News

Knowledge

Company News

Application Mind Map

Test Report

Technical Article

Industry News

Analysis of the Chemical Properties of UV Wood Coatings

Release time:

2026-03-06 17:24

Analysis of the Chemical Properties of UV Wood Coatings

UV wood coatings, as an environmentally friendly coating that cures rapidly upon exposure to ultraviolet light, possess chemical properties that confer unique advantages in wood finishing applications such as furniture and flooring. These coatings are formulated with photopolymerizable resins, reactive monomers, photoinitiators, and additives as core components, enabling a precise chemical design that strikes an optimal balance between rapid curing and superior performance while meeting the dual demands of environmental sustainability and operational efficiency in modern industrial settings.

I. Chemical Synergy of Core Ingredients

The chemical system of UV wood coatings consists of four major classes of components, which achieve functional complementarity through synergistic interactions at the molecular level.

Photopolymerizable resins serve as the backbone of the coating, with unsaturated double bonds at the ends of their molecular chains. Upon exposure to ultraviolet light, these double bonds undergo crosslinking reactions with the double bonds in reactive monomers, thereby forming a dense three-dimensional network structure. Epoxy acrylates and polyurethane acrylates are two major classes of resins: the former is renowned for its rapid curing and high hardness, while the latter enhances the coating’s impact resistance by incorporating flexible segments.

Active monomers serve a dual function as both solvents and crosslinking agents. The number of double bonds in their molecular structure directly influences the curing rate and the crosslink density of the coating: polyfunctional monomers can significantly enhance coating hardness, but their associated increase in viscosity must be carefully balanced; monofunctional monomers, on the other hand, are used to adjust the system’s flow properties and ensure smooth application.

Photoinitiators serve as the chemical switches in UV curing. Upon absorption of UV light energy, photoinitiator molecules undergo cleavage to generate free radicals or cations, thereby initiating the polymerization of resins and monomers. Free-radical photoinitiators dominate the market due to their high reaction efficiency, whereas cationic photoinitiators are suited to specific resin systems and offer the advantage of low volumetric shrinkage.

The additive system optimizes application performance by controlling rheology and surface properties. Leveling agents reduce surface tension, thereby eliminating orange-peel defects and pinholes; defoamers suppress air bubbles during application; light stabilizers retard yellowing of the coating; and nano-fillers enhance hardness while maintaining transparency. These additives bond with the base formulation through intermolecular forces or chemical bonding, forming a stable chemical system.

II. The Chemical Nature of Photoinitiated Chain Polymerization

The curing process of UV wood coatings is essentially a photoinitiator-driven chain polymerization reaction, which can be divided into three stages in terms of its chemical mechanism.

In the initial stage, photoinitiator molecules absorb ultraviolet light energy and undergo a transition from the ground state to the excited state, followed by homolytic or heterolytic cleavage to generate highly reactive free radicals or cations. These active species serve as the initiation points for polymerization reactions, and their stability directly affects curing efficiency.

During the chain-growth phase, free radicals or cations attack the double bonds in the resin and monomer molecules, generating new active centers and initiating chain propagation. As the reaction proceeds, the polymer chains cross-link via these double bonds to form a three-dimensional network structure, causing the coating to transition from a liquid to a solid state. In this process, the chemical structures of the resin and monomers determine the crosslinking density, which in turn influences the coating’s hardness and flexibility.

During the post-curing stage, once UV irradiation is discontinued, unreacted double bonds may remain in the coating. Thermal treatment or ambient storage allows these residual double bonds to continue reacting, thereby further increasing the crosslink density. In some systems, a dual-curing approach is employed: by incorporating waterborne resins or isocyanate groups, complete curing in shadowed areas is achieved, ensuring uniform coating performance.

III. Chemical Correlation Between Molecular Structure and Properties

The molecular structural characteristics of UV wood coatings directly determine their physical performance.

High crosslink density is the chemical foundation of coating hardness. After curing, the coating exhibits an extremely high conversion rate of double bonds, forming a dense network structure that imparts outstanding wear resistance and scratch resistance. This structural feature makes the coating less prone to plastic deformation under external loads, thereby maintaining surface smoothness.

The flexibility and impact resistance of the coating stem from the chemical design of the resin molecular chains. By incorporating flexible segments such as polyether or polyester units, the degree of molecular chain mobility can be increased while maintaining a consistent crosslink density. Upon impact, these flexible segments absorb energy through deformation, thereby preventing cracking and delamination of the coating.

Adhesion results from interfacial chemical interactions. Polar functional groups in the photosensitive resin molecules can form hydrogen bonds or covalent bonds with cellulose and lignin in wood, thereby enhancing interfacial bonding strength. This chemical bonding ensures that the coating maintains stable adhesion even under humid conditions or during temperature fluctuations, thus minimizing the risk of delamination.

IV. Chemical Realization of Environmental Protection Characteristics

The environmental advantages of UV wood coatings stem from the green design of their chemical formulation.

The absence of solvent volatilization is at the heart of its environmental friendliness. The curing process involves only intermolecular crosslinking reactions, eliminating the need for solvent evaporation and thereby keeping volatile organic compound emissions at extremely low levels. Waterborne UV systems go a step further by replacing organic solvents with water, achieving near-zero VOC emissions and meeting indoor air quality standards.

Reducing the toxicity of photoinitiators is crucial for ensuring safety. Traditional photoinitiators may leave behind harmful residues such as benzene; modern systems, by optimizing molecular structures and employing low-migration photoinitiators like acyl phosphine oxides, keep residual levels of these harmful substances within safe limits, thereby safeguarding health and safety during both application and use.

The energy-efficiency advantage stems from its rapid curing characteristics. UV curing consumes significantly less energy than thermal curing, and the curing time is reduced to just a few seconds, substantially lowering overall production energy consumption. The use of LED light sources further reduces electricity consumption while eliminating ozone pollution associated with conventional mercury lamps, thereby enabling clean production.

V. Conclusion

The chemical characteristics of UV wood coatings are the fundamental basis for their performance advantages and environmental benefits. Through the precise formulation of photopolymerizable resins, reactive monomers, photoinitiators, and additives, combined with the rapid chain-growth polymerization initiated by light, these coatings achieve an optimal balance among key physical properties—such as hardness, flexibility, and adhesion—and environmental sustainability. With breakthroughs in green chemistry technologies, including bio-based resins and low-migration photoinitiators, UV wood coatings are expanding beyond traditional wood finishing applications into a broader range of industrial sectors, continuously driving the coatings industry toward greater efficiency, lower carbon emissions, and sustainable development.

Disclaimer: The above content is sourced from the internet and is provided for reference only. If any infringement occurs, please contact us, and we will remove it promptly.

Bossin Recommended Products – UV Wood Coatings
Putty primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
Sanding primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
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-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
Apply primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-02	Phosphate ester acrylate	Enhances adhesion to substrates such as metal, glass, and plastic.
B-05	Phosphate ester acrylate	Enhances adhesion to substrates such as metal, glass, and plastic.
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
B-535	Polyester acrylate	Excellent adhesion, rapid curing, good flexibility, and yellowing resistance.
B-546	Polyester acrylate	Good adhesion, fast curing, and excellent flexibility.
White primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and excellent adhesion.
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
B-529	Polyester acrylate	Good adhesion, low shrinkage, and excellent resin compatibility.
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
Gloss topcoat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-21C	Active amine photosensitizing promoter	Low color number, antioxidant and polymerization inhibitor, and enhanced curing rate
B-301	Aromatic Polyurethane Acrylate	Fast curing, good toughness, and excellent grindability.
B-302	Aromatic Polyurethane Acrylate	Fast curing, high strength, good toughness, and excellent grindability.
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-609	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch resistance, and chemical resistance.
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.
B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, good toughness, and excellent chemical and wear resistance.
Matte topcoat
Product Model/English Abbreviation	Product Name/Product Type	Product Features
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-21C	Active amine photosensitizing promoter	Low color number, antioxidant and polymerization inhibitor, and enhanced curing rate
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, excellent wettability, and a pleasant hand feel.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting, good wetting, and a fine, smooth, and silky hand feel.
B-333	Aliphatic polyurethane acrylate	Low viscosity, excellent matting effect, good wetting properties, and excellent flexibility.
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.
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.
B-910A2	Aliphatic polyurethane acrylate	Low viscosity, yellowing resistance, chemical resistance, and steel-wool resistance.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, good toughness, and excellent chemical and wear resistance.
Bright White Finish
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and excellent adhesion.
B-301	Aromatic Polyurethane Acrylate	Fast curing, good toughness, and excellent grindability.
B-302	Aromatic Polyurethane Acrylate	Fast curing, high strength, good toughness, and excellent grindability.
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
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-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.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, good toughness, and excellent chemical and wear resistance.
Adherent
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-05	Phosphate ester acrylate	Enhances adhesion to substrates such as metal, glass, and plastic.
B-509B	Polyester acrylate	Good adhesion, good flexibility, and excellent pigment wetting.
B-531	Polyester acrylate	Good adhesion, impact resistance, excellent flexibility, and yellowing resistance.
B-535	Polyester acrylate	Excellent adhesion, rapid curing, good flexibility, and yellowing resistance.
B-546	Polyester acrylate	Good adhesion, fast curing, and excellent flexibility.
B-590	Polyester acrylate	Excellent adhesion, rapid curing, and good pigment wetting.
Filler type
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
B-529	Polyester acrylate	Good adhesion, low shrinkage, and excellent resin compatibility.
Color correction
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
Harden
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-301	Aromatic Polyurethane Acrylate	Fast curing, good toughness, and excellent grindability.
B-302	Aromatic Polyurethane Acrylate	Fast curing, high strength, good toughness, and excellent grindability.
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
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-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, good toughness, and excellent chemical and wear resistance.
Matte
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-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting, good wetting, and a fine, smooth, and silky hand feel.
B-329D	Aliphatic polyurethane acrylate	Low irritation, low viscosity, excellent wettability, and a pleasant feel.
B-333	Aliphatic polyurethane acrylate	Low viscosity, excellent matting effect, good wetting properties, and excellent flexibility.
B-650A	Aliphatic polyurethane acrylate	Low viscosity, excellent matting effect, fast curing, and good wettability.
Solid-color paint
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-519	Self-curing polyester acrylate	Self-initiated photopolymerization performance
B-530	Polyester acrylate	Low viscosity, excellent hydrophobicity, thixotropy, and improved ink misting
B-560	Polyester acrylate	Fast curing and excellent pigment wetting
Yellowing resistance
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and excellent adhesion.
B-431	Cycloaliphatic Specialty Acrylates	Yellowing resistance, excellent wettability, low viscosity, and fast curing
Dip coating
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-160D	Modified epoxy acrylate	Good flexibility, yellowing resistance, and excellent adhesion.
Roll coating
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-100	Bisphenol A epoxy acrylate	High hardness, high gloss, excellent chemical resistance, and high fullness.
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
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-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost-effectiveness.
Solvent-free spraying
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-251	Aromatic Polyurethane Acrylate	Fast curing, excellent flexibility, and good wetting of black ink pigments.
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability; suitable for LED UV.
LED-UV
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-21C	Active amine photosensitizing promoter	Low color number, antioxidant and polymerization inhibitor, and enhanced curing rate
B-27	Active amine photosensitizing promoter	Low color number, benzene-free, low odor, antioxidant and anti-polymerization
B-570	Polyester acrylate	Low viscosity, benzene-free, low odor, suitable for LED UV
B-574	Polyester acrylate	Benzene-free, low odor, and VOC levels meet cigarette pack standards.
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability; suitable for LED UV.
Excimer lamp
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-241	Aliphatic polyurethane acrylate	Fast curing, excellent skin feel, and yellowing resistance.
Skin feel
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, contains 20% TPGDA
B-165	Modified epoxy acrylate	Good flexibility and strong adhesion
B-241	Aliphatic polyurethane acrylate	Fast curing, excellent skin feel, and yellowing resistance.
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, excellent wettability, and a pleasant hand feel.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting, good wetting, and a fine, smooth, and silky hand feel.
B-574C	Polyester acrylate	Low viscosity, low odor, excellent wettability; suitable for LED UV.
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.
Single-item recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM2223 (TPGDA)	Di(propylene glycol) diacrylate	Good flexibility and low volatility
BM2224 (EO-HDDA)	Ethoxylated 1,6-hexanediol diacrylate	Good adhesion to plastics, good dilutability, 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 excellent chemical resistance.
BM3380 (3EO-TMPTA)	Tripropylene Glycol 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.

Share to:

Technological Innovations in UV Wood Coatings

Analysis of the Physical Properties of UV Wood Coatings