Due to the use of geotextile as the base material for composite geomembranes, in addition to the effects of separation, drainage, reinforcement, and protection of geotextiles, it also has the function of closure (anti-seepage). It can be widely applied in many fields such as water conservancy dikes, road construction, airports, drainage, housing, and environmental protection, mainly playing roles in seepage prevention, protection, and reinforcement in engineering.
We know that carbon black is a material that can almost completely absorb visible light and reflect ultraviolet rays. If it is mixed into the composite geomembrane, it can exhibit good ultraviolet absorption properties by transferring energy at the level of its polycyclic aromatic hydrocarbon structure. A large number of experiments have shown that the light shielding effect of carbon black is related to factors such as its particle size, dispersibility, and dosage. Generally, it is advisable to add carbon black with a particle size of 25 microns and a mass fraction of 2% to 5% in the composite geomembrane. When the amount of carbon black is very low, it cannot exert its ultraviolet shielding function; only when the mass fraction of carbon black reaches the above values does the composite geomembrane possess anti-aging effects. When the mass fraction of carbon black is increased to 2%, the anti-aging ability of the geomembrane can increase by 20 to 30 times. However, if the mass fraction exceeds 5%, it may have a negative impact on the physical properties of the geomembrane. The type of carbon black used as a light stabilizer is best when using channel black, especially the effect of easy-mixing channel black is particularly excellent.
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