Lub luag haujlwm ntawm hydroxypropyl methylcellulose (HPMC) hauv gypsum cov ntaub ntawv tseem ceeb heev. Gypsum cov ntaub ntawv yog dav siv hauv kev tsim kho, kho kom zoo nkauj thiab lwm yam kev lag luam. Raws li ib tug multifunctional additive, HPMC yog dav siv nyob rau hauv cov ntaub ntawv gypsum. Nws lub luag haujlwm tseem ceeb suav nrog kev txhim kho kev ua haujlwm ntawm gypsum slurry, txhim kho kev sib raug zoo ntawm lub zog, tswj lub sijhawm teem sijhawm thiab txhim kho cov khoom siv.
Lub luag haujlwm tseem ceeb ntawm HPMC hauv gypsum
1. Txhim kho kev ua haujlwm
HPMC tuaj yeem txhim kho kev ua haujlwm ntawm gypsum slurry, ua kom nws muaj dej zoo dua thiab ua haujlwm tau zoo. Qhov no feem ntau yog vim HPMC muaj cov nyhuv thickening zoo thiab tuaj yeem ua kom cov viscosity ntawm slurry, yog li tiv thaiv cov slurry los ntawm delaminating, sinking thiab lwm yam tshwm sim thaum lub sij hawm tsim kho. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txhim kho cov dej khaws cia ntawm gypsum slurry, yog li nws yuav tsis qhuav tawm vim cov dej evaporation sai thaum lub sijhawm tsim kho.
2. Txhim khu kev sib txuas
HPMC tuaj yeem txhim kho lub zog sib txuas ntawm gypsum thiab substrate. Qhov no yog vim hais tias HPMC tuaj yeem tsim cov qauv zoo hauv lub gypsum slurry, uas ua rau kom muaj kev sib koom ua ke ntawm gypsum slurry, yog li txhim kho nws cov peev xwm sib txuas nrog cov substrate. Tsis tas li ntawd, HPMC kuj tseem muaj qee qhov kev ntub dej, uas tuaj yeem ua rau thaj chaw sib cuag ntawm gypsum slurry thiab qhov chaw ntawm lub substrate, ntxiv dag zog rau kev sib txuas lus.
3. Tswj lub sijhawm coagulation
HPMC tuaj yeem tswj tau lub sijhawm teem sijhawm ntawm gypsum slurry. Qhov sib ntxiv ntawm HPMC tuaj yeem ua kom qeeb ntawm qhov teeb tsa ntawm gypsum slurry, muab cov neeg ua haujlwm tsim kho kom muaj sijhawm txaus los ua haujlwm thiab kho, thiab zam kev tsim kho tsis zoo los ntawm kev teeb tsa nrawm dhau. Qhov no yog ib qho tseem ceeb tshwj xeeb rau kev tsim kho thaj tsam loj thiab cov khoom siv zoo li plaster.
4. Txhim kho cov khoom siv ntev
HPMC kuj tseem tuaj yeem txhim kho qhov ruaj khov ntawm cov ntaub ntawv gypsum. Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho qhov tawg ntawm cov ntaub ntawv gypsum thiab tiv thaiv kom qhuav thiab tawg los ntawm qhov kub thiab txias hloov pauv. Tsis tas li ntawd, HPMC kuj muaj qee yam dej tsis zoo, uas tuaj yeem txo qhov yaig ntawm cov khoom siv gypsum thiab txuas ntxiv lawv lub neej kev pab.
Kev siv lub hauv paus ntsiab lus ntawm HPMC hauv gypsum
1. Thickening txoj cai
Cov qauv molecular ntawm HPMC muaj ntau ntawm hydroxyl thiab methyl pawg. Cov pab pawg ua haujlwm no tuaj yeem tsim cov hydrogen bonds nrog dej molecules, yog li ua kom cov viscosity ntawm slurry. Cov nyhuv thickening ntawm HPMC tuaj yeem tsis tsuas yog txhim kho lub fluidity thiab kev ua haujlwm ntawm gypsum slurry, tab sis kuj txhim kho kev ruaj ntseg ntawm slurry thiab tiv thaiv delamination thiab nag lossis daus.
2. Txoj cai tuav dej
HPMC muaj cov khoom tuav dej zoo heev thiab tuaj yeem tsim cov yeeb yaj kiab dej tsis sib xws hauv gypsum slurry los txo cov dej evaporation. Cov dej tuav cov nyhuv ntawm HPMC tuaj yeem tiv thaiv cov slurry los ntawm kev tawg thiab shrinking thaum lub sij hawm ziab, txhim kho qhov zoo thiab siv cov khoom siv gypsum.
3. Kev sib khi txoj cai
HPMC tuaj yeem tsim cov qauv zoo sib xws hauv cov gypsum slurry kom muaj kev sib koom ua ke ntawm cov slurry. Nyob rau tib lub sijhawm, lub wettability ntawm HPMC tuaj yeem ua rau thaj chaw sib txuas ntawm gypsum slurry thiab qhov chaw ntawm lub substrate, 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 los ntawm kev kho cov tshuaj tiv thaiv hydration ceev hauv slurry. Qhov sib ntxiv ntawm HPMC tuaj yeem ua rau qeeb ntawm cov tshuaj tiv thaiv dej ntawm calcium sulfate hauv gypsum slurry, muab cov slurry rau lub sijhawm ua haujlwm ntev thiab kev tsim kho zoo dua.
5. Lub hauv paus ntsiab lus ntawm kev txhim kho durability
Lub zog txhawb zog ntawm HPMC tuaj yeem txhim kho qhov tawg tsis kam ntawm cov ntaub ntawv gypsum thiab tiv thaiv kom qhuav tawg thiab tawg los ntawm qhov kub thiab txias hloov pauv. Tsis tas li ntawd, cov dej tsis zoo ntawm HPMC tuaj yeem txo qhov kev yaig ntawm cov ntaub ntawv gypsum los ntawm dej thiab txuas ntxiv lawv lub neej kev pab.
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 daim ntawv cog lus muaj zog, tswj lub sijhawm teem sijhawm thiab txhim kho cov khoom siv, HPMC tuaj yeem txhim kho qhov zoo thiab siv cov khoom siv gypsum. Yog li ntawd, HPMC tau dhau los ua qhov tseem ceeb thiab tseem ceeb ntawm cov khoom siv gypsum hauv kev tsim kho thiab kho kom zoo nkauj niaj hnub.
Post lub sij hawm: Lub Xya hli ntuj-11-2024