HydroxyPropyyl methylcellulose (HPMC) yog ib qho kev lag luam polymer ntau yam suav nrog cov khoom lag luam suav nrog cov tshuaj, kev tsim kho, khoom noj thiab cov tshuaj pleev ib ce. Qhov sib xyaw ua ke yog synthesized los ntawm cov txheej txheem ntawm cov txheej txheem kev cuam tshuam nrog ntau yam pib cov ntaub ntawv.
Hydroxypropylencellulose yog ib nrab hluavtaws dej-soluble polymer muab tau los ntawm cellulose, lub ntuj polymer pom hauv tsob ntoo phab ntsa. Vim nws cov khoom tshwj xeeb, nws yog feem ntau siv los ua cov tuab, stabilizer, thiab zaj duab xis-ua tus neeg sawv cev hauv kev lag luam ntau yam. HPMC yog tsim los ntawm kev hloov cellulose los ntawm kev siv tshuaj lom neeg qhia hydroxypropylropyl thiab methyl pawg.
Cov Khoom Siv Raw:
1. Cellulose:
Tau qhov twg los: cellulose yog cov khoom siv tseem ceeb rau HPMC thiab yog muab los ntawm cov nroj tsuag fibers, feem ntau ntoo ntoo lossis paj rwb.
Ua: cellulose undergoes invegoes ua kom tawg rau hauv cov chav me, yog li ua cov ntaub ntawv pib rau kev hloov kho ntxiv.
2. Propylene Oxide:
Tau qhov twg los: Propylene Oxide yog qhov tseem ceeb ntawm hydroxypropyl kev hloov kho thiab yog muab tau los ntawm cov tsiaj yug tsiaj.
Ua: Propylene Oxide reacts nrog cellulose nrog cov alkali los qhia cov pab pawg hydroxyprropylroproutyl.
3. Methyl chloride:
Tau qhov twg los: Methyl chloride yog feem ntau tsim los ntawm Methanol, uas tuaj yeem muab tau los ntawm cov roj av lossis roj biomass.
Ua: Methyl chloride yog siv los ua kom muaj kev cuam tshuam nrog cov pab me me los ua pawg methyl los ua cov pab pawg hydroxyprropylormulose.
4. Sodium hydroxide:
Tau qhov twg los: sodium hydroxide, kuj paub tias caustic dej qab zib, yog lub zog muaj zog tsim los ntawm cov hluav taws xob hluav taws xob ntawm cov tshuaj chloride sodium (cov ntsev).
Kev ua: sodium hydroxide yog siv nyob rau hauv Alkali Kev Kho Mob ntawm cellulose los txhawb kev tawm tsam nrog Propylene oxide ntxiv cov pab pawg hydroxypropylropyl.
5. Hydrochloric acid:
Tau qhov twg los: hydrochloric acid yog ib qho los ntawm cov khoom lag luam ntawm ntau cov txheej txheem muaj, xws li chlorine ntau lawm.
Kev Ua: Siv hydrochloric acid mus rau nruab nrab cov tshuaj tiv thaiv sib tov los xyuas kom meej ntev ntev rau thaum HPMC synthesis.
6. Dej:
Tau qhov twg los: Dej yog qhov tseem ceeb tivthaiv hauv HPMC synthesis, ua yeeb yam raws li cov tshuaj tiv thaiv nruab nrab thiab txhawb nqa cov hydrolysis ntawm cellulose.
Kev Ua: Dej siv hauv ntau theem ntawm cov txheej txheem tsim khoom, suav nrog cov hydrolysis ntawm cellulose thiab ntxuav thiab lim cov kauj ruam.
Txheej txheem tsim khoom:
Kev tsim cov khoom siv hydroxyprropylulose cuam tshuam nrog cov kauj ruam, uas cov ntaub ntawv tau hais los saum toj no ua lub luag haujlwm ua lub luag haujlwm hauv synthesis
Yuam sij.
Kev npaj ntawm cellulose:
Cellulose tau sib cais los ntawm cov nroj tsuag fibers (cov ntoo pulp lossis paj rwb) thiab undergoes cov txheej txheem los txo nws cov roj ntsha molecular, ua kom yooj yim dua los hloov kho.
Kev Kho Mob Alkali:
Cellulose tau kho nrog sodium hydroxide los tsim ib qho chaw alkaline ua rau muaj kev tiv thaiv kom muaj tshuaj tiv thaiv kab mob antylene oxide.
Taw qhia rau hydroxypropyl:
Propylene oxide yog ntxiv rau cov cellulose alkali-kho kom qhia cov pab pawg hydroxyproproutyl rau lub cellulose caj qaum.
Methyl qhia:
Methyl Chloride tau qhia rau hauv cov tshuaj tiv thaiv sib tov, ua rau ntxiv ntawm methyl pawg rau cov cellulropylenated cellulropated cellulropated cellulose.
Neutralize:
Siv hydrochloric acid mus rau nruab nrab cov tshuaj tiv thaiv sib xyaw kom ntseeg tau tias cov khoom kawg tsis yog qhov yooj yim.
Ntxuav thiab Purification:
Lub resulting hydroxypropyl methylculose yog ntxuav thiab lim kom tshem tawm impurities, siv cov khoom siv raw thiab cov khoom lag luam.
Drying:
Tom qab ntawd HPMC yog tom qab ntawd qhuav kom tau txais cov khoom kawg, uas yog ib qho dawb rau cov hmoov dawb.
Cov ntawv thov ntawm hydroxypropy kasthylcellose:
HPMC muaj cov ntawv thov hauv ntau qhov kev lag luam vim nws cov khoom tshwj xeeb:
Tshuaj:
Siv raws li cov nplaum, yeeb yaj kiab ua yeeb yaj kiab thiab kev tso tawm-tso tawm matrices hauv kev npaj tshuaj.
Tso:
Siv los ua cov tuab thiab dej tuav cov neeg sawv cev hauv cov khoom noj khoom haus cov khoom noj xws li mortars thiab plasters.
Kev Lag Luam Khoom Noj:
Siv los ua cov tuab yaj ntaub, stabilizer thiab emulsifier hauv cov khoom noj khoom haus, suav nrog cov kua ntses, hnav khaub ncaws, hnav khaub ncaws thiab cov khoom ci.
Tshuaj pleev ib ce:
Siv los ua cov tuab thiab tawv thiab khov kho hauv cov tshuaj pleev ib ce xws li cream thiab muaj cov tshuaj pleev.
Xim thiab pleev xim:
Siv los ua cov tuab thiab rheology kho hauv cov xim pleev xim rau hauv cov xim av thiab pleev xim.
Cov khoom lag luam ntawm tus kheej:
Nws yog ntxiv rau ntau yam khoom siv saib xyuas tus kheej xws li tshuaj zawv plaub hau thiab lub cev ntxuav rau nws cov khoom siv tuab thiab ruaj khov.
Kev txiav txim siab ib puag ncig:
Txawm hais tias HPMC yog siv ntau yam siv ntau ntau zog polymer, ib puag ncig yuav tsum tau txiav txim siab. Qhov ntau lawm HPMC koom nrog kev siv tshuaj lom neeg thiab siv cov roj petrochemical pub. Kev siv zog yuav tshawb nrhiav ntau cov peev txheej ntawm cellulose thiab ua kom cov txheej txheem zoo los txo cov txheej txheem ib puag ncig.
HydroxyPropyyl methylulose yog ib qho tseem ceeb thiab ntau yam polymer nrog ntau cov ntawv thov hauv ntau yam kev lag luam. Cov ntaub ntawv nyoos nrog nyob rau hauv nws cov synthesis muaj xws li cellulose, epylene oxide, sodium acid thiab dej, uas yauv cov khoom lag luam kom muaj cov khoom kawg. Nkag siab cov khoom siv raw thiab kev tsim cov txheej txheem yog qhov tseem ceeb kom nkag siab txog cov khoom siv HPMC thiab tshawb txog cov avenues rau kev ua kom ruaj khov rau yav tom ntej.
Lub Sijhawm Post: Feb-19-2025