HPMC (HydroxyPropyyl methylcellulose)yog ib qho kev siv hom admixture feem ntau thiab yog siv dav hauv gypsum tshuaj khib. Nws cov haujlwm tseem ceeb yog txhawm rau txhim kho kev tsim kho ntawm cug, txhim kho cov dej khaws cia, txhim kho cov khoom zoo nkauj ntawm cug. Gypsum tshuaj yog ib lub tsev ua haujlwm nrog gypsum raws li lub ntsiab tivthaiv, uas feem ntau siv nyob rau hauv phab ntsa thiab qab zib kho kom zoo nkauj.
1. Cov nyhuv ntawm HPMC ntau npaum li cas ntawm cov dej khaws cia ntawm gypsum tshuaj khib
Dej rov tuav yog ib qho ntawm cov khoom siv tseem ceeb ntawm gypsum tshuaj khib, uas yog ncaj qha rau kev tsim kho kev tsim kho thiab tsev pheeb suab. HPMC, raws li cov molecular siab polymer, muaj cov dej zoo khaws cia. Nws cov lwg me me muaj ntau ntawm cov pab pawg hydroxyl thiab Ether. Cov pab pawg hydrophilic tuaj yeem tsim cov hlua dej hydrogen nrog cov lwg dej los txo cov dej tsis muaj zog. Yog li no, ntxiv ntawm tus nqi ntawm HPMC tuaj yeem txhim kho cov dej rov qab thiab tiv thaiv cov kab cug los ntawm kev ziab nrawm thiab tawg ntawm cov npoo thaum kev tsim kho.
Cov kev tshawb fawb tau pom tias nrog kev nce HPMC ntau npaum li cas, dej ceev ceev ntawm cug maj nce. Txawm li cas los xij, thaum cov tshuaj ntau dhau lawm, lub rheology ntawm lub tshuaj tua hluav taws xob yuav loj dhau, cuam tshuam kev ua haujlwm. Yog li ntawd, kev ua tau zoo ntawm HPMC yuav tsum tau hloov kho raws li kev siv tiag tiag.
2. Cov nyhuv ntawm HPMC ntau npaum li cas ntawm lub zog sib txuas ntawm Gypsum tshuaj khib
Lub zog ntawm lub zog yog lwm qhov kev sib raug zoo ntawm gypsum tshuaj khib, cuam tshuam ncaj qha cuam tshuam cov nplaum ntawm lub tshuaj khib thiab lub hauv paus. HPMC, raws li cov molecular siab polymer, tuaj yeem txhim kho cov cohesion thiab kev ua tau zoo ntawm lub cug. Txoj cai HPMC tuaj yeem txhim kho txoj kev tshuaj khib nyiab ntawm lub tshuaj khib, kom nws tuaj yeem tsim cov nplaum muaj zog nrog phab ntsa thiab substrate thaum tsim kho.
Kev tshawb fawb sim tau pom tias cov tshuaj HPMC muaj qhov cuam tshuam tseem ceeb ntawm lub zog ntawm lub zog ntawm lub tshuaj khib. Thaum HPMC kev tshuaj yog nyob rau hauv ib tug ntau ntau (feem ntau 0.2% -0.6%), Qhov sib txuas lus lub zog qhia pom txoj kev nce qib. Qhov no yog vim HPMC tuaj yeem txhim kho cov voltity ntawm lub cug, yog li nws tuaj yeem zoo dua rau cov substrate thaum kev tsim kho thiab txo qis thiab tawg. Txawm li cas los xij, yog tias cov tshuaj ntau dhau, cov tshuaj khib nyiab muaj ntau yam muaj flueion, cuam tshuam nws cov nplaum kom ua rau lub zog, yog li txo cov kev sib raug zoo.
3. Cov nyhuv ntawm HPMC ntau npaum li cas ntawm cov kua txiv thiab kev tsim kho ntawm gypsum tshuaj khib
Yog ib qho kev ua tau zoo tshaj plaws hauv kev tsim kho hauv cov txheej txheem kev tsim kho ntawm gypsum tshuaj khib, tshwj xeeb tshaj yog nyob rau hauv phab ntsa phab ntsa. Qhov kev sib txuas ntawm HPMC tuaj yeem txhim kho lub tshuaj txaws zoo nkauj, ua kom nws tsim thiab ua haujlwm. Cov yam ntxwv ntawm HPMC molecular qauv kom nws kom nce viscosity ntawm xhia los ntawm thickening, yog txhim kho cov kev ua haujlwm ntawm cug.
Thaum HPMC kev tshuaj yog tsawg, lub fluidity ntawm cug tsis zoo, uas tej zaum yuav ua rau cov teeb meem tsim txom thiab txawm tawg. Qhov tsim nyog ntawm HPMC ntau npaum li cas (feem ntau ntawm 0.2% -0.6%) tuaj yeem txhim kho nws cov txheej txheem kev ua haujlwm thiab cov nyhuv du, thiab yog li txhim kho kev tsim kho kev tsim kho. Txawm li cas los xij, yog tias cov tshuaj ntau dhau, cov txheej txheem tsim huv yuav dhau los ua cov txheej txheem tsim kom muaj mob heev, thiab nws yuav ua rau cov khoom pov tseg.
4. Cov nyhuv ntawm HPMC noj ntawm kom qhuav shrinkage ntawm gypsum tshuaj
Kom qhuav shrinkage yog lwm cov cuab yeej tseem ceeb ntawm gypsum tshuaj khib. Ntau dhau shrinkage yuav ua rau tawg rau ntawm phab ntsa. Qhov kev sib txuas ntawm HPMC tuaj yeem txo cov ziab khaub hlab ntawm cug. Qhov kev tshawb fawb pom tias HPMC tsim nyog tuaj yeem txo cov dej evaporation, yog li unceviating qhov teeb meem shrinkage ntawm gypsum tshuaj. Tsis tas li ntawd, cov qauv molecular ntawm HPMC tuaj yeem tsim cov qauv network ruaj khov, txuas ntxiv txhim kho cov kab cug ua paug.
Txawm li cas los xij, yog tias cov tshuaj HPMC dhau lawm, nws yuav ua rau lub tshuaj khib kom teeb tsa tau ntev dua, cuam tshuam rau kev tsim kho cov kev tsim kho. Nyob rau tib lub sijhawm, cov viscosity siab yuav ua rau kev faib dej tsis sib xws ntawm dej thaum kev tsim kho, cuam tshuam rau kev txhim kho ntawm shrinkage.
5. Cov nyhuv ntawm HPMC noj ntawm cov tawg ntawm gypsum tshuaj khib
Kev tawm tsam yog qhov taw qhia tseem ceeb rau kev ntsuam xyuas qhov zoo ntawm gypsum tshuaj khib. HPMC tuaj yeem txhim kho nws cov kev tawm tsam tsis kam los ntawm kev txhim kho lub zog compressive, adhesion thiab tawv ntawm lub cug. Los ntawm kev ntxiv tus nqi tsim nyog ntawm HPMC, cov tawg tawm ntawm gypsum tshuaj yuav hloov kho kom tsis txhob tawg lossis kev hloov pauv kub.
Qhov kev ua tau zoo ntawm HPMC feem ntau ntawm 0.3% thiab 0.5%, uas tuaj yeem txhim kho cov qauv sib xyaw thiab txo cov kab nrib pleb uas tshwm sim los ntawm qhov kub thiab txias. Txawm li cas los xij, yog tias cov tshuaj ntau dhau, cov viscosity ntau dhau yuav ua rau lub colle kom kho tau dhau los, yog li cuam tshuam nws tag nrho cov kev nthuav dav.
6. Kev ua kom zoo thiab siv tau ntawm HPMC noj tshuaj
Los ntawm kev tsom xam ntawm cov ntsuas kev ua tau saum toj no, cov tshuaj ntawmHPMCMuaj feem cuam tshuam tseem ceeb ntawm kev ua haujlwm ntawm gypsum tshuaj khib. Txawm li cas los xij, cov kev pom zoo ntau npaum li cas yog cov txheej txheem sib npaug, thiab cov tshuaj ntau zaus kom tau pom zoo kom 0.2% mus rau 0.6%. Cov chaw tsim khoom sib txawv thiab cov kev siv sib txawv yuav xav tau kev hloov kho kom haum rau cov tshuaj no kom ua tiav qhov kev ua tau zoo tshaj plaws. Hauv kev siv cov kev siv, ntxiv rau kev tshuaj HPMC, lwm yam uas yuav tsum tau txiav txim siab, cov khoom ntawm cov txheej txheem ntawm substrate, thiab cov xwm txheej tsim kho.
Qhov ntau npaum ntawm HPMC muaj qhov cuam tshuam tseem ceeb ntawm kev ua haujlwm ntawm Gypsum tshuaj khib. Tus nqi ntawm HPMC tsim nyog tuaj yeem txhim kho cov yam ntxwv tseem ceeb xws li cov dej tuav cia, tsev pheeb suab, thiab tawg tsis kam. Kev tswj cov kev siv tshuaj yuav tsum tau txiav txim siab txog qhov yuav tsum tau ua ntawm kev tsim kho thiab zaum kawg lub zog ntawm txoj kev tshuaj khib. Tsim nyog HPMC yuav tsis tsuas txhim kho kev tsim kho ntawm tshuaj khib, tab sis kuj txhim kho kev ua haujlwm ntev ntawm cug. Yog li ntawd, hauv kev tsim tiag tiag thiab kev tsim kho, cov tshuaj ntau ntawm HPMC yuav tsum tau ua kom zoo raws li qhov xav tau kom ua tiav cov nyhuv zoo.
Lub Sijhawm Post: Dec-16-2024