Aramid yarn having excellent adhesive properties with polyurethane matrix resin, method for producing the same and aramid fabric produced therefrom

Abstract

An aramid yarn which is adhesive to a polyurethane matrix resin is disclosed. The polyurethane resin is adhered and impregnated to the surface and inside of the aramid yarn, and the content of the polyurethane resin is 1.5 to 7.0% by weight based on the sum of the weight of the polyurethane resin adhered and impregnated to the surface and inside of the aramid yarn plus the weight of the aramid yarn before the polyurethane resin is adhered and impregnated. An aramid fabric is woven into a basket-weave structure and thus has low denseness, the wetting property with the polyurethane matrix resin which is impregnated into the aramid fabric is improved, and consequently, the adhesive properties between the aramid fabric and the polyurethane matrix resin are improved.

1 . An aramid yarn having excellent adhesive properties with a polyurethane matrix resin characterized in that the polyurethane resin is adhered and impregnated to the surface and inside of the aramid yarn, and the content of the polyurethane resin is 1.5 to 7.0% by weight based on the sum of the weight of the polyurethane resin adhered and impregnated to the surface and inside of the aramid yarn plus the weight of the aramid yarn before the polyurethane resin is adhered and impregnated. 
     
     
         2 . The aramid yarn having excellent adhesive properties with a polyurethane matrix resin according to  claim 1  characterized in that the aramid yarn is in the form of a multifilament consisting of a plurality of monofilaments. 
     
     
         3 . The aramid yarn having excellent adhesive properties with a polyurethane matrix resin according to  claim 1  characterized in that the polyurethane resin is a reaction product of polytetramethylene ether glycol and isophorone diisocyanate. 
     
     
         4 . A method for producing an aramid yarn having excellent adhesive properties with a polyurethane matrix resin characterized in that, during continuous processes of producing an aramid yarn by spinning, coagulating, washing, drying, and heat-treating an aramid spinning dope containing an aramid resin and a solvent, while adhering and impregnating a sizing agent composition composed of a polyurethane resin, an organic solvent, and water to the surface and inside of the aramid yarn, the content of the polyurethane resin adhered and impregnated to the surface and inside of the aramid yarn is adjusted to 1.5 to 7.0% by weight based on the sum of the weight of the polyurethane resin adhered and impregnated to the surface and inside of the aramid yarn plus the weight of the aramid yarn before the polyurethane resin is adhered and impregnated. 
     
     
         5 . The method for producing an aramid yarn having excellent adhesive properties with a polyurethane matrix resin according to  claim 4 , characterized in that, during the process of spinning the aramid yarn by extruding an aramid spinning dope in the form of monofilaments through spinneret holes and then converging the extruded monofilaments in the form of a multifilament with a converging roller, a sizing agent composition is supplied to the surface of the converging roller to adhere and impregnate the sizing agent composition to the surface and inside of the aramid yarn that is converged in the form of multifilament. 
     
     
         6 . The method for producing an aramid yarn having excellent adhesive properties with a polyurethane matrix resin according to  claim 4 , characterized in that the sizing agent composition is composed of 35 to 45% by weight of a polyurethane resin, 2 to 5% by weight of an organic solvent, and 55 to 63% by weight of water. 
     
     
         7 . The method for producing an aramid yarn having excellent adhesive properties with a polyurethane matrix resin according to  claim 4 , characterized in that the water is deionized water. 
     
     
         8 . The method for producing an aramid yarn having excellent adhesive properties with a polyurethane matrix resin according to  claim 4 , characterized in that the polyurethane resin is a reaction product of polytetramethylene ether glycol and isophorone diisocyanate. 
     
     
         9 . An aramid fabric having excellent adhesive properties with a polyurethane matrix resin characterized in that a warp and a weft are composed of aramid yarn, wherein a polyurethane resin is adhered and impregnated to the surface and inside of the aramid yarn, and the content of the polyurethane resin is 1.5 to 7.0% by weight based on the sum of the weight of the polyurethane resin adhered and impregnated to the surface and inside of the aramid yarn plus the weight of the aramid yarn before the polyurethane resin is adhered and impregnated. 
     
     
         10 . The aramid fabric having excellent adhesive properties with a polyurethane matrix resin according to  claim 9 , characterized in that the warp and the weft are woven into a basket-weave structure. 
     
     
         11 . The aramid fabric having excellent adhesive properties with a polyurethane matrix resin according to  claim 9 , characterized in that the fineness of each of the warp and the weft is 1000 to 3000 denier, and the density of each of the warp and the weft is 10 to 20 epi (end per inch).