Hydroxypropyl methylcellulose (HPMC)yog ib yam khoom siv polymer uas yaj tau hauv dej uas siv dav hauv cov mortars qhuav niaj hnub no, ua lub luag haujlwm tseem ceeb, tshwj xeeb tshaj yog hauv cov txheej txheem nplaum pobzeb. Nrog rau kev nrov zuj zus ntawm kev teeb tsa pobzeb nyias thiab cov pobzeb loj, qhov xav tau ntau dua rau kev ua haujlwm tau zoo, lub zog sib txuas, thiab kev ruaj khov ntawm cov nplaum pobzeb. HPMC yog ib qho ntawm cov khoom siv tseem ceeb uas ua rau muaj kev sib npaug ntawm kev ua tau zoo no.
Lub luag haujlwm tseem ceeb tshaj plaws ntawm HPMC yog los txhim kho kev khaws dej ntawm cov nplaum pobzeb. Cov nplaum pobzeb xav tau dej txaus thaum siv kom ntseeg tau tias cov cement noo tag nrho. Yog tias kev khaws dej tsis txaus, dej yooj yim nqus los ntawm cov substrate lossis cov pobzeb, ua rau cov cement noo tsis tiav thiab txo qis lub zog sib txuas. Thaum yaj hauv dej, HPMC tsim cov qauv polymer network sib xws, zoo kaw cov dej dawb thiab qeeb qeeb poob dej, ua rau cov nplaum pobzeb tswj tau kev sib txuas ruaj khov thaum lub sijhawm qhib. Qhov no yog qhov tseem ceeb tshwj xeeb rau cov substrates uas nqus dej ntau lossis rau kev tsim kho hauv qhov chaw qhuav, kub siab.
HPMC txhim kho qhov ua haujlwm tau zoo thiab kev tuav cov khoom ntawm cov nplaum pobzeb. Los ntawm kev hloov kho cov qib viscosity sib txawv ntawm HPMC, cov nplaum pobzeb tuaj yeem ua tiav qhov sib xyaw zoo thiab du, nrog rau kev tiv thaiv nruab nrab thaum thov, tiv thaiv kev sagging lossis tawg. Thixotropy zoo tso cai rau cov nplaum pobzeb kom ua kua ntau dua hauv qab kev ntxhov siab thiab sai sai rov qab tau nws qhov sib xws tom qab kev ntxhov siab raug tshem tawm, pab txhawb kev tsim cov qauv trowel notched, txhim kho qhov sib xws ntawm kev tso pobzeb thiab kev ua haujlwm ntawm kev tsim kho, thiab txo cov khoom pov tseg.
HPMC kuj tseem ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv kev plam thiab tiv thaiv kev sagging. Hauv kev teeb tsa vuas phab ntsa, qhov hnyav ntawm cov vuas tuaj yeem ua rau kev plam yooj yim, cuam tshuam rau qhov tseeb ntawm kev tsim kho thiab txawm tias ua rau delamination. Los ntawm kev txhim kho qhov kev ntxhov siab thiab kev ruaj khov ntawm cov qauv, HPMC ua rau cov nplaum vuas muaj cov khoom tiv thaiv kev plam zoo heev thaum tswj hwm lub zog sib txuas zoo, xyuas kom meej tias cov vuas tseem ruaj khov thiab tsis txav thaum lub sijhawm pib tso, ua tau raws li cov kev cai rau kev tiv thaiv kev plam hauv cov qauv cuam tshuam xws li EN12004.
HPMC kuj pab txhim kho lub zog sib txuas thiab lub zog ruaj khov ntawm cov nplaum pobzeb. Ib puag ncig zoo khaws dej kom zoo txhawb nqa kev ua kom cov cement noo tag nrho, tsim cov qauv khoom ntub dej, yog li ua kom muaj kev sib txuas ntawm cov nplaum pobzeb thiab cov khoom siv thiab sab nraub qaum ntawm cov pobzeb. Lub caij no, HPMC kuj tseem tuaj yeem txhim kho cov qauv me me ntawm cov mortar, txo qhov kev ntxhov siab ntawm kev qhuav, thiab txo qhov tsim ntawm cov kab nrib pleb me me, yog li cuam tshuam zoo rau kev ruaj khov ntawm kev sib txuas mus sij hawm ntev thiab kev tiv thaiv kev laus.
Hauv kev siv tiag tiag, kev xaiv cov khoom zooHPMCviscosity thiab qib ntawm kev hloov pauv yog qhov tseem ceeb. HPMC qis-viscosity zoo dua rau kev ntws thiab lubrication, thaum nruab nrab-rau-siab viscosity HPMC ua tau zoo dua hauv kev khaws dej thiab tiv thaiv kev plam. Feem ntau, qhov ntau ntawm HPMC ntxiv rau cov qauv nplaum pobzeb yog qis, tab sis nws qhov cuam tshuam rau kev ua tau zoo yog qhov tseem ceeb. Yog li ntawd, kev xaiv lub hom phiaj yog qhov tsim nyog raws li hom pobzeb, txoj kev tsim kho, thiab huab cua.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-29-2025