Hydroxyethyl cellulose (HEC) yog qhov tseeb lub polymer. Txhawm rau kom nkag siab txog qhov no, peb yuav tsum tshawb xyuas cov ntsiab lus tseem ceeb ntawm cov polymers, cov qauv ntawm cov khoom siv ntawm hydroxyethyl cellulose, thiab nws cov ntawv thov.
1. Cov ntsiab lus yooj yim ntawm polymers
Cov neeg polymers yog macromolecular tebchaw tsim los ntawm ntau tus lej rov qab ua (hu ua monomers) txuas nrog los ntawm cov neeg sib txuas lus. Cov monomers ua cov qauv ntev ntev los ntawm polymnerization kev tiv thaiv, muab cov polymers tshwj xeeb lub cev thiab tshuaj lom neeg. Raws li lawv cov peev txheej, polymers tuaj yeem faib ua cov polymers thiab hluavtaws polymers. Ntuj txiag polymers suav nrog cellulose, protein, thiab cov roj hmab ntuj; Cov hluavtaws polymers suav nrog polyethylene, polystyrene, thiab polyvinyl chloride.
2. Cellulose thiab nws cov qauv
Cellulose yog cov muaj ntau tshaj organic polymer compound nyob rau hauv qhov, feem ntau pom hauv tsob nroj cell phab ntsa. Cellulose yog polysaccharide muaj cov β-flucose units linearly sib txuas los ntawm β (1 → 4) grystallinity thiab ruaj khov qauv. Vim nws cov chav ua si qab zib ua dua, cellulose nws tus kheej yog lub ntuj polymer.
3. Khoom cua thiab cov qauv ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose yog ib qho tseem ceeb ntawm kev qhia txog hydroxyethyl (-ch₂chtoh) rau hauv lub cellulose molecular. Tshwj xeeb, cellulose reacts nrog ethyl chlorooacetate lossis ethyl chloroacetate tov nyob rau hauv Alkaline cov kev mob los tsim hydroxyethyl cellulose.
Kev tsim qauv, hydroxyethyl cellulose tseem khaws cov qauv ntawm cellulose, uas yog, ib qho kev sib tw saw loj uas tau ua ntau cov roj hallucose. Txawm li cas los xij, qee cov pab pawg hydroxyl tau hloov los ntawm hydroxyethyl pab pawg, thiab cov cellivity ua solubility muaj solubility muaj solubility muaj solubility muaj solubility muaj solubility muaj solubility los ntawm cov ntawm cov thawj cellulose. Txawm hais tias cov lus qhia ntawm cov qauv cellulose tseem ceeb heev, thiab nws cov qauv molecular muaj cov khoom siv ua dua, yog li nws ntsib cov lus txhais ntawm cov polymer.
4. Cov yam ntxwv ntawm hydroxyethyl cellulose
Raws li cov polymer, hydroxyethyl cellulose muaj qee cov khoom siv polymer muaj raws li nram no:
High molecular hnyav: qhov hnyav molecular ntawm hydroxyethyl cellulose feem ntau yog nyob ntawm ntau pua txhiab tus neeg daltifi, qhia pom cov yam ntxwv zoo li polymer.
Cov kev daws teeb meem: Hydroxyethyl cellulose tuaj yeem tsim cov tshuaj colloidal hauv ob qho tib si txias thiab dej kub. Lub viscosity ntawm nws cov kev daws teeb meem yog cuam tshuam nrog cov kev hnyav molecular thiab qib hloov chaw. Cov cuab yeej no yog qhov tseem ceeb tseem ceeb hauv ntau cov ntawv thov.
Thermosensitivity: Lub viscosity ntawm hydroxyethyl cellulose kev hloov pauv nrog qhov kub thiab txias, uas yog ib qho cuab yeej ntawm polymer.
Thickening thiab ua yeeb yaj kiab-tsim muaj peev xwm: Vim tias qhov kev sib tw thiab kev sib cuam tshuam ntawm cov qauv ntawm lub cev, muab nws cov duab ua kom ruaj khov rau hauv kev daws teeb meem.
V. Daim Ntawv Thov ntawm Hydroxyethyl Cellulose
Vim tias nws cov cim hluav taws xob tshwj xeeb, hydroxyethyl cellulose yog dav siv nyob rau hauv ntau thaj teb. Cov hauv qab no yog qee cov ntawv teev npe:
Cov ntaub ntawv hauv tsev: Ua cov cement ntxiv, hydroxyethyl cellulose tuaj yeem txhim kho cov kua dej thiab dej tuav tseg thiab txhim kho kev ua haujlwm zoo.
Cov xim pleev xim rau cov xim tha xim: hauv cov txheej txheej, HEC yog siv los ua cov tuab, stabilizer thiab zaj duab xis thiab zaj duab xis ua tus neeg sawv cev los txhim kho cov nplaum thiab smoothness ntawm txheej.
Cov nplaum: Nws cov khoom sib raug zoo ua rau nws yog qhov tseem ceeb ntawm cov qauv nplaum.
Kev lag luam HEC tau siv rau hauv cov ntawv txheej thiab ua los txhim kho saum npoo du thiab luam ntawv cov khoom ntawm daim ntawv.
Cov tshuaj pleev ib ce: HEC tau dav siv nyob rau hauv cov tshuaj pleev, cov tshuaj txhuam hniav thiab cov khoom siv saib xyuas tawv nqaij.
Cov ntawv thov no siv tau cov hom phiaj ntawm cov polymer ntawm hydroxyethyl cellulose thiab ua yeeb yam siab, ntxiv qhia nws cov haujlwm thiab qhov tseem ceeb ua cov polymer.
Hydroxyethyl cellulose yog cov polymer tau txais los ntawm kev hloov tshuaj lom neeg ntawm cellulose. Nws cov qauv molecular muaj ntau ntawm cov chav dej uas pheej dua, uas tseem tuav cov yam ntxwv siab thiab txoj saw hlau tom qab hydroxyethyl hloov. Hydroxyethyl kev nthuav qhia ib txwm polymer cov khoom xws li cov tshuaj viscosity siab, daws cov kev sib xyaw ua yeeb yaj kiab, thiab yog siv tau muaj peev xwm, thiab yog siv tau muaj peev xwm, thiab yog siv ntau lub peev xwm hauv ntau daim teb. Yog li, nws tuaj yeem qhia meej tias hydroxyethyl cellulose yog qhov tseem ceeb polymer.
Lub Sijhawm Post: Feb-17-2025