HydroxyPropyyl methylcellulose (HPMC)Yog cov dej ntau ntau-dej-soluble sib txuas siv dav siv nyob rau hauv kev tsim kho, tshuaj, tshuaj pleev ib ce, kev lag luam roj av. Nws yog raws ntawm cov nroj tsuag cellulose thiab yog tau los ntawm kev siv tshuaj lom neeg. Nws muaj cov dej zoo solubility, thickening, zaj duab xis-ua thiab nplaum cov khoom. Kev lag luam tsim ntawm Kimacell®hpmc tsuas yog cuam tshuam nrog kev hloov tshuaj tiv thaiv ntawm cellulose. Cov kev hloov kho ib txwm muaj muaj methylation thiab hydroxypropy.
1. Cov ntaub ntawv nyoos thiab Pretreatment ntawm HPMC
Cellulose raw cov ntaub ntawv: zus tau ntau lawm HPMC pib nrog cov cellulose ntuj. Cov chaw seem suav nrog cov fibers nroj tsuag xws li ntoo pulp, paj rwb, thiab hemp. Txhawm rau kom ntseeg tau tias qhov kev kawm du tau, cellulose feem ntau yuav tsum tau ua kom tshem tawm cov impurities thiab kev ua haujlwm ntxiv.
Cov kauj ruam ua ntej: qhov pretreaticment ntawm cellulose feem ntau suav nrog kev ntxuav, thiab crutring rau txheej txheem cellulose rau hauv mranulose los yog hmoov daim ntawv rau cov tshuaj lom neeg ntxiv.
2. Cov txheej txheem hluavtaws ntawm HPMC
Cov txheej txheem ntawm HPMC tsuas yog suav nrog methylation thiab hydroxypropration, uas tau ua raws li kev mob alkaline. Cov txheej txheem tshwj xeeb ntau lawm suav nrog cov kauj ruam hauv qab no:
Kev ua kom ua kom muaj cov cellulose: txhawm rau ua kom cov cellulose tau yooj yim dua los kho cellulose nrog sorium hydroxide (Naoh) kom tau txais lub cellulose hauv cellulose matrix. Nyob rau theem no, lub crystallinity ntawm cellulose tsawg dua thiab tus qauv ua kom xoob, uas yog pab tau rau kev hloov kho tshuaj ntxiv.
Methylation Cov Neeg Tshaj Tawm: cov tshuaj tiv thaiv methylation hloov kho lub cellulose molecule los ntawm kev qhia methyl (-ch₃) pawg. Cov neeg sawv cev siv me me siv yog methyl chloride (ch₃cl) lossis ccoroform (chold Nyob rau hauv lub xub ntiag hydroxide, lub methylating tus neeg sawv cev rov qab nrog cov cellulose los hloov qee pab pawg hydroxule nrog cov methyl pawg (-ch ing
HydroxyPropation Cov: Tom qab methylation ua tiav, propylene oxide (po) feem ntau yog siv los ua ib tug reactant los qhia ib pab hydroxypropylropyl). Cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv alkaline tej yam kev mob. Cov tshuaj hydroxyprropernation hloov qee cov methoxy pawg ntawm cellulose molecule nrog hydroxyproproutyl, yog li kev sib sau HPMC.
Cov tshuaj tiv thaiv kev tswj hwm: thaum tag nrho cov txheej txheem, ntsuas kub, qib ntawm methylore yuav tsum tau hais tias muaj methylation uas yuav tsum tau tswj hwm kom paub tseeb tias muaj methylation uas yuav tsum tau tswj hwm kom paub tseeb tias yog methacell® Feem ntau hais lus, cov tshuaj tiv thaiv kub yog tswj kub ntawm 30 thiab 80 ° C, thiab lub sijhawm tshuaj tiv thaiv muaj ntau teev los ntawm ob peb teev mus rau ntau tshaj kaum teev.
Kev nruab nrab thiab cov tshuaj tiv thaiv: Tom qab cov tshuaj tiv thaiv tiav, cov khoom yuav tsum tau ua kom muaj cov kua qaub (xws li cov kua acidic acid, thiab lwm yam. Cov kauj ruam lim dej suav nrog kev ntxuav, lim, kom qhuav thiab lwm cov txheej txheem kom tshem tawm cov ntaub ntawv raw, cov kuab tshuaj thiab cov khoom lag luam.
3. Khoom Siv Kom Qhuav Thiab Ntim
Kom qhuav: lub huv HPMC feem ntau muaj nyob rau hauv daim ntawv ntawm dej-soluble hmoov, thiab noo noo yuav tsum tau muab tshem tawm los ntawm cov tshuaj tua kom qhuav, nqus cua kom qhuav thiab lwm txoj kev. Cov khoom qhuav yuav tsum tau muaj cov ntsiab lus noo noo, feem ntau tswj tau hauv qab 5%, los tiv thaiv cov khoom los ntawm kev tuav thiab deliquescence.
NTIM: Cov neeg ntim tau qhuav: Cov txheej txheem ntim hauv hmoov, thiab cov txheej txheem ntim yuav tsum muaj cov tshuaj noo-pov thawj. Nws yog feem ntau ntim rau hauv cov hnab polyethylene, ntim cov hnab lossis cov hnab ntim lossis ntim hnab kom yooj yim thauj mus los thiab khaws cia.
4. Tswjhwm thiab cov qauv khoom lag luam
Hauv cov txheej txheem ntau lawm ntawm HPMC, tswj nruj me ntsis yog qhov tseem ceeb. Qhov zoo tshaj ntawm HPMC nyob ntawm tsis yog tsuas yog nyob ntawm qhov zoo ntawm raw cov ntaub ntawv, tab sis kuj ntawm cov tshuaj tiv thaiv thiab kev ua haujlwm tom qab ua haujlwm. Cov neeg tsim khoom lag luam feem ntau yuav ua kev soj ntsuam zoo raws li cov qauv hauv cheeb tsam. Cov ntsuas kev ua tau zoo ua tau xws li:
Solubility: HPMC yuav tsum muaj dej so kom zoo, thiab solubility thiab decigolution tus nqi yuav tsum tau raws li cov cai tau ua.
Viscosity: lub viscosity ntawm HPMC cuam tshuam ncaj qha cuam tshuam nws daim ntawv thov cov nyhuv, thiab cov khoom sib txawv muaj cov viscosity xav tau. Cov Vircosity Kev Xeem Txoj Kev Sib Tw suav nrog Brookfield Viscosity homcosity.
Kev coj dawb huv thiab kev tsis txaus ntseeg: lub tshuab los hauv HPMC yuav tsum tau tswj hwm hauv cov khoom uas tau muaj tseeb los xyuas cov khoom siab.
Qhov loj me me: nyob ntawm cov kev xav tau ntawm cov ntawv thov sib txawv, cov particle loj ntawm HPMC yuav txawv, thiab hmoov av yuav muaj cov xwm txheej sib txawv.
5. Daim ntawv thov ntawm HPMC
HPMC yog dav siv nyob rau hauv ntau qhov kev lag luam thiab muaj cov nqi lag luam tseem ceeb.
Kev lag luam kev tsim kho: HPMC tau siv dav ua cov neeg sawv cev thiab dej kom huv, uas tuaj yeem txhim kho kev ua haujlwm thiab dej rov qab ntawm cov ntaub ntawv.
Kws Kev Lag Luam: HPMC muaj cov ntawv thov tseem ceeb hauv cov tshuaj ntsiav tseem muaj cov ntsiav tshuaj plhaub, ntsiav tshuaj nplaum thiab tswj cov neeg nqa tshuaj tawm.
Kev lag luam khoom noj khoom haus: Hauv zaub mov, HPMC yog siv los ua cov tuab, stabilizer, emulsifier, thiab lwm yam ntawm cov zaub mov.
Kev lag luam kom hniav zoo nkauj: HPMC yog siv los ua cov tuab thiab ua yeeb yaj kiab-sib sau tus neeg sawv cev hauv cov tshuaj pleev ib ce, thiab siv hauv kev tsim cov khoom lag luam xws li lotions thiab cream.
Lwm yam teb: Kimacell®Spmc tseem dav siv nyob rau hauv kev lag luam xws li roj av, textiles, thiab txheej.
Kev lag luam ntau lawm ntawmHPMCKev hloov pauv ntawm cov dej-soluble polymer compound nrog ntau cov khoom muaj ntau yam los ntawm kev coj ua tshuaj lom neeg. Los ntawm kev tswj hwm cov tshuaj tiv thaiv thiab cov txheej txheem kev kho mob tom qab, HPMC cov khoom uas tau raws li cov kev thov sib txawv tuaj yeem tau txais. Nrog rau kev siv thoob plaws HPMC, ntau dua thiab ntau txoj kev tsim kho thev naus laus zis yuav txhawb kev txhim kho ntawm nws cov txheej txheem ntau lawm thiab cov khoom lag luam zoo.
Lub Sijhawm Post: Jan-27-2025