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How to Control the Coating Quality of UV Wood Primer
Release time:
2026-04-01 07:00
The quality of the UV wood primer coating directly affects the performance and service life of the entire coating system. However, since the primer layer is covered by the topcoat, quality issues in the primer often go undetected until later stages of the process, leading to rework and material waste. Therefore, establishing a comprehensive quality-control system that maintains rigorous oversight from raw-material receipt through to finished-product inspection is essential for ensuring consistent coating quality. Quality control is implemented across three key stages—incoming-material inspection, in-process control, and final-product inspection—each with its own specific control points and methodologies.
I. Raw Material Inspection
Quality inspection of primer upon arrival at the factory is the first critical checkpoint in quality control. Only by ensuring that raw materials meet the specified requirements can subsequent production be reliably assured.
1. Viscosity Testing: Viscosity testing is a commonly used inspection method. The viscosity of the coating is measured using a viscosity cup or a rotational viscometer to determine whether it falls within the specified range. Viscosity that is too high or too low can adversely affect coating application and film performance.
2. Solid Content Testing: Solid content testing involves heating and drying the coating under specified conditions to measure the mass fraction of the residue, thereby determining the solid content of the coating. The stability of the solid content directly affects the coating application rate and material costs.
3. Curing Speed Test: This test involves applying the coating to a small sample, then exposing it to ultraviolet light to observe the curing progress and determine whether the curing reaction activity is within the normal range. Curing that is too fast or too slow can both adversely affect production efficiency and the quality of the cured film.
II. Process Control
Quality control throughout the production process is the core element in ensuring coating stability. By monitoring and adjusting critical process parameters, deviations can be promptly identified and corrected, thereby preventing the occurrence of batch-quality issues.
1. Coating Weight Control: Coating weight control is a critical aspect of process control. By adjusting equipment parameters and regulating the coating supply, the coating weight per unit area is maintained within the specified range. Insufficient coating can result in inadequate sealing or incomplete fill, while excessive coating may lead to sagging, incomplete curing, and increased costs. During production, the weight of workpieces should be periodically measured before and after coating to monitor the stability of the coating weight.
2. Curing Energy Control: Curing energy control involves monitoring the output energy of the UV lamp to ensure that the irradiation energy meets the curing requirements. Insufficient energy may result in incomplete curing, with a sticky coating surface and an uncured interior; excessive energy, on the other hand, can lead to yellowing and embrittlement of the coating. The lamp output should be regularly measured with an energy meter to maintain stable curing energy.
3. Sanding Quality Control: Sanding quality control involves inspecting the flatness and roughness of the sanded surface to ensure it meets the requirements for subsequent coating applications. Insufficient sanding can compromise the smoothness of the topcoat, while excessive sanding may abrade through the primer layer. The sanding finish should be evaluated visually and by touch; where necessary, a profilometer should be used for quantitative measurement.
III. Finished Product Inspection
After coating is completed, the primer layer must undergo quality inspection to verify that the product meets the specified requirements, thereby providing a reliable guarantee for subsequent topcoat application.
1. Visual Inspection: Visual inspection involves visually examining the coating surface under appropriate lighting conditions to identify defects such as sagging, orange-peel texture, bubbles, particulates, and areas with incomplete coating. Such visual defects not only affect the aesthetic appearance but may also compromise the protective performance of the coating.
2. Adhesion Test: The adhesion test is conducted using the grid-cut method, in which a grid is scored into the coating surface with a grid cutter, followed by application of adhesive tape and subsequent removal to assess the percentage of the coated area that has peeled off. Adhesion is a critical parameter for evaluating the bond strength between the primer and the substrate, directly impacting the service life of the coating system.
3. Sandability Test: The sandability test is conducted by performing actual sanding operations to evaluate whether the primer coat exhibits good sanding performance. Good performance is characterized by ease of sanding, fine dust generation, and no sticking to the sandpaper. Sandability directly affects production efficiency and the adhesion of subsequent topcoats.
IV. Conclusion
Quality control of UV wood primers is a systematic undertaking that encompasses incoming material inspection, in-process control, and final product inspection. Incoming material inspection ensures that raw materials meet specified requirements; in-process control guarantees the stability of production processes; and final product inspection verifies the ultimate quality level. These three stages are interrelated and build upon one another, together forming a comprehensive quality-control system. In actual production, all inspection and control measures must be rigorously implemented to promptly identify and resolve issues, thereby ensuring the consistency and reliability of primer coating quality.
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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, 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-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, containing 20% TPGDA |
B-160D | Modified epoxy acrylate | Good flexibility, yellowing resistance, and strong 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, containing 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 | Excellent adhesion, rapid curing, and good 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 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. |
B-529 | Polyester acrylate | Excellent adhesion, low shrinkage, and good resin compatibility. |
B-560 | Polyester acrylate | Fast curing and excellent pigment wetting |
Individual 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 | Excellent 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) | Ethoxylated trimethylolpropane 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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