Lub luag haujlwm ntawm hydroxypropyl methylcellulose (HPMC) hauv cov ntaub ntawv gypsum yog qhov tseem ceeb heev. Cov ntaub ntawv gypsum siv dav hauv kev tsim kho, kho kom zoo nkauj thiab lwm yam kev lag luam. Ua ib qho khoom siv ntau yam, HPMC siv dav hauv cov ntaub ntawv gypsum. Nws cov haujlwm tseem ceeb suav nrog kev txhim kho kev ua haujlwm ntawm gypsum slurry, txhim kho lub zog sib txuas, tswj lub sijhawm teeb tsa thiab txhim kho lub zog ntawm cov khoom.
Lub luag haujlwm tseem ceeb ntawm HPMC hauv gypsum
1. Txhim kho kev ua haujlwm zoo dua
HPMC tuaj yeem txhim kho kev ua haujlwm ntawm gypsum slurry, ua rau nws muaj kev ua haujlwm zoo dua thiab ua haujlwm tau zoo dua. Qhov no yog vim HPMC muaj cov nyhuv thickening zoo thiab tuaj yeem ua rau cov slurry viscosity ntau dua, yog li tiv thaiv cov slurry los ntawm delaminating, sinking thiab lwm yam xwm txheej thaum lub sijhawm tsim kho. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txhim kho kev ua haujlwm ntawm gypsum slurry, yog li nws yuav tsis qhuav vim yog dej evaporation sai thaum lub sijhawm tsim kho.
2. Txhim kho lub zog sib txuas
HPMC tuaj yeem ua kom lub zog sib txuas ntawm gypsum thiab substrate zoo dua. Qhov no yog vim HPMC tuaj yeem tsim cov qauv network zoo hauv gypsum slurry, uas ua rau muaj kev sib koom ua ke ntawm gypsum slurry, yog li txhim kho nws lub peev xwm sib txuas nrog lub substrate. Tsis tas li ntawd, HPMC kuj muaj qee qib ntawm kev ntub dej, uas tuaj yeem ua rau thaj chaw sib cuag ntawm gypsum slurry thiab qhov chaw ntawm lub substrate nce ntxiv, ua rau muaj kev sib txuas zoo dua.
3. Tswj lub sijhawm coagulation
HPMC tuaj yeem tswj tau lub sijhawm teeb tsa ntawm gypsum slurry. Kev ntxiv HPMC tuaj yeem ua rau qeeb qeeb ntawm qhov teeb tsa ntawm gypsum slurry, muab sijhawm txaus rau cov neeg ua haujlwm tsim kho kom ua haujlwm thiab kho, thiab zam kev puas tsuaj ntawm kev tsim kho los ntawm kev teeb tsa sai dhau. Qhov no tseem ceeb heev rau kev tsim kho thaj chaw loj thiab cov khoom siv plaster uas muaj cov duab nyuaj.
4. Txhim kho cov khoom siv kom ruaj khov
HPMC kuj tseem tuaj yeem txhim kho qhov ruaj khov ntawm cov ntaub ntawv gypsum. Kev ntxiv HPMC tuaj yeem txhim kho qhov tsis kam ntawm cov ntaub ntawv gypsum thiab tiv thaiv kev qhuav thiab tawg los ntawm kev hloov pauv kub thiab kev hloov pauv av noo. Tsis tas li ntawd, HPMC kuj muaj qee yam khoom tiv thaiv dej, uas tuaj yeem txo qhov kev yaig ntawm cov dej noo ntawm cov ntaub ntawv gypsum thiab txuas ntxiv lawv lub neej kev pabcuam.
Daim ntawv thov txoj cai ntawm HPMC hauv gypsum
1. Txoj cai ua kom tuab
Cov qauv molecular ntawm HPMC muaj ntau pawg hydroxyl thiab methyl. Cov pab pawg ua haujlwm no tuaj yeem tsim cov hydrogen bonds nrog cov dej molecules, yog li ua rau cov slurry viscosity ntau dua. Cov nyhuv thickening ntawm HPMC tsis yog tsuas yog txhim kho qhov fluidity thiab workability ntawm gypsum slurry, tab sis kuj txhim kho qhov ruaj khov ntawm slurry thiab tiv thaiv delamination thiab nag lossis daus.
2. Txoj cai khaws dej
HPMC muaj cov khoom zoo heev uas khaws dej tau zoo thiab tuaj yeem tsim cov zaj duab xis khaws dej sib xws hauv cov gypsum slurry kom txo cov dej evaporation. Cov nyhuv khaws dej ntawm HPMC tuaj yeem tiv thaiv cov slurry los ntawm kev tawg thiab ntsws thaum lub sijhawm ziab, txhim kho qhov zoo thiab siv cov nyhuv ntawm cov ntaub ntawv gypsum.
3. Txoj cai ntawm kev sib txuas
HPMC tuaj yeem tsim cov qauv zoo hauv cov gypsum slurry kom ua rau cov slurry sib koom ua ke. Tib lub sijhawm, qhov ntub dej ntawm HPMC tuaj yeem ua rau thaj chaw sib cuag ntawm cov gypsum slurry thiab qhov chaw ntawm lub substrate nce ntxiv, yog li txhim kho lub zog sib txuas.
4. Lub hauv paus ntsiab lus ntawm kev tswj lub sijhawm coagulation
HPMC tuaj yeem ncua qhov kev teeb tsa ceev ntawm gypsum slurry, feem ntau yog los ntawm kev kho qhov ceev ntawm cov tshuaj tiv thaiv hydration hauv slurry. Kev ntxiv HPMC tuaj yeem qeeb qhov kev tiv thaiv hydration ntawm calcium sulfate hauv gypsum slurry, ua rau slurry ua haujlwm ntev dua thiab ua haujlwm zoo dua.
5. Lub hauv paus ntsiab lus ntawm kev txhim kho kom ruaj khov
Qhov cuam tshuam ntawm HPMC tuaj yeem txhim kho qhov tsis kam ntawm cov khoom siv gypsum thiab tiv thaiv kev tawg qhuav thiab tawg los ntawm kev hloov pauv kub thiab kev hloov pauv av noo. Tsis tas li ntawd, kev ua haujlwm tsis muaj dej ntawm HPMC tuaj yeem txo qhov kev yaig ntawm cov khoom siv gypsum los ntawm dej thiab txuas ntxiv lawv lub neej kev pabcuam.
Kev siv HPMC hauv cov ntaub ntawv gypsum yog qhov tseem ceeb heev. Los ntawm kev txhim kho kev ua haujlwm ntawm gypsum slurry, txhim kho lub zog sib txuas, tswj lub sijhawm teeb tsa thiab txhim kho lub zog ntawm cov khoom, HPMC tuaj yeem txhim kho qhov zoo thiab siv cov txiaj ntsig ntawm cov ntaub ntawv gypsum. Yog li ntawd, HPMC tau dhau los ua qhov tseem ceeb thiab tseem ceeb ntawm cov ntaub ntawv gypsum hauv cov haujlwm tsim kho niaj hnub thiab kho kom zoo nkauj.
Lub sijhawm tshaj tawm: Lub Xya Hli-11-2024