Cov khoom sib xyaw ntub dej: cov tshuaj sib tov sib xyaw yog ib hom cement, nplua aggregate, admixture thiab dej, thiab raws li cov khoom ntawm ntau yam khoom, raws li ib qho piv txwv, tom qab ntsuas ntawm qhov chaw sib tov, sib tov, thauj mus rau qhov chaw nyob qhov twg. tsheb thauj khoom yog siv, thiab nkag mus rau hauv ib qho tshwj xeeb Khaws lub thawv thiab siv cov khoom ntub dej tiav rau lub sijhawm teev tseg.
Hydroxypropyl methylcellulose yog siv los ua tus neeg saib xyuas dej rau cov cement mortar thiab retarder rau mortar siv. Nyob rau hauv cov ntaub ntawv ntawm gypsum raws li ib tug binder los txhim kho daim ntawv thov thiab ncua sij hawm ua hauj lwm, cov dej tuav ntawm HPMC tiv thaiv cov slurry ntawm tawg sai heev tom qab ziab, thiab txhim kho lub zog tom qab hardening. Kev tuav dej yog ib qho cuab yeej tseem ceeb ntawm hydroxypropyl methylcellulose HPMC, thiab nws kuj yog ib qho kev txhawj xeeb ntawm ntau lub tuam txhab hauv tsev ntub-tshuaj khib nyiab. Cov yam ntxwv cuam tshuam rau cov dej tuav cov nyhuv ntawm cov khib nyiab ntub dej muaj xws li HPMC ntxiv, qhov viscosity ntawm HPMC, qhov zoo ntawm cov khoom thiab qhov kub ntawm qhov chaw siv.
Muaj peb lub luag haujlwm tseem ceeb ntawm hydroxypropyl methylcellulose HPMC hauv cov khoom ntub dej sib xyaw, ib qho yog cov dej tuav tau zoo, lwm qhov yog kev cuam tshuam ntawm qhov sib xws thiab thixotropy ntawm ntub-sib tov mortar, thiab qhov thib peb yog kev sib cuam tshuam nrog cov cement. Kev tuav dej ntawm cellulose ether nyob ntawm qhov nqus dej ntawm lub hauv paus, qhov sib xyaw ntawm cov mortar, lub thickness ntawm cov mortar txheej, cov dej xav tau ntawm cov mortar, thiab lub sijhawm teem sijhawm. 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, qhov loj me thiab qhov kub thiab txias. Qhov ntau dua qhov viscosity ntawm cellulose ether, qhov dej tuav tau zoo dua. Viscosity yog ib qho tseem ceeb parameter ntawm HPMC kev ua tau zoo. Rau tib yam khoom, cov txiaj ntsig ntawm kev siv ntau txoj hauv kev los ntsuas viscosity sib txawv heev, thiab qee qhov txawm tias muaj qhov sib txawv ntawm ob. Yog li ntawd, kev sib piv ntawm viscosity yuav tsum tau ua nyob rau hauv tib txoj kev sim, xws li kub, spindle, thiab lwm yam.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov dej tuav tau zoo dua. Txawm li cas los xij, qhov siab dua qhov viscosity, qhov hnyav molecular ntawm HPMC ntau dua thiab qis dua qhov solubility ntawm HPMC, uas muaj kev cuam tshuam tsis zoo rau lub zog thiab kev tsim kho ntawm mortar. Qhov siab dua qhov viscosity, qhov pom tseeb dua cov nyhuv ntawm cov tshuaj khib nyiab, tab sis nws tsis cuam tshuam ncaj qha. Qhov siab dua qhov viscosity, qhov viscous ntub dej ntau dua, qhov kev tsim kho zoo dua, kev ua haujlwm ntawm cov kua nplaum nplaum thiab qhov siab dua qhov adhesion rau lub substrate. Txawm li cas los xij, qhov muaj zog ntxiv ntawm cov mortar ntub nws tus kheej tsis pab. Ob qho kev tsim kho tsis muaj qhov pom tseeb los tiv thaiv kev ua haujlwm. Hauv qhov sib piv, qee qhov nruab nrab thiab qis viscosity tab sis hloov kho hydroxypropyl methylcellulose muaj kev ua tau zoo hauv kev txhim kho lub zog ntawm cov khoom ntub dej.
Qhov ntau dua ntawm cov cellulose ether ntxiv rau PMC ntub mortar, qhov dej tuav tau zoo dua, thiab qhov viscosity siab dua, cov dej tuav tau zoo dua. Fineness kuj yog ib qho tseem ceeb qhia txog kev ua tau zoo ntawm hydroxypropyl methylcellulose.
Qhov zoo ntawm hydroxypropyl methylcellulose kuj muaj qee yam cuam tshuam rau nws cov dej tuav. Feem ntau, rau hydroxypropyl methylcellulose nrog tib viscosity thiab sib txawv fineness, qhov me dua qhov fineness, me me cov dej tuav nyhuv nyob rau hauv tib qhov sib ntxiv. zoo dua.
Hauv cov khib nyiab ntub dej, qhov sib ntxiv ntawm cellulose ether HPMC yog tsawg heev, tab sis nws tuaj yeem txhim kho kev tsim kho ntawm cov khib nyiab ntub dej, thiab nws yog cov khoom siv tseem ceeb uas feem ntau cuam tshuam rau kev ua haujlwm ntawm mortar. Kev xaiv tsim nyog ntawm hydroxypropyl methylcellulose, kev ua haujlwm ntawm cov khib nyiab ntub tau cuam tshuam zoo heev.
Post lub sij hawm: Apr-25-2023