride solution and stir evenly to obtain a conductive dispersion. Immerse the roughened car air intake grille in the conductive dispersion and stir at 100rpm for 4h at 40℃. After adsorption, wash with deionized water and vacuum dry at 60℃ for 2h to obtain a conductive car air intake grille. S3. Place the conductive automotive air intake grille in an acidic copper electroplating solution as the cathode, and a phosphor bronze plate as the anode, setting the current density to 3A / dm³. 2 The pulse frequency is 1000Hz, the duty cycle is 30%, the electroplating temperature is 25℃, and the electroplating time is 25min, forming a 15μm thick copper layer to obtain a copper-plated car air intake grille. S4. Place the copper-plated automotive air intake grille in a nickel-phosphorus electroplating solution as the cathode, with a nickel plate as the anode, and set the current density to 4 A / dm³. 2The electroplating temperature was 55℃, the electroplating time was 20min, and the stirring was maintained at 80rpm during the electroplating process to form a 10μm thick nickel-phosphorus layer, thus obtaining a nickel-phosphorus plated car air intake grille. S5. Place the nickel-phosphorus plated automotive air intake grille into a cobalt-chromium electroplating solution as the cathode, and use a lead-tin alloy plate as the anode, setting the current density to 20A / dm³. 2 The electroplating temperature is 55℃ and the electroplating time is 5min to form a 1μm thick cobalt-chromium layer, resulting in an anti-oxidation and corrosion-resistant automotive air intake grille.

[0031] Example 2: An antioxidant and corrosion-resistant automotive air intake grille and its electroplating process, specifically: Step 1: Mix 110g of diphenyl carbonate and 60g of bisphenol A. Under nitrogen protection, add 0.1g of catalyst 1-butyl-3-methylimidazolium lactate and stir at 180℃ and 400rpm for 2h. Then add 5g of hydroxyl-terminated polydimethylsiloxane and continue stirring for 1h. Finally, raise the temperature to 240℃, evacuate to 1KPa, add 10g of diphenyl carbonate and continue stirring for 1h. After the reaction is complete, cool under nitrogen protection. Dissolve the product in dichloromethane, precipitate it in anhydrous ethanol, and dry it under vacuum at 80℃ for 12h to obtain phenoxy-terminated siloxane-modified polycarbonate. Step 2: 10g of hydrotalcite was calcined at 500℃ under vacuum for 4h, cooled, and then added to 100mL of ethanol-water solution with a volume ratio of 1:1. The mixture was stirred at 200rpm for 20min, ultrasonically dispersed for 10min, and then 2.5g of silane coupling agent KH-570 and 0.8g of catalyst triethylamine were added. The mixture was stirred at 60℃ and 400rpm for 12h under nitrogen protection. After the reaction was completed, the mixture was filtered, washed with ethanol and deionized water, and dried under vacuum at 60℃ for 6h to obtain KH-570 modified LDHs. Step 3: Add 3.5g of N-(4-aminophenyl)maleimide to 100mL of tetrahydrofuran and stir at 200rpm for 20min to obtain an imide solution. Add 4.0g of pentaerythritol tetrakis(3-mercaptopropionic acid) and 0.5g of triethylamine catalyst to 100mL of tetrahydrofuran and stir at 200rpm for 20min. Sonicate the mixture for 10min, add the imide solution, and react under nitrogen protection at 60℃ and 400rpm for 2h. Add 5g of KH-570 modified LDHs and continue stirring for 12h. After the reaction is complete, cool, filter, wash with tetrahydrofuran, and vacuum dry at 60℃ for 12h to obtain modified LDHs antioxidant. Step 4: Add 58g of phenoxy-terminated siloxane-modified polycarbonate, 26.5g of ABS resin, 9g of modified LDHs antioxidant, 6g of compatibilizer ABS-g-MAH, and 0.5g of lubricant vinyl bis-stearamide to a high-speed mixer. Mix at 600 rpm for 5 minutes, then feed the mixture into a twin-screw extruder for granulation. Set the melt temperature to 250℃, the screw speed to 300 rpm, and the extrusion temperature to 240℃. Injection mold the resulting granules to obtain an automotive air intake grille. Step 5: S1. Place the car air intake grille into a rotary plasma processing device for plasma etching, evacuate to 10Pa, introduce argon and oxygen, set the argon flow rate to 100sccm, the oxygen flow rate to 30sccm, the power to 800W, the rotation speed to 10rpm, and the processing time to 5min to obtain a roughened car air intake grille. S2. Add 0.4g of dopamine hydrochloride to 200mL of deionized water and stir at 200rpm for 20min to obtain a dopamine hydrochloride solution. Add 0.1g of graphene oxide and 0.05g of silver nanowires to 50mL of anhydrous ethanol and sonicate for 10min. Add the dopamine hydrochloride solution and stir evenly to obtain a conductive dispersion. Immerse the roughened car air intake grille in the conductive dispersion and stir at 100rpm for 4h at 40℃. After adsorption, wash with deionized water and vacuum dry at 60℃ for 2h to obtain a conductive car air intake grille. S3. Place the conductive automotive air intake grille in an acidic copper electroplating solution as the cathode, and a phosphor bronze plate as the anode, setting the current density to 3A / dm³. 2 The pulse frequency is 1000Hz, the duty cycle is 30%, the electroplating temperature is 25℃, and the electroplating time is 30min, forming a 17μm thick copper layer to obtain a copper-plated car air intake grille. S4. Place the copper-plated automotive air intake grille into the nickel-phosphorus electroplating solution as the cathode, with the nickel plate as the anode, and set the current density to 4A / dm³. 2 The electroplating temperature was 55℃, the electroplating time was 25min, and the stirring was maintained at 80rpm during the electroplating process to form a 13μm thick nickel-phosphorus layer, thus obtaining a nickel-phosphorus plated car air intake grille. S5. Place the nickel-phosphorus plated automotive air intake grille into a cobalt-chromium electroplating solution as the cathode, and use a lead-tin alloy plate as the anode, setting the current density to 20A / dm³. 2 The electroplating temperature is 55℃ and the electroplating time is 5min to form a 1μm thick cobalt-chromium layer, resulting in an anti-oxidation and corrosion-resistant automotive air intake grille.

[0032] Example 3: An antioxidant and corrosion-resistant automotive air intake grille and its electroplating process, specifically: Step 1: Mix 120g of diphenyl carbonate and 70g of bisphenol A. Under nitrogen protection, add 0.1g of catalyst 1-butyl-3-methylimidazolium lactate and stir at 180℃ and 400rpm for 2h. Then add 5g of hydroxyl-terminated polydimethylsiloxane and continue stirring for 1h. Finally, raise the temperature to 240℃, evacuate to 1KPa, add 10g of diphenyl carbonate, and continue stirring for 1h. After the reaction is complete, cool under nitrogen protection. Dissolve the product in dichloromethane, precipitate it in anhydrous ethanol, and dry it under vacuum at 80℃ for 12h to obtain phenoxy-terminated siloxane-modified polycarbonate. Step 2: 10g of hydrotalcite was calcined at 500℃ under vacuum for 4h, cooled and added to 100mL of ethanol-water solution with a volume ratio of 1:1. The mixture was stirred at 200rpm for 20min and ultrasonically dispersed for 10min. 3g of silane coupling agent KH-570 and 0.8g of catalyst triethylamine were added. The mixture was stirred at 60℃ and 400rpm for 12h under nitrogen protection. After the reaction was completed, the mixture was filtered, washed with ethanol and deionized water, and dried under vacuum at 60℃ for 6h to obtain KH-570 modified LDHs. Step 3: Add 4.2g of N-(4-aminophenyl)maleimide to 100mL of tetrahydrofuran and stir at 200rpm for 20min to obtain an imide solution. Add 4.6g of pentaerythritol tetrakis(3-mercaptopropionic acid) and 0.5g of triethylamine catalyst to 100mL of tetrahydrofuran and stir at 200rpm for 20min. Sonicate the mixture for 10min, add the imide solution, and react under nitrogen protection at 60℃ and 400rpm for 2h. Add 5g of KH-570 modified LDHs and continue stirring for 12h. After the reaction is complete, cool, filter, wash with tetrahydrofuran, and vacuum dry at 60℃ for 12h to obtain modified LDHs antioxidant. Step 4: Add 60g of phenoxy-terminated siloxane-modified polycarbonate, 22g of ABS resin, 10g of modified LDHs antioxidant, 7g of compatibilizer ABS-g-MAH, and 1g of lubricant vinyl bis-stearamide to a high-speed mixer. Mix at 600 rpm for 5 minutes, then feed the mixture into a twin-screw extruder for granulation. Set the melt temperature to 250℃, the screw speed to 300 rpm, and the extrusion temperature to 240℃. Injection mold the resulting granules to obtain an automotive air intake grille. Step 5: S1. Place the car air intake grille into a rotary plasma processing device for plasma etching, evacuate to 10Pa, introduce argon and oxygen, set the argon flow rate to 100sccm, the oxygen flow rate to 30sccm, the power to 800W, the rotation speed to 10rpm, and the processing time to 5min to obtain a roughened car air intake grille. S2. Add 0.4g of dopamine hydrochloride to 200mL of deionized water and stir at 200rpm for 20min to obtain a dopamine hydrochloride solution. Add 0.1g of graphene oxide and 0.05g of silver nanowires to 50mL of anhydrous ethanol and sonicate for 10min. Add the dopamine hydrochloride solution and stir evenly to obtain a conductive dispersion. Immerse the roughened car air intake grille in the conductive dispersion and stir at 100rpm for 4h at 40℃. After adsorption, wash with deionized water and vacuum dry at 60℃ for 2h to obtain a conductive car air intake grille. S3. Place the conductive automotive air intake grille in an acidic copper electroplating solution as the cathode, and a phosphor bronze plate as the anode, setting the current density to 3A / dm³. 2 The pulse frequency is 1000Hz, the duty cycle is 30%, the electroplating temperature is 25℃, and the electroplating time is 35min, forming a 20μm thick copper layer to obtain a copper-plated car air intake grille. S4. Place the copper-plated automotive air intake grille in a nickel-phosphorus electroplating solution as the cathode, with a nickel plate as the anode, and set the current density to 4 A / dm³. 2 The electroplating temperature was 55℃, the electroplating time was 30min, and the stirring was maintained at 80rpm during the electroplating process to form a 15μm thick nickel-phosphorus layer, thus obtaining a nickel-phosphorus plated car air intake grille. S5. Place the nickel-phosphorus plated automotive air intake grille into a cobalt-chromium electroplating solution as the cathode, and use a lead-tin alloy plate as the anode, setting the current density to 20A / dm³. 2 The electroplating temperature is 55℃ and the electroplating time is 5min to form a 1μm thick cobalt-chromium layer, resulting in an anti-oxidation and corrosion-resistant automotive air intake grille.

[0033] Based on Example 1, the following comparative experiments were conducted, specifically Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5, as described below: Comparative Example 1: This comparative example relates to an antioxidant and corrosion-resistant automotive air intake grille and its electroplating process. The difference from Example 1 is that the polycarbonate in the air intake grille is not modified. Specifically: Step 1: 10g of hydrotalcite was calcined at 500℃ under vacuum for 4h. After cooling, it was added to 100mL of ethanol-water solution with a volume ratio of 1:1. The mixture was stirred at 200rpm for 20min and ultrasonically dispersed for 10min. 2g of silane coupling agent KH-570 and 0.8g of catalyst triethylamine were added. The mixture was stirred at 60℃ and 400rpm for 12h under nitrogen protection. After the reaction was completed, the mixture was filtered, washed with ethanol and deionized water, and dried under vacuum at 60℃ for 6h to obtain KH-570 modified LDHs. Step 2: Add 3.2g of N-(4-aminophenyl)maleimide to 100mL of tetrahydrofuran and stir at 200rpm for 20min to obtain an imide solution. Add 3.6g of pentaerythritol tetrakis(3-mercaptopropionic acid) and 0.5g of triethylamine catalyst to 100mL of tetrahydrofuran and stir at 200rpm for 20min. Sonicate the mixture for 10min, add the imide solution, and react under nitrogen protection at 60℃ and 400rpm for 2h. Add 5g of KH-570 modified LDHs and continue stirring for 12h. After the reaction is complete, cool, filter, wash with tetrahydrofuran, and vacuum dry at 60℃ for 12h to obtain modified LDHs antioxidant. Step 3: Add 55g polycarbonate, 31.5g ABS resin, 8g modified LDHs antioxidant, 5g compatibilizer ABS-g-MAH, and 0.5g lubricant vinyl bis-stearamide to a high-speed mixer and mix at 600rpm for 5 minutes. Then, feed the mixture into a twin-screw extruder for granulation. Set the melt temperature to 250℃, the screw speed to 300rpm, and the extrusion temperature to 240℃. Injection mold the resulting granules to obtain an automotive air intake grille. The process conditions for electroplating the surface of the car air intake grille to form an anti-oxidation and corrosion-resistant car air intake grille are the same as those in Example 1.

[0034] Comparative Example 2: This comparative example relates to an antioxidant and corrosion-resistant automotive air intake grille and its electroplating process. The difference from Example 1 is that the surface of the hydrotalcite in the air intake grille is not grafted with an antioxidant. Specifically: Step 1: Mix 100g of diphenyl carbonate and 50g of bisphenol A. Under nitrogen protection, add 0.1g of catalyst 1-butyl-3-methylimidazolium lactate and stir at 180℃ and 400rpm for 2h. Then add 5g of hydroxyl-terminated polydimethylsiloxane and continue stirring for 1h. Finally, raise the temperature to 240℃, evacuate to 1KPa, add 10g of diphenyl carbonate, and continue stirring for 1h. After the reaction is complete, cool under nitrogen protection. Dissolve the product in dichloromethane, precipitate it in anhydrous ethanol, and dry it under vacuum at 80℃ for 12h to obtain phenoxy-terminated siloxane-modified polycarbonate. Step 2: 10g of hydrotalcite was calcined at 500℃ under vacuum for 4h, cooled and added to 100mL of ethanol-water solution with a volume ratio of 1:1. The mixture was stirred at 200rpm for 20min and ultrasonically dispersed for 10min. 2g of silane coupling agent KH-570 and 0.8g of catalyst triethylamine were added. The mixture was stirred at 60℃ and 400rpm for 12h under nitrogen protection. After the reaction was completed, the mixture was filtered, washed with ethanol and deionized water, and dried under vacuum at 60℃ for 6h to obtain KH-570 modified LDHs. Step 3: Add 55g of phenoxy-terminated siloxane-modified polycarbonate, 31.5g of ABS resin, 8g of KH-570 modified LDHs, 5g of compatibilizer ABS-g-MAH, and 0.5g of lubricant vinyl bis-stearamide to a high-speed mixer. Mix at 600 rpm for 5 minutes, then feed the mixture into a twin-screw extruder for granulation. Set the melt temperature to 250℃, the screw speed to 300 rpm, and the extrusion temperature to 240℃. Injection mold the resulting granules to obtain an automotive air intake grille. The process conditions for electroplating the surface of the car air intake grille to form an anti-oxidation and corrosion-resistant car air intake grille are the same as those in Example 1.

[0035] Comparative Example 3: This comparative example relates to an antioxidant and corrosion-resistant automotive air intake grille and its electroplating process. The difference from Example 1 is that a macromolecular antioxidant is directly added to the automotive grille, specifically: Step 1: Mix 100g of diphenyl carbonate and 50g of bisphenol A. Under nitrogen protection, add 0.1g of catalyst 1-butyl-3-methylimidazolium lactate and stir at 180℃ and 400rpm for 2h. Then add 5g of hydroxyl-terminated polydimethylsiloxane and continue stirring for 1h. Finally, raise the temperature to 240℃, evacuate to 1KPa, add 10g of diphenyl carbonate, and continue stirring for 1h. After the reaction is complete, cool under nitrogen protection. Dissolve the product in dichloromethane, precipitate it in anhydrous ethanol, and dry it under vacuum at 80℃ for 12h to obtain phenoxy-terminated siloxane-modified polycarbonate. Step 2: Add 3.2g of N-(4-aminophenyl)maleimide to 100mL of tetrahydrofuran, stir at 200rpm for 20min to obtain an imide solution. Add 3.6g of pentaerythritol tetrakis(3-mercaptopropionic acid) and 0.5g of triethylamine catalyst to 100mL of tetrahydrofuran, stir at 200rpm for 20min, sonicate for 10min, add the imide solution, and react under nitrogen protection at 60℃ and 400rpm for 2h. After the reaction is complete, cool, filter, wash with tetrahydrofuran, and vacuum dry at 60℃ for 12h to obtain a macromolecular antioxidant. Step 3: Add 55g of phenoxy-terminated siloxane-modified polycarbonate, 31.5g of ABS resin, 8g of macromolecular antioxidant, 5g of compatibilizer ABS-g-MAH, and 0.5g of lubricant vinyl bis-stearamide to a high-speed mixer. Mix at 600 rpm for 5 minutes, then feed the mixture into a twin-screw extruder for granulation. Set the melt temperature to 250℃, the screw speed to 300 rpm, and the extrusion temperature to 240℃. Injection mold the resulting granules to obtain an automotive air intake grille. The process conditions for electroplating the surface of the car air intake grille to form an anti-oxidation and corrosion-resistant car air intake grille are the same as those in Example 1.

[0036] Comparative Example 4: This comparative example relates to an antioxidant and corrosion-resistant automotive air intake grille and its electroplating process. The difference from Example 1 is that a nickel-phosphorus layer was not electroplated. Specifically: The manufacturing process of the car's air intake grille is the same as in Example 1; Step 2: S1. Place the car air intake grille into a rotary plasma processing device for plasma etching, evacuate to 10Pa, introduce argon and oxygen, set the argon flow rate to 100sccm, the oxygen flow rate to 30sccm, the power to 800W, the rotation speed to 10rpm, and the processing time to 5min to obtain a roughened car air intake grille. S2. Add 0.4g of dopamine hydrochloride to 200mL of deionized water and stir at 200rpm for 20min to obtain a dopamine hydrochloride solution. Add 0.1g of graphene oxide and 0.05g of silver nanowires to 50mL of anhydrous ethanol and sonicate for 10min. Add the dopamine hydrochloride solution and stir evenly to obtain a conductive dispersion. Immerse the roughened car air intake grille in the conductive dispersion and stir at 100rpm for 4h at 40℃. After adsorption, wash with deionized water and vacuum dry at 60℃ for 2h to obtain a conductive car air intake grille. S3. Place the conductive automotive air intake grille in an acidic copper electroplating solution as the cathode, and a phosphor bronze plate as the anode, setting the current density to 3A / dm³. 2 The pulse frequency is 1000Hz, the duty cycle is 30%, the electroplating temperature is 25℃, and the electroplating time is 25min, forming a 15μm thick copper layer to obtain a copper-plated car air intake grille. S4. Place the copper-plated automotive air intake grille in a cobalt-chromium electroplating solution as the cathode, and use a lead-tin alloy plate as the anode, setting the current density to 20A / dm². 2 The electroplating temperature is 55℃ and the electroplating time is 5min to form a 1μm thick cobalt-chromium layer, resulting in an anti-oxidation and corrosion-resistant automotive air intake grille.

[0037] Comparative Example 5: This comparative example relates to an antioxidant and corrosion-resistant automotive air intake grille and its electroplating process. The difference from Example 1 is that a cobalt-chromium layer is not electroplated. Specifically: The manufacturing process of the car's air intake grille is the same as in Example 1; Step 2: S1. Place the car air intake grille into a rotary plasma processing device for plasma etching, evacuate to 10Pa, introduce argon and oxygen, set the argon flow rate to 100sccm, the oxygen flow rate to 30sccm, the power to 800W, the rotation speed to 10rpm, and the processing time to 5min to obtain a roughened car air intake grille. S2. Add 0.4g of dopamine hydrochloride to 200mL of deionized water and stir at 200rpm for 20min to obtain a dopamine hydrochloride solution. Add 0.1g of graphene oxide and 0.05g of silver nanowires to 50mL of anhydrous ethanol and sonicate for 10min. Add the dopamine hydrochloride solution and stir evenly to obtain a conductive dispersion. Immerse the roughened car air intake grille in the conductive dispersion and stir at 100rpm for 4h at 40℃. After adsorption, wash with deionized water and vacuum dry at 60℃ for 2h to obtain a conductive car air intake grille. S3. Place the conductive automotive air intake grille in an acidic copper electroplating solution as the cathode, and a phosphor bronze plate as the anode, setting the current density to 3A / dm³. 2 The pulse frequency is 1000Hz, the duty cycle is 30%, the electroplating temperature is 25℃, and the electroplating time is 25min, forming a 15μm thick copper layer to obtain a copper-plated car air intake grille. S4. Place the copper-plated automotive air intake grille in a nickel-phosphorus electroplating solution as the cathode, with a nickel plate as the anode, and set the current density to 4 A / dm³. 2 The electroplating temperature is 55℃, the electroplating time is 20min, and the stirring is maintained at 80rpm during the electroplating process to form a 10μm thick nickel-phosphorus layer, thus obtaining an antioxidant and corrosion-resistant automotive air intake grille.

[0038] Testing experiment: Antioxidant and corrosion-resistant automotive air intake grilles were manufactured according to the processes in each embodiment and comparative example as test samples, and the following tests were conducted.

[0039] UV aging resistance test; the test method refers to "Laboratory Light Source Exposure Test Methods for Plastics - Part 3: Fluorescent Ultraviolet Lamps" (GB / T 16422.3-2022). Before the test, the electroplating layer on the surface of the test sample was removed. The tensile strength of the test sample was tested using a universal testing machine, and the tensile strength before aging was recorded. The test sample was then placed in a UV aging test chamber. The experimental light source was a UVA-340 ultraviolet light source with an irradiance of 0.68 W / m². 2 The cycle was 8 hours of light exposure at 60℃ followed by 4 hours of darkness exposure at 50℃, with an aging time of 2000 hours. After aging, the samples were removed and subjected to tensile strength testing again using a universal testing machine. The tensile strength retention rate of the samples was then calculated.

[0040] Coating adhesion test: The test is conducted in accordance with the "Paint and Varnish Pull-Off Adhesion Test" (GB / T 5210-2006). The coatings of two test samples are bonded together with epoxy resin adhesive. After curing at room temperature for 24 hours, the upper and lower clamps of a universal tensile testing machine are used to fix the two test samples respectively. The pull-off speed is set to 1 mm / min until the test samples are separated, and the adhesion strength of the test samples is measured.

[0041] Corrosion potential test: The surface of the test sample is connected to the wire with conductive adhesive and used as the working electrode of the electrochemical workstation. The reference electrode is a saturated calomel electrode, the counter electrode is a platinum sheet, and the electrolyte is a 3.5wt% sodium chloride aqueous solution. The corrosion potential and corrosion current density of the test sample are tested.

[0042] Neutral salt spray corrosion resistance test: The test is conducted according to the "Artificial Atmosphere Corrosion Test - Salt Spray Test" (GB / T 10125-2021). The test solution is a 50 g / L neutral sodium chloride aqueous solution. After weighing the initial sample, the sample is fixed on the support, with the sample at a 20-degree angle to the vertical. The test chamber temperature is set to 35℃, the spray pressure to 70 kPa, and the spray depth to 80 cm. 2 The average sedimentation rate within the horizontal area was 1.5 mL / h, and the test period was 720 h. After 720 h, the test sample was taken out and cleaned with 20 wt% diammonium citrate aqueous solution to remove corrosion products. The weight after retesting was measured, and the mass loss of the test sample was calculated.

[0043] Scratch resistance test: The test was conducted in accordance with the General Standard: Scratch Resistance Test Method (GMW14688), with a load of 10N, a speed of 1000mm / min, and a grid spacing of 2mm. The ΔL value of the test sample surface was measured.

[0044]

[0045] Conclusion: The test data shows that the antioxidant and corrosion-resistant automotive air intake grille prepared in Example 1 is superior to the antioxidant and corrosion-resistant automotive air intake grilles prepared in the comparative examples in terms of antioxidant and corrosion resistance. The antioxidant and corrosion-resistant automotive air intake grille improved by this invention has good resistance to ultraviolet aging and corrosion resistance, and the coating on the grille surface has strong adhesion and excellent scratch resistance.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A manufacturing process for an automotive air intake grille, characterized in that: Specifically: Step 1: Using diphenyl carbonate, bisphenol A, and hydroxyl-terminated polydimethylsiloxane as raw materials, phenoxy-terminated siloxane-modified polycarbonate is synthesized. Step 2: Using hydrotalcite, N-(4-aminophenyl)maleimide and 3.6g of pentaerythritol tetrakis(3-mercaptopropionic acid) ester as raw materials, a modified LDH antioxidant was synthesized. Step 3: Mix phenoxy-terminated siloxane-modified polycarbonate, ABS resin, modified LDHs antioxidant, compatibilizer ABS-g-MAH and lubricant vinyl bis-stearamide, granulate by twin-screw extrusion, and injection mold to obtain an automotive air intake grille.

2. The manufacturing process of an automobile air intake grille according to claim 1, characterized in that: The preparation method of phenoxy-terminated siloxane modified polycarbonate is as follows: Diphenyl carbonate and bisphenol A were mixed, and 1-butyl-3-methylimidazolium lactate was added as a catalyst under nitrogen protection. The mixture was stirred at 180-190℃ and 300-400 rpm for 2-3 hours. Then, hydroxyl-terminated polydimethylsiloxane was added, and the mixture was stirred for another 1-1.5 hours. Finally, the temperature was raised to 240-250℃, and the mixture was evacuated to 0.8-1 kPa. Diphenyl carbonate was added, and the mixture was stirred for another 0.5-1 hours. After the reaction was completed, the mixture was cooled under nitrogen protection. The product was dissolved in dichloromethane, precipitated in anhydrous ethanol, and dried under vacuum at 70-80℃ for 10-12 hours to obtain phenoxy-terminated siloxane-modified polycarbonate.

3. The manufacturing process of an automobile air intake grille according to claim 2, characterized in that: The initial mass ratio of diphenyl carbonate, bisphenol A, hydroxyl-terminated polydimethylsiloxane, and 1-butyl-3-methylimidazolium lactate is (100-120):(50-70):(5-8):(0.1-0.3); the mass of diphenyl carbonate added is 5-10% of the initial amount of diphenyl carbonate.

4. The manufacturing process of an automobile air intake grille according to claim 1, characterized in that: The preparation method of modified LDHs antioxidants is as follows: Hydrotalcite was calcined under vacuum at 500-520℃ for 3-4 hours, cooled, and then added to an ethanol-water solution. The mixture was stirred at 200-300 rpm for 20-30 minutes and ultrasonically dispersed for 5-10 minutes. Silane coupling agent KH-570 and catalyst triethylamine were added, and the reaction was carried out under nitrogen protection at 60-70℃ and 300-400 rpm for 8-12 hours. After the reaction was completed, the mixture was filtered, washed with ethanol and deionized water, and vacuum dried at 60-70℃ for 4-6 hours to obtain KH-570 modified LDHs. N-(4-aminophenyl)maleimide was added to tetrahydrofuran and stirred at 200-300 rpm for 20-30 min to obtain an imide solution. Pentaerythritol tetrakis(3-mercaptopropionic acid) and triethylamine catalyst were added to tetrahydrofuran and stirred at 200-300 rpm for 20-30 min. The mixture was then ultrasonically dispersed for 5-10 min. The imide solution was added, and the mixture was stirred at 300-400 rpm for 2-3 h under nitrogen protection at 60-70 °C. KH-570 modified LDHs were added, and the mixture was stirred for another 8-12 h. After the reaction was completed, the mixture was cooled, filtered, washed with tetrahydrofuran, and vacuum dried at 60-70 °C for 10-12 h to obtain the modified LDHs antioxidant.

5. The manufacturing process of an automobile air intake grille according to claim 4, characterized in that: The mass ratio of hydrotalcite, silane coupling agent KH-570, and triethylamine is (10-15):(2-3):(0.8-1.2). The mass ratio of N-(4-aminophenyl)maleimide, pentaerythritol tetrakis(3-mercaptopropionic acid) ester, KH-570 modified LDHs and triethylamine is (3.2-4.2):(3.6-4.6):(5-7):(0.5-0.7).

6. The manufacturing process of an automobile air intake grille according to claim 1, characterized in that: By mass fraction, the automotive air intake grille comprises: 55-65 wt% phenoxy-terminated siloxane modified polycarbonate, 8-10 wt% modified LDHs antioxidant, 5-7 wt% compatibilizer ABS-g-MAH, 0.5-1 wt% lubricant vinyl bis-stearamide, with the balance being ABS resin; the process conditions for twin-screw extrusion include: melt temperature of 240-250℃, screw speed of 200-300 rpm, and extrusion temperature of 230-240℃.

7. An electroplating process for an antioxidant and corrosion-resistant automotive air intake grille, characterized in that: The automotive air intake grille prepared using the manufacturing process described in any one of claims 1-6 is specifically as follows: S1. Plasma etching roughens the surface of the car's air intake grille to obtain a roughened car air intake grille; S2. The roughened car air intake grille is immersed in a conductive dispersion for adsorption. After adsorption, it is washed with deionized water and vacuum dried to obtain a conductive car air intake grille. S3. Conductive automotive air intake grilles are electroplated in acidic copper plating solution to obtain copper-plated automotive air intake grilles. S4. Copper-plated automotive air intake grilles are electroplated in nickel-phosphorus electroplating solutions to obtain nickel-phosphorus automotive air intake grilles. S5, nickel-phosphorus automotive air intake grilles are electroplated in cobalt-chromium electroplating solution to obtain antioxidant and corrosion-resistant automotive air intake grilles.

8. The electroplating process for an antioxidant and corrosion-resistant automotive air intake grille according to claim 7, characterized in that: In S1, the plasma etching roughening process conditions include: argon flow rate of 100-120 sccm, oxygen flow rate of 30-50 sccm, power supply of 800-1000W, rotation speed of 10-20 rpm, and processing time of 3-5 min.

9. The electroplating process for an antioxidant and corrosion-resistant automotive air intake grille according to claim 1, characterized in that: In S2, the conductive dispersion contains: 1.6-2.0 g / L dopamine hydrochloride, 0.4-0.8 g / L graphene oxide and 0.2-0.4 g / L silver nanowires, and the solvent is deionized water and anhydrous ethanol in a volume ratio of (4-5):

1.

10. The electroplating process for an antioxidant and corrosion-resistant automotive air intake grille according to claim 7, characterized in that: In S3, the electroplating process conditions include: a current density of 3-5 A / dm³. 2 The frequency is 800-1000Hz, the duty cycle is 20-30%, the electroplating temperature is 25-30℃, and the electroplating time is 25-35min; in S4, the electroplating process conditions include: current density of 4-6A / dm³. 2 The electroplating temperature is 50-60℃, the electroplating time is 20-30 min, and stirring is maintained at 80-100 rpm during the electroplating process; in S5, the electroplating process conditions include: current density of 15-20 A / dm³. 2 The electroplating temperature is 55-65℃ and the electroplating time is 5-10min; the thickness of the copper plating layer formed by electroplating in S3 is 15-20μm; the thickness of the nickel-phosphorus layer formed by electroplating in S4 is 10-15μm; and the thickness of the cobalt-chromium layer formed by electroplating in S5 is 1-2μm.

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