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How to evaluate the performance of UV wood primer
Release time:
2026-03-27 07:11
In wood coating production, the quality of UV wood primers directly affects the final performance and service life of the entire coating system. However, since the primer layer is covered by the topcoat, its properties cannot be directly observed or assessed with the naked eye. Therefore, it is essential to establish a scientific and systematic approach for performance evaluation, enabling objective testing and quantitative analysis of all relevant primer performance indicators. This paper will introduce the commonly used methods for evaluating the performance of UV wood primers from the perspectives of curing performance, physical properties, chemical properties, sealing performance, application performance, and environmental protection performance.
I. Evaluation of Curing Performance
Curing performance is the most fundamental performance indicator for UV wood primers. The commonly used evaluation method is the curing-speed test: the coating is applied to a substrate and exposed to ultraviolet light of varying energy levels, with the degree of complete cure assessed by tactile inspection or by wiping with a cotton swab. The lower the energy required to achieve complete cure, the higher the coating’s curing-reactivity.
For opaque primers, it is also necessary to evaluate the cure depth. The coating is applied to a mold of a specified thickness; after irradiation, the thickness of the cured layer is measured to determine the feasibility of thick-coat application.
II. Evaluation of Physical Properties
Hardness testing is typically conducted using the pencil hardness method, in which pencils of varying hardness are drawn across the coating surface; the highest pencil hardness that does not cause penetration or damage to the coating is taken as the test result. This parameter reflects the primer’s resistance to indentation by external forces.
The most commonly used adhesion test is the grid-cut method, in which a grid is cut into the coating surface using a grid cutter, adhesive tape is applied and then peeled off, and the proportion of the coated area that has detached is observed. The smaller the detached area, the better the adhesion.
Flexibility is assessed using the cylindrical bending test, in which a coated test panel is wrapped around cylinders of varying diameters to determine whether the coating cracks; the smallest cylinder diameter at which no failure occurs is taken as the flexibility rating. This parameter reflects the primer’s ability to accommodate wood deformation.
III. Chemical Performance Evaluation
The water resistance test involves immersing a coated test panel in room-temperature water and, after a specified duration, observing whether the coating exhibits blistering, whitening, or softening. A coating with good water resistance shows no significant changes after immersion.
Chemical resistance testing is conducted using the spot-test method: filter paper soaked in the test solution is placed on the coated surface, and the changes in the coating are observed after a specified period. Common test media include ethanol, detergents, coffee, edible oil, and other chemicals encountered in everyday use.
The yellowing resistance test involves exposing coated test panels to an accelerated aging environment in a UV aging chamber and periodically measuring the color difference of the coating; the smaller the color change, the better the yellowing resistance.
IV. Evaluation of Sealing Performance
The evaluation of sealing performance primarily focuses on the primer’s ability to inhibit the migration of internal wood constituents. For tannin-rich woods, after applying a primer and then coating with a white topcoat, the topcoat is subjected to high-temperature, high-humidity conditioning, and the extent of yellowing in the topcoat is observed to assess the primer’s effectiveness in sealing pigments. For oil-rich woods, following coating application, the sample is exposed to high-temperature treatment, and the coating surface is examined for the appearance of oil spotting or exudation to determine the primer’s capacity to seal oils.
V. Construction Performance Evaluation
Leveling performance is assessed visually by observing whether the coating spreads evenly on its own after application to form a smooth, uniform surface and whether any obvious application marks remain.
Abrasion resistance is evaluated by sanding the cured primer coat with sandpaper and observing the ease of sanding, the characteristics of the dust generated, and the smoothness of the sanded surface. Good performance is indicated by easy sandability, fine dust, and a smooth surface.
VI. Environmental Performance Evaluation
The determination of volatile organic compound content is a core indicator for evaluating environmental performance; gas chromatography is used to measure the total amount of volatile organic compounds in coatings. The lower the content, the better the environmental performance.
The determination of residual monomer content is used to evaluate the amount of unreacted monomers remaining in the cured coating; quantitative analysis is performed using chromatographic methods. The lower the residual monomer content, the higher the product’s safety.
VII. Conclusion
The performance evaluation of UV wood primers primarily involves testing aspects such as curing performance, physical properties, chemical properties, sealing performance, application performance, and environmental protection performance. Each of these evaluation categories has specific test methods and acceptance criteria; systematic testing enables a comprehensive assessment of the primer’s performance level, providing a basis for product selection and quality control.
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.
| Boxing Recommended Products – UV Wood Coatings |
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| Putty primer |
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| 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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