Material for formation of seal for battery electrolyte

Abstract

A seal molding material for cell electrolytic solution, which comprises an EPDM composition comprising a peroxide-crosslinkable EPDM and an organic peroxide, the seal molding material being for use at the electrode site of a nickel-hydrogen cell, wherein the EPDM composition comprises preferably 100 parts by weight of a peroxide-crosslinkable EPDM, 10 to 150 parts by weight of a filler and 1 to 8 parts by weight of an organic peroxide, and not more than 40 parts by weight of hydrocarbon-based oil can be further contained. The seal material molded from the seal molding material for cell electrolytic solution has a sufficient durability against a potassium hydroxide-based electrolytic solution and a longer life, and is free from any deterioration, when energized at the electrode site of a nickel-hydrogen cell.

1 . A seal molding material for cell electrolytic solution, which comprises an EPDM composition comprising a peroxide-crosslinkable EPDM and an organic peroxide, the seal molding material being for use at the electrode site of a nickel-hydrogen cell.  
     
     
         2 . A seal molding material for cell electrolytic solution according to  claim 1 , wherein the EPDM has a Mooney viscosity ML 1+4 (100° C.) of 25 to 80.  
     
     
         3 . A seal molding material for cell electrolytic solution according to  claim 1 , wherein the EPDM composition comprises 100 parts by weight of a peroxide-crosslinkable EPDM, 10 to 150 parts by weight of a filler and 1 to 8 parts by weight of an organic peroxide.  
     
     
         4 . A seal molding material for cell electrolytic solution according to  claim 3 , wherein the filler is carbon black.  
     
     
         5 . A seal molding material for cell electrolytic solution according to  claim 3 , wherein not more than 40 parts by weight of hydrocarbon-based oil is further contained.  
     
     
         6 . A seal material for cell electrolytic solution, made by cross-linking molding of a seal molding material for cell electrolytic solution according to  claim 1 , the seal material being used at the electrode site of a nickel-hydrogen cell.  
     
     
         7 . A seal material for cell electrolytic solution according to  claim 6  for use at the electrode site of a nickel-hydrogen cell using a potassium hydroxide-based electrolytic solution.  
     
     
         8 . A seal material for cell electrolytic solution according to  claim 6 , which shows an energized immersion durability, when the seal material is immersed in an electrolytic solution energized by a DC current, and the surface deterioration state of the seal material subjected to the energized immersion for a predetermined time is visually observed.  
     
     
         9 . A seal material for cell electrolytic solution according to  claim 8 , which shows an energized immersion durability against a potassium hydroxide-based electrolytic solution.  
     
     
         10 . A seal material for cell electrolytic solution, made by cross-linking molding of a seal molding material for cell electrolytic solution according to  claim 3 , the seal material being used at the electrode site of a nickel-hydrogen cell.  
     
     
         11 . A seal material for cell electrolytic solution, made by cross-linking molding of a seal molding material for cell electrolytic solution according to  claim 5 , the seal material being used at the electrode site of a nickel-hydrogen cell.  
     
     
         12 . A seal material for cell electrolytic solution according to  claim 10  for use at the electrode site of a nickel-hydrogen cell using a potassium hydroxide-based electrolytic solution.  
     
     
         13 . A seal material for cell electrolytic solution according to  claim 11  for use at the electrode site of a nickel-hydrogen cell using a potassium hydroxide-based electrolytic solution.  
     
     
         14 . A seal material for cell electrolytic solution according to  claim 10 , which shows an energized immersion durability, when the seal material is immersed in an electrolytic solution energized by a DC current, and the surface deterioration state of the seal material subjected to the energized immersion for a predetermined time is visually observed.  
     
     
         15 . A seal material for cell electrolytic solution according to  claim 11 , which shows an energized immersion durability, when the seal material is immersed in an electrolytic solution energized by a DC current, and the surface deterioration state of the seal material subjected to the energized immersion for a predetermined time is visually observed.  
     
     
         16 . A seal material for cell electrolytic solution according to  claim 14 , which shows an energized immersion durability against a potassium hydroxide-based electrolytic solution.  
     
     
         17 . A seal material for cell electrolytic solution according to  claim 15 , which shows an energized immersion durability against a potassium hydroxide-based electrolytic solution.