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An Introduction to UV Vacuum Plating Technology

Release time:

2026-05-20 07:23

An Introduction to UV Vacuum Plating Technology

Vacuum plating is a surface‑treatment technique that deposits metallic materials onto the surface of a substrate under vacuum conditions, enabling non‑metallic products such as plastics to exhibit a metallic luster. However, conventional vacuum plating typically relies on thermal curing during the coating‑curing stage, which suffers from high energy consumption, low efficiency, and solvent emissions. UV vacuum plating builds upon traditional vacuum plating by integrating ultraviolet‑curable coatings into the process, replacing conventional thermally cured coatings. This approach not only preserves the metallic aesthetic but also significantly enhances curing efficiency and environmental performance.

I. Overview of Vacuum Plating Technology

Vacuum plating refers to a technique in which metal materials are evaporated or sputtered and deposited onto the surface of a workpiece via physical vapor deposition under vacuum conditions. Common coating methods include thermal evaporation and magnetron sputtering. In thermal evaporation, the metal is heated to vaporize it, and the vaporized atoms condense on the substrate surface to form a thin film; in magnetron sputtering, ions generated by glow discharge bombard the target material, causing its atoms to be ejected and deposited onto the substrate. The vacuum environment minimizes interference from gas molecules during the coating process, allowing metal particles to deposit directly onto the substrate and form a uniform, dense metallic film. Magnetron sputtering offers greater technical advantages due to its dense coatings and strong adhesion.

II. Basic Concepts of UV Vacuum Plating

UV vacuum plating is a hybrid process that builds on conventional vacuum coating technology by incorporating UV‑curable coatings. Its core principle involves depositing a metallic film under vacuum conditions, followed by the application of a UV‑curable coating to protect and cure the metal layer. This process enables the creation of metallic‑lustered decorative finishes on non‑metallic substrates such as plastics, while addressing the low efficiency and high energy consumption associated with traditional thermal curing methods.

From a technical perspective, UV vacuum plating primarily comprises two key components: vacuum coating and UV-curable coatings. Vacuum coating forms the metallic luster layer, while the UV-curable coating protects the metal layer and enhances overall performance.

UV-curable coatings are coating systems that rapidly cure upon exposure to ultraviolet light, typically comprising photopolymerizable resins, reactive monomers, photoinitiators, and various additives. Under UV irradiation, the photoinitiator decomposes to generate free radicals, which initiate polymerization of the resin and monomers, enabling the coating to transition from a liquid state to a solid state within seconds. Compared with conventional thermally cured coatings, UV curing offers advantages such as rapid curing, low energy consumption, and the absence of solvent volatilization, thereby meeting the requirements of environmentally friendly manufacturing.

III. Coating Structure

The UV vacuum plating process typically employs a three-layer structure, with each layer serving a specific function.

The primer layer is applied to the surface of the plastic substrate, primarily to seal microscopic defects and achieve a smooth, mirror-like finish. It also prevents volatile substances within the substrate from escaping during vacuum plating, thereby safeguarding coating quality, and enhances adhesion between the coating and the substrate.

The coating layer is the core component of vacuum electroplating, formed as a metallic thin film on the primer surface via physical vapor deposition. Commonly used coating materials include metals such as aluminum, tin, indium, and copper; among these, aluminum is widely employed due to its low evaporation temperature, excellent adhesion, and cost-effectiveness. The coating layer typically measures only 0.01 to 0.1 micrometer in thickness—extremely thin yet sufficient to produce a metallic luster.

The topcoat is applied over the coating layer to protect the metallic finish and resist external abrasion and corrosion. Pigments may be added to the topcoat as needed to achieve desired colors and enhance its decorative appeal.

IV. Conclusion

Vacuum plating technology enables non-metallic materials such as plastics to achieve a metallic luster, enhancing the decorative appeal of industrial products. UV vacuum plating builds on conventional vacuum plating by replacing thermally cured coatings with UV‑curable formulations, thereby preserving the metallic finish while improving curing efficiency, reducing energy consumption, and minimizing solvent emissions. With its three‑layer structure—primer, coating, and topcoat—this process has become a key surface‑treatment technique in sectors including cosmetic packaging, automotive components, and consumer electronics.

Disclaimer: The above content has been compiled from publicly available sources and is provided for reference only. If any infringement occurs, please contact us, and we will address it promptly.

Bosheng Related Product Recommendations – Vacuum Plating
Primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA.
B-151	Modified epoxy acrylate	Low halogen, yellowing-resistant, excellent plating performance, and strong adhesion.
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and excellent adhesion.
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-212A	Aromatic polyurethane acrylate	High cost-performance, excellent plating adhesion, good toughness, and resistant to boiling water.
B-221	Aliphatic polyurethane acrylate	Fast curing, resistant to boiling water
B-268M	Aliphatic polyurethane acrylate	Good flexibility, excellent adhesion, superior plating performance, and strong hiding power.
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability, suitable for LED UV.
B-619W	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, wear resistance, and chemical resistance.
Intermediate coat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-374	Aliphatic polyurethane acrylate	Good flexibility, excellent leveling, resistant to abrasion and chemicals, and yellowing‑resistant.
B-601	Aromatic polyurethane acrylate	High hardness, scratch resistance, chemical resistance, and excellent cost-effectiveness.
B-6020	Special functional group acrylate	Resistant to boiling water, excellent color development, and strong interlayer adhesion.
Topcoat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-221	Aliphatic polyurethane acrylate	Fast curing, resistant to boiling water
B-301	Aromatic polyurethane acrylate	Fast curing, excellent toughness, and good sandability.
B-302	Aromatic polyurethane acrylate	Fast curing, high strength, excellent toughness, and good grindability.
B-368	Aliphatic polyurethane acrylate	Good toughness, excellent leveling, excellent bend resistance, and excellent heat resistance.
B-374	Aliphatic polyurethane acrylate	Good flexibility, excellent leveling, resistant to abrasion and chemicals, and yellowing‑resistant.
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability, suitable for LED UV.
B-601	Aromatic polyurethane acrylate	High hardness, scratch resistance, chemical resistance, and excellent cost-effectiveness.
B-6016C	Special functional group acrylate	Easy to apply, resistant to yellowing and boiling water, and improves the appearance of the paint film.
B-6019	Special functional group acrylate	Good leveling, excellent wettability, resistant to boiling water, and superior color dispersion.
B-609	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch resistance, and chemical resistance.
B-615A	Aliphatic polyurethane acrylate	Fast curing, excellent toughness, wear resistance, and chemical resistance.
B-619W	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, wear resistance, and chemical resistance.
B-6210	Aliphatic polyurethane acrylate	Low viscosity, chemical resistance, environmental resistance, and dual photocatalytic–thermal curing.
B-6211	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch-resistant, and free of organotin.
B-919B	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and superior chemical and wear resistance.
Monomer Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM2223 (TPGDA)	Dipropylene glycol diacrylate	Good flexibility and low volatility
BM3231 (TMPTA)	Trimethylolpropane triacrylate	High crosslink density, high hardness, high gloss, and excellent wear resistance.
BM3235 (PET3A)	Pentaerythritol triacrylate	Fast curing, high crosslink density, high hardness, and chemical resistance.
BM3380 (3EO-TMPTA)	Pentaerythritol triacrylate	More flexible and less irritating than TMPTA.
BM6261 (DPHA-80)	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.
BM6263 (DPHA-90)	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.

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