The Research On Increased Anti-fibrillation Of Lyocell Fibers By Cross-Linking Treatment

Lyocell fiber is called the new green fiber of the21st century, it have a highdegree of crystallinit, a high degree of orientation, low energy consumption, non-polluting and can be natural degradation. It has a superior performance and widerange of applications. However, the horizontal integration power of among the micro-fiber is weaker, as so in the state of wetting can easy to fibrillation, which largelylimits its range of applications. In order to overcome the deficiency, required toprocessing the lyocell fiber for enhancing anti-fibrillation property. The best way is touse the crosslinking treatment for the lyocell fiber.The paper studied crosslinking reaction of several crosslinking agent of superiorperformance for lyocell fibers, and explored the influence regularity of crosslinkingagent to anti-fibrillation of lyocell fibers. Directly to use the1,3,5-acrylamide-hexahydro-1,3,5-triazine(TAHT) as crosslinking agent, To synthesis the crosslinkingagent2,4-dichloro-6-hydroxy-1,3,5-triazine sodium salt(DCHT-Na), and to selectpolybasic acid(PMA) and citric acid(CA) as mixed crosslinking agent for thecrosslinking reaction of lyocell fibers, Respectively to enhancing anti-fibrillationproperty of lyocell fibers, Research on the influence regularity of different reactionconditions to the cross-linking results, and determined the optimum processes andmethods, explored the the mechanism of the cross-linking reaction.1,3,5-Acrylamide-hexahydro-1,3,5-triazine(TAHT) is used to cross-linkingtreatment for enhancing anti-fibrillation property of lyocell fibers by Courtauldscompany. The anti-fibrillation property was indicated by wet friction method, and theinfluence of TAHT cross-linking treatment conditions on anti-fibrillation property andmechanical property of lyocell fibers were system studied. Respectively investigatedthe influence regularity by crosslinking treatment liquid, TAHT concentration, cross-linking temperature, soaking time, steaming time and TSP concentration. The resultsshowed that anti-fibrillation property of lyocell fibers increased more a hundred timesand tenacity decreased only18%at the optimum processes. FT-IR results indicatedthe lyocell fibers took place michael addition reaction and generated secondary bondwith TAHT, To be formed a network crosslinked structure and case to the anti-fibrillation property of the lyocell fiber have a significantly improved. 2,4-Dichloro-6-hydroxy-1,3,5-triazine sodium salt(DCHT-Na) is used to cross-linking treatment for enhancing anti-fibrillation property of lyocell fibers by Lenzingcompany, But the cross-linking agent is easy to hydrolysis and case a lower marketretention. The paper explored the synthetic methods of the DCHT-Na and determinedthe optimum synthesis is the sodium hydroxide ice bath method by comparing thevarious aspects of conditions. DCHT-Na is used to cross-linking treatment forenhancing anti-fibrillation property of lyocell fibers. Respectively investigated theinfluence regularity by steaming time, DCHT-Na concentration, NaOH concentration,Na2SO4concentration and dipping time. The results showed that anti-fibrillationproperty of lyocell fibers increased71.7times and tenacity decreased only20.0%atthe optimum processes. FT-IR results indicated the lyocell fibers took placenucleophilic substitution reaction and generated secondary bond with DCHT-Na, Tobe formed a network crosslinked structure and case to the anti-fibrillation property ofthe lyocell fiber have a significantly improved.Polycarboxylic acid often used as anti-wrinkle finishing agent of cotton and othernatural fiber fabrics, In the paper, PMA-CA as a mixed crosslinking agent is used tocross-linking treatment for enhancing anti-fibrillation property of lyocell fibersinnovatively. Respectively investigated the influence regularity by drying time, curingtemperature, curing time, catalyst concentration and proportion of CA and PMA, andmechanical property of lyocell fibers were system studied. Obtained the experimentalconditions of cross-linking treatment of PMA-CA and Lyocell fiber. The resultsshowed that anti-fibrillation property of lyocell fibers increased by16.8times andtenacity decreased only10.3%at the optimum processes. FT-IR results indicated thelyocell fibers took place esterification reaction, To be formed a network crosslinkedstructure and case to the anti-fibrillation property of the lyocell fiber have asignificantly improved.There are respective advantages in three cross-linking agent by modifiedmultiple, mechanical properties, materials and process. Base to the modification effectand cost, may be choose the cross-linking agents and cross-linking process to improvethe anti-fibrillation property of lyocell fibers independently. The paper provideddetailed basic research for the anti-fibrillation property of lyocell fibers, and provided a strong reference value for the industrialization of cross-linking process for home andabroad.