Carboxymethyl cellulose (CMC) thiab hydroxyethyl cellulose (HEC) yog ob hom cellulose derivatives, uas yog siv dav hauv zaub mov, tshuaj, tshuaj pleev ib ce, khoom siv hauv tsev thiab lwm yam. Txawm hais tias lawv yog ob qho tib si muab los ntawm ntuj cellulose thiab tau los ntawm kev hloov kho tshuaj, muaj qhov sib txawv ntawm cov qauv tshuaj, cov khoom siv physicochemical, daim ntawv thov teb thiab cov txiaj ntsig ua haujlwm.
1. Cov qauv tshuaj
Lub ntsiab yam ntxwv ntawm carboxymethyl cellulose (CMC) yog cov hydroxyl pawg ntawm cov cellulose molecules hloov los ntawm carboxymethyl (-CH2COOH) pawg. Qhov kev hloov kho tshuaj no ua rau CMC tsis tshua muaj dej-soluble, tshwj xeeb tshaj yog nyob rau hauv dej los tsim cov kua nplaum colloidal. Lub viscosity ntawm nws cov tshuaj yog ze ze rau nws cov degree ntawm kev hloov pauv (xws li degree ntawm carboxymethyl hloov).
Hydroxyethyl cellulose (HEC) yog tsim los ntawm kev hloov cov pawg hydroxyl hauv cellulose nrog hydroxyethyl (-CH2CH2OH). Cov pab pawg hydroxyethyl hauv HEC molecule nce cov dej solubility thiab hydrophilicity ntawm cellulose, thiab tuaj yeem tsim cov gel hauv qee yam mob. Cov qauv no ua rau HEC pom zoo thickening, ncua kev kawm ntawv thiab stabilization teebmeem nyob rau hauv aqueous tov.
2. Lub cev thiab tshuaj muaj zog
Dej solubility:
CMC tuaj yeem yaj tag nrho hauv cov dej txias thiab dej kub los tsim cov pob tshab lossis cov kua dej sib xyaw. Nws cov tshuaj muaj viscosity siab, thiab viscosity hloov nrog kub thiab pH nqi. HEC kuj tuaj yeem yaj hauv dej txias thiab kub, tab sis piv nrog CMC, nws qhov kev sib cais qeeb qeeb thiab nws yuav siv sij hawm ntev dua los tsim ib qho kev daws teeb meem. Cov tshuaj viscosity ntawm HEC yog qhov tsawg, tab sis nws muaj ntsev zoo dua thiab ruaj khov.
Kev kho viscosity:
Lub viscosity ntawm CMC yog yooj yim cuam tshuam los ntawm pH tus nqi. Nws feem ntau yog siab dua nyob rau hauv nruab nrab lossis alkaline tej yam kev mob, tab sis lub viscosity yuav txo qis nyob rau hauv muaj zog acidic tej yam kev mob. Lub viscosity ntawm HEC tsis tshua cuam tshuam los ntawm pH tus nqi, muaj ntau yam pH ruaj khov, thiab tsim nyog rau kev siv nyob rau hauv ntau yam acidic thiab alkaline tej yam kev mob.
ntsev kuj:
CMC yog rhiab heev rau ntsev, thiab muaj ntsev yuav txo cov viscosity ntawm nws cov tshuaj. HEC, ntawm qhov tod tes, nthuav tawm cov ntsev muaj zog thiab tseem tuaj yeem tuav cov nyhuv thickening zoo nyob rau hauv ib puag ncig ntsev. Yog li ntawd, HEC muaj cov txiaj ntsig zoo hauv cov tshuab uas yuav tsum tau siv cov ntsev.
3. Cov chaw thov
Kev lag luam zaub mov:
CMC yog dav siv hauv kev lag luam khoom noj khoom haus ua cov thickener, stabilizer thiab emulsifier. Piv txwv li, hauv cov khoom xws li dej khov, dej haus, jams, thiab kua ntses, CMC tuaj yeem txhim kho qhov saj thiab ruaj khov ntawm cov khoom. HEC tsis tshua muaj siv nyob rau hauv kev lag luam khoom noj khoom haus thiab feem ntau yog siv rau hauv qee cov khoom uas muaj cov kev cai tshwj xeeb, xws li cov khoom noj muaj calorie tsawg thiab cov khoom noj tshwj xeeb.
Tshuaj thiab tshuaj pleev ib ce:
CMC feem ntau yog siv los npaj cov ntsiav tshuaj tso tawm cov tshuaj, cov kua muag muag, thiab lwm yam, vim nws cov biocompatibility zoo thiab kev nyab xeeb. HEC yog dav siv nyob rau hauv cov tshuaj pleev ib ce xws li tshuaj pleev ib ce, cream thiab tshuaj zawv plaub hau vim nws zoo heev film-forming thiab moisturizing zog, uas muaj peev xwm muab ib tug zoo xav thiab moisturizing nyhuv.
Cov khoom siv hauv tsev:
Hauv cov khoom siv hauv tsev, ob qho tib si CMC thiab HEC tuaj yeem siv los ua cov thickeners thiab dej retainers, tshwj xeeb tshaj yog nyob rau hauv cov cement thiab gypsum-based cov ntaub ntawv. HEC yog siv dav hauv cov khoom siv hauv tsev vim nws cov ntsev zoo thiab ruaj khov, uas tuaj yeem txhim kho kev tsim kho thiab ua haujlwm ntev ntawm cov ntaub ntawv.
Roj rho tawm:
Nyob rau hauv cov roj extraction, CMC, raws li ib tug additive rau drilling kua, yuav zoo tswj lub viscosity thiab dej poob ntawm av nkos. HEC, vim nws cov ntsev zoo dua thiab cov khoom ua kom tuab, tau dhau los ua ib qho tseem ceeb hauv cov tshuaj oilfield, siv rau hauv cov dej drilling thiab cov kua dej tawg los txhim kho kev ua haujlwm thiab cov txiaj ntsig kev lag luam.
4. Kev tiv thaiv ib puag ncig thiab biodegradability
Ob leeg CMC thiab HEC yog muab los ntawm ntuj cellulose thiab muaj biodegradability zoo thiab ib puag ncig tus phooj ywg. Nyob rau hauv ib puag ncig ntuj, lawv tuaj yeem degraded los ntawm cov kab mob me me los tsim cov khoom tsis zoo xws li carbon dioxide thiab dej, txo cov pa phem rau ib puag ncig. Tsis tas li ntawd, vim tias lawv tsis muaj tshuaj lom thiab tsis muaj teeb meem, lawv tau siv dav hauv cov khoom lag luam uas tuaj yeem cuam tshuam ncaj qha rau tib neeg lub cev, xws li zaub mov, tshuaj thiab tshuaj pleev ib ce.
Txawm hais tias carboxymethyl cellulose (CMC) thiab hydroxyethyl cellulose (HEC) yog ob qho tib si derivatives ntawm cellulose, lawv muaj qhov sib txawv tseem ceeb hauv cov qauv tshuaj, cov khoom siv physicochemical, daim ntawv thov teb thiab kev ua haujlwm zoo. CMC yog dav siv nyob rau hauv cov zaub mov, tshuaj, roj extraction thiab lwm yam teb vim nws siab viscosity thiab susceptibility rau ib puag ncig influences. HEC, txawm li cas los xij, yog siv ntau dua hauv cov tshuaj pleev ib ce, cov khoom siv hauv tsev, thiab lwm yam vim nws cov ntsev zoo heev, kev ruaj ntseg thiab cov khoom ua yeeb yaj kiab. Thaum xaiv siv nws, nws yog ib qho tsim nyog los xaiv qhov tsim nyog tshaj plaws cellulose derivative raws li qhov tshwj xeeb daim ntawv thov scenario thiab xav tau kom ua tiav cov txiaj ntsig zoo tshaj plaws.
Post lub sij hawm: Aug-21-2024