Raws li kev thov rau kev tsim kho cov khoom loj hlob, yog li qhov kev xav tau rau cov tshuaj ntxiv uas txhim kho kev ua tau zoo thiab ua kom muaj txiaj ntsig. Siab viscosity methylcellose (HPMC) yog ib qho ntxiv ntxiv thiab tau siv dav hauv cov ntawv sau coll cov ntaub ntawv qhuav. HPMC yog cov organic ntau yam nrog cov khoom sib txuas zoo zoo thiab cov khoom siv tuab, ua rau nws zoo tagnrho rau cov haujlwm tsim kho.
Cho koob tshuaj yog cov khoom nrov siv los ua cov cib, thaiv thiab lwm yam kev tsim tsev. Nws yog tsim los ntawm kev sib xyaw dej, cement thiab xuab zeb (thiab qee zaum lwm yam ntxiv) los ua tus txhuam hniav du thiab zoo nkauj. Nyob ntawm daim ntawv thov thiab ib puag ncig, tshuaj khib dries hauv cov theem sib txawv, thiab txhua theem yuav tsum tau muaj cov khoom sib txawv. HPMC tuaj yeem muab cov khoom no nyob rau txhua theem, ua rau nws muaj kev ntxiv rau cov khoom noj.
Thaum pib theem ntawm kev sib xyaw, HPMC ua raws li phau ntawv qhia, pab tuav qhov sib xyaw ua ke. Lub viscos siab ntawm HPMC kuj ua kom muaj kev sib xyaw du thiab zoo ib yam, txhim kho cov txheej txheem ua kom muaj txiaj ntsig thiab txo qhov kev pheej hmoo ntawm kev tawg. Raws li cov sib tov dries thiab hardens, HPMC cov yeeb yaj kiab tiv thaiv uas pab tiv thaiv kom tiv thaiv shrinkage thiab tawg uas tuaj yeem ua rau cov qauv tsis muaj zog.
Ntxiv rau nws cov khoom nplaum thiab kev tiv thaiv kev tiv thaiv, HPMC kuj muaj dej txuag zoo thiab tshem tawm lub peev xwm. Qhov no txhais tau tias lub tshuaj khib nyob twj ywm usable rau lub sijhawm ntev dua, tso cai ntau lub sijhawm los kho thiab txhim kho cov khoom tiav. Dej khaws cia kuj tseem ua kom pom tseeb tias lub tshuaj khib tsis qhuav sai, uas yuav ua rau tawg thiab txo qhov zoo tag nrho ntawm txoj haujlwm.
Thaum kawg, HPMC kuj yog cov tuab zoo tshaj uas txhim kho qhov zoo tagnrho ntawm cov sib tov. Cov khoom thickening ntawm HPMC pab txo sagging lossis sagging, uas tuaj yeem tshwm sim thaum sib tov tsis tuab txaus. Qhov no txhais tau tias cov khoom tiav yuav muaj ntau dua thiab ntawm cov khoom zoo dua qub, kom muaj kev xav tau ntawm txoj haujlwm.
Zuag qhia tag nrho, siab viscosity methylcellulose yog ib qho tseem ceeb ntxiv rau cov ntawv thov qhuav. Nws txoj kev sib raug zoo, kev tiv thaiv, dej-khaws cia kom ntseeg tau tias lub tshuaj khib yog qhov tseem ceeb tshaj plaws rau kev tsim kho thiab kev ua haujlwm ntawm cov haujlwm tsim kho. Siv HPMC nyob rau hauv cov ntaub ntawv coll cap kuj tseem tuaj yeem txuas lub neej ntawm cov qauv, txo cov nqi kho, thiab txhim kho kev nyab xeeb ntawm lub tsev.
Hauv cov ntsiab lus xaus, qhov kev thov rau cov khoom lag luam hauv tsev loj hlob thiab siv cov tshuaj tua kab mob loj (HPMC) hauv cov ntawv thov qhuav yog nce. HPMC muaj cov nplaum zoo tshaj plaws, kev tiv thaiv, kev tiv thaiv dej thiab thickening cov khoom, ua rau nws tseem ceeb ntxiv rau txoj haujlwm tsim kho. Siv HPMC nyob rau hauv cov ntaub ntawv cug qhuav tsis tsuas yog txhim kho cov kev ua tau zoo thiab kav cov qauv, tab sis kuj txhim kho nws cov kev pabcuam lub neej thiab tag nrho zoo.
Lub Sijhawm Post: Jul-19-2023