Aramid cord treatment

Abstract

The subject invention relates to a composition and method for treating an aramid cord including a bisphenol-A-based- and/or a bisphenol-F-based-liquid epoxy resin, a reactive diluent, and a curing agent. The composition and method also may include an elastomer-modified epoxy-functional adduct and/or an elastomer-modified epoxy-resin adduct.

1 . A rubber product which is comprised of an elastomeric material having a flexible aramid fiber cord embedded therein, wherein the flexible aramid fiber cord is made by a method consisting of the sequential steps of: (1) heating the flexible aramid fiber cord, (2) dipping the aramid fiber cord into a liquid composition which consists of: (i) a liquid epoxy resin selected from the group consisting of a bisphenol-A-based liquid epoxy resin, a bisphenol-F-based liquid epoxy resin and combinations thereof; (ii) 2-ethylhexyl glycidyl ether; and (iii) at least one curing agent, (3) removing any excess liquid composition from the flexible treated cord, and (4) drying the flexible treated aramid fiber cord, wherein the treated aramid fiber cord is flexible enough to be used as a reinforcement in rubber-based products including power transmission belts, hoses, and conveyor belts. 
     
     
         2 . The rubber product as specified in  claim 1  wherein the rubber product is a power transmission belt. 
     
     
         3 . The rubber product as specified in  claim 1  wherein the rubber product is a hose. 
     
     
         4 . The rubber product as specified in  claim 1  wherein the rubber product is a conveyor belt. 
     
     
         5 . The rubber product as specified in  claim 1  wherein the rubber product is a tire. 
     
     
         6 . The rubber product as specified in  claim 1  wherein the rubber product is a rubber container. 
     
     
         7 . The rubber product as specified in  claim 1  wherein the rubber product is a power transmission belt component. 
     
     
         8 . The rubber product as specified in  claim 1  wherein the rubber product is a hose component. 
     
     
         9 . The rubber product as specified in  claim 1  wherein the rubber product is a conveyor belt component. 
     
     
         10 . The rubber product as specified in  claim 1  wherein the rubber product is a tire component. 
     
     
         11 . The rubber product as specified in  claim 1  wherein the treated aramid fiber cord is dried in step (4) at a temperature which is within the range of about 100° C. to about 150° C. for a period of about 10 minutes to about 30 minutes. 
     
     
         12 . The rubber product as specified in  claim 1  wherein excess liquid composition is wiped off of the treated cord in step (3). 
     
     
         13 . The rubber product as specified in  claim 1  wherein the liquid epoxy resin is a bisphenol-F-based liquid epoxy resin. 
     
     
         14 . The rubber product as specified in  claim 1  wherein the curing agent is a polyamide. 
     
     
         15 . The rubber product as specified in  claim 1  wherein the curing agent is present in an amount of from about 0.6 to about 1.5 times the stoichiometric quantity, as determined using the amine-H-equivalent-weight/epoxide equivalent weight method. 
     
     
         16 . The rubber product as specified in  claim 1  wherein the excess liquid composition is removed from the flexible treated cord is step (3) by passing the flexible treated cord through an orifice. 
     
     
         17 . The rubber product as specified in  claim 1  wherein the flexible aramid fiber cord is heated in step (1) to a temperature which is within the range of about 110° C. to about 120° C. for a period of about 12 hours to about 24 hours. 
     
     
         18 . The method as specified in  claim 16  wherein the flexible treated aramid fiber cord is dried in step (4) at a temperature which is within the range of about 100° C. to about 150° C. for a period of about 10 minutes to about 30 minutes. 
     
     
         19 . The rubber product as specified in  claim 18  wherein the flexible aramid fiber cord is heated in step (1) to a temperature which is within the range of about 110° C. to about 120° C. for a period of about 12 hours to about 24 hours.