HydroxyPropyyl methylcellose (HPMC) yog ib feem siv dej-soluble polymer dav siv hauv cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog cov txiv duaj-raws li cov nplaum. Lub zog tshuaj tshwj xeeb thiab lub cev ntawm HPMC ua rau nws ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov nplaum, kev tsim kho, thiab kav dej ruaj khov, thiab kav dej ruaj khov.
(1) Kev paub yooj yim ntawm HPMC
1. Cov qauv siv tshuaj ntawm HPMC
HPMC yog lub cellulose derivative tau los ntawm cov tshuaj kho kho mainfaj ke. Nws cov qauv feem ntau yog tsim los ntawm methoxy (-chiv) thiab hydroxyprropoxy (-ch₂chohch) pab pawg hloov qee pab pawg hydroxyl ntawm lub cellulose saw. Tus qauv no muab HPMC zoo solubility thiab hydration muaj peev xwm.
2. Lub zog ntawm HPMC
Solubility: HPMC tuaj yeem yaj hauv dej txias los tsim cov tshuaj colloidal colloidal thiab muaj kev muaj peev xwm zoo.
Thermogelation: HPMC kev daws teeb meem yuav tsim cov gel thaum ua kom sov thiab rov qab mus rau lub xeev ua kua tom qab txias.
Cov kev ua si saum npoo: HPMC muaj cov dej num zoo hauv kev daws teeb meem, uas pab ua kom muaj kev ruaj khov npuas.
Cov khoom tshwj xeeb ntawm lub cev thiab tshuaj lom neeg ua HPMC ib cov khoom zoo tshaj plaws rau kev hloov pauv cement-raws li cov nplais nplaum.
(2) kev siv hpmc txhim kho kev ua tau zoo ntawm cov txiv masas raws li cov nplaum nplaum
1. Txhim Kho Cov Dej Ua Haujlwm
Lub hauv paus ntsiab lus: HPMC ua qauv tsim qauv network hauv kev daws teeb meem, uas tuaj yeem xauv rau hauv noo noo. Lub peev txheej hauv kev khaws cia no yog vim muaj cov pab pawg hydrophilic (xws li pawg hydroxules, uas tuaj yeem nqus thiab khaws tau ntau ntawm cov dej noo.
Txhim kho adchesion: cement-raws cov nplaum nplaum yuav tsum muaj yaa las kom koom tau hauv cov tshuaj dej ntawm cov dej ua kom tawv. HPMC tswj hwm lub xub ntiag ntawm noo noo, tso cai rau cov xis mas hydrate rau txhua lub zog taub hau, li kev txhim kho cov nplaum ntawm cov nplaum.
Ncua Qhib Sijhawm: Cov dej tuav tseg tiv thaiv cov nplaum los ntawm kev ua kom qhuav sai thaum kev tsim kho, ncua kev hloov kho lub sijhawm rau cov nplais nteg.
2. Txhim kho kev tsim kho kev tsim kho
Lub hauv paus ntsiab lus: HPMC muaj cov nyhuv zoo heev, thiab nws cov molecules tuaj yeem tsim cov qauv kev sib txawv, yog li nce lub viscosity ntawm kev daws.
Txhim kho cov khoom tiv thaiv sagging: lub thickened slurry tau zoo dua los ntawm txoj hauj lwm kev tsim txom thaum lub sij hawm paving txheej txheem vim tias lub ntiajteb txawj nqus.
Kev txhim kho Fluidity: Qhov tsim nyog viscosity ua kom yooj yim thov thiab kis thaum lub sij hawm kev tsim kho, thiab tib lub sijhawm muaj kev nyuaj, txo qhov nyuaj ntawm kev tsim kho.
3. Txhim kho kom ruaj khov
Lub hauv paus ntsiab lus: HPMC txhim kho cov dej khaws cia thiab cov nplaum ntawm cov nplaum, yog li kev txhim kho lub durability ntawm cov cegent-raws cov nplais nplaum.
Txhim kho kev sib raug zoo ua lub zog: cov hmoov av noo noo muab cov nplaum nplaum muaj zog thiab tsis yog dhau los poob lossis tawg thaum siv sijhawm ntev.
Txhim khu cov dej tsis kam: Cov dej zoo kom tsis txhob muaj cov nplaum loj ntawm cov nplaum, yog li txo cov teeb meem tawg los ntawm shrinkage.
(3) kev sim cov ntaub ntawv txhawb nqa
1. Dej khaws cia
Cov kev tshawb fawb tau pom tias cov dej khaws cov khoom noj kom ua tiav ntawm cov txiv mabas-raws cov nplaum nplaum nrog kev sib ntxiv ntawm HPMC tau txhim kho. Piv txwv li, ntxiv 0.2% HPMC mus rau cov nplaum tuaj yeem ua kom cov dej khaws nyiaj rov qab los ntawm 70% mus rau 95%. Qhov kev txhim kho no yog qhov tseem ceeb heev los txhim kho cov kev sib raug zoo ntawm lub zog thiab lub durability ntawm cov nplaum.
2. Viscosity Test
Tus nqi HPMC ntxiv muaj qhov cuam tshuam tseem ceeb ntawm viscosity. Ntxiv 0.3% HPMC rau cov cegent-raws cov pobzeb nplaum tuaj yeem ua rau muaj cov viscosity ob peb zaug, ua kom cov nplaum muaj kev ua haujlwm zoo thiab kev tsim kho.
3. Daim Ntawv Cog Lus Lub Zog
Los ntawm kev sib piv cov kev sim, nws tau pom tias qhov kev sib koom tes ntawm cov vuas uas muaj HPMC yog qhov zoo dua li cov nplaum tsis muaj HPMC. Piv txwv li, tom qab ntxiv 0.5% HPMC, lub zog sib raug zoo tuaj yeem nce li 30%.
(4) Cov Ntawv Thov Piv Txwv
1. Kev tso cov vuas hauv av thiab cov vuas Ntsa
Nyob rau hauv qhov tiag tiag nteg hauv pem teb vuas thiab phab vuas ntsa, hpmc-txhim kho cov cegent-raws cov pob zeb nplaum uas tau ua tiav zoo dua kev tsim kho thiab kav ntev. Thaum lub sij hawm tsim kho, cov nplaum tsis yooj yim kom poob dej sai sai, ua kom muaj kev txhim kho smoothness ntawm kev tsim kho thiab lub tiaj tiaj ntawm cov vuas.
2. Sab Nraud Phab Ntsa Rwb Thaiv Tsev
HPMC-Txhim Kho Cov nplaum tseem muaj dav siv nyob rau hauv phab ntsa sab nraud phab ntsa rwb thaiv tsev. Nws cov dej ua haujlwm zoo thiab cov nplaum kom ua kom muaj kev sib raug zoo ntawm cov board thiab phab ntsa, yog li kev txhim kho lub durability thiab ruaj khov ntawm phab ntsa sab nraud thiab muaj kev sib cais ntawm phab ntsa sab nraud.
Daim ntawv thov ntawm HPMC hauv cov cegent-raws cov pobzeb nplaum tau txhim kho cov kev ua tau zoo ntawm cov nplaum. Los ntawm kev txhim kho cov dej khaws cia, txhim kho kev ua haujlwm thiab kev ua kom ruaj khov, HPMC ua cov cegent-raws li cov khoom xyaw-raws li kev tsim kho niaj hnub. Nrog rau kev txhim kho thev naus laus zis thiab kev nce qib nce rau cov ntaub ntawv ua haujlwm hauv tsev, thov cov kev cia siab ntawm HPMC yuav nthuav dav.
Lub Sijhawm Post: Jun-26-2024