Chemical name: (2,4, 6-trimethylbenzoyl) diphenylphosphine oxide
Product Name: TPO
CAS No. : 75980-60-8
Molecular formula: C22H21O2P
Molecular weight: 348.4
Structure formula:
Characteristics
1. Fast curing
2. Resistant to yellowing
3. Low odor
Description
TPO is a highly efficient pyrolytic radical photoinitiator with a wide absorption wavelength range, covering both surface drying and deep curing. Its absorption peak is at 380nm, and it still has absorption at 430nm in the visible light region. It belongs to the acylphosphine oxide pyrolytic radical photoinitiator, and its photolysis products are trimethylbenzoyl radicals and diphenylphosphonyl radicals. They are all highly reactive free radicals.
Product indicators
| Melting point | [℃] | 90-95 |
| Light transmittance | 450nm | ≥90.0 |
| 500nm | ≥95.0 | |
| Clarity | —— | Clear liquid, free of mechanical impurities |
| Ash content | [%] | ≤0.1 |
| Acid value | mgKOH/g | ≤0.2 |
| Content | （HPLC） % | ≥99.0 |
Typical characteristics
| Appearance | Pale yellow crystal powder |
| Shelf life (Store in a dry and dark place at a temperature of 0-30℃) | Twelve months from the date of delivery |
Application
It is suitable for initiating ultraviolet polymerization reactions in unsaturated prepolymerization systems, featuring rapid curing, resistance to yellowing, and low odor. It is particularly suitable for the photocuring of colored systems. The absorption wavelength of its photolysis products can shift towards short waves, providing a photobleaching effect, which is conducive to the transmission of ultraviolet light and the curing of thick coatings. Uv-curable coatings and acrylate inks, as well as substrates such as paper, wood, metal, plastic and glass.
Uv-curable coating
2. Printing ink
3. Optical fiber coating
4. CD coating
5. Paper varnish coatings, etc
6. Suggested addition amount: 1-7%
