HPMC (Hydroxypropyl Methylcellulose) yog ntau yam, ua tau zoo polymer dav siv nyob rau hauv kev tsim kho kev lag luam, feem ntau yog ib tug additive rau cement-based, gypsum-based thiab lwm yam khoom siv hauv tsev. Nws txhim kho qhov zoo thiab ua haujlwm ntev ntawm cov khoom siv hauv tsev los ntawm kev txhim kho cov dej tuav, kev tsim kho kev ua haujlwm thiab adhesion ntawm cov ntaub ntawv.
1. Cov dej tuav tau zoo heev
Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC yog nws cov dej tuav tau zoo, uas tuaj yeem txhim kho cov dej tuav cov ntaub ntawv xws li mortar thiab gypsum. Hauv cov cement mortar, pobzeb nplaum lossis gypsum-raws li cov ntaub ntawv, HPMC txo cov dej los ntawm kev tsim cov yeeb yaj kiab nyias los xyuas kom meej tias cov khoom khaws cov dej kom zoo thaum lub sijhawm kho. Qhov no tsis tsuas yog ncua sijhawm ua haujlwm ntawm cov khoom siv, tab sis kuj txhim kho kev tsim kho kom zoo thiab ua haujlwm zoo. Tshwj xeeb tshaj yog nyob rau hauv huab cua txias xws li kub thiab av noo tsawg, dej tuav kev ua tau zoo ntawm HPMC yog qhov tseem ceeb.
Txhim kho kev tsim kho kev ua haujlwm: Los ntawm kev khaws cov dej noo, HPMC txuas ntxiv lub sijhawm qhib ntawm cov ntaub ntawv xws li mortar thiab gypsum, ua kom lub sijhawm ua haujlwm ntawm cov neeg ua haujlwm, thiab yog li txhim kho qhov yooj yim ntawm kev tsim kho.
Txo kev tawg: Txij li cov dej noo ntawm cov khoom evaporates maj mam thaum lub sij hawm ziab, qhov teeb meem tawg los ntawm kev poob dej ntau dhau yog txo, tshwj xeeb tshaj yog nyob rau hauv daim ntawv nyias nyias (xws li tiling, sab hauv thiab sab nrauv phab ntsa plastering, thiab lwm yam).
2. Txhim kho kev tsim kho kev ua haujlwm
HPMC muaj cov nyhuv thickening zoo heev, uas ua rau cov khoom sib xws xws li mortar thiab gypsum zoo ib yam tom qab sib tov, kom tsis txhob muaj qhov tshwm sim ntawm sagging thiab poob ntawm cov ntaub ntawv thaum lub sij hawm tsim kho. Nws qhov sib txawv viscosity thiab molecular hnyav kuj ua rau HPMC hloov tau rau ntau yam kev tsim kho, xws li:
Hauv cov pobzeb nplaum, nws tuaj yeem txhim kho qhov adhesion ntawm cov ntaub ntawv kom ntseeg tau tias cov vuas tuaj yeem ruaj khov rau phab ntsa lossis cov plag tsev.
Hauv phab ntsa mortar, HPMC tuaj yeem ua rau mortar yooj yim dua thiab du, thiab tiv thaiv cov mortar los ntawm cov kua dej ntau dhau thiab cuam tshuam rau kev tsim kho.
HPMC kuj muaj lubricity zoo, uas tuaj yeem txo qhov kev sib txhuam ntawm cov ntaub ntawv thiab cov cuab yeej siv thaum lub sij hawm tsim kho, ua rau kev tsim kho kom zoo dua qub. Lubricity no tsis tsuas yog txo cov tensile tsis kam ntawm mortar, tab sis kuj txhim kho cov efficiency thiab zoo ntawm mortar daim ntawv thov.
3. Txhim kho kev sib raug zoo
Lub zog sib txuas hauv cov khoom siv hauv tsev yog qhov tseem ceeb ntawm kev ua tau zoo, tshwj xeeb tshaj yog rau cov ntaub ntawv xws li pobzeb adhesives thiab thermal rwb thaiv tsev mortars. HPMC ua kom ruaj khov mus ntev ntawm cov khoom siv hauv tsev los ntawm kev txhim kho cov adhesion ntawm mortar los yog nplaum thiab cov substrate. Qhov kev ua tau zoo ntawm lub zog adhesion yog qhov tseem ceeb rau kev tso cov ntaub ntawv xws li cov vuas thiab gypsum boards, thiab tuaj yeem tiv thaiv cov khoom los ntawm kev poob los yog warping vim kev sib txuas tsis zoo.
HPMC, los ntawm nws cov thickening thiab dej tuav cov teebmeem, ua rau cov cement hydration cov tshuaj tiv thaiv ntawm cov mortar ua kom tiav thaum lub sij hawm hardening txheej txheem tom qab kev tsim kho, tsim ib tug nruj kev sib raug zoo qauv. Yog li ntawd, lub zog tensile, compressive zog thiab durability ntawm cov khoom tom qab ziab yog ho txhim kho.
4. Txhim kho kev tiv thaiv kev ua haujlwm
Thaum lub sij hawm tso cov pobzeb, kev ua haujlwm tiv thaiv plam yog qhov taw qhia tseem ceeb rau kev ntsuas cov khoom zoo. HPMC txhim kho cov thixotropy ntawm cov nplais nplaum, ua rau nws tsis tshua muaj rau cov vuas kom plam thaum muab tso rau ntawm qhov chaw ntsug. Cov yam ntxwv no yog qhov tseem ceeb tshwj xeeb rau kev tso cov vuas loj, kom ntseeg tau tias cov vuas tuaj yeem raug muab tso rau hauv qhov tseeb thiab yuav tsis swb vim lub ntiajteb txawj nqus, yog li txhim kho kev tsim kho kom raug thiab zoo nkauj.
Tsis tas li ntawd, kev tiv thaiv kev ua haujlwm ntawm HPMC kuj tseem tuaj yeem txo qhov kev ua haujlwm tsis tsim nyog thaum lub sijhawm tsim kho, txhim kho kev tsim kho, thiab txo cov khoom pov tseg.
5. Txhim khu khov-thaw tsis kam
Hauv cov cheeb tsam txias, cov khoom siv hauv tsev ntsib qhov kev sib tw ntawm lub voj voog khov-thaw. Kev hloov pauv ntawm qhov kub thiab txias yuav ua rau kev nthuav dav thiab kev cog lus ntawm cov ntaub ntawv, yog li cuam tshuam rau lawv qhov ruaj khov thiab kav ntev. Qhov sib ntxiv ntawm HPMC tuaj yeem txhim kho qhov khov-thaw tsis kam ntawm cov ntaub ntawv xws li mortar, thiab tiv thaiv cov kab nrib pleb lossis tev ntawm cov ntaub ntawv vim yog lub voj voog khov-thaw.
HPMC tsim cov txheej txheem hloov pauv hauv cov ntaub ntawv cement-based los ntawm nws cov dej tuav, uas tuaj yeem cuam tshuam qhov kev ntxhov siab los ntawm kev hloov kub thiab txo qhov kev puas tsuaj los ntawm kev nthuav dav lossis kev cog lus ntawm cov ntaub ntawv. Yog li ntawd, nws yog dav siv nyob rau hauv lub tsev daim ntawv thov nrog siab yuav tsum tau rau freeze-thaw kuj, xws li sab nrauv phab ntsa rwb thaiv tsev systems thiab pem teb cov ntaub ntawv.
6. Ib puag ncig tus phooj ywg thiab tsis muaj tshuaj lom
HPMC yog ib qho tshuaj lom neeg ruaj khov polymer uas tsis tso cov pa phem lossis cov pa phem, thiab ua tau raws li qhov xav tau ntawm kev tsim kho niaj hnub no rau kev tiv thaiv ib puag ncig thiab kev noj qab haus huv. Thaum lub sijhawm ua ntawv thov, HPMC yuav tsis muaj teebmeem rau tib neeg lub cev, thiab yooj yim rau degrade nyob rau hauv ib puag ncig ntuj, uas yog ib puag ncig zoo.
Cov yam ntxwv uas tsis muaj tshuaj lom thiab ib puag ncig tus phooj ywg no ua rau HPMC yog qhov kev xaiv zoo tshaj plaws rau cov khoom siv ntsuab, tshwj xeeb tshaj yog cov khoom siv xws li cov xim pleev xim thiab cov hmoov putty siv dav hauv kev kho kom zoo nkauj sab hauv. Nws tuaj yeem txo cov pa phem hauv tsev thiab ua kom muaj kev nyab xeeb thiab kev noj qab haus huv ntawm qhov chaw nyob.
7. Txhim kho tshuaj tiv thaiv
Cov khoom siv hauv tsev feem ntau yuav tsum tau ntsib kev yaig ntawm ntau yam tshuaj thaum siv, xws li cov kua qaub nag, cov khoom siv khib nyiab, cov tshuaj detergents, thiab lwm yam. HPMC tuaj yeem txhim kho cov tshuaj tiv thaiv corrosion ntawm cov ntaub ntawv thiab txuas ntxiv lub neej kev pab cuam ntawm cov ntaub ntawv. Tshwj xeeb tshaj yog nyob rau hauv qee cov ntaub ntawv hauv tsev uas raug rau ib puag ncig sab nraud, HPMC tuaj yeem muab kev tiv thaiv ntxiv rau cov ntaub ntawv, txo cov tshuaj yaig ntawm cov ntaub ntawv, thiab tswj kev ruaj ntseg ntawm lawv cov kev ua tau zoo.
8. Lwm yam khoom
Ntxiv nrog rau cov yam ntxwv tseem ceeb saum toj no, HPMC muaj qee yam khoom tseem ceeb hauv kev tsim kho:
Anti-sagging: Cov nyhuv thickening ntawm HPMC tuaj yeem khaws cov ntaub ntawv xws li mortar thiab xim ruaj khov tom qab siv, thiab nws tsis yooj yim rau sag.
Txhim kho kev tsim kho kom zoo: Txij li HPMC tuaj yeem txhim kho kev tsim kho ntawm cov ntaub ntawv zoo, nws txo cov khoom pov tseg thiab rov ua haujlwm dua, yog li txhim kho kev tsim kho tag nrho.
Lub sijhawm qhib: HPMC tuaj yeem txuas ntxiv lub sijhawm qhib ntawm cov ntaub ntawv, nce kev tsim kho kom yooj yim, thiab tso cai rau cov neeg ua haujlwm kho thiab kho cov txiaj ntsig kev tsim kho nyob rau lub sijhawm ntev.
Raws li cov khoom siv hauv tsev ua tau zoo, HPMC muaj cov dej tuav tau zoo, kev tsim kho kev ua haujlwm, kev sib txuas ntawm lub zog thiab kev ua haujlwm tsis zoo, thiab ua tau zoo hauv kev tiv thaiv ib puag ncig, tshuaj tiv thaiv thiab khov-thaw. Nws tuaj yeem tsis tsuas yog txhim kho cov khoom siv hauv tsev, tab sis kuj txhim kho kev tsim kho thiab txo cov khoom pov tseg. Yog li ntawd, HPMC muaj ntau yam kev cia siab nyob rau hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog nyob rau hauv cov cement-based thiab gypsum-based cov ntaub ntawv, HPMC tau dhau los ua cov khoom tseem ceeb uas tsis tseem ceeb.
Post lub sij hawm: Sep-12-2024