Ultra-siab viscosity hydrotyl cellulose (HEC) yog dej-soluble polymer compeded tsim los ntawm etherification ntawm cellulose. Vim yog nws cov lus pom zoo zoo kawg, HEC tau dav siv hauv ntau cov teb xws li tshuaj pleev ib ce, tshuaj, kev tsim kho thiab roj tawm.
(1), HEC qauv thiab kev npaj npaj
1.1 qauv
HEC yog ether derivative tau los ntawm kev kho tshuaj lom neeg ntawm ntuj cellulose. Nws cov txheej txheem theem pib yog β-d-flucose, txuas nrog β-1,4 glycosidic bonds. Cov pab pawg hydroxyl (-h) hauv cellulose yog hloov los ntawm ethylene oxide (EO) lossis lwm tus neeg sawv cev, yog qhia ib pawg neeg sawv cev hydroxyethyl cellulose. Ultra-siab viscosity HEC muaj qhov hnyav dua molecular hnyav, feem ntau ntawm ntau lab, uas tso cai rau nws kom nthuav tawm cov viscosity siab heev hauv dej.
1.2 txoj kev npaj npaj
Kev npaj ntawm HEC feem ntau muab faib ua ob kauj ruam: pretreatment ntawm cellulose thiab herherification tiv thaiv.
Pretreatment ntawm cellulose: xws li paj rwb, ntoo pulp, thiab lwm yam) yog kho cov saw hlau molecular rau tom ntej.
ETherification tiv thaiv: Hauv qab kev mob ntawm lub cellulose yog siv nrog ethylene oxide lossis lwm tus neeg sawv cev los qhia cov pab pawg hydroxyethyl pawg. Cov txheej txheem tshuaj tiv thaiv tau cuam tshuam los ntawm cov yam ntxwv xws li kub, sijhawm, thiab HEC nrog cov kev hloov pauv sib txawv (cov kab mob tsis sib xws (MS) thaum kawg tau txais. Ultra-siab viscosity Hec feem ntau yuav tsum muaj kev haum siab heev thiab qhov kev tsim nyog ntawm kev hloov pauv hauv dej.
(2) tus yam ntxwv ntawm HEC
2.1 solubility
Hec Dissolves hauv ob qho dej txias thiab dej kub, ua cov pob tshab lossis cov tshuaj pleev pob tshab. Qhov kev cais tawm tau cuam tshuam los ntawm cov yam ntxwv xws li kev hnyav molecular, qib siab hloov chaw, thiab ntsuas kub. Ultra-siab viscosity HEC muaj cov solubility uas tsis muaj sia nyob hauv dej thiab yuav tsum muaj lub caij nyoog tshem kom yaj.
2.2 Viscosity
Lub viscosity ntawm ultra-siab viscosity HEC yog nws cov yam ntxwv zoo tshaj plaws. Nws viscosity feem ntau nyob ntawm ob peb txhiab mus rau ntau txhiab tus neeg Millipuma, nyob ntawm qhov siab, thiab kub, thiab shear tus nqi ntawm kev daws. Lub viscosity ntawm HEC tsis tsuas yog nyob ntawm cov molecular hnyav, tab sis kuj tseem muaj feem cuam tshuam nrog cov qib ntawm cov qauv molecular.
2.3 ruaj khov
HEC muaj qhov ruaj khov zoo hauv cov acids, alkalis thiab feem ntau cov kuab tshuaj organic thiab tsis yooj yim degraded. Tsis tas li ntawd, HEC muaj kev daws teeb meem zoo muaj zog ruaj khov thiab tuaj yeem tswj lawv viscosity thiab lwm yam ntawm lub cev thiab tshuaj lom neeg tau ntev.
2.4 kev sib raug
Hec yog sib haum nrog ntau yam tshuaj, nrog rau surfactants, ntsev thiab lwm cov dej-soluble polymers. Nws cov kev sib xyaw zoo ua rau nws tswj tau ruaj khov ua tau zoo hauv cov qauv kev ua yeeb yam.
(3) daim ntawv thov ntawm HEC
3.1 Tshuaj pleev ib ce thiab cov khoom siv saib xyuas tus kheej
Hauv cov tshuaj pleev ib ce, HEC tau dav siv los ua tuab, stabilizer thiab zaj duab xis-ua tus neeg sawv cev. Ultra-siab viscosity HEC tuaj yeem muab kev kov tau zoo heev thiab ntev ntev thiab siv cov tshuaj pleev li ntawd, tshuaj ntxhua khaub ncaws, thiab txias.
3.2 Kev lag luam kws tshuaj
Raws li cov khoom siv tshuaj tiv thaiv, HEC feem ntau siv nyob rau hauv kev npaj ntawm cov ntsiav tshuaj-tso cov ntsiav tshuaj, cov kua pleev thiab lwm yam kev npaj tshuaj. Nws cov hom phiaj viscosity siab tuaj yeem tswj cov tshuaj tso tawm yeeb tshuaj thiab txhim kho cov xyoob ntawm cov tshuaj.
3.3 Cov Ntaub Ntawv Hauv Tsev
Hauv kev tsim kho kev tsim kho, HEC yog siv los ua cov tuab thiab dej-khaws cov neeg sawv cev rau cov khoom noj thiab cov khoom siv gypsum. Nws cov viscosity siab thiab cov dej zoo pab txhim kho kev ua tau zoo thiab tiv thaiv cov khoom siv tawm thiab sagging.
3.4 Cov roj Extraction
Nyob rau hauv kev lag luam roj av, HEC yog siv hauv cov kua dej drilling thiab fracturing kua los ua cov tuab tuab thiab luag reducer thiab luag reducer. Cov neeg viscosity hec ultra siab tuaj yeem txhim kho kev ncua kev ncua muaj peev xwm thiab cov xuab zeb muaj peev xwm ntawm cov dej thiab cov dej khov.
(4) kev txhim kho cov kev cia siab ntawm HEC
Nrog kev nce qib ntawm thev naus laus zis thiab hloov hauv kev ua lag luam xav tau, daim ntawv thov tau txais ntawm HEC tseem txuas ntxiv kom nthuav dav. Cov lus qhia txog yav tom ntej muaj xws li:
4.1 Kev loj hlob ntawm cov kev ua haujlwm siab HEC
Los ntawm kev txhim kho cov txheej txheem ntau lawm thiab cov khoom siv raw raw, hac nrog cov khoom viscility ntau dua, ua tau zoo dua qub thiab ruaj khov tuaj yeem ua kom tau txais txiaj ntsig zoo dua.
4.2 Kev tiv thaiv ib puag ncig thiab kev txhim kho kom ruaj khov
Tsim cov txheej txheem zoo ib puag ncig thiab cov khoom siv raw, txo kev siv zog thiab cov khib nyiab pov tseg thaum lub sijhawm tsim khoom, thiab txhim kho kev ruaj khov ntawm Hec.
4.3 Kev nthuav dav ntawm cov ntawv thov tshiab
Tshawb cov ntawv thov ntawm HEC hauv cov ntaub ntawv ntawm cov ntaub ntawv tshiab, kev lag luam khoom noj thiab kev lag luam ib puag ncig los txhawb nws cov ntawv thov hauv ntau yam kev lag luam.
Ultra-siab viscosity HEC yog cov khoom siv polymer ntau polymer nrog cov kev thov dav ua ntej. Nws tshwj xeeb cov hom phiaj viscosity thiab tshuaj zoo ruaj khov ua kom nws ua lub luag haujlwm tseem ceeb hauv kev lag luam ntau yam. Nrog kev nce qib ntawm thev naus laus zis thiab kev nthuav dav ntawm daim ntawv thov teb, kev lag luam kev cia siab ntawm HEC yuav yog dav dav.
Lub Sijhawm Post: Feb-17-2025