The aging of composite geomembranes is inseparable from their material properties and is also an inherent characteristic of polymer materials. It cannot be completely eliminated, but effective measures can be taken to delay its aging. Specifically, we can start from two aspects:
1. Anti aging agents can be added to the raw materials of composite geomembranes to suppress the effects of external factors such as light, oxygen, and heat on the materials, such as adding an appropriate amount of antioxidants, light stabilizers, and dark carbon black. Some units also add anti-aging agents to polypropylene, and after four years of direct exposure to sunlight, the strength loss is only 25%. However, if the anti-aging agent is not added and the polypropylene is directly exposed to sunlight for 2 to 3 months, the strength loss will be almost complete.
2. Protective measures can be taken in engineering, such as minimizing the exposure time of materials to sunlight, using rock and soil (required to be over 30cm thick), or covering with deep water.
Composite geomembranes buried in soil and water can avoid direct ultraviolet radiation. When producing polyethylene films, carbon black can be added to shield against ultraviolet radiation, which can block the direct radiation of ultraviolet radiation and extend its service life. For the same type of geomembrane, the thicker it is, the more resistant it is to aging.
Composite geomembrane, due to its excellent performance, can not only be used for drainage, but also for the construction of waterproof facilities, bringing special convenience to people's lives. Therefore, delaying aging can improve its value in use.