Preparation method of photoinitiator TPO

Abstract

The invention provides a preparation method of a photoinitiator TPO, comprises the following formula: 22.5% of diethyl aniline, 7.5% of absolute methanol, 34% of chlorodiphenylphosphine, and 36% of 2,4,6-trimethyl benzoyl chloride. The method comprises the following steps: 1, stirring and uniformly mixing diethyl aniline and absolute methanol; 2, warming to 20 DEG.C, slowly dropping chlorodiphenylphosphine, preserving heat for 2 hours; 3, pumping out the material, and filtering for later use; 4, uniformly mixing the 2,4,6-trimethyl benzoyl chloride; 5, warming to 80 DEG.C, slowly dropping the material for later use in the step 3, and then preserving for 1 hour; 6, carrying out suction filtering by using a suction filtering groove to obtain the photoinitiator TPO. The process is simple, the flammable and combustible solvent such as methylbenzene is unnecessary to use in the reaction process, the preparation method is safe, reliable and in favor of energy-saving and environment-protecting.

Description

technical field [0001] The invention relates to a production method of a chemical product, in particular to a preparation method of a photoinitiator TPO. Background technique [0002] 2,4,6-Trimethylbenzoyl diphenylphosphorus oxide, the photoinitiator TPO, is a highly efficient free radical-type photoinitiator with absorption in the long wavelength range. Due to its wide absorption range, its effective absorption peak can reach about 420nm, and its absorption peak is longer than that of conventional initiators. After being illuminated, two free radicals, benzoyl and phosphoryl, can be generated, and both can initiate polymerization, so the photocuring speed is fast, and at the same time With photobleaching effect, suitable for deep curing of thick film and non-yellowing properties of coating, low volatility, suitable for water-based, mostly used in white system, especially suitable for UV-curable coating printing ink, UV-curable adhesive, Optical fiber coatings, photoresist...

AI Technical Summary

Problems solved by technology

[0003] At present, the production process of 2,4,6-trimethylbenzoyl diphenylphosphine oxide uses the method of acylation of primary phosphine and acid chloride in the presence of alkali to obtain phosphine and then oxidation. This traditional process exists The following problems: First, toluene needs to be used in the reaction process, and the temperature is too high. The production process is not conducive to environmental protection and is dangerous; It is easy to generate static electricity during operation, and there are potential safety hazards. The third is that hydrogen peroxide must be used for oxidation. It is very difficult to treat the acidic wastewater generated in the production process. For this reason, the existing technology is very unfavorable. The development of the situation has caused the production of this product to be greatly affected. limits