Production process of 560 dtex/72 f trilobal flame retardant nylon 66 FDY
A nylon 66 chip with a relative viscosity of 2.28 used as raw material was blended with a flame retardant masterbatch with 50％melamine cyanurate(MCA),a nitrogen based flame retardant,by mass fraction to produce 560 dtex/72 f trilobal flame retardant nylon 66 fully drawn yarn(FDY)by melt spinning on a chip spinning production line.The main production process conditions were explored.The results showed that the spinning process was stable with a top-quality rate of 91％and full-package rate of 82％and the produced fiber had good mechanical properties and flame retardance,including breaking strength of 4.4 cN/dtex,elongation at break of 40.7％,dry hot shrinkage of 6.1％,yarn irregularity of 1.2％and limiting oxygen index of 27.5％when the spinning process conditions were optimized as followed:5％MCA flame retardant masterbatch by mass fraction,18-hole spinneret with trilobal spinneret holes in diamond arrangement,melt pipeline temperature of 270℃,spinning box tem-perature of 281℃,cross air blow speed of 0.5-0.6 m/s,third hot roller temperature of 190℃and winding speed of 2600-2800 m/min.
nylon 66 fiberfully drawn yamprofiled fiberflame retardantproduction process
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