▎ 摘　　要

NOVELTY - Preparing high-strength anti-aging, anti-clogging and reinforced composite geotextile involves: (A1) mixing polypropylene, glass fiber and modified calcium sulfate whiskers, introducing into screw extruder, melting and extruding, cooling, then carrying out airflow drafting, paving filaments on a net curtain, needle punching through a pre-pressing roller, and subjecting the formed filament fiber net to pre-needling and main needling reinforcement to prepare a high-strength polypropylene nonwoven fabric; (A2) ultrasonically cleaning the nonwoven fabric with deionized water, placing in an oven, baking, washing with deionized water, and naturally drying to prepare a high-strength anti-aging nonwoven fabric; (A3) weaving polyester fiber by a textile machine to obtain a woven gray cloth; and (A4) arranging the anti-aging nonwoven fabric on lower and upper layers, arranging woven blank in middle layer, and laminating by hot pressing at 80-200 kgf and 100-220 degrees C for 1-5 minutes. USE - The method is useful for preparing high-strength, anti-aging, anti-clogging and reinforced composite geotextile. ADVANTAGE - The method: adopts modified polyvinylidene fluoride emulsion coated on nonwoven fabric to form microporous membrane, which effectively intercepts fine sand and gravel waste particles to prevent leakage, and increases filtration flux of composite geotextile to prevent clogging; uses graphene oxide, which improves hydrophilicity of emulsion, improves filtration flux, and reduces the membrane resistance of the emulsion due to large number of oxygen-containing groups. The pollution substance is not easy to deposit on the surface and the membrane pores, which improves anti-fouling performance and stable permeability of the membrane, and reduces the occurrence of clogging. The composite geotextile has excellent anti-aging function due to use of UV shielding agent nano-titanium dioxide. DETAILED DESCRIPTION - Preparing high-strength anti-aging, anti-clogging and reinforced composite geotextile involves: (A1) evenly mixing polypropylene, glass fiber and modified calcium sulfate whiskers, introducing into screw extruder, melting, extruding, transferring to a spinning box, spraying by a spinneret hole of the spinning box, cooling by using side fan, then carrying out airflow drafting by using a tubular-type drafter to achieve uniform filament splitting, evenly paving filaments on a net curtain under the control of side blowing airflow, needle punching through a pre-pressing roller, and subjecting the formed filament fiber net to pre-needling and main needling reinforcement to prepare a high-strength polypropylene nonwoven fabric; (A2) ultrasonically cleaning the nonwoven fabric with deionized water for 10-20 minutes, using dipping-rolling method to clean nonwoven fabric with titanium dioxide/graphene oxide/polyvinylidene fluoride composite emulsion, placing in an oven, baking at 80-100 degrees C for 30-40 minutes, washing 2-3 times with deionized water, and naturally drying to prepare a high-strength anti-aging nonwoven fabric; (A3) weaving polyester fiber by a textile machine to obtain a woven gray cloth; and (A4) arranging the anti-aging nonwoven fabric on lower and upper layers, arranging woven blank in middle layer, and laminating by hot pressing at 80-200 kgf and 100-220 degrees C for 1-5 minutes.