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Key Process Points for Tin-Free UV Resin

Release time:

2026-08-26 06:16

Key Process Points for Tin-Free UV Resin

The key process considerations for tin‑free UV resins encompass systematic control across storage conditions, application methods, and curing parameters. Compared with conventional UV resins, tin‑free formulations contain photoinitiators and, in some cases, are based on aqueous dispersion systems; therefore, during use, particular attention must be paid to critical factors such as temperature management, light‑protected sealing, selection of application techniques, and substrate compatibility. Mastering these process essentials helps ensure consistent product quality and reliable performance in application.

I. Key Points on Storage Conditions

Tin-free UV resins, owing to their highly reactive photoinitiator components, are highly sensitive to storage conditions, which directly affect their stability. Waterborne dispersion products have even stricter storage requirements: the storage temperature must not fall below the specified threshold to prevent freezing, which can compromise emulsion stability. Freezing can lead to demulsification and precipitation of the waterborne resin, irreversibly degrading product performance.

Regarding sealing and light protection, any unused product must be promptly resealed and stored in a closed container; do not leave it open to prevent air and moisture from entering, which could lead to premature polymerization. Store the product in a cool, dry place, away from direct sunlight and heat sources. Under the recommended storage conditions, tin‑free UV‑curable resins exhibit a relatively stable shelf life; however, prolonged storage may result in increased viscosity and reduced curing performance.

II. Construction Method and Coating Key Points

Water-based, tin-free UV dispersions can be applied by spraying, curtain coating, roller coating, and other methods. Some wood‑coating formulations remain non‑tacky before curing, making them well suited for curtain‑coating and roller‑coating operations. Prior to application, adjust the coating viscosity according to the chosen method to prevent sagging caused by excessive thinness or orange‑peel defects resulting from overly thick consistency.

For waterborne systems, after coating, it is essential to ensure that the water evaporates completely; prior to entering the curing zone, the coating temperature must be brought to an appropriate level to achieve optimal film performance. Additionally, waterborne formulations must address substrate wetting issues: due to the relatively high surface tension of the dispersion, wetting agents are typically added to the formulation to prevent surface defects.

III. Control of Curing Conditions

Before curing, waterborne UV‑curable resins require that moisture be thoroughly evaporated; otherwise, residual moisture may cause whitening of the coating or reduced adhesion. Regarding curing temperature, the coating must reach an appropriate temperature prior to entering the curing zone. After curing, the coating exhibits high surface hardness, excellent mechanical strength, and superior chemical resistance.

Coating thickness directly affects the curing performance. Thick coatings require a higher cumulative dose of UV light than thin coatings; for waterborne UV dispersions, dry film thickness is typically kept relatively low, as excessive thickness can lead to inadequate curing or surface defects. High‑functionality systems exhibit high reactivity and low shrinkage, making them well suited for applications demanding high hardness and excellent abrasion resistance.

IV. Substrate Compatibility and System Compatibility

Different types of tin-free UV resins exhibit varying adhesion performance on different substrates. Products designed for hard coatings on plastics can adhere directly to a wide range of plastic substrates, making them suitable for applications in industrial and automotive plastics, consumer electronics, and other fields. Certain bifunctional aliphatic polyurethane acrylates demonstrate excellent adhesion to various plastics, as well as to paper, wood, metals, and other materials.

Waterborne dispersion products are typically formulated with a neutral or slightly alkaline pH and exhibit excellent compatibility with a wide range of photoinitiators. In dual-cure systems, they can be used in combination with waterborne curing agents.

V. Conclusion

The key process parameters for tin‑free UV resins encompass storage conditions, application methods, and curing control. During storage, maintain temperature‑controlled, light‑protected conditions; for waterborne formulations, take precautions against freezing. For application, select spray, curtain coating, or roller coating based on the product type, ensuring adequate evaporation of moisture in waterborne systems. During curing, carefully regulate temperature, energy input, and coating thickness. Rigorous process control is essential to ensure the consistent performance of tin‑free UV resins; each step is interrelated and requires comprehensive management.

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 – Eco-Friendly
Tin-free
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-221X	Aliphatic polyurethane acrylate	Tin-free, fast-curing, and resistant to boiling water.
B-368X	Aliphatic polyurethane acrylate	Tin-free, excellent leveling, bend-resistant, and good heat resistance.
B-6211	Aliphatic polyurethane acrylate	Fast curing, high hardness, scratch-resistant, and free of organotin.
B-919BX	Aliphatic polyurethane acrylate	Tin-free, high hardness, chemically and abrasion-resistant, with excellent toughness.
Benzene-free
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-153	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-21	Active amine photosensitizing promoter	Low color number, benzene-free, antioxidant and polymerization inhibitor, enhances curing rate.
B-27	Active amine photosensitizing promoter	Low color number, benzene-free, low odor, antioxidant and polymerization inhibitor
B-371	Aliphatic polyurethane acrylate	Good surface drying, excellent flexibility, and excellent gloss retention.
B-574	Polyester acrylate	Benzene-free, low-odor, and VOC levels meet cigarette-packaging standards.
Low MEHQ
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-151DM	Modified epoxy acrylate	Low halogen, yellowing-resistant, excellent plating performance, and strong adhesion.
B-376	Aliphatic polyurethane acrylate	LED yellowing is minimal, and the nail polish formulation exhibits excellent stability.
BM1211 (HPMA)	Hydroxypropyl methacrylate	HEMA-free, high strength, low irritation, and excellent adhesion
Bio-based
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-106	Acrylated epoxidized soybean oil resin	The pigment exhibits excellent wettability and is biodegradable after curing.
B-296SW	Aliphatic polyurethane acrylate	Yellowing resistance, impact resistance, bio-based content > 40%
BM3384 (3PO-GPTA)	Propylene glycol triacrylate	Good flexibility, low irritation, and excellent pigment wetting.
No TMPTA
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-151DM	Modified epoxy acrylate	Low halogen, yellowing-resistant, excellent plating performance, and strong adhesion.
B-153	Modified epoxy acrylate	Good flexibility, excellent pigment wetting, and strong adhesion.
B-162	Epoxy acrylate	Fast curing, low odor, high gloss, and high fullness.
B-166A	Modified epoxy acrylate	Good flexibility and strong adhesion
B-166A-85	Modified epoxy acrylate	Good flexibility, excellent adhesion, contains 15% HEMA.
B-166A-85P	Modified epoxy acrylate	Good flexibility, excellent adhesion, contains 15% HEMA.
B-207X	Aliphatic polyurethane acrylate	Medium molecular weight, low odor, and excellent flexibility.
B-27	Active amine photosensitizing promoter	Low color number, benzene-free, low odor, antioxidant and polymerization inhibitor
B-296	Aliphatic polyurethane acrylate	Fast curing, chemical resistance, yellowing resistance, impact resistance
B-376	Aliphatic polyurethane acrylate	LED yellowing is minimal, and the nail polish formulation exhibits excellent stability.
B-412T-6	Aliphatic polyurethane acrylate	Good toughness, free of organotin compounds, and excellent stability of the nail polish formulation.
B-546	Polyester acrylate	Good adhesion, fast curing, and excellent flexibility.
B-619W	Aliphatic polyurethane acrylate	Fast curing, high hardness, excellent toughness, wear resistance, and chemical resistance.
No HEMA
Product Model/English Abbreviation	Product Name/Product Type	Product Features
B-151DM	Modified epoxy acrylate	Low halogen, yellowing-resistant, excellent plating performance, and strong adhesion.
B-162	Epoxy acrylate	Fast curing, low odor, high gloss, and high fullness.
B-207X	Aliphatic polyurethane acrylate	Medium molecular weight, low odor, and excellent flexibility.
B-27	Active amine photosensitizing promoter	Low color number, benzene-free, low odor, antioxidant and polymerization inhibitor
B-296	Aliphatic polyurethane acrylate	Fast curing, chemical resistance, yellowing resistance, impact resistance
B-376	Aliphatic polyurethane acrylate	LED yellowing is minimal, and the nail polish formulation exhibits excellent stability.
B-412T-6	Aliphatic polyurethane acrylate	Good toughness, free of organotin compounds, and excellent stability of the nail polish formulation.

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Common Questions About Tin-Free UV Resins

Curing requirements for tin-free UV resin