- Synthesis process of antioxidant 1098
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The invention provides a synthesis process of an antioxidant 1098 (N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, which comprises the following steps: carrying out ammonolysis reaction on beta-(3,5-di-tert-butyl-4-hydroxyphenyl)methyl propionate, which is synthesized by addition reaction of 2,6-di-tert-butylphenol and methyl acrylate, and 1,6-hexamethylenediamine toobtain the antioxidant 1098. The preparation method is suitable for large-scale production and industrial production of the antioxidant 1098, cost saving is achieved through effective recovery and circulation of the solvent, and the whole reaction process is environmentally friendly through centralized treatment of waste gas and the like.
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Paragraph 0022-0031
(2021/03/31)
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- A method for preparing an antioxidant
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The invention provides a preparation method for an antioxidant. The method includes: subjecting a compound shown as formula (III) and a compound shown s formula (IV) to dehydration reaction in the presence of an organic solvent. The method is characterized in that in the dehydration reaction process, the reaction generated water and part of the organic solvent are separated from the reaction system, and water division treatment is carried out, then the water-containing organic solvent subjected to water division treatment contacts a first dehydrating agent, and the organic solvent obtained after contact is returned to the reaction system. Specifically, n is 1 or 2, x is 1 or 2, y is an integer of 0-6, R1 and R2 are not a straight chain or branched chain alkyl group with a hydrogen atom or carbon atom number of 1-6 at the same time, and R3 and R4 are not a straight chain or branched chain alkyl group with a hydrogen atom or carbon atom number of 1-6 at the same time. By adopting the method provided by the invention to prepare the antioxidant, the dehydration effect of the reaction system can be enhanced, and accordingly the reaction efficiency and product yield can be enhanced. (formula III and formula IV).
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- Synthesis, antioxidant properties, and reaction kinetics of aliphatic diamine bridged hindered phenols
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A series of aliphatic diamine bridged hindered phenols was synthesized. Their antioxidant activity was evaluated for assessing the role of bridging groups in trapping 1,1-diphenyl-2-picrylhydrazyl radical (DPPH?) and in 2,2'-azodi(isobutyronitrile) (AIBN) induced oxidation of styrene. The study of reaction kinetics of scavenging of the peroxyl radicals demonstrated that the scavenging ability of the DPPH free radical decreased when length of the bridging groups increased. However, the ability to protect styrene from AIBN-induced oxidation increased with increased length of the bridging groups.
- Li,Guo,Wang,Shi
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p. 2797 - 2803
(2017/03/22)
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- Piperidyl organosiloxanes and polymer substrates light-stabilized therewith
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Novel piperidyl organosiloxanes, well adapted for the light/UV-stabilization of a wide variety of polymer substrates, e.g., polyolefins and polyalkadienes, have the structural formula (I): STR1
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- Process for the preparation of polyalkyl-1-oxa-diazaspirodecane compounds
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The invention relates to a process for the preparation of polyalkyl-1-oxa-diazaspirodecane compounds, which can be used as highly active light stabilizers for polymers. The reaction is carried out in a solvent mixture of at least one alcohol and if appropriate an inert organic solvent in the presence of solid alkali metal hydroxide or a corresponding amount of a mixture of solid alkali metal hydroxide and water as the sole catalyst. The process offers the advantage that, by using a solvent mixture and dispensing with a phase transfer catalyst, a higher rate of reaction and therefore higher product quality with the same yield are achieved. By dispensing with a phase transfer catalyst, which remains in the waste water and must be disposed of expensively, and by the reusability of the solvent mixture, the process is more environment-friendly and more economical than processes known to date.
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- Methylphosphonic acid amine salt lubricant additives
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Novel salts of methylphosphonic acid with primary amines are described. These compounds are preferably used as extreme pressure additives in lubricant compositions.
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