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Analysis of the Components of UV Coatings
Release time:
2026-03-04 06:56
UV coatings, or ultraviolet-curable coatings, are functional materials that rapidly transition from a liquid to a solid state upon exposure to ultraviolet light of a specific wavelength. Their unique photopolymerization mechanism relies on the synergistic interaction of a multi-component system, with each constituent performing distinct functions in the development of the coating’s performance characteristics.
I. Oligomers: The Backbone Material of Coatings
Oligomers are the main constituents of UV coatings and form the fundamental framework of the cured film. Their molecular weight falls between that of small molecules and polymers, and their terminal or side-chain functional groups are capable of participating in photopolymerization reactions. The type and structure of oligomers directly influence the physical and mechanical properties of the coating, including hardness, flexibility, adhesion, abrasion resistance, and weatherability. Commonly used oligomers include epoxy acrylates, polyurethane acrylates, and polyester acrylates, which can be selected and blended according to specific application requirements.
II. Reactive Diluents: Adjust System Viscosity and Participate in the Reaction
Reactive diluents, also known as functional monomers, are low-viscosity small-molecule compounds containing polymerizable functional groups. Their primary functions are to dissolve or dilute oligomers, adjust the application viscosity of coatings, and participate in the crosslinking reactions during photopolymerization, ultimately becoming part of the final coating film. The functionality and molecular structure of reactive diluents influence the curing rate, crosslink density, and the flexibility and hardness of the coating. Acrylate monomers are the most commonly used type of reactive diluent in free-radical photopolymerization systems.
III. Photoinitiators: The Key to Initiating the Curing Reaction
Photoinitiators are the core components that enable UV coatings to undergo photopolymerization; upon absorbing ultraviolet energy at specific wavelengths, they undergo cleavage to generate reactive free radicals or cations, which in turn initiate polymerization and crosslinking reactions between oligomers and reactive diluents. The type, absorption characteristics, and dosage of the photoinitiator directly influence the curing rate, curing depth, and surface cure quality of the coating. Based on their initiation mechanisms, photoinitiators can be classified into radical-initiated and cation-initiated types, each suited to different resin systems.
IV. Additives: Functional Regulation and Performance Optimization
Although used in small quantities, additives play a crucial role in regulating the processing, storage, application, and final film performance of UV coatings. Commonly used additives include:
1. Wetting and dispersing agents: improve the dispersion stability of pigments or fillers in the system;
2. Leveling agent: promotes uniform spreading of the coating film on the surface and reduces brush marks and orange-peel defects;
3. Defoamer: inhibits or eliminates air bubbles generated during the preparation and application of coatings;
4. Adhesion promoter: enhances the bond between the coating and the substrate;
5. Polymerization inhibitor: Enhances the storage stability of the coating and prevents premature polymerization under light-protected conditions.
V. Synergistic Effects of Each Component
The performance of UV coatings is not determined by a single component; rather, it results from the synergistic interaction and cooperative effects of all components within the formulation. Oligomers provide the fundamental mechanical properties, reactive diluents adjust application viscosity and crosslink density, photoinitiators control the curing rate and final cure quality, and additives are used for fine-tuning to meet specific application requirements. A well-designed formulation must comprehensively consider multiple factors, including the intended application, substrate type, application method, and curing conditions.
VI. Conclusion
The compositional system of UV coatings exemplifies the systematic and scientific approach to functional materials design. Each component plays a specific role during the photopolymerization process, collectively forming a coating with outstanding performance. With continuous advancements in materials science and photopolymerization technology, the compositional structure and application scope of UV coatings will continue to expand, providing more efficient and environmentally friendly surface treatment solutions for various industries.
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| 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, excellent chemical resistance, contains 15% TMPTA. |
| B-151 | Modified epoxy acrylate | Low halogen, yellowing resistance, excellent plating performance, and strong adhesion. |
| B-165 | Modified epoxy acrylate | Good flexibility and strong adhesion |
| B-216 | Aliphatic polyurethane acrylate | Fast curing, high build, 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 performance. |
| B-6019 | Special functional group acrylate | Excellent leveling, excellent wetting, boil-resistant, and excellent color development. |
| B-609 | Aliphatic polyurethane acrylate | Fast curing, high hardness, scratch resistance, and chemical resistance. |
| B-615A | Aliphatic polyurethane acrylate | Fast curing, good toughness, wear resistance, and chemical resistance. |
| B-619W | Aliphatic polyurethane acrylate | Fast curing, high hardness, good toughness, wear resistance, and chemical resistance. |
| B-6380N | Special functional group acrylate | Excellent adhesion, 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 devices | ||
| Product Model/English Abbreviation | Product Name/Product Type | Product Features |
| B-6211 | Aliphatic polyurethane acrylate | Fast curing, high hardness, scratch resistance, and tin-free |
| 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 UV-Curable Resin | Excellent leveling, smooth finish, fast curing, and stain resistance. |
| B-868H | Organosilicon UV-Curable 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 | Excellent flexibility, good leveling, excellent abrasion and chemical resistance, and resistance to yellowing. |
| Automotive 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-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 UV-Curable Resin | Excellent leveling, smooth finish, fast curing, and stain resistance. |
| B-868H | Organosilicon UV-Curable 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 Acrylates | Yellowing resistance, excellent wettability, low viscosity, and rapid 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 resistance, excellent plating performance, and strong adhesion. |
| B-160D | Modified epoxy acrylate | Good flexibility, yellowing resistance, and strong adhesion. |
| B-216 | Aliphatic polyurethane acrylate | Fast curing, high build, and excellent toughness |
| B-296 | Aliphatic polyurethane acrylate | Fast curing, chemical resistance, yellowing resistance, and impact resistance. |
| B-431 | Cycloaliphatic Specialty Acrylates | Yellowing resistance, excellent wettability, low viscosity, and rapid curing |
| Single Product 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) | Ethoxylated trimethylolpropane triacrylate | More flexible and less irritating than TMPTA. |
BM4241 (DiTMPTA-80) | Bis(2-hydroxyethyl)propane tetraacrylate | High crosslink density, high hardness, chemical and wear resistance, and water resistance. |
BM4242 (Di-TMPTA) | Bis(3-hydroxypropyl) 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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