-
Product Center
-
-
Contact Us
Tel
Tel
+8618142863185
Follow us
Official Accounts
Official Accounts
- Top
Process Requirements for Waterborne UV 3C Coatings
Release time:
2026-07-08 23:50
Whether the performance of waterborne UV coatings for 3C applications can be fully realized depends largely on whether application procedures are carried out in accordance with established standards. Compared with solvent-based UV coatings, waterborne systems impose stricter requirements on the application environment, equipment specifications, and process control; they feature a narrower processing window and demand higher‑grade equipment and environmental conditions. From ambient temperature and humidity to coating formulation, from spray parameters to pre‑baking conditions, and even to UV curing energy, the precise control of each step directly affects the coating’s adhesion, surface appearance, and durability. Understanding and adhering to these application guidelines is essential for achieving optimal coating results.
I. Construction Environment Requirements
The temperature and humidity of the application environment directly affect the coating performance of waterborne UV coatings. In waterborne systems, water serves as the primary diluent, and its evaporation is highly sensitive to environmental conditions; consequently, the requirements for controlling temperature and humidity are more stringent than those for solvent-based systems.
Regarding temperature control, the application temperature should be maintained within an appropriate range. At excessively low temperatures, water evaporates slowly, reducing production efficiency; at excessively high temperatures, moisture in the coating evaporates too rapidly, potentially leading to poor leveling or premature surface drying. When the application temperature is too high, the coating may dry on the surface before the internal moisture has fully evaporated. Temperature fluctuations directly affect the coating’s application viscosity and leveling behavior, so stable temperature conditions must be ensured.
In terms of humidity control, relative humidity should be maintained within an appropriate range. When humidity is too low, rapid evaporation can compromise the coating’s leveling; when it is too high, insufficient evaporation may lead to defects such as whitening and reduced adhesion. In high-humidity conditions, it is advisable to use dehumidification equipment or extend drying time to prevent residual moisture from adversely affecting coating performance. Even slight fluctuations in humidity can result in noticeable differences in coating appearance, so precise humidity control is essential.
In terms of ventilation and cleanliness, the work environment must be kept clean, and any dust generated during application should be removed immediately to prevent contamination of the paint film’s appearance. At the same time, adequate ventilation must be maintained: stagnant moisture can hinder the coating’s drying and film formation, while excessive airflow can compromise coating quality. Waterborne systems are particularly sensitive to airborne contaminants, requiring a higher level of cleanliness than solvent-based systems.
II. Coating Mixing Requirements
Waterborne UV coatings must be properly formulated before application to ensure they achieve an optimal workable condition. Given the narrow application window of waterborne systems, precise control during the formulation process is especially critical.
Regarding stirring and viscosity adjustment, the coating should be thoroughly mixed before use. Stratification may occur during storage, and insufficient mixing can lead to uneven coating performance. During application, adjust the coating’s viscosity according to ambient temperature and humidity: in high‑temperature, low‑humidity conditions, a small amount of water may be added to extend leveling time; in high‑temperature, high‑humidity conditions, viscosity should be controlled to prevent sagging. Even minor deviations in viscosity can result in defects such as poor leveling or sagging, so precise control is essential.
With regard to filtration requirements, the prepared coating must be filtered before application to remove any entrained impurities and particulates, thereby ensuring the quality of the coated surface.
Regarding light‑protected storage, waterborne UV coatings are sensitive to light; they should be stored, transferred, and mixed in opaque containers. When opening the container for use, avoid direct sunlight, and never store the product uncovered in areas exposed to visible light, as this may lead to gelation and degradation, rendering the coating ineffective.
III. Spray Application Requirements
Spraying waterborne UV coatings places stringent demands on application equipment, as the performance and condition of the equipment directly affect coating quality.
Regarding coating thickness and application method, waterborne UV coatings should be applied using the “thin coats, multiple layers” principle, with each individual coat kept relatively thin. Applying a thick coat in one pass can cause the surface to dry too quickly while the underlying layers dry slowly, leading to defects such as wrinkling and cracking. Excessive coating thickness may also result in incomplete curing or shrinkage‑induced cracking.
In terms of spraying parameters, the nozzle diameter, spray distance, and spray pressure must be adjusted according to the actual workpiece geometry and coating characteristics to achieve optimal atomization and uniform coating. The spraying equipment should offer high adjustment accuracy to accommodate the narrow process window typical of waterborne systems.
Regarding workpiece inspection and surface preparation, prior to spraying, the workpiece must be inspected to ensure that its surface is clean and free of oil, dust, and other contaminants. If the substrate surface temperature is excessively high, it should be pre‑cooled before application to prevent thermal expansion from causing cracking in the paint film.
IV. Pre-baking and Leveling Requirements
Before UV curing, waterborne UV coatings must undergo thorough pre‑baking to remove moisture from the coating. This step is a requirement unique to waterborne UV applications and a critical factor influencing coating performance. Pre‑baking conditions must be precisely controlled; deviations can result in residual moisture or overheating of the substrate.
Regarding the leveling stage, sufficient leveling time should be allowed after application to ensure the coating fully spreads, eliminates spray marks, and achieves a smooth, even surface.
Regarding forced drying, the drying time must be determined based on the coating weight. When the coating weight is high, the drying time should be extended accordingly. The forced‑drying temperature should be maintained within an appropriate range, and humidity should be kept low to ensure thorough water removal. Before the paint film cures, sufficient moisture must evaporate; otherwise, the coating’s performance will be difficult to meet specifications. When drying conditions fluctuate, waterborne systems exhibit lower tolerance than solvent‑based systems and are more prone to defects.
Regarding precautions before the surface dries, avoid exposing the paint film to strong direct winds to prevent shrinkage and cracking. When using infrared or hot-air equipment, carefully control temperature and exposure time to prevent deformation of the substrate.
V. UV Curing Requirements
UV curing is a critical step in the application of waterborne UV coatings, and the curing conditions directly affect the coating’s performance.
Regarding curing energy, an appropriate level should be set based on the coating formulation and film thickness. Insufficient curing energy can result in incomplete cure, inadequate film hardness, and poor chemical resistance; excessive energy, on the other hand, may lead to yellowing or thermal damage to the substrate.
In terms of light source compatibility, the curing of waterborne UV coatings must be matched to the type of light source. For colored systems, special photoinitiators must be used in conjunction with the appropriate light source to ensure complete curing.
Regarding pre‑curing verification, it is essential to ensure that all moisture has fully evaporated from the coating before UV curing. If UV curing is performed while residual moisture remains, it may result in a whitening defect. After the water has evaporated, the coating can undergo physical drying; however, at this stage it still lacks adequate chemical and mechanical resistance and will only achieve its full performance after UV curing.
VI. Comprehensive Management of Construction Windows
Waterborne UV coatings have a narrow application window, meaning that the allowable variation in process parameters is limited, thereby demanding greater operational precision and tighter process control. Even minor fluctuations in ambient temperature and humidity, slight deviations in coating viscosity, or variations in pre‑baking conditions can all lead to coating defects. Consequently, it is essential to implement a more rigorous process‑control system, regularly calibrate equipment, monitor environmental conditions, and record critical process parameters to ensure that operating conditions remain within acceptable limits at all times.
VII. Conclusion
The application requirements for waterborne UV 3C coatings encompass multiple stages, including environmental control, coating formulation, spray application, pre‑baking and leveling, and UV curing. Ambient temperature and humidity must be maintained within appropriate ranges; excessively high or low humidity can compromise coating quality. The coating should be thoroughly mixed, appropriately diluted, and filtered before use, and stored away from light. Spray application is best performed using a thin‑coat, multi‑pass technique, with careful control of coating weight and spray parameters. Pre‑baking must ensure complete evaporation of moisture to prevent whitening after curing. Curing energy must be matched to the coating formulation and the type of curing source to achieve full crosslinking. Given the narrow processing window of waterborne UV coatings, higher precision is required at every stage, demanding meticulous process management and rigorous in‑process control. Ensuring that all application requirements are strictly adhered to is the reliable foundation for achieving high‑quality waterborne UV 3C coatings.
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.
Bossin 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 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-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 outstanding 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 | Excellent leveling, smooth finish, fast curing, and stain resistance. |
B-868H | Organosilicon photocurable resin | Excellent 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 resistant to yellowing. |
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 photocatalytic–thermal 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 outstanding 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 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. |
B-868H | Organosilicon photocurable resin | Excellent 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 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. |
Share to:
Related News
Fax: +86 20-3437 9190
Address: 8-9 / F,Building B,Pazhou Science and Technology Park, Xingang East Road, Haizhu District, Guangzhou City, Guangdong Province
Follow us
Copyright © Guangdong Bossin Novel Materials Technology Co., Ltd. All rights reserved.
