Hydroxyethylcellulose (HEC) yog ib yam khoom siv ua kom tuab thiab siv tau zoo uas siv dav hauv ntau yam lag luam. Cov tshuaj no yog los ntawm cellulose, ib yam polymer ntuj uas pom muaj ntau hauv cov phab ntsa cell ntawm cov nroj tsuag. HEC cov yam ntxwv tshwj xeeb ua rau nws zoo tagnrho rau kev ua kom tuab ntawm ntau yam khoom, los ntawm cov khoom siv tu tus kheej mus rau cov qauv kev lag luam.
Txheej txheem cej luam ntawm Cellulose
Cellulose yog ib hom carbohydrate uas muaj cov saw hlau ntawm cov glucose molecules txuas nrog β-1,4-glycosidic bonds. Nws yog cov khoom tseem ceeb ntawm cov phab ntsa ntawm cov nroj tsuag, muab kev ruaj khov thiab lub zog rau cov nroj tsuag cov hlwb. Txawm li cas los xij, nws cov qauv ib txwm tsis yaj thiab muaj kev ua haujlwm tsawg rau qee qhov kev siv.
cov khoom siv cellulose
Yuav kom txhim kho qhov ua haujlwm ntawm cellulose, ntau yam derivatives tau raug synthesized los ntawm kev hloov nws cov qauv. Ib qho derivative yog hydroxyethyl cellulose (HEC), uas hydroxyethyl pawg tau nkag mus rau hauv cellulose backbone. Qhov kev hloov kho no muab HEC cov khoom tshwj xeeb, ua rau nws soluble hauv dej thiab zoo heev ua ib qho thickener.
Cov yam ntxwv ntawm HEC
Kev yaj tau
Ib qho ntawm cov yam ntxwv tseem ceeb ntawm HEC yog nws cov dej solubility. Tsis zoo li cov cellulose ntuj, HEC yaj tau yooj yim hauv dej, tsim cov tshuaj meej. Qhov solubility no ua rau nws yooj yim rau kev koom ua ke rau hauv ntau yam formulations.
Cov khoom rheological
HEC ua rau pom kev pseudoplastic lossis shear-thinning tus cwj pwm, txhais tau tias nws cov viscosity txo qis hauv qab shear kev ntxhov siab thiab nce ntxiv tom qab kev ntxhov siab tau txo qis. Qhov rheology no tseem ceeb rau cov ntawv thov uas xav tau yooj yim ntawm kev nthuav dav lossis nchuav, xws li kev tsim cov xim, cov nplaum thiab cov khoom siv tu tus kheej.
Kev ruaj khov ntawm pH
HEC ruaj khov rau ntau yam pH, ua rau nws siv tau rau hauv cov kua qaub, nruab nrab thiab alkaline. Qhov kev hloov pauv no tau pab txhawb rau nws txoj kev siv dav hauv ntau yam lag luam xws li tshuaj pleev ib ce, tshuaj thiab khoom noj.
Cov ntawv thov ntawm HEC
cov khoom siv saib xyuas tus kheej
Tshuaj zawv plaub hau thiab tshuaj pleev plaub hau: HEC feem ntau siv los ua kom cov khoom siv tu plaub hau tuab, muab cov viscosity zoo tagnrho thiab txhim kho cov qauv tag nrho.
Cov Tshuaj Pleev thiab Tshuaj Lotions: Hauv cov qauv tshuaj pleev tawv nqaij, HEC pab ua tiav qhov sib xws xav tau thiab ua rau muaj kev sib kis ntawm cov tshuaj pleev thiab tshuaj pleev.
Tshuaj Txhuam Hniav: Nws tus cwj pwm pseudoplastic pab txhawb cov tshuaj txhuam hniav uas tso cai rau kev faib tawm yooj yim thiab nthuav dav thaum txhuam hniav.
Xim thiab Cov Tshuaj Pleev Xim
Xim pleev xim latex: HEC pab ua kom cov xim pleev xim latex viscosity thiab ruaj khov, ua kom ntseeg tau tias daim ntawv thov thoob plaws qhov chaw.
Cov nplaum: Hauv cov qauv nplaum, HEC pab tswj cov viscosity thiab txhim kho cov khoom sib txuas.
tshuaj
Kev Ncua Qhov Ncauj: HEC yog siv los ua kom cov tshuaj ncua qhov ncauj tuab dua los muab daim ntawv ruaj khov thiab qab rau cov tshuaj.
Cov tshuaj pleev rau sab nraud: Qhov solubility ntawm HEC hauv dej ua rau nws tsim nyog rau kev tsim cov tshuaj pleev rau sab nraud, kom yooj yim rau kev siv thiab nqus tau.
kev lag luam zaub mov
Cov kua ntses thiab cov khaub ncaws hnav: HEC yog siv los ua kom cov kua ntses thiab cov khaub ncaws tuab, txhim kho lawv cov qauv thiab qhov ncauj.
Cov Khoom Ci: Hauv qee cov zaub mov ci, HEC pab ua kom cov batters thiab khob cij tuab.
Kev tsim khoom thiab kev tswj xyuas zoo
kev sib xyaw ua ke
HEC feem ntau yog tsim los ntawm kev sib xyaw ntawm cellulose nrog ethylene oxide nyob rau hauv cov xwm txheej tswj hwm. Qhov degree ntawm kev hloov pauv (DS) ntawm hydroxyethyl pawg tuaj yeem hloov kho thaum lub sijhawm ua ke, yog li cuam tshuam rau qhov kev ua tau zoo kawg ntawm HEC.
QC
Cov kev ntsuas tswj xyuas zoo yog qhov tseem ceeb heev kom ntseeg tau tias HEC ua tau zoo tas li hauv ntau yam kev siv. Cov kev ntsuas xws li qhov hnyav molecular, qib kev hloov pauv thiab kev huv huv raug saib xyuas zoo thaum lub sijhawm tsim khoom.
kev xav txog ib puag ncig
Ib yam li cov tshuaj lom neeg sib xyaw, cov yam ntxwv ib puag ncig yog qhov tseem ceeb. HEC yog los ntawm cellulose thiab yog biodegradable ntau dua li qee cov khoom siv thickeners. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum xav txog qhov cuam tshuam ib puag ncig ntawm nws cov khoom tsim thiab siv rau hauv ntau daim ntawv thov sib txawv.
xaus lus
Hauv kev xaus lus, hydroxyethylcellulose (HEC) sawv tawm ua ib qho thickener zoo thiab ntau yam nrog kev siv thoob plaws ntau yam lag luam. Nws cov khoom tshwj xeeb, suav nrog dej solubility, rheological tus cwj pwm thiab pH stability, ua rau nws yog ib qho khoom xyaw muaj txiaj ntsig hauv ntau yam khoom tsim. Raws li kev lag luam txuas ntxiv nrhiav lwm txoj hauv kev zoo rau ib puag ncig, HEC cov khoom biodegradable los ntawm cov nroj tsuag cellulose ua rau nws yog ib qho kev xaiv ruaj khov rau ntau yam kev siv. Kev tshawb fawb txuas ntxiv thiab kev tsim kho tshiab hauv cellulose derivatives xws li HEC yuav ua rau muaj kev nce qib ntxiv, muab kev ua tau zoo dua thiab txo qis kev cuam tshuam rau ib puag ncig.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-02-2023