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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 5. Отображено 5.
02-05-2023 дата публикации

Method for producing polytetrafluoroethylene

Номер: CN116041605A
Автор: KATO TAKETO, FUJIMOTO YOHEI, ICHIKAWA KENJI, SATO HIROYUKI, NANBA YOSHINORI, YOSHIDA HIROTOSHI, ITO KENGO, OKUI CHIAKI, SUKEGAWA MASAMICHI, YAMANAKA TAKU
Принадлежит:

Provided is a method for producing polytetrafluoroethylene, which comprises a polymerization step for obtaining polytetrafluoroethylene by polymerizing tetrafluoroethylene and a modifying monomer in an aqueous medium in the presence of a hydrocarbon-based surfactant, and which is characterized in that the amount of the hydrocarbon-based surfactant at the start of polymerization is more than 50 ppm with respect to the aqueous medium. The polytetrafluoroethylene contains 99.0 mass% or more of a polymerization unit based on tetrafluoroethylene and 1.0 mass% or less of a polymerization unit based on a modified monomer.

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Номер записи: 1
18-07-2023 дата публикации

Method for producing polytetrafluoroethylene and polytetrafluoroethylene-containing composition

Номер: CN116457376A
Автор: NANBA YOSHINORI, KATO TAKETO, ICHIKAWA KENJI, YAMANAKA TAKU
Принадлежит:

Provided is a method for producing polytetrafluoroethylene by polymerizing tetrafluoroethylene in an aqueous medium in the presence of a polymer (1) that is a polymer of a monomer (1) represented by general formula (1): CF2 = CF (-O-Rf-A) and has a weight average molecular weight of 1.0 * 104 or more, the content of the polymerization units (1) based on the monomer (1) is 40 mol% or more with respect to the total polymerization units constituting the polymer (1), and the content of the dimer and the trimer of the monomer (1) is 1.0 mass% or less with respect to the polymer (1).

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Номер записи: 2
22-08-2023 дата публикации

Method for producing fluorine-containing polymer

Номер: CN116622018A
Автор: NANBA YOSHINORI, ICHIKAWA KENJI, FUJIMOTO YOHEI, YOSHIDA HIROTOSHI, SATO HIROYUKI, KATO TAKETO, ITO KENGO, ISHIHARA SUMI, HIGASHI MASAHIRO, YONEDA SATORU, AOYAMA HIROKAZU, SUKEGAWA MASAMICHI, KISHIKAWA YOSUKE, TAIRA TAKAHIRO, OKUI, CHIAKI, YAMANAKA TAKU
Принадлежит:

The purpose of the present invention is to provide a novel method for producing a fluorine-containing polymer. The present invention pertains to a method for producing a fluorine-containing polymer, the method comprising a step for obtaining a fluorine-containing polymer by polymerizing a fluorine-containing monomer in an aqueous medium in the presence of a polymer (1) containing a polymerization unit (1) based on a monomer represented by general formula (1). CX2 = CY (-CZ2-O-Rf-A) (1).

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Номер записи: 3
29-08-2023 дата публикации

METHOD FOR PRODUCING FLUOROPOLYMER COMPOSITION

Номер: CN116670181A
Автор: YAMAZAKI RANA, KATO TAKETO, YAMANAKA TAKU, YOSHIDA HIROTOSHI, YAMABE TAKUYA, OGURA AKIHO
Принадлежит:

Provided is a method for producing a fluorine-containing polymer composition containing a fluorine-containing polymer, in which an aqueous dispersion containing a fluorine-containing polymer is prepared by polymerizing a fluorine-containing monomer in a reactor in the presence of a fluorine-containing surfactant, a polymerization initiator, and an aqueous medium, and supplying an inert gas into the reactor, and heat-treating the aqueous dispersion in the reactor, thereby obtaining the fluorine-containing polymer composition.

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Номер записи: 4
11-04-2023 дата публикации

Modified polytetrafluoroethylene aqueous dispersion liquid

Номер: CN115956091A
Автор: YAMABE TAKUYA, YAMAMOTO EMI, SODA YOSHIHIRO, YAMANAKA TAKU, USAMI RYOTA, KATO TAKETO, SHIROMARU TOMOHIRO, NAKATANI YASUKAZU
Принадлежит:

Provided is a modified polytetrafluoroethylene aqueous dispersion having low viscosity at high temperatures. Provided is an aqueous modified polytetrafluoroethylene dispersion which is characterized by containing a modified polytetrafluoroethylene and a nonionic surfactant, the solid content concentration of the modified polytetrafluoroethylene being 50-70% by mass, substantially not containing a fluorine-containing surfactant, and having a viscosity at 55 DEG C of 80 mPa * s or less. The modified polytetrafluoroethylene contains 0.050% by mass or more and 1.00% by mass or less of polymerized units based on the modified monomer.

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Номер записи: 5