| 摘要 |
Membrane (1) comprises a bulkhead layer (2), which is composed of more than 50 wt.% of PVC, and a barrier layer (3), where the barrier layer, on the one hand, is a barrier layer S1 having a polyvinyl alcohol layer (4) comprising more than 50 wt.% of copolymer polyamide (PA), which is connected to the bulkhead layer by a polyurethane layer (5). The polyurethane layer is composed of more than 10 wt.% of polyurethane (PUR), where the barrier layer, on the other hand, is a barrier layer S2 having a composition comprising 5-50 wt.% of PUR and 50-95 wt.% of copolymer PA. Membrane (1) comprises a bulkhead layer (2), which is composed of more than 50 wt.% of PVC, and a barrier layer (3), where the barrier layer, on the one hand, is a barrier layer S1 having a polyvinyl alcohol layer (4) comprising more than 50 wt.% of copolymer PA, which is connected to the bulkhead layer by a polyurethane layer (5). The polyurethane layer is composed of more than 10 wt.% of polyurethane (PUR), where the barrier layer, on the other hand, is a barrier layer S2 having a composition comprising 5-50 wt.% of PUR and 50-95 wt.% of copolymer PA. The PUR has at least one nucleophilic functional group consisting of hydroxyl group, carboxyl group, sulfonate group and phosphate group, where the co-polymer PA is an ethylene-vinyl alcohol copolymer. An independent claim is included for producing the membrane, comprising either (i) applying a polyurethane dispersion (PD) composition layer on the bulkhead layer, (ii) flashing off the PD to form the polyurethane layer, and (iii) forming a polyvinyl alcohol-layer on the polyurethane layer, or (ia) applying a composition Z1 comprising the PUR, co-polymer PA and solvent on the bulkhead layer, and (iia) flashing off the composition Z1 to form the barrier layer. |
