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How to Address Defects in UV 3C Coatings (Part 11)
In the practical production of UV 3C coatings, sagging is one of the common defects that compromise the uniformity of coating thickness. It manifests as downward flow of the coating on vertical surfaces, resulting in an uneven film—thick in some areas and thin in others. Sagging not only compromises the aesthetic consistency of the coating but can also lead to localized film‑thickness exceedances, potentially triggering additional issues such as incomplete curing. To address this defect, appropriate measures must be taken, including controlling spray‑applied film thickness, adjusting coating viscosity, and selecting suitable diluents. This paper outlines methods for mitigating sagging by focusing on adjustments to the spraying process, management of coating condition, and control of the application environment.
2026-07-03
How to Address Defects in UV 3C Coatings (Part 10)
Among the various defects in UV‑3C coatings, poor adhesion is a serious issue that compromises coating reliability. It manifests as easy delamination of the paint film from the substrate—often removable with a simple tape test—indicating insufficient interfacial bonding strength between the coating and the substrate. Adhesion is the foundation for the coating’s protective performance; inadequate adhesion directly leads to failure of the coating’s protective function. To address this defect, appropriate measures must be taken across multiple aspects, including substrate cleaning, surface activation treatments, control of curing conditions, and compatibility of coating formulations. This paper outlines strategies for mitigating poor adhesion by focusing on pre‑treatment process optimization, substrate surface modification, adjustment of curing parameters, and matching of coating systems.
2026-07-03
How to Address Defects in UV 3C Coatings (Part 9)
In the practical production of UV‑3C coatings, curing shrinkage marks represent a rather unique type of surface defect. They arise during ultraviolet curing when uneven shrinkage of the coating film generates textured surface irregularities—distinct from leveling issues such as orange peel or craters—and stem from volumetric changes that occur during the curing reaction. These shrinkage marks not only compromise the product’s appearance but may also adversely affect the long-term durability of the coating. Addressing this defect requires targeted measures across multiple dimensions, including coating formulation design, control of coating thickness, and optimization of the curing process. This paper outlines approaches to mitigating curing shrinkage marks by examining resin system selection, coating‑thickness management, exposure‑energy adjustment, and stress‑relief design.
2026-07-03
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Bossin cordially invites you to visit the 2025 China International Coatings Exhibition.
UV monomer with a curing speed more than 30% faster than that of trifunctional monomers
Low-irritation version of HDDA
A high-refractive-index UV monomer
Although it’s quite ordinary, it offers great value for the price.
A UV monomer used in fields such as PCB ink, UV curing agents, and offset printing ink.
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