46 NYLON 46 COPOLYMER FILAMENTARY YARN FOR REINFORCING RUBBER METHOD FOR PREPARING THE SAME AND DIPPED CORD PRODUCED FROM THE SAME

摘要

PURPOSE: Nylon 4,6 copolymer filamentary yarn for reinforcing rubber, method for preparing the same, and dipped cord produced from the same are provided, thereby improving properties of nylon 4,6 copolymer filamentary yarn, related to reinforcing rubber cord or V-belt reinforcing cord. CONSTITUTION: Nylon 4,6 copolymer filamentary yarn for reinforcing rubber is prepared from nylon 4,6 copolymer resin comprising 90 wt.% of -£NH-(CH2)4-NH-CO-(CH2)4-CO|- and 10 wt.% of comonomer, preferably caprolactam, and having density of 160 to 250 ml/g, wherein the filamentary yarn has properties of intensity of 6.7 cN/dtex, ultimate elongation of at least 15%, dry heat contraction ratio of 4.0% or less at 180 deg. C, and density of at least 1.1600g/cm2. A method for preparing the nylon 4,6 copolymer filamentary yarn comprises the steps of: melt spinning the nylon 4,6 copolymer resin comprising 90 wt.% of -£NH-(CH2)4-NH-CO-(CH2)4-CO|- and 10 wt.% of comonomer, preferably caprolactam, and having density of 160 to 250 ml/g to prepare melt spined yarn having viscosity of at least 160ml/g; cooling the melt spined yarn to prepare an undrawn yarn; and drawing the undrawn yarn with 3.0 to 5.5 times of drawing ratio.