Iziphumo zovavanyo lwe-Cellulose ether

Ngokusebenzisa uhlalutyo kunye nesishwankathelo seziphumo zovavanyo lwe-cellulose ether kwizahluko ezithathu, izigqibo eziphambili zezi zilandelayo:

5.1 Isiphelo

1. I-Cellulose etheukukhupha kwi-r kwizityalo ezikrwada

(1) Izinto ezisetyenziswa kwizityalo ezintlanu (ukufuma, uthuthu, umgangatho womthi, i-cellulose kunye ne-hemicellulose) zilinganisiwe, kwaye kukhethwe izinto ezintathu ezimele izityalo, uthuli lwepayini kunye nomququ wengqolowa.

kunye ne-bagasse yokukhupha i-cellulose, kwaye inkqubo yokukhupha i-cellulose yenziwe ngcono. Phantsi kweemeko zenkqubo eziphuculweyo,

Ubumsulwa be-lignocellulose, i-wheat straw cellulose kunye ne-bagasse cellulose zonke bezingaphezulu kwe-90%, kwaye isivuno sazo singaphezulu kwe-40%.

(2) Ukusuka kuhlalutyo lwe-infrared spectrum, kunokubonwa ukuba emva konyango, iimveliso ze-cellulose zithathwe kwi-wheat straw, i-bagasse kunye ne-pine sawdust

Kwi-1510 cm-1 (ukungcangcazela kwamathambo kweringi yebenzene) kwaye malunga ne-1730 cm-1 (ukufunxwa kokungcangcazela okunwebekayo kwe-carbonyl C=O engadibaniyo)

Bekungekho ziqongo, nto leyo ebonisa ukuba i-lignin kunye ne-hemicellulose kwimveliso ekhutshiweyo zisusiwe ngokusisiseko, kwaye i-cellulose efunyenweyo yayinobunyulu obuphezulu.

Kuyabonakala kwi-external absorption spectrum ukuba umxholo we-lignin uyancipha rhoqo emva kwenyathelo ngalinye lonyango, kwaye ukufunxwa kwe-UV kwe-cellulose efunyenweyo kuyancipha.

I-spectral curve efunyenweyo yayikufutshane ne-ultraviolet absorption spectral curve ye-blank potassium permanganate, nto leyo ebonisa ukuba i-cellulose efunyenweyo yayicocekile.

Uhlalutyo lwe-X-ray diffraction lubonise ukuba i-crystallinity ye-cellulose yemveliso efunyenweyo iphuculwe kakhulu.

2. Ukulungiswa kwee-ether ze-cellulose

(1) Uvavanyo lwe-single factor lusetyenzisiwe ukuphucula inkqubo ye-concentrated alkali decrystallization pretreatment ye-pine cellulose;

Kwenziwe uvavanyo lwe-orthogonal kunye novavanyo lwe-single-factor ekulungiseleleni i-CMC, i-HEC kunye ne-HECMC kwi-alkali cellulose yomthi wepayini, ngokwahlukeneyo.

Ukulungiswa. Phantsi kweenkqubo ezifanelekileyo zokulungiselela, i-CMC ene-DS ukuya kuthi ga kwi-1.237, i-HEC ene-MS ukuya kuthi ga kwi-1.657 ifunyenwe.

kunye ne-HECMC ene-DS ye-0.869. (2) Ngokutsho kohlalutyo lwe-FTIR, xa kuthelekiswa ne-cellulose yomthi wepayini yokuqala, i-carboxymethyl ifakwe ngempumelelo kwi-cellulose ether CMC.

Kwi-cellulose ether HEC, iqela le-hydroxyethyl liqhagamshelwe ngempumelelo; kwi-cellulose ether HECMC, iqela le-hydroxyethyl liqhagamshelwe ngempumelelo

Amaqela eCarboxymethyl kunye nehydroxyethyl.

(3) Kunokufumaneka kuhlalutyo lwe-H-NMR ukuba iqela le-hydroxyethyl lingeniswa kwi-HEC yemveliso, kwaye i-HEC ifunyanwa ngokubala okulula.

inqanaba lokutshintsha i-molar.

(4) Ngokwe-XRD analysis, xa kuthelekiswa ne-cellulose yomthi wepayini yokuqala, ii-cellulose ethers CMC, HEC kunye ne-HEECMC zine-

Iifom zekristale zonke zatshintsha zaba yi-cellulose type II, kwaye i-crystallinity yehla kakhulu.

3. Ukusetyenziswa kwe-cellulose ether paste

(1) Iipropati ezisisiseko zentlama yokuqala: i-SA, i-CMC, i-HEC kunye ne-HECMC zonke zi-pseudoplastic fluids, kwaye

I-pseudoplasticity yee-ether ezintathu ze-cellulose ingcono kuneye-SA, kwaye xa ithelekiswa ne-SA, inexabiso eliphantsi le-PVI, elifaneleke ngakumbi ekuprinteni iipateni ezincinci.

Intyatyambo; ukulandelelana kwesantya sokwakheka kwentlama kwezi ntlama zine yile: SA > CMC > HECMC > HEC; amandla okugcina amanzi entlama yokuqala yeCMC,

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Ukuhambelana kwe-urea kunye netyuwa echasene nokudaya i-S kufana ne-SA, kwaye uzinzo lokugcina lwe-CMC original paste lungcono kune-SA, kodwa

Ukuhambelana kwe-HEC raw paste kubi kakhulu kunoko kwe-SA;

Ukuhambelana kunye nokuzinza kokugcinwa kwe-sodium bicarbonate kubi kune-SA;

I-SA iyafana, kodwa amandla okugcina amanzi, ukuhambelana ne-sodium bicarbonate kunye nokuzinza kokugcinwa kwe-HEECMC intlama eluhlaza kuphantsi kune-SA. (2) Ukusebenza kokuprinta intlama: Imveliso yombala ebonakalayo ye-CMC kunye nokuvuleka kwayo, ukuvakala kokuprinta, ukukhawuleza kombala wokuprinta, njl.njl. zonke ziyafana ne-SA.

kwaye izinga lokuchithwa kwe-CMC lingcono kunele-SA; izinga lokuchithwa kwe-depaste kunye nemvakalelo yokuprinta ye-HEC zifana ne-SA, kodwa inkangeleko ye-HEC ingcono kuneye-SA.

Umthamo wombala, ukuvuleka kunye nokukhawuleza kombala ukuya ekuhlikihleni kuphantsi kune-SA; Imvakalelo yokuprinta ye-HECMC, ukukhawuleza kombala ukuya ekuhlikihleni kufana ne-SA;

Umlinganiselo wepaste uphezulu kune-SA, kodwa isivuno sombala esibonakalayo kunye nokuzinza kokugcinwa kwe-HECMC kuphantsi kune-SA.

5.2 Iingcebiso

Ukusuka kwisiphumo sokusetyenziswa kwe-5.1 cellulose ether paste ingafunyanwa, i-cellulose ether paste ingasetyenziswa kwi-active

Iipastes zokuprinta idayi, ingakumbi ii-ether ze-anionic cellulose. Ngenxa yokungeniswa kweqela le-hydrophilic carboxymethyl, i-six-members

Ukusabela kweqela le-hydroxyl eliphambili kwiringi, kunye ne-negative charge emva kwe-ionization ngaxeshanye, kunokukhuthaza ukudaywa kweefayibha ngeedayi ezisebenzayo. Nangona kunjalo, iyonke,

Isiphumo sokusebenzisa i-cellulose ether printing paste asilunganga kangako, ikakhulu ngenxa yobungakanani bokutshintshwa okanye ukutshintshwa kwe-molar ye-cellulose ether.

Ngenxa yezinga eliphantsi lokutshintshwa, ukulungiswa kwee-ether ze-cellulose ezinezinga eliphezulu lokutshintshwa okanye izinga eliphezulu lokutshintshwa kwe-molar kufuna uphando olongezelelekileyo.