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Method for preparing liquid octylated diphenylamine antioxidant

A technology for octylated diphenylamine and diphenylamine, which is applied in the preparation of amino compounds from amines, the preparation of amino compounds by condensation/addition reactions, and organic chemistry, etc. control, become solid and other problems, to achieve the effects of easy deployment, short reaction period, prevention of thermal oxidation and elastic bending aging

Inactive Publication Date: 2012-01-18
JIANGSU FEIYA CHEM IND
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Problems solved by technology

[0008] 2. The reaction process is not easy to control. It is necessary to take samples to analyze the content of dioctyl diphenylamine in the middle. If the judgment is wrong or the sampling is inaccurate, when the final dioctyl diphenylamine content in the finished product is higher than 25%, the product will be broken at room temperature. become solid
Therefore, it is difficult to prepare an alkyl diphenylamine composition with a high content of monoalkyl diphenylamine

Method used

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Embodiment Construction

[0026] Add 200g of diphenylamine (purity 99.8%) and 9.8g of activated clay after drying and dehydration into a 1L reactor equipped with a stirrer, a dripping device and a nitrogen replacement device. After opening the nitrogen replacement 3 times, start heating to 80°C. After the diphenylamine was completely melted, the stirring was turned on and the temperature was raised to 130°C. 160g-196g diisobutene is slowly added dropwise to the above reactor through the feeding device over 1 hour, the reaction mixture is kept for about 3 hours to react, the temperature is controlled at 130-135°C, and the reaction pressure is 0.2-0.25MPa.

[0027] After the incubation period, 23 g of isobutylene was introduced within 1 hour to continue the reaction. After the reaction solution was filtered under normal pressure, the filter residue was used in the next batch. The filtrate was simply distilled to obtain the liquid octylated diphenylamine antioxidant.

[0028] After analysis, the liquid octylat...

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Abstract

The invention discloses a method for preparing a liquid octylated diphenylamine antioxidant, which belongs to the field of chemical synthesis, and particularly relates to a method for synthesizing high-content mono-octyl diphenylamine. The method comprises the following steps of: under the action of a catalyst, making diphenylamine react with diisobutylene to generate an octylated diphenylamine mixture; introducing isobutene for reacting; and distilling to obtain the liquid octylated diphenylamine antioxidant, wherein the catalyst is dehydrated active white clay. The prepared liquid octylated diphenylamine antioxidant is a light-yellow viscous liquid at normal temperature, and the moving viscosity is 50-300 mm<2> / s at the temperature 40 DEG C. The liquid octylated diphenylamine antioxidant can be effectively applied to turbines, aircrafts and various oil products and lubricating agents which are applied at high operation temperatures, and can be applied to high-polymer rubber products to prevent rubber from being thermally oxidized and aged by elastic deflection.

Description

Technical field [0001] The invention belongs to the field of chemical synthesis, and particularly relates to a method for synthesizing high-content monooctyl diphenylamine. Background technique [0002] At present, whether it is aerospace lubricants, engine lubricants, and industrial lubricants (such as high-temperature chain oil, compressor oil, heat transfer oil, etc.), all have put forward requirements for high-performance antioxidants, and this requirement is More and more demanding. The antioxidant zinc dialkyl dithiophosphate (ZDDP) in general engine oil can no longer meet the requirements of environmental protection and high temperature performance, and new high temperature antioxidants need to be developed. [0003] The above requirements can be met by the antioxidant alkylated diphenylamine. Alkylated diphenylamine can be effectively used in turbines, aircrafts, and oils and lubricants for various applications at high operating temperatures. It can also be used in polyme...

Claims

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Application Information

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IPC IPC(8): C07C211/55C07C209/68C07C209/60
Inventor 曹宏生徐志华吴开运王忠冬於海霞
Owner JIANGSU FEIYA CHEM IND
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