Cov tshuaj khib ntub yog cov cement, cov pob zeb me me, cov tshuaj sib tov, dej thiab ntau yam khoom sib xyaw txiav txim siab raws li kev ua tau zoo. Raws li qee qhov sib piv, tom qab ntsuas thiab sib tov hauv qhov chaw sib tov, nws raug thauj mus rau qhov chaw siv los ntawm lub tsheb sib tov, thiab muab tso rau hauv qhov tshwj xeeb. Cov tshuaj sib tov ntub raug khaws cia rau hauv lub thawv thiab siv rau hauv lub sijhawm teev tseg.
Hydroxypropyl methylcellulose siv ua tus neeg sawv cev khaws dej thiab retarder ntawm cement mortar kom ua rau cov mortar pumpable. Siv ua tus binder hauv plastering plaster, nws txhim kho kev nthuav dav thiab ntev lub sijhawm ua haujlwm. Kev ua tau zoo ntawm hydroxypropyl methylcellulose HPMC tiv thaiv cov slurry los ntawm kev tawg vim qhuav sai dhau tom qab thov, thiab ua kom lub zog tom qab hardening. Kev khaws dej yog ib qho tseem ceeb ntawm hydroxypropyl methylcellulose HPMC, thiab nws kuj yog ib qho kev ua tau zoo uas ntau lub tuam txhab tsim cov mortar ntub dej hauv tsev tau them sai sai rau. Cov yam ntxwv cuam tshuam rau kev khaws dej ntawm cov mortar ntub dej suav nrog qhov ntau ntawm HPMC ntxiv, qhov viscosity ntawm HPMC, qhov zoo ntawm cov khoom me me, thiab qhov kub ntawm qhov chaw siv.
Lub luag haujlwm tseem ceeb ntawm hydroxypropyl methylcellulose HPMC hauv cov mortar ntub feem ntau muaj peb yam, ib qho yog lub peev xwm khaws dej zoo heev, qhov thib ob yog qhov cuam tshuam rau qhov sib xws thiab thixotropy ntawm cov mortar ntub, thiab qhov thib peb yog kev sib cuam tshuam nrog cement. Cov nyhuv khaws dej ntawm cellulose ether nyob ntawm qhov nqus dej ntawm cov txheej hauv paus, cov khoom sib xyaw ntawm cov mortar, qhov tuab ntawm cov txheej mortar, qhov xav tau dej ntawm cov mortar, thiab lub sijhawm teeb tsa ntawm cov khoom teeb tsa. Qhov siab dua qhov pom tseeb ntawm hydroxypropyl methylcellulose, qhov zoo dua qhov khaws dej.
Cov yam tseem ceeb uas cuam tshuam rau kev khaws dej ntawm cov tshuaj sib xyaw ntub suav nrog cellulose ether viscosity, qhov ntau ntxiv, qhov zoo ntawm cov khoom me me thiab kev siv kub. Qhov ntau dua qhov viscosity ntawm cellulose ether, qhov zoo dua qhov kev ua tau zoo ntawm kev khaws dej. Viscosity yog ib qho tseem ceeb ntawm HPMC kev ua tau zoo. Rau tib yam khoom, cov txiaj ntsig viscosity ntsuas los ntawm ntau txoj kev sib txawv yog txawv heev, thiab qee qhov txawm tias muaj ob npaug sib txawv. Yog li ntawd, thaum piv viscosity, nws yuav tsum tau ua tiav ntawm tib txoj kev sim, suav nrog kub, rotor, thiab lwm yam.
Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua qhov dej khaws cia nyhuv. Txawm li cas los xij, qhov siab dua qhov viscosity thiab qhov siab dua qhov hnyav molecular ntawm HPMC, qhov txo qis hauv nws cov solubility yuav muaj qhov cuam tshuam tsis zoo rau lub zog thiab kev tsim kho ntawm cov mortar. Qhov siab dua qhov viscosity, qhov pom tseeb ntau dua qhov thickening nyhuv ntawm cov mortar, tab sis nws tsis yog proportional ncaj qha. Qhov siab dua qhov viscosity, qhov ntau dua viscosity cov ntub mortar yuav yog, uas yog, thaum lub sijhawm tsim kho, nws yog manifested li lo rau ntawm scraper thiab siab adhesion rau lub substrate. Tab sis nws tsis pab kom nce lub zog ntawm cov ntub mortar nws tus kheej. Thaum lub sijhawm tsim kho, qhov kev ua tau zoo tiv thaiv-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 heev hauv kev txhim kho lub zog ntawm cov ntub mortar.
Qhov ntau dua ntawm cov cellulose ether HPMC ntxiv rau hauv cov mortar ntub-mixed, qhov zoo dua qhov kev ua tau zoo ntawm kev khaws dej, thiab qhov siab dua qhov viscosity, qhov zoo dua qhov kev ua tau zoo ntawm kev khaws dej. Fineness kuj yog ib qho tseem ceeb ntawm kev ua tau zoo ntawm hydroxypropyl methylcellulose.
Qhov fineness ntawm hydroxypropyl methylcellulose kuj muaj qee qhov cuam tshuam rau nws cov dej khaws cia. Feem ntau hais lus, rau hydroxypropyl methylcellulose nrog tib viscosity tab sis sib txawv fineness, qhov finer qhov finer qhov finer Lub dej khaws cia nyhuv zoo dua.
Hauv cov mortar ntub-sib xyaw, qhov ntxiv ntawm cellulose ether HPMC yog qhov tsawg heev, tab sis nws tuaj yeem txhim kho kev ua tau zoo ntawm cov mortar ntub-sib xyaw, thiab nws yog ib qho khoom ntxiv tseem ceeb uas cuam tshuam rau kev ua tau zoo ntawm mortar. Kev xaiv tsim nyog ntawm hydroxypropyl methylcellulose kom raug muaj kev cuam tshuam loj rau kev txhim kho kev ua tau zoo ntawm cov mortar ntub-sib xyaw.
Lub sijhawm tshaj tawm: Lub Peb Hlis-31-2023