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Performance of UV Wood Primer

Release time:

2026-03-25 17:22

Performance refers to the technical specifications and functional capabilities demonstrated by a product during its use. For UV wood primers, performance encompasses such aspects as the quality of the cured film, adhesion to the substrate, and environmental adaptability. These performance indicators directly determine the quality and service life of the coating system.

I. Physical Properties

1. Hardness

After curing, UV wood primers form a highly crosslinked polymer network, resulting in a coating with high hardness. This property enables the primer layer to resist indentation and scratching, providing a robust substrate for the topcoat. The degree of hardness is closely related to the type of resin used in the formulation and the crosslinking density.

2. Adhesion

Adhesion is a critical performance indicator for assessing the bond strength between a primer and a wood substrate. UV wood primers achieve robust adhesion through two mechanisms: first, mechanical anchoring, in which the liquid coating penetrates the micro-pores and inter-fiber spaces on the wood surface and, upon curing, forms an interlocking structure; second, chemical bonding, whereby polar functional groups in the resin molecules interact with active functional groups on the wood fiber surface. Together, these two mechanisms ensure strong adhesion between the primer and the substrate.

3. Flexibility

Wood undergoes dimensional changes during service due to fluctuations in ambient temperature and humidity. UV wood primers must possess appropriate flexibility to accommodate these deformations. Through rational formulation of the resin system, the coating maintains a certain degree of hardness while exhibiting sufficient elasticity, enabling it to deform in concert with the wood substrate and thereby preventing cracking or delamination caused by stress concentration.

4. Wear Resistance

The coating formed by UV wood primer upon curing exhibits excellent abrasion resistance. This property enables the coating system to withstand everyday friction and scratching over long-term use, thereby maintaining the integrity of the coating. The level of abrasion resistance is directly related to the crosslinking density and surface hardness of the coating.

II. Chemical Properties

1. Water Resistance

After curing, the UV-cured wood primer forms a dense crosslinked network that provides excellent barrier properties against moisture. The coating effectively prevents the penetration of liquid water and the transmission of water vapor, thereby protecting the wood substrate from moisture-induced degradation. This performance is particularly critical for wood products exposed to humid environments over extended periods.

2. Chemical Resistance

Due to the formation of a highly crosslinked polymer network, the cured coating of the UV wood primer exhibits excellent resistance to a wide range of chemicals, including organic solvents, common household cleaners, and acidic or alkaline solutions. Upon exposure to these substances, the coating does not swell, soften, or dissolve, thereby maintaining its integrity and protective performance.

3. Yellowing Resistance

Yellowing resistance refers to the ability of a coating to maintain color stability under prolonged exposure to light. UV wood primers are formulated with resins and additives that exhibit excellent photostability; upon curing, the resulting coating effectively resists the damaging effects of ultraviolet radiation and does not undergo molecular structural changes that lead to yellowing or discoloration when exposed to light. This property is particularly important for light-colored and clear finishes.

III. Sealing Performance

Sealant performance is the core performance indicator that distinguishes primers from topcoats. After curing, UV wood primers form a dense coating that effectively inhibits the migration of substances from within the wood. This includes preventing moisture from diffusing outward through capillaries, blocking the exudation of natural components such as pine resin and tannins, and suppressing the release of volatile compounds from the wood. Excellent sealant performance ensures that the topcoat remains unaffected by internal wood factors.

IV. Polishing Performance

Abrasion performance refers to the characteristics exhibited by a coating during sanding. After UV wood primer has cured, the resulting coating possesses moderate hardness and excellent sandability. Following sanding, the coating surface develops a uniform matte texture, with further improvement in surface smoothness. Moreover, during the sanding process, the coating is less prone to issues such as sand sticking, powdering, or overheating and melting, thereby ensuring both the efficiency and quality of the sanding operation.

V. Thermal Performance

1. Heat resistance

After curing, the UV wood primer forms a coating with notable heat resistance, maintaining stable performance over a specified temperature range. The coating does not soften, deform, or decompose when exposed to heat, thereby ensuring the reliability of the coating system under high-temperature conditions.

2. Dimensional Stability

After curing, the UV-cured wood primer forms a coating with a low coefficient of linear thermal expansion that closely matches that of the wood substrate. This property enables the coating to expand and contract in concert with the wood under temperature fluctuations, thereby reducing the risk of cracking or delamination caused by thermal stress.

VI. Conclusion

The performance of UV wood primers encompasses a wide range of aspects, including physical and mechanical properties, chemical resistance, sealing capability, sandability, and thermal stability. These performance parameters are interrelated and collectively determine the overall quality of the coating system. A thorough understanding of these properties facilitates informed material selection and process design, thereby ensuring the reliability and durability of coated products.

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Boxing 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
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.

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