Name: Photoinitiator Blend TPO/184 for UV Coatings
Brand: Coatingsink
SKU: photoinitiator-blend-tpo-184
Availability: InStock

Question 1

Why combine TPO with Photoinitiator 184 rather than use either alone?

Accepted Answer

TPO (acylphosphine oxide) absorbs strongly at 380–400 nm and provides deep-layer cure with excellent LED compatibility, while PI 184 (α-hydroxy ketone) absorbs at 300–350 nm for efficient surface cure under mercury arc lamps. The 50:50 blend delivers synergistic through-cure across both mercury and LED lamp spectra, reducing oxygen inhibition at the surface while maintaining cure depth, without requiring the formulator to balance two separate additions.

Question 2

Is this blend suitable for LED UV curing at 365 nm or 395 nm?

Accepted Answer

Yes. The TPO component has significant molar absorptivity at 365 nm and 395 nm, making the blend effective under LED sources at both wavelengths. PI 184 contributes less at these longer wavelengths, but the combined system typically requires a 10–20% higher dose compared to mercury arc systems to achieve equivalent cross-link density, depending on coating thickness and pigment loading.

Question 3

How should this blend be incorporated into a UV wood coating formulation?

Accepted Answer

Dissolve the blend directly in the reactive diluent (e.g., TPGDA, HDDA) with mild warming to 40–50°C and agitation before adding to the oligomer base. Avoid prolonged exposure to ambient light during preparation. For pigmented systems with TiO₂ loadings above 15%, increase dosage toward 4% and consider pairing with a co-initiator such as DETX to counteract inner filter effects.

Appearance	Off-white to pale yellow solid
Active Content	≥98%
Recommended Dosage	2–4% on formulation weight
Blend Ratio (TPO:184)	50:50 by weight
UV Absorption Peak (TPO component)	380–400 nm

Photoinitiator Blend TPO/184 for UV Coatings

Specifications

FAQ

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