1. Cov Khoom Muag Khoom
Cov qauv tshuaj thiab muaj pes tsawg leegHydroxyPropyyl methylcellulose (HPMC)yog lub cellulose derivative tau los ntawm kev hloov kho tshuaj lom neeg. Nws yog tsim los ntawm cov ntaub ntawv ntawm ntuj los ntawm kev ua, methylation thiab hydroxyprropation. Nyob rau hauv nws cov qauv molecular, lub cellulose pob txha pob khaus txuas nrog los ntawm β-farcosidic Bonds, thiab pawg neeg yog cov methyl) me me (-hydroxypropyl (-c3h7H).
Cov Khoom Siv Lub Cev
Solubility: Kimacell® Puas muaj insoluble hauv dej thiab organic cov kuab tshuaj, tab sis tuaj yeem tsim lub pob tshab colloidal tov hauv dej txias. Nws solubility yog proportional rau cov ntsiab lus ntawm hydroxypropyl thiab methyl hauv lub lwg me me.
Viscosity: kev daws teeb meem ntawm HPMC muaj qee yam viscosity, uas feem ntau nce nrog qhov nce ntawm molecular hnyav. Nws cov viscosity ntau yog dav thiab tuaj yeem hloov kho raws li kev thov kom tau raws li kev yuav tsum tau ua ntawm cov cai sib txawv.
Thermal Stability: HPMC muaj siab thermal ruaj khov, thiab tsis yooj yim rau kev txiav txim siab thaum cua sov.
Cov Khoom Muaj Peev Xwm
Zaj duab xis-ua cov cuab yeej: HPMC muaj cov cuab yeej zoo nkauj-ua kom muaj cov qauv duab liab thiab muaj peev xwm siv los ua cov khoom sib xyaw ua ke hauv cov tshuaj matrix hauv cov yeeb tshuaj tso tawm.
Emulsification thiab ruaj khov: Vim nws cov kev ua si hauv qab, HPMC feem ntau siv hauv emulsions, kev raug tshem tawm, gels thiab lwm yam kev ruaj ntseg los txhim kho kev tsim qauv.
Thickening thiab dej khaws cia: HPMC muaj cov khoom siv thickening zoo thiab tuaj yeem ua rau viscosity ntawm kev daws teeb meem. Ib qho ntxiv, nws tuaj yeem tuav dej hauv tsev, yog li kev txhim kho lub peev xwm ua kom muaj peev xwm los ntawm cov khoom lag luam, thiab yog pom muaj nyob hauv cov tshuaj pleev ib ce thiab tshuaj txhua hnub.
NoniCenticity: raws li kev tsis muaj qhov tsis muaj txiaj ntsig, HPMC tuaj yeem nyob ruaj khov hauv acid, alkali lossis ntsev daws thiab muaj zog yoog.
Chaw thov
Kws Kev Lag Luam: Ua cov khoom siv yeeb tshuaj, nws yog siv los npaj tswj-tso tawm, kev tso tawm-tso tawm thiab txuas ntxiv tso tawm; Nws tseem siv nyob rau hauv kev npaj cov ntsiav tshuaj, tsiav tshuaj thiab cov tshuaj pleev kom zoo rau tshuaj.
Kev lag luam tsim kev tsim kho: Ua ib qho ntxiv, nws txhim kho kev tsim kho cov ntaub ntawv tsim kho cov ntaub ntawv xws li kev tshuaj khib thiab txheej txheem nplaum thiab dej cia.
Kev lag luam khoom noj: siv li thickener, emulsifier thiab tus neeg sawv cev ntawm seasoning, jelly, mis nyuj khov thiab lwm yam khoom.
Kev lag luam tshuaj pleev ib ce: Siv rau hauv cov tshuaj pleev ib ce, daim tawv nqaij, tshuaj txhuam hniav thiab lwm yam khoom los muab viscosity thiab kev ruaj khov.
2. Cov qauv hluavtaws
Cellulose cov txheej txheem synthemes ntawm HPMC thawj zaug yuav tsum tau rho cov cellulose los ntawm cov ntoo ntuj ntoo fibers (xws li ntoo, paj rwb, thiab lwm yam). Feem ntau, impurities thiab tsis yog-cellulose feem xws li ligcev nyob rau hauv cov ntaub ntawv raw yog muab tshem tawm los ntawm cov qauv tshuaj lossis kev siv tshuab. Lub cellulose txheej txheem tsuas yog suav nrog kev soaking, kev kho alkali, tshuaj dawb thiab lwm cov kauj ruam.
ETherification cov tshuaj tiv thaiv ntawm cellulose cellulose cellulose undergened engenfose etherification cov tshuaj tiv thaiv thiab ntxiv cov me me li methyl thiab hydroxypropyl. Etherification tiv thaiv feem ntau tau nqa tawm hauv kev daws teeb meem alkaline, thiab feem ntau siv qhov chaw sawv ntsug muaj xws li methyl), propylene oxide (c3h6o), thiab lwm yam.
Methylation Regenge: cellulose yog siv nrog methylating tus neeg sawv cev (-Oh) hauv cov pawg molecules tau hloov los ntawm methyl pawg (-och3).
HydroxyPropation: Qhia HydroxyPropyl (-C3H7HOH) pawg rau hauv cellulose molecules, cov reagent yog propylene oxide. Nyob rau hauv cov tshuaj tiv thaiv no, qee cov pawg hydroxyl hauv lub cellulose molecules tau hloov los ntawm hydroxypropyloard pawg.
Kev Tiv Thaiv Kev Tiv Thaiv
Qhov kub thiab txias thiab lub sijhawm: etherification tiv thaiv feem ntau nqa tawm ntawm qhov kub ntawm 50-70 ° C, thiab lub sijhawm tshuaj tiv thaiv yog nruab nrab ntawm ob peb teev thiab ntau tshaj kaum teev. Kev ntsuas kub dhau heev yuav ua rau muaj kev ua kom muaj kev ua rau tsis muaj tseeb, thiab qis dhau qhov kub yuav ua rau muaj kev cuam tshuam tsis zoo.
Ph tus nqi tswj: Qhov kev tawm tsam feem ntau tau nqa tawm hauv Alkaline tej yam kev mob, uas pab txhawm rau txhim kho kev ua haujlwm ntawm lub hertification tiv thaiv ntawm Ehere cov tshuaj tiv thaiv.
Tus neeg sawv cev ntawm lub teb chaws muaj peev xwm: kev xav txog ntawm Etherification tus neeg sawv cev muaj qhov tseem ceeb uas cuam tshuam rau cov khoom ntawm cov tshuaj tiv thaiv cov tshuaj tiv thaiv. Ib qho siab dua ntawm Aletherforification Tus Neeg Sawv Cev muaj peev xwm nce qib ntawm hydroxypropyl lossis methylation ntawm cov khoom, yog li kho qhov ua tau zoo ntawm Kimacell®hpmc.
Kev ua kom huv thiab ziab tom qab cov tshuaj tiv thaiv tiav, cov khoom lag luam feem ntau yuav tsum tau ntxuav nrog dej lossis muab cov kuab tshuaj tiv thaiv reagents thiab cov khoom lag luam. Lub lim hpmc yog qhuav kom tau txais hmoov los yog granular kawg cov khoom lag luam.
Molecular hnyav tswj lub sijhawm thaum lub zog hluav taws xob, qhov hnyav molecular ntawm HPMC tuaj yeem tswj hwm los ntawm kev kho cov tshuaj tiv thaiv kab mob (xws li qhov kub thiab reagent siab). HPMC nrog hnyav molecular hnyav sib txawv sib txawv ntawm solubility, thiab lwm yam, yog li hauv cov kev thov ua kom haum tau raug xaiv raws li kev xav tau.
Raws li cov multifunctional polymer cov khoom,HPMCyog siv dav hauv tshuaj, kev tsim kho, khoom noj thiab cov tshuaj pleev ib ce. Nws cov tuab heev thickening, emulsification, dej tuav thiab ua yeeb yaj kiab ua yeeb yam ua rau nws muaj cov khoom siv tseem ceeb muaj kev muaj nuj nqi. Txoj kev sib xyaw ntawm HPMC feem ntau yog los ntawm lub etherification tshuaj tiv thaiv ntawm cellulose. Cov tshuaj tiv thaiv tshwj xeeb (xws li qhov ntsuas kub, pH muaj nuj nqis, reagent concentration, thiab lwm yam) yuav tsum tau tswj tau zoo kom tau txais cov khoom uas ua tau raws li qhov yuav tsum tau ua. Yav tom ntej, cov haujlwm HPMC tuaj yeem txuas ntxiv tau txuas ntxiv hauv ntau thaj teb.
Lub Sijhawm Post: Jan-27-2025