Artificial turf system comprising hydrophobic sand

Abstract

The present application relates to an artificial turf system, comprising an elastic substrate layer, an artificial turf carpet applied on the elastic substrate layer, and a first filler material which is filled into the artificial turf carpet, wherein the first filler material comprises a hydrophobic sand, and the use thereof as sports artificial turf.

1 . An artificial turf system, comprising:
 an elastic substrate layer,   an artificial turf carpet applied on the elastic substrate layer, and   a first filler material which is filled into the artificial turf carpet, wherein the first filler material comprises a hydrophobic sand.   
     
     
         2 . The artificial turf system according to  claim 1 , wherein the elastic substrate layer comprises a bonded elastic layer, an elastic carrier layer, or shock pads. 
     
     
         3 . The artificial turf system according to  claim 1 , wherein the artificial turf carpet is selected from an artificial turf carpet comprising at least one textured yarn, an artificial turf carpet comprising at least one flat yarn, or an artificial turf carpet comprising at least one flat yarn and at least one textured yarn. 
     
     
         4 . The artificial turf system according to  claim 1 , wherein the hydrophobic sand has a substantially round-grained shape. 
     
     
         5 . The artificial turf system according to  claim 1 , wherein at least 95% of the hydrophobic sand has a grain size distribution of 0.2 to 2.0 mm. 
     
     
         6 . The artificial turf system according to  claim 1 , wherein the hydrophobic sand has an SiO2 fraction of ≥96% and/or a CaCO 3  fraction of ≥3%. 
     
     
         7 . The artificial turf system according t to  claim 1 , wherein the filling quantity of the hydrophobic sand is 5-20 kg/m 2 . 
     
     
         8 . The artificial turf system according to  claim 1 , wherein the hydrophobic sand is hydrophobized sand. 
     
     
         9 . The artificial turf system according to  claim 8 , wherein the hydrophobized sand is selected from hydrophobized quartz sand, hydrophobized fluvial sand, hydrophobized sea sand, hydrophobized drifting sand, hydrophobized desert sand, and mixtures thereof. 
     
     
         10 . The artificial turf system according to  claim 8 , wherein the hydrophobized sand is silanized sand. 
     
     
         11 . The artificial turf system according to  claim 10 , wherein the silanized sand is selected from sand which is silanized with alkyl trimethoxysilane, alkyl triethoxysilane, alkyl oligosiloxane, alkyl polysiloxane, or mixtures thereof. 
     
     
         12 . The artificial turf system according to  claim 10 , wherein the weight fraction of the silanization comprises ≤5 wt. %, preferably 0.001-3 wt. %, more preferably 0.001-1 wt. %, based on the total weight of the silanized sand. 
     
     
         13 . The artificial turf system according to  claim 1 , further comprising a second filler material which is filled into the artificial turf carpet. 
     
     
         14 . The artificial turf system according to  claim 13 , wherein the second filler material is selected from cork, olive stone waste, nut shells, wood, rubber granules or mixtures thereof. 
     
     
         15 . The artificial turf system according to  claim 1 , wherein the artificial turn system is used as sports artificial turf. 
     
     
         16 . An artificial turf system having an elastic substrate and an artificial turf carpet on top of the elastic substrate, the artificial turf carpet filled with a layer of hydrophobized sand having a residual moisture of less than 20% by weight (20 wt. %) after water falls uniformly over a surface of the artificial turf system and is drained off after a period of time. 
     
     
         17 . The artificial turf system of  claim 16 , wherein the layer of hydrophobized sand has a height of approximately 17 mm. 
     
     
         18 . The artificial turf system of  claim 16 , wherein the period of time is 20 minutes. 
     
     
         19 . The artificial turf system of  claim 16 , wherein the hydrophobized sand provides the artificial turf system with a rotational resistance of 30 Nm or more. 
     
     
         20 . The artificial turf system of  claim 16 , wherein the hydrophobized sand provides the artificial turf system with a rotational resistance of 30 Nm or more at −5° C. ambient temperature.