Cov khoom sib xyaw ntub dej yog cov cement, nplua aggregate, admixture, dej thiab ntau yam khoom txiav txim siab raws li kev ua tau zoo.Raws li ib qho kev faib ua feem, tom qab tau ntsuas thiab sib xyaw hauv qhov chaw sib xyaw, nws raug thauj mus rau qhov chaw siv los ntawm lub tsheb sib tov, thiab muab tso rau hauv ib qho tshwj xeeb Cov khoom ntub dej yog khaws cia rau hauv lub thawv thiab siv nyob rau hauv lub sijhawm teev.
Hydroxypropyl methylcellulose yog siv los ua tus neeg saib xyuas dej thiab rov qab ntawm cov cement mortar kom cov mortar tuaj yeem siv tau.Siv los ua cov ntawv khi rau hauv plastering plaster, nws txhim kho kev sib kis thiab ua kom lub sijhawm ua haujlwm ntev.Cov dej tuav kev ua tau zoo ntawm hydroxypropyl methylcellulose HPMC tiv thaiv cov slurry los ntawm kev tawg vim ziab sai heev tom qab thov, thiab txhim kho lub zog tom qab hardening.Kev tuav dej yog ib qho tseem ceeb ntawm kev ua haujlwm ntawm hydroxypropyl methylcellulose HPMC, thiab nws kuj yog ib qho kev ua tau zoo uas ntau cov tuam txhab ntub dej sib xyaw hauv tsev tau saib xyuas.Cov yam tseem ceeb uas cuam tshuam rau cov dej tuav cov nyhuv ntawm cov dej ntub dej sib xyaw muaj xws li HPMC ntxiv, qhov viscosity ntawm HPMC, qhov zoo ntawm cov khoom, thiab qhov kub ntawm qhov chaw siv.
Lub luag haujlwm tseem ceeb ntawm hydroxypropyl methylcellulose HPMC nyob rau hauv ntub-sib tov mortar feem ntau muaj peb yam, ib qho yog cov dej tuav tau zoo, lwm qhov yog kev cuam tshuam ntawm kev sib xws thiab thixotropy ntawm ntub-sib tov mortar, thiab qhov thib peb yog kev sib cuam tshuam nrog cov cement.Cov dej tuav cov nyhuv ntawm cellulose ether nyob ntawm qhov nqus dej ntawm lub hauv paus txheej, muaj pes tsawg leeg ntawm mortar, lub thickness ntawm lub mortar txheej, cov dej xav tau ntawm cov mortar, thiab lub sij hawm teem ntawm cov khoom siv.Qhov siab dua qhov pom ntawm hydroxypropyl methylcellulose, qhov dej tuav tau zoo dua.
Cov yam ntxwv cuam tshuam rau cov dej khaws cia ntawm cov khib nyiab ntub dej muaj xws li cellulose ether viscosity, ntxiv tus nqi, particle fineness thiab siv kub.Qhov ntau dua qhov viscosity ntawm cellulose ether, qhov dej tuav tau zoo dua.Viscosity yog qhov tseem ceeb ntawm HPMC kev ua haujlwm.Rau tib yam khoom, cov txiaj ntsig viscosity ntsuas los ntawm ntau txoj kev sib txawv heev, thiab qee qhov txawm tias muaj qhov sib txawv ob npaug.Yog li ntawd, thaum sib piv viscosity, nws yuav tsum tau nqa tawm ntawm tib txoj kev sim, xws li kub, rotor, thiab lwm yam.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua cov dej tuav.Txawm li cas los xij, qhov siab dua qhov viscosity thiab siab dua qhov hnyav molecular ntawm HPMC, qhov sib piv ntawm nws cov solubility yuav muaj kev cuam tshuam tsis zoo rau lub zog thiab kev tsim kho ntawm cov mortar.Qhov siab dua qhov viscosity, qhov pom tseeb dua cov nyhuv thickening ntawm mortar, tab sis nws tsis ncaj qha proportional.Qhov siab dua qhov viscosity, qhov viscous ntau dua cov mortar ntub yuav, uas yog, thaum lub sij hawm tsim kho, nws yog manifested li sticking rau scraper thiab siab adhesion rau lub substrate.Tab sis nws tsis muaj txiaj ntsig los ua kom lub zog muaj zog ntawm cov mortar ntub nws tus kheej.Thaum lub sij hawm tsim kho, qhov kev ua tau zoo anti-sag tsis pom tseeb.Ntawm qhov tsis sib xws, qee qhov hloov kho hydroxypropyl methylcellulose nrog nruab nrab thiab qis viscosity muaj kev ua tau zoo hauv kev txhim kho lub zog ntawm cov khoom ntub dej.
Qhov ntau dua ntawm cov cellulose ether HPMC ntxiv rau hauv cov khoom ntub dej sib xyaw, qhov dej tuav tau zoo dua, thiab qhov viscosity siab dua, qhov dej tuav tau zoo dua.Fineness kuj yog ib qho tseem ceeb Performance index ntawm hydroxypropyl methylcellulose.
Qhov zoo ntawm hydroxypropyl methylcellulose kuj muaj qee yam cuam tshuam rau nws cov dej tuav.Feem ntau hais lus, rau hydroxypropyl methylcellulose nrog tib viscosity tab sis txawv fineness, lub finer lub finer lub finer Cov dej tuav nyhuv yog zoo dua.
Hauv cov khib nyiab ntub dej, qhov sib ntxiv ntawm cellulose ether HPMC yog qhov tsawg heev, tab sis nws tuaj yeem txhim kho kev tsim kho ntawm cov khoom sib xyaw ntub dej, thiab nws yog ib qho tseem ceeb ntxiv uas cuam tshuam rau kev tsim kho ntawm mortar.Kev xaiv tsim nyog ntawm qhov tseeb hydroxypropyl methylcellulose muaj kev cuam tshuam zoo rau kev txhim kho kev ua haujlwm ntawm cov khoom ntub dej sib xyaw.
Post lub sij hawm: Mar-31-2023