Hydroxypropyl methylcellulose (HPMC) yog cov khoom muaj ntau yam thiab tseem ceeb hauv cov tshuaj mortar, ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab tag nrho cov khoom zoo thiab kev ua haujlwm ntawm cov tshuaj khib. Mortar yog cov khoom siv hauv tsev siv hauv kev tsim kho los khi cib, pob zeb, thiab lwm yam masonry units ua ke. Qhov zoo ntawm mortar yog cuam tshuam los ntawm ntau yam, thiab kev xaiv thiab zoo ntawm cov khoom siv ntxiv (xws li HPMC) yog qhov tseem ceeb los xyuas kom meej qhov kev ua tau zoo.
Taw qhia rau Hydroxypropyl Methylcellulose (HPMC):
Chemical structure thiab composition:
Hydroxypropylmethylcellulose yog ib tug polymer muab los ntawm cellulose, ib tug natural polymer pom nyob rau hauv cov nroj tsuag cell phab ntsa. Cov qauv tshuaj ntawm HPMC yog tus cwj pwm los ntawm cov piam thaj rov qab nrog ntau pawg hydroxypropyl thiab methoxy txuas rau hauv cov pob txha cellulose. Qib ntawm kev hloov pauv (DS) ntawm cov pab pawg no txiav txim siab txog cov khoom ntawm HPMC, suav nrog kev solubility, gelation, thiab muaj peev xwm tsim cov yeeb yaj kiab.
Kev tsim khoom:
Kev tsim tawm ntawm HPMC suav nrog etherification ntawm cellulose nrog propylene oxide thiab methyl chloride. Cov txheej txheem no qhia txog hydroxypropyl thiab methoxy pawg rau hauv cov saw cellulose, tsim cov dej-soluble polymer nrog ntau yam kev siv.
Lub luag haujlwm ntawm HPMC hauv mortar:
Kev tuav dej:
Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC hauv mortar yog dej tuav. Qhov hydrophilic xwm ntawm HPMC tso cai rau nws nqus thiab khaws cov dej noo, tiv thaiv kom tsis txhob ya raws sai thaum lub sijhawm teeb tsa thiab kho cov theem. Qhov no yog qhov tseem ceeb los xyuas kom meej hydration ntawm cov cement hais, thaum kawg pab txhim kho lub zog thiab durability ntawm mortar.
Txhim kho machinability:
HPMC ua raws li kev hloov kho rheology hauv mortar, txhim kho nws txoj haujlwm thiab yooj yim ntawm kev siv. Cov polymer muaj cov nyhuv lubricating, txo kev sib txhuam ntawm cov khoom thiab ua kom yooj yim txawm tias faib cov mortar thaum tsim kho. Qhov kev txhim kho no ua haujlwm tau zoo tshwj xeeb hauv cov masonry, tso cai rau kev ua kom zoo dua qub thiab txo lub cev ua haujlwm thaum tsim kho.
Txhim kho adhesion thiab kev sib txuas:
HPMC muaj kev cuam tshuam zoo rau cov khoom sib txuas ntawm mortar. Cov polymer ua ib zaj duab xis nyias nyob ib ncig ntawm cov cement hais, tsim kom muaj kev sib koom ua ke uas txhim kho qhov adhesion ntawm mortar rau cov masonry units. Qhov kev txhim kho kev sib raug zoo no yog qhov tseem ceeb rau lub tsev tsim kev ncaj ncees, tiv thaiv kev tawg thiab ua kom muaj kev ruaj ntseg mus ntev.
Tswj lub sijhawm teem sijhawm:
HPMC tuaj yeem cuam tshuam lub sijhawm teeb tsa ntawm mortar los ntawm kev tswj cov dej ntawm cov cement. Lub polymer ua raws li ib tug retarder, slowing down txheej txheem thiab ncua kev ua tau zoo. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv kev tsim kho loj, qhov chaw ncua sij hawm muab kev yooj yim dua hauv kev thov thiab kev hloov kho.
Crack kuj:
Cracking yog ib qho teeb meem tshwm sim nrog mortar thiab feem ntau tshwm sim los ntawm shrinkage thaum lub sij hawm ziab. HPMC pab daws qhov teeb meem no los ntawm kev txo cov dej noo los ntawm evaporation, yog li txo qis qhov tawg. Cov khoom siv polymer cov yeeb yaj kiab tsim pab txhim kho cov tshuaj khib nyiab tag nrho rau kev tawg, ua kom muaj kev ruaj khov thiab zoo nkauj zoo nkauj.
Uniform xim thiab kev ntxhib los mos:
Ntxiv rau nws txoj haujlwm ua haujlwm, HPMC tuaj yeem txhim kho qhov zoo nkauj ntawm mortar. Cov polymer pab tswj cov xim sib xws thiab kev ntxhib los mos los ntawm kev tiv thaiv cov khoom xyaw los ntawm kev sib cais thiab ua kom muaj kev sib xyaw ua ke ntawm cov khoom ntxiv. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv kev tsim kho daim ntawv thov qhov twg cov tsos ntawm cov mortar yog ib qho tseem ceeb tsim kev txiav txim siab.
Qhov cuam tshuam ntawm HPMC zoo ntawm mortar:
Purity thiab Consistency:
Qhov zoo ntawm HPMC cuam tshuam ncaj qha rau nws cov kev ua haujlwm hauv mortar. High-purity HPMC muaj cov chemistry zoo ib yam uas ua kom ntseeg tau thiab kwv yees cov txiaj ntsig hauv dej tuav, kev ua haujlwm thiab kev ua kom zoo. Cov impurities lossis kev hloov pauv hauv cov khoom sib xyaw tuaj yeem ua rau cov mortar coj tus cwj pwm tsis sib xws, cuam tshuam rau tag nrho lub tsev zoo.
Particle loj thiab kev faib tawm:
Qhov loj me me thiab kev faib tawm ntawm HPMC cov khoom ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm cov polymer hauv cov tshuaj khib nyiab. Fine particles muab kev tiv thaiv zoo dua thiab ua cov yeeb yaj kiab, pab txhim kho adhesion thiab tuav dej. Kev tswj xyuas kev ua tau zoo thaum lub sij hawm tsim khoom yog qhov tseem ceeb rau kev tswj xyuas cov yam ntxwv uas xav tau rau kev ua haujlwm zoo.
Degree ntawm kev hloov pauv (DS):
Qib ntawm kev hloov pauv, uas sawv cev rau tus naj npawb ntawm hydroxypropyl thiab methoxy pawg ntawm cov pob txha cellulose, yog qhov tseem ceeb tsis zoo rau kev ua haujlwm ntawm HPMC. Kev siab dua DS feem ntau ua rau muaj dej ntau ntxiv thiab muaj peev xwm tsim tau zaj duab xis. Cov kev cai tshwj xeeb ntawm daim ntawv thov mortar txiav txim siab qhov zoo tshaj plaws DS, thiab cov kev hloov pauv hauv qhov ntsuas no yuav cuam tshuam rau kev ua tau zoo ntawm cov polymer hauv cov tshuaj khib nyiab.
Viscosity sib xws:
Lub viscosity ntawm cov tshuaj HPMC yog qhov tseem ceeb kom ua tiav cov khoom rheological ntawm cov tshuaj khib nyiab. Cov viscosity tsis sib haum ua rau muaj kev hloov pauv hauv kev ua haujlwm thiab cov yam ntxwv ntawm daim ntawv thov. Kev tswj xyuas kom zoo los xyuas kom meej cov viscosity zoo ib yam los ntawm batch mus rau batch yog qhov tseem ceeb rau kev ua tau zoo ntawm HPMC hauv mortars.
Compatibility nrog lwm yam additives:
Mortar formulations feem ntau suav nrog ntau yam tshuaj ntxiv kom ua tiav cov hom phiaj kev ua tau zoo. Qhov zoo ntawm HPMC yog qhov tseem ceeb los xyuas kom muaj kev sib raug zoo nrog lwm cov khoom xyaw xws li accelerators, retarders lossis air-entraining agents. Kev tsis sib haum xeeb tuaj yeem ua rau muaj kev cuam tshuam tsis zoo nrog rau lub sijhawm hloov pauv, txo lub zog, lossis kev cuam tshuam ntev.
Tej yam yuav tsum tau xav txog thaum xaiv HPMC rau mortar formulations:
Cov kev xav tau ntawm daim ntawv thov:
Kev xaiv ntawm HPMC yuav tsum ua raws li cov cai tshwj xeeb ntawm daim ntawv thov mortar. Cov kev tsim kho sib txawv yuav xav tau ntau theem ntawm kev tuav dej, kev ua haujlwm lossis sijhawm teem sijhawm. Kev nkag siab txog qhov project specifications thiab ib puag ncig tej yam kev mob yog ib qho tseem ceeb rau xaiv tus HPMC qib uas tsim nyog tshaj.
Cement hom thiab muaj pes tsawg leeg:
Hom thiab muaj pes tsawg leeg ntawm cov cement siv nyob rau hauv mortar formulation cuam tshuam rau kev sib raug zoo thiab kev ua tau zoo ntawm HPMC. Cov yam ntxwv xws li qhov zoo ntawm cov cement hais thiab muaj cov khoom siv cementitious yuav tsum raug coj mus rau hauv tus account thaum xaiv HPMC los xyuas kom meej kev sib koom ua ke nrog lwm cov khoom.
Environmental tej yam kev mob:
Kev nyab xeeb thiab ib puag ncig ntawm qhov chaw tsim kho ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm mortar. Kev xaiv ntawm HPMC yuav tsum xav txog yam xws li kub, av noo thiab tshav ntuj raug, vim tias cov xwm txheej no yuav cuam tshuam rau lub sijhawm teeb tsa thiab kev ua haujlwm ntawm cov mortar.
Txoj Cai Ua Raws Cai:
Thaum xaiv HPMC rau mortar daim ntawv thov, ua raws li cov qauv kev cai thiab cov ntawv pov thawj yog qhov tseem ceeb. Ua raws li cov qauv kev lag luam ua kom muaj kev sib luag thiab kev ua haujlwm zoo hauv kev tsim khoom, txo qhov kev pheej hmoo ntawm kev npaj txhij txog teeb meem thaum tsim kho.
nyob rau hauv xaus:
Nyob rau hauv cov ntsiab lus, hydroxypropyl methylcellulose (HPMC) yog ib tug multifunctional polymer uas muaj feem xyuam rau qhov zoo ntawm mortar hauv kev tsim kho. Nws lub luag haujlwm hauv kev tuav dej, kev ua haujlwm, adhesion thiab tawg kuj ua rau nws yog ib qho tseem ceeb muaj nyob rau hauv niaj hnub mortar formulations. Qhov zoo ntawm HPMC yog qhov tseem ceeb heev vim nws cuam tshuam ncaj qha rau nws cov kev ua tau zoo thiab yog li tag nrho cov khoom tsim tau zoo.
Kev nkag siab txog chemistry thiab kev ua haujlwm ntawm HPMC hauv mortars tuaj yeem muab kev nkag siab zoo rau nws daim ntawv thov thiab pab kom paub txog kev txiav txim siab thaum xaiv thiab tsim txheej txheem. Kev tswj xyuas kev ua tau zoo, kev ua tau zoo sib xws, thiab kev txiav txim siab ntawm cov phiaj xwm tshwj xeeb yog qhov tseem ceeb hauv kev ua kom ntseeg tau, siv tau zoo ntawm HPMC hauv mortars.
Post lub sij hawm: Dec-18-2023