Producing Hydroxypropyl Methylcellulose (HPMC) involves several intricate steps that transform cellulose into a versatile polymer with a wide range of applications in various industries. Tus txheej txheem no feem ntau pib nrog kev rho tawm ntawm cellulose los ntawm cov khoom siv cog qoob loo los qhia txog hydroxypropyl thiab methyl pawg mus rau lub cellulose. Lub txiaj ntsig HPMC polymer muaj cov khoom tshwj xeeb xws li thickening, khi, zaj duab xis-ua, thiab dej khaws cia. Cia elve rau hauv cov txheej txheem ntawm HPMC ntau lawm.
1. Sourcing raw khoom:
Cov khoom siv thawj rau HPMC ntau lawm yog cellulose, uas yog muab los ntawm cov khoom siv cog xws li cov ntoo ntoo, cov nroj tsuag paj rwb, lossis lwm cov nroj tsuag fibrous. Cov peev txheej no tau xaiv raws li qhov zoo li kev coj dawb huv, cov ntsiab lus cellulose, thiab kev ruaj ntseg.
2. Cellulose rho tawm:
Cellulose tau muab rho tawm los ntawm cov kev xaiv cov nroj tsuag-raws li cov khoom los ntawm cov txheej txheem ntawm cov neeg kho tshuab thiab cov txheej txheem tshuaj lom neeg. Thaum pib, cov khoom siv raw undergoes pretrice, uas yuav muaj kev ntxuav, sib tsoo, thiab kom tshem tawm impurities thiab noo noo. Tom qab ntawd, lub cellulose yog feem ntau kho nrog cov tshuaj lom xws li alkalis lossis acids kom tawg mus rau tom Lignin thiab Hemicellulose, tawm hauv qab cellulose fibulose.
3. Ethetification:
Etheration yog tus txheej txheem tshuaj tseem ceeb hauv HPMC ntau lawm, qhov twg hydroxyproyllots, qhov chaw methyl pawg tau qhia rau lub cellulose caj qaum. Cov kauj ruam no yog qhov tseem ceeb rau kev hloov kho cov khoom ntawm cellulose kom ua tiav cov haujlwm uas xav tau ntawm HPMC. Ethegation yog feem ntau nqa tawm los ntawm cov tshuaj tiv thaiv ntawm cov propylene oxide (rau methyl pawg) nyob rau hauv lub xub ntiag (rau methyl pawg) nyob rau hauv lub xub ntiag (rau cov pab methylropalyl) nyob rau hauv lub xub ntiag (rau methyl pawg) nyob rau hauv lub xub ntiag (rau methyl pawg) nyob rau hauv lub xub ntiag (rau cov pab methylropalyl) nyob rau hauv lub xub ntiag (rau methyl pawg) nyob rau hauv lub xub ntiag (rau cov pab methylropalyl) nyob rau hauv lub xub ntiag (rau cov pab metyl
4. Neutralization thiab Ntxuav:
Tom qab etherification, cov tshuaj tiv thaiv sib tov yog neutralized los tshem tawm cov khoom seem alkali thiab kho cov ph theem. Qhov no feem ntau yog ua los ntawm kev ntxiv cov kua qaub lossis hauv paus nyob ntawm cov tshuaj tiv thaiv tshwj xeeb. Neutralation yog ua raws li los ntawm kev ntxuav kom huv si kom tshem tawm cov khoom lag luam, siv cov tshuaj, thiab cov khoom siv hluav taws xob los ntawm HPMC cov khoom lag luam.
5. Pom thiab ziab:
Qhov nruab nrab thiab ntxuav HPMC tsis txaus ntseeg kom cais cov khoom thiab ua tiav cov kev daws teeb meem meej. Kev txiav txim siab yuav tuaj yeem koom nrog ntau txoj hauv kev xws li lub tshuab nqus tsev los yog centrifugation. Thaum cov kev daws teeb meem tau hais meej, nws tau qhuav rau tshem dej thiab tau HPMC hauv cov hmoov hmoov. Cov kev ziab yuav suav nrog kev muab tshuaj tsuag kom qhuav, ziab pw kom qhuav, los yog nruas kom qhuav, nyob ntawm qhov ntsuas qhov loj me thiab thaj chaw ntawm cov khoom kawg.
6. Sib Tsoo thiab Sieving (Yeem):
Hauv qee kis, cov hmoov hapm qhuav yuav dhau mus xws li sib tsoo thiab sieving kom ua tiav qhov ntau thiab tsawg thiab ua kom zoo dua. Cov kauj ruam no yuav pab tau HPMC nrog tus yam ntxwv lub cev sib xws haum rau ntau yam kev siv.
7. Tswjhwm:
Thoob plaws hauv cov txheej txheem ntau lawm, nyuaj tswj kev ntsuas tau ua tiav los xyuas kom meej meej, xwm yeem, thiab kev ua haujlwm ntawm HPMC khoom. Kev tswj kom zoo yuav suav nrog viscosity, particle loj faib, cov ntsiab lus noo, degree ntawm hloov (DS), thiab lwm yam khoom muaj feem cuam tshuam. Kev ntsuas kev tshuaj xyuas xws li viscosity ntsuas, spectroscopy, chromatography, thiab me me tau siv rau kev ntsuas zoo.
8. Ntim thiab cia:
Thaum lub HPMC cov khoom lag luam dhau los tswj kev ntsuas zoo, nws tau ntim rau hauv cov hnab ntim khoom uas tsim nyog xws li hnab lossis cov nruas thiab sau npe raws li cov lus qhia tshwj xeeb. Cov ntim ntim kom tsim kom tiv thaiv HPMC los ntawm noo noo, paug, thiab lub cev puas thaum lub sijhawm cia thiab tsheb thauj mus los. Lub pob ntawv HPMC tau muab khaws cia rau hauv kev tswj hwm cov xwm txheej los tswj nws cov ruaj khov thiab lub neej - nws tau npaj rau kev xa khoom thiab siv.
Cov ntawv thov ntawm HPMC:
HydroxyPropyf methylcellulose pom ntau ntau yam kev lag luam, kev tsim kho, khoom noj, tshuaj pleev ib ce, thiab cov khoom tu tus kheej. Hauv cov kws tshuaj, nws yog siv los ua cov phau ntawv, ua txhaum, zaj duab xis yav tas los, thiab tus neeg sawv cev tso tawm hauv cov ntsiav tshuaj ua qauv. Nyob rau hauv kev tsim kho, HPMC tau ua haujlwm ua cov tuab dua, thiab rheology modify mortars, plasters, thiab pobzeb cov nplaum. Hauv cov khoom noj, nws pabcuam ua cov tuab, stabilizer, thiab emulsifier hauv cov khoom lag luam xws li cov kua ntses, kua zaub, thiab khoom qab zib. Tsis tas li ntawd, HPMC tau siv rau hauv cov tshuaj pleev ib ce thiab cov khoom tu tus kheej rau nws cov yeeb yaj kiab-ua yeeb yaj kiab, moisturizing, thiab kev ntxhib los mos.
Kev txiav txim siab ib puag ncig:
Kev tsim HPMC, zoo li ntau cov txheej txheem muaj, muaj kev cuam tshuam ib puag ncig. Kev siv zog ua kom tau los txhim kho cov khoom siv HPMC dhau los ntawm kev siv hluav taws xob rawnectable, thiab siv eco-phooj ywg tsim thev naus laus zis. Tsis tas li ntawd, kev txhim kho ntawm Bio-based HPMC muab tau los ntawm kev ua kom ruaj khov xws li cov kab ke algae lossis microbial fermentation qhia cov kev taug kev ib puag ncig ntawm HPMC ntau lawm.
Kev tsim cov hydroxypropyl methylculose cuam tshuam nrog cov kauj ruam pib los ntawm cellulose rho tawm kev hloov kho cov tshuaj, kev ua kom huv, thiab tswj kev zoo. Lub txiaj ntsig HPMC Polymer muaj ntau txoj kev ua haujlwm thiab nrhiav cov ntawv thov hauv kev lag luam ntau yam. Kev siv zog ntawm kev ruaj khov thiab ib puag ncig lub luag haujlwm yog tsav tsheb ua kom txo nws txoj kev xav tau ib puag ncig thaum sib ntsib kom muaj kev xav tsis thoob rau cov neeg siv hluav taws xob no ntau yam.
Lub Sijhawm Post: Mar-05-2024