Cellulose ether yog chav kawm ntawm cov chav dej-soluble cov ntaub ntawv nqa los ntawm kev hloov tshuaj lom neeg ntawm ntuj cellulose. Cov cellulose cellulose muaj xws li methyl cellulose (MC), hydroxypropyl cellulose (HECTCC), lawv tau siv dav, tshuaj, tshuaj pleev ib ce thiab lwm thaj teb. Lub ntsiab me me ua lub tshuab tuab yuav muaj cov tshuaj thiab tshuaj lom neeg ntawm kev sib cuam tshuam ntawm cov qauv molecular thiab cov tshuaj.
1. Molecular qauv ntawm cellulose ether
Cellulose ether yog tsim los ntawm kev qhia sib txawv sib txawv (xws li methyl, hydroxyprropyl, thiab lwm yam) rau lub ntuj cellulose saw. Tus txheej txheem no khaws cov qauv kab ntawm cellulose tab sis hloov pauv cov solubility thiab kev daws teeb meem. Cov lus qhia ntawm cov neeg muaj kev cuam tshuam cellulose muaj solubility nyob hauv cov tshuaj, uas yog qhov tseem ceeb rau nws cov tuab tuab.
2. Molecular tus cwj pwm hauv kev daws teeb meem
Lub thickening nyhuv ntawm cellulose ntawm cellulose ntawm cov dej feem ntau yog los ntawm cov qauv viscosity siab tsim los ntawm nws cov lwg me hauv kev daws teeb meem. Cov txheej txheem tshwj xeeb muaj xws li:
2.1 o thiab ncab ntawm molecular chains
Thaum cellulose ether yog yaj hauv dej, nws macromolecular chains yuav rhaub vim yog dej. Cov chains molecular yuav ncab thiab nyob hauv lub ntim loj dua, nce lub viscosity ntawm kev daws teeb meem. Qhov kev ncab thiab o yog nyob ntawm hom thiab qib hloov pauv ntawm cov cellulose ether los hloov chaw, nrog rau qhov kub thiab siv tus nqi.
2.2 Kev Sib Koom Tes Hydrogen Hydrogen thiab Hydrophobic sib cuam tshuam
Cellulose ether molecular chains muaj ntau pawg ntawm cov pab pawg hydroxyl, uas tuaj yeem tsim cov lwg dej hauv hydrogen. Ib qho ntxiv, cov hloov chaw ntawm cellulose feem ntau muaj qee pab pawg hydrophobic tuaj yeem tsim cov dej hauv dej, yog li txhim kho lub viscosity ntawm kev daws. Cov nyhuv sib xyaw ua ke ntawm hydrogen bonds thiab hydrophobic sib txuas lus tso cai rau lub cellulose muaj kev sib xyaw kom haum lub xeev ruaj khov.
2.3 entanglement thiab lub cev crosslinking ntawm molecular chains
Cellulose ether molecular chains yuav tsim kev tawm tsam lub cev thiab cov entangolecular, thiab cov entangling nce viscosity ntawm kev daws teeb meem. Ib qho ntxiv, ntawm ntau dua cov kev xav, cellulose ither molecules tuaj yeem sau tus qauv zoo ib yam li kev sib tw ntawm lub cev, uas txuas ntxiv rau cov tshuaj viscosity ntawm kev daws.
3. Thickening txheej txheem hauv cov ntawv thov tshwj xeeb
3.1 Cov Ntaub Ntawv Hauv Tsev
Hauv cov ntaub ntawv hauv tsev, cov neeg muaj kev pab cuam cellulose feem ntau siv los ua cov thickeners hauv mortars thiab txheej. Lawv tuaj yeem nce kev tsim kho kev ua tau zoo thiab dej tuav tseg ntawm cov neeg nplua nuj, yog li txhim kho qhov yooj yim ntawm kev tsim kho thiab zoo kawg ntawm cov tsev. Cov nyhuv thickening ntawm cov cellulose cov neeg muaj kev pab nyob hauv cov ntawv thov no yog feem ntau los ntawm kev tsim cov kev daws teeb meem siab, ua kom nce qib ntxiv thiab tawm tsam cov khoom lag luam tawm ntawm cov ntaub ntawv.
3.2 Khoom Noj Khoom Haus
Nyob rau hauv kev lag luam khoom noj khoom haus, pab pawg cellulose xws li hydroxyprropy) thiab hydroxyethyl cellulose (HEC) thiab cov stabilizers thiab emulsifiers. Cov kev daws teeb meem siab-vascosity lawv daim ntawv hauv cov zaub mov tuaj yeem nce cov khoom noj thiab cov khoom noj khoom haus, thaum tshem tawm cov khoom noj khoom haus uas tsis tuaj yeem tiv thaiv stratification thiab dej nag.
3.3 tshuaj thiab tshuaj pleev ib ce
Nyob rau hauv thaj chaw ntawm cov tshuaj thiab cov tshuaj pleev ib ce, cellulose cov neeg muaj kev hais ua ke yog siv los ua cov neeg sawv cev thiab cov tuab tuab rau kev npaj cov tshuaj xws li tshuaj pleev cov tshuaj, tshuaj pleev thiab cream. Nws cov txheej txheem tuab yuav nyob ntawm nws cov kev coj cwj pwm sib txawv hauv dej thiab cov qauv siv viscosity siab tsim, muab viscosity thiab kev ruaj khov uas yuav tsum tau los ntawm cov khoom.
4. Cov cawv ntawm ib puag ncig ntawm cov nyhuv thickening
Lub thickening nyhuv ntawm cellulose cov cellulose ether yog cuam tshuam los ntawm ntau qhov chaw ib puag ncig, suav nrog qhov kub thiab txias, pus muaj zog thiab ionic lub zog ntawm kev daws teeb meem. Cov xwm txheej no tuaj yeem hloov kho qib qis thiab kev sib txuam nrog kev sib txuam ntawm lub cellulose ether molecular saw, yog cuam tshuam rau viscosity ntawm kev daws. Piv txwv li, kub kub feem ntau txo cov viscosity ntawm cellulose ntawm cellule daws, thaum hloov hauv lub xeev ionization, yog li cuam tshuam lub viscosity.
Qhov kev thov dav ntawm cellulose ether vim yog qhov tuab yog vim nws cov qauv molecular thiab cov qauv siv viscosity siab tsim hauv dej. Los ntawm kev nkag siab nws cov tuab tuab hauv cov ntawv thov sib txawv, nws daim ntawv thov ua tau zoo hauv ntau daim teb muaj kev kho tau zoo. In the future, with the in-depth study of the relationship between cellulose ether structure and performance, it is expected that cellulose ether products with better performance will be developed to meet the needs of different fields.
Lub Sijhawm Post: Feb-17-2025