HPMC muaj peev xwm 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 hauv tsev yog qib kev tsim kho, thiab hauv qib kev tsim kho, qhov ntau ntawm cov hmoov putty yog loj heev. Sib tov HPMC hmoov nrog ntau ntawm lwm cov hmoov tshuaj, sib tov lawv kom huv si nrog lub tshuab sib tov, thiab tom qab ntawd ntxiv dej kom yaj, tom qab ntawd HPMC tuaj yeem yaj lub sijhawm no yam tsis muaj kev sib sau ua ke, vim txhua lub ces kaum me me, me ntsis ntawm HPMC hmoov, ntsib dej. yuav yaj tam sim ntawd. Cov chaw tsim khoom hmoov putty thiab mortar feem ntau siv txoj kev no. Hydroxypropyl methylcellulose (HPMC) yog siv los ua tus neeg sawv cev thickener thiab dej khaws cia hauv putty hmoov mortar.
Qhov kub ntawm HPMC gel muaj feem cuam tshuam nrog nws cov ntsiab lus methoxy, qhov qis dua cov ntsiab lus methoxy ↓, qhov siab dua qhov kub ntawm gel ↑. Cov dej txias instant hom HPMC yog kho nrog glyoxal, thiab nws disperses sai sai hauv dej txias, tab sis nws tsis yaj tiag tiag. Nws tsuas yog yaj thaum viscosity nce. Cov hom kub yaj tsis kho nrog glyoxal. Yog tias qhov ntau ntawm glyoxal loj, qhov dispersion yuav ceev, tab sis viscosity yuav nce qeeb, thiab yog tias qhov ntau me me, qhov rov qab yuav muaj tseeb. HPMC tuaj yeem faib ua hom instant thiab hom kub-dissolving. Cov khoom hom instant disperses sai sai hauv dej txias thiab ploj mus rau hauv dej. Lub sijhawm no, cov kua tsis muaj viscosity vim HPMC tsuas yog disperses hauv dej yam tsis muaj kev yaj tiag tiag. Kwv yees li 2 feeb, qhov viscosity ntawm cov kua maj mam nce, tsim cov pob tshab viscous colloid. Cov khoom kub-yaj, thaum ntsib nrog dej txias, tuaj yeem disperse sai sai hauv dej kub thiab ploj mus rau hauv dej kub. Thaum qhov kub poob mus rau qee qhov kub, qhov viscosity yuav maj mam tshwm sim kom txog thaum nws tsim cov pob tshab viscous colloid. Hom kub-yaj tsuas yog siv tau rau hauv cov hmoov putty thiab mortar. Hauv cov kua nplaum thiab xim, yuav muaj cov xwm txheej sib sau ua ke thiab tsis tuaj yeem siv. Hom tam sim ntawd muaj ntau yam kev siv. Nws tuaj yeem siv rau hauv cov hmoov putty thiab mortar, nrog rau kua nplaum thiab xim, tsis muaj kev tsis sib haum xeeb.
Cov HPMC uas tsim los ntawm txoj kev siv cov tshuaj yaj siv toluene thiab isopropanol ua cov tshuaj yaj. Yog tias ntxuav tsis zoo heev, yuav muaj qee qhov tsw ntxhiab seem. Kev siv cov hmoov putty: qhov yuav tsum tau ua tsawg, qhov viscosity yog 100,000, nws txaus, qhov tseem ceeb yog kom dej zoo. Kev siv cov mortar: qhov yuav tsum tau ua siab dua, viscosity siab, 150,000 zoo dua. Kev siv cov kua nplaum: cov khoom lag luam tam sim ntawd nrog viscosity siab yog qhov xav tau. Tus nqi ntawm HPMC siv rau hauv kev siv ua haujlwm sib txawv nyob ntawm qhov chaw huab cua, kub, qhov zoo ntawm cov tshauv calcium hauv zos, cov mis hmoov putty thiab "qhov zoo uas cov neeg siv khoom xav tau". Qhov viscosity ntawm hydroxypropyl methylcellulose (HPMC) -putty hmoov feem ntau yog 100,000, thiab qhov yuav tsum tau ua rau mortar siab dua, thiab nws xav tau 150,000 kom yooj yim siv. Ntxiv mus, lub luag haujlwm tseem ceeb ntawm HPMC yog kev khaws dej, ua raws li kev ua kom tuab. Hauv cov hmoov putty, tsuav yog qhov khaws cia dej zoo thiab qhov viscosity qis (70,000-80,000), nws kuj ua tau. Tau kawg, qhov siab dua qhov viscosity, qhov zoo dua qhov khaws cia dej. Thaum qhov viscosity tshaj 100,000, qhov viscosity yuav cuam tshuam rau qhov khaws cia dej. Tsis ntau dhau; cov uas muaj cov ntsiab lus hydroxypropyl siab feem ntau muaj qhov khaws cia dej zoo dua. Qhov uas muaj viscosity siab muaj qhov khaws cia dej zoo dua, thiab qhov uas muaj viscosity siab zoo dua siv rau hauv cov cement mortar.
Hauv cov hmoov putty, HPMC ua peb lub luag haujlwm ntawm kev ua kom tuab, khaws dej thiab tsim kho. Tsis txhob koom nrog kev tsis sib haum xeeb. Qhov laj thawj rau cov npuas yuav yog vim muaj dej ntau dhau, lossis nws yuav yog tias txheej hauv qab tsis qhuav, thiab lwm txheej raug khawb rau saum, thiab nws yooj yim ua npuas dej. Cov nyhuv thickening ntawm HPMC hauv cov hmoov putty: cellulose tuaj yeem ua kom tuab kom ncua, khaws cov tshuaj sib xws thiab sib xws, thiab tiv taus sagging. Cov nyhuv khaws dej ntawm HPMC hauv cov hmoov putty: ua rau cov hmoov putty qhuav qeeb qeeb, thiab pab cov tshauv calcium kom teb raws li kev ua ntawm dej. Cov nyhuv tsim kho 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 kev tsis sib haum xeeb tshuaj, tab sis tsuas yog ua lub luag haujlwm pabcuam.
Qhov poob ntawm cov hmoov putty feem ntau yog cuam tshuam nrog qhov zoo ntawm cov tshauv calcium, thiab tsis muaj feem cuam tshuam nrog HPMC. Cov calcium tsawg ntawm grey calcium thiab qhov sib piv tsis raug ntawm CaO thiab Ca (OH) 2 hauv grey calcium yuav ua rau poob hmoov. Yog tias nws muaj feem cuam tshuam nrog HPMC, ces yog tias HPMC khaws dej tsis zoo, nws kuj tseem yuav ua rau cov hmoov poob tawm. Ntxiv dej rau cov hmoov putty thiab muab tso rau ntawm phab ntsa yog ib qho tshuaj lom neeg, vim tias cov tshuaj tshiab tau tsim, thiab cov hmoov putty ntawm phab ntsa raug tshem tawm ntawm phab ntsa. Hauv qab, zom ua 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 yog: sib xyaw ntawm Ca (OH) 2, CaO thiab me me ntawm CaCO3, CaO + H2O = Ca (OH) 2—Ca (OH) 2 + CO2 = CaCO3↓ + H2O Cov tshauv calcium nyob hauv dej thiab huab cua Hauv qab qhov kev ua ntawm CO2, calcium carbonate yog tsim, thaum HPMC tsuas yog khaws dej, pab txhawb kev ua haujlwm zoo dua ntawm cov tshauv calcium, thiab tsis koom nrog hauv kev ua haujlwm nws tus kheej.
Lub sijhawm tshaj tawm: Lub Peb Hlis-18-2023