Hydroxypropyl Methylcellulose (HPMC) ua lub luag haujlwm tseem ceeb hauv cov tshuaj mortar sib xyaw qhuav. Cov tshuaj mortar sib xyaw qhuav yog cov khoom siv hmoov qhuav uas ua los ntawm kev sib xyaw cov pob zeb, cement, cov khoom sau thiab ntau yam khoom ntxiv rau hauv ib qho feem pua. Nws tuaj yeem siv rau ntawm qhov chaw tsim kho los ntawm kev ntxiv dej thiab do. Ua ib qho cellulose ether ua haujlwm tau zoo heev, HPMC ua ntau yam haujlwm hauv cov tshuaj mortar sib xyaw qhuav, yog li txhim kho kev ua haujlwm ntawm cov tshuaj mortars.
1. Kev khaws dej
Lub luag haujlwm tseem ceeb ntawm HPMC yog los txhim kho qhov khaws dej ntawm cov mortar. Vim tias cov cellulose molecules muaj ntau pawg hydroxyl thiab methoxy, lawv tuaj yeem tsim cov hydrogen bonds nrog cov dej molecules, yog li ua kom lub peev xwm khaws dej ntawm cov mortar zoo dua. Kev khaws dej zoo tso cai rau cov dej noo hauv cov mortar kom tsis txhob evaporate sai rau lub sijhawm ntev dua, uas yog qhov tseem ceeb rau kev ncua sijhawm qhib, txhim kho kev ua haujlwm ntawm kev tsim kho, txo cov kab nrib pleb thiab txhim kho lub zog ntawm cov mortar. Tshwj xeeb tshaj yog nyob rau hauv kev tsim kho ntawm cov khoom siv kub lossis qis-nqus dej, cov dej khaws cia ntawm HPMC yog qhov pom tseeb dua.
2. Txhim kho kev ua haujlwm ntawm kev tsim kho
HPMC muab cov khoom siv zoo heev rau cov mortar. Ua ntej, nws txhim kho qhov ua haujlwm ntawm cov mortar, ua rau cov mortar sib xyaw ua ke zoo dua thiab zoo. Qhov thib ob, HPMC txhim kho thixotropy ntawm mortar, uas yog, cov mortar tuaj yeem tswj tau qee qhov sib xws thaum nres, tab sis ntws yooj yim thaum muaj kev ntxhov siab. Qhov cwj pwm no ua rau cov mortar muaj kev ua haujlwm zoo thiab kev twj tau zoo thaum lub sijhawm tsim kho, thiab yooj yim rau kev thov thiab du. Tsis tas li ntawd, HPMC tuaj yeem txo qhov kev sib txuas ntawm cov mortar thaum lub sijhawm tsim kho, ua rau cov cuab yeej tsim kho yooj yim dua los ntxuav.
3. Cov khoom tiv thaiv kev qaug zog
Thaum lub sijhawm tsim kho ntawm cov chaw ntsug, cov tshuaj mortar feem ntau sag vim yog lub ntiajteb txawj nqus, cuam tshuam rau qhov zoo ntawm kev tsim kho. HPMC tuaj yeem txhim kho qhov kev tiv thaiv sag ntawm cov tshuaj mortar, ua rau cov tshuaj mortar lo rau ntawm qhov chaw ntawm cov khoom siv hauv cov theem thaum ntxov tom qab kev tsim kho thiab zam kev sag. Qhov no tseem ceeb heev rau cov ntaub ntawv xws li cov nplaum pobzeb thiab cov tshuaj plaster uas yuav tsum tau siv rau ntawm cov chaw ntsug.
4. Txhim kho qhov kev khaws cia ntawm cov yas
HPMC tuaj yeem txhim kho qhov kev khaws cia ntawm cov mortar, ua rau nws tsis tshua muaj peev xwm ntsws thiab tawg thaum lub sijhawm kho. Nws lub tshuab yog ua kom cov dej noo ntau ntxiv los ntawm kev txhim kho cov qauv me me ntawm cov mortar, yog li txo qhov dej evaporation. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem tsim ib qho qauv network hauv cov mortar, txhim kho lub zog tensile thiab kev ywj pheej ntawm cov mortar, thiab txo cov kab nrib pleb los ntawm kev ntsws ntawm cov mortar thaum lub sijhawm ua kom tawv.
5. Txhim kho lub zog sib txuas
HPMC tuaj yeem txhim kho lub zog sib txuas ntawm cov mortar. Qhov no feem ntau yog vim muaj cov pawg polar uas muaj nyob hauv nws cov qauv molecular, uas tuaj yeem nqus tau nrog cov molecules ntawm qhov chaw ntawm lub substrate thiab txhim kho lub zog sib txuas ntawm cov mortar thiab lub substrate. Tib lub sijhawm, qhov khaws dej uas HPMC muab kuj pab cov cement hydration reaction kom ua tiav tag nrho, yog li txhim kho lub zog sib txuas ntawm cov mortar.
6. Kho qhov sib xws ntawm cov mortar
HPMC kuj tseem tuaj yeem kho qhov sib xws ntawm cov mortar kom cov mortar ua tiav qhov fluidity thiab workability tom qab ntxiv dej. HPMC nrog cov viscosities sib txawv tuaj yeem siv rau hauv ntau hom mortars. Kev xaiv cov khoom tsim nyog raws li qhov xav tau tiag tiag tuaj yeem ua rau cov mortar yooj yim dua los tswj thiab siv thaum lub sijhawm tsim kho.
7. Txhim kho kev ruaj khov ntawm cov av nplaum
HPMC tuaj yeem txhim kho qhov ruaj khov ntawm cov mortar thiab txo qhov sib cais ntawm cov mortar thaum lub sijhawm sib tov thiab thauj mus los. Vim nws cov nyhuv ua kom tuab, nws tuaj yeem ruaj khov cov khoom khov hauv cov mortar, tiv thaiv kev sib sau ua ke thiab kev tawg, thiab ua kom cov mortar nyob rau hauv lub xeev sib xws thaum lub sijhawm tsim kho.
8. Kev tiv thaiv huab cua
Qhov ntxiv ntawm HPMC tuaj yeem txhim kho qhov kev tiv thaiv huab cua ntawm cov mortar, tshwj xeeb tshaj yog nyob rau hauv cov huab cua hnyav. Nws tuaj yeem txo qhov kev ntxhov siab thermal los ntawm kev hloov pauv kub hauv cov mortar, yog li txhim kho qhov ruaj khov thiab kev pabcuam lub neej ntawm cov mortar.
Ua ib qho khoom siv tseem ceeb, hydroxypropyl methylcellulose tau txhim kho cov khoom siv npaj ua kom qhuav los ntawm nws txoj kev khaws dej zoo heev, kev hloov kho kev ua haujlwm ntawm kev tsim kho, kev tiv thaiv sag, kev khaws cia plasticity zoo dua thiab lub zog sib txuas. Qhov zoo thiab kev ua haujlwm ntawm cov tshuaj sib xyaw. Nws daim ntawv thov tsis tsuas yog txhim kho cov khoom siv lub cev ntawm cov tshuaj mortar, tab sis kuj txhim kho kev ua haujlwm ntawm kev tsim kho thiab txo qhov nyuaj ntawm kev tsim kho, yog li siv dav hauv kev tsim kho.
Lub sijhawm tshaj tawm: Lub Xya Hli-04-2024