RU2007140316A - Способ получения микропористых полиолефиновых мембран и микропористых мембран - Google Patents

Способ получения микропористых полиолефиновых мембран и микропористых мембран Download PDF

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RU2007140316A
RU2007140316A RU2007140316/04A RU2007140316A RU2007140316A RU 2007140316 A RU2007140316 A RU 2007140316A RU 2007140316/04 A RU2007140316/04 A RU 2007140316/04A RU 2007140316 A RU2007140316 A RU 2007140316A RU 2007140316 A RU2007140316 A RU 2007140316A
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membrane
stretching
polyolefin
dispersion
solvent
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RU2007140316/04A
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RU2418821C2 (ru
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Котаро ТАКИТА (JP)
Котаро ТАКИТА
Котаро КИМИСИМА (JP)
Котаро КИМИСИМА
Коити КОНО (JP)
Коити КОНО
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Тонен Кемикал Корпорейшн (Jp)
Тонен Кемикал Корпорейшн
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/20—Manufacture of shaped structures of ion-exchange resins
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    • B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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    • B01D67/0002—Organic membrane manufacture
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    • B01D67/0025—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching
    • B01D67/0027—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching by stretching
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Abstract

1. Способ получения микропористых полиолефиновых мембран, содержащий стадии: (1) перемешивания в расплаве полиолефина и мембранообразующего растворителя, (2) экструдирования полученного расплава через матричное отверстие, (3) охлаждения экструдата с образованием гелевой формы, (4) первого, по меньшей мере, одноосного растяжения гелевой формы, (5) удаления упомянутого мембранообразующего растворителя и (6) второго, по меньшей мере, одноосного растяжения мембраны с удаленным растворителем, где температура первого растяжения варьируется от температуры кристаллизации дисперсии упомянутого полиолефина +15°С до температуры кристаллизации дисперсии +40°С, и где увеличение при втором растяжении составляет 1,1-2,5 раз. ! 2. Способ по п.1, отличающийся тем, что первоначально растянутая мембрана контактирует с горячим растворителем до и/или после удаления мембранообразующего растворителя. ! 3. Способ получения микропористых мембран по п.1, отличающийся тем, что температура при втором растяжении варьируется от температуры кристаллизации дисперсии полиолефина до температуры кристаллизации дисперсии +40°С. ! 4. Способ по п.1, отличающийся тем, что термофиксацию мембраны проводят после второго растяжения. ! 5. Способ по п.1, отличающийся тем, что полиолефиновая мембрана имеет воздухопроницаемость 30-400 с/100 см3/20 мкм, пористость 25-80%, средний диаметр пор 0,01-1,0 мкм и соотношение изменения толщины 15% или более после сжатия при нагревании при 2,2 МПа при 90°С в течение 5 мин, воздухопроницаемость постнагревательного сжатия составляет 600 с/100 см3/20 мкм или менее. ! 6. Способ получения микропористых полиолефиновых мембран, содержащий стадии (1) перемеши

Claims (9)

1. Способ получения микропористых полиолефиновых мембран, содержащий стадии: (1) перемешивания в расплаве полиолефина и мембранообразующего растворителя, (2) экструдирования полученного расплава через матричное отверстие, (3) охлаждения экструдата с образованием гелевой формы, (4) первого, по меньшей мере, одноосного растяжения гелевой формы, (5) удаления упомянутого мембранообразующего растворителя и (6) второго, по меньшей мере, одноосного растяжения мембраны с удаленным растворителем, где температура первого растяжения варьируется от температуры кристаллизации дисперсии упомянутого полиолефина +15°С до температуры кристаллизации дисперсии +40°С, и где увеличение при втором растяжении составляет 1,1-2,5 раз.
2. Способ по п.1, отличающийся тем, что первоначально растянутая мембрана контактирует с горячим растворителем до и/или после удаления мембранообразующего растворителя.
3. Способ получения микропористых мембран по п.1, отличающийся тем, что температура при втором растяжении варьируется от температуры кристаллизации дисперсии полиолефина до температуры кристаллизации дисперсии +40°С.
4. Способ по п.1, отличающийся тем, что термофиксацию мембраны проводят после второго растяжения.
5. Способ по п.1, отличающийся тем, что полиолефиновая мембрана имеет воздухопроницаемость 30-400 с/100 см3/20 мкм, пористость 25-80%, средний диаметр пор 0,01-1,0 мкм и соотношение изменения толщины 15% или более после сжатия при нагревании при 2,2 МПа при 90°С в течение 5 мин, воздухопроницаемость постнагревательного сжатия составляет 600 с/100 см3/20 мкм или менее.
6. Способ получения микропористых полиолефиновых мембран, содержащий стадии (1) перемешивания в расплаве полиолефина и мембранообразующего растворителя, (2) экструдирования полученного расплава через матричное отверстие, (3) охлаждения экструдата с образованием гелевой формы, (4) первого, по меньшей мере, одноосного растяжения гелевой формы, (5) удаления упомянутого мембранообразующего растворителя, (6) второго, по меньшей мере, одноосного растяжения мембраны с удаленным растворителем, где первоначально растянутую мембрану обрабатывают горячим растворителем до и/или после удаления мембранообразующего растворителя, а увеличение при втором растяжении составляет 1,1-2,5 раз.
7. Способ получения микропористых мембран по п.6, отличающийся тем, что температура при втором растяжении варьируется от температуры кристаллизации дисперсии полиолефина до температуры кристаллизации дисперсии +40°С.
8. Способ по п.6, отличающийся тем, что термофиксацию мембраны проводят после второго растяжения.
9. Способ по п.6, отличающийся тем, что полиолефиновая мембрана имеет воздухопроницаемость 30-400 с/100 см3/20 мкм, пористость 25-80%, средний диаметр пор 0,01-1,0 мкм и соотношение изменения толщины 15% или более после сжатия при нагревании при 2,2 МПа при 90°С в течение 5 мин, воздухопроницаемость постнагревательного сжатия составляет 600 с/100 см3/20 мкм или менее.
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