Hydroxypropyl methylcellulose (HPMC)yog ib qho khoom siv polymer tseem ceeb uas siv dav hauv cov txheej txheem dej tsis muaj cement. Lub luag haujlwm ntawm HPMC hauv cov txheej txheem dej tsis muaj cement yog qhov tseem ceeb, feem ntau pom hauv kev hloov pauv tuab, kev khaws dej zoo dua, kev ua haujlwm zoo dua thiab kev ua kom lub tsho ruaj khov dua.
1. Cov yam ntxwv tseem ceeb ntawm HPMC
HPMC yog cov cellulose ether uas tsis yog ionic nrog kev yaj dej zoo thiab kev ruaj khov tshuaj lom neeg. Cov hydroxypropyl thiab methyl pawg hauv nws cov qauv molecular muab nws zoo heev thickening, dej khaws cia thiab zaj duab xis-tsim cov khoom, ua rau nws ua lub luag haujlwm tseem ceeb hauv cov ntaub ntawv tsim kho.
2. Lub luag haujlwm ntawm HPMC hauv cov txheej txheem dej tsis muaj cement
(1) Ua kom tuab thiab txhim kho kev ua haujlwm ntawm kev tsim kho
HPMC tuaj yeem ua rau kom cov xim pleev xim tiv thaiv dej ntawm cov cement ua kom zoo dua, ua rau cov xim pleev muaj thixotropy thiab sib xws zoo dua, thiab tiv thaiv kev sagging lossis dej ntws thaum lub sijhawm tsim kho. Tsis tas li ntawd, kev ua kom tuab kom zoo tuaj yeem txhim kho kev ua haujlwm ntawm cov xim pleev, ua rau nws yooj yim dua rau kev thov thiab khawb, yog li ua kom ntseeg tau tias cov xim pleev sib xws thiab tuab.
(2) Txhim kho kev khaws dej thiab ua kom cov tshuaj tiv thaiv dej ntev dua
Qhov kev ua tau zoo ntawm kev khaws dej ntawm HPMC tuaj yeem txo qhov kev ua pa sai ntawm cov dej, xyuas kom meej tias cov txheej txheem hydration tag nrho ntawm cov cement, thiab tiv thaiv kev tawg thiab lub zog txo qis ntawm cov txheej uas tshwm sim los ntawm kev poob dej sai. Tshwj xeeb tshaj yog thaum tsim kho hauv qhov kub siab, qhuav ib puag ncig lossis ntawm lub hauv paus uas nqus tau zoo, qhov cuam tshuam ntawm kev khaws dej ntawm HPMC yog qhov tseem ceeb heev, uas pab tsim cov txheej txheem dej ntom ntom thiab muaj zog.
(3) Txhim kho qhov adhesion thiab txhim kho qhov kev hloov pauv ntawm lub hauv paus
HPMC tuaj yeem txhim kho qhov kev nplaum ntawm cov xim pleev xim uas ua los ntawm cov cement, ua rau lawv lo rau ntawm qhov chaw zoo dua thiab txo cov teeb meem xws li tev tawm thiab khoob. Tsis tas li ntawd, nws tuaj yeem txhim kho qhov kev hloov pauv ntawm cov xim pleev xim rau ntau yam substrates, thiab tuaj yeem muab kev nplaum zoo txawm tias ntawm cov pob zeb ua vaj tse, masonry lossis mortar bases.
(4) Cuam tshuam rau lub sijhawm ua haujlwm tsim kho
Qhov ntxiv ntawm HPMC tuaj yeem ncua lub sijhawm teeb tsa ntawm cov txheej txheem tiv thaiv dej uas ua los ntawm cov cement, ua rau cov neeg ua haujlwm tsim kho muaj sijhawm txaus los kho thiab kho, tshwj xeeb tshaj yog thaum tsim cov chaw loj lossis cov qauv nyuaj. Qhov no yog qhov tseem ceeb heev. Tib lub sijhawm, nws kuj tseem tuaj yeem txo cov teeb meem sib koom ua ke los ntawm kev qhuav sai ntawm cov txheej txheem thaum lub sijhawm tsim kho thiab txhim kho kev ua haujlwm tiv thaiv dej tag nrho.
(5) Txhim kho qhov ruaj khov ntawm txheej
HPMC tuaj yeem txhim kho qhov yooj ywm thiab kev tiv thaiv kev hnav ntawm cov txheej, yog li cov txheej tiv thaiv dej uas ua los ntawm cov cement tuaj yeem tswj tau qhov zoo ntawm kev tiv thaiv dej thaum siv ntev thiab tiv taus kev yaig ntawm ib puag ncig sab nraud. Piv txwv li, nws tuaj yeem txhim kho qhov kev tiv thaiv tawg thiab kev tiv thaiv khov-yaj ntawm cov txheej, thiab nws tsim nyog rau ntau qhov chaw tsim kho hnyav.
HPMCUa lub luag haujlwm tseem ceeb hauv cov txheej txheem tiv thaiv dej uas ua los ntawm cov cement. Nws tsis tsuas yog txhim kho kev ua tau zoo ntawm cov txheej thiab ua rau cov txheej sib xws thiab ruaj khov dua, tab sis kuj ua rau lub zog ntawm cov txheej thiab txhim kho qhov cuam tshuam ntawm cov dej tsis nkag. Yog li ntawd, hauv kev tsim cov tshuaj tiv thaiv dej uas ua los ntawm cov cement, kev xaiv thiab ntxiv HPMC yog qhov tseem ceeb rau kev ua kom cov khoom ua haujlwm zoo.
Lub sijhawm tshaj tawm: Plaub Hlis-04-2025