Hydroxypropyl methylcellulose (HPMC) yog ib qho tshuaj ntxiv uas siv dav hauv cov ntaub ntawv siv hauv kev tsim kho, tshwj xeeb tshaj yog cov khoom siv plaster series. Nws cov qauv tshuaj lom neeg ua rau nws yaj tau zoo heev hauv dej, hloov kho viscosity thiab ua haujlwm ntawm qhov chaw, yog li ua lub luag haujlwm tseem ceeb hauv stucco plaster.
1. Cov khoom ua kom tuab thiab sib txuas
Ua ib qho thickener, HPMC tuaj yeem ua rau kom qhov sib xws thiab viscosity ntawm plaster ntau ntxiv. Qhov feature no tso cai rau cov gypsum slurry kom npog qhov chaw substrate thaum lub sijhawm tsim kho thiab tiv thaiv kom tsis txhob sagging. Tsis tas li ntawd, cov khoom sib txuas ntawm HPMC pab txhim kho lub zog sib txuas ntawm gypsum thiab cov khoom hauv qab, ua kom ntseeg tau tias muaj kev ruaj khov thiab ruaj khov ntawm cov txheej saum npoo tom qab tsim kho. Qhov no yog qhov tseem ceeb rau kev siv rau ntawm cov chaw ntsug thiab siab xws li phab ntsa thiab qab nthab.
2. Kev khaws dej
Kev khaws dej yog lwm txoj haujlwm tseem ceeb ntawm HPMC hauv stucco plaster. Vim tias cov ntaub ntawv gypsum xav tau cov tshuaj tiv thaiv hydration thaum lub sijhawm tsim kho, kev poob dej sai sai yuav ua rau cov khoom tsis khov kho, yog li cuam tshuam rau nws lub zog thiab kev ruaj khov. HPMC tuaj yeem khaws cov dej noo thiab ncua qhov dej evaporation, yog li gypsum tuaj yeem tau txais cov dej noo txaus thaum lub sijhawm tsim kho thiab theem pib tawv. Qhov no tsis yog tsuas yog pab txhim kho kev ua haujlwm ntawm kev tsim kho, tab sis kuj txhim kho qhov zoo ntawm cov khoom tiav thiab txo qhov tshwm sim ntawm cov kab nrib pleb.
3. Txhim kho kev ua haujlwm ntawm kev tsim kho
Qhov ntxiv ntawm HPMC tuaj yeem txhim kho kev ua tau zoo ntawm stucco gypsum. Ua ntej tshaj plaws, nws tuaj yeem txhim kho lubricity ntawm cov slurry, ua rau gypsum swb du dua ntawm cov cuab yeej tsim kho thiab txhim kho kev ua haujlwm ntawm kev tsim kho. Qhov thib ob, HPMC tuaj yeem kho qhov rheology ntawm cov slurry, ua rau nws yooj yim dua rau kev nthuav dav thiab theem, yog li txo lub sijhawm tsim kho thiab kev siv zog. Tsis tas li ntawd, vim tias HPMC txhim kho qhov kev nplaum ntawm gypsum slurry, cov khoom pov tseg raug txo qis thaum lub sijhawm tsim kho, uas yog qhov tseem ceeb heev rau kev txuag nqi.
4. Txhim kho qhov tawg tsis kam
Hauv kev tsim kho vaj tse, cov kab nrib pleb yog ib qho teeb meem tseem ceeb uas cuam tshuam rau qhov tsos thiab kev ua haujlwm ntawm lub tsev. Cov dej khaws cia thiab cov khoom tuab ntawm HPMC tuaj yeem txo qhov tshwm sim ntawm cov kab nrib pleb. Los ntawm kev ua kom cov viscosity thiab toughness ntawm gypsum, HPMC tuaj yeem ua rau qeeb qeeb ntawm qhov shrinkage ntawm slurry thiab txo qhov kev ntxhov siab shrinkage, yog li txo qhov kev tsim ntawm cov kab nrib pleb. Tsis tas li ntawd, HPMC tuaj yeem txhim kho qhov elasticity ntawm gypsum kom nws tuaj yeem teb tau zoo dua rau kev hloov pauv hauv qhov chaw sab nraud, xws li kev hloov pauv ntawm qhov kub thiab av noo, yog li txhim kho qhov ruaj khov ntawm cov chaw hauv tsev.
5. Hnav tsis kam thiab nto du
Kev siv HPMC kuj tseem tuaj yeem txhim kho qhov hnav tsis kam thiab qhov du ntawm cov stucco gypsum. Cov qauv zaj duab xis tsim los ntawm HPMC hauv cov slurry tuaj yeem ua rau qhov tawv thiab hnav tsis kam ntawm gypsum, ua rau nws qhov chaw muaj zog dua. Tib lub sijhawm, vim nws khaws dej zoo thiab ua kom tuab, qhov chaw gypsum yuav du thiab tiaj tus tom qab ua kom tawv, uas yog qhov tseem ceeb rau cov chaw tsim kho uas xav tau cov teebmeem zoo nkauj.
Kev siv hydroxypropyl methylcellulose (HPMC) hauv stucco gypsum series khoom muaj qhov zoo tseem ceeb. Nws tsis tsuas yog txhim kho kev ua haujlwm thiab kev ua haujlwm zoo ntawm kev tsim kho, tab sis kuj txhim kho cov khoom siv lub cev thiab kev zoo nkauj ntawm cov khoom tiav. HPMC muab kev xaiv ntxiv zoo thiab txhim khu kev qha rau kev lag luam cov ntaub ntawv tsim kho los ntawm nws cov khoom zoo heev thickening, dej khaws cia, sib txuas, tawg tsis kam thiab lwm yam khoom. Nrog rau kev txhim kho ntawm kev lag luam tsim kho thiab kev nce qib thev naus laus zis, kev siv HPMC hauv plaster thiab lwm yam ntaub ntawv tsim kho yuav dav dua.
Lub sijhawm tshaj tawm: Lub Yim Hli-12-2024