Hydroxypropyl methylcellulose (HPMC) yog ib qho tseem ceeb ntxiv rau hauv cov nplaum niaj hnub thiab cov tshuaj sib xyaw ua ke hauv kev tsim kho. Nws cov yam ntxwv ua haujlwm ntau yam txhim kho txhua yam ntawm cov qauv nplaum, pab txhim kho kev ua haujlwm, kev khaws dej, kev nplaum thiab kev ua haujlwm tag nrho.
Kev lag luam kev tsim kho tseem niaj hnub nrhiav cov kev daws teeb meem tshiab los txhim kho kev ua tau zoo thiab kev ruaj khov ntawm cov ntaub ntawv tsim kho. Ntawm ntau yam khoom siv ntxiv rau hauv cov tshuaj tsim kho, hydroxypropyl methylcellulose (HPMC) tau nyiam mloog vim nws muaj ntau yam zoo hauv cov nplaum pobzeb thiab cov tshuaj sib xyaw ua ke. HPMC yog ib qho khoom siv los ntawm cellulose nrog cov yam ntxwv tshwj xeeb uas tuaj yeem cuam tshuam zoo rau kev ua tau zoo ntawm cov nplaum thiab txhim kho qhov zoo ntawm cov haujlwm tsim kho. Lub hom phiaj ntawm tsab xov xwm no yog los tshawb nrhiav lub luag haujlwm thiab cov txiaj ntsig ntawm HPMC hauv cov nplaum pobzeb thiab cov tshuaj sib xyaw ua ke, piav qhia txog nws cov tshuaj lom neeg, cov txheej txheem ua haujlwm thiab cov txiaj ntsig uas nws muab rau kev lag luam kev tsim kho.
1. Cov tshuaj lom neeg muaj pes tsawg leeg thiab cov khoom ntawm HPMC:
Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer semi-synthetic uas tau hloov kho los ntawm cellulose. Nws yog synthesized los ntawm kev kho cellulose nrog propylene oxide thiab methyl chloride, tsim cov tshuaj nrog hydroxypropyl thiab methyl substituents (-OH thiab -CH3 pawg) txuas rau cellulose backbone. Qib ntawm kev hloov pauv (DS) ntawm hydroxypropyl thiab methyl pawg txiav txim siab cov khoom ntawm HPMC, suav nrog viscosity, solubility, thiab thermal stability.
HPMC muaj cov dej solubility zoo heev thiab tsim cov kua pob tshab thiab viscous thaum dispersed hauv dej. Txawm li cas los xij, nws cov solubility nyob ntawm qhov kub thiab txias, nrog rau qhov kub siab dua nyiam dissolve. Cov yam ntxwv no ua rau HPMC haum rau kev siv hauv cov tshuaj siv hauv kev tsim kho qhov twg cov txheej txheem dej-raws li muaj ntau. Tsis tas li ntawd, HPMC muab cov cwj pwm pseudoplastic rau cov tshuaj, txhais tau tias nws cov viscosity txo qis hauv qab shear kev ntxhov siab, yog li ua rau yooj yim ntawm kev siv thiab txhim kho cov txheej txheem ntawm cov nplaum formulations.
2. Lub tshuab ua haujlwm ntawm cov nplais pobzeb ceramic:
Hauv cov qauv nplaum pobzeb, HPMC ua haujlwm ntau yam haujlwm vim nws cov qauv tshuaj lom neeg thiab cov khoom tshwj xeeb. Ib qho ntawm nws cov haujlwm tseem ceeb yog ua kom tuab, txhim kho qhov sib xws thiab ua haujlwm tau ntawm cov nplaum. Los ntawm kev nce viscosity, HPMC pab tiv thaiv cov nplaum mortar los ntawm sagging lossis collapsing, xyuas kom meej tias muaj kev npog zoo thiab kev sib txuas ntawm cov pobzeb thiab substrate.
HPMC kuj ua haujlwm ua tus neeg sawv cev khaws dej, uas tso cai rau cov nplaum kom khaws cov dej noo txaus thaum lub sijhawm kho. Cov yam ntxwv no yog qhov tseem ceeb los xyuas kom meej tias cov khoom siv cementitious hauv cov nplaum muaj dej txaus, txhawb kev sib txuas ruaj khov thiab txo qhov kev pheej hmoo ntawm kev tawg. Tsis tas li ntawd, HPMC lub peev xwm tuav dej pab ncua lub sijhawm qhib, tso cai rau lub sijhawm txaus rau kev tso vuas thiab kho ua ntej cov nplaum teeb tsa.
HPMC tsim ib daim zaj duab xis uas yoog tau thiab nplaum thaum ziab, yog li ntawd nws thiaj li ua rau cov nplaum ntawm cov vuas pobzeb zoo dua. Daim zaj duab xis no ua haujlwm ua ib daim nplaum, txhawb kev sib txuas ntawm cov txheej nplaum, cov vuas pobzeb thiab cov khoom siv hauv pem teb. Qhov muaj HPMC ua rau lub zog sib txuas thiab kev ruaj khov ntawm cov vuas pobzeb, txo qhov muaj peev xwm ntawm kev tshem tawm lossis kev tawg ntawm lub sijhawm.
3. Kev cuam tshuam rau cov tshuaj sib xyaw ua ke hauv kev tsim kho:
Ntxiv rau cov nplaum rau pobzeb, HPMC siv dav hauv ntau yam tshuaj sib xyaw ua ke, suav nrog cov mortars, plasters thiab grouts. Nws cov yam ntxwv ua haujlwm ntau yam ua rau nws yog ib qho khoom siv tseem ceeb los txhim kho kev ua tau zoo thiab kev ruaj khov ntawm cov ntaub ntawv no. Hauv cov mortars, HPMC ua haujlwm ua tus hloov pauv rheology, tswj tus cwj pwm ntws thiab kev sib xws ntawm cov khoom sib xyaw. Qhov no ua kom ntseeg tau tias kev siv sib xws thiab kev ua haujlwm zoo dua, pab txhawb kev tso thiab txo cov khoom pov tseg.
HPMC pab txhim kho cov yam ntxwv ntawm cov khoom sib xyaw hauv pem teb thiab cov noob SCR, ua rau muaj qhov chaw du thiab sib npaug. Nws lub peev xwm tuav dej tiv thaiv cov khoom sib xyaw kom tsis txhob qhuav ua ntej lub sijhawm, txhawb kev kho kom zoo thiab txo qhov tsis zoo ntawm qhov chaw xws li tawg lossis tawg. Tsis tas li ntawd, HPMC txhim kho kev sib txuas thiab kev sib txuas ntawm cov plasters thiab grouts, ua rau muaj kev ua tiav zoo dua thiab zoo nkauj dua.
Kev siv HPMC hauv cov tshuaj sib xyaw ua ke hauv kev tsim kho yog ua raws li lub hom phiaj ntawm kev lag luam kev tsim kho kom ruaj khov. Los ntawm kev txhim kho kev ua haujlwm thiab txo kev siv khoom siv, HPMC pab txhawb rau kev siv cov peev txheej zoo thiab txo cov khib nyiab. Tsis tas li ntawd, nws lub luag haujlwm hauv kev txhim kho qhov ruaj khov ntawm cov ntaub ntawv tsim kho pab txuas lub neej ntawm lub tsev, yog li txo qhov xav tau kev kho lossis hloov pauv ntau zaus.
Hydroxypropyl methylcellulose (HPMC) ua lub luag haujlwm tseem ceeb hauv cov nplaum niaj hnub thiab cov tshuaj sib xyaw ua ke hauv kev tsim kho, muab ntau yam txiaj ntsig uas pab txhim kho kev ua haujlwm, kev ua haujlwm tau zoo thiab kev ruaj khov. Nws cov tshuaj sib xyaw ua ke thiab cov yam ntxwv tshwj xeeb ua rau nws ua haujlwm ua cov khoom ua kom tuab, tus neeg sawv cev khaws dej thiab tus neeg txhawb nqa kev nplaum hauv cov qauv nplaum. Tsis tas li ntawd, HPMC txhim kho cov khoom rheological ntawm cov tshuaj sib xyaw ua ke hauv kev tsim kho kom yooj yim rau kev siv thiab xyuas kom meej tias cov khoom tiav lawm.
Kev siv HPMC dav dav hauv kev lag luam kev tsim kho qhia txog nws qhov tseem ceeb ua ib qho khoom siv ntxiv uas ua rau qhov zoo thiab kev ruaj khov ntawm cov ntaub ntawv tsim kho. Raws li kev coj ua hauv kev tsim kho txuas ntxiv mus, qhov xav tau cov kev daws teeb meem tshiab los txhim kho kev ua haujlwm zoo thiab kev ruaj khov yuav tsav tsheb ntxiv kev tshawb fawb thiab kev tsim cov qauv raws li HPMC. Los ntawm kev siv lub peev xwm ntawm HPMC, kev lag luam kev tsim kho tuaj yeem ua tiav kev nce qib hauv kev ua tau zoo ntawm cov khoom siv thiab pab txhawb rau kev tsim kom muaj ib puag ncig zoo dua thiab ruaj khov.
Lub sijhawm tshaj tawm: Lub Ob Hlis-26-2024