Method for preparing polytetrafluoroethylene hollow fiber membrane having high bonding strength
A method for preparing a polytetrafluoroethylene hollow fiber membrane having high bonding strength is disclosed in order to solve a disadvantage that polytetrafluoroethylene hollow fiber membranes are high in pore size and cannot meet requirements on high-precision separation or filtration, and a d...
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Main Authors | , , , |
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Format | Patent |
Language | Chinese English |
Published |
29.03.2019
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Subjects | |
Online Access | Get full text |
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Summary: | A method for preparing a polytetrafluoroethylene hollow fiber membrane having high bonding strength is disclosed in order to solve a disadvantage that polytetrafluoroethylene hollow fiber membranes are high in pore size and cannot meet requirements on high-precision separation or filtration, and a disadvantage that wrapped polytetrafluoroethylene hollow fiber membranes are instable in pore size, insufficient in bonding strength and liable to shed. The method includes (1) a slitting step, namely a step of slitting a biaxially oriented polytetrafluoroethylene completely-sintered flat membrane having an average pore diameter range of 0.05-0.5 [mu]m into a polytetrafluoroethylene banded membrane; (2) a soaking step, namely a step of soaking the polytetrafluoroethylene banded membrane in low-molecular-weight polytetrafluoroethylene organic dispersion; (3) a wrapping and shaping step, namely a step of wrapping the soaked polytetrafluoroethylene banded membrane around the external wall of a stretched polytetrafluoro |
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Bibliography: | Application Number: CN201811307789 |