Viscosity yog ib qho cuab yeej tseem ceeb hauv kev nkag siab txog tus cwj pwm ntawm cov kua dej, suav nrog cellulose ethers.Cellulose ethers yog ib pawg ntawm cov organic tebchaw muab los ntawm cellulose, ib txwm tshwm sim polymer pom nyob rau hauv cov nroj tsuag.Cov ethers no tau siv dav hauv ntau qhov kev lag luam vim lawv cov khoom tshwj xeeb, suav nrog kev hloov kho viscosity.
1. Taw qhia rau Cellulose Ethers:
Cellulose ethers yog derivatives ntawm cellulose tau los ntawm kev hloov tshuaj.Piv txwv xws li methylcellulose, ethylcellulose, hydroxypropylcellulose, thiab hydroxyethylcellulose.Cov tebchaw no yog tus cwj pwm los ntawm lawv qhov hnyav molecular thiab muaj cov pab pawg hydroxyl, uas ua rau lawv soluble hauv dej thiab cov kuab tshuaj organic sib txawv.
2. Qhov tseem ceeb ntawm viscosity:
Viscosity yog ib qho kev ntsuas ntawm cov kua dej tsis kam ntws.Nyob rau hauv cov ntaub ntawv ntawm cellulose ethers, viscosity plays lub luag haujlwm tseem ceeb hauv kev txiav txim siab lawv qhov tsim nyog rau kev siv sib txawv.Piv txwv li, hauv kev lag luam khoom noj khoom haus, viscosity cuam tshuam rau kev ntxhib los mos thiab lub qhov ncauj ntawm cov khoom xws li kua ntses thiab hnav khaub ncaws.Hauv cov tshuaj, nws cuam tshuam qhov sib xws thiab kis tau ntawm cov tshuaj pleev thiab cov tshuaj pleev.Yog li, kev nkag siab thiab tswj cov viscosity yog qhov tseem ceeb rau kev ua kom cov khoom ua tau zoo.
3. Cov yam ntxwv cuam tshuam rau viscosity:
Ntau yam cuam tshuam rau viscosity ntawm cellulose ethers:
Molecular Luj: Ntau dua qhov hnyav molecular feem ntau ua rau muaj viscosity ntau dua vim muaj cov saw txuas ntxiv.
Qib Hloov: Cov qib hloov ntawm ether pawg ntawm cov pob txha cellulose cuam tshuam rau solubility thiab, yog li, viscosity.
Kub: Viscosity feem ntau txo nrog qhov kub thiab txias vim qhov kev sib cuam tshuam ntawm molecular txo.
Kev Cuam Tshuam: Cov concentration ntau dua ntawm cellulose ethers feem ntau ua rau muaj viscosity ntau dua, tom qab kev sib raug zoo uas tsis yog-linear.
4. Kev ntsuas kev ntsuas:
Kev ntsuas viscosity tuaj yeem ntsuas tau siv ntau yam txuj ci:
Rotational Viscometry: Feem ntau siv rau kev daws teeb meem thiab kev ncua, txoj kev no suav nrog kev ntsuas lub zog uas yuav tsum tau tig lub ntxaiv hauv cov kua dej.
Capillary Viscometry: Cov txheej txheem no ntsuas lub sijhawm siv rau cov kua dej ntws los ntawm lub raj capillary nyob rau hauv ib qho kev ntsuas siab.
Rheology: Kev ntsuas Rheological muab kev nkag siab txog yuav ua li cas cov khoom deforms nyob rau hauv kev ntxhov siab, suav nrog shear thiab elongational viscosity.
5. Kev siv ntawm Cellulose Ethers:
Cellulose ethers pom cov ntawv thov thoob plaws ntau hom kev lag luam:
Khoom noj khoom haus: Siv ua thickeners, stabilizers, thiab emulsifiers hauv cov khoom xws li ice cream, yogurt, thiab nyias hnav khaub ncaws.
Pharmaceuticals: Ua hauj lwm raws li binders, disintegrants, thiab zaj duab xis qub nyob rau hauv cov ntsiav tshuaj formulations, tshuaj pleev, thiab suspensions.
Kev tsim kho: Ntxiv rau cov cement thiab mortar los txhim kho kev ua haujlwm, tuav dej, thiab adhesion.
Kev Kho Tus Kheej: Muaj nyob rau hauv cov tshuaj pleev ib ce, tshuaj zawv plaub hau, thiab tshuaj pleev ib ce rau lawv cov thickening thiab gelling zog.
6. Yav Tom Ntej Trends and Challenges:
Qhov kev thov rau cellulose ethers yuav tsum loj hlob, uas tau tsav los ntawm kev siv ntxiv hauv ntsuab chemistry, biomedicine, thiab cov ntaub ntawv siab heev.Txawm li cas los xij, cov kev sib tw xws li kev sib tw nqi, kev txhawj xeeb txog kev tswj hwm, thiab kev xav tau ntawm kev tsim khoom thiab kev tsim khoom muaj nyob.
7. Xaus:
viscosity ntawm cellulose ethers yog ib qho tseem ceeb parameter uas cuam tshuam lawv cov kev ua tau zoo nyob rau hauv ntau yam kev siv.Nkag siab txog yam cuam tshuam rau viscosity thiab siv cov txheej txheem ntsuas tsim nyog yog qhov tseem ceeb rau kev txhim kho cov khoom tsim thiab cov txheej txheem.Raws li kev lag luam txuas ntxiv tsim kho tshiab, cellulose ethers yuav ua lub luag haujlwm tseem ceeb hauv kev txhim kho yav tom ntej ntawm cov ntaub ntawv tshawb fawb thiab thev naus laus zis.
Lub viscosity ntawm cellulose ethers yog ib qho nyuaj tab sis tseem ceeb nam uas cuam tshuam lawv kev ua tau zoo nyob rau hauv ntau yam lag luam.Los ntawm kev nkag siab txog nws qhov tseem ceeb, yam cuam tshuam rau nws, kev ntsuas kev ntsuas, thiab kev siv, cov kws tshawb fawb thiab cov kws kho mob tuaj yeem siv cellulose ethers hauv ntau hom kev lag luam, pab txhawb kev nce qib hauv cov ntaub ntawv tshawb fawb thiab thev naus laus zis.
Lub sij hawm xa tuaj: Mar-29-2024