HPMC (hydroxypropyl methylcellulose)yog ib yam khoom siv polymer uas yaj tau hauv dej uas siv dav hauv cov khoom siv cement, tshwj xeeb tshaj yog hauv kev tsim cov mortar qhuav, cov nplaum pobzeb, cov txheej txheem phab ntsa, gypsum thiab lwm yam khoom siv hauv tsev.
1. Txhim kho kev ua haujlwm thiab kev ua haujlwm tau zoo
HPMC muaj cov nyhuv ua kom tuab zoo heev thiab tuaj yeem txhim kho qhov fluidity thiab viscosity ntawm cov khoom siv cement, ua rau nws yooj yim dua rau kev ua haujlwm thaum lub sijhawm tsim kho. Tom qab ntxiv HPMC, kev ua haujlwm ntawm cov ntaub ntawv xws li mortar thiab adhesives tau zoo dua qub, ua rau nws du rau cov neeg siv thov, trowel, thiab lwm yam, txo qhov kev sib txhuam thaum lub sijhawm tsim kho, thiab txhim kho kev ua haujlwm zoo thiab zoo ntawm kev tsim kho.
2. Txuas sijhawm qhib thiab txhim kho kev ua haujlwm ntawm kev tsim kho
HPMC tuaj yeem ncua lub sijhawm teeb tsa thawj zaug ntawm cov khoom siv cement, ua rau cov neeg ua haujlwm tsim kho muaj sijhawm ua haujlwm ntev dua thaum lub sijhawm tsim kho. Lub sijhawm qhib tom qab tsim kho ntawm cov khoom siv cement (piv txwv li lub sijhawm uas cov khoom siv tseem tuaj yeem tswj tau ua ntej ua kom tawv) tau ntev dua. Rau cov haujlwm tsim kho loj lossis kev tsim kho cov qauv nyuaj, kev ncua sijhawm qhib tuaj yeem txo qhov nyuaj ntawm kev tsim kho thiab kev poob los ntawm kev khov ua ntej lub sijhawm, tshwj xeeb tshaj yog nyob rau hauv qhov chaw kub siab.
3. Txhim kho kev nplaum thiab kev tiv thaiv dej
HPMC tuaj yeem ua kom cov khoom siv cement lo rau zoo dua, ua rau lawv lo rau lub substrate zoo dua thiab ua kom lub zog sib txuas ntawm cov khoom sib txawv. Hauv cov ntawv thov xws li cov nplaum pobzeb thiab gypsum, HPMC tuaj yeem ua kom zoo dua qhov lo rau ntawm lub hauv paus thiab txo qhov kev pheej hmoo ntawm kev poob ntawm cov pobzeb, gypsum boards thiab lwm yam khoom. Tsis tas li ntawd, HPMC muaj kev tiv thaiv dej zoo, uas tuaj yeem txhim kho kev ua tau zoo ntawm cov khoom siv cement hauv qhov chaw noo noo, txo qhov cuam tshuam ntawm cov dej noo rau cov khoom siv cementitious, thiab txuas ntxiv lub neej ua haujlwm ntawm cov khoom.
4. Txhim kho qhov tawg tsis kam
Kev siv ntawmHPMCHauv cov khoom siv cement pab txhim kho kev tiv thaiv kab nrib pleb, tshwj xeeb tshaj yog hais txog kev ziab shrinkage. Cement mortar feem ntau yuav tawg thaum lub sijhawm dej evaporation. HPMC tuaj yeem kho qhov dej evaporation ntawm cov khoom siv cement kom txo qhov tshwm sim ntawm kab nrib pleb. Los ntawm kev hloov cov txheej txheem hydration ntawm cov khoom siv cement, HPMC tuaj yeem txo cov kab nrib pleb los ntawm qhov sib txawv ntawm qhov kub thiab txias, kev hloov pauv av noo lossis kev ntxhov siab sab hauv ntawm cov khoom siv cement nws tus kheej, yog li txhim kho qhov ruaj khov ntawm cov khoom.
5. Txhim kho kev tiv thaiv kev ua npuas dej thiab kev ruaj khov
HPMC tuaj yeem tswj tau cov npuas dej hauv cov khoom ua los ntawm cement thiab txhim kho lawv cov yam ntxwv tiv thaiv kev ua npuas dej. Qhov tshwm sim ntawm cov npuas dej hauv cov khoom ua los ntawm cement yuav cuam tshuam rau lub zog, kev sib zog thiab qhov zoo nkauj ntawm cov khoom. Kev ntxiv HPMC tuaj yeem ua kom cov qauv ntawm cov slurry ruaj khov thiab txo qhov tsim ntawm cov npuas dej, yog li txhim kho qhov kev sib zog thiab kev ua tau zoo ntawm cov khoom.
6. Txhim kho qhov du thiab zoo nkauj ntawm qhov chaw
Hauv ntau yam khoom siv cement, qhov du thiab zoo li cas muaj feem cuam tshuam loj rau kev sib tw ua lag luam ntawm cov khoom kawg. HPMC tuaj yeem txhim kho qhov fluidity ntawm cov khoom siv cement, ua rau lawv cov nplaim du thiab du, thiab txo qhov tsis zoo xws li tev tawv thiab npuas thaum lub sijhawm tsim kho, yog li txhim kho qhov zoo li ntawm cov khoom. Tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov xws li coatings thiab vuas nplaum, HPMC tuaj yeem ua kom qhov chaw zoo nkauj thiab ua tiav cov teebmeem pom zoo dua.
7. Txhim kho qhov kev hloov kho tau thiab kev hloov pauv tau ntau yam
HPMC yog ib yam khoom siv uas tuaj yeem hloov kho rau ntau yam kev xav tau. Los ntawm kev hloov nws cov qauv molecular (xws li ntau qib ntawm hydroxypropylation, methylation, thiab lwm yam), qhov kev ua tau zoo ntawm thickening, solubility, qeeb teeb tsa lub sijhawm thiab lwm yam ntxwv ntawm HPMC tuaj yeem hloov kho, yog li muab kev hloov kho rau ntau hom khoom siv cement. Piv txwv li, rau cov nplaum pobzeb ua haujlwm siab thiab cov tshuaj kho, cov qauv sib txawv ntawm HPMC tuaj yeem siv los ua kom tau raws li ntau yam kev xav tau kev tsim kho.
8. Txhawb kev tiv thaiv ib puag ncig thiab kev txuag hluav taws xob
Ua ib yam khoom siv polymer ntuj, HPMC feem ntau tsis muaj tshuaj lom, tsis muaj teeb meem thiab ua tau raws li qhov yuav tsum tau ua kom muaj kev tiv thaiv ib puag ncig. Kev siv cov khoom siv cement ntawm HPMC tsis yog tsuas yog txhim kho kev ua haujlwm ntawm kev tsim kho xwb, tab sis kuj txo cov kev cuam tshuam tsis zoo rau ib puag ncig. Tsis tas li ntawd, kev ntxiv HPMC tuaj yeem txo cov cement, txuag hluav taws xob, thiab pab txhim kho kev ua haujlwm ntev ntawm cov khoom siv cement thiab txo cov nqi kho.
9. Txhim kho kev ruaj khov ntawm thermal
HPMC muaj qee qhov kev ruaj khov thermal thiab tuaj yeem tswj tau qhov ua tau zoo ntawm qhov kub siab dua. Hauv qee qhov kev siv tshwj xeeb, xws li cov khoom siv cement hauv qhov chaw kub siab, HPMC tuaj yeem muab qhov ruaj khov thermal zoo dua, kom ntseeg tau tias cov khoom tseem tuaj yeem tswj tau qhov kev ua tau zoo ntawm kev tsim kho thiab kev ua haujlwm ntev hauv qhov kub siab.
10. Txhim kho kev ua kom du thiab sib npaug
HPMC tuaj yeem ua rau cov khoom xyaw hauv cov khoom siv cement faib tau zoo dua thiab txo qhov sib txawv ntawm kev ua tau zoo los ntawm qhov tsis sib xws. Nws txhim kho qhov fluidity ntawm cov slurry thiab zam kev tshwm sim ntawm cov pob zeb lossis cov khoom me me, yog li ua kom muaj kev sib xws thiab sib xws thoob plaws hauv cov khoom sib tov.
Ua ib qho khoom siv ntxiv rau cov khoom siv cement,HPMCTsis yog tsuas yog txhim kho qhov ua haujlwm tau zoo, kev nplaum, kev tiv thaiv dej, kev tiv thaiv tawg thiab qhov zoo ntawm cov khoom, tab sis kuj txhim kho kev tsim kho kom zoo thiab ntev lub neej kev pabcuam ntawm cov khoom. Nws cov yam ntxwv zoo heev ntawm kev ua kom tuab, tiv thaiv kev khov, txhim kho kev tiv thaiv tawg, tiv thaiv kev ua npuas dej thiab tswj kev ntws ua rau HPMC yog qhov tseem ceeb ntxiv rau cov khoom siv hauv tsev niaj hnub. Raws li kev lag luam kev tsim kho qhov kev thov rau cov ntaub ntawv ua tau zoo nce ntxiv, kev siv HPMC hauv cov khoom siv cement yuav dav dua.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-07-2024