Los ntawm kev txheeb xyuas thiab cov ntsiab lus ntawm cov txiaj ntsig ntawm cellulose ether hauv peb tshooj, cov lus xaus tseem ceeb yog raws li hauv qab no:
5.1 Xaus
1. Cellulose ether extraction los ntawm cov nroj tsuag raw khoom
(1) Lub Cheebtsam ntawm tsib cov ntaub ntawv cog qoob loo (moisture, tshauv, ntoo zoo, cellulose thiab hemicellulose) raug ntsuas, thiab peb cov khoom siv cog ntoo, ntoo thuv sawdust thiab nplej straw, raug xaiv.
thiab bagasse extract cellulose, thiab cov txheej txheem ntawm cellulose extraction tau optimized. Nyob rau hauv cov txheej txheem optimized, lub
Cov txheeb ze purity ntawm lignocellulose, nplej straw cellulose thiab bagasse cellulose yog tag nrho cov saum toj no 90%, thiab lawv yields tag nrho cov saum toj no 40%.
(2) Los ntawm kev tsom xam ntawm cov infrared spectrum, nws tuaj yeem pom tias tom qab kev kho mob, cov khoom siv cellulose muab rho tawm los ntawm cov nplej straw, bagasse thiab ntoo thuv sawdust.
Ntawm 1510 cm-1 (skeletal vibration ntawm lub nplhaib benzene) thiab nyob ib ncig ntawm 1730 cm-1 (stretching vibration absorption ntawm non-conjugated carbonyl C = O)
Tsis muaj qhov siab tshaj plaws, qhia tau hais tias lignin thiab hemicellulose hauv cov khoom muab rho tawm tau raug tshem tawm, thiab cov cellulose tau txais muaj purity siab. ntawm ntshav
Nws tuaj yeem pom los ntawm kev nqus sab nraud uas cov ntsiab lus ntawm lignin txo qis tsis tu ncua tom qab txhua kauj ruam ntawm kev kho mob, thiab UV nqus ntawm cov cellulose tau txo qis.
Qhov tau txais spectral nkhaus yog ze rau ultraviolet absorption spectral nkhaus ntawm dawb paug poov tshuaj permanganate, qhia tau hais tias cov cellulose tau kuj ntshiab. los ntawm X
X-ray diffraction tsom xam pom tias tus txheeb ze crystallinity ntawm cov khoom tau txais cellulose tau zoo heev.
2. Kev npaj ntawm cellulose ethers
(1) Qhov kev sim ib zaug tau siv los ua kom zoo dua cov txheej txheem alkali decrystallization pretreatment ntawm ntoo thuv cellulose;
Kev sim Orthogonal thiab ib qho kev sim ib leeg tau ua tiav ntawm kev npaj CMC, HEC thiab HECMC los ntawm ntoo thuv alkali cellulose, raws li.
kev ua kom zoo. Raws li cov txheej txheem kev npaj kom zoo, CMC nrog DS txog 1.237, HEC nrog MS txog 1.657 tau txais.
thiab HECMC nrog DS ntawm 0.869. (2) Raws li FTIR tsom xam, piv nrog cov thawj ntoo thuv ntoo cellulose, carboxymethyl tau ntse ntxig rau hauv cellulose ether CMC.
Hauv cellulose ether HEC, pawg hydroxyethyl tau txuas nrog zoo; nyob rau hauv cellulose ether HECMC, pawg hydroxyethyl tau ntse txuas
Carboxymethyl thiab hydroxyethyl pawg.
(3) Nws tuaj yeem tau txais los ntawm H-NMR tsom xam tias pawg hydroxyethyl tau nkag rau hauv cov khoom HEC, thiab HEC tau txais los ntawm kev suav yooj yim.
molar degree ntawm kev hloov.
(4) Raws li XRD tsom xam, piv nrog cov ntoo thuv ntoo cellulose qub, cellulose ethers CMC, HEC thiab HEECMC muaj
Cov ntaub ntawv siv lead ua tag nrho hloov mus rau cellulose hom II, thiab crystallinity txo qis.
3. Daim ntawv thov ntawm cellulose ether muab tshuaj
(1) Cov khoom siv tseem ceeb ntawm cov khoom qub: SA, CMC, HEC thiab HECMC yog tag nrho cov kua dej pseudoplastic, thiab
Lub pseudoplasticity ntawm peb lub cellulose ethers zoo dua li ntawm SA, thiab piv nrog SA, nws muaj qis dua PVI tus nqi, uas yog tsim nyog rau kev luam ntawv zoo.
Paj; qhov kev txiav txim ntawm qhov muab tshuaj txhuam tus nqi ntawm plaub pastes yog: SA > CMC > HECMC > HEC; Lub peev xwm tuav dej ntawm CMC thawj muab tshuaj,
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Kev sib xyaw ua ke ntawm urea thiab anti-staining ntsev S zoo ib yam li SA, thiab kev ruaj khov ntawm CMC thawj muab tshuaj yog zoo dua li SA, tab sis
Kev sib xyaw ua ke ntawm HEC raw muab tshuaj yog phem dua li ntawm SA;
Kev sib raug zoo thiab kev ruaj khov ntawm sodium bicarbonate yog qhov phem dua li SA;
SA zoo ib yam, tab sis lub peev xwm tuav dej, sib haum nrog sodium bicarbonate thiab ruaj khov ntawm HEECMC raw paste yog qis dua SA. (2) Printing kev ua tau zoo ntawm paste: CMC pom tseeb xim tawm los thiab permeability, luam ntawv xav, luam ntawv xim ceev, thiab lwm yam yog tag nrho cov piv rau SA.
thiab tus nqi depaste ntawm CMC zoo dua li ntawm SA; tus nqi depaste thiab luam ntawv xav ntawm HEC zoo ib yam li SA, tab sis cov tsos ntawm HEC zoo dua li ntawm SA.
Xim ntim, permeability thiab xim ceev rau rubbing yog qis dua SA; HECMC luam ntawv xav tau, xim ceev ceev rau kev txhuam zoo ib yam li SA;
Qhov sib piv piv yog siab dua SA, tab sis qhov pom tseeb xim tawm los thiab kev ruaj khov ntawm HECMC yog qis dua SA.
5.2 Cov lus pom zoo
Los ntawm daim ntawv thov cov nyhuv ntawm 5.1 cellulose ether muab tshuaj yuav tau, cellulose ether muab tshuaj yuav siv tau nyob rau hauv active
Dye printing pastes, tshwj xeeb tshaj yog anionic cellulose ethers. Vim qhov kev taw qhia ntawm hydrophilic pawg carboxymethyl, rau-tus tswv cuab
Lub reactivity ntawm thawj pawg hydroxyl ntawm lub nplhaib, thiab tus nqi tsis zoo tom qab ionization tib lub sijhawm, tuaj yeem txhawb kev dyeing ntawm fibers nrog reactive dyes. Txawm li cas los xij, ntawm tag nrho,
Daim ntawv thov cov nyhuv ntawm cellulose ether luam ntawv paste yog tsis zoo heev, feem ntau yog vim cov degree ntawm hloov los yog molar hloov ntawm cellulose ether.
Vim qhov kev hloov pauv qis qis, kev npaj ntawm cellulose ethers nrog qib siab hloov pauv lossis qib siab molar hloov pauv yuav tsum tau kawm ntxiv.
Post lub sij hawm: Oct-08-2022