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Application Requirements for UV 3C Coatings

Release time:

2026-06-17 17:20

Application Requirements for UV 3C Coatings

The performance advantages of UV 3C coatings can only be realized through proper application procedures. From the application environment to substrate preparation, and from coating formulation to curing conditions, each step has its own specific requirements. Compared with other types of coatings, UV 3C coatings are more sensitive to light exposure and environmental factors, a characteristic dictated by their photopolymerization mechanism. Understanding and adhering to these application guidelines is essential to ensuring consistent and reliable coating performance.

I. Storage Requirements

UV 3C coatings have stringent storage requirements, which are directly linked to their photopolymerization characteristics. The photoinitiators in the coating can undergo reactions upon exposure to light, leading to premature curing or performance degradation within the container; therefore, they must be stored sealed and protected from light.

Temperature control is a critical factor in the storage process. UV 3C coatings should be stored in a cool, well-ventilated environment, protected from direct sunlight and high temperatures. The optimal storage temperature is typically kept within a relatively low range; excessively high temperatures can accelerate chemical reactions within the coating, compromising its stability and service life.

Regarding shelf life, UV 3C coatings have a specified shelf life when stored under appropriate conditions. Once opened, they should be used as soon as possible, and any remaining coating must not be returned to the original container to prevent contamination of the entire batch.

II. Substrate Preparation Requirements

The surface condition of the substrate directly affects coating adhesion. The housings of 3C products often utilize various plastic substrates, which may retain release agents, oil residues, dust, and other contaminants during injection molding. Prior to application, the substrate must be thoroughly cleaned to remove surface contaminants. Since the material composition of each new batch of substrates may vary, it is recommended to conduct testing and verification before use.

III. Construction Environment Requirements

The application of UV 3C coatings places stringent demands on environmental cleanliness. Dust and contaminants in the air can settle on the coating surface, creating particulate defects that compromise appearance quality. Therefore, coating operations should be carried out in a clean environment, and the work area must be thoroughly cleaned prior to application.

Temperature and humidity are also critical factors affecting construction performance. The ambient temperature should remain within an appropriate range, and relative humidity should be maintained at a suitable level. Excessively high humidity can cause the coating to turn whitish or reduce adhesion, while excessively low temperatures may impair the paint’s flow and leveling properties. The work area should be well-ventilated.

IV. Coating and Curing Requirements

The coating of UV 3C coatings is primarily applied by spraying. During the spraying process, parameters such as nozzle diameter, air pressure, and spray distance must be carefully controlled. The dry film thickness after coating should be maintained within an appropriate range.

After applying the primer, infrared leveling or low‑temperature baking is required. The purpose of this step is to ensure thorough leveling of the coating while removing solvents from the film. The baking temperature should not be too high to avoid damaging heat‑sensitive plastic substrates.

Curing is a critical step in the UV 3C coating process. Ensuring that the coating absorbs sufficient ultraviolet energy is essential for achieving optimal curing performance. Insufficient curing energy can result in tackiness and inadequate hardness, while excessive energy may lead to yellowing or thermal damage to the substrate.

For special‑effect processes that involve curing under irradiation with specific ultraviolet wavelengths, stringent requirements are imposed on the compatibility between the light source type and the curing conditions.

V. Safety Protection Requirements

UV 3C coatings contain organic solvents; operators should avoid prolonged inhalation of harmful vapors, and the work area must be well-ventilated. If the coating comes into accidental contact with skin or eyes, rinse immediately with plenty of water and seek medical attention promptly. During application, wear appropriate personal protective equipment to prevent direct skin contact with the coating.

VI. Conclusion

The application requirements for UV 3C coatings encompass multiple stages, including storage, substrate preparation, the application environment, coating and curing processes, and safety precautions. During storage, strict protection from light and precise temperature control are essential; substrate preparation must involve thorough cleaning; the application environment should be clean and maintained at appropriate temperature and humidity levels; coating and curing require meticulous control of process parameters; and safety measures must be implemented throughout the entire process. These requirements stem from the photopolymerization characteristics of UV 3C coatings, and only by adhering to them can consistent coating performance and product quality be ensured.

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 Recommended Products – 3C Coatings
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B-102	Bisphenol A epoxy acrylate	High hardness, high gloss, chemical resistance, contains 15% TMPTA.
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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.
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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.
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B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, excellent wettability, and a pleasant hand feel.
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Large-area spraying
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B-6063	Special functional group acrylate	High molecular weight, low curing shrinkage
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B-6263	Special functional group acrylate	Fast curing, high build, boil-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 outstanding chemical and wear resistance.
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B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
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B-919B	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, and outstanding chemical and wear resistance.
Oil-resistant pen
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-868	Organosilicon photocurable resin	Excellent leveling, smooth finish, fast curing, and stain resistance.
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Battery casing
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B-296	Aliphatic polyurethane acrylate	Fast curing, chemical resistance, yellowing resistance, impact resistance
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Monomer Recommendation
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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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Process flow of UV 3C coatings

Composition of UV 3C Coatings