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US 11,692,085 B2Granted
Geomembranes and methods for making and using the same
AssigneeUniversity of South Florida
InventorsYasin Kocak, Manoj K. Ram, Venkat Bhethanabotla
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Abstract
Described herein are geomembranes with improved chemical, physical, and mechanical properties. In one aspect, the geomembrane includes polyethylene, a phenolic antioxidant, a phosphite antioxidant, a hindered amine light stabilizer, and carbon black. Also described herein are methods for making the geomembranes described herein.
Claims20
A geomembrane comprising:
- polyethylene,
- from 3000 ppm to 4000 ppm of a phenolic antioxidant,
- from 500 ppm to 1000 ppm of a phosphite antioxidant,
- from 4000 ppm to 6000 ppm of a hindered amine light stabilizer, and
- from 1.5 wt % to 3.5 wt % of carbon black, the polyethylene, the phenolic antioxidant, the hindered amine light stabilizer, and the carbon black amount to 100 wt % of the geomembrane;
- and
- the geomembrane has
- (i) a thickness from 0.5 mm to 1.0 mm;
- and
- (ii) a carbonyl index from 0.217 to 0.382 after 180 days forced air aging at 85° C.
7 more elements
A geomembrane comprising:
- polyethylene;
- a phenolic antioxidant that is 3,3′,3′,5,5′,5′-hexa-tert-butyl-a,a′,a′-(mesitylene-2,4,6-triyl)tri-p-cresol;
- a phosphite antioxidant that is (2,4-di-tert-butylphenyl)phosphite;
- a hindered amine light stabilizer that is poly[[6-[(1,1,3,3-tetramethylbutyl)amino]-1,3,5-triazine-2,4-diyl][(2,2,6,6-tetramethyl-4-piperidinyl)imino]-1,6-hexanediyl[(2,2,6,6-tetramethyl-4-piperidinyl)imino]];
- and
- carbon black having a density of 1.139 gm/cm3.
3 more elements
Dependencies are inferred from the claim text.