UV/thermal-radical curing "For ( Meth ) acrylate systems"
It is possible to improve the reactivity and sensitivity of radical polymerization systems using unsaturated compounds such as ( meth ) acrylic resin.
Resonac's thiols feature a secondary SH group, which stabilizes the mixture compared to conventional thiols and is suitable for one-component compositions due to the extended shelf life.
Improved sensitivity
Reduction of oxygen inhibition
Polymerization of acrylates is easily affected by oxygen, and generated peroxide radicals stops the polymerization.
Thiols donate hydrogen to peroxide radicals, it becomes thiyl radicals themselves and acthelate the polymerization.
In other words, the problem of oxygen inhibition of acrylic photopolymerization can be solved by adding thiols.
IR-Imaging
Curing condition: Exposure 1/cm2
- Under the air atmosphere ( PE1 0wt%, 5wt%, 10wt% )
- Under the Nitrogen atmosphere ( PE1 0wt% )
Measurement : Microscopic ATR imagery method(Ge)
range of measurement: 70 μmx70 μm
It measured the wave length of 1408 cm-1 which the double bond has it and expressed the intensity in color.
スクロールできますamount of PE1 / composition | 0wt% ( N2 ) PE1 / U-15HA / TMPTA / Irg184 = 0/47.5/47.5/5 |
0wt% ( Air ) PE1 / U-15HA / TMPTA / Irg184 = 0/47.5/47.5/5 |
5wt% ( Air ) PE1 / U-15HA / TMPTA / Irg184 = 5/45/45/5 |
10wt% ( Air ) PE1 / U-15HA / TMPTA / Irg184 = 10/42.5/42.5/5 |
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Sticky | 〇 | × | 〇 | 〇 |
IR-imaging |
low high
Deep curability
Effect of chain transfer ability
Monomer: BisA type acrylate 100phr
Thiol: KarenzMT PE1 2phr
Photo initiator: Irgacure184 2phr
Improved stability
Improved stability for acrylic system
The mercapto group and the double bond cause an addition reaction, but the secondary thiol suppresses the contact between the mercapto group and the double bond due to steric hindrance.
Therefore, the composition using the secondary thiol has improved stability as compared with it using the primary thiol.
※Dipentaerythritol hexaacrylate
Reduction of curing shrinkage
Evaluation
Fill the mold with the composition.
Light source: High pressure mercury lamp
Illuminance: 150mW/cm2、1J/cm2.
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Composition
Trimethylolpropane triacrylate: 100phr
Irgacure184: 2phr -
Composition
Trimethylolpropane triacrylate:90phr
KarenzMT PE1: 10phr
Irgacure184: 2phr
Improved adhesion (Stress relaxation)
- Glass
- Stainless
- PET
※ The information contained herein is based upon data considered true and accurate. However, Resonac Corporation accepts no responsibility or risk which may result from the handling and use of products or for infringement of any patent.