Hydroxypropyl methylcellulose (HPMC) yog ib qho tseem ceeb multifunctional chemical additive lug siv nyob rau hauv kev tsim kho thiab cov ntaub ntawv engineering teb, tshwj xeeb tshaj yog nyob rau hauv pob zeb thiab mortar. HPMC yog cov dej-soluble non-ionic cellulose ether chemically hloov los ntawm tej yam ntuj tso polymer cov ntaub ntawv (xws li ntoo pulp los yog paj rwb).
1. Thickeners thiab dej tuav cov neeg ua haujlwm
Lub luag haujlwm tseem ceeb ntawm HPMC hauv pob zeb yog ua tus neeg sawv cev thickening thiab dej tuav tus neeg sawv cev. Tom qab ntxiv HPMC rau qhov kev faib ua feem, qhov sib xws thiab viscosity ntawm cov pob zeb tuaj yeem txhim kho tau zoo. Cov yam ntxwv no ua rau HPMC txhim kho kev ua haujlwm ntawm cov pob zeb ua haujlwm zoo thiab txo qhov ntws thiab sib cais ntawm cov mortar thaum lub sijhawm tsim kho. Tsis tas li ntawd, kev tuav dej ntawm HPMC ua rau nws nyuaj rau cov dej hauv cov pob zeb kom evaporate sai, yog li ncua sij hawm pib ntawm cov pob zeb. Qhov no yog qhov tseem ceeb tshwj xeeb rau kev tsim kho nyob rau hauv qhov kub thiab txias thaum lub caij ntuj sov, vim tias nws tiv thaiv cov pob zeb ua kom qhuav thiab ua kom cov cement yog hydrated tag nrho los txhim kho cov pob zeb kawg.
2. ncua sij hawm coagulation
Kev taw qhia ntawm HPMC tuaj yeem ncua sijhawm teem sijhawm ntawm kev ua vaj tse. Qhov no feature yog tshwj xeeb tshaj yog pab tau nyob rau hauv complex kev tsim kho tej yam kev mob, xws li cov pob zeb loj pouring tej yaam num uas cov pob zeb yuav tsum tau ua nyob rau hauv lub sij hawm ntev. HPMC inhibits qhov ceev ntawm cov cement hydration cov tshuaj tiv thaiv los ntawm kev tsim cov yeeb yaj kiab adsorption ntawm cov cement hais, yog li ua kom lub sijhawm teem sijhawm ntawm pob zeb. Qhov no muab cov neeg ua haujlwm tsim kho nrog sijhawm ntxiv rau kev hloov kho thiab txiav kom ntseeg tau tias kev tsim kho zoo.
3. Anti-cracking kev ua tau zoo
Kev tawg pob zeb yog ib qho teeb meem tshwm sim hauv kev tsim kho vaj tsev, thiab HPMC ua tau zoo hauv kev txhim kho pob zeb ua rau tawg. Cov dej tuav thiab cov nyhuv thickening ntawm HPMC maj mam txo cov evaporation ntawm cov dej thaum lub sij hawm hardening txheej txheem ntawm cov pob zeb, tsis txhob shrinkage thiab cracking los ntawm noo noo imbalance. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem ua kom cov qauv elastic ntawm cov pob zeb ua kom cov pob zeb ua kom tawv tawv dua thaum muaj kev ntxhov siab, yog li txo qhov kev pheej hmoo ntawm kev tawg.
4. Txhim kho impermeability
Cov khoom impermeability ntawm pob zeb yog qhov tseem ceeb rau kev ua haujlwm ntev ntawm cov tsev. HPMC tuaj yeem txhim kho impermeability ntawm pob zeb los ntawm nws txoj haujlwm ntawm khaws cov dej thiab txhim kho qhov pore qauv ntawm pob zeb. Lub network qauv tsim los ntawm HPMC hauv cov pob zeb ua tau zoo tuaj yeem sau cov pores me me hauv cov pob zeb, yog li txo qhov nkag mus ntawm cov dej noo thiab lwm yam corrosive. Qhov no muaj txiaj ntsig zoo rau kev txhim kho lub zog ntawm cov pob zeb ua vaj tse uas yuav tsum tau muaj kev tsis sib haum xeeb, xws li cov qauv hauv av thiab cov dej tso dej.
5. Txhim kho kev tsim kho kev ua haujlwm
Lwm lub luag haujlwm tseem ceeb ntawm HPMC yog txhawm rau txhim kho kev tsim kho ntawm pob zeb. Txij li thaum HPMC nce viscosity thiab rheology ntawm cov pob zeb, qhov fluidity thiab adhesion ntawm cov pob zeb thaum lub sij hawm tsim kho tau zoo dua. Qhov no tsis tsuas yog txo qhov poob ntawm cov ntaub ntawv thaum lub sij hawm tsim kho, tab sis kuj txhim kho qhov raug thiab efficiency ntawm kev tsim kho. Piv txwv li, ntxiv HPMC rau txhaj tshuaj tiv thaiv tuaj yeem txo qhov rov qab poob ntawm cov pob zeb, ua kom cov tuab ntawm kev tsim kho, thiab ua rau kev tsim kho nto smoother thiab flatter.
6. Txhim kho thermal rwb thaiv tsev kev ua haujlwm
Hauv qee hom pob zeb, HPMC kuj tseem siv los txhim kho cov thermal rwb thaiv tsev ntawm cov khoom. Kev taw qhia ntawm HPMC tuaj yeem tsim muaj ntau cov npuas me me hauv cov pob zeb, uas pab txo cov cua sov thiab ua kom cov thermal rwb thaiv tsev ua haujlwm ntawm cov pob zeb. Qhov no muaj txiaj ntsig tseem ceeb hauv qee lub tsev tshwj xeeb xws li cia txias, thermal rwb thaiv tsev phab ntsa, thiab lwm yam.
7. Txo kev sib cais thiab los ntshav
Kev sib cais thiab los ntshav yog cov teeb meem tshwm sim hauv pob zeb, tshwj xeeb tshaj yog nyob rau hauv high-flow pob zeb. Los ntawm kev nce qhov sib xws ntawm cov pob zeb, HPMC tuaj yeem tiv thaiv kev sib cais ntawm cov pob zeb sib xyaw thiab txo cov dej los ntshav hauv pob zeb. Qhov no tsis tsuas yog txhim kho qhov zoo ntawm cov pob zeb, tab sis kuj ua kom nws homogeneity, yog li ua kom nws lub zog thiab kav ntev.
8. Txhim kho adhesion
Rau qee cov pob zeb uas yuav tsum tau sib txuas nrog lwm cov ntaub ntawv, xws li pobzeb nplaum lossis kho cov mortar, HPMC tuaj yeem txhim kho nws cov adhesion. Los ntawm kev ua kom cov viscosity thiab yooj yooj yim ntawm cov pob zeb, HPMC ua kom cov pob zeb ua kom zoo dua nrog cov txheej txheem los yog lwm yam ntaub ntawv thiab tiv thaiv kom tsis txhob tawg thiab poob. Qhov no feature yog dav siv nyob rau hauv sab nrauv phab ntsa rwb thaiv tsev systems, pobzeb nteg thiab pob zeb kho.
Raws li cov tshuaj muaj zog ntxiv, HPMC muaj ntau yam zoo thaum siv hauv pob zeb. Nws tsis tsuas yog txhim kho kev ua haujlwm ntawm pob zeb, txuas ntxiv lub sijhawm ua haujlwm, txhim khu kev tiv thaiv kev tawg thiab impermeability, tab sis kuj ua rau kom tag nrho cov kav ntev thiab kev pabcuam lub neej ntawm pob zeb. Hauv kev tsim kho niaj hnub no, HPMC tau dhau los ua cov khoom tseem ceeb thiab tseem ceeb. Nyob rau hauv lub neej yav tom ntej, nrog kev txhim kho txuas ntxiv thiab kev tsim kho tshiab ntawm kev tsim kho thev naus laus zis, HPMC daim ntawv thov kev cia siab hauv kev ua vaj tse yuav dav dua, thiab nws yuav tsum ua lub luag haujlwm ntau dua hauv cov khoom siv tshiab thiab vaj tsev ntsuab.
Post lub sij hawm: Aug-16-2024