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Characteristics of Tin-Free UV Resin

Release time:

2026-08-21 06:34

Organotin compounds were long used as effective catalysts in the synthesis of polyurethane UV resins, but their endocrine-disrupting effects have drawn widespread concern. Against the backdrop of increasingly stringent environmental regulations, tin‑free UV resins are emerging as a green alternative and are gradually becoming an industry trend. These resins not only maintain catalytic efficiency but also address the health risks associated with organotins at the formulation level, while simultaneously incorporating additional eco‑friendly attributes such as water‑based formulations, low VOC content, and bio‑based components—representing a key direction in the technological advancement of UV resin systems.

I. Tin-Free—Eliminating the Health Risks of Organotin Compounds

Traditional synthesis of polyurethane UV resins relies on organotin catalysts to promote the reaction between isocyanates and hydroxyl groups. However, organotin compounds have been shown to exert potential endocrine-disrupting effects in humans and are listed as substances of very high concern under relevant regulations.

Tin-free UV resins employ an alternative catalytic system to accelerate polyurethane curing, completely eliminating the need for organotin compounds. By optimizing the synthesis process, these formulations deliver excellent substrate adhesion, outstanding flexibility, and low yellowing, while also complying with environmental regulations and VOC emission limits.

In terms of catalytic alternatives, environmentally friendly catalysts can now replace organotin compounds in the synthesis of UV‑curable resins, exhibiting catalytic activity comparable to that of organotin. The resulting resin products exhibit excellent transparency and a light color.

II. Water-Based Formulations and Low VOC Emissions

Tin-free UV resins typically exist as aqueous dispersions, combining the dual environmental benefits of being tin-free and water-based. The use of aqueous systems ensures that these UV resins release virtually no harmful volatile organic compounds during application. Coupled with a tin-free, eco‑friendly formulation, such products enable truly green coatings and find applications in consumer electronics, automotive interiors, cosmetic packaging, plastic sheets, and flooring materials.

III. Bio-based and Sustainable Properties

Some tin-free UV resin products also incorporate bio-based components, further enhancing their environmental sustainability. While delivering excellent chemical and mechanical performance, these formulations are easy to apply; their high reactivity boosts production efficiency, and they generate extremely low VOC emissions.

IV. Excellent Coating Performance

Tin-free UV resins enhance environmental sustainability without compromising coating performance. High‑functionality tin-free polyurethane acrylates exhibit excellent scratch resistance, wear resistance, and hardness, while maintaining good flexibility.

In plastic hard-coating applications, tin-free waterborne UV dispersions exhibit the following characteristics: they can adhere directly to a wide range of plastic substrates; they strike an excellent balance between hardness and flexibility, thereby reducing coating brittleness; they demonstrate superior resistance to humidity‑heat, abrasion, and hot water; they deliver high gloss and low haze; and they exhibit minimal yellowing upon curing.

V. Rapid Curing and Energy-Saving Properties

Tin-free UV resins retain the core advantages of rapid UV curing. Some formulations, while maintaining eco‑friendly properties, also exhibit high reactivity, helping to boost production efficiency. When combined with LED‑UV curing technology, they enable fast curing under low‑energy conditions, further reducing the carbon footprint of the coating process.

VI. Conclusion

Environmentally friendly tin‑free UV resins address the health risks associated with organotin compounds by replacing traditional catalytic systems, while simultaneously incorporating eco‑friendly attributes such as water‑based formulation, low VOC content, and bio‑based components. These resins have established well‑developed application frameworks in sectors including consumer electronics, automotive interiors, cosmetic packaging, and plastic coatings. High‑functionality, tin‑free polyurethane acrylates deliver performance in scratch resistance, hardness, and flexibility that rivals that of their tin‑containing counterparts. As environmental regulations continue to tighten and alternative catalytic technologies mature, the scope of applications for tin‑free UV resins is expected to expand further.

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, excellent flex resistance, 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 photosensitizer	Low color number, benzene-free, antioxidant and polymerization inhibitor, enhances curing rate.
B-27	Active amine photosensitizer	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 upon 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 photosensitizer	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 photosensitizer	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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Physical Properties of Tin-Free UV Resin

Types of Eco-Friendly UV Resins