Kev tsim Hydroxypropyl Methylcellulose (HPMC) muaj ntau kauj ruam nyuaj uas hloov cellulose mus ua cov polymer uas siv tau ntau yam hauv ntau yam lag luam. Cov txheej txheem no feem ntau pib nrog kev rho tawm cellulose los ntawm cov nroj tsuag, ua raws li kev hloov pauv tshuaj kom qhia cov hydroxypropyl thiab methyl pawg rau ntawm cellulose backbone. Cov polymer HPMC uas tshwm sim muaj cov yam ntxwv tshwj xeeb xws li ua kom tuab, khi, tsim zaj duab xis, thiab khaws dej. Cia peb kawm txog cov txheej txheem ntxaws ntxaws ntawm kev tsim HPMC.
1. Kev Nrhiav Khoom Siv Raw:
Cov khoom siv raw tseem ceeb rau HPMC tsim yog cellulose, uas yog los ntawm cov nroj tsuag xws li ntoo pulp, paj rwb linters, lossis lwm yam nroj tsuag fibrous. Cov peev txheej no raug xaiv raws li cov yam ntxwv xws li kev huv, cov ntsiab lus cellulose, thiab kev ruaj khov.
2. Kev rho tawm cellulose:
Cellulose yog rho tawm los ntawm cov nroj tsuag xaiv los ntawm ntau yam txheej txheem kho tshuab thiab tshuaj lom neeg. Thaum xub thawj, cov khoom siv raw yuav raug kho ua ntej, uas yuav suav nrog kev ntxuav, sib tsoo, thiab ziab kom tshem tawm cov khoom tsis huv thiab cov dej noo. Tom qab ntawd, cov cellulose feem ntau raug kho nrog cov tshuaj xws li alkalis lossis acids kom rhuav tshem lignin thiab hemicellulose, tawm hauv qab cov cellulose ntshiab.
3. Kev sib xyaw ua ke:
Etherification yog cov txheej txheem tshuaj lom neeg tseem ceeb hauv HPMC ntau lawm, qhov twg hydroxypropyl thiab methyl pawg tau qhia rau ntawm cellulose backbone. Cov kauj ruam no yog qhov tseem ceeb rau kev hloov kho cov khoom ntawm cellulose kom ua tiav cov haujlwm xav tau ntawm HPMC. Etherification feem ntau yog ua los ntawm kev sib xyaw ntawm cellulose nrog propylene oxide (rau hydroxypropyl pawg) thiab methyl chloride (rau methyl pawg) nyob rau hauv qhov muaj alkali catalysts nyob rau hauv kev tswj hwm ntawm qhov kub thiab txias thiab siab.
4. Kev Ua Kom Tsis Muaj Kev Cuam Tshuam thiab Kev Ntxuav:
Tom qab etherification, cov tshuaj sib tov yog neutralized kom tshem tawm cov alkali catalysts seem thiab kho pH theem. Qhov no feem ntau yog ua los ntawm kev ntxiv acid lossis base nyob ntawm cov xwm txheej tshwj xeeb. Neutralization yog ua raws li kev ntxuav kom huv si kom tshem tawm cov khoom by-product, cov tshuaj tsis tau ua haujlwm, thiab cov khoom tsis huv ntawm HPMC khoom.
5. Kev lim thiab ziab:
Cov tshuaj HPMC uas tau ntxuav thiab ntxuav lawm yuav raug lim kom cais cov khoom khov thiab ua tiav cov tshuaj meej. Kev lim yuav suav nrog ntau txoj kev xws li kev lim dej nqus tsev lossis centrifugation. Thaum cov tshuaj tau ua kom meej, nws yuav qhuav kom tshem tawm dej thiab tau txais HPMC hauv daim ntawv hmoov. Cov txheej txheem ziab yuav suav nrog kev ziab tshuaj tsuag, kev ziab txaj fluidized, lossis kev ziab nruas, nyob ntawm qhov loj me ntawm cov khoom xav tau thiab cov khoom ntawm cov khoom kawg.
6. Kev Sib Tsoo thiab Kev Sib Tsoo (Xaiv Tau):
Qee zaum, cov hmoov HPMC qhuav yuav raug ua tiav ntxiv xws li kev sib tsoo thiab sieving kom ua tiav cov khoom me me thiab txhim kho kev ntws. Cov kauj ruam no pab kom tau txais HPMC nrog cov yam ntxwv lub cev sib xws uas haum rau ntau yam kev siv.
7. Kev Tswj Xyuas Zoo:
Thoob plaws hauv cov txheej txheem tsim khoom, cov kev ntsuas tswj hwm zoo raug siv los xyuas kom meej tias cov khoom HPMC huv si, sib xws, thiab kev ua tau zoo. Cov kev ntsuas tswj hwm zoo yuav suav nrog viscosity, qhov loj me ntawm cov khoom me me, cov dej noo, qib hloov pauv (DS), thiab lwm yam khoom cuam tshuam. Cov txheej txheem tshuaj xyuas xws li kev ntsuas viscosity, spectroscopy, chromatography, thiab microscopy feem ntau siv rau kev ntsuas zoo.
8. Ntim thiab Khaws Cia:
Thaum cov khoom HPMC dhau qhov kev xeem tswj xyuas zoo, nws raug ntim rau hauv cov thawv tsim nyog xws li hnab lossis nruas thiab sau npe raws li cov lus qhia. Kev ntim khoom kom zoo pab tiv thaiv HPMC ntawm cov dej noo, kev ua qias tuaj, thiab kev puas tsuaj lub cev thaum lub sijhawm khaws cia thiab thauj mus los. HPMC uas tau ntim khoom raug khaws cia rau hauv cov xwm txheej tswj hwm kom tswj tau nws qhov ruaj khov thiab lub sijhawm txee kom txog thaum nws npaj txhij rau kev faib tawm thiab siv.
Cov ntawv thov ntawm HPMC:
Hydroxypropyl Methylcellulose pom muaj kev siv dav hauv ntau yam lag luam suav nrog tshuaj, kev tsim kho, khoom noj, tshuaj pleev ib ce, thiab cov khoom siv tu tus kheej. Hauv kev tsim kho, nws yog siv los ua tus binder, disintegrant, zaj duab xis former, thiab tus neeg sawv cev tso tawm hauv cov tshuaj ntsiav. Hauv kev tsim kho, HPMC yog siv los ua tus thickener, tus neeg sawv cev khaws dej, thiab rheology modifier hauv cov cement-based mortars, plasters, thiab vuas nplaum. Hauv khoom noj, nws ua haujlwm ua tus thickener, stabilizer, thiab emulsifier hauv cov khoom xws li kua ntses, kua zaub, thiab khoom qab zib. Tsis tas li ntawd, HPMC yog siv rau hauv cov tshuaj pleev ib ce thiab cov khoom siv tu tus kheej rau nws cov yeeb yaj kiab-ua, moisturizing, thiab textures-modifying zog.
Kev Xav Txog Ib puag ncig:
Kev tsim cov HPMC, zoo li ntau cov txheej txheem kev lag luam, muaj kev cuam tshuam rau ib puag ncig. Kev siv zog tab tom ua los txhim kho kev ruaj khov ntawm kev tsim khoom HPMC los ntawm kev pib xws li siv cov peev txheej hluav taws xob rov ua dua tshiab, kev siv cov khoom siv raw kom zoo dua, txo cov khib nyiab, thiab kev siv cov thev naus laus zis tsim khoom zoo rau ib puag ncig. Tsis tas li ntawd, kev tsim cov bio-based HPMC uas tau los ntawm cov peev txheej ruaj khov xws li algae lossis microbial fermentation qhia tau cog lus tias yuav txo qhov cuam tshuam ib puag ncig ntawm kev tsim khoom HPMC.
Kev tsim cov Hydroxypropyl Methylcellulose muaj ntau yam kauj ruam pib los ntawm kev rho tawm cellulose mus rau kev hloov kho tshuaj, kev ntxuav, thiab kev tswj xyuas zoo. Cov polymer HPMC uas tshwm sim muaj ntau yam kev ua haujlwm thiab pom cov ntawv thov hauv ntau yam lag luam. Kev siv zog rau kev ruaj khov thiab kev lav phib xaub ib puag ncig yog kev tsav tsheb tshiab hauv kev tsim khoom HPMC, lub hom phiaj kom txo nws cov kev cuam tshuam ib puag ncig thaum ua tau raws li qhov kev thov loj hlob rau cov polymer ntau yam no.
Lub sijhawm tshaj tawm: Lub Peb Hlis-05-2024