Thioxanthone photoinitiator containing cyclic acetal and preparation method thereof

Abstract

The invention discloses a thioxanthone photoinitiator containing cyclic acetal shown as below and a preparation method thereof. The 1,3-benzodioxolane or 1,3-benzodioxane and derivative thereof and 2-thiosalicylic acid are used as raw materials and concentrated sulphuric acid is used as solvent to react at 0-70 DEG C for 1-24 hours and prepare the thioxanthone containing cyclic acetal. As cyclic acetal group is introduced in thioxanthone and cyclic acetal can be used as the co-initiator of thioxanthone, the compound of the invention can be directly used as photoinitiator to replace the thioxanthone/amine initiation system and reduce the yellowing and toxicity caused by amine co-initiator and have wide application prospect in the photocuring industrial field.

Description

Technical field The invention belongs to a photoinitiator and a preparation method thereof, in particular to a thioxanthone photoinitiator containing a ring acetal and a preparation method thereof. Background technique The photopolymerization reaction of multifunctional monomers such as bis(meth)acrylate can quickly form a highly cross-linked polymer network structure. This feature is useful for curing speed, mechanical strength and stability of cured film in industrial coatings, dental restoration materials, etc. Areas with high sexual requirements are particularly important. Photoinitiator is a key component of the light curing system. It is related to whether the oligomer and diluent of the formula system can quickly change from liquid to solid when light is irradiated. Its basic function characteristics are: the initiator molecule has a certain light absorption ability in the ultraviolet light region (250-400nm) or visible light region (400-800nm). After directly or indire...

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Problems solved by technology

However, amine compounds are toxic and carcinogenic, and the cured film cause...

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