▎ 摘　　要

NOVELTY - Manufacture of composite polymer membrane involves dissolving 10-40% polymer in a solvent under constant agitation, adding 0.5-2% graphene additive, mechanically agitating at 300 rpm for 6 hours, scattering of the dispersion obtained by a viscous film on a support, immersing the support in a precipitation medium containing distilled water at 40-70 degrees C, preferably 60 degrees C for 2-15 minutes, preferably 5 minutes, and exchanging between solvent and non-solvent. USE - Manufacture of composite polymer membrane for filtration and nanofiltration (all claimed). ADVANTAGE - The composite membrane has uniform porosity, high hydrophilicity and excellent mechanical strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for composite membrane having porosity of 73.1-75.9%.