Qhuav mortar, tseem hu ua phab ntsa putty, yog ib qho kev sib xyaw siv los ua kom du thiab theem sab hauv thiab sab nrauv phab ntsa ua ntej pleev xim. Ib qho ntawm cov khoom tseem ceeb ntawm cov tshuaj khib nyiab qhuav yog hydroxypropyl methylcellulose (HPMC), uas ua cov thickener thiab binder. Thaum tsim cov hmoov qhuav mortar, qhov kev xaiv raug ntawm HPMC viscosity yog qhov tseem ceeb heev los xyuas kom meej qhov zoo ntawm cov khoom kawg.
HPMC yog cellulose ether, uas yog npaj los ntawm kev kho cellulose nrog alkali thiab ces reacting nrog methyl chloride thiab propylene oxide. HPMC yog cov khoom siv ntau yam uas feem ntau siv rau ntau yam kev siv, suav nrog hauv kev tsim kho kev lag luam rau kev tsim cov tshuaj khib nyiab qhuav. HPMC txhim kho kev ua haujlwm ntawm putty hmoov qhuav mortar los ntawm kev txhim kho nws cov dej tuav, kev ua haujlwm thiab kev sib koom ua ke.
Lub viscosity ntawm HPMC yog qhov tseem ceeb los txiav txim siab qhov ua tau zoo ntawm putty hmoov qhuav mortar. Viscosity yog ib qho kev ntsuas ntawm cov kua dej tsis kam ntws, feem ntau qhia hauv centipoise (cP). HPMC muaj nyob rau hauv viscosities xws li 100 cP mus rau 150,000 cP thiab, nyob ntawm daim ntawv thov, cov qib sib txawv ntawm HPMC muaj nyob nrog ntau yam viscosities.
Thaum tsim cov hmoov qhuav mortar, qhov kev xaiv ntawm HPMC viscosity yuav tsum nyob ntawm ntau yam, xws li qhov xwm txheej ntawm lwm cov khoom xyaw, qhov xav tau mortar sib xws, thiab ib puag ncig. Feem ntau, HPMCs viscosity siab dua yog siv rau cov khoom hnyav dua thiab hnyav dua, thaum qis dua viscosity HPMCs yog siv rau cov khoom sib dua thiab sib dua.
Ib qho txiaj ntsig tseem ceeb ntawm kev siv HPMC nyob rau hauv putty qhuav mortars yog nws lub peev xwm los ua kom cov dej tuav tau. HPMC absorbs thiab khaws cov dej noo, uas pab tiv thaiv cov mortar kom qhuav sai heev. Qhov no yog ib qho tseem ceeb tshwj xeeb tshaj yog nyob rau hauv kub, qhuav huab cua, raws li lub mortar tuaj yeem qhuav sai heev, ua rau tawg thiab adhesion tsis zoo. Cov viscosity siab dua HPMCs tuaj yeem khaws cov dej ntau dua, ua rau lawv tsim nyog rau kev siv hauv qhov chaw qhuav.
Lwm yam khoom tseem ceeb ntawm HPMC yog nws lub peev xwm los txhim kho kev ua haujlwm. HPMC ua raws li cov roj nplua nyeem, ua kom yooj yim rau cov tshuaj khib kom sib kis thiab txo cov kev siv zog uas yuav tsum tau ua kom tiav qhov chaw du. Tsawg viscosity HPMCs feem ntau yog siv rau kev ua tau yooj yim dua, thaum HPMCs viscosity siab dua yog siv rau cov ntawv thov nyuaj.
Ntxiv nrog rau nws cov dej tuav thiab ua haujlwm tau zoo, HPMC tuaj yeem txhim kho kev sib koom ua ke ntawm putty hmoov qhuav mortar. HPMC muab kev sib raug zoo ntawm cov mortar thiab qhov chaw uas nws tau pleev xim rau, kom ntseeg tau tias cov mortar nyob hauv qhov chaw thiab tsis tawg lossis tawg tawm. Kev xaiv ntawm HPMC viscosity yuav muaj kev cuam tshuam rau qib ntawm adhesion muab los ntawm mortar, nrog ntau dua viscosity HPMCs feem ntau muab cov adhesion zoo dua.
Feem ntau, kev xaiv ntawm HPMC viscosity yog ib qho tseem ceeb rau kev txiav txim siab thaum tsim cov hmoov putty qhuav mortar, thiab yuav tsum tau ua raws li cov kev siv tshwj xeeb thiab ib puag ncig. Los ntawm kev xaiv cov qib raug ntawm HPMC, cov dej tuav, kev ua haujlwm thiab kev sib koom ua ke ntawm cov tshuaj khib tuaj yeem txhim kho, ua kom cov khoom tiav zoo. Nrog rau qhov kev xaiv raug ntawm HPMC viscosity, nws muaj peev xwm tsim tau cov tshuaj khib nyiab qhuav ntawm qhov zoo ib yam uas tuaj yeem siv tau yooj yim dua thiab ua tau zoo hauv ntau hom kev siv.
Post lub sij hawm: Lub Xya hli ntuj-28-2023