Hydroxypropyl Methyl Cellulose HPMC
Hydroxypropyl methylcellulose (HPMC), uas tsis yog-ionic cellulose ether, yog muab los ntawm ntuj cellulose los ntawm ib tug nruj series ntawm cov txheej txheem tshuaj. Cov hmoov dawb no yog tus cwj pwm los ntawm nws cov ntxhiab tsw thiab saj tsis zoo, ua rau nws tsis muaj tshuaj lom thiab muaj kev nyab xeeb rau ntau yam kev siv. Ib qho ntawm nws cov yam ntxwv tseem ceeb yog nws lub peev xwm yaj hauv dej txias, ua rau cov kua nplaum pob tshab. HPMC muaj ntau yam kev ua haujlwm zoo, suav nrog kev ua kom tuab, ua kom zoo, tawg, emulsification, thiab muaj peev xwm ua yeeb yaj kiab. Tsis tas li ntawd, nws ua tau zoo hauv kev khaws cia cov dej noo, gelation, thiab kev ua haujlwm saum npoo av, ua rau nws muaj ntau yam sib xyaw thoob plaws ntau yam lag luam, xws li tshuaj, khoom noj khoom haus, kev tsim kho, thiab tshuaj pleev ib ce.
Hauv kev tsim kho, HPMC pom muaj ntau yam ntawm cov ntawv thov tseem ceeb rau kev txhim kho qhov zoo thiab kev ua tau zoo ntawm cov khoom siv hauv tsev. Piv txwv li, thaum muab tso rau hauv cov cement-xuab zeb slurry, HPMC txhim kho cov khoom tawg yooj yim, ua rau cov yas zoo dua qub thiab txhim kho cov dej tuav hauv mortar. Qhov no yog qhov tseem ceeb, vim nws pab tiv thaiv kev tawg ntawm cov qauv, yog li ncua lub neej thiab kev ruaj ntseg ntawm kev tsim kho. Ib yam li ntawd, nyob rau hauv cov ntsiab lus ntawm ceramic pobzeb mortar, HPMC txhim kho tsis tau tsuas yog cov dej tuav tab sis kuj adhesion thiab yas, uas yog ib qho tseem ceeb rau kev siv tau zoo thiab siv tau ntev yam tsis muaj teeb meem ntawm hmoov.
Tsis tas li ntawd, HPMC ua raws li cov kev cai nruj kev nyab xeeb, raug lees paub tias yog cov khoom noj tsis muaj tshuaj lom neeg muaj kev nyab xeeb rau kev noj, tsis muaj caloric nqi thiab tsis ua mob rau daim tawv nqaij thiab mucous daim nyias nyias. Raws li FDA thiab FAO / WHO cov lus qhia, qhov kev tso cai txhua hnub ntawm HPMC tau teeb tsa ntawm 25mg / kg, muab kev lees paub rau nws siv hauv ntau daim ntawv thov. Txawm li cas los xij, kev ceev faj yog tsim nyog thaum tuav HPMC kom muaj kev nyab xeeb thaum nws thov. Nws raug nquahu kom hnav cov iav tiv thaiv, zam kom tsis txhob raug hluav taws kub, thiab txo cov plua plav hauv qhov chaw kaw kom txo tau qhov phom sij tawg. Ntxiv mus, HPMC yuav tsum tau muab khaws cia rau hauv qhov chaw qhuav, qhov cua zoo, tiv thaiv los ntawm tshav ntuj ncaj qha thiab ya raws, nrog rau kev saib xyuas thaum lub sijhawm thauj mus los los tiv thaiv nws los ntawm nag thiab lwm yam huab cua. HPMC tau ntim khoom ruaj ntseg hauv 25 kg hnab ua los ntawm polypropylene, lined nrog polyethylene rau kev tiv thaiv ntxiv, kom ntseeg tau tias cov khoom tseem raug kaw thiab zoo mus txog thaum siv.
