product name:

Irgacure 2959

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Quick Details


UV photoinitiator 2959;



Molecular structure:






White crystalline powder





Melting point









Loss on drying




The results conforms with enterprise standards



Irgacure 2959, chemical name 2-Hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, CAS No.: 106797-53-9, molecular formula C12H16O4, molecular weight 224.25300, PSA66.76000, LogP 1.01130, density 1.183g /cm3, melting point 88-90 ° C (lit.), boiling point 405 ° C at 760 mmH, flash point 155.8 ° C, refractive index .544, vapor pressure 2.75E-07mmHg at 25 °CC.

Irgacure 2959 is an FDA-certified system that allows the use of photoinitiators, low odor, low volatility, low yellowing, and can be used in adhesives that are not in direct contact with foods, with active hydroxyethoxy end hydroxyl groups that can participate in the reaction. It can be used in aqueous photocuring systems with high melting point and can also be used in UV curable powder coatings. In the process of initiation, UV coating, ink and adhesive sensitizer are mainly used, which is better than (photoinitiator ITX, photoinitiator EDAB) and photoinitiator BDK, is not sensitive to oxygen inhibition, and has low volatility. The surface curing effect is excellent, but its spectral absorption band is mainly in the short wavelength band, and the deep curing effect for the UV pigment system is not very good, and it is suitable for use with the photoinitiator 369.


Irgacure 2959 is a highly efficient, non-yellowing UV photoinitiator used to initiate UV polymerization of unsaturated prepolymerization systems, especially for low odor, waterborne acrylate and unsaturated polyester resins. The active hydroxyl group in Irgacure 2959 molecule makes it easy to react with unsaturated resins. It is used in UV-curable formulations for wood, metal, plastic and paper surfaces and is suitable for aqueous UV formulations due to its hydroxyl functionality in the molecule which enhances its solubility in aqueous coating formulations. Irgacure 2959 has lower volatility and odor than Irgacure 1173. Importantly, the active hydroxyl groups of Irgacure 2959 are easily grafted onto the polymer molecules, making them easier to process. Due to its unique properties, Irgacure 2959 is especially recommended for use in UV formulations that require evaporation of moisture through high temperatures and air streams prior to curing.

Application example

Photoinitiator 2959 can be used to prepare UV curable coatings and inks. Examples of photoinitiator 2959 applications are as follows:


A UV-curable connection printing UV coating characterized by being made of the following raw materials by weight: bisphenol A epoxy acrylate 40-45, tripropylene glycol diacrylate 10-12, propylene carbonate 2 -3, UV absorber UV-531 1-2, photoinitiator 2959 2-3, photoinitiator 184 3-4, polyethylene glycol 400 3-5, ethanol 10-12, methylhydrodichlorosilane 2 -3, polytetrahydrofuran ether glycol 1-2, dispersing aid 2-3;


The preparation method comprises the steps of mixing other components than the ultraviolet absorber UV-531, the photoinitiator 2959, and the photoinitiator 184, raising the temperature to 50-60 ℃, and stirring at 500-600 rpm for 15-20 minutes. After cooling to 40 ℃ or less, add UV absorber UV-531, photoinitiator 2959, photoinitiator 184, and continue to stir for 10-15 minutes.


A UV-curable ink with a small particle size and strong adhesion, prepared from the following raw materials by weight: organic pigment 1-3, urethane acrylate 24-26, 1,6 hexanediol diacrylate 12-15, Nano aluminum oxide 2-4, activated carbon 1-2, oleic acid 4-5, tripropylene glycol diacrylate 10-12, phenyl glycidyl ether 1-2, ultraviolet absorber UV-531 1-2, Photoinitiator 2959 4-7, cobalt naphthenate 1-2, sodium silicate 2-3, orange oil 2-3, auxiliary 4-5;


The UV-curable ink with small particle size and strong adhesion is prepared by the following specific steps: firstly adding organic pigment, urethane acrylate, 1,6-hexanediol diacrylate, nano-aluminum trioxide, activated carbon, oleic acid, two The tripropylene glycol diacrylate, the phenyl glycidyl ether, the ultraviolet absorber UV-531 are stirred and mixed, heated to 80-90 ℃, stirred for 25-35 minutes; then the remaining components other than the photoinitiator 2959 are added, The reaction was stirred for 3-5 hours; finally, the temperature was lowered to 60-70 ℃, the photoinitiator 2959 was added, the reaction was stirred for 40-50 minutes, and after cooling, it was ground to obtain a slurry of 20-40 μm.


A method for preparing a vegetable oil-based photoinitiator 2959, comprising the steps of:


1) Preparation of modified vegetable oil: using dehydrated ethyl acetate as solvent, adding 20% ​​60% vegetable oil relative to the mass of solvent, adding 5% 25% modifier relative to solvent mass, 60 80 °C reaction 5 10 hours, obtaining a vegetable oil solution containing a hydroxyl group;


2) Synthesis of silicon-containing photoinitiator: molar ratio of isocyanate-containing silane coupling agent and 2 hydroxy 4 (2 hydroxyethoxy) 2 methyl phenyl ketone in the dark 2:1 4:1 in deionized ethyl acetate, using dibutyltin dilaurate DBTDL as a catalyst, the amount of catalyst added to the mass fraction of the reactants 0.05% 0.3%, 60 80 ° C reaction 4 After 8 hours, a silicon-containing photoinitiator was obtained.


3) mixing the hydroxyl group-containing vegetable oil solution prepared in the step (1) and the silicon-containing photoinitiator prepared in the step (2) at a molar ratio of 5:1 to 1:3, and reacting at 40 60 ° C for 12 24 hours to obtain a vegetable oil base. Photoinitiator 2959 solution;


4) Purification of vegetable oil-based photoinitiator 2959: The plant oil-based photoinitiator 2959 solution obtained in the step (3) is subjected to solution purification by vacuum distillation under light-shielding conditions, and after the treatment, the product is obtained.




Store in a dry, well-ventilated place away from direct sunlight.


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