HydroxyPropyyl Metylcellulose (HPMC), raws li dej-soluble polymer compound, yog siv dav hauv kev txhim kho ntawm cov khoom siv Maas-raws. Raws li ib qho tseem ceeb ntxiv, nws tuaj yeem txhim kho lub cev thiab tshuaj lom neeg ntawm cov cai ua ke, tshwj xeeb tshaj yog cov kev ua haujlwm, kev ua kom zoo nkauj thiab durability ntawm kev siv nyiaj.
1. Txhim kho cov kua dej ntawm cov khoom noj yog cov khoom siv
Cov tshuaj txhuam siab xav tau cov tshuaj ntsuab zoo thaum tsim kho kom nws tuaj yeem raug hliv rau hauv cov pwm thiab sau cov duab nyuaj. Tom qab ntxiv hydroxypropyl methylcellulose, cov cement muab tshuaj txhuam tuaj yeem ua kom muaj fickenity zoo heev. Thaum siv, HPMC tuaj yeem txhim kho cov fluidity los ntawm kev hloov lub paste, kom cov paste tau ua haujlwm ntev dua, uas yooj yim rau cov neeg tsim kho kom ua haujlwm rau cov khoom siv.
2. Txhim kho cov nplaum ntawm cov khoom noj qabent-based
Cov nplaum ntawm cov ntxhib-based cov ntaub ntawv yog qhov tseem ceeb rau nws cov kev txhim kho durability thiab kev ua tau zoo. HPMC yog dej-soluble polymer compound nrog cov pawg hydrophilic nyob rau hauv nws cov qauv molech, uas ua rau muaj cov qauv molecular, uas ua rau kom muaj kev sib tshuam thiab lwm cov tub lim rau cov qauv siv network ruaj khov. Cov nyhuv no tsis tuaj yeem txhim kho txoj kev sib raug zoo ntawm Caas thiab substrate, tab sis kuj txhim kho cov khoom tawg thiab tev cov khoom siv thiab txhim kho lawv cov kev ua haujlwm. Cov kev tshawb fawb tau qhia tias cov ntaub ntawv tso cai ua ke nrog kev sib txuas ntawm HPMC tuaj yeem txo cov kev tawg, yog li deb ntawm kev pabcuam lub neej ntawm cov khoom.
3. Txhim kho qhov tsis muaj tseeb ntawm cov ntaub ntawv cas-basent
Lub impermeability ntawm cov khoom siv Maa-raws li ib qho ntawm cov ntsuas tseem ceeb cuam tshuam rau lawv cov kav ntev. Cov lus qhia ntawm HPMC tuaj yeem txhim kho cov microstructure ntawm cov caas-based cov ntaub ntawv, sib sau cov qauv siv ntom nti network, yog li txo qhov porosity hauv cov cement muab tshuaj txhuam. Qhov txo qis hauv cov porosity ncaj qha txhim kho cov impermabeability ntawm cov khoom noj qabent-raws li cov ntaub ntawv. Cov kev tshawb fawb pom tau tias ntxiv tus nqi ntawm HPMC tsim nyog tuaj yeem ua rau lawv muaj kuab, txo qis lawv cov dej permeability, thiab yog li txhim kho kev ua haujlwm tsis muaj dej ntawm cov tuam tsev.
4. Kev ncua cov txheej txheem ntawm cov dej khov ntawm cov xis
Cov txheej txheem hydration ntawm cov cement yog cov txheej txheem kev ua haujlwm nyuaj. Hauv kev tsim khoom thiab kev tsim kho cov ntawv tso cai, cov nqi ntawm cov tshuaj tiv thaiv kev co tau muaj qhov cuam tshuam ncaj qha rau kev ua tau zoo kawg nkaus. Qhov kev sib txuas ntawm HPMC tuaj yeem ncua cov txheej txheem hydration ntawm cov cement los ntawm kev hloov pauv viscosity ntawm cov cement muab tshuaj txhuam. HPMC muaj peev xwm txuas lub sijhawm ua haujlwm thiab tiv thaiv cov cement muab los ntawm kev ua kom sai dhau. Cov yam ntxwv no tshwj xeeb yog tsim nyog rau cov ntaub ntawv tso cai ua ke uas xav tau kev ua haujlwm ntev, uas tuaj yeem txhim kho qhov hloov pauv thiab cov khoom siv ua haujlwm.
5. Txhim Kho Lub Freeze-Thaw Ua Phem ntawm Cov Khoom Siv Caas
Hauv cov chaw dej txias, cov ntaub ntawv tso cai yog nthuav tawm kom khov-lub voj voog, uas tuaj yeem ua rau txo qis hauv lub zog ntawm cov ntaub ntawv thiab kev ua kom raug. Qhov kev sib txuas ntawm HPMC rau cov khoom siv ua kom xis mas pab txhim kho lawv khov-thaws tsis kam. Los ntawm kev txo qhov hws hauv cov khoom siv casent, HPMC tuaj yeem txo cov khoom siv hluav taws xob kom txo tau cov khoom khov Cov kev tshawb fawb tau pom tias thaum HPMC ntxiv yog tsim nyog, cov khoom khov-based tsis zoo, tshwj xeeb yog txhim kho cov vaj tse nyob hauv thaj chaw huab cua.
6. Txhim kho qhov kub siab tsis kam ntawm cov ntaub ntawv caas-raws li cov ntaub ntawv
Thaum cov ntaub ntawv tso cai; siv nyob rau hauv ib puag ncig kub thiab cua sov li thermal expansion thiab condaction, thiab txo cov zog lub cev. Qhov kev sib txuas ntawm HPMC tuaj yeem txhim kho qhov kub siab tsis kam ntawm cov khoom siv Maas-raws. Txij li thaum HPMC muaj qhov zoo thermal stability, nws tuaj yeem tswj hwm nws cov khoom siv lub cev ntawm lub zog thiab cov khoom siv kom ntev ntawm cov khoom siv khov kho.
7. Txhim kho kev tsim kho kev tsim kho
Kev tsim kho kev tsim kho yog ib qho tseem ceeb ntawm kev ntsuas qhov ua tau zoo ntawm cov khoom noj kom zoo. HPMC tuaj yeem txhim kho qhov kev ua haujlwm ntawm cov khoom siv Maas-based thiab tiv thaiv cov teeb meem xws li kev cais thiab dej SHRPAGE thaum kev tsim kho. Thaum ua ntawv thov, plastering lossis hliv cov khoom noj ua ke, kom cov khoom siv qhib tau zoo dua, kom muaj teeb meem ntau dua, txo cov teeb meem tsis sib xws, txo cov teeb meem tsis sib xws thaum tsim kho.
Raws li qhov tseem ceeb ntxiv rau cov ntaub ntawv tso cai, hydroxypropyl methylcellulose tuaj yeem txhim kho ntau yam khoom. HPMC qhia tau zoo heev hauv daim ntawv thov cov khoom siv Maas-basing, tshwj xeeb yog ncua kev txhim kho kev ua haujlwm thiab ruaj khov. Yog li ntawd, hauv txoj haujlwm tsim kho niaj hnub, kev siv ntawm hydroxypropylulose muaj lub luag haujlwm dav dav thiab ua lub luag haujlwm zoo hauv kev txhim kho cov ntaub ntawv tsim kho tsev.
Lub Sijhawm Post: Feb-19-2025