HPMC lossis HydroxyPropyyl methylulose yog ib qho khoom siv ntau yam hauv ntau yam kev lag luam suav nrog kev lag luam suav nrog cov kws tshuaj, tshuaj pleev ib ce thiab khoom noj. Nws yog dav siv los ua cov tuab thiab emulsifier, thiab nws viscosity hloov nyob ntawm qhov kub nws yog nthuav tawm Hauv tsab xov xwm no, peb yuav tsom rau kev sib raug zoo ntawm viscosity thiab qhov kub ntawm HPMC.
Viscosity txhais tau tias yog kev ntsuas ntawm cov kua ua kom tsis kam mus ntws. HPMC yog cov khoom lag luam ib nrab uas nws txoj kev ntsuas kev tiv thaiv tsis kam nyob ntawm ntau yam, suav nrog kub. Txhawm rau nkag siab txog kev sib raug zoo ntawm viscosity thiab qhov kub nyob hauv HPMC, peb xub xav paub txog cov tshuaj uas tsim thiab nws yog dab tsi ua los ntawm.
HPMC yog muab tau los ntawm cellulose, ib qho tshwm sim polymer hauv cov nroj tsuag. Txhawm rau tsim HPMC, cellulose yuav tsum tau siv tshuaj hloov kho nrog cov tshuaj pleev cov tshuaj pleev thiab methyl chloride. Qhov kev hloov kho tshiab no ua rau muaj kev tsim ntawm hydroxypropyl thiab methyl ether cov pab pawg nyob rau hauv lub cellulose cov saw hlau. Qhov tshwm sim yog ib qho khoom siv ib nrab uas tuaj yeem ua rau dej thiab siv ntau yam kev siv, suav nrog cov tshuaj pleev ib ce thiab ua ib qho tuab neeg noj tshuaj rau cov khoom noj, ntawm lwm tus.
Lub viscos ntawm HPMC nyob ntawm cov kev xav ntawm cov tshuaj thiab qhov ntsuas kub uas nws raug. Feem ntau, lub viscosity ntawm HPMC txo qis nrog kev nce siab. Qhov no txhais tau tias ntau dua HPMC ua kom muaj vascosities tsawg thiab lwm yam vicea.
Txawm li cas los xij, cov kev sib txuas ntawm viscosity thiab qhov kub muaj ntau nyuab. Raws li tau hais ua ntej, lub viscosity ntawm HPMC nce nrog qhov ntsuas kub tsawg zuj zus. Qhov no txhais tau tias thaum HPMC yog raug rau tsawg kub, nws lub peev xwm ntws txo qis thiab nws yuav muaj viscous ntau dua. Ib yam li ntawd, thaum HPMC raug rau qhov kub thiab txias, nws lub peev xwm ntws nce ntxiv thiab nws viscosity txo.
Muaj ntau yam cuam tshuam uas cuam tshuam rau kev sib raug zoo ntawm qhov kub thiab txias thiab viscosity hauv HPMC. Piv txwv li, lwm cov sign internet tuaj yeem cuam tshuam rau viscosity, raws li muaj peev xwm pH ntawm cov kua. Feem ntau, txawm li cas los xij, muaj qhov kev sib txuas ntawm viscosity thiab qhov kub thiab txias nyob rau hauv hydrogen kev sib txuas thiab kev sib txuas lus molcular ntawm cov saw hlau hauv HPMC.
Thaum HPMC yog raug rau tsawg kub, lub cellulose chains ua ntau dua li ntau, uas ua rau muaj kev sib raug zoo hydrogen. Cov khoom phem helogen no ua rau cov tshuaj tiv thaiv ntws tawm, yog li nce nws viscosity. Hloov siab, thaum HPMC tau raug rau qhov kub thiab txias, lub cellulose saw tau yoog tau yooj yim, uas ua rau tsawg dua hydrogen bonds. Qhov no txo cov tshuaj tiv thaiv tawm tsam kom ntws, ua rau muaj viscosity qis.
Nws yog tsim nyog sau tseg tias thaum muaj feem ntau muaj kev sib txuas ntawm viscosity thiab qhov kub ntawm HPMC, qhov no tsis yog ib txwm muaj rau txhua hom HPMC. Qhov tseeb kev sib raug zoo ntawm viscosity thiab qhov kub yuav sib txawv nyob ntawm kev tsim khoom thiab qib tshwj xeeb ntawm HPMC siv.
HPMC yog cov tshuaj yeeb tshuaj ntau ntau tau siv nyob rau hauv ntau yam kev lag luam rau nws cov thickening thiab emulsifying zog. Lub visccosity ntawm HPMC nyob ntawm ntau yam, suav nrog kev xav txog cov tshuaj thiab qhov ntsuas kub uas nws raug. Feem ntau, lub viscosity ntawm HPMC yog inversely proportional kom kub, uas txhais tau tias qhov ntsuas kub, qhov viscosity nce. Qhov no yog vim muaj qhov cuam tshuam ntawm qhov kub ntawm hydrogen tsev thiab kev sib txuas lus molecular ntawm lub cellulose saw hauv HPMC.
Lub sijhawm Post: Sep-08-2023