Study And Application On Environmental Flame Retardant Finishing Of Silk

Flammable textile is one of the fatal causes of fire, as a result, reducing theflammability of textile products should be taken more and more attention. For itsunique performance and advantages，silk is widely used in upscale clothing andinterior decoration materials. The investigation report of fire accident indicated thatcausing the fire first are coming form the textiles and interior decorations. As aconsequecse, the flame retardancy finishing research of the silk fabric has arousedpeople’s widespread concern.at present, textile flame retardant finishing is not able toensure low free formaldehyde. Therefore, exploring the flame retardancy finishingtechnology of excellent flame retardant, low low free formaldehyde and suffieientlaundering durability of silk has high realistic significance and theoretical Value.In this study, organic phosphorus flame retardant HFPO, crosslinking agent2D,catalytic agent C and softening agent T were applied to treat silk fabric throughpad-thermofix anti-crease finishing. The orthogonal and single factor methods wereused to study flame retardant, crosslinking agent, catalytic agent and softening agent,curing time, curing temperature and pH to the influence of the flame retardantproperties and he content of free formaldehyde of silk, so that silk gain betterflame-retardart property and lower free formaldehyde. The ethylene glycol was usedto etherify2D to reduce the free formaldehyde, and the silk of excellent flameretardant properties and Very low free formaldehyde was gaind by etherification2D.According to the research results, examining the influence of flame retardantHFPO and cross-linking2D resin agent to the properties of flame retardant on silkfabrics and the content of free formaldehyde, it determines the best flame retardantfinishing of silk fabrics with technology. The best fire-retardant technology of realsilk: flame retardant agent HFPO310g/L, cross-linking agent2D110g/L, the catalystC45g/L, softening agents T22g/L,3min baking time, temperature of155°c,finishing-liquid pH value of2.7. After the flame retardant finishing, the carbon lengthof silk by Vertical method is5.7cm, the limiting oxygen index is37%, which reachedB1level of Textile combustion performance. while the containing formaldehyde isless than75ppm, reached B level of National general safety technical code for textile products, and it has50wash resistance,Flame retardant finishing has less influence onwhiteness, strength, feeling and K/S ofsilk fabrics. The mogravinetric analysis andScanning electronic microscopic photos of silk burning residue were applied toexplore the pyrolysis of silk fabrics and the flame resistance mechanism, The resultsof the study showed that mechanism of coacervatephase and synergistic effect exist inthe HFPO/2D system.Use glycol to modify2D ethylene resin, and investigate etherification productsunder different conditions on flame retardant effect and formaldehyde influence ofsilk fabrics, to determine the optimal conditions for etherification: etherification oftemperatures is about70°c, and tome is3.5h, the molar ratio of2D resin and glycolis1:1. Hydroxymethyl in the best conditions for etherification of2D resin content is91.72%, and free formaldehyde content is0.97%. on the basis of original conditionsof flame retardant finishing, etherification2D combined with flame retardant finishsilk fabric, determine the best amount of etherification2D is115g/L. After the flameretardant finishing, the carbon length of silk by Vertical method is6.7cm, the limitingoxygen index is34.9%, which also reached B1level of Textile combustionperformance. while the containing formaldehyde is less than20ppm, reached B levelof National general safety technical code for textile products, and it has50washresistance, Flame retardant finishing has less influence on whiteness, strength, feelingand K/S ofsilk fabrics. The results of the study showed that mechanism ofcoacervatephase and P-N synergistic effect are also exist in this system.