Txij li thaum lub advent ntawm reactive dyes nyob rau hauv lub xyoo pua xeem, sodium alginate (SA) yog lub ntsiab ntawm reactive dye printing ntawm paj rwb fabrics.
muab tshuaj txhuam. Txawm li cas los xij, nrog kev txhim kho tas mus li ntawm tib neeg cov kev xav tau rau cov nyhuv luam ntawv, sodium alginate ua cov ntawv luam tawm tsis muaj zog rau cov kua qaub thiab alkali.
Thiab cov txheej txheem viscosity yog me me, yog li nws daim ntawv thov nyob rau hauv lub voj voog (cav) npo luam ntawv yog txwv rau qee yam;
Tus nqi ntawm sodium alginate kuj nce ntxiv, yog li cov neeg tau pib tshawb fawb txog nws cov kev xaiv, cellulose ether yog ib qho tseem ceeb.
zoo. Tab sis tam sim no lub ntsiab raw khoom siv rau kev npaj ntawm cellulose ether yog paj rwb, nws cov zis yog poob, thiab tus nqi kuj nce.
Ntxiv mus, feem ntau siv cov tshuaj etherifying xws li chloroacetic acid (muaj tshuaj lom heev) thiab ethylene oxide (carcinogenic) kuj muaj kev phom sij rau tib neeg lub cev thiab ib puag ncig.
Raws li qhov no, hauv daim ntawv no, cellulose ether tau muab rho tawm los ntawm cov nroj tsuag pov tseg, thiab sodium chloroacetate thiab 2-chloroethanol tau siv los ua etherifying agents los npaj carboxylate.
Peb hom fibers: methyl cellulose (CMC), hydroxyethyl cellulose (HEC) thiab hydroxyethyl carboxymethyl cellulose (HECMC)
pebcellulose ethersthiab SA tau siv rau paj rwb ntaub reactive dye printing, thiab lawv cov teebmeem luam ntawv tau muab piv thiab kawm.
txiv hmab txiv ntoo. Cov ntsiab lus tseem ceeb ntawm kev tshawb fawb ntawm thesis tau muab faib ua peb ntu:
(1) Extract cellulose los ntawm cov nroj tsuag pov tseg. Los ntawm kev kho mob ntawm tsib tsob nroj pov tseg (muab straw, nplej husk, nplej straw, ntoo thuv sawdust
thiab bagasse) rau kev txiav txim thiab tsom xam ntawm cov khoom (moisture, tshauv, lignin, cellulose thiab hemicellulose), xaiv
Peb cov khoom siv cog ntoo (pine sawdust, nplej straw thiab bagasse) yog siv los rho cellulose, thiab cellulose yog muab rho tawm
Cov txheej txheem tau optimized; Nyob rau hauv cov txheej txheem optimized, cov theem ntawm ntoo thuv cellulose, nplej straw cellulose thiab bagasse cellulose tau txais.
Lub purity yog siab dua 90%, thiab tawm los yog siab dua 40%; Nws tuaj yeem pom los ntawm kev tsom xam ntawm infrared spectrum thiab ultraviolet absorption spectrum uas impurities
Cov lignin thiab hemicellulose yog qhov yooj yim tshem tawm, thiab cov cellulose tau txais muaj kev purity siab; Nws tuaj yeem pom los ntawm X-ray diffraction tsom xam tias nws zoo ib yam li cov khoom siv cog qoob loo.
Hauv kev sib piv, tus txheeb ze crystallinity ntawm cov khoom tau txais tau zoo heev.
(2) Kev npaj thiab ua tus cwj pwm ntawm cellulose ethers. Siv ntoo thuv ntoo cellulose muab rho tawm los ntawm ntoo thuv sawdust ua raw khoom, ib qho kev sim ib zaug tau ua.
Cov concentrated alkali decrystallization pretreatment txheej txheem ntawm ntoo thuv cellulose tau optimized; thiab los ntawm kev tsim cov kev sim orthogonal thiab kev sim ib leeg, qhov
Cov txheej txheem rau kev npaj CMC, HEC thiab HECMC los ntawm ntoo thuv alkali cellulose tau optimized feem;
CMC nrog DS txog 1.237, HEC nrog MS txog 1.657, thiab HECMC nrog DS ntawm 0.869 tau txais. Raws li FTIR thiab H-NMR tsom xam, cov ether pawg tau muab tso rau hauv peb lub cellulose etherification khoom;
Cov ntaub ntawv siv lead ua ntawm cov dawb ethers CMC, HEC thiab HEECMC tag nrho hloov mus rau cellulose hom II, thiab cov crystallinity poob qis heev.
(3) Kev siv cov cellulose ether muab tshuaj. Peb hom cellulose ethers npaj nyob rau hauv cov txheej txheem kev pom zoo tau siv rau paj rwb ntaub
Luam nrog reactive dyes thiab muab piv nrog sodium alginate. Txoj kev tshawb nrhiav pom tias SA, CMC, HEC thiab HECMC plaub qhov laj thawj
Cov pastes yog tag nrho cov kua pseudoplastic, thiab cov pseudoplasticity ntawm peb cellulose ethers zoo dua li ntawm SA; qhov kev txiav txim ntawm paste tsim tus nqi ntawm plaub pastes
Nws yog: SA > CMC > HECMC > HEC. Hais txog cov nyhuv luam ntawv, CMC pom meej xim tawm los thiab nkag mus, luam ntawv tes
rhiab heev, luam ntawv xim ceev, thiab lwm yam zoo ib yam li SA, thiab tus nqi depaste ntawm CMC zoo dua SA;
SA zoo ib yam, tab sis HEC pom tseeb xim tawm los, permeability thiab rubbing ceev yog qis dua SA; HECMC luam ntawv xav, rub tsis kam
Cov xim nrawm nrawm rau rubbing zoo ib yam li SA, thiab qhov muab tshuaj tshem tawm yog siab dua SA, tab sis qhov pom tseeb xim tawm los thiab khaws cia ruaj khov ntawm HEECMC qis dua SA.
Lo lus tseem ceeb: cog pov tseg; cellulose; cellulose ether; etherification kev hloov kho; reactive dye printing;
Post lub sij hawm: Sep-26-2022