Ukusukela ekufikeni kwedayi esebenzayo kwinkulungwane edlulileyo, i-sodium alginate (SA) ibe yeyona nto iphambili yokuprintwa kwedayi kwilaphu lomqhaphu.
ncamathelisa. Nangona kunjalo, ngokuphuculwa okuqhubekayo kweemfuno zabantu zokushicilela umphumo, i-alginate yesodium njenge-paste yokushicilela ayixhathisi kwi-asidi eqinile kunye ne-alkali.
Kwaye i-viscosity yesakhiwo incinci, ngoko ke ukusetyenziswa kwayo kwisetyhula (flat) ukuprintwa kwesikrini kunqunyelwe kwinqanaba elithile;
Ixabiso le-alginate ye-sodium nalo liyenyuka, ngoko ke abantu baye baqala uphando kwiindlela ezizezinye, i-cellulose ether yenye yezona zinto zibalulekileyo.
ububele. Kodwa ngoku eyona nto iphambili ekrwada esetyenziselwa ukulungiswa kwe-cellulose ether yikotoni, imveliso yayo iyehla, kwaye ixabiso liyanda.
Ngaphezu koko, i-etherifying agents ezisetyenziswa ngokuqhelekileyo ezifana ne-chloroacetic acid (ityhefu ephezulu) kunye ne-ethylene oxide (i-carcinogenic) nazo ziyingozi kakhulu kumzimba womntu kunye nokusingqongileyo.
Ngenxa yoko, kweli phepha, i-cellulose ether ikhutshwe kwinkunkuma yezityalo, kwaye i-sodium chloroacetate kunye ne-2-chloroethanol isetyenziswe njenge-etherifying agents ukulungiselela i-carboxylate.
Iintlobo ezintathu zeentsinga: i-methyl cellulose (CMC), i-hydroxyethyl cellulose (HEC) kunye ne-hydroxyethyl carboxymethyl cellulose (HECMC)
Ntathui-cellulose etherskwaye i-SA yasetyenziswa kushicilelo lwedayi yelaphu lomqhaphu olusebenzayo, kwaye iziphumo zabo zokuprinta zathelekiswa kwaye zafundwa.
iziqhamo. Umxholo wophando oluphambili lwethisisi yahlulwe yangamacandelo amathathu:
(1) Khupha i-cellulose kwinkunkuma yezityalo. Ngokunyangwa kwenkunkuma yezityalo ezintlanu (umququ werayisi, ikhoba lerayisi, umququ wengqolowa, i-pine sawdust
kunye ne-bagasse) yokumisela kunye nohlalutyo lwamacandelo (ukufuma, uthuthu, i-lignin, i-cellulose kunye ne-hemicellulose), ekhethiweyo.
Izixhobo ezintathu zezityalo ezimele (i-pine sawdust, i-wheat straw kunye ne-bagasse) zisetyenziselwa ukukhupha i-cellulose, kwaye i-cellulose iyakhutshwa.
Inkqubo yaphuculwa; phantsi kweemeko zenkqubo ephuculweyo, izigaba ze-pine cellulose, i-wheat straw cellulose kunye ne-bagasse cellulose zifunyenwe.
Ubunyulu bungaphezulu kwe-90%, kwaye isivuno singaphezulu kwe-40%; inokubonwa kuhlalutyo lwe-infrared spectrum kunye ne-ultraviolet absorption spectrum ukuba ukungcola
I-lignin kunye ne-hemicellulose zisuswe ngokusisiseko, kwaye i-cellulose efunyenweyo inobunyulu obuphezulu; kunokubonwa kuhlalutyo lwe-X-reyi ye-diffraction ukuba iyafana nesityalo ekrwada.
Ngokuthelekisa, i-crystallinity enxulumene nemveliso efunyenweyo iphuculwe kakhulu.
(2) Ukulungiswa kunye nokubonakaliswa kwe-cellulose ethers. Kusetyenziswa iselulosi yeplanga yompayina ekhutshwe kwi-pine sawdust njengesixhobo ekrwada, ukulinga into enye yenziwa.
Inkqubo egxininisiweyo ye-alkali decrystallization pretreatment yepine cellulose yaphuculwa; kwaye ngokuyila imifuniselo ye-orthogonal kunye nemifuniselo yento enye, i
Iinkqubo zokulungiselela i-CMC, i-HEC kunye ne-HECMC ukusuka kwi-pine wood alkali cellulose zalungiswa ngokulandelelanayo;
I-CMC ene-DS ukuya kwi-1.237, i-HEC ene-MS ukuya kwi-1.657, kunye ne-HECMC ene-DS ye-0.869 yafunyanwa. Ngokutsho kwe-FTIR kunye nohlalutyo lwe-H-NMR, amaqela e-ether ahambelanayo afakwe kwiimveliso ezintathu ze-cellulose etherification;
Iifom ze-crystal ze-ethers ezicacileyo ze-CMC, i-HEC kunye ne-HEECMC zonke zitshintshile kwi-cellulose uhlobo lwe-II, kwaye i-crystallinity yehla kakhulu.
(3) Ukusetyenziswa kwe-cellulose ether paste. Iintlobo ezintathu ze-cellulose ethers ezilungiselelwe phantsi kweemeko ezifanelekileyo zenkqubo zazisetyenziselwa ilaphu lomqhaphu
Iprintwe ngeedayi ezisebenzayo kwaye zithelekiswe ne-alginate yesodium. Uphononongo lufumanise ukuba i-SA, CMC, HEC kunye ne-HECMC zine causative
Iipastes zonke pseudoplastic fluids, kunye pseudoplasticity of ezintathu cellulose ethers ingcono kunaleyo SA; ulandelelwano lwemilinganiselo yokwenziwa kwentlama yeentlama ezine
Yi: SA > CMC > HECMC > HEC. Ngokubhekiselele kwisiphumo soshicilelo, i-CMC ibonakala isivuno sombala kunye nokungena, ukuprinta ngesandla
Uvakalelo, ukukhawuleza kombala woshicilelo, njl.njl. ziyafana ne-SA, kwaye ireyithi ye-depaste ye-CMC ingcono kune-SA;
I-SA iyafana, kodwa i-HEC ebonakalayo isivuno sombala, ukunyanzeliswa kunye nokukhawuleza kokuxubha kungaphantsi kuno-SA; I-HECMC yoshicilelo ivakalelwa, i-rub resistance
Ukukhawuleza kombala ukuhlikihla kuyafana ne-SA, kwaye izinga lokususa intlama liphezulu kune-SA, kodwa isivuno esibonakalayo sombala kunye nozinzo lokugcina lwe-HEECMC lungaphantsi kuno-SA.
Amagama aphambili: inkunkuma yezityalo; i-cellulose; i-cellulose ether; ukuguqulwa kwe-etherification; ukuprintwa kwedayi esebenzayo;
Ixesha lokuposa: Sep-26-2022