Hydroxypropyl methylcellulose (HPMC)yog ib qho tseem ceeb polymer compound lug siv nyob rau hauv lub teb ntawm cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv cement mortar. Nws txhim kho cov cuab yeej tiv thaiv kev tawg ntawm cov cement mortar nrog nws cov kev ua tau zoo heev, yog li txhim kho kev tsim kho kev ua tau zoo thiab kav ntev ntawm mortar.
1. Cov khoom tseem ceeb ntawm hydroxypropyl methylcellulose
HPMC yog ib qho uas tsis yog-ionic cellulose ether tau los ntawm chemically modifying natural cellulose. Nws muaj dej solubility zoo, dej tuav thiab adhesion, thiab nthuav tawm cov tshuaj lom neeg ruaj khov thiab biocompatibility. Hauv cov ntaub ntawv cement-based, AnxinCel®HPMC feem ntau txhim kho kev ua haujlwm ntawm cov ntaub ntawv los ntawm kev tswj cov tshuaj tiv thaiv dej thiab tus cwj pwm viscosity.
2. Mechanism ntawm kev txhim kho cov khoom tiv thaiv dispersion ntawm cov cement mortar
Anti-dispersion khoom yog hais txog lub peev xwm ntawm cov cement mortar los tswj nws txoj kev ncaj ncees nyob rau hauv dej scouring lossis vibration tej yam kev mob. Tom qab ntxiv HPMC, nws cov txheej txheem ntawm kev txhim kho kev tiv thaiv kev tawg feem ntau suav nrog cov hauv qab no:
2.1. Txhim khu kev tuav dej
HPMC molecules tuaj yeem tsim cov hydration zaj duab xis rau saum npoo ntawm cov cement, uas txo cov evaporation tus nqi ntawm cov dej thiab txhim kho cov dej tuav lub peev xwm ntawm mortar. Kev tuav dej zoo tsis yog tsuas yog txo qhov kev pheej hmoo ntawm dej poob thiab tawg ntawm mortar, tab sis kuj txo cov dispersion ntawm cov khoom uas tshwm sim los ntawm dej poob, yog li txhim kho kev tiv thaiv dispersion.
2.2. Nce viscosity
Ib qho ntawm lub luag haujlwm tseem ceeb ntawm HPMC yog txhawm rau ua kom cov viscosity ntawm mortar. High viscosity tso cai rau cov khoom siv hauv cov tshuaj khib nyiab kom nruj dua ua ke, ua rau nws nyuaj rau kev tawg thaum raug rau sab nraud quab yuam. Lub viscosity ntawm HPMC hloov nrog kev hloov pauv hauv cov concentration thiab kub, thiab kev xaiv tsim nyog ntawm qhov sib ntxiv tuaj yeem ua tiav cov txiaj ntsig zoo tshaj plaws.
2.3. Txhim kho thixotropy
HPMC muab mortar zoo thixotropy, uas yog, nws muaj viscosity siab nyob rau hauv lub zoo li qub, thiab lub viscosity txo thaum raug shear quab yuam. Cov yam ntxwv zoo li no ua rau cov mortar yooj yim kis tau thaum lub sijhawm tsim kho, tab sis nws tuaj yeem rov qab viscosity sai sai hauv lub xeev zoo li qub los tiv thaiv kev tawg thiab ntws.
2.4. Optimize interface kev ua haujlwm
HPMC yog sib npaug sib npaug hauv cov mortar, uas tuaj yeem tsim tus choj ntawm cov khoom thiab txhim kho lub zog sib txuas ntawm cov khoom. Tsis tas li ntawd, kev ua haujlwm saum npoo ntawm HPMC tuaj yeem txo qhov nro ntawm cov cement particles, yog li ntxiv dag zog rau kev tiv thaiv kev ua haujlwm.
3. Kev siv cov teebmeem thiab qhov zoo
Hauv cov haujlwm tiag tiag, cov cement mortar tov nrog HPMC qhia tau hais tias muaj kev txhim kho tseem ceeb hauv kev ua haujlwm tiv thaiv kev tawg. Cov hauv qab no yog qee qhov zoo tshaj plaws:
Txhim kho kev tsim kho kev ua haujlwm: Cov tshuaj khib nyiab nrog kev ua haujlwm zoo tiv thaiv kev sib cais yog yooj yim rau kev tswj thaum lub sij hawm tsim kho thiab tsis yooj yim rau kev sib cais lossis los ntshav.
Txhim kho qhov zoo ntawm qhov chaw: Lub adhesion ntawm mortar ntawm lub hauv paus yog txhim kho, thiab nto tom qab plastering los yog paving yog smoother.
Txhim khu durability: Txo cov dej poob hauv cov mortar, txo qhov nce ntawm qhov voids tshwm sim los ntawm dispersion, thiab yog li txhim kho qhov ntom thiab durability ntawm mortar.
4. Muaj feem cuam tshuam thiab cov tswv yim ua kom zoo
Cov nyhuv ntawm HPMC ntxiv yog ze ze rau nws cov koob tshuaj, qhov hnyav molecular thiab ib puag ncig. Qhov sib ntxiv ntawm qhov tsim nyog ntawm HPMC tuaj yeem txhim kho kev ua haujlwm ntawm cov tshuaj khib nyiab, tab sis kev sib ntxiv ntau dhau tuaj yeem ua rau muaj viscosity ntau dhau thiab cuam tshuam rau kev tsim kho. Cov tswv yim optimization muaj xws li:
Xaiv HPMC nrog qhov hnyav molecular thiab qib kev hloov pauv: HPMC nrog qhov hnyav dua molecular muab viscosity ntau dua, tab sis kev ua tau zoo thiab kev ua haujlwm yuav tsum sib npaug raws li cov ntawv thov tshwj xeeb.
Precisely tswj tus nqi ntxiv: HPMC feem ntau yog ntxiv rau hauv tus nqi ntawm 0.1% -0.5% ntawm qhov hnyav ntawm cov cement, uas yuav tsum tau kho raws li qhov xav tau tiag tiag.
Ua tib zoo saib xyuas qhov chaw tsim kho: Kub thiab av noo muaj qhov cuam tshuam loj rau kev ua haujlwm ntawmHPMC, thiab cov qauv yuav tsum tau hloov kho nyob rau hauv cov xwm txheej sib txawv kom ua tiav cov txiaj ntsig zoo tshaj plaws.
Daim ntawv thov ntawm hydroxypropyl methylcellulose hauv cov cement mortar zoo txhim kho cov khoom siv los tiv thaiv kev tawg, yog li txhim kho kev tsim kho kev ua haujlwm thiab kev ua haujlwm ntev ntawm cov tshuaj khib. Los ntawm kev tshawb fawb tob txog cov txheej txheem ntawm kev ua haujlwm ntawm AnxinCel®HPMC thiab kev ua kom zoo dua cov txheej txheem ntxiv, nws cov txiaj ntsig kev ua tau zoo tuaj yeem ua tau ntxiv los muab cov kev daws teeb meem zoo dua rau kev tsim kho.
Post lub sij hawm: Jan-17-2025