Hydroxypropyl Methylcellulose (HPMC)yog cov cellulose ether uas tsis yog ionic, uas siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog hauv cov tshuaj pleev xim. Raws li cov khoom siv ua tau zoo, HPMC feem ntau yog siv los ua cov dej khaws cia, cov khoom ua kom tuab, cov roj nplua nyeem thiab cov khoom khi, thiab muaj cov txiaj ntsig zoo hauv kev txhim kho kev ua haujlwm ntawm cov tshuaj pleev xim.
1. Cov yam ntxwv tseem ceeb ntawm HPMC
HPMC yog ib qho polymer compound hloov kho los ntawm cov cellulose ntuj los ntawm ntau yam kev tshuaj lom neeg. Nws cov qauv molecular muaj cov pab pawg xws li methoxy (-OCH₃) thiab hydroxypropyl (-CH₂CHOHCH₃). Qhov muaj cov substituents no ua rau HPMC solubility zoo thiab ruaj khov, ua rau nws yaj sai hauv dej txias los ua cov kua viscous pob tshab. Nws muaj kev ruaj khov thermal zoo, enzymatic stability thiab muaj zog adaptability rau acids thiab alkalis, thiab siv dav hauv cov ntaub ntawv tsim kho, coatings, tshuaj, zaub mov thiab lwm yam lag luam.
2. Lub luag haujlwm ntawm HPMC hauv kev kho cov tshuaj khib
Txhim kho kev khaws dej
Tom qab ntxiv HPMC rau hauv cov tshuaj pleev kho, nws cov kev ua tau zoo heev ntawm kev khaws dej tuaj yeem ncua qhov dej poob thiab xyuas kom muaj dej txaus rau cov cement. Qhov no tseem ceeb heev rau kev tsim kho txheej nyias lossis qhov chaw qhuav kub, uas pab tiv thaiv teeb meem xws li tawg thiab delamination, thiab txhim kho qhov ceev thiab lub zog ntawm cov tshuaj pleev.
Txhim kho kev ua haujlwm tau zoo
HPMC tuaj yeem ua kom lubricity thiab ua haujlwm tau zoo ntawm cov mortar, ua rau cov mortar kho du thaum lub sijhawm thov, yooj yim dua rau kev khiav lag luam thiab tsim. Nws cov nyhuv lubricating txo cov cuab yeej tsis kam thaum lub sijhawm tsim kho, uas pab txhim kho kev ua haujlwm ntawm kev tsim kho thiab qhov chaw tiav.
Txhim kho kev ua tau zoo ntawm kev sib txuas
Cov tshuaj pleev kho feem ntau siv los kho cov chaw qub, xav tau kev sib txuas zoo ntawm cov tshuaj pleev thiab lub hauv paus. Qhov cuam tshuam ntawm HPMC ua rau cov tshuaj pleev thiab lub hauv paus tuab dua, txo qhov kev pheej hmoo ntawm kev hollow thiab poob tawm, tshwj xeeb tshaj yog thaum tsim kho hauv cov khoom tshwj xeeb xws li cov chaw ntsug lossis qab nthab.
Tswj kev sib xws thiab tiv thaiv kev sagging
Qhov ua kom tuab ntawm HPMC tuaj yeem tswj tau qhov sib xws ntawm cov mortar, ua rau nws tsis tshua muaj peev xwm sag lossis plam thaum siv rau ntawm qhov chaw ntsug lossis qhov chaw inclined, thiab tswj qhov ruaj khov ntawm cov mortar thaum ntxov ntawm kev tsim. Qhov no yog qhov tseem ceeb rau kev txhim kho qhov zoo ntawm kev tsim kho thiab ua tiav kev kho kom zoo.
Kev tiv thaiv kab nrib pleb zoo dua
Vim tias HPMC txhim kho qhov kev khaws cia dej thiab kev ywj pheej ntawm cov mortar, nws tuaj yeem ua rau qeeb qeeb ntawm cov txheej txheem shrinkage, yog li ua kom zoo tiv thaiv kev tsim cov kab nrib pleb shrinkage thiab txhim kho qhov ruaj khov ntawm cov txheej kho.
3. Kev xyaum siv thiab cov lus qhia txog kev noj tshuaj
Hauv kev siv tiag tiag, qhov ntau npaum li cas ntawm HPMC feem ntau yog 0.1% txog 0.3% ntawm qhov hnyav ntawm cov tshuaj khib. Qhov ntau npaum li cas tshwj xeeb yuav tsum tau kho raws li hom tshuaj khib, ib puag ncig kev tsim kho thiab kev ua tau zoo uas xav tau. Kev siv tshuaj tsis txaus yuav tsis ua lub luag haujlwm tsim nyog, thaum kev siv tshuaj ntau dhau yuav ua rau cov tshuaj khib tuab dhau, ua rau lub sijhawm teeb tsa ntev dua, thiab txawm tias cuam tshuam rau lub zog kawg.
Yuav kom ua tiav qhov zoo tshaj plaws, nws raug pom zoo kom siv nws ua ke nrog lwm cov khoom ntxiv xws li cov hmoov latex redispersible, cov dej txo, cov fiber tiv thaiv kev tawg, thiab lwm yam, thiab ua kom zoo dua cov qauv tsim raws li cov txheej txheem tsim kho thiab cov kev xav tau.
Daim ntawv thov ntawmHPMCHauv kev kho cov tshuaj khib tau dhau los ua ib txoj hauv kev tseem ceeb los txhim kho kev ua haujlwm ntawm cov khoom. Nws cov dej zoo heev, thickening, workability thiab adhesion tsis yog tsuas yog txhim kho kev siv ntawm cov tshuaj khib, tab sis kuj muab kev txhawb nqa rau kev kho kev tsim kho hauv cov chaw nyuaj. Raws li kev lag luam kev tsim kho txuas ntxiv nce nws cov kev xav tau rau kev ua haujlwm ntawm cov ntaub ntawv kho, tus nqi ntawm daim ntawv thov ntawm HPMC yuav dhau los ua qhov tseem ceeb, thiab nws yuav yog ib qho tseem ceeb tsis tseem ceeb hauv lub cev ua haujlwm siab yav tom ntej.
Lub sijhawm tshaj tawm: Plaub Hlis-04-2025