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Method for producing photo initiator FMT

A technology of photoinitiator and production method, which is applied in chemical instruments and methods, organic chemistry, metallocene, etc., can solve the problems of insufficient yield, complex production process, and large discharge of waste water and liquid, and achieve easy purification, Good thermal stability and simplified production process

Inactive Publication Date: 2010-05-26
荆门市昱奎化工有限责任公司
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Problems solved by technology

The disadvantage of this method is: the production process is relatively complicated, the yield is not high enough (75-80%), and the discharge of waste water and liquid is relatively large

Method used

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Embodiment Construction

[0008] On the basis of the existing photoinitiator FMT production method, the purification process of crude 2,4-difluorophenylpyrrole can be omitted. The process steps are: react 750 kg of 2,5-dimethoxytetrahydrofuran with 2,4-difluoroaniline 650 in a low-temperature (°C) reactor for 3.5 hours to generate 2,4-difluorophenylpyrrole, and then Directly add 450 kilograms of titanocene dichloride and 1500 kilograms of solvent in the low temperature (℃) reactor, and add 800 kilograms of organic strong base (sodium diisopropylamide, lithium diisopropylamide, sodium diethylamide or diethylamide lithium) under the catalysis of dechlorination in 4 hours to obtain the photoinitiator FMT. Appearance of this product: orange to yellow powder, melting point: 168-172°C, content ≥99%, absorption peak at 390, 460nm. This photoinitiator FMT is now on the market in our company. It is widely used in UV coatings, UV inks, UV adhesives, and photopolymerization printing plates. It can be used alone ...

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Abstract

The invention relates to a method for producing a photo initiator FMT which is prepared by the following process steps of: reacting 2,5-dimethoxy tetrahydrofuran with 2,4-difluoroaniline in a low-temperature reaction kettle to generate 2,4- difluorophenylpyrrole; and directly adding titanocene dichloride and solvent in the low-temperature reaction kettle to dechlorinate under the catalysis of organic strong alkali. The method adopts a 'one-pot method' (i.e. the reaction is finished in one reaction kettle); since the process for purifying crude 2,4-difluorophenylpyrrole is saved, the method has easy reaction, high yield, stable product quality and easy purification. The invention simplifies the production process, saves the equipment investment, reduces the production cost, improves the yield of products (up to 85-90 percent), greatly reduces the discharge amount of wastewater and waste liquid, and is beneficial to environmental protection.

Description

technical field [0001] The invention relates to the field of production methods of chemical products. In particular, it relates to the production method of photoinitiator FMT. Background technique [0002] Photoinitiator is one of the indispensable components in UV curing materials, and it plays a decisive role in the sensitivity of the photocuring system. Photoinitiator FMT (chemical name double 2,6-difluoro-3-pyrrole phenyl titanocene, molecular formula: C30H22F4N2Ti, molecular weight 534) is a relatively high-end photoinitiator product, and currently only Ciba in Switzerland is the only one in the world Manufactured by Refining Chemicals. Its production method is to react 2,5-dimethoxytetrahydrofuran with 2,4-difluoroaniline in a low-temperature reactor to generate 2,4-difluorophenylpyrrole crude product, and 2,4-difluorobenzene The crude pyrrole is purified to become a high-quality product, and then the 2,4-difluorophenylpyrrole fine product is added into a low-temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F17/00
Inventor 何长云
Owner 荆门市昱奎化工有限责任公司
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