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Formulation Differences Among Various Types of UV-Curable PCB Inks

Release time:

2025-08-14 17:09

Formulation Differences Among Various Types of UV-Curable PCB Inks
Formulation Differences Among Various Types of UV-Curable PCB Inks

In the field of PCB (printed circuit board) manufacturing, UV‑curable inks are highly favored for their efficiency, environmental friendliness, and superior physicochemical properties. However, selecting the appropriate formulation for different types of UV‑curable PCB inks requires careful consideration of multiple factors to ensure optimal printing quality and curing performance. This article offers practical guidance on formulation selection for several major categories of UV‑curable PCB inks.

I. UV-Photocurable Solder Mask Ink Formulation

Pigment selection:

Lightfast, heat‑resistant, and chemically stable pigments should be selected; these pigments must maintain color stability under harsh conditions while exhibiting excellent dispersibility, ensuring that the ink yields a vibrant, uniform color after curing.

Binder selection:

The vehicle should exhibit good compatibility with the pigments; high‑adhesion resins are typically selected to enhance ink adhesion on PCB substrates and ensure optimal flow and printability during the printing process.

Photopolymerization initiator:

An efficient and stable photoinitiator is essential, as it ensures rapid curing of the ink under UV irradiation, thereby enhancing production efficiency.

Addition of adjuvants:

Adding appropriate amounts of leveling agents, defoamers, and other auxiliaries helps enhance the ink’s printability and curing performance while reducing printing defects.

II. UV Thermosetting Ink Formulation

Resin Selection:

The primary constituent should be a thermosetting resin, which, upon heating, rapidly forms a hard, durable coating that imparts excellent wear resistance and scratch resistance to the PCB.

Pigments and Curing Agents:

Pigment selection should take into account lightfastness, heat resistance, and chemical resistance; meanwhile, an appropriate amount of curing agent should be added to promote the resin’s crosslinking reaction during heating, thereby enhancing both the rate and extent of cure.

Solvent selection:

The solvent must exhibit excellent solvency, evaporate rapidly to ensure swift drying of the ink during printing, and minimize adverse impacts on both the printing equipment and the environment.

III. UV Character Ink Formulation

Pigment selection:

High-opacity, vivid‑colored pigments should be selected to ensure that printed characters remain clearly legible and to provide excellent abrasion resistance, preventing wear during use.

Binder and photoinitiator:

The vehicle must exhibit good compatibility with the pigments, excellent flow properties, and a certain degree of flexibility; likewise, the photoinitiator should be highly efficient and stable to ensure rapid curing of the ink under UV irradiation.

Additive Usage:

Add thickeners, leveling agents, and other additives as needed to enhance the ink’s printability and curing performance, thereby ensuring high-quality character printing.

IV. Photosensitive Etching Ink Formulation

Pigments and Binders:

The pigment must exhibit high lightfastness, heat resistance, and chemical resistance to ensure color stability during the etching process; the binder should possess excellent photosensitivity and good compatibility with the pigment to guarantee ink uniformity and etching precision.

Photosensitizer Selection:

An efficient and highly sensitive photosensitizer is essential, as it can rapidly undergo a chemical reaction under specific illumination conditions to produce a well-defined etching pattern.

Solvents and Additives:

The solvent must be selected with consideration for its solubility toward resins and pigments, as well as its impact on the photoresist reaction; appropriate amounts of leveling agents, defoamers, and other additives should be incorporated to enhance the ink’s printability and etching performance.

V. Summary

The formulation of UV‑curable PCB inks is a multifaceted process that requires careful consideration of various factors and flexible adaptation to specific application scenarios and requirements. As the electronics industry continues to evolve, the performance demands on UV‑curable PCB inks will only grow more stringent. In the future, through ongoing formulation optimization and advancements in manufacturing processes, these inks will assume an even more pivotal role in PCB fabrication, driving improvements in product performance while reducing costs. At the same time, environmental sustainability will emerge as a key focus in the development of UV‑curable PCB inks, facilitating the electronics industry’s transition toward greener practices.

Disclaimer: The above content has been compiled from publicly available sources and is provided for reference only. If any infringement occurs, please contact us, and we will address it promptly.

Bossin Related Product Recommendations – Solder Mask Ink
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-191A Phenolic epoxy acrylate Fast curing and excellent heat resistance
B-196S Modified o‑methylphenol‑formaldehyde epoxy acrylate Fast curing, excellent heat resistance, and superior development performance.
BM3231 (TMPTA) Trimethylolpropane triacrylate High crosslink density, high hardness, high gloss, and excellent wear resistance.
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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