Cellulose ether (CE) yog chav kawm ntawm derivatives tau los ntawm cov cellically hloov cellulose. Cellulose yog lub tseem ceeb tivthaiv ntawm cov nroj tsuag ntawm tes, thiab cov cellulose muaj cov neeg muaj kev txhawb nqa los ntawm ethermal pawg (-oh) hauv cellulose. Lawv tau siv dav hauv ntau daim teb xws li cov ntaub ntawv hauv tsev, tshuaj, zaub mov, tshuaj pleev ib ce, thiab siv dav hauv ntau yam kev lag luam vim lawv cov tshuaj thiab cov tshuaj lom neeg thiab cov tshuaj lom neeg.
1. Kev faib tawm ntawm Cellulose muaj cov neeg muaj cai
Cov neeg hais txog cellulose tuaj yeem muab faib ua ntau hom raws li cov kev hloov chaw ntawm cov qauv tshuaj. Feem ntau cov kev faib tawm feem ntau yog ua raws qhov sib txawv hauv kev hloov chaw. Cov cellulose cov neeg muaj kev pab muaj raws li hauv qab no:
Methyl Cellulose (MC)
Methyl cellulose yog tsim los ntawm hloov lub hydroxyl ib feem ntawm cov cellulose molecule nrog methyl (-ch₃). Nws muaj cov khoom siv ua kom zoo, ua yeeb yaj kiab ua yeeb yaj kiab thiab siv tau hauv cov ntaub ntawv tsim tsev, tsho loj, tshuaj thiab kev lag luam.
HydroxyPropyyl Methylcellulose (HPMC)
HydroxyPropyyl Metylcellulose yog ib qho khoom siv ntawm tes ether, uas tau siv siv tshuaj lom neeg thiab khoom noj khoom haus txhua hnub thiab tshuaj lom neeg ruaj khov. HPMC yog cov neeg nonionic cellulose ether nrog cov khoom ntawm dej khaws cia, thickening thiab ruaj khov.
Carboxymethyl cellulose (cmc)
Carboxymethyl cellulose yog anionic cellulose etionic generated los ntawm kev qhia Carboxymethyl (-ch₂Cooh) pab pawg ua ke rau hauv molecules molecules. CMC muaj cov dej solubility zoo heev thiab feem ntau yog siv los ua cov tuab, stabilizer thiab ncua tus neeg sawv cev. Nws yog lub luag haujlwm tseem ceeb hauv cov zaub mov, tshuaj thiab cov tshuaj pleev ib ce.
Ethyl Cellulose (EC)
Cov xov xwm Ethyl yog tau los ntawm hloov cov pab pawg hydroxyl hauv cellulose nrog Ethyl (-ch₂ch₃). Nws muaj zoo hydrophobicity thiab feem ntau siv los ua zaj duab xis txheej tus neeg sawv cev thiab tswj cov khoom tso tawm hauv kev lag luam tshuaj.
2. Lub cev thiab tshuaj lom neeg ntawm cov kws hais txog cellulose
Lub cev nqaij daim tawv thiab tshuaj lom neeg ntawm cov kws hais ua haujlwm cellulose yog qhov zoo xws li hom cellulose ether, hom kev hloov chaw thiab qib hloov chaw. Nws cov khoom tseem ceeb suav nrog cov hauv qab no:
Dej solubility thiab solubility
Feem ntau cov kws kho mob cellulose muaj cov dej solubility zoo thiab tuaj yeem yaj nyob rau hauv cov dej txias lossis dej kub kom tsim cov tshuaj colloidal. Piv txwv li, HPMC, CMC, thiab lwm yam. Yuav tau siv dav hauv kev thov cov xwm txheej zoo li no kom thickening, ncua kev tsim.
Thickening thiab zaj duab xis-ua cov khoom
Cov neeg muaj kev pab cuam cellulose muaj cov khoom siv thicking zoo heev thiab tuaj yeem ua kom pom zoo ntxiv cov tshuaj viscosity ntawm aqueous. Piv txwv li, ntxiv HPMC rau cov khoom siv tsev tuaj yeem txhim kho cov plasticity thiab kev ua haujlwm ntawm cov khoom sib xyaw. Nyob rau tib lub sijhawm, cellulose cellulose cov neeg muaj kev sib sau ua yeeb yaj kiab zoo nyob rau ntawm cov khoom ntiag tug ntawm cov khoom, yog li lawv tau siv cov txheej txheej thiab yeeb tshuaj pleev tshuaj yeeb.
Dej tuav thiab ruaj khov
Cellulose neeg muaj kev hais ua haujlwm tseem muaj lub peev xwm ua tau dej zoo, tshwj xeeb hauv thaj teb ntawm cov ntaub ntawv tsim tsev. Cov cellulose muaj kev hais ua haujlwm feem ntau siv los txhim kho cov dej khib nyiab ntawm cov xis cug shrinkage cracks, thiab ncua kev pabcuam lub neej ntawm cug. Hauv cov teb zaub mov, cmc kuj tau siv los ua tus nyiam kom ncua cov zaub mov kom qhuav.
Tshuaj Muaj Peev Xwm
Cellulose Cov neeg muaj kev hais ua yeeb yam zoo ua tshuaj lom neeg ruaj khov hauv acid, thiab tuaj yeem tswj lawv cov qauv thiab muaj nuj nqi nyob rau hauv ntau yam ntawm cov khoom siv nyuaj. Qhov no tso cai rau lawv siv ntau yam kev lag luam tsis muaj kev cuam tshuam los ntawm lwm cov tshuaj.
3. Cov txheej txheem ntau lawm ntawm cellulose ether
Kev tsim cov cellulose ether yog feem ntau npaj los ntawm etherification cov tshuaj tiv thaiv ntawm cov cellulose ntuj. Cov txheej txheem txheej txheem txheej txheem muaj xws li kev kho mob ntawm cellulose, etherification cov tshuaj tiv thaiv, kev ua kom huv, thiab lwm yam.
Kev Kho Mob Alkalization
Ua ntej, ntuj cellulose (xws li paj rwb, ntoo, thiab lwm yam) yog alkalized los hloov lub cellulose rau hauv cov ntsev tsis muaj dej cawv heev.
Etherification cov tshuaj tiv thaiv
Lub cellulose tom qab alkalization reacts nrog ib tug neeg sawv cev ntawm methming rau methham vloride, epylene oxide, thiab lwm yam) los tsim cellulose ether. Ua raws li cov tshuaj tiv thaiv, sib txawv ntawm cov ntawm cov cellulose muaj kev hais ua ke tuaj yeem tau txais.
Purification thiab kom qhuav
Lub cellulose ether generated los ntawm cov tshuaj tiv thaiv yog huv, ntxuav thiab qhuav kom tau txais cov hmoov lossis cov khoom lag luam. Lub cev tsis huv thiab lub cev ntawm cov khoom kawg tuaj yeem tswj tau los ntawm cov thev naus laus zis tom ntej.
4. Cov ntawv thov ntawm cellulose ether
Vim yog lub cev muaj zog tshwj xeeb thiab tshuaj lom neeg ntawm cellulose muaj kev hais ua neeg muaj kev pab, lawv tau siv dav hauv ntau qhov kev lag luam. Daim ntawv thov tseem ceeb yog muaj raws li hauv qab no:
Tsev cov ntaub ntawv
Hauv kev ua haujlwm hauv tsev, cov neeg hais txog cellulose feem ntau yog siv li thickeners thiab dej tuav cov neeg sawv cev rau cov khoom sib xyaws xis thiab cov khoom lag luam gypsum. Cov cellulose pab xws li HPMC thiab MC tuaj yeem txhim kho kev tsim kho ntawm cug, txo cov dej poob, thiab yog li txhim kho adhesion thiab tawg tsis kam.
Tshuaj kho mob
Hauv kev lag luam kws tshuaj, cellulose tau siv dav siv raws li txheej xim rau cov tshuaj, cov nplaum rau cov ntsiav tshuaj, thiab cov ntaub ntawv tso tawm. Piv txwv li, HPMC feem ntau yog siv los npaj cov tshuaj pleev yeeb yaj kiab thiab muaj cov nyhuv zoo-tso tawm.
Mov
CMC feem ntau siv los ua tuab, emulsifier, thiab stabilizer nyob rau hauv kev lag luam khoom noj. Nws yog dav siv nyob rau hauv cov dej haus, misix, thiab cov khoom ci, thiab tuaj yeem txhim kho qhov saj thiab ua cov khoom noj uas muaj.
Tshuaj pleev ib ce thiab cov kuab lom txhua hnub
Cov kws hais ua haujlwm ntawm cellulose yog siv ua cov thickeners thiab emulsifiers thiab stabilizers hauv cov tshuaj pleev ib ce thiab tshuaj txhua hnub, uas tuaj yeem muab cov tshuaj lom neeg txhua hnub thiab kev ntxhib. Piv txwv li, HPMC feem ntau yog siv nyob rau hauv cov khoom xws li tshuaj txhuam hniav thiab zawv plaub hau los muab rau lawv muaj kuab zoo thiab muaj txiaj ntsig raug tshem tawm.
Txheej
Nyob rau hauv cov txheej txheej kev lag luam, cov neeg muaj kev hais ua cellulose yog siv ua cov tuab tuab, thiab cov neeg sawv cev ua yeeb yam, txhim kho kev ua yeeb yam, thiab muab cov xim pleev xim zoo.
5. Yav Tom Ntej Kev Loj Hlob Ntawm Cellulose Muaj Cov Neeg Muaj
Nrog rau kev siv nce ntxiv rau kev tiv thaiv ib puag ncig, cellulose ether, raws li ib qho kev pab cuam uas muaj cov khoom siv txuas ntxiv, muaj kev txhim kho dav dav. Nws cov biodegradability, kho dua tshiab thiab cov versatility ua rau nws xav tau ntau dua siv nyob rau hauv cov ntaub ntawv ntsuab, cov khoom siv tsis tau thiab cov ntaub ntawv ntse nyob rau yav tom ntej. Ib qho ntxiv, cellulose ether tseem muaj kev tshawb fawb ntxiv thiab kev nthuav dav cov liaj teb xws li biomedical engineering thiab cov ntaub ntawv qib siab.
Raws li cov khoom lag luam muaj txiaj ntsig tseem ceeb, cellulose ether muaj ntau yam ntawm daim ntawv thov tus nqi. Nrog nws cov dej ua tau zoo heev, cov dej khaws cia, ua yeeb yaj kiab zoo nkauj thiab tshuaj lom neeg ruaj khov, nws plays ib daim teb tsis muaj xws li kev tsim kho, tshuaj, thiab khoom noj. Nyob rau hauv lub neej yav tom ntej, nrog kev nce qib nruam ntawm thev naus laus zis thiab kev txhawb nqa ntawm celluls ntawm celluls ntawm kev txhim kho kev loj hlob ntawm ntau yam kev lag luam.
Lub Sijhawm Post: Sep-24-2024