| 摘要 |
PURPOSE:To enhance the safety of the titled diaphragm for electrolysis and to reduce the consumption of energy by supporting hydrophilic porous layers of a fluorine-contg. polymer on both sides of an ion exchange layer having a specified ion exchange capacity and by specifying the thickness of each of the layers. CONSTITUTION:Porous layers of a fluorine-contg. polymer having gas releasing layers on the surfaces and hydrophilic property in the pores are monolithically supported on both sides of an ion exchange layer of a dry resin having 0.5-2.0mm equiv./g ion exchange capacity to obtain a multilayered diaphragm. The diameter of the pores in the porous layer is 0.01-30mum and the Garley number is 1-1,000. The thickness of the ion exchange layer is 1-150mum, the total thickness of the porous layers is 30-450mum and the thickness of the resulting diaphragm is 31-600mum. The dry resin of the ion exchange layer may be one or more kinds of fluorine-contg. polymers each having sulfonic acid or carboxylic acid groups. Since the diaphragm has strengthened surfaces, the ion exchange layer can be made thin.
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