qhia:
Hydroxypropylmethylcellulose (HPMC) yog cov dej-soluble polymer feem ntau siv nyob rau hauv ntau yam kev lag luam thiab kev siv tshuaj vim nws cov yeeb yaj kiab zoo heev tsim, khi thiab thickening zog. Ntawm nws cov ntawv thov ntau, HPMC tau siv dav hauv kev tsim kho kev lag luam rau nws cov peev xwm tuav dej.
Kev tuav dej yog ib qho cuab yeej tseem ceeb uas txiav txim siab qhov ua tau zoo ntawm cov khoom siv hauv tsev xws li mortar, cement thiab pob zeb. Thaum HPMC ntxiv rau cov ntaub ntawv no, nws tuaj yeem ua kom lawv cov dej tuav tau zoo, ua rau muaj kev ua tau zoo dua, txo qis thiab muaj zog ntxiv.
Txawm li cas los xij, ntau yam tuaj yeem cuam tshuam cov dej tuav ntawm HPMC. Kab lus no tshawb txog cov xwm txheej no thiab lawv qhov cuam tshuam rau kev tuav dej ntawm HPMC.
Cov yam ntxwv cuam tshuam rau kev tuav dej ntawm HPMC:
1. Molecular Luj:
Qhov hnyav molecular ntawm HPMC cuam tshuam rau nws cov khoom tuav dej. Qhov hnyav dua molecular HPMCs feem ntau pom cov dej tuav tau zoo dua vim lawv cov khoom thickening zoo dua.
Qhov hnyav molecular ntawm HPMC tuaj yeem tswj tau thaum lub sijhawm tsim khoom, thiab cov chaw tsim khoom tuaj yeem tsim cov qib sib txawv ntawm HPMC nrog qhov sib txawv molecular hnyav kom tau raws li cov ntawv thov tshwj xeeb.
2. Kub:
Qhov kub thiab txias yog lwm qhov tseem ceeb cuam tshuam rau kev tuav dej ntawm HPMC. Ntawm qhov kub thiab txias, qhov peev xwm khaws dej ntawm HPMC txo qis, ua rau kev ua haujlwm tsis zoo thiab ua kom lub ntsws nce ntxiv.
Ntawm qhov tod tes, HPMC nthuav tawm cov dej khaws cia zoo dua ntawm qhov kub thiab txias, ua rau nws tsim nyog siv rau hauv huab cua sov thiab lub caij ntuj sov.
3. pH:
Tus nqi pH ntawm ib puag ncig uas HPMC siv kuj yuav cuam tshuam rau nws lub peev xwm tuav dej. HPMC nthuav tawm cov dej khaws cia zoo dua nyob rau hauv nruab nrab lossis me ntsis alkaline pH ib puag ncig.
Nyob rau hauv ib puag ncig acidic, lub peev xwm khaws dej ntawm HPMC txo qis, ua rau kev tsim kho tsis zoo thiab ua rau cov khoom siv tsim kho kom tsawg.
4. Kev noj tshuaj:
Tus nqi ntawm HPMC ntxiv rau cov khoom siv hauv tsev tuaj yeem cuam tshuam rau nws lub peev xwm tuav dej. Qhov txiaj ntsig zoo ntawm HPMC nyob ntawm daim ntawv thov tshwj xeeb thiab lwm yam khoom siv.
Tshaj HPMC yuav ua rau kom muaj viscosity, txo cov txheej txheem thiab nce shrinkage. Ntawm qhov tod tes, qhov tsis txaus ntawm HPMC ua rau cov dej khaws cia tsis zoo, uas ua rau txo qis zog thiab ua kom tawg ntxiv.
5. Lub sij hawm stirring:
Lub sijhawm sib xyaw ntawm HPMC nrog cov khoom siv hauv tsev kuj cuam tshuam rau nws lub peev xwm tuav dej. Lub sijhawm sib xyaw txaus tuaj yeem ua kom muaj kev sib cais ntawm HPMC cov khoom thiab khaws cov dej zoo dua.
Lub sijhawm sib xyaw tsis txaus tuaj yeem ua rau tsis zoo particle faib ntawm HPMC, uas tuaj yeem ua rau txo cov dej tuav thiab lwm yam teeb meem kev ua haujlwm.
6. Hom khoom siv hauv tsev:
Hom kev tsim khoom siv hauv HPMC kuj cuam tshuam rau nws lub peev xwm tuav dej. Cov ntaub ntawv sib txawv xav tau cov dej sib txawv, thiab HPMC tuaj yeem tsim kho kom tau raws li cov khoom siv tshwj xeeb.
Piv txwv li, mortar yuav tsum muaj peev xwm tuav tau dej siab, thaum lub pob zeb yuav tsum muaj peev xwm tuav tau dej tsawg. Yog li ntawd, cov qib sib txawv ntawm HPMC yog tsim rau cov khoom siv sib txawv.
nyob rau hauv xaus:
Hauv cov ntsiab lus, kev tuav dej yog cov cuab yeej tseem ceeb uas txiav txim siab kev ua haujlwm ntawm cov khoom siv hauv tsev. HPMC yog tus neeg saib xyuas dej zoo tshaj plaws, uas tuaj yeem txhim kho cov dej-tswj muaj peev xwm ntawm cov cement, mortar, pob zeb thiab lwm yam khoom siv hauv tsev.
Txawm li cas los xij, ntau yam, xws li qhov hnyav molecular, qhov kub thiab txias, pH, ntau npaum li cas, lub sijhawm sib xyaw, thiab hom kev tsim khoom siv hauv HPMC, tuaj yeem cuam tshuam rau nws cov khoom tuav dej.
Cov neeg tsim khoom yuav tsum xav txog cov xwm txheej no thiab kho cov khoom thiab tus nqi ntawm HPMC rau cov ntawv thov tshwj xeeb hauv tsev kom ua tiav cov dej tuav tau zoo thiab lwm yam txiaj ntsig kev ua haujlwm.
Post lub sij hawm: Aug-08-2023