Hydroxypropyl Methyl Cellulose (HPMC)yog ib qho tseem ceeb ntawm cellulose ether, uas yog dav siv nyob rau hauv lub tsev cov ntaub ntawv, tshwj xeeb tshaj yog nyob rau hauv mortar raws li ib tug dej retainer thiab thickener. Cov dej tuav ntawm HPMC hauv mortar ncaj qha cuam tshuam rau kev tsim kho kev ua haujlwm, kev ua haujlwm ntev, kev txhim kho lub zog thiab huab cua tsis kam ntawm mortar, yog li nws daim ntawv thov ua lub luag haujlwm tseem ceeb hauv kev tsim kho cov haujlwm zoo.
1. Cov kev cai tswj dej thiab kev cuam tshuam hauv mortar
mortar yog cov khoom siv nplaum uas feem ntau siv rau hauv kev tsim kho, feem ntau yog siv los ua cov masonry, plastering, kho, thiab lwm yam. Thaum lub sij hawm tsim kho, cov mortar yuav tsum muaj qee qhov dej noo kom ntseeg tau tias kev ua haujlwm zoo thiab adhesion. evaporation sai ntawm cov dej nyob rau hauv mortar los yog poob dej loj yuav ua rau cov teeb meem hauv qab no:
Txo lub zog: Kev poob dej yuav ua rau cov cement hydration tsis txaus, yog li cuam tshuam rau kev txhim kho lub zog ntawm mortar.
Kev sib txuas tsis txaus: Kev poob dej yuav ua rau muaj kev sib txuas tsis txaus ntawm cov mortar thiab substrate, cuam tshuam rau kev ruaj ntseg ntawm lub tsev.
Qhuav cracking thiab hollowing: Tsis sib npaug ntawm cov dej tuaj yeem ua rau shrinkage thiab cracking ntawm cov mortar txheej, cuam tshuam rau cov tsos thiab kev pab cuam lub neej.
Yog li ntawd, lub mortar xav tau ib tug muaj zog tuav lub peev xwm thaum lub sij hawm tsim kho thiab solidification, thiab HPMC tuaj yeem txhim kho cov dej tuav ntawm lub mortar, txhim kho kev tsim kho thiab kev ua tiav ntawm cov khoom tiav.
2. Dej tuav mechanism ntawm HPMC
HPMC muaj cov dej tuav ruaj khov heev, feem ntau yog vim nws cov qauv molecular thiab tshwj xeeb kev ua haujlwm hauv mortar:
Kev nqus dej thiab nthuav dav: Muaj ntau pawg hydroxyl hauv cov qauv molecular ntawm HPMC, uas tuaj yeem tsim cov hydrogen bonds nrog dej molecules, ua rau nws nqus dej heev. Tom qab ntxiv dej, HPMC molecules tuaj yeem nqus dej ntau thiab nthuav dav los tsim cov txheej txheem gel, yog li ncua sijhawm evaporation thiab poob dej.
Cov yam ntxwv tsim cov yeeb yaj kiab: HPMC yaj hauv dej los tsim cov kua nplaum siab, uas tuaj yeem tsim cov yeeb yaj kiab tiv thaiv ib puag ncig cov khoom khib nyiab. Cov yeeb yaj kiab tiv thaiv no tuaj yeem tsis tsuas yog kaw cov dej noo, tab sis kuj txo cov kev tsiv teb tsaws ntawm cov dej noo mus rau lub substrate, yog li txhim kho cov dej tuav ntawm cov mortar.
Thickening nyhuv: Tom qab HPMC yaj nyob rau hauv dej, nws yuav ua rau kom cov viscosity ntawm cov mortar, uas yuav pab kom tusyees faib thiab khaws cov dej thiab tiv thaiv dej los ntawm seeping los yog poob sai heev. Cov nyhuv thickening tuaj yeem txhim kho kev ua haujlwm ntawm cov tshuaj khib thiab txhim kho nws cov kev ua haujlwm los tiv thaiv sagging.
3. HPMC dej tuav txhim kho kev ua haujlwm ntawm mortar
HPMC txhim kho cov dej tuav ntawm mortar, uas tsis ncaj qha cuam tshuam rau nws lub cev thiab tshuaj lom neeg. Nws yog tshwj xeeb manifested nyob rau hauv cov nram qab no yam:
3.1 Txhim kho kev ua haujlwm ntawm mortar
Kev ua haujlwm zoo tuaj yeem ua kom muaj kev sib haum xeeb ntawm kev tsim kho. HPMC ua rau kom cov viscosity thiab dej tuav ntawm mortar, kom cov mortar tseem moist thaum lub sij hawm tsim kho, thiab tsis yooj yim rau stratify thiab precipitate dej, yog li ntawd zoo heev txhim kho lub operability ntawm kev tsim kho.
3.2 Ntev lub sijhawm qhib
Kev txhim kho ntawm HPMC cov dej tuav tuaj yeem ua kom cov mortar ntub dej rau lub sijhawm ntev, ua kom lub sijhawm qhib, thiab txo qhov tshwm sim ntawm cov tshuaj khib nyiab vim dej sai sai thaum tsim kho. Qhov no muab cov neeg ua haujlwm tsim kho nrog lub sijhawm hloov kho ntev dua thiab pab txhim kho kev tsim kho kom zoo.
3.3 Txhim khu kev sib raug zoo ntawm mortar
Lub zog ntawm mortar yog ze ze rau cov tshuaj tiv thaiv hydration ntawm cement. Cov dej tuav tau muab los ntawm HPMC kom ntseeg tau tias cov cement hais tuaj yeem ua kom muaj dej txaus, tsis txhob muaj kev sib txuas tsis txaus los ntawm kev poob dej thaum ntxov, yog li txhim kho cov txiaj ntsig zoo ntawm cov mortar thiab cov substrate.
3.4 Txo shrinkage thiab tawg
HPMC muaj cov dej tuav tau zoo heev, uas tuaj yeem txo qhov poob dej sai sai, yog li zam kom tsis txhob muaj qhov shrinkage thiab shrinkage cracking tshwm sim los ntawm dej poob thaum lub sij hawm txheej txheem ntawm lub mortar, thiab txhim kho cov tsos thiab durability ntawm mortar.
3.5 Txhim kho qhov khov-thaw tsis kam ntawm mortar
Kev ruaj ntseg ntawm cov dejHPMCua rau cov dej hauv cov tshuaj khib nyiab sib npaug, uas yuav pab txhim kho qhov ntom ntom thiab uniformity ntawm mortar. Cov qauv zoo li no tuaj yeem tiv taus qhov kev puas tsuaj los ntawm khov-thaw cycles nyob rau hauv cov huab cua txias thiab txhim kho lub durability ntawm mortar.
4. Kev sib raug zoo ntawm tus nqi ntawm HPMC thiab cov nyhuv tuav dej
Tus nqi ntawm HPMC ntxiv yog qhov tseem ceeb rau kev tuav dej ntawm cov tshuaj khib nyiab. Feem ntau hais lus, ntxiv qhov tsim nyog ntawm HPMC tuaj yeem txhim kho cov dej khaws cia ntawm cov mortar, tab sis yog tias ntxiv ntau dhau, nws yuav ua rau cov mortar hnyav dhau, cuam tshuam rau kev tsim kho thiab lub zog tom qab hardening. Yog li ntawd, nyob rau hauv kev siv tswv yim, tus nqi ntawm HPMC yuav tsum tau tswj kom tsim nyog raws li cov qauv tshwj xeeb thiab kev tsim kho ntawm cov mortar kom ua tiav cov dej tuav tau zoo tshaj plaws.
Raws li ib qho tseem ceeb ntawm cov dej tuav cov neeg sawv cev thiab cov thickener, HPMC plays lub luag haujlwm hloov tsis tau hauv kev txhim kho cov dej tuav ntawm mortar. Nws tuaj yeem tsis tsuas yog txhim kho kev ua haujlwm thiab kev tsim kho ntawm mortar, tab sis kuj tseem ua kom lub sijhawm qhib, txhim kho lub zog sib txuas, txo qis shrinkage cracking, thiab txhim kho lub durability thiab khov-thaw kuj ntawm mortar. Hauv kev tsim kho niaj hnub no, kev siv tsim nyog ntawm HPMC tuaj yeem tsis tsuas yog daws tau qhov teeb meem ntawm cov dej khib nyiab, tab sis kuj ua kom zoo ntawm qhov project thiab txuas lub neej kev pab cuam ntawm lub tsev.
Post lub sij hawm: Nov-12-2024