Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv dav siv hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog nyob rau hauv mortar. Raws li lub siab molecular compound, HPMC muaj cov yam ntxwv uas ua kom nws ua tau zoo hauv dej tuav, thickening, lubrication, stability thiab txhim kho adhesion.
(1) Cov khoom siv tshuaj thiab cov txheej txheem ntawm kev ua ntawm HPMC
HPMC yog ib qho uas tsis yog-ionic cellulose ether tau los ntawm kev hloov tshuaj lom neeg ntawm ntuj cellulose. Cov hydroxypropyl thiab methyl pawg hauv nws cov qauv molecular muab nws zoo solubility thiab viscosity. Cov khoom siv tshuaj no ua rau HPMC ua lub luag haujlwm tseem ceeb hauv qab no hauv mortar:
1.1 Kev tuav dej ua haujlwm
Kev tuav dej ntawm HPMC feem ntau yog los ntawm pawg hydrophilic hauv nws cov qauv molecular. Cov pab pawg no tuaj yeem tsim cov hydrogen bonds nrog dej molecules, yog li adsorbing thiab khaws cov dej zoo. Thaum lub sij hawm mortar siv txheej txheem, HPMC tuaj yeem txo cov evaporation ntawm cov dej, tswj cov dej noo hauv cov mortar, thiab xyuas kom meej cov hydration ntawm cov cement.
1.2 Thickening nyhuv
HPMC tseem ua lub luag haujlwm thickening hauv mortar. Cov kua nplaum uas tsim tom qab nws qhov kev sib cais tuaj yeem ua rau kom muaj qhov sib xws ntawm cov tshuaj khib, ua kom yooj yim rau kev tsim thiab tsim. Qhov no tsis tsuas yog txhim kho kev tsim kho kev ua tau zoo ntawm cov mortar, tab sis kuj txo cov sagging tshwm sim ntawm mortar ntawm ntsug nto.
1.3 Lubrication thiab stabilization nyhuv
Cov nyhuv lubrication ntawm HPMC ua rau cov mortar smoother thaum sib xyaw thiab kev tsim kho, txo qhov nyuaj ntawm kev tsim kho. Nyob rau tib lub sijhawm, HPMC muaj kev ruaj ntseg zoo, uas tuaj yeem txhim kho lub mortar lub peev xwm los tiv thaiv kev sib cais thiab ua kom muaj kev sib faib ntawm cov khoom siv khib nyiab.
(2) Kev thov tshwj xeeb ntawm HPMC hauv cov dej khib nyiab
HPMC yog dav siv nyob rau hauv ntau hom mortars, thiab nws cov dej tuav nyhuv muaj ib tug tseem ceeb pab rau kev txhim kho ntawm mortar kev ua tau zoo. Cov hauv qab no yog cov kev siv tshwj xeeb ntawm HPMC nyob rau hauv ntau yam mortars:
2.1 Ordinary cement mortar
Hauv cov cement mortar zoo tib yam, cov dej tuav cov nyhuv ntawm HPMC tuaj yeem tiv thaiv cov mortar kom tsis txhob poob dej sai heev thaum lub sij hawm tsim kho, yog li zam qhov teeb meem ntawm mortar cracking thiab lub zog poob. Tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias ib puag ncig, cov dej khaws cia ntawm HPMC yog qhov tseem ceeb tshwj xeeb.
2.2 Daim ntawv cog lus mortar
Hauv kev sib txuas mortar, cov dej tuav cov nyhuv ntawm HPMC tsis tsuas yog pab cov hydration ntawm cov cement, tab sis kuj txhim kho lub zog sib txuas ntawm mortar thiab substrate. Qhov no yog qhov tseem ceeb tshwj xeeb rau kev tsim kho ntawm cov ntaub ntawv xws li cov vuas thiab pob zeb, thiab tuaj yeem tiv thaiv qhov tshwm sim ntawm hollowing thiab ntog tawm.
2.3 Self-leveling mortar
Self-leveling mortar yuav tsum zoo fluidity thiab nws tus kheej-compacting zog. Lub thickening thiab dej tuav cov teebmeem ntawm HPMC tuaj yeem txhim kho kev tsim kho ntawm tus kheej-leveling mortar, kom ntseeg tau tias nws yuav tsis poob dej sai heev thaum lub sij hawm ntws thiab nws tus kheej-compacting txheej txheem, yog li ua kom muaj kev tsim kho zoo.
2.4 Rwb thaiv tsev mortar
Lub teeb yuag aggregates feem ntau ntxiv rau cov khoom siv rwb thaiv tsev, uas ua rau cov dej tuav pov hwm kev ua haujlwm ntawm mortar tshwj xeeb yog qhov tseem ceeb. Cov dej tuav cov nyhuv ntawm HPMC tuaj yeem ua kom ntseeg tau tias cov khoom siv rwb thaiv tsev tswj cov dej noo tsim nyog thaum lub sij hawm tsim thiab tawv, tsis txhob tawg thiab shrinkage, thiab txhim kho cov nyhuv rwb thaiv tsev thiab durability ntawm mortar.
(3) Qhov zoo ntawm HPMC hauv mortar dej tuav
3.1 Txhim kho kev tsim kho kev ua haujlwm
Cov dej tuav cov nyhuv ntawm HPMC hauv mortar tuaj yeem txhim kho kev tsim kho ntawm mortar. Nws cov thickening thiab lubricating cuam tshuam ua rau mortar yooj yim rau kev thov thiab cov duab, txo qhov nyuaj thiab kev siv zog thaum lub sij hawm tsim kho. Nyob rau tib lub sijhawm, kev tuav dej ntawm HPMC tuaj yeem txuas ntxiv lub sijhawm qhib ntawm mortar, muab cov neeg ua haujlwm tsim kho ntau lub sijhawm ua haujlwm.
3.2 Txhim kho mortar zoo
Cov dej tuav cov nyhuv ntawm HPMC pab cov tshuaj tiv thaiv dej tag nrho ntawm cov cement, yog li txhim kho lub zog thiab kav ntev ntawm cov tshuaj khib. Cov dej tuav tau zoo kuj tseem tuaj yeem tiv thaiv mortar los ntawm kev tawg thiab shrinking thaum lub sij hawm hardening txheej txheem, kom ntseeg tau qhov zoo thiab cov nyhuv ntawm kev tsim kho.
3.3 Kev txuag nqi
Daim ntawv thov ntawm HPMC tuaj yeem txo tus nqi ntawm cov cement hauv mortar, yog li txo cov nqi tsim kho. Nws cov dej tuav kev ua tau zoo ua rau cov dej hauv mortar siv tau zoo dua, txo cov dej poob thiab pov tseg. Nyob rau tib lub sijhawm, HPMC tuaj yeem txo tus nqi rov ua haujlwm ntawm mortar thaum tsim kho, ntxiv cov nqi txuag.
Qhov tseem ceeb ntawm HPMC nyob rau hauv mortar dej tuav yog nws tus kheej ua pov thawj. Nws cov khoom siv tshuaj lom neeg tshwj xeeb thiab cov txheej txheem ntawm kev ua haujlwm ua rau nws ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov dej tuav, kev tsim kho kev ua haujlwm thiab tag nrho qhov zoo ntawm mortar. Nrog rau txoj kev loj hlob ntawm kev tsim kho kev lag luam, daim ntawv thov ntawm HPMC yuav dhau los ua qhov dav thiab qhov tob, thiab txuas ntxiv mus rau kev txhim kho kev ua haujlwm thiab kev lees paub zoo ntawm mortar thiab lwm yam khoom siv.
Post lub sij hawm: Lub Xya hli ntuj-25-2024