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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 via ultraviolet light initiation, possess chemical characteristics that give them unique advantages in the field of wood finishing for furniture, flooring, and other wooden products. This coating is centered around key components—including photopolymer resins, reactive monomers, photoinitiators, and additives—and achieves a balance between efficient curing and outstanding performance through precise chemical design, while also meeting the dual demands of modern industry for both environmental friendliness and efficiency.

I. Chemical Synergy of Core Components

The chemical formulation of UV wood coatings consists of four major categories of ingredients, each of which achieves complementary functionality through synergistic interactions at the molecular level.

Photosensitive resin serves as the backbone of the coating, with unsaturated double-bond structures at the ends of its molecular chains. When exposed to ultraviolet light, these double bonds can undergo crosslinking reactions with the double bonds in reactive monomers, forming a dense three-dimensional network structure. Epoxy acrylates and polyurethane acrylates are two major types 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 chain segments.

The active monomer serves as both a solvent and a crosslinking agent. The number of double bonds in its molecule directly affects the curing speed and the crosslinking density of the coating: polyfunctional monomers can significantly enhance the coating’s hardness, but their increased viscosity must be carefully balanced; monofunctional monomers, on the other hand, are used to adjust the system’s fluidity and ensure smooth application.

A photoinitiator is a chemical switch that triggers UV curing. Upon absorbing ultraviolet light energy, the photoinitiator molecule undergoes cleavage, generating free radicals or cations, which in turn initiate the polymerization reaction between the resin and monomers. Free-radical photoinitiators dominate due to their high reaction efficiency, while cationic photoinitiators are suited for specific resin systems and offer the advantage of lower volumetric shrinkage.

The additive system optimizes construction performance by regulating rheology and surface properties. Leveling agents reduce surface tension, eliminating orange peel and pinholes; defoamers inhibit the formation of air bubbles during application; light stabilizers delay yellowing of the coating; and nano-fillers enhance hardness while maintaining transparency. These additives bond with the main components through intermolecular forces or chemical bonds, forming a stable chemical system.

II. The Chemical Nature of Light-Initiated Chain Polymerization

The curing process of UV wood coatings is essentially a chain polymerization reaction initiated by a photoinitiator, and its chemical mechanism can be divided into three stages.

In the initial stage, after absorbing ultraviolet light energy, the photoinitiator molecule transitions from its ground state to an excited state. Subsequently, homolytic or heterolytic cleavage occurs, generating highly reactive free radicals or cations. These active species serve as the starting point for the polymerization reaction, and their stability directly affects the curing efficiency.

During the chain-growth stage, free radicals or cations attack the double bonds in the resin and monomer molecules, forming new active centers and initiating chain growth. As the reaction proceeds, molecular chains crosslink via their double bonds, forming a three-dimensional network structure, and the coating transitions from a liquid to a solid state. In this process, the chemical structures of the resin and monomer determine the crosslinking density, which in turn affects the coating’s hardness and flexibility.

During the post-curing stage, after UV irradiation is stopped, unreacted double bonds may still remain in the coating. By means of thermal treatment or natural aging, these residual double bonds continue to react, further increasing the cross-linking density. Some systems employ a dual-curing approach: by introducing waterborne resins or isocyanate groups, complete curing can be achieved even in shaded areas, thereby ensuring uniform coating performance.

3. Chemical Correlation Between Molecular Structure and Properties

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

A high cross-linking density forms the chemical basis for the coating's hardness. After curing, the double-bond conversion rate within the coating is extremely high, resulting in a dense network structure that endows the coating with outstanding abrasion resistance and scratch resistance. This structural characteristic makes the coating less prone to plastic deformation under external forces, thereby maintaining its surface smoothness.

The flexibility and impact resistance of the coating stem from the chemical design of its resin molecular chains. By incorporating flexible segments such as polyether or polyester chains, it’s possible to increase the freedom of movement of the molecular chains while maintaining a consistent crosslink density. When the coating is subjected to an impact, these flexible segments can absorb energy through deformation, thereby preventing the coating from cracking or peeling off.

Adhesion is the result of interfacial chemical interactions. Polar groups in the photosensitive resin molecules can form hydrogen bonds or chemical bonds with cellulose and lignin in wood, thereby enhancing the strength of the interfacial bond. This chemical bonding ensures that the coating remains firmly adhered even under humid conditions or when subjected to temperature fluctuations, thus minimizing the risk of delamination.

IV. Chemical Implementation of Environmental Protection Properties

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

The solvent-free volatilization characteristic is at the heart of its environmental friendliness. The curing process involves only intermolecular cross-linking reactions, with no need for solvent evaporation, thereby keeping volatile organic compound emissions at an extremely low level. Water-based UV systems further replace organic solvents with water, achieving nearly zero VOC emissions and meeting indoor air quality standards.

The low-toxicity of photoinitiators is crucial for ensuring safety. Traditional photoinitiators may leave behind harmful substances such as benzene. Modern systems, however, optimize molecular structures and employ low-migration photoinitiators like acyl phosphine oxides, thereby keeping the residual levels of these harmful substances within safe limits and guaranteeing health and safety during both construction and use.

The energy efficiency advantage stems from its rapid curing properties. UV curing consumes far less energy than thermal curing, and the curing time is reduced to seconds, significantly lowering production energy consumption. The use of LED light sources further reduces electricity usage while also eliminating ozone pollution caused by conventional mercury lamps, thus enabling clean production.

V. Conclusion

The chemical properties of UV wood coatings are the foundation of their performance advantages and environmental benefits. Through the precise formulation of photoreactive resins, reactive monomers, photoinitiators, and additives, combined with the rapid reaction mechanism of photoinitiated chain polymerization, these coatings achieve a perfect balance between physical properties—such as hardness, flexibility, and adhesion—and environmental friendliness. 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 sustainability.

Boxing Related Product Recommendation – UV Wood Coating
Putty primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 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 performance.
Sanding primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 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 performance.
Adhesion primer
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-02	Phosphate ester acrylate	Enhance adhesion to substrates such as metal, glass, and plastic.
B-05	Phosphate ester acrylate	Enhance adhesion to substrates such as metal, glass, and plastic.
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA.
B-165	Modified epoxy acrylate	Good flexibility and good adhesion
B-522	Polyester acrylate	Low shrinkage, excellent flexibility, strong adhesion, and high cost performance.
B-535	Polyester acrylate	Good adhesion, fast curing, excellent 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, containing 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 performance.
B-529	Polyester acrylate	Good adhesion, low shrinkage, and excellent resin compatibility.
B-560	Polyester acrylate	Fast curing, excellent pigment wetting.
Gloss finish paint
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA.
B-163	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-165	Modified epoxy acrylate	Good flexibility and good adhesion
B-21C	Active amine photosensitizer	Low color number, antioxidant and polymerization inhibitor resistance, enhanced curing rate
B-301	Aromatic polyurethane acrylate	Fast curing, good toughness, and excellent sandability.
B-302	Aromatic polyurethane acrylate	Fast curing, high strength, good toughness, and easy to sand.
B-574C	Polyester acrylate	Low viscosity, low odor, good wettability, suitable for LED UV.
B-601	Aromatic polyurethane acrylate	High hardness, scratch-resistant, chemical-resistant, and cost-effective.
B-609	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch-resistant, chemical-resistant
B-868	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
B-868H	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
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 chemical and wear resistance.
Matte finish paint
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 photosensitizer	Low color number, antioxidant and polymerization inhibitor resistance, enhanced curing rate
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, good wettability, and pleasant to the touch.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting effect, good wetting properties, and a fine, smooth hand feel.
B-333	Aliphatic polyurethane acrylate	Low viscosity, good matting effect, excellent wettability, and good flexibility.
B-572	Polyester acrylate	Low viscosity, low odor, good wettability, suitable for LED UV.
B-650A	Aliphatic polyurethane acrylate	Low viscosity, good matting effect, fast curing, and excellent wettability.
B-868	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
B-868H	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
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 chemical and wear resistance.
Bright white paint
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 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 sandability.
B-302	Aromatic polyurethane acrylate	Fast curing, high strength, good toughness, and easy to sand.
B-560	Polyester acrylate	Fast curing, excellent pigment wetting.
B-574C	Polyester acrylate	Low viscosity, low odor, good wettability, suitable for LED UV.
B-601	Aromatic polyurethane acrylate	High hardness, scratch-resistant, chemical-resistant, and cost-effective.
B-868	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
B-868H	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, good toughness, and chemical and wear resistance.
Adherent
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-05	Phosphate ester acrylate	Enhance 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 resistance to yellowing.
B-535	Polyester acrylate	Good adhesion, fast curing, excellent flexibility, and yellowing resistance.
B-546	Polyester acrylate	Good adhesion, fast curing, and excellent flexibility.
B-590	Polyester acrylate	Good adhesion, fast curing, and excellent 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, containing 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 performance.
B-529	Polyester acrylate	Good adhesion, low shrinkage, and excellent resin compatibility.
Retouching
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-560	Polyester acrylate	Fast curing, excellent pigment wetting.
Hardened
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA.
B-301	Aromatic polyurethane acrylate	Fast curing, good toughness, and excellent sandability.
B-302	Aromatic polyurethane acrylate	Fast curing, high strength, good toughness, and easy to sand.
B-560	Polyester acrylate	Fast curing, excellent pigment wetting.
B-574C	Polyester acrylate	Low viscosity, low odor, good wettability, suitable for LED UV.
B-601	Aromatic polyurethane acrylate	High hardness, scratch-resistant, chemical-resistant, and cost-effective.
B-912	Aliphatic polyurethane acrylate	Fast curing, high hardness, good toughness, and chemical and wear resistance.
Matte
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, good wettability, and pleasant to the touch.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting effect, good wetting properties, and a fine, smooth hand feel.
B-329D	Aliphatic polyurethane acrylate	Low irritation, low viscosity, good wettability, and pleasant hand feel.
B-333	Aliphatic polyurethane acrylate	Low viscosity, good matting effect, excellent wettability, and good flexibility.
B-650A	Aliphatic polyurethane acrylate	Low viscosity, good matting effect, fast curing, and excellent 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, 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	Alicyclic Specialty Acrylates	Yellowing-resistant, excellent wettability, low viscosity, fast curing
Coating by spraying
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, chemical resistance, and high fullness.
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 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 good 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 performance.
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 performance on black ink pigments.
B-520	Polyester acrylate	Low viscosity, high gloss, excellent wettability, and cost-effective.
B-574C	Polyester acrylate	Low viscosity, low odor, good 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, containing 20% TPGDA.
B-21C	Active amine photosensitizer	Low color number, antioxidant and polymerization inhibitor resistance, enhanced curing rate
B-241	Aliphatic polyurethane acrylate	Fast drying, excellent skin feel, and resistant to yellowing.
B-27	Active amine photosensitizer	Low color number, benzene-free, low odor, antioxidant and polymerization inhibitor.
B-570	Polyester acrylate	Low viscosity, benzene-free, low odor, suitable for LED UV.
B-574	Polyester acrylate	Benzene-free, low odor, and VOCs meet cigarette packaging standards.
B-574C	Polyester acrylate	Low viscosity, low odor, good wettability, suitable for LED UV.
Excimer lamp
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-241	Aliphatic polyurethane acrylate	Fast drying, excellent skin feel, and resistant to yellowing.
Skin feel
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-113	Bisphenol A epoxy acrylate	High hardness, high gloss, high fullness, containing 20% TPGDA.
B-165	Modified epoxy acrylate	Good flexibility and good adhesion
B-241	Aliphatic polyurethane acrylate	Fast drying, excellent skin feel, and resistant to yellowing.
B-328M	Aliphatic polyurethane acrylate	Low gloss, low viscosity, good wettability, and pleasant to the touch.
B-328R	Aliphatic polyurethane acrylate	Low gloss, excellent matting effect, good wetting properties, and a fine, smooth hand feel.
B-574C	Polyester acrylate	Low viscosity, low odor, good wettability, suitable for LED UV.
B-868	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
B-868H	Silicone-based UV-curable resin	Good leveling, smooth finish, fast curing, and stain-resistant.
Monomer Recommendation
Product Model/English Abbreviation	Product Name/Product Type	Product Features
BM2223/TPGDA	Di(propylene glycol) diacrylate	Good flexibility, low volatility
BM2224/EO-HDDA	Ethoxylated-1,6-hexanediol diacrylate	Good adhesion to plastics, excellent 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 chemical resistance.
BM3380/3EO-TMPTA	Ethoxylated trimethylolpropane triacrylate	More flexible and less irritating than TMPTA.
BM6261/DPHA-80	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and abrasion resistance, and water resistance.
BM6263/DPHA-90	Dipentaerythritol hexaacrylate	High crosslink density, high hardness, chemical and abrasion resistance, and water resistance.

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Technological Innovation in UV Wood Coatings

Analysis of the Physical Properties of UV Wood Coatings