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CN-122011719-A - Antioxidant corrosion-resistant automobile air inlet grille and electroplating process thereof

CN122011719ACN 122011719 ACN122011719 ACN 122011719ACN-122011719-A

Abstract

The invention relates to the technical field of automobile parts, in particular to an oxidation-resistant corrosion-resistant automobile air inlet grille and an electroplating process thereof, wherein the invention adopts phenoxy-terminated siloxane modified polycarbonate, ABS resin, modified LDHs antioxidant, compatilizer ABS-g-MAH and lubricant vinyl bis stearamide to be melt blended, extruding, granulating, injection molding to obtain an automobile air inlet grille, and further electroplating and depositing a copper layer, a nickel-phosphorus layer and a cobalt-chromium layer on the automobile air inlet grille to form the oxidation-resistant corrosion-resistant automobile air inlet grille.

Inventors

  • ZHENG ZIGANG
  • JIANG BAO
  • WANG XINGQIANG
  • Sun Guohang
  • YI DENGYU
  • QI GUOLU

Assignees

  • 长春富维高新汽车饰件有限公司

Dates

Publication Date
20260512
Application Date
20260305

Claims (10)

  1. 1. A preparation process of an automobile air inlet grille is characterized by comprising the following steps: step 1, synthesizing phenoxy end-capped siloxane modified polycarbonate by taking diphenyl carbonate, bisphenol A and hydroxyl-terminated polydimethylsiloxane as raw materials; Step 2, synthesizing a modified LDHs antioxidant by taking hydrotalcite, N- (4-aminophenyl) maleimide and 3.6g pentaerythritol tetra (3-mercaptopropionate) as raw materials; And 3, mixing phenoxy end-capped siloxane modified polycarbonate, ABS resin, modified LDHs antioxidant, compatilizer ABS-g-MAH and lubricant vinyl bis stearamide, extruding and granulating by a double screw, and performing injection molding to obtain the automobile air inlet grille.
  2. 2. The process for preparing an automobile air inlet grille according to claim 1, wherein the preparation method of the phenoxy terminated siloxane modified polycarbonate is as follows: Mixing diphenyl carbonate and bisphenol A, adding a catalyst 1-butyl-3-methylimidazole lactate under the protection of nitrogen, stirring at 180-190 ℃ and 300-400rpm for reaction for 2-3 hours, then adding hydroxyl-terminated polydimethylsiloxane, continuously stirring for reaction for 1-1.5 hours, finally heating to 240-250 ℃, vacuumizing to 0.8-1KPa, adding diphenyl carbonate, continuously stirring for reaction for 0.5-1 hour, cooling under the protection of nitrogen after the reaction is finished, dissolving the product with dichloromethane, precipitating and separating out in absolute ethyl alcohol, and carrying out vacuum drying at 70-80 ℃ for 10-12 hours to obtain phenoxy terminated siloxane modified polycarbonate.
  3. 3. The preparation process of the automobile air inlet grille according to claim 2 is characterized in that the initial feeding mass ratio of diphenyl carbonate, bisphenol A, hydroxyl-terminated polydimethylsiloxane and 1-butyl-3-methylimidazole lactate is (100-120): 50-70): 5-8): 0.1-0.3, and the mass of the added diphenyl carbonate is 5-10% of the initial feeding amount of the diphenyl carbonate.
  4. 4. The preparation process of the automobile air inlet grille according to claim 1, wherein the preparation method of the modified LDHs antioxidant is as follows: Calcining hydrotalcite in vacuum at 500-520 ℃ for 3-4h, cooling, adding the hydrotalcite into ethanol water solution, stirring at 200-300rpm for 20-30min, performing ultrasonic dispersion for 5-10min, adding a silane coupling agent KH-570 and a catalyst triethylamine, performing stirring reaction at 60-70 ℃ and 300-400rpm for 8-12h under the protection of nitrogen, filtering after the reaction is finished, washing with ethanol and deionized water, and performing vacuum drying at 60-70 ℃ for 4-6h to obtain KH-570 modified LDHs; Adding N- (4-aminophenyl) maleimide into tetrahydrofuran, stirring at 200-300rpm for 20-30min to obtain an imide solution, adding pentaerythritol tetra (3-mercaptopropionic acid) ester and a catalyst triethylamine into the tetrahydrofuran, stirring at 200-300rpm for 20-30min, performing ultrasonic dispersion for 5-10min, adding the imide solution, stirring at 60-70 ℃ under the protection of nitrogen, reacting at 300-400rpm for 2-3h, adding KH-570 modified LDHs, continuing stirring for 8-12h, cooling, filtering after the reaction is finished, washing with tetrahydrofuran, and performing vacuum drying at 60-70 ℃ for 10-12h to obtain the modified LDHs antioxidant.
  5. 5. The preparation process of the automobile air inlet grille according to claim 4, wherein the mass ratio of hydrotalcite to silane coupling agent KH-570 to triethylamine is (10-15): 2-3): 0.8-1.2, the mass ratio of N- (4-aminophenyl) maleimide to pentaerythritol tetra (3-mercaptopropionic acid) to KH-570 modified LDHs to triethylamine is (3.2-4.2): 3.6-4.6): 5-7): 0.5-0.7.
  6. 6. The process for preparing the automobile air inlet grille according to claim 1, wherein the automobile air inlet grille comprises, by mass, 55-65wt% of phenoxy terminated siloxane modified polycarbonate, 8-10wt% of modified LDHs antioxidant, 5-7wt% of compatilizer ABS-g-MAH, 0.5-1wt% of lubricant vinyl bis stearamide and the balance of ABS resin, and the process conditions during twin-screw extrusion comprise a melting temperature of 240-250 ℃, a screw rotation speed of 200-300rpm and an extrusion temperature of 230-240 ℃.
  7. 7. An electroplating process of an antioxidant corrosion-resistant automobile air inlet grille, which is characterized in that the automobile air inlet grille prepared by adopting the preparation process of any one of claims 1-6 is specifically: s1, performing plasma etching roughening on the surface of an automobile air inlet grille to obtain a roughened automobile air inlet grille; s2, immersing the coarsened automobile air inlet grille into the conductive dispersion liquid for adsorption, washing with deionized water after adsorption is completed, and vacuum drying to obtain the conductive automobile air inlet grille; S3, electroplating the conductive automobile air inlet grille in the acid copper electroplating solution to obtain a copper-plated automobile air inlet grille; s4, electroplating the copper-plated automobile air inlet grille in nickel-phosphorus electroplating liquid to obtain the nickel-phosphorus plated automobile air inlet grille; S5, electroplating the nickel-phosphorus plating automobile air inlet grille in cobalt-chromium electroplating liquid to obtain the oxidation-resistant corrosion-resistant automobile air inlet grille.
  8. 8. The electroplating process of the oxidation-resistant corrosion-resistant automobile air inlet grille according to claim 7, wherein in the step S1, the plasma etching roughening process conditions comprise 100-120sccm of argon flow, 30-50sccm of oxygen flow, 800-1000W of power supply, 10-20rpm of rotation speed and 3-5min of treatment time.
  9. 9. The electroplating process of the anti-oxidation corrosion-resistant automobile air inlet grille according to claim 1, wherein in S2, the conductive dispersion liquid comprises 1.6-2.0g/L dopamine hydrochloride, 0.4-0.8g/L graphene oxide and 0.2-0.4g/L silver nanowire, and the solvent is deionized water and absolute ethyl alcohol, and the volume ratio is (4-5): 1.
  10. 10. The process for electroplating the anti-oxidation corrosion-resistant automobile air inlet grille according to claim 7, wherein in S3, the electroplating process conditions comprise a current density of 3-5A/dm 2 , a frequency of 800-1000Hz, a duty ratio of 20-30%, an electroplating temperature of 25-30 ℃, an electroplating time of 25-35min, in S4, the electroplating process conditions comprise a current density of 4-6A/dm 2 , an electroplating temperature of 50-60 ℃, an electroplating time of 20-30min, stirring at 80-100rpm during the electroplating process, in S5, the electroplating process conditions comprise a current density of 15-20A/dm 2 , an electroplating temperature of 55-65 ℃, an electroplating time of 5-10min, an electroplating copper layer thickness of 15-20 μm in S3, an electroplating nickel-phosphorus layer thickness of 10-15 μm in S4, and an electroplating cobalt-chromium layer thickness of 1-2 μm in S5.

Description

Antioxidant corrosion-resistant automobile air inlet grille and electroplating process thereof Technical Field The invention relates to the technical field of automobile accessories, in particular to an oxidation-resistant corrosion-resistant automobile air inlet grille and an electroplating process thereof. Background The automobile air inlet grille is a net-shaped part positioned at the front part of the automobile and between the front bumper and the front cross beam of the automobile body, mainly bears the functions of heat dissipation and decoration of the automobile, introduces air through grille openings, provides cooling air flow for a radiator and a condenser in an engine cabin, and ensures that the engine runs at a proper temperature. Meanwhile, as the visual center of the head part of the automobile, the design of the automobile directly influences the aesthetic degree and the brand identification degree of the whole automobile. The traditional automobile air inlet grille mainly comprises engineering plastics (such as ABS and PC/ABS) and metal layers on the surfaces of the plastics, is easily subjected to the influence of external complex working conditions in the use process, and comprises the conditions of rusting, peeling, ageing and embrittling of a plastic matrix and the like on the surface metal layers, so that the service life and the aesthetic appearance of the grille are seriously influenced. Therefore, the automobile air inlet grille with excellent oxidation resistance and corrosion resistance is developed, the durability of the grille in a severe environment is improved, the service life of the grille is prolonged, and meanwhile, an excellent decorative effect is maintained, so that the automobile air inlet grille is very important for the high-end development of the automobile air inlet grille. Disclosure of Invention The invention aims to provide an anti-oxidation corrosion-resistant automobile air inlet grille and an electroplating process thereof, which solve the problems of poor oxidation resistance and poor corrosion resistance of the automobile air inlet grille. In order to solve the technical problems, the invention provides the following technical scheme: a preparation process of an automobile air inlet grille specifically comprises the following steps: step 1, synthesizing phenoxy end-capped siloxane modified polycarbonate by taking diphenyl carbonate, bisphenol A and hydroxyl-terminated polydimethylsiloxane as raw materials; Step 2, synthesizing a modified LDHs antioxidant by taking hydrotalcite, N- (4-aminophenyl) maleimide and 3.6g pentaerythritol tetra (3-mercaptopropionate) as raw materials; And 3, mixing phenoxy end-capped siloxane modified polycarbonate, ABS resin, modified LDHs antioxidant, compatilizer ABS-g-MAH and lubricant vinyl bis stearamide, extruding and granulating by a double screw, and performing injection molding to obtain the automobile air inlet grille. As a limitation of the invention, the preparation method of the phenoxy terminated siloxane modified polycarbonate comprises the following steps: Mixing diphenyl carbonate and bisphenol A, adding a catalyst 1-butyl-3-methylimidazole lactate under the protection of nitrogen, stirring at 180-190 ℃ and 300-400rpm for reaction for 2-3 hours, then adding hydroxyl-terminated polydimethylsiloxane, continuously stirring for reaction for 1-1.5 hours, finally heating to 240-250 ℃, vacuumizing to 0.8-1KPa, adding diphenyl carbonate, continuously stirring for reaction for 0.5-1 hour, cooling under the protection of nitrogen after the reaction is finished, dissolving the product with dichloromethane, precipitating and separating out in absolute ethyl alcohol, and carrying out vacuum drying at 70-80 ℃ for 10-12 hours to obtain phenoxy terminated siloxane modified polycarbonate. Under the action of catalyst 1-butyl-3-methylimidazole lactate, the phenoxy of diphenyl carbonate and hydroxy of bisphenol A undergo transesterification reaction to produce phenol and polycarbonate oligomer, then the phenoxy at the tail end of polycarbonate oligomer and the hydroxy of added hydroxy-terminated polydimethylsiloxane undergo transesterification reaction to produce PC-PDMS-PC segmented copolymer, finally the reaction temperature and the vacuum degree of the reaction system are raised, the removal of the phenol by-product of transesterification is promoted, diphenyl carbonate is added, the phenoxy and hydroxy-terminated of segmented copolymer undergo transesterification reaction, phenoxy is grafted to hydroxy-terminated of segmented copolymer to obtain phenoxy terminated siloxane modified polycarbonate, and the siloxane segment in the structure is a flexible segment, so that energy can be effectively dispersed and absorbed when the polycarbonate is stressed, thereby obviously improving the toughness and impact resistance of the material. The inherent low intermolecular forces and lubricating effects of the siloxane segments also signi