Hydroxypropyl Methylcellulose (HPMC) yog ib qho uas tsis yog-ionic cellulose ether siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv kev hloov kho ntawm pob zeb thiab mortar. Nws cov khoom tseem ceeb yog cov khoom tau los ntawm kev hloov kho tshuaj ntawm cellulose, uas tuaj yeem yaj hauv dej los tsim cov tshuaj colloidal. Raws li cov khoom siv ntxiv, HPMC cov khoom tshwj xeeb ntawm lub cev thiab tshuaj lom neeg ua rau muaj ntau yam kev txhim kho.
1. Txhim kho kev ua haujlwm
1.1. Nce plasticity
HPMC tsub kom cov yas thiab fluidity ntawm cov pob zeb, ua kom yooj yim rau cov duab thaum siv. Kev tuav dej ntawm HPMC tso cai rau cov pob zeb sib xyaw kom muaj lub sijhawm ua haujlwm ntev dua, yog li ua rau kom qhuav nrawm. Qhov no yog ib qho tseem ceeb tshwj xeeb tshaj yog rau cov pob zeb loj loj lossis cov haujlwm uas yuav tsum tau nchuav mus ntev, vim nws tiv thaiv qhov sib xyaw kom qhuav tawm ntxov ntxov thiab txo qhov nyuaj ntawm kev tsim kho.
1.2. Txhim kho lubricity
HPMC muaj lubricity zoo heev, uas tuaj yeem txo qhov kev sib txhuam ntawm cov pob zeb thiab cov formwork lossis lwm qhov chaw, yog li txo qhov kev tiv thaiv thaum siv. Qhov no yuav pab txo qis hnav ntawm kev tsim kho tshuab thaum txhim kho kev tsim kho.
2. Txhim kho dej tuav
2.1. Ncua dej evaporation
Cov qauv molecular ntawm HPMC tuaj yeem nqus tau cov dej ntau, yog li tsim cov dej tuav hauv lub pob zeb. Lub peev xwm khaws dej no ua haujlwm tau zoo ncua sijhawm ntawm cov dej evaporation, xyuas kom cov pob zeb khaws cov dej txaus thaum lub sijhawm ua kom tawv, thiab txhawb cov dej tshuaj tiv thaiv ntawm cov cement.
2.2. Tiv thaiv cov yas shrinkage tawg
Los ntawm kev txhim kho cov dej tuav ntawm cov pob zeb, HPMC tuaj yeem tiv thaiv cov kab nrib pleb hauv cov pob zeb kom zoo thaum ntxov. Qhov no yog qhov tseem ceeb rau kev txhim kho tag nrho lub zog thiab kav ntev ntawm cov pob zeb, tshwj xeeb tshaj yog nyob rau hauv qhov chaw kub thiab qhuav.
3. Ua kom adhesion
3.1. Txhim kho qhov adhesion ntawm pob zeb thiab cov khoom siv ntxiv
HPMC nce qhov adhesion ntawm pob zeb thiab steel tuav lossis lwm yam khoom siv ntxiv. Qhov kev txhim kho adhesion no ua kom muaj kev sib txuas zoo ntawm cov pob zeb thiab cov khoom siv ntxiv, uas pab txhim kho tag nrho lub zog thiab ruaj khov ntawm cov qauv.
3.2. Txhim kho txheej adhesion
Hauv kev siv tshuaj tsuag lossis plastering, HPMC tuaj yeem txhim kho qhov adhesion ntawm pob zeb nto, yog li ua kom ntseeg tau tias ntau yam txheej txheej lossis cov khoom tiav tuaj yeem ua raws li cov pob zeb ua kom zoo dua. Qhov no yog qhov tseem ceeb heev rau kev kho sab nrauv ntawm cov tsev thiab kev ua haujlwm ntawm cov txheej txheem tiv thaiv.
4. Txhim kho hnav tsis kam thiab corrosion kuj
4.1. Txhim khu kev hnav tsis kam
Kev siv HPMC tuaj yeem txhim kho qhov hnav tsis kam ntawm cov pob zeb thiab txo qhov muaj peev xwm ntawm qhov hnav. Qhov no yog qhov tseem ceeb heev rau cov chaw xws li hauv av lossis txoj kev uas yuav tsum tau tiv thaiv kev siv tshuab tsis tu ncua.
4.2. Txhim kho corrosion kuj
Los ntawm kev txhim kho cov compactness thiab dej tuav ntawm cov pob zeb, HPMC kuj tseem tuaj yeem tiv thaiv kev nkag mus ntawm cov khoom tsis zoo, yog li txhim kho corrosion kuj ntawm pob zeb. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig uas muaj cov tshuaj chloride ions lossis lwm yam tshuaj corrosive, HPMC tuaj yeem ua tau zoo rau kev pab cuam lub neej ntawm pob zeb.
5. Txhim kho kev tsim kho kev ua haujlwm
5.1. Ua kom lub twj tso kua mis
HPMC txhim kho lub twj tso kua mis ntawm cov pob zeb, ua kom nws smoother thaum lub sij hawm thauj mus los. Qhov kev hloov kho no tso cai rau cov pob zeb ua kom cov twj tso kua mis ntev ntev yam tsis muaj kev txo lub zog, uas yog qhov tshwj xeeb tshaj yog rau kev tsim cov tsev siab lossis cov qauv loj.
5.2. Txo kev sib cais thiab los ntshav
HPMC tuaj yeem txo qis kev sib cais thiab los ntshav hauv cov pob zeb, kom ntseeg tau tias muaj kev sib haum xeeb thaum thauj thiab nchuav. Qhov no pab txhim kho qhov zoo thiab sib xws ntawm cov qauv zaum kawg thiab tiv thaiv cov txheej txheem tsis sib xws tom qab cov pob zeb ua kom tawv.
6. Txhim kho lub zog
6.1. Txhim khu lub zog thaum ntxov
Kev siv HPMC tuaj yeem ua kom cov dej ntws tawm ntawm cov cement, yog li txhim kho lub zog thaum ntxov ntawm pob zeb. Qhov no yog ib qho tseem ceeb heev rau engineering tej yaam num uas yuav tsum tau tsim thiab muab tso rau hauv sai sai.
6.2. Txhim kho lub zog mus ntev
Txij li thaum HPMC txhim kho qhov compactness thiab tawg tsis kam ntawm cov pob zeb, nws tseem tuaj yeem tuav lub zog ntawm cov pob zeb hauv lub sijhawm ntev, ua kom lub zog thiab ruaj khov ntawm lub tsev.
7. Ib puag ncig zoo
7.1. Txo kev siv cov cement
Los ntawm kev txhim kho kev ua tau zoo ntawm pob zeb, HPMC tso cai rau kev siv cov cement kom txo qis hauv qee kis. Qhov no tsis tsuas yog pab txo cov nqi tsim kho, tab sis kuj txo cov pa roj carbon dioxide emissions thaum lub sij hawm tsim cov cement, uas yog qhov tseem ceeb rau kev tiv thaiv ib puag ncig.
7.2. Txhim kho kev siv cov khoom siv
HPMC ua kom cov pob zeb sib tov meej dua, txo cov khoom pov tseg, thiab txhim kho kev ruaj khov ntawm kev tsim kho.
Hydroxypropyl methylcellulose (HPMC) muaj cov txiaj ntsig zoo raws li cov khoom siv ntxiv. Cov txiaj ntsig no suav nrog kev txhim kho pob zeb ua haujlwm, khaws cia dej, adhesion, hnav tsis kam thiab corrosion kuj, txhim kho kev tsim kho, thiab pab txhim kho pob zeb ua kom muaj zog thiab ib puag ncig zoo. Los ntawm kev ntxiv HPMC rau pob zeb, tsis tsuas yog tuaj yeem txhim kho kev tsim kho thiab kev ua haujlwm zoo, tab sis kev pabcuam lub neej ntawm cov qauv kuj tuaj yeem txuas ntxiv, thiab kev saib xyuas thiab hloov cov nqi yuav raug txo.
Post lub sij hawm: Jun-27-2024