Cellulose ether, tshwj xeeb tshaj yog hydroxypropyl metrcellulose ether (HPMC) yog qhov tseem ceeb hauv kev sib sau ua lag luam. Rau cellulose ether, nws lub viscosity yog qhov taw qhia tseem ceeb uas tau siv volcosity tau yuav luag los ua kev lag luam cug. Rau cellulic cellulose etherers cov tshuab, vim hais tias muaj kev cuam tshuam ntawm lawv cov thev naus laus zis, nws yog qhov nyuaj rau kev lees paub lub cellulose siab ether khoom rau lub sijhawm ntev.
Txij li thaum kev ua haujlwm hauv tsev ether nkag mus rau txoj kev txhaj tshuaj ether, tshwj xeeb tshaj yog hydroxypropyl cellulose ether (HPMC), tau dhau los ua qhov teeb meem tsis muaj kev zam tau. Ntawm ib sab tes, txij thaum pib cellule cellulose kev lag luam, tsis tuaj yeem sib tw nrog kev nkag siab cov ntaub ntawv nkag siab, cov khoom lag luam ruaj khov, thiab cov khoom lag luam ntxiv. Sib nrug los ntawm tus nqi, tsuas yog qhov chaw ci ci uas tuaj yeem tshaj tawm yog qhov viscosity siab; Ntawm qhov tod tes, cov cellulose cellulose feem ntau siv lub paj rwb ua kom zoo yog cov khoom raw. Piv nrog cov khoom txawv teb chaws uas siv ntoo pulp li cov khoom siv raw, nws yooj yim kom ua tiav cov viscosity siab. Txawm hais tias los ntawm cov kev pom ntawm cug tshuab tshuab, tab sis lub tswv yim zoo ether cov cellulor tau tawm ntawm lub tshuab nqus dej ntawm cov tshuaj ntxuav cov hmoov kom qhuav. Hloov. Lub viscosity ntawm cellulose ntawm cellulose tau dhau los ua tus tshuaj khib nyiab uas muab tshuaj khib nyiab uas them sai sai tau los ua cov kev xav tau ntawm kev ua haujlwm hauv tsev lag luam. Txawm li cas los xij, vim muaj qhov tsis muaj peev xwm hauv cov khoom siv tsim khoom, cov cuab yeej txaus, nws yog qhov nyuaj rau cov khoom siv hauv tsev muaj ntau yam tsuas yog xav tau cov khoom lag luam uas siab tshaj. Nyob rau hauv qhov xwm txheej tam sim no, cellulose ether cov khoom ua tau txhua yam ua tau kom nce viscosity ntawm kev ua kom zoo nkauj "lossis" viscosity enhancer "los ua neeg. "Viscosity enhancer" lossis "viscosity enhancer" yog qhov tseeb ib tug neeg sawv cev hla. Hauv txoj ntsiab cai, cov qauv txheej txheem ntawm cellulose ether yog hla cov khoom sib txuas hauv lub cellulose ethoour aqueion daws. Raws li qhov tshwm sim, lub cellulose ethous cov tshuaj pom muaj viscosity siab thaum kuaj, tab sis nws yog tiag tiag pseudo-viscosity.
Cellulose ether yog siv nyob rau hauv coll cov khoom lag luam ua cov neeg sawv cev dej, cov khoom siv ntub dej, thiab muaj lub sijhawm ua haujlwm thiab hom kev tsim kho ntawm lub tshuab cug. Cov haujlwm no tsuas yog ua tiav los ntawm kev tsim cov hydrogen khi ntawm cov cellule ether molecules thiab cov dej molecules thiab cov khoom siv dej ntawm cellules ither molecules. Qhov kev sib txuas ntawm viscosity-txhim kho ib feem ntawm hydrogen khi ntawm cellulement thiab cov dej tsis muaj zog thiab ntub dej ntawm cellulose ether tsis muaj zog. Feem ntau ntawm cov cug tuam txhab tsim tsis xav tias qhov no. Ntawm ib sab tes, cov khoom siv tshuaj cug yog cov ntxhib thiab tseem tsis tau mus txog theem ntawm kev them nyiaj ze rau cov kev ua haujlwm. Ntawm qhov tod tes, lub viscosity peb xaiv yog ntau dua li cov thev naus laus zis uas yuav tsum muaj peev xwm ua kom muaj peev xwm ua rau muaj peev xwm ua tau zoo.
Lub cellulose ether muaj viscosifier hauv cov txheej txheem ntau lawm tau cuam tshuam rau kev ua yeeb yam zaum kawg. Daim ntawv no tau txheeb xyuas daim ntawv thov ntawm cellulose cov khoom hauv cov txheej txheem ib txwm muaj thiab cellulose khoom siv nrog cov txheej txheem viscosifiers nyob rau cov vuas ntau lawm Hauv cov kua nplaum, qhov sib txawv hauv lub zog tensile adhesive zog tom qab kho tau nyob rau hauv cov xwm txheej sib txawv.
Lub sij hawm ncua: Mar-07-2023