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What is UV 3C coating?

Release time:

2026-06-12 06:58

In today’s world, where consumer electronics are ubiquitous in everyday life, the surfaces of devices such as smartphones, laptops, tablets, and smartwatches must not only deliver an aesthetically pleasing appearance but also resist scratches, fingerprints, and chemical degradation encountered during daily use. Achieving these performance attributes relies heavily on a specialized coating—UV 3C coating. Leveraging ultraviolet curing technology, this material forms a protective and decorative layer on the exterior of electronic products, making it the mainstream surface‑treatment solution across the 3C industry.

I. Definition

UV 3C coatings are ultraviolet‑curable coatings applied to the surfaces of computers, communication devices, and consumer electronics. The term “3C” stands for the initial letters of Computer, Communication, and Consumer Electronics, encompassing a wide range of information technology and consumer electronic products, including smartphones, laptops, tablets, wearable devices, and smart home appliances. Meanwhile, “UV” refers to ultraviolet curing, which is the key technological feature that distinguishes these coatings from traditional heat‑cured alternatives.

The fundamental operating principle of UV‑curable 3C coatings is as follows: after the liquid coating is applied to the surface of an electronic device’s housing, ultraviolet irradiation triggers a polymerization reaction in the coating. The photoinitiator within the coating absorbs light energy, initiating this reaction and transforming the liquid coating into a dense, solid film within seconds. This process enables rapid conversion from liquid application to solidification, while simultaneously providing both protective and decorative benefits to the product’s surface.

II. Composition

UV 3C coatings are composed of multiple functional components, each of which plays a distinct role in the formulation.

Oligomers serve as the film-forming agents in coatings and are the key components that determine the coating’s fundamental performance. Common oligomer types include polyurethane acrylates and epoxy acrylates. Polyurethane acrylates offer excellent flexibility and strong adhesion, making them well suited for applications with demanding impact‑resistance requirements; epoxy acrylates provide high hardness and superior gloss, ideal for high‑gloss decorative coatings. In practical formulations, different oligomer types are often blended to strike a balance between hardness and flexibility.

Active monomers serve a dual purpose in formulations: they modulate viscosity and participate in curing. As diluents, they adjust the coating to an optimal viscosity for application; as reactive components, their unsaturated double bonds undergo polymerization upon UV irradiation, becoming integral parts of the polymer network. Polyfunctional monomers can increase the crosslink density of the coating, thereby enhancing its hardness, abrasion resistance, and chemical resistance.

Photoinitiators are key components of UV-curing systems. Upon exposure to ultraviolet light, they absorb photons of specific wavelengths and decompose to generate free radicals, which initiate polymerization reactions between oligomers and monomers, enabling the coating to transition from a liquid to a solid state within seconds. Different types of photoinitiators exhibit distinct absorption characteristics for various UV wavelengths; therefore, it is essential to select a photoinitiator system that matches the wavelength of the curing equipment’s light source.

Although additives are used in small quantities in formulations, they significantly influence application performance and coating quality. Leveling agents promote uniform film spread, defoamers suppress bubble formation, and abrasion‑resistant additives enhance scratch resistance; the synergistic effects of these various additives ensure that the coating meets its intended aesthetic and performance specifications.

III. Main Features

A defining feature of UV 3C coatings is their curing mechanism. Under ultraviolet irradiation, the coating transitions from liquid to solid within seconds—far faster than the tens of minutes or even hours required by conventional thermally cured coatings. This rapid curing enables continuous operation on production lines, significantly boosting manufacturing efficiency.

Unlike conventional thermal curing processes that require heating and baking, UV curing is carried out at near‑room temperature, eliminating the need for substantial thermal energy and significantly reducing energy consumption. Moreover, UV 3C coatings are formulated with high solid content or low volatile organic compound (VOC) levels, resulting in virtually no solvent evaporation during curing and minimizing environmental impact, thereby meeting the requirements of green manufacturing.

In terms of coating performance, UV 3C coatings deliver a surface with high hardness, excellent wear resistance, and superior gloss. The dense polymer network formed upon full curing endows the coating with outstanding scratch resistance and chemical‑resistance. Electronic device housings are frequently exposed to keys, coins, perspiration, skincare products, and other everyday factors; the UV 3C coating effectively safeguards against such external aggressions.

IV. Conclusion

Thanks to its rapid curing, environmental friendliness, energy efficiency, and superior coating performance, UV 3C coatings have become the mainstream technology for surface finishing in electronic products such as smartphones and laptops. With the emergence of new product categories like foldable smartphones and wearable devices, UV 3C coatings will continue to evolve toward higher performance, multifunctionality, and green sustainability, delivering even more advanced surface‑protection solutions for 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 – 3C Coatings
General-purpose
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-102	Bisphenol A epoxy acrylate	High hardness, high gloss, chemical resistance, contains 15% TMPTA.
B-151	Modified epoxy acrylate	Low halogen, yellowing-resistant, excellent plating performance, and strong adhesion.
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-216	Aliphatic polyurethane acrylate	Fast curing, high fullness, and excellent toughness.
B-368	Aliphatic polyurethane acrylate	Good toughness, excellent leveling, excellent bend resistance, and excellent heat resistance.
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-6019	Special functional group acrylate	Good leveling, excellent wetting, 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-6380N	Special functional group acrylate	Excellent adhesion to plastics, strong hiding power, and improved paint film appearance.
B-919B	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and superior chemical and wear resistance.
Matte
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-572	Polyester acrylate	Low viscosity, low odor, excellent wettability, suitable for LED UV.
B-650A	Aliphatic polyurethane acrylate	Low viscosity, excellent matting effect, fast curing, and good wettability.
Wearable device
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-6211	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch-resistant, and free of organotin.
Hand feel
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, excellent wettability, and a pleasant hand feel.
B-868	Organosilicon photocurable resin	Good leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon photocurable resin	Good leveling, smooth finish, fast curing, and stain resistance.
Large-area spraying
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.
Car interior
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-6063	Special functional group acrylate	High molecular weight, low curing shrinkage
B-6210	Aliphatic polyurethane acrylate	Low viscosity, chemical resistance, environmental resistance, and dual photothermal curing.
B-6263	Special functional group acrylate	Fast curing, high build, boil‑water resistant, and excellent toughness.
B-916	Aliphatic polyurethane acrylate	Low viscosity, solvent resistance, chemical resistance, and steel-wool resistance.
B-919B	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and superior chemical and wear resistance.
Resistant to steel wool
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
B-916	Aliphatic polyurethane acrylate	Low viscosity, solvent resistance, chemical resistance, and steel-wool resistance.
B-919B	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and superior chemical and wear resistance.
Oil-resistant pen
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-868	Organosilicon photocurable resin	Good leveling, smooth finish, fast curing, and stain resistance.
B-868H	Organosilicon photocurable resin	Good leveling, smooth finish, fast curing, and stain resistance.
Battery casing
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-431	Cycloaliphatic Specialty Acrylate	Yellowing-resistant, excellent wettability, low viscosity, fast curing
B-548	Polyester acrylate	Withstands high temperatures of 250–280°C.
Solid color paint
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-519	Self-curing polyester acrylate	Self-initiated photopolymerization performance
B-560	Polyester acrylate	Fast curing and excellent pigment wetting.
Yellowing resistance
Product Model/English Abbreviation	Product Name/Product Type	Product Features
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-216	Aliphatic polyurethane acrylate	Fast curing, high fullness, and excellent toughness.
B-296	Aliphatic polyurethane acrylate	Fast curing, chemical resistance, yellowing resistance, impact resistance
B-431	Cycloaliphatic Specialty Acrylate	Yellowing-resistant, excellent wettability, low viscosity, fast curing
Monomer Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
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 excellent chemical resistance.
BM3380 (3EO-TMPTA)	Pentaerythritol triacrylate	More flexible and less irritating than TMPTA.
BM4241 (DiTMPTA-80)	Bis(2,3-dihydroxypropyl) tetraacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.
BM4242 (Di-TMPTA)	Bis-trimethylolpropane tetraacrylate	High crosslink density, high hardness, chemical and wear resistance, and water resistance.
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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