Dab tsi yog cov ntaub ntawv nyoos ntawm HPMC?

HydroxyPropyyl methylcellulose (HPMC) yog cov tshuaj polymer ntau yam hauv ntau yam kev lag luam, suav nrog cov tshuaj, kev tsim kho, thiab tshuaj pleev noj, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev noj, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab cov tshuaj pleev ib ce, thiab tshuaj pleev noj, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev noj, thiab tshuaj pleev ib ce, thiab tshuaj pleev noj, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev noj, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce, thiab tshuaj pleev ib ce. Cov ntaub ntawv raw siv hauv kev tsim HPMC tuaj ntawm natural cov peev txheej thiab txuas dua tshiab.

HPMC yog semisynthetic derivative ntawm cellulose, lub ntuj polymer pom nyob hauv tsob ntoo cell phab ntsa. Cov ntaub ntawv raw ua los ntawm HPMC suav nrog cellulose thiab prant ol oxide. Cov ntaub ntawv raw thiab synthesis tau piav qhia nyob rau hauv kev nthuav dav hauv qab no:

1. Cellulose:

Tau qhov twg los: Cov khoom siv tseem ceeb ntawm HPMC yog cellulose, uas tau muab rho tawm los ntawm ntoo pulp lossis cov paj rwb fiber ntau. Ntoo pulp yog qhov tshwm sim tshaj plaws vim nws cov nplua nuj thiab tus nqi-ua hauj lwm zoo.
Kev sib cais: cais cellulose los ntawm cov ntaub ntawv raw siv ntau yam tshuaj lom neeg thiab cov txheej txheem. Ntoo pulp yog siv tshuaj kho kom tshem tawm impurities thiab extract cellulose fibers.

2. Propylene Oxide:

Tau qhov twg los: Propylene Oxide yog qhov tseem ceeb ntawm cov khoom siv HPMC thiab yog muab los ntawm propylene, ib petrochemical tau txais thaum lub sij hawm crude refining.
Kev tsim khoom: propylene oxide feem ntau yog tsim los ntawm cov txheej txheem tshuaj lom hu ua chlorohydrins lossis epoxidation. Hauv cov txheej txheem no, Propylene rov qab nrog chlorine lossis hydrogen peroxide rau daim ntawv propylene oxide.

3. Methylation Refaulation:

Ethetification: synthesis ntawm HPMC cuam tshuam nrog lub Ericterification ntawm cellulose nrog propylene oxide. Cov txheej txheem no tseem hu ua methylation, uas hydroxyprodropyl pawg tau qhia rau hauv lub cellulose caj qaum.
Kev Kho Mob Alkali: kho cellulose nrog cov alkali (feem ntau sodium hydroxide) kom qhib cov pab pawg hydroxyl. Qhov no ua rau lawv muaj kev cuam tshuam ntau dua thaum lub sijhawm tom ntej ntawm cov tshuaj tiv thaiv nrog propylene oxide.

4. Qib ntawm methylation:

Kev tswj hwm: Tswj cov qib ntawm methylation (DS) thaum lub sij hawm cov tshuaj tiv thaiv kom ua tiav cov khoom xav tau ntawm HPMC. Cov qib kawm ntawv hloov pauv tau cuam tshuam rau cov solubility, viscosity, thiab lwm yam khoom ntawm cov khoom kawg.
HydroxyPropy:

Cov tshuaj tiv thaiv: kev ua haujlwm cellulose yog tom qab ntawd reacted nrog propylene oxide nyob rau hauv cov xwm txheej. Qhov no ua rau cov pab pawg hydroxypropyl ntawm lub cellulose saw.
Qhov kub thiab txias thiab siab: Ua tib zoo tswj cov kev mob, suav nrog qhov kub thiab txias thiab lub siab, kom ntseeg tau cov txheej txheem kev ua haujlwm thiab cov khoom lag luam xaus.

5. Nruab nruab nrab thiab ntxuav:

Acid Neutalization: Tom qab cov tshuaj tiv thaiv, cov khoom yog neutralized nrog ib acid kom tshem tawm cov hauv paus ntau dhau.
Ntxuav: HPMC tau ntxuav kom tshem tawm impurities, siv cov ntaub ntawv siv, thiab cov khoom lag luam. Cov kauj ruam no yog qhov tseem ceeb heev kom tau txais cov khoom lag luam kawg kawg.

6. Kom Qhuav:

Dej tshem tawm: Cov kauj ruam kawg yog kom qhuav HPMC kom tshem tawm cov seem uas ntxiv noo noo. Cov ntaub ntawv HPMC hauv cov hmoov plaub, uas tuaj yeem ua tau txuas ntxiv thiab siv ntau yam kev siv.

Cov ntaub ntawv nyoos ntawm HPMC tsuas yog muab los ntawm ntoo pulp lossis paj rwb fiber ntau thiab propylene oxide muab tau los ntawm petrochemical pranted. Cov txheej txheem hluavtaws suav nrog methylation, hydroxyprore, ntxuav, ntxhua khaub ncaws ua tib zoo tswj kom tau txais cov khoom xav tau ntawm cov polymer. HPMC cov versatility stems los ntawm nws cov qauv tshuaj tshwj xeeb, ua rau nws muaj txiaj ntsig zoo hauv ntau yam khoom.