HPMC tuaj yeem muab faib ua qib kev tsim kho, qib zaub mov thiab qib tshuaj raws li lub hom phiaj. Tam sim no, feem ntau ntawm cov khoom siv hauv tsev yog qib kev tsim kho, thiab hauv qib kev tsim kho, cov hmoov putty yog loj heev. Sib tov HPMC hmoov nrog ntau ntau ntawm lwm cov hmoov hmoov, sib tov kom huv si nrog lub tov khoom, thiab tom qab ntawd ntxiv dej kom yaj, ces HPMC tuaj yeem yaj nyob rau lub sijhawm no yam tsis muaj kev sib xyaw ua ke, vim tias txhua lub kaum me me, me ntsis ntawm HPMC hmoov, sib ntsib. dej. yuav yaj tam sim ntawd. Putty hmoov thiab mortar manufacturers feem ntau siv txoj kev no. Hydroxypropyl methylcellulose (HPMC) yog siv los ua cov thickener thiab dej tuav tus neeg sawv cev hauv cov hmoov mortar.
Lub gel kub ntawm HPMC muaj feem xyuam rau nws cov ntsiab lus methoxy, qhov qis dua cov ntsiab lus methoxy ↓, siab dua gel kub ↑. Cov dej txias tam sim ntawm HPMC yog ntog kho nrog glyoxal, thiab nws tawg sai sai hauv dej txias, tab sis nws tsis yaj tiag tiag. Nws tsuas yog yaj thaum lub viscosity nce. Kub yaj hom tsis nto kho nrog glyoxal. Yog hais tias tus nqi ntawm glyoxal loj, qhov dispersion yuav ceev, tab sis lub viscosity yuav nce maj mam, thiab yog hais tias tus nqi yog me me, qhov opposite yuav muaj tseeb. HPMC tuaj yeem muab faib ua hom instant thiab kub dissolution hom. Cov khoom lag luam tam sim no tawg sai sai hauv dej txias thiab ploj mus rau hauv dej. Lub sijhawm no, cov kua dej tsis muaj viscosity vim tias HPMC tsuas yog tawg mus rau hauv dej yam tsis muaj kev sib cais tiag tiag. Txog 2 feeb, cov viscosity ntawm cov kua maj mam nce, tsim cov pob tshab viscous colloid. Cov khoom kub yaj, thaum ntsib nrog dej txias, tuaj yeem tawg sai sai hauv dej kub thiab ploj hauv dej kub. Thaum qhov kub thiab txias poob rau qee qhov kub, qhov viscosity yuav maj mam tshwm kom txog thaum nws tsim cov pob tshab viscous colloid. Hom kub-melt tsuas yog siv rau hauv cov hmoov putty thiab mortar. Hauv cov kua nplaum thiab pleev xim, yuav muaj kev sib koom ua ke thiab siv tsis tau. Hom instant muaj ntau yam kev siv. Nws tuaj yeem siv rau hauv cov hmoov putty thiab mortar, nrog rau cov kua nplaum thiab pleev xim, tsis muaj contraindications.
HPMC tsim los ntawm txoj kev hnyav siv toluene thiab isopropanol ua cov kuab tshuaj. Yog tias kev ntxhua khaub ncaws tsis zoo, yuav muaj qee qhov tsw ntxhiab tsw. Daim ntawv thov ntawm cov hmoov putty: qhov yuav tsum tau muaj tsawg, viscosity yog 100,000, nws txaus, qhov tseem ceeb yog kom dej zoo. Daim ntawv thov ntawm mortar: siab dua, siab viscosity, 150,000 zoo dua. Daim ntawv thov ntawm cov kua nplaum: cov khoom siv tam sim nrog cov viscosity siab yog yuav tsum tau. Tus nqi ntawm HPMC siv nyob rau hauv cov ntaub ntawv siv tau txawv nyob ntawm qhov chaw huab cua, qhov kub thiab txias, cov hmoov tshauv calcium hauv zos zoo, cov hmoov putty hmoov thiab "zoo xav tau los ntawm cov neeg siv khoom". Lub viscosity ntawm hydroxypropyl methylcellulose (HPMC)-putty hmoov yog feem ntau 100,000, thiab qhov yuav tsum tau rau mortar yog siab dua, thiab nws xav tau 150,000 kom yooj yim siv. Ntxiv mus, lub luag haujlwm tseem ceeb ntawm HPMC yog dej tuav, ua raws li cov thickening. Hauv cov hmoov putty, tsuav yog cov dej tuav tau zoo thiab cov viscosity tsawg (70,000-80,000), kuj tseem tuaj yeem ua tau. Tau kawg, qhov siab dua qhov viscosity, qhov zoo dua qhov txheeb ze dej tuav. Thaum lub viscosity siab tshaj 100,000, lub viscosity yuav cuam tshuam cov dej tuav. Tsis ntau dhau; cov uas muaj cov ntsiab lus hydroxypropyl siab feem ntau muaj cov dej tuav tau zoo dua. Ib qho uas muaj viscosity siab muaj cov dej tuav tau zoo dua, thiab ib qho uas muaj viscosity siab zoo siv hauv cov cement mortar.
Hauv cov hmoov putty, HPMC plays peb lub luag haujlwm ntawm thickening, dej tuav thiab kev tsim kho. Tsis txhob koom nrog kev tawm tsam. Qhov laj thawj ntawm cov npuas yuav yog cov dej ntau dhau los, lossis nws yuav yog cov txheej hauv qab tsis qhuav, thiab lwm txheej yog khawb rau saum, thiab nws yooj yim ua npuas dej. Thickening nyhuv ntawm HPMC nyob rau hauv putty hmoov: cellulose yuav thickened rau ncua, ua kom cov kev daws teeb meem zoo ib yam, thiab tiv sagging. Cov dej tuav cov nyhuv ntawm HPMC hauv cov hmoov putty: ua kom cov hmoov putty qhuav maj mam, thiab pab cov hmoov tshauv calcium kom hnov qab hauv dej. Kev tsim cov nyhuv ntawm HPMC hauv cov hmoov putty: cellulose muaj cov nyhuv lubricating, uas tuaj yeem ua rau cov hmoov putty muaj kev tsim kho zoo. HPMC tsis koom nrog cov tshuaj tiv thaiv, tab sis tsuas yog ua lub luag haujlwm pabcuam.
Cov hmoov poob ntawm putty hmoov yog feem ntau muaj feem xyuam rau qhov zoo ntawm cov hmoov tshauv calcium, thiab muaj me ntsis ua rau HPMC. Cov ntsiab lus calcium uas tsis tshua muaj ntawm cov calcium grey thiab qhov tsis zoo ntawm CaO thiab Ca (OH) 2 hauv cov calcium grey yuav ua rau cov hmoov poob. Yog tias nws muaj qee yam ua rau HPMC, ces yog tias cov dej tuav ntawm HPMC tsis zoo, nws tseem yuav ua rau cov hmoov poob. Ntxiv dej rau cov hmoov putty thiab muab tso rau ntawm phab ntsa yog cov tshuaj tiv thaiv, vim tias cov tshuaj tshiab tau tsim, thiab cov hmoov putty rau ntawm phab ntsa raug tshem tawm ntawm phab ntsa. Down, hauv av rau hauv hmoov, thiab rov siv dua, nws yuav tsis ua haujlwm, vim tias cov tshuaj tshiab (calcium carbonate) tau tsim. Cov khoom tseem ceeb ntawm cov hmoov tshauv calcium hmoov yog: sib tov ntawm Ca (OH) 2, CaO thiab ib qho me me ntawm CaCO3, CaO + H2O = Ca (OH) 2 — Ca (OH) 2 + CO2 = CaCO3↓ + H2O Ash calcium yog nyob rau hauv dej thiab huab cua Raws li qhov kev txiav txim ntawm CO2, calcium carbonate yog tsim, thaum HPMC tsuas yog khaws cov dej, pab cov tshuaj tiv thaiv zoo ntawm cov tshauv calcium, thiab tsis koom nrog. tej yam tshuaj tiv thaiv nws tus kheej.
Post lub sij hawm: Mar-18-2023