Tetrabutanone oximesilane (TOS) is one of the ketone oxime crosslinker products, and there is an adverse impact on the development of the industry
Tetrabutanone oximesilane, referred to as TOS in English, with the chemical formula C16H32N4O4Si, is colorless or yellow transparent liquid, soluble in ethanol, ether, chloroform and other organic solvents, easy to hydrolyze, hygroscopic or water-related cross-linking reaction will release butanone oxime, which is flammable and will burn and decompose when exposed to open flame and high temperature.
Tetrabutanone oximesilane can be used alone, mainly as a silane cross-linking agent, mild in nature, and can also be used in combination with vinyl tributanone oxime-silane (VOS), which has the advantages of high reactivity, fast film-forming speed and high cross-linking density, and can also be used in combination with methyltributanone oxime-silane (MOS), which has the advantages of short film-forming time, high tensile strength and no surface cracks.
Functional silanes include silane coupling agents and silane crosslinking agents, and silane crosslinking agents include deacidification, ketoxime and dealcoholization, and ketoxime has become the mainstream of the market. Tetrabutanone oximesilane (TOS), methyltributanone oximesilane (MOS) and vinyltributanone oximesilane (VOS) are the three most common types of ketone oxime crosslinker products.
According to the "2024-2029 China Tetrabutanone Oxime Silane (TOS) Industry Market In-depth Research and Development Prospect Forecast Report" released by Xinsijie Industry Research Center, tetrabutanone oximesilane is mainly used as a silane crosslinking agent for the curing of room temperature vulcanized silicone rubber and silicone glass glue; It can also be used to synthesize adhesives to improve the bonding strength of resins, rubber, chemical fibers, metals, ceramics and other materials; It can also be used as a protective base and catalyst in the process of organic synthesis to improve the mechanical properties and thermal stability of polymers or polymer materials.
The industrial production of tetrabutanone oxime silane is mainly based on butanone oxime as raw material, and under the condition of toluene solvent, silicon tetrachloride is added for reaction to obtain crude product, and then liquid ammonia is neutralized and filtered to obtain the finished product. With the progress of technology, the technical route of tetrabutanone oxime production is still increasing, for example, methyl isobutanone oxime is used as raw material, silicon tetrachloride and ammonia are added for reaction in the presence of solvent to obtain crude products, and then the finished product is obtained by distillation process.
The silicon tetrachloride used in the preparation of tetrabutanone oxime silane can be an industrial by-product. The semiconductor and photovoltaic industries in mainland China are huge, with a high annual output of polysilicon, and more than 10 tons of silicon tetrachloride will be produced for every 1 ton of polysilicon produced, and in 2023, the by-product silicon tetrachloride emissions of the mainland polysilicon industry will exceed 14.3 million tons. The by-product silicon tetrachloride resource reuse has environmental and economic benefits, and it is one of the important solutions to produce tetrabutanone oxime-silane.
Industry analysts said that tetrabutanone oxime-silane manufacturers mainly include German Nitrochemie, Zhejiang Quzhou Silicon Treasure Chemical Co., Ltd., Hubei Xianling Chemical Co., Ltd. and other domestic and foreign enterprises. In 2021, butanone oxime was recognized as a class 1B carcinogen by the European Union and was restricted in the EU and some other countries, which will adversely affect the development of the tetrabutanone oxime-silane industry.