Tus lej pH ntawm HPMC (HydroxyPropyyl methylcelulose) nyob ntawm nws cov kev xav hauv kev daws teeb meem, qhov kub thiab huv thiab huv si ntawm cov dej siv. Feem ntau, tus nqi PH ntawm HPMC hauv cov kua aqueous yog nruab nrab ntawm 5.0, nyob ntawm cov kev sib cais thiab cov kev qhia tshwj xeeb muab los ntawm cov khw.
1. Cov khoom yooj yim ntawm HPMC
HPMC yog qhov tsis-ionic cellulose cellulose derivative feem ntau siv nyob rau hauv cov khoom siv thiab kev ua yeeb yam zoo nkauj, tuab thiab ruaj khov thiab ruaj khov. Nws yog tsis-ionic, soluble hauv dej txias tab sis tsis nyob hauv dej kub, thiab kev daws teeb meem yog feem ntau nruab nrab lossis me ntsis acidic. Hauv cov ntawv thov muaj kev muaj, HPMC yog dav txais tos rau nws txoj kev nyab xeeb thiab cov khoom ruaj khov.
2. Ph Vajlugkub feem ntau ntawm HPMC aqueous daws
Raws li kev kuaj cov ntaub ntawv thiab cov ntaub ntawv tshawb fawb, tus lej PHQU ntawm HPMC hauv cov kev daws teeb meem uas muaj cov ntsiab lus (xws li 1-2%) feem ntau ntawm 5.0 thiab 8.0. Cov lus qhia cov lus tau muab los ntawm cov khw muag khoom feem ntau muab cov ntawv sib xws rau cov neeg siv rau kev xa mus rau cov txheej txheem kev teeb tsa. Piv txwv li, tus nqi PHIB ntawm qee HPMC cov khoom lag luam hauv 0.1% cov tshuaj aqueous yog li 5.5 txog 7.5, uas yog qhov ze rau nruab nrab.
Kev siv hluav taws xob tsawg (<2%), tus nqi PHQU ntawm HPMC tom qab yaj nyob hauv dej feem ntau kaw rau nruab nrab.
Cov kev daws teeb meem siab: Cov kev daws teeb meem, kev daws viscosity nce, tab sis tus nqi PH tseem hloov nyob rau hauv ntau ze ze rau nruab nrab.
Cov nyhuv kub: lub solubility ntawm HPMC tau cuam tshuam heev los ntawm qhov kub. Nws yog yooj yim soluble hauv dej txias thiab yooj yim precipitated nyob rau hauv cov dej kub siab. Thaum npaj HPMC cov tshuaj HPMC, nws yog feem ntau pom zoo kom siv cov dej txias kom tsis txhob muaj kev hloov pauv los ntawm kev kub siab tshaj.
3. PX Tus Nqi Nrhiav Kom Tau thiab Muaj Peev Xwm
Feem ntau, thaum kev tsim khoom thiab siv, thaum pom tus nqi ntawm HPMC aqueous daws, lub ntsuas hluav taws xob pha yog siv rau kev ntsuas ncaj qha. Txawm li cas los xij, cov hauv qab no yuav cuam tshuam cov qhab nia ntsuas:
Cov dej huv: dej los ntawm cov khoom siv sib txawv, cov zaub mov, thiab lwm yam. Feem ntau nws pom zoo los siv dej deionized lossis distilled dej los npaj HPMC daws kom ntseeg tau tias qhov tseeb ntawm cov txiaj ntsig.
Kev daws teeb meem: qhov ntau dua HPMC siab, uas tau coj qee yam kev nyuaj siab rau cov kev ntsuas siab ntev, yog li siv cov kev daws teeb meem.
Sab nraud ib puag ncig: qhov kub thiab txias, ntsuas ntsuas ntsuas cov twj paj nruag, thiab lwm yam tuaj yeem ua rau Phom Me me.
4. Yuav tsum muaj nyob hauv HPMC Daim Ntawv Thov Kev Pab Cuam
Thaum HPMC yog siv nyob rau hauv cov zaub mov thiab tshuaj, nws qhov ruaj khov thiab Phrogility yuav tsum tau txiav txim siab. Piv txwv li, hauv cov ntsiav tshuaj thiab tshuaj pleev cov tshuaj pleev kev npaj, HPMC yog siv los ua cov ntaub ntawv harm, Cov tshuaj feem ntau yuav tsum tau tso tawm nyob rau hauv ib puag ncig-nruab nrab lossis ib puag ncig kua qaub, yog li ntawd lub pH cov yam ntxwv ntawm HPMC yog qhov haum rau lub hom phiaj no.
Kev lag luam khoom noj khoom haus: Thaum HPMC yog siv los ua cov tuab thiab tawv, nws yog feem ntau cia siab tias nws yog qhov tsis cuam tshuam rau qhov saj thiab ruaj khov ntawm cov khoom.
Kws Tshuaj Kho Mob: Hauv cov ntsiav tshuaj thiab cov ntsiav tshuaj, HPMC yog siv los tswj cov tshuaj tawm, thiab muaj feem ruaj khov pab kom txhua yam ntawm cov tshuaj.
5. Kho txoj kev Ph ntawm HPMC aqueous kev daws
Yog tias tus nqi ntawm HPMC yuav tsum hloov pauv hauv ib daim ntawv thov tshwj xeeb, nws tuaj yeem ua tau zoo los ntawm kev ntxiv cov kua qaub lossis alkali. Piv txwv li, ib qho me me ntawm dilute hydrochloric acid lossis sodium hydroxide daws yuav tuaj yeem siv, tab sis nws yuav tsum tau ua tib zoo tswj hwm kev nyab xeeb lossis cuam tshuam rau kev ruaj ntseg ntawm HPMC.
Tus PH tus nqi ntawm HPMC hauv kev daws teeb meem yog feem ntau ntawm 5.0 thiab 8.0, uas yog ze rau nruab nrab. Cov ntawv PHH rau cov txheej txheem thov sib txawv yuav txawv me ntsis, tab sis feem ntau tsis muaj kev hloov tshwj xeeb.
Lub sijhawm Post: Feb-15-2025