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Key Considerations for Using Bio-based UV Resins

Release time:

2026-09-01 06:34

Key Considerations for Using Bio-based UV Resins

Bio-based UV resins replace petroleum-derived feedstocks with renewable resources, reducing the carbon footprint while retaining the rapid curing advantages of UV curing. However, compared with petroleum-based UV resins, bio-based systems have specific requirements regarding storage conditions, application processes, and cure control. Properly addressing these factors is essential for ensuring consistent resin performance and product quality.

I. Key Points on Storage Conditions

Bio-based UV resins have specific requirements for storage conditions. Most products should be stored sealed in a suitable indoor environment, protected from direct sunlight. Low temperatures may cause waterborne bio-based resins to freeze and lose their emulsion stability, while high temperatures can accelerate the pre-polymerization of photoinitiators.

Under recommended storage conditions, bio-based UV resins exhibit a relatively stable shelf life. However, the shelf life varies among products with different formulations; before use, verify that the product has not exceeded its expiration date, as prolonged storage may lead to increased viscosity and reduced curing performance.

Before use, thoroughly shake the resin to ensure uniform distribution of all components. After application, seal the container promptly to prevent activation of the photoinitiator, which could lead to premature curing.

II. Key Points of Construction Technology

Waterborne bio-based UV resins must undergo thorough pre‑drying prior to UV curing to remove moisture from the system. Formulations of this type require a pre‑drying step after coating; only after the moisture has evaporated can they proceed to the curing stage. Insufficient pre‑drying may result in whitening of the cured coating or reduced adhesion.

During application, the appropriate coating method should be selected based on the specific product type. Waterborne bio-based UV dispersions can be applied by spraying, curtain coating, or roller coating, among other methods. Prior to application, the coating viscosity should be adjusted according to the chosen method to prevent sagging caused by excessive thinness or orange‑peel defects resulting from excessive thickness.

When formulating the system, the choice of photoinitiator must be matched to the reactivity of the resin matrix. Bio-based acrylates can effectively participate in free-radical photopolymerization, and various types of photoinitiators are suitable; the specific dosage should be determined based on the resin’s light transmittance and the desired curing requirements.

III. Key Points for Curing Control

Bio-based UV resins retain the core advantage of rapid curing under ultraviolet light. Acrylate resins synthesized from vegetable oils exhibit fast curing upon UV irradiation, and their curing efficiency is further enhanced when compounded with multifunctional monomers. Some bio-based systems also possess dual-curing characteristics: UV exposure first induces preliminary crosslinking, while a subsequent thermal curing stage modulates the crosslink density via dynamic bond‑exchange reactions.

For thick coatings or dark‑colored systems, it is important to address the issue of limited UV penetration. A stepwise curing strategy can be employed: first apply a low‑energy pre‑cure to form a surface skin, followed by a high‑energy cure to achieve deep‑layer crosslinking, ensuring complete curing throughout the coating from surface to core. In dark‑colored systems, it may be necessary to increase the photoinitiator dosage or extend the curing time to overcome the competitive absorption of UV light by the pigments.

IV. Key Safety Operating Points

Although bio-based UV resins are environmentally friendly, the uncured resin remains photosensitive and must be handled in accordance with safety regulations. Operators should wear protective gloves and goggles to prevent direct skin contact with the uncured resin. Even though some plant‑based resins have a milder odor than conventional resins, adequate ventilation is still essential in printing and coating areas. Waste resin and cleaning waste liquids must be disposed of in compliance with chemical waste disposal regulations.

V. Conclusion

Key considerations for the use of bio-based UV resins encompass four aspects: storage, application, curing, and safe handling. During storage, maintain temperature control and protect from light, while carefully managing shelf life; in application, ensure thorough pre‑drying for waterborne systems and select photoinitiators that are compatible with the resin formulation; during curing, adopt either staged curing or dual‑cure strategies as needed; and when handling, wear appropriate personal protective equipment and ensure adequate ventilation. As bio-based UV resin technology continues to advance, its process window and process adaptability will 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.

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