Dab tsi yog qhov txawv ntawmHydroxypropyl methylcellulose yog ib qho khoom siv zoo(HPMC) nrog lossis tsis muaj S?
1. HPMC muab faib ua hom instant thiab ceev dispersion hom
HPMC ceev dispersing hom yog suffixed nrog tsab ntawv S. Thaum lub sij hawm ntau lawm, glyoxal yuav tsum tau ntxiv.
HPMC hom instant tsis ntxiv cov ntawv, xws li "100000" yog "100000 viscosity ceev dispersion hom HPMC".
2. Nrog lossis tsis muaj S, cov yam ntxwv sib txawv
HPMC dispersing sai sai hauv dej txias thiab ploj mus rau hauv dej. Lub sijhawm no, cov kua dej tsis muaj viscosity, vim tias HPMC tsuas yog tawg mus rau hauv dej, thiab tsis muaj kev sib cais tiag tiag. Tom qab li ob feeb, cov viscosity ntawm cov kua maj mam nce, tsim cov pob tshab nplaum kua. tuab colloid.
Instant HPMC tuaj yeem tawg sai sai hauv dej kub ntawm li 70 ° C. Thaum qhov kub thiab txias poob rau qee qhov kub, qhov viscosity maj mam tshwm kom txog thaum lub pob tshab viscous colloid tsim.
3. Nrog lossis tsis muaj S, lub hom phiaj sib txawv
Instant HPMC tsuas yog siv tau rau hauv cov hmoov putty thiab mortar. Hauv cov kua nplaum, txheej thiab cov khoom siv tu, clumping yuav tshwm sim thiab siv tsis tau.
Kev tawg sai sai HPMC muaj ntau yam kev siv. Nws tuaj yeem siv rau hauv cov hmoov putty, mortar, kua kua nplaum, xim, thiab cov khoom siv ntxhua khaub ncaws yam tsis muaj contraindications.
Txoj kev tawg
1. Siv cov dej kub uas xav tau, muab tso rau hauv lub thawv thiab kub kom siab tshaj 80 ° C, thiab maj mam ntxiv cov khoom no nyob rau hauv qeeb stirring. Cov cellulose ntab saum dej thaum xub thawj, tab sis maj mam dispersed los ua ib qho slurry. Txias cov tshuaj nrog stirring.
2. Los yog cua sov 1/3 los yog 2/3 ntawm cov dej kub kom siab tshaj 85 ° C, ntxiv cellulose kom tau cov dej kub slurry, ces ntxiv cov dej txias ntxiv, stirring tas li, thiab txias lub resulting sib tov.
3. Cellulose muaj ib tug kuj zoo mesh tooj, thiab tshwm sim raws li ib tug me me particle nyob rau hauv lub uniformly stirred hmoov, thiab nws dissolves sai heev thaum nws ntsib dej los tsim viscosity yuav tsum tau.
4. Ntxiv cellulose maj mam thiab sib npaug ntawm chav tsev kub, thiab ua kom nplawm thaum lub sij hawm ntxiv kom txog thaum muaj cov kua nplaum.
Dab tsi cuam tshuam rau kev tuav dej ntawm hydroxypropyl methylcellulose?
Kev tuav dej ntawm hydroxypropyl methylcellulose HPMC cov khoom nws tus kheej feem ntau cuam tshuam los ntawm cov hauv qab no:
1. Cellulose ether HPMC homogeneity
Lub hom phiaj sib xws HPMC muaj kev faib tawm tsis sib xws ntawm methoxy thiab hydroxypropoxy pawg thiab tuav dej siab.
2. Cellulose ether HPMC thermal gel kub
Qhov siab dua qhov thermal gel kub, qhov siab dua cov dej tuav tus nqi; txwv tsis pub, qhov qis dua tus nqi tuav dej.
3. Cellulose ether HPMC viscosity
Thaum lub viscosity ntawm HPMC nce, cov dej tuav tus nqi kuj nce; Thaum lub viscosity nce mus txog ib theem, qhov nce ntawm cov dej tuav tus nqi yuav maj mam.
Cellulose ether HPMC tus nqi ntxiv
Qhov loj dua qhov ntxiv ntawm cellulose ether HPMC, qhov siab dua cov dej tuav thiab cov dej tuav tau zoo dua.
Nyob rau hauv qhov ntau ntawm 0.25-0.6%, cov dej tuav tus nqi nce sai nrog qhov nce ntawm qhov sib ntxiv; Thaum cov nyiaj ntxiv ntxiv, qhov sib ntxiv ntawm cov dej tuav tau qeeb qeeb.
Post lub sij hawm: Oct-17-2022