Hydroxypropylmethylcellulose (HPMC) yog ib qho cellulose ether uas tau los ntawm cov khoom ntuj xws li ntoo pulp thiab paj rwb linters. Vim nws cov yam ntxwv tshwj xeeb, suav nrog kev yaj dej, muaj peev xwm tuab, cov yam ntxwv tsim zaj duab xis, thiab lwm yam, nws yog siv dav hauv ntau yam lag luam. Ib qho ntawm cov yam tseem ceeb uas yuav tsum xav txog thaum siv HPMC yog nws cov viscosity, uas tuaj yeem cuam tshuam loj heev rau nws cov kev ua tau zoo hauv ntau qhov chaw siv. Hauv tsab xov xwm no, peb tham txog vim li cas cellulose HPMC nrog cov viscosities sib txawv yuav tsum tau xaiv rau ntau qhov chaw siv, thiab yuav ua li cas qhov viscosity raug tuaj yeem pab ua kom zoo dua HPMC kev ua tau zoo.
Viscosity yog qhov ntsuas ntawm cov kua dej tsis kam rau kev ntws thiab yog qhov tseem ceeb uas yuav tsum xav txog thaum tsim cov khoom uas xav tau cov yam ntxwv ntws tshwj xeeb. Viscosity cuam tshuam rau kev ua haujlwm ntawm HPMC vim nws txiav txim siab nws lub peev xwm los tsim cov gels, cuam tshuam rau pH ntawm cov tshuaj, qhov tuab ntawm cov txheej, thiab lwm yam khoom siv lub cev. HPMC muaj nyob rau hauv ntau qib viscosity, cov hom feem ntau yog viscosity qis (LV), viscosity nruab nrab (MV) thiab viscosity siab (HV). Txhua hom no muaj lub hom phiaj tshwj xeeb thiab tsim nyog rau ib puag ncig tshwj xeeb.
Qhov Tsis Muaj Viscosity (LV) HPMC
HPMC uas tsis muaj viscosity ntau muaj qhov hnyav molecular tsawg thiab yooj yim yaj hauv dej. Nws yog hom HPMC feem ntau thiab siv rau hauv ntau yam lag luam suav nrog zaub mov, tshuaj pleev ib ce, kev tsim kho thiab tshuaj. LV HPMC zoo tshaj plaws rau cov ntawv thov uas xav tau cov tshuaj viscosity tsawg mus rau nruab nrab xws li cov gels ntshiab, emulsions thiab xim. LV HPMC kuj tseem siv tau los txuas lub txee lub neej ntawm cov zaub mov, txo qhov syneresis thiab muab cov qauv du.
LV HPMC kuj tseem siv ntau zaus hauv kev lag luam kev tsim kho kom txhim kho kev ua haujlwm ntawm cov ntaub ntawv ua los ntawm cement xws li mortars, grouts thiab vuas nplaum. Nws pab txo cov dej poob hauv cov sib xyaw cement, tiv thaiv kev tawg, thiab ua kom muaj zog ntawm cov ntaub ntawv. LV HPMC kuj tseem siv los ua kom muaj zog thiab ruaj khov ntawm plaster, stucco thiab lwm yam ntaub ntawv cuam tshuam.
Nruab Nrab Viscosity (MV) HPMC
Qhov nruab nrab viscosity HPMC muaj qhov hnyav molecular siab dua LV HPMC thiab tsis tshua yaj hauv dej. Nws feem ntau yog siv rau hauv cov ntawv thov uas xav tau cov tshuaj ntau dua xws li coatings, varnishes thiab inks. MV HPMC muaj kev tswj hwm kev ntws zoo dua thiab cov khoom siv daim ntawv thov dua li LV HPMC, ua rau cov zaj duab xis tuab sib xws thiab sib xws. MV HPMC kuj tseem siv tau rau ntau qhov pH dav dua, muab kev hloov pauv ntxiv rau ntau yam kev siv.
MV HPMC kuj tseem siv dav hauv cov khoom siv tshuaj, xws li cov ntsiav tshuaj tso tawm tswj, vim nws ncua kev yaj thiab yog li ua rau cov khoom xyaw tso tawm ntev dua.
Kev Siv HPMC Siab (HV)
HPMC uas muaj viscosity siab muaj qhov hnyav molecular siab tshaj plaws ntawm peb qib thiab yog qhov tsawg tshaj plaws uas yaj hauv dej. Nws feem ntau yog siv rau hauv cov ntawv thov uas xav tau cov khoom tuab thiab ruaj khov, xws li cov kua ntses, tshuaj pleev thiab gels. HV HPMC pab txhim kho cov qauv thiab viscosity ntawm cov khoom, muab kev paub zoo dua rau tus neeg siv. Nws kuj tseem siv tau los ruaj khov cov emulsions, tiv thaiv kev poob thiab ntev lub neej txee. Tsis tas li ntawd, HV HPMC feem ntau yog siv hauv kev lag luam ntawv los txhim kho daim ntawv lub zog thiab kev luam ntawv.
xaus lus
Qhov viscosity kom raug ntawm HPMC yog qhov tseem ceeb rau kev ua kom nws cov kev ua tau zoo hauv ntau qhov chaw siv. LV HPMC yog qhov zoo tshaj plaws rau cov ntawv thov uas xav tau cov tshuaj viscosity qis mus rau nruab nrab, thaum MV HPMC yog qhov tsim nyog rau cov tshuaj tuab xws li xim, varnishes thiab inks. Thaum kawg, HV HPMC yog qhov tsim nyog rau cov ntawv thov uas xav tau cov khoom tuab thiab ruaj khov xws li creams, gels thiab sauces. Kev xaiv qhov viscosity kom raug tuaj yeem pab txhim kho kev ua tau zoo ntawm HPMC thiab ua rau nws haum rau ntau daim ntawv thov sib txawv.
Lub sijhawm tshaj tawm: Lub Yim Hli-31-2023