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1、北京服裝學(xué)院2008屆頸j.研究生學(xué)位論文Lyocell纖維紡絲原液的制備研究摘要Lyocell纖維是通過將天然纖維索漿粕溶解在N.甲基嗎啉.N.氧化物(簡稱NMM0)的水溶液中,形成紡絲原液,用干噴濕紡法制得的一種再生纖維素纖維。本文對(duì)Lyocell纖維紡絲原液的制備工藝進(jìn)行了較系統(tǒng)的研究。通過對(duì)纖維素的溶脹過程的對(duì)比研究,得到了最佳溶脹工藝條件。x一射線衍射結(jié)果表明,纖維素用乙二胺處理后結(jié)晶度下降了33.7%,在NMMO/H20中溶解的時(shí)間縮短了25%。經(jīng)對(duì)比實(shí)驗(yàn)研究得到本實(shí)驗(yàn)條件下的最佳工藝是:投料時(shí)漿粕含水量40/0--6%,
2、NMMO濃度740/0--85%,溶脹溫度為68-80℃,溶解溫度95~105℃,攪拌速率44~50rpm,真空度控制在0.095MPa--0.098MPa之間,纖維素濃度在9%~11%之間,在此條件下能制得均一、零切粘度2100Pa.S(90℃)左右、非牛頓指數(shù)0.6-0.7、結(jié)構(gòu)粘度指數(shù)14~19的粘度適中、可紡性好的紡絲溶液,此溶液能穩(wěn)定紡絲,制得的纖維纖度1.83dtex,強(qiáng)度4.13cN/dtex,斷裂伸長率11.8%。關(guān)鍵詞:LyocellN一甲基嗎啉一N-氧化物乙二胺溶脹溶解北京服磐學(xué)院2068屆碩士研究生學(xué)位論文STU
3、DYoNTHESPINNINGSoLUTIoNoFLYoCELLFIBERABSTRACTLyocellistheregeneratedcellulosicfiberwhichisproducedbydryjet-wetspinningfromceilulose/NMMO/H20solution.NMMOistheshort—nameofN··methylmorpholine·-N··oxideInthisthesisthepreparationprocessofspinningsolutionsincellulose/NMMO/H2
4、0wereinvestigated.TheprocessconsistsoftWOsteps:oneistheswellingandtheotheristherealdissolving.Ithasbeenfoundthattheswellingprocessvarieswithdifferentconditions,suchasconcentration,temperatureandtheoptimumswellingprocesswasgained.Thechangeofcrystallinityofthecellulosepul
5、pwascharacterizedbyX-raydiffraction.Itcanbeconcludedthatthecrystallinityofcellulosedecreased33.7%bypretreatedinsolutionof1,2。ethylenediamine.ThedissolvingtimeofcelluloseinNMMO/H20systemwasdecreased25%.Theoptimumprocesswasgained:watercontentofpulpis4%~6%.concentrationofN
6、MMOis74%85%,temperatureofswellingis68—80。C,thedissolvingtemperatureis95-105"C,thestirringrateis44~50rpm,thevacuum.’.北京服裝學(xué)院2008屆碩士研究生學(xué)位論文degreecontrolledbetweenO.095MPaandO.098MPa.thecelluloseconcentrationis9%~11%.IntIlisconditiontheuniforillsolutioncanbemadewhichthezero
7、.shearratioviscosityisabout2100Pa.s(90℃),thenon—Newtonindexisabout0.6-4).7.a(chǎn)ndthestructureviscosityindexisabout14--19Thesolutionpreparedinoptimumconditionwasusedtospin,andthefiberpropertyhasbeenmeasured.Thetenacityis4.13cN/dtex.theelongationis11.8%KEYWORDS:Lyocell:N-met
8、hylmorpholie—N—oxide;1,2一ethylenediamine;swelling;dissolving原創(chuàng)性聲明本人鄭重聲明:所呈交的學(xué)i立論文,{本人在導(dǎo)師的指導(dǎo)下,獨(dú)立進(jìn)行研究工作所取得的成果。除文