Hydroxypropyl methyl cellulose muab faib ua ntau hom, thiab qhov txawv ntawm nws siv yog dab tsi?
HPMC muaj peev xwm muab faib ua hom tam sim ntawd thiab hom kub yaj. Cov khoom tam sim ntawd tawg sai sai hauv dej txias thiab ploj mus rau hauv dej. Lub sijhawm no, cov kua tsis muaj viscosity, vim HPMC tsuas yog tawg hauv dej thiab tsis yaj tiag tiag. Tom qab li 2 feeb (do), qhov viscosity ntawm cov kua maj mam nce, tsim cov pob tshab dawb viscous colloid. Cov khoom kub yaj tuaj yeem tawg sai sai hauv dej kub thiab ploj mus rau hauv dej kub thaum lawv sib sau ua ke hauv dej txias. Thaum qhov kub poob rau qee qhov kub (raws li qhov kub ntawm cov khoom gel), qhov viscosity maj mam tshwm sim kom txog thaum cov pob tshab viscous colloid tsim.
Yuav ua li cas txiav txim siab qhov zoo ntawm hydroxypropyl methyl cellulose yooj yim thiab intuitively?
Kev dawb. Txawm hais tias kev dawb tsis tuaj yeem txiav txim siab seb HPMC puas yooj yim siv, thiab yog tias cov neeg sawv cev dawb ntxiv rau hauv cov txheej txheem ntau lawm, nws yuav cuam tshuam rau nws qhov zoo, feem ntau cov khoom zoo muaj kev dawb zoo.
Kev Zoo: qhov zoo ntawm HPMC feem ntau yog 80 mesh thiab 100 mesh, thiab 120 mesh tsawg dua. Qhov zoo dua qhov zoo dua.
Kev xa hluav taws xob: tom qab HPMC raug muab tso rau hauv dej los ua cov pob tshab colloid, saib nws qhov kev xa hluav taws xob. Qhov kev xa hluav taws xob ntau dua, qhov zoo dua. Nws txhais tau tias muaj cov tshuaj tsis yaj tsawg dua hauv nws. Qhov kev xa hluav taws xob ntawm lub tshuab hluav taws xob ntsug feem ntau zoo, thiab qhov ntawm lub tshuab hluav taws xob kab rov tav yog qhov phem dua. Txawm li cas los xij, nws tsis txhais tau tias qhov zoo ntawm lub tshuab hluav taws xob ntsug zoo dua li ntawm lub tshuab hluav taws xob kab rov tav. Muaj ntau yam uas txiav txim siab qhov zoo ntawm cov khoom.
Qhov hnyav tshwj xeeb: qhov hnyav tshwj xeeb loj dua, qhov hnyav dua, qhov zoo dua. Feem ntau, nws yog vim tias cov ntsiab lus ntawm hydroxypropyl hauv nws siab. Yog tias cov ntsiab lus ntawm hydroxypropyl siab, qhov khaws dej zoo dua.
Qhov hnyav tshwj xeeb: qhov hnyav tshwj xeeb loj dua, qhov hnyav dua, qhov zoo dua. Feem ntau, nws yog vim tias cov ntsiab lus ntawm hydroxypropyl hauv nws siab. Yog tias cov ntsiab lus ntawm hydroxypropyl siab, qhov khaws dej zoo dua.
Cov txheej txheem yaj ntawm hydroxypropyl methyl cellulose yog dab tsi?
Tag nrho cov qauv tuaj yeem ntxiv rau cov ntaub ntawv los ntawm txoj kev sib tov qhuav;
Thaum nws xav tau ntxiv ncaj qha rau hauv cov kua dej ntawm chav tsev kub, nws zoo dua los siv hom dej txias dispersion. Feem ntau, nws tuaj yeem ua kom tuab hauv 10-90 feeb tom qab ntxiv (stirring)
Cov qauv zoo tib yam tuaj yeem yaj tom qab sib tov thiab faib nrog dej kub, ntxiv dej txias, do thiab txias;
Yog tias muaj kev sib xyaw ua ke thiab qhwv thaum lub sijhawm yaj, nws yog vim tsis sib tov txaus lossis cov qauv ib txwm raug ntxiv ncaj qha rau hauv dej txias. Lub sijhawm no, nws yuav tsum tau do sai sai.
Yog tias cov npuas dej tshwm sim thaum lub sijhawm yaj, lawv tuaj yeem tshem tawm los ntawm kev sawv rau 2-12 teev (lub sijhawm tshwj xeeb nyob ntawm qhov sib xws ntawm cov tshuaj), nqus tsev, nias thiab lwm txoj hauv kev, lossis ntxiv cov tshuaj defoamer kom tsim nyog.
Hydroxypropyl methyl cellulose ua lub luag haujlwm dab tsi hauv kev siv cov hmoov putty, thiab seb puas muaj chemistry?
Hauv cov hmoov putty, nws ua peb lub luag haujlwm: ua kom tuab, khaws dej thiab tsim kho. Ua kom tuab, cellulose tuaj yeem ua kom tuab, ua lub luag haujlwm ntawm kev ncua, ua kom cov tshuaj sib xws nce thiab nqis, thiab tiv taus kev sagging. Kev khaws dej: ua kom cov hmoov putty qhuav qeeb, thiab pab cov calcium calcium kom ua haujlwm hauv qab dej. Kev tsim kho: cellulose muaj cov nyhuv lubricating, uas tuaj yeem ua rau cov hmoov putty muaj kev ua haujlwm zoo. HPMC tsis koom nrog hauv kev tshuaj lom neeg, tab sis tsuas yog ua lub luag haujlwm pabcuam.
Qhov kub ntawm hydroxypropyl methyl cellulose hauv gel muaj feem xyuam li cas?
Qhov kub ntawm HPMC hauv gel muaj feem cuam tshuam nrog nws cov ntsiab lus methoxyl. Qhov qis dua ntawm cov ntsiab lus methoxyl, qhov siab dua ntawm qhov kub ntawm gel.
puas muaj kev sib raug zoo ntawm qhov poob ntawm cov hmoov putty thiab hydroxypropyl methyl cellulose?
Nws tseem ceeb !!! HPMC muaj cov dej tsis zoo, uas yuav ua rau cov hmoov poob.
Daim ntawv thov ntawm hydroxypropyl methyl cellulose hauv cov hmoov putty, dab tsi yog qhov laj thawj rau cov npuas hauv cov hmoov putty?
HPMC ua peb lub luag haujlwm hauv cov hmoov putty: thickening, water retention thiab construction. Cov laj thawj rau cov npuas yog raws li nram no:
Ntxiv dej ntau dhau lawm.
Yog koj khawb lwm txheej rau ntawm txheej hauv qab ua ntej nws qhuav, nws kuj yooj yim ua rau blister.
Lub sijhawm tshaj tawm: Cuaj hlis-27-2022