Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer uas tau los ntawm cellulose thiab feem ntau siv rau hauv ntau yam lag luam, suav nrog tshuaj, tshuaj pleev ib ce, thiab zaub mov. Nws yog ib qho polymer uas yaj tau hauv dej uas tuaj yeem yooj yim hydrated los ua cov kua nplaum.
1. Nkag Siab Txog HPMC:
Ua ntej tham txog cov txheej txheem hydration, nws yog ib qho tseem ceeb kom nkag siab txog cov yam ntxwv ntawm HPMC. HPMC yog ib qho polymer semi-synthetic uas yog hydrophilic, txhais tau tias nws muaj zog affinity rau dej. Nws tsim cov pob tshab, yoog tau, thiab ruaj khov gels thaum hydrated, ua rau nws haum rau ntau yam kev siv.
2. Cov Txheej Txheem Ua Kom Dej:
Kev ua kom HPMC noo yog kev faib cov hmoov polymer hauv dej thiab cia nws o los ua cov kua nplaum lossis gel. Nov yog cov lus qhia ib kauj ruam zuj zus rau kev ua kom HPMC noo:
Xaiv Qib Yog:
HPMC muaj nyob rau hauv ntau qib nrog cov qhov hnyav molecular thiab cov qib viscosity sib txawv. Kev xaiv qib tsim nyog nyob ntawm qhov viscosity xav tau ntawm cov tshuaj kawg lossis gel. Cov qib siab dua ntawm cov qib molecular feem ntau ua rau cov tshuaj viscosity siab dua.
Npaj Cov Dej:
Siv dej huv los yog dej deionized rau hydrating HPMC kom ntseeg tau tias tsis muaj cov khoom tsis huv uas yuav cuam tshuam rau cov khoom ntawm cov tshuaj. Qhov kub ntawm cov dej kuj tseem tuaj yeem cuam tshuam rau cov txheej txheem hydration. Feem ntau, siv dej kub hauv chav tsev txaus, tab sis cua sov dej me ntsis tuaj yeem ua kom cov txheej txheem hydration sai dua.
Kev tawg tawm:
Maj mam muab cov hmoov HPMC nchuav rau hauv dej thaum do tas li kom tiv thaiv kev tsim cov pob. Nws yog ib qho tseem ceeb kom ntxiv cov polymer maj mam kom ntseeg tau tias muaj kev sib kis zoo thiab tiv thaiv kev sib sau ua ke.
Kev Haus Dej:
Txuas ntxiv do cov khoom sib tov kom txog thaum tag nrho cov hmoov HPMC tau tawg rau hauv dej. Cia cov khoom sib tov sawv ntsug rau lub sijhawm txaus kom cov khoom polymer o thiab hydrate tag nrho. Lub sijhawm hydration tuaj yeem sib txawv nyob ntawm cov yam xws li kub, qib polymer, thiab viscosity xav tau.
Kev sib xyaw thiab homogenization:
Tom qab lub sijhawm hydration, sib tov cov tshuaj kom huv si kom ntseeg tau tias sib xws. Nyob ntawm seb daim ntawv thov li cas, yuav tsum tau sib tov ntxiv lossis homogenization kom ua tiav qhov sib xws xav tau thiab tshem tawm cov pob uas tseem tshuav.
Kho pH thiab Cov Khoom Ntxiv (yog tias tsim nyog):
Nyob ntawm seb daim ntawv thov twg, tej zaum koj yuav tsum tau kho qhov pH ntawm cov tshuaj siv cov kua qaub lossis cov hauv paus. Tsis tas li ntawd, lwm yam khoom ntxiv xws li cov tshuaj preservatives, plasticizers, lossis thickeners yuav raug ntxiv rau hauv cov tshuaj ntawm theem no kom txhim kho nws cov kev ua tau zoo lossis kev ruaj khov.
Kev lim dej (yog tias tsim nyog):
Qee zaum, tshwj xeeb tshaj yog hauv kev siv tshuaj lossis kev kho kom zoo nkauj, kev lim cov kua dej uas muaj dej yuav tsum tau tshem tawm cov khoom me me lossis cov khoom tsis huv uas tsis tau yaj, ua rau cov khoom meej thiab sib xws.
3. Cov ntawv thov ntawm Hydrated HPMC:
Hydrated HPMC pom cov ntawv thov hauv ntau yam lag luam:
- Kev Lag Luam Tshuaj: Hauv cov tshuaj tsim, hydrated HPMC yog siv los ua tus neeg sawv cev tuab, binder, thiab tus neeg sawv cev tsim zaj duab xis hauv cov tshuaj pleev xim.
- Kev Lag Luam Tshuaj Pleev Xim: HPMC feem ntau siv rau hauv cov khoom siv pleev xim xws li tshuaj pleev, tshuaj pleev, thiab cov gels ua cov khoom ua kom tuab, cov khoom ruaj khov, thiab cov neeg sawv cev ua zaj duab xis.
- Kev Lag Luam Khoom Noj: Hauv kev lag luam khoom noj, hydrated HPMC yog siv los ua cov khoom ua kom tuab, emulsifier, thiab stabilizer hauv cov khoom xws li cov kua ntses, cov khaub ncaws hnav, thiab cov khoom noj mis nyuj.
- Kev Lag Luam Tsim Kho: HPMC siv rau hauv cov ntaub ntawv tsim kho xws li cov mortars, grouts, thiab cov nplaum pobzeb kom txhim kho kev ua haujlwm, kev khaws dej, thiab kev nplaum.
4. Xaus Lus:
Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer uas muaj ntau yam uas yooj yim hydrated los ua cov kua nplaum lossis gels. Cov txheej txheem hydration cuam tshuam nrog kev faib HPMC hmoov hauv dej, cia nws o, thiab sib tov kom ua tiav qhov sib xws. Hydrated HPMC pom cov ntawv thov hauv ntau yam lag luam, suav nrog tshuaj, tshuaj pleev ib ce, khoom noj, thiab kev tsim kho. Kev nkag siab txog cov txheej txheem hydration thiab cov khoom ntawm HPMC yog qhov tseem ceeb rau kev ua kom zoo dua nws cov kev ua tau zoo hauv ntau daim ntawv thov.
Lub sijhawm tshaj tawm: Lub Peb Hlis-19-2024