Abrasion resistant composite

Abstract

In various embodiments, the present inventions provide a rubber composite having an abrasion resistance better than about 125 mm 3 under DIN 53516 and comprising a natural rubber, between about 15 to about 25 parts per hundred rubber (PHR) of a butadiene, between about 20 to about 40 PHR of a silica; and between about 0.4 to about 4 PHR of an organosilane polysulfur cross-linking agent. Also provided in various embodiments are multiply rubber materials having a first ply of the above composite and a second thinner ply of a styrene-butadiene rubber.

1 . A rubber composite, comprising: 
 a natural rubber;    between about 15 to about 25 parts per hundred rubber (PHR) butadiene;    between about 20 to about 40 PHR silica; and    between about 0.4 to about 4 PHR organosilane polysulfur cross-linking agent.    
   
   
       2 . The rubber composite of  claim 1 , wherein a material made therefrom has a resistance to abrasion of less than about 125 mm 3  when measured according to DIN 53516.  
   
   
       3 . The rubber composite of  claim 2 , wherein a material made therefrom has a tear strength using Die C of greater than about 265 pounds per linear inch (pli) when measured according to ASTM D624.  
   
   
       4 . The rubber composite of  claim 2 , wherein a material made therefrom has a tensile strength of greater than about 3100 pounds per square inch (psi) when measured according to ASTM D412.  
   
   
       5 . The rubber composite of  claim 2 , wherein a material made therefrom has a hardness of greater than about 35 on the Durometer Scale A when measured according to ASTM D2240.  
   
   
       6 . The rubber composite of  claim 1 , wherein a material made therefrom has a resistance to abrasion of less than about 110 mm 3  when measured according to DIN 53516.  
   
   
       7 . The rubber composite of  claim 6 , wherein a material made therefrom has a tear strength using Die C of greater than about 265 pounds per linear inch (pli) when measured according to ASTM D624.  
   
   
       8 . The rubber composite of  claim 6 , wherein a material made therefrom has a tensile strength of greater than about 3100 pounds per square inch (psi) when measured according to ASTM D412.  
   
   
       9 . The rubber composite of  claim 6 , wherein a material made therefrom has a hardness of greater than about 35 on the Durometer Scale A when measured according to ASTM D2240.  
   
   
       10 . The rubber composite of  claim 1 , wherein the composite comprises between about 15 to about 25 PHR of a plasticizer.  
   
   
       11 . The rubber composite of  claim 10 , wherein the plasticizer comprises HTDS light rubber processing oil.  
   
   
       12 . The rubber composite of  claim 1 , wherein the butadiene comprises a high cis form of 1,4 polyisopropene.  
   
   
       13 . The rubber composite of  claim 1 , wherein the silica has a BET surface area in the range between about 125 to about 150 m 2 /g.  
   
   
       14 . The rubber composite of  claim 1 , wherein the organosilane polysulfur cross-linking agent comprises bis(triethyoxysilylpropyl)polysulfide.  
   
   
       15 . A multiply rubber material, comprising: 
 a first ply, the first ply comprising 
 a natural rubber;  
 between about 15 to about 25 parts per hundred rubber (PHR) butadiene;  
 between about 20 to about 40 PHR silica; and  
 between about 0.4 to about 4 PHR organosilane polysulfur cross-linking agent; and  
   a second ply, the second ply comprising a styrene-butadiene rubber.    
   
   
       16 . The rubber material of  claim 15 , wherein the ratio of the thickness of the first ply to the second ply is in the range between about 3:1 to about 15:1.  
   
   
       17 . The rubber material of  claim 15 , wherein the first ply has a resistance to abrasion of less than about 110 mm 3  when measured according to DIN 53516.  
   
   
       18 . The rubber material of  claim 17 , wherein the rubber material has a tear strength using Die C of greater than about 265 pounds per linear inch (pli) when measured according to ASTM D624.  
   
   
       19 . The rubber material of  claim 17 , wherein the rubber material has a tensile strength of greater than about 3100 pounds per square inch (psi) when measured according to ASTM D412.  
   
   
       20 . The rubber material of  claim 17 , wherein the first ply has a hardness of greater than about 35 on the Durometer Scale A when measured according to ASTM D2240.  
   
   
       21 . The rubber material of  claim 15 , wherein the first ply comprises between about 15 to about 25 PHR of a plasticizer.  
   
   
       22 . The rubber material of  claim 15 , wherein the butadiene of the first ply comprises a high cis form of 1,4 polyisopropene.  
   
   
       23 . The rubber material of  claim 15 , wherein the organosilane polysulfur cross-linking agent of the first ply comprises bis(triethyoxysilylpropyl)polysulfide.  
   
   
       24 . A composite, comprising: 
 between about 50 and about 60 weight percent natural rubber;    between about 20 and about 40 weight percent butadiene;    between about 10 and about 40 weight percent silica; and    between about 0.2 and about 2 weight percent of an organosilane polysulfur crosslinking agent.    
   
   
       25 . The composite of  claim 1 , wherein the composite has a resistance to abrasion according to DIN 53516 of less than about 125 mm 3 .