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Exploring the Application of Light-Curing in Vacuum Plating
Release time:
2024-04-09 09:52
Vacuum plating
Vacuum plating involves placing the object to be coated into a vacuum chamber and then heating it to a specific temperature, causing the metal or non-metallic material to enter an evaporated state. The evaporated material flies around in the vacuum environment and deposits onto the surface of the object being coated; after cooling, it forms a thin film. This deposition process relies on the high-speed movement and collision of particles. Therefore, the film deposition rate and film quality in vacuum plating depend on factors such as vacuum quality, material purity, temperature, the distance between the material and the substrate, and the duration of the deposition process.
The coating thickness in vacuum plating typically ranges from 0.1 to 0.2 micrometers. If the coating is too thin, the topcoat may erode the underlying coat, leading to chemical changes such as surface haze. Conversely, if the coating is too thick, it can result in a whitening effect. Commonly used electroplating materials include aluminum, nickel, and copper. However, due to factors such as melting points and processing techniques, aluminum plating has become the more popular choice.
Currently, vacuum plating technology is highly popular. Products made using this technology exhibit strong metallic effects, excellent gloss, and high brightness. Compared to other coating methods, vacuum plating has lower costs and causes less environmental pollution, making it widely used across various industries.
The combination of vacuum plating technology and UV coatings
The conventional vacuum electroplating process involves first spraying a primer coat onto the substrate to be plated, followed by electroplating and then applying a topcoat. Typically, the substrates used are plastic parts. During injection molding, plastic parts can retain air bubbles and organic gases, and when left standing, they tend to absorb moisture from the air. Moreover, since plastic surfaces are often uneven, the resulting electroplated surface may lack smoothness, exhibit low gloss, and have poor metallic appearance. Additionally, defects such as air bubbles and water bubbles may appear. By applying a primer coat, a smooth and even surface is created, effectively preventing the formation of plastic bubbles and water bubbles, thereby allowing the electroplating effect to be more vividly and accurately displayed.
After the coating process is complete, since metal films tend to oxidize easily, leading to reduced luster or increased susceptibility to scratches, a topcoat is applied over the coated layer to provide additional protection. Moreover, dyes can be added to the topcoat to achieve decorative effects. In the past, vacuum electroplating primers were mainly based on thermoplastic coatings, but these typically required lengthy baking and drying times of 2 to 3 hours, significantly reducing production capacity. Consequently, following the development of UV coatings, UV coatings quickly became the mainstream choice. UV coatings offer numerous advantages, including ease of application, high production efficiency, low energy consumption, and minimal environmental pollution, posing a considerable challenge to traditional electroplating coatings. Currently, only a small number of smaller-scale factories still use these older coatings, primarily due to cost considerations.
UV Light-Curing Vacuum Plating
1. UV Curing Principle
UV-curable vacuum plating combines UV-curing technology with vacuum plating processes. A photoinitiator is added to a specially formulated resin, and ultraviolet light is used to initiate polymerization and cross-linking reactions, causing the resin to harden within a short period of time.
2. UV Coating and Vacuum Plating Process Flow
Pre-treatment (sanding, cleaning) → UV primer spraying → drying → cooling → UV curing → vacuum coating → UV topcoat spraying → drying → cooling → UV curing
3. Key Advantages
(1) High-efficiency curing: UV curing technology uses ultraviolet light irradiation to achieve rapid curing of coatings in a short period of time, speeding up the curing process during vacuum plating and thereby improving production efficiency.
(2) Superior Performance: The coating formed by the UV-curable vacuum plating process exhibits outstanding physical and chemical properties, such as excellent uniformity and gloss, high hardness, superior abrasion resistance, and weather resistance. These characteristics enable the coating to maintain its aesthetic appeal and stable performance over an extended period.
(3) Excellent Adhesion: Through the vacuum plating process, the metal film can adhere tightly to the substrate, forming a uniform and dense metal layer. This strong adhesion and resistance to detachment ensure that the coating exhibits superior durability and stability.
(4) Wide range of applications: The UV-curable vacuum plating process is suitable for a variety of materials, including plastics, metals, glass, and more. This makes it widely applicable across multiple industries, such as automotive, electronics, home appliances, and toys.
(5) Environmental Protection and Energy Efficiency: The UV light-curing process does not require the addition of extra solvents or catalysts, thereby reducing emissions of harmful substances and making it more environmentally friendly. At the same time, thanks to its rapid curing speed, energy consumption is relatively low, achieving the goal of energy conservation.
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