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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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Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Применить Всего найдено 2. Отображено 2.
11-08-2023 дата публикации

Prefabricated pavement slab connecting device

Номер: CN116575285A
Автор: CHEN DECHENG, FAN ZHIGUO, YAN RUIZHENG, LIN KAI, LIU RUINING, LI GUANGYAO, YANG HONGQING, SUN KAIWEN, FAN XIANGKONG, XUE RENWU
Принадлежит:

The invention belongs to the technical field of prefabricated pavement slabs, and particularly relates to a prefabricated pavement slab connecting device which comprises a prefabricated pavement slab. First sliding grooves are formed in the side walls of the periphery of the prefabricated pavement slab. A second sliding groove is formed in the side wall of the first sliding groove. Positioning plates are slidably connected into the pair of corresponding first sliding grooves at the same time. By forming a plurality of sets of first sliding grooves in the top of the prefabricated pavement slab, a worker can conveniently and rapidly install the positioning plate, the positioning plate is inserted into the first sliding grooves formed in the surfaces of the prefabricated pavement slab to limit the distance between the positioning plate and the first sliding grooves, and the positioning plate is kept stable in cooperation with the extrusion effect of the extrusion plate on the positioning plate ...

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Номер записи: 1
30-06-2023 дата публикации

Modified melamine adhesive and preparation method thereof

Номер: CN116355563A
Автор: GUO HONGFANG, LIU RUINING
Принадлежит:

The invention relates to the technical field of melamine adhesives, and discloses a modified melamine adhesive and a preparation method thereof. The modified melamine adhesive is prepared from the following components in parts by mass: 400 to 750 parts of formaldehyde aqueous solution with the mass fraction of 37 percent, 200 to 310 parts of urea, 55 to 90 parts of melamine, 0.6 to 1.0 part of polyvinyl alcohol, 4 to 6 parts of porous inorganic filler, 60 to 100 parts of pH (Potential of Hydrogen) regulator, 5 to 18 parts of formic acid and 0.1 to 0.3 part of release agent. The melamine adhesive is modified by adding the porous inorganic filler, the polyvinyl alcohol, the release agent and the formic acid on the basis of the melamine adhesive, and the prepared modified melamine adhesive is high in water resistance, resistant to aging, good in demolding effect and environmentally friendly. And a high-quality plywood product which is high in bonding strength, good in dipping and stripping ...

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Номер записи: 2