Cellulose ether (xws li HPMC, HydroxyPropylulose) thiab MHEC (Methyl Hydrothethyl cellulose thiab siv dav hauv tsev mortars. Lawv ua lub luag haujlwm tseem ceeb hauv kev txhim kho lub zog ntawm cov neeg muaj nyiaj txiag, txhim kho kev tsim kho lub sijhawm thiab lub sijhawm ua haujlwm ntawm cov neeg muaj neeg tuag.
1. Cov khoom yooj yim ntawm HPMC thiab MHEC
HPMC yog cov polymer compound tau los ntawm kev hloov tshuaj lom neeg ntawm cov cellulose ntuj. Nws cov lwg me me muaj cov pab pawg me hydroxroplots thiab methyl pawg, uas ua rau nws muaj cov dej solubility zoo, thickening thiab ruaj khov. MHEC tau zoo ib yam li HPMC, tab sis nws muaj ntau hydroxyethyl pawg nyob rau hauv nws cov qauv molecular, yog li cov dej solubility thiab ua tau zoo ntawm MHEC sib txawv. Lawv tuaj yeem ob qho tib si qauv network hauv lub tshuaj khib thiab txhim kho cov yam ntxwv ntawm lub cev cug.
2. Mechanism ntawm kev ua ntawm cellulose ether hauv cug
Tom qab ntxiv HPMC lossis MHEC mus rau lub cug tshuaj tua ether molecules ua ib qho kev sib txuam nrog dej, lwm yam khoom siv tshuaj thiab cov ntxhia. Qhov system no tuaj yeem txhim kho txoj kev sib raug zoo ntawm cug cug.
Thickening cov nyhuv: HPMC thiab MHEC thiab MHEC tuaj yeem nce kev sib nphoo ntawm cug, ua rau nws ua haujlwm yooj yim thaum lub sijhawm kev tsim kho. Qhov no cov nyhuv tuab no kuj pab kom txo qis cov txiv qaub ncha, txhim kho cov nplaum ntawm cug, thiab yog li txhim kho txoj kev sib khi ntawm lub zog.
Dej retention nyhuv: cov qauv molecular ntawm pab pawg Hydrophricic, uas tuaj yeem nqus tau qhov chaw ua haujlwm loj thiab tso tawm kom qeeb, vim kev sib tsoo ntawm cov dej evaporation sai sai.
Txhim kho cov fluolity thiab kev tsim kho ether ether yuav pab txhim kho kom muaj qhov sib luag ntawm lub hauv paus, uas yog qhov sib luag ntawm kev faib tawm ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib koom tes ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev sib raug zoo ntawm kev koom tes.
3. Cov nyhuv ntawm cellulose ether on cap koom tes muaj zog
Qhov kev sib txuas ntawm cellulose ether krp feem ntau cuam tshuam ncaj qha rau kev sib khi lub zog ntawm cug. Tshwj xeeb, kev cuam tshuam ntawm HPMC thiab MHEC ntawm cap koom ua zog yog xav txog hauv cov hauv qab no:
3.1 Cuam tshuam rau thawj daim ntawv cog lus lub zog ntawm cug
HPMC thiab MHEC tuaj yeem txhim kho txoj kev sib raug zoo ntawm coll thiab hauv paus nto. Thaum kev tsim kho tsuas yog ua tiav, lub zog sib txuas ntawm lub cug sab nraud thiab lub substrate yog cuam tshuam ntau dua vim tias nqus dej kom qhuav ntawm cov cement muab tshuaj txhuam. Qhov no yog vim hais tias cov cement co dej cov tshuaj tiv thaiv tuaj yeem ua tiav txoj kev yooj yim, uas txhawb nqa cov tshuaj khib thaum ntxov ntawm lub tshuaj khib.
3.2 Cuam tshuam txog kev sib sau ua ke ntev ntawm cug
Raws li lub sijhawm dhau mus, cov cement tiv thaiv ntawm lub tshuaj khib undergoes ib txheej txheem pem teb tas li, thiab lub zog ntawm lub cug cov yuav nce ntxiv. Cov dej ua haujlwm ntawm cellulose tseem ceeb hauv cov txheej txheem no, tsis txhob txo lub zog txo los ntawm cov dej tsis txaus.
3.3 Txhim kho qhov tawg tsis kam ntawm tshuaj cug
HPMC thiab MHEC kuj tseem tuaj yeem txhim kho qhov tawg tawm ntawm cug. Nws cov tshuab kev nqis tes ua yog feem ntau los txhim kho cov dej sab hauv ntawm lub tshuaj khib nyiab thiab qeeb qeeb ntawm cov teeb meem evaporation los ntawm kev siv dej evaporation sai sai. Tsis tas li ntawd, cov qauv colloidal tsim los ntawm cellulose tsim los ntawm cov tshuaj khib nyiab txhim kho ntawm lub tshuaj khib, ua rau nws tsis tshua tawg ua kom tawg.
3.4 Cov teebmeem ntawm lub zog txhim kho ntawm cug cug
Cov kev tshawb fawb tau pom tias ntxiv tus nqi HPMC lossis MHEC tuaj yeem txhim kho lub zog ntawm lub zog ntawm kev muab qhov hnyav ntawm lub tshuaj khib. Feem ntau, cov kev ua tau zoo ntawm cellulose ether yog 0.5% -1.5%. Ua kom dhau ntxiv yuav ua rau cug cug kom muaj floty, uas nyeg cuam tshuam cuam tshuam nws cov khoom sib txuas lus. Yog li no, tus nqi tsim nyog ntawm cov cellulose ether ntxiv yog qhov tseem ceeb los txhim kho cov kev sib khi lub zog ntawm cug.
4. Kev sib piv ntawm ntau hom ntawm cov cellulose muaj cov neeg muaj cai
Txawm hais tias HPMC thiab MHEC yog zoo sib xws hauv lawv cov tshuab kev ua, lawv cov kev cuam tshuam ntawm kev sib khi lub zog ntawm cultch sib txawv hauv cov ntawv thov tiag tiag. MHEC yog hydrophilic ntau dua Holmc, MHEC yuav muaj kev cuam tshuam ntau dua rau kev txhim kho lub zog ua kom muaj zog. HPMC, ntawm qhov tod tes, yog ruaj khov nyob rau hauv qhov kub thiab cua sov li qub, thiab yog tsim nyog tshwj xeeb rau qee yam kev muab tshuaj pov tseg ib txwm npaj.
Cov cellulose neeg muaj neeg muaj kev pab (HPMC thiab MHEC) yog feem ntau siv cov tshuaj ntxiv rau cov neeg muaj zog, uas ua kom muaj kev nplua nuj los ntawm cov dej khov, dej tuav, thiab txhim kho fluented. Tsim nyog siv tshuaj ntawm cellulose ether yuav tsis tsuas yog txhim kho cov nplaum ntawm cap thiab substrate ntawm cape, thiab txuas ntxiv cov kev pabcuam lub neej ntawm kev xaiv. Txawv ntau hom cellulose muaj cov khoom siv sib txawv, thiab xaiv cov khoom lag luam zoo thiab ntau npaum li cas los txhim kho cov tshuaj khib.
Lub Sijhawm Post: Feb-19-2025