Cellulose ayher Piv txwv yog cov kab ke polymer ua los ntawm cov qauv ether. Txhua lub ci ntsa iab nyob rau hauv lub cellule macromolecule muaj peb pawg hydroxyl, cov pab pawg hydroxyl, thiab cov pab pawg hydroxyl ntawm ob thiab thib ob atoms. Lub hydrogen hauv cov pab pawg hydroxyl yog hloov los ntawm cov pab pawg hydrocarbon los ua cov cellulose. Nws yog cov khoom lag luam ntawm cov khoom ntawm hydroxyl hydrogen los ntawm hydrocarbon pawg hauv cellulose polymer. Cellulose yog polyhydroxy polymer compound uas tsis yaj tag nrho tsis yaj. Cellulose tuaj yeem yaj nyob rau hauv dej, dilute alkali daws thiab organic kuab tshuaj tom qab ethermication, thiab muaj thermoplastic khoom.
Cellulose ether yog qhov dav ntawm cov khoom lag luam tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab tus sawv cev rau qee yam. Alkali cellulose hloov los ntawm cov neeg sawv cev sib txawv kom tau cov neeg muaj kev hais txawv ntawm cellulose sib txawv.
Raws li Ionization cov yam ntxwv ntawm cov neeg tuaj yeem ua kom tsis raug cai tuaj yeem muab faib ua Ionic (xws li cov cellulose cellulose) thiab tsis yog tshuaj ntsuab (xws li methyl cellulose) ob pawg.
Raws li hom kev hloov kho, cov cellulose raug piv txwv yuav muab faib ua ib qho ether (xws li hydrothpropyl methyl cellulose). Raws li solubility, tuaj yeem muab faib ua cov dej soluble (xws li hydroxyethyl cellulose (xws li Ethyl cellulose). Qhuav tov qoob loo tsuas yog siv cov cellulose dej, uas tuaj yeem faib ua hom nrawm nroos thiab qeeb dissolving hom tom qab kev kho mob.
Admixtures ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom ntawm cov roj sib xyaw qhuav thiab cov nyiaj tau ntau dua 40% ntawm cov khoom siv hauv cov nqi sib xyaw qhuav. Ib feem ntau ntawm cov admixture hauv kev ua lag luam hauv tsev yog muab los ntawm cov chaw tsim khoom txawv teb chaws, thiab siv tshuaj txawv teb chaws, thiab cov ntaub ntawv siv tshuaj los ntawm cov khoom lag luam. Raws li qhov tshwm sim, tus nqi ntawm cov khoom noj qhuav-xyaw ua ke nyob twj ywm, thiab nws yog qhov nyuaj rau cov tshuaj khib nyiab thiab cov plaster ntau thiab ntau qhov chaw. High-end kev lag luam khoom lag luam yog tswj hwm los ntawm cov tuam txhab txawv teb chaws, cov tshuaj khib qhuav manufacturers, tus nqi tsis zoo; Daim ntawv thov ntawm admixture tsis muaj cov kab ke thiab kev tshawb nrhiav lub hom phiaj, dig muag ua raws cov qauv txawv teb chaws.
Dej rov tuav tus neeg saib xyuas yog tus tseem ceeb admixture los txhim kho kev sib xyaw ua ke ntawm qhuav messedures cov nqi ntawm cov nqi sib xyaw ua ke. Lub luag haujlwm tseem ceeb ntawm cellulose ether yog los khaws dej.
Qhov kev txiav txim mechanism ntawm cellulose ether hauv cug tshuaj yog raws li hauv qab no:
(1) Tshuaj khib hauv cellulose entholved hauv dej, thiab nyob rau hauv nws cov kev sib xyaw ua ke los ua kev sib xyaw ua ke thiab cov kev tsim kho ntawm cov npleem thiab kev tsim kho ntawm cov npleem tuaj yeem yog ib yam nkaus.
(2) Cellulose ether cov tshuaj vim nws tus kheej molecular qauv qauv tsis yooj yim, thiab tias cov dej tawm hauv lub sijhawm ntev, muab cug zoo dej ua kom muaj zog thiab ua haujlwm.
Lub Sijhawm Post: Dec-14-2021