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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 4. Отображено 4.
10-06-2015 дата публикации

Dinuclear non-metallocene titanium complex as well as synthesis method and application method of complex

Номер: CN104693232A
Автор: CHENG ZHENGZAI, ZHANG WEIXING, GONG KAI, YAN XIAOCHAO, LYU ZAOSHENG, YE LONG, LI WENBING
Принадлежит:

The invention discloses a dinuclear non-metallocene titanium complex as well as a synthesis method and an application method of the complex. The prepared dinuclear non-metallocene titanium complex D has the characteristics of high vinyl polymerization activity (greater than 106gPE/mol Ti.h) within the range of 0-100 DEG C and wide molecular weight distribution (Mw/Mn is greater than 4) of the catalytic polymerization product; the polyethylene within a range from a low molecular weight to an ultrahigh molecular weight can be directly produced by use of a dinuclear catalytic system, and therefore, the high-molecular weight polyethylene can be lubricated by use of a low-molecular weight part while the excellent properties of the high-molecular weight polyethylene are maintained; as a result, the processability of the polyethylene is greatly improved, the difficultly reconciled contradiction between the mechanical properties and the processability of the polyethylene is solved, and two major ...

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Номер записи: 1
16-05-2023 дата публикации

Method for preparing mononitrophenol through selective nitration of phenol

Номер: CN116120186A
Автор: HANG XIANG, LYU ZAOSHENG
Принадлежит:

The invention discloses a method for preparing mononitrophenol, which comprises the following steps: nitrating phenol under mild conditions by using H-ZSM-5 as a catalyst and N2O5 as a nitrating agent, then sequentially carrying out suction filtration, neutralization, extraction and drying, and retaining an organic phase for gas chromatography detection. The method is high in phenol conversion rate and high in mono-substituted phenol nitration selectivity. The adopted catalyst is simple to prepare, high in catalytic activity, easy to separate after reaction and reusable, and has a wide application prospect.

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Номер записи: 2
10-06-2015 дата публикации

Titanium complex containing nitro-substitution group phenoxy-imine ligand, preparation method and application

Номер: CN104693233A
Автор: CHENG ZHENGZAI, ZHANG WEIXING, HUANG ZHIYONG, WANG YUN, TANG RAN, YE LONG, YAN XIAOCHAO, LYU ZAOSHENG
Принадлежит:

The invention discloses a titanium complex containing nitro-substitution group phenoxy-imine ligand, a preparation method and the application. The titanium complex is formed by making the nitro-substitution group phenoxy-imine ligand and titanium tetrachloride be subjected to the coordination reaction as well as the dehydrochlorination reaction in a dichloromethane solution. The nitro-substitution group phenoxy-imine ligand L is formed by 4,6-dinitro-2-aminophenol and salicylaldehyde or 5-nitrosalicylaldehyde through a condensation reaction in a high yield mode. The titanium complex has the advantages that raw materials are cheap and easy to obtain, the preparation cost is low, a few of activating agents are needed when the prepared titanium complex C containing the nitro-substitution group phenoxy-imine ligand catalyzes vinyl for the polymerization reaction, the vinyl polymerization catalytic activity is ultrahigh, the titanium complex is resistant to high polymerization temperature and ...

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Номер записи: 3
04-06-2014 дата публикации

Environment-friendly type modified coal asphalt and preparation method thereof

Номер: CN103834421A
Автор: LI QIXIANG, SUN YU, LYU ZAOSHENG, SU LONG, LIAO ZHIYUAN
Принадлежит:

The invention relates to environment-friendly type modified coal asphalt and a preparation method thereof. The preparation method in the technical scheme comprises the following steps: placing 20-30 weight parts of coal asphalt into a reaction kettle with a reflux unit; then, under the conditions that temperature is 70 DEG C-90 DEG C and stirring speed is 80 r/minute-100r/minute, adding 67-77 weight parts of mixed solvent into the reaction kettle, stirring for 10 minutes, re-adding 2.6-3.2 weight parts of modifier and 0.20-0.32 weight parts of sulfuric acid under the condition that temperature and stirring speed are the same, and stirring for 1 hour-5 hours to obtain a coal asphalt mixture; and finally, under the condition with the temperature of 100 DEG C-110 DEG C, distilling the obtained coal asphalt mixture under reduced pressure to recycle solvent to prepare the environment-friendly type modified coal asphalt. According to the invention, process is simple, reaction temperature is low ...

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Номер записи: 4