Photoinitiator free UV-curing DirectCure
The direct initiation of polymerization and crosslinking of acrylates by high-energy photons is called photoinitiator free UV-curing. The acrylate molecule itself forms the “chromophor” needed for the radical formation. Patent pending.
Benefits of photoinitiator-free UV curing
1. Highest output from direct excitation of the acrylate double bond:
- Improvement of chemical and temperature resistance
- Better mechanical properties
- Better light and weathering stabilitiy.
- Crosslinking of fixed systems (UV water-based coatings) and post-crosslinking of polymers with residual double bonds efficient possible
- Crosslinking density higher than with EBH (Electron Beam Hardening)
- no negative influence to the substrate as EB on Paper, PVC, etc
2. No or very low (<0.5%) concentrations of photoinitiators required, resulting in:
- Significant reduction of migration and VOC (Volatile Organic Compounds) emission
- No “UV odor”
- Limit values for migration from food packaging can be adhered to.
- Migration and VOC emission similar to EBH at doses of 30 to 40 kGy.
3. Oxygen sensitivity of UV curing greatly reduced:
- Operation of UV systems up to 1000 ppm residual oxygen possible.
- Nitrogen production through PSA (Pressure Swing Adsorption) as an alternative to vaporization possible.
Food packaging, Furniture, Floor, Automotive
The EU Regulation of 2016 calls for a specific migration limit (SML) of <10μg/kg (10 ppb) for food packaging starting at 1 January 2016. This limit is well below what we have using our method.
An upgrading of existing installations is possible. Contact us – we will find the right solution for your application.
IOT GmbH filed a patent for the process of the photoinitiator-free UV curing.
IOT GmbH Leipzig
Innovative Surface Technologies
UV - Technik
Plasma- und Ionenstrahltechnik