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CN-122013270-A - Plastic surface metallization treatment process and plastic product thereof

CN122013270ACN 122013270 ACN122013270 ACN 122013270ACN-122013270-A

Abstract

The application relates to the technical field of material surface treatment, and discloses a plastic surface metallization treatment process and a plastic product thereof. The plastic surface metallization treatment process takes a plastic substrate as a raw material, and comprises six steps of surface degreasing cleaning and roughening, forming a first conductive layer, a second transition layer, a third functional layer, a color anodic oxide film and sealing treatment, particularly, the specific process parameters in the steps are limited, and the specific formula of nickel plating solution and roughening solution is adopted, so that the prepared plastic product has full metallic luster, higher pencil hardness, more adhesion force is equal to or greater than 4, RCA wear resistance, rubber wear resistance and alcohol resistance are all realized without exposing, brine spray for 72h has no rust and color change, the appearance and adhesion force are stable after high-temperature high-humidity storage, the adhesion force, hardness, wear resistance, corrosion resistance and thermal stability of a plastic coating are effectively improved, the metallic luster and color effect are maintained after the plastic surface metallization, and the high-end requirements of products such as radiator shells, decoration parts and the like are met.

Inventors

  • ZHAO HANGAO

Assignees

  • 东莞仁海科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260224

Claims (10)

  1. 1. The plastic surface metallization treatment process is characterized by comprising the following steps of: S1, surface degreasing cleaning and roughening, namely placing a plastic substrate in an alkaline cleaning agent for surface degreasing cleaning, and transferring the plastic substrate into an oxidizing roughening solution for surface roughening treatment; S2, forming a first conductive layer, namely placing the roughened plastic substrate in nickel plating solution with the pH value of 4.2-5.3, and treating for 10-30 min at the temperature of 80-92 ℃ to form the first conductive layer; S3, forming a second transition layer, namely placing the second transition layer in a preplating solution or a preplating solution for electroplating treatment to form the second transition layer; s4, forming a third functional layer, namely placing the third functional layer in aluminum chloride-alkyl pyridinium chloride fused salt electroplating solution, and electroplating the surface of the second transition layer under the conditions that the temperature is 35-50 ℃ and the current density is 0.2-3.2A/dm 2 to form the third functional layer; S5, forming a color anodic oxidation film, namely performing anodic oxidation treatment, and then placing the color anodic oxidation film in a coloring liquid for coloring to form the color anodic oxidation film; S6, sealing, namely cleaning and drying after sealing, so as to obtain the plastic product; wherein the plastic substrate is selected from one of ABS, PC/ABS alloy, PP, PBT or PPS; the nickel plating solution comprises 25-40 g/L nickel sulfate, 20-35 g/L sodium hypophosphite, 12-25 g/L sodium citrate, 15-20 g/L sodium acetate and 2-6 mg/L stabilizer.
  2. 2. The plastic surface metallization process according to claim 1, wherein in step S1, the oxidizing roughening solution is selected according to the type of the plastic substrate, When the plastic substrate is ABS, the oxidizing roughening liquid is chromic acid-sulfuric acid mixed liquid; when the plastic substrate is PC/ABS alloy, the oxidizing roughening liquid is sulfuric acid-hydrogen peroxide mixed liquid.
  3. 3. The plastic surface metallization process according to claim 1, wherein in step S1, the surface roughening treatment is performed at a temperature of 50-80 ℃ for 5-20 min.
  4. 4. The plastic surface metallization process according to claim 1, wherein in step S3, the pre-plating copper solution is a copper pyrophosphate plating solution, and the pre-plating nickel solution is a nickel sulfamate plating solution.
  5. 5. The plastic surface metallization process according to claim 4, wherein in the step S3, the copper pyrophosphate plating solution comprises 50-90 g/L copper pyrophosphate, 300-400 g/L potassium pyrophosphate, and has a pH of 8.0-9.0; The nickel sulfamate plating solution comprises 300-450 g/L nickel sulfamate, 8-15 g/L nickel chloride and 30-40 g/L boric acid, and the pH value is 3.5-4.2.
  6. 6. The plastic surface metallization process according to claim 1, wherein in step S3, the current density of the electroplating process is 0.5-2.5 a/dm 2 for 2-6 min.
  7. 7. The plastic surface metallization process according to claim 1, wherein in step S5, the anodized electrolyte is at least one of sulfuric acid, oxalic acid or phosphoric acid solution.
  8. 8. The plastic surface metallization process according to claim 1, wherein in step S6, the sealing treatment is hot water sealing, steam sealing or cold sealing liquid sealing containing nickel salt.
  9. 9. A plastic product, characterized in that a metallized decorative layer on the surface is made by the plastic surface metallization process according to any one of claims 1-8.
  10. 10. The plastic product according to claim 9, wherein the surface of the plastic substrate is sequentially laminated with a first conductive layer with a thickness of 0.3-2 μm, a second transition layer with a thickness of 1-7 μm, a third functional layer with a thickness of more than or equal to 20 μm and a color anodic oxide film with a thickness of more than or equal to 5 μm from inside to outside, and the surface of the color anodic oxide film has metallic luster.

Description

Plastic surface metallization treatment process and plastic product thereof Technical Field The application relates to the technical field of material surface treatment, in particular to a plastic surface metallization treatment process and a plastic product thereof. Background In the product fields such as radiator, electronic equipment decoration, plastic products are widely used because of advantages such as lightweight, shaping is convenient, cost is controllable. In order to improve the appearance texture and hardness, wear resistance, environmental corrosion resistance and other related physical and chemical properties of the surface of the plastic product, the surface of the plastic product is usually subjected to metallization treatment. At present, the metallization treatment process of the plastic surface mainly adopts methods of electroplating, vacuum coating, metal paint spraying and the like. The electroplating process can obtain better metallic luster and wear resistance, but the production process involves heavy metals such as chromium, nickel and the like, the environmental pollution is serious, and the wastewater treatment cost is high. The environmental protection performance of the vacuum coating process is improved, but the coating is thinner, the wear resistance and the corrosion resistance are often insufficient, and the color is single. Although the spray coating process can realize the adhesion of various colors, the coating has poor adhesion, hardness and durability, and the problems of scratch, peeling and the like are easy to occur. Anodic oxidation is a metal surface treatment technique, and is particularly widely used for aluminum and alloys thereof. A compact oxide film is generated on the surface of metal by an electrochemical method, and the oxide film has the characteristics of high hardness, wear resistance, corrosion resistance, good insulativity and the like, and is in a porous structure, so that dyes are easy to adsorb and various colors are presented. However, since plastics are insulators themselves, direct anodic oxidation is not possible, which limits the application of this technique to plastics. Disclosure of Invention In order to overcome at least one of the problems in the prior art, the application aims to provide a plastic surface metallization treatment process, which takes a plastic substrate as a raw material, realizes the synergy of the surface metallization and the color effect of the plastic substrate, endows the plastic product with metallic luster, and has higher hardness, adhesive force, wear resistance, corrosion resistance, thermal stability and other excellent performances through six steps of surface degreasing cleaning and roughening, forming a first conductive layer, forming a second transition layer, forming a third functional layer, forming a color anodic oxide film and sealing treatment. The second purpose of the application is to provide the plastic product prepared by the plastic surface metallization treatment process. For this purpose, the application adopts the following technical scheme: a first aspect of the present application provides a plastic surface metallization process comprising the steps of: S1, surface degreasing cleaning and roughening, namely placing a plastic substrate in an alkaline cleaning agent for surface degreasing cleaning, and transferring the plastic substrate into an oxidizing roughening solution for surface roughening treatment; S2, forming a first conductive layer, namely placing the roughened plastic substrate in nickel plating solution with the pH value of 4.2-5.3, and treating for 10-30 min at the temperature of 80-92 ℃ to form the first conductive layer; S3, forming a second transition layer, namely placing the second transition layer in a preplating solution or a preplating solution for electroplating treatment to form the second transition layer; s4, forming a third functional layer, namely placing the third functional layer in aluminum chloride-alkyl pyridinium chloride fused salt electroplating solution, and electroplating the surface of the second transition layer under the conditions that the temperature is 35-50 ℃ and the current density is 0.2-3.2A/dm <2 >, so as to form the third functional layer; S5, forming a color anodic oxidation film, namely performing anodic oxidation treatment, and then placing the color anodic oxidation film in a coloring liquid for coloring to form the color anodic oxidation film; S6, sealing, namely cleaning and drying after sealing, so as to obtain the plastic product; wherein the plastic substrate is selected from one of ABS, PC/ABS alloy, PP, PBT or PPS; the nickel plating solution comprises 25-40 g/L nickel sulfate, 20-35 g/L sodium hypophosphite, 12-25 g/L sodium citrate, 15-20 g/L sodium acetate and 2-6 mg/L stabilizer. In the plastic surface metallization treatment process, the plastic surface metallization treatment process is divided into six steps through a step