Hydroxyethyl cellulose (HEC) yog tsis-ionic, dej-soluble polymer muab tau los ntawm cellulose. Nws yog dav siv nyob rau hauv ntau yam kev lag luam, suav nrog cov nplaum, qhov twg nws ua rau cov neeg sawv cev ua kom tuab, rheology kho tshuab, thiab stabilizer. HEC muaj peev xwm txhim kho lub viscosity ntawm cov nplaum yog qhov tseem ceeb rau ntau daim ntawv thov, kom ua tau zoo, kev ua tau zoo, thiab kev ua haujlwm ntev ntawm cov khoom nplaum.
Cov khoom ntawm hydroxyethyl cellulose
HEC yog tsim los ntawm kev rov ua haujlwm cellulose nrog ethylene oxide nyob rau hauv Alkaline tej yam kev mob, uas ua rau hydroxyethyl pab pawg txuas rau lub cellulose caj qaum. Cov degree ntawm kev hloov pauv (DS) thiab cov hniav puas hloov (MS) yog qhov tseem ceeb uas cuam tshuam cov yam ntxwv ntawm HEC. Cov DS hais txog qhov nruab nrab ntawm cov pab pawg hydroxyl ntawm cov pab pawg ntawm cov neeg ethylene oxes uas tau ua rau muaj kev cuam tshuam nrog ib tus ntawm cov neeg ethylene oxes
HEC yog tus cwj pwm los ntawm nws solubility hauv dej, sib sau ua kom meej thiab pob tshab nrog cov viscosity siab. Nws cov viscosity yog pawg los ntawm ntau yam, suav nrog txoj haujlwm hnyav, kev xav, kub thiab cov ph ntawm kev daws teeb meem. Qhov hnyav molecular ntawm Hec muaj peev xwm los ntawm qhov tsawg rau siab heev, tso cai rau cov qauv tsim ntawm cov nplaum uas muaj varying viscosity xav tau.
Cov tswv yim ntawm viscosity li
Cock thiab o:
HEC Muab cov nplaum nplaum nplaum viscirecosity feem ntau los ntawm nws lub peev xwm rau hydrate thiab o hauv dej. Thaum Hec yog ntxiv rau ib pab ntoo tom aqueous, cov pab pawg hydrox nyiam cov roj av, ua rau qhov o ntawm polymer ntawm cov saw hlau polymer. Qhov o ua rau cov kev daws teeb meem tiv thaiv ntws, yog li nce nws viscosity. Qhov ntev ntawm o thiab lub resulting viscosity muaj txiaj ntsig los ntawm cov polymer concentration thiab txoj kev molecular hnyav ntawm HEC.
Molecular entanglement:
Hauv kev daws, HEC polymer yauv mus vim lawv cov qauv ntev. Qhov kev nkag siab no tsim lub network uas cuam tshuam txoj kev txav ntawm cov lwg me me hauv cov nplaum, yog li nce viscosity. Cov tshuaj hnyav siab dua Hec cov tshuaj nyob rau hauv ntau qhov tseem ceeb thiab siab dua viscosity. Qib ntawm kev ua tau zoo tuaj yeem tswj los ntawm kev hloov kho lub polymer thiab txoj kev ua molecular ntawm HEC siv.
Hydrogen Bonding:
HEC tuaj yeem tsim cov hlua khau thiab cov dej lwg me me thiab lwm yam hauv cov qauv nplaum. Cov hydrogen bonds pab txhawb rau lub viscosity los ntawm kev tsim cov kev tsim qauv ntau hauv kev daws teeb meem. Cov pab pawg hydroxyethyl ntawm lub cellulose cellulose lub peev xwm los tsim cov ntawv hydrogen hydrogen, ntxiv mus ntxiv rau hauv viscosity.
Shear-thev phem:
HC cov khoom ua pov thawj shear-thij tus cwj pwm, lub ntsiab lus nws viscosity txo qis nyob rau hauv shear kev ntxhov siab. Cov cuab yeej no yog qhov zoo hauv daim ntawv thov nplaum vim tias nws tso cai rau kev yooj yim los yog txhuam hniav) thaum tswj cov khoom muaj txiaj ntsig siab thiab ruaj khov. Tus cwj pwm shear-thec yog ntaus nqi rau cov txheej txheem ntawm polymer chains hauv cov kev taw qhia, txo cov kev tiv thaiv sab hauv ib ntus.
Cov ntawv thov hauv cov qauv nplaum
Dej-based nplaum:
Hec yog qhov dav dav hauv cov nplaum uas muaj cov nplaum, xws li cov ntawv, textiles, thiab ntoo. Nws lub peev xwm los thicken thiab ruaj khov cov nplaum tsim kom muaj kev ntseeg tau tias nws tseem nyob nrog kev sib xyaw thiab yooj yim thov. Hauv ntawv thiab ntim cov nplaum, HEC muab cov viscosity tsim nyog rau kev siv tau zoo thiab lub zog ua kom muaj zog.
Siv cov nplaum:
Hauv kev tsim cov nplaum, xws li cov neeg siv rau cov nplais teeb lossis phab ntsa npog, hec txhim kho lub piscesive, txhim kho cov nplaum ua haujlwm thiab sag tsis kam. Qhov ua tuab ntawm HEC kom ntseeg tau tias cov nplaum uas nyob hauv qhov chaw thaum ntawv thov thiab teeb tsa kom zoo, muab nyiaj txhiv kom ruaj khov thiab ruaj khov.
Kev kom zoo nkauj thiab kev saib xyuas tus kheej:
HEC kuj tseem siv rau hauv cov tshuaj pleev ib ce thiab cov khoom saib xyuas tus kheej uas yuav tsum muaj cov khoom nplaum zoo, xws li hauv cov plaub hau styling gels thiab ntsej muag lub ntsej muag. Hauv cov ntawv thov no, HEC muab txoj kev du thiab sib txawv, txhim kho cov khoom lag luam thiab cov neeg siv kev paub.
Kws Tshuaj Txhuam Khoom Noj:
Hauv kev lag luam kws tshuaj, hec yog siv hauv kev hloov pauv thaj thiab lwm cov kev xa tshuaj uas tswj viscial rau cov nplaum rau cov nplaum. HEC kom ntseeg tau tias cov txheej txheem nplaum yog cov khaub ncaws nplaum zoo nkauj, muab kev xa khoom siv tshuaj ib yam thiab muaj kev yoog raws rau daim tawv nqaij.
Yam cuam tshuam rau viscosity li
Concentration:
Cov concentration ntawm HEC hauv kev tsim qauv nplaum yog ncaj qha rau lub viscosity. Kev txiav txim siab dua ntawm Hec qhov tshwm sim hauv cov viscosity ntau ntxiv vim muaj ntau cov kev sib txuas lus polymer polymer thiab entanglements. Txawm li cas los xij, kev ntau dhau siab tuaj yeem ua rau gelation thiab kev nyuaj ua kev ua.
Molecular hnyav:
Qhov hnyav molecular ntawm HEC yog qhov tseem ceeb tshaj plaws hauv kev txiav txim siab lub viscosity ntawm cov nplaum. Ntau dua molecular hnyav Hec muab cov viscosity ntau dua ntawm cov qis dua piv rau cov variant tsawg dua molecular hnyav variants. Qhov kev xaiv ntawm cov roj molecular yog nyob ntawm qhov xav tau viscosity thiab kev tseev kom muaj.
Kub:
Qhov kub thiab txias cuam tshuam txog kev tawm tsam ntawm HEC. Raws li kub nce ntxiv, lub viscosity feem kev txo qis vim muaj kev txo qis hauv hydrogen bonding thiab nce molecular muaj kev mus ncig. Nkag siab txog qhov ntsuas kub-viscosity kev sib raug zoo yog qhov tseem ceeb rau kev siv tau los sib txawv.
Ph:
Cov PH ntawm cov nplaum tsim muaj peev xwm cuam tshuam lub viscosity ntawm HEC. HEC yog nyob ruaj khov ntau ntau, tab sis ntau hom yuav tuaj yeem ua rau kev hloov pauv ntawm cov qauv polymer thiab viscosity. Tsim cov nplaum nyob rau hauv qhov kev coj zoo tshaj plaws ntev ua kom muaj kev ua tau zoo sib xws.
Qhov zoo ntawm kev siv hydroxyethyl cellulose
Cov xwm tsis-ionic:
Cov kev tsis-ionic ntawm HEC ua rau nws tau tshaj nrog ntau yam ntawm lwm cov txheej txheem, suav nrog lwm cov polymers, surfactants, thiab elecolytes. Qhov kev sib xyaw no pub rau ntau yam qauv nplaum nplaum nplaum.
Biodegradability:
HEC tau muab los ntawm cellulose, lub ntuj thiab txuas ntxiv dua. Nws yog biodegradable, ua rau nws ib puag ncig tus phooj ywg xaiv rau cov qauv nplaum. Nws siv ua ke nrog kev cog qoob loo rau kev ua kom ruaj khov thiab cov khoom lag luam hauv eco.
Stability:
HEC muab kev ruaj khov zoo tshaj plaws rau cov qauv nplaum ua kom zoo nkauj, tiv thaiv theem sib cais thiab kev teeb tsa ntawm cov khoom siv khov kho. Qhov kev ruaj khov no ua kom muaj cov nplaum ua tau zoo thoob plaws nws lub txee lub neej thiab lub sijhawm ntawv thov.
Zaj duab xis-ua cov khoom:
HEC siv yoog raws thiab pob tshab cov yeeb yaj kiab thaum ziab, uas tau txais txiaj ntsig zoo rau cov ntawv nplaum nplaum thiab yoog raws. Cov cuab yeej no yog pab tau tshwj xeeb rau cov ntawv thov xws li cov ntawv lo thiab tapes.
Hydroxyethyl cellulose plays lub luag haujlwm tseem ceeb hauv kev txhim kho lub viscisation ntawm kev ua dej tsaws tsag xws li kev ua kom hydration, hydrogen kev coj ua, thiab shear-thij-thij-thij-thij-thij-thij-thij-thuav. Nws cov khoom, suav nrog solubility, tsis-ionic Xwm, biodegradability, thiab zaj duab xis tsim muaj peev xwm, ua rau nws xaiv zoo tshaj plaws rau ntau yam nplaum nplaum. Nkag siab txog qhov uas cuam tshuam HEC's Viscosity ua kom tiav, qhov hnyav, thiab PH, Raws li kev lag luam txuas ntxiv mus nrhiav cov ntaub ntawv nyob ruaj khov thiab ua haujlwm siab, HEC tseem muaj txiaj ntsig zoo hauv kev tsim cov khoom nplaum ntawm cov khoom nplaum ntawm cov khoom lag luam qib siab.
Lub Sijhawm Post: Lub Tsib Hlis-29-2024