Hydroxypropylmethylcellulose (HPMC) yog ib qho tshuaj sib xyaw ua ke uas muaj ntau yam thiab siv tau rau hauv tsev neeg cellulose ether. Nws yog los ntawm cellulose, ib qho polymer ntuj uas pom muaj nyob rau hauv cov phab ntsa cell ntawm cov nroj tsuag. HPMC siv dav hauv ntau yam lag luam suav nrog tshuaj, khoom noj, kev tsim kho thiab tshuaj pleev ib ce vim nws cov khoom tshwj xeeb thiab ntau yam zoo.
1. Kev lag luam tshuaj:
A. Kev npaj tso tawm tas mus li:
HPMC siv dav hauv kev lag luam tshuaj vim nws muaj peev xwm tsim cov gel matrix thaum hydrated. Cov khoom no yog qhov tshwj xeeb tshaj yog pab tau rau kev tsim cov tshuaj tso tawm ntev. Los ntawm kev tswj cov viscosity thiab gelation ntawm HPMC, cov chaw tsim tshuaj tuaj yeem ua tiav cov qauv tso tawm tshuaj ntev dua, txhim kho kev ua raws li tus neeg mob thiab txo qhov zaus ntawm kev noj tshuaj.
b. Txheej txheej nyias nyias:
HPMC feem ntau siv ua tus neeg sawv cev txheej zaj duab xis rau cov ntsiav tshuaj. Nws muab cov txheej du thiab sib npaug uas ua rau cov ntsiav tshuaj zoo nkauj dua, npog cov saj ntawm cov tshuaj, thiab tiv thaiv nws los ntawm cov yam ntxwv ib puag ncig. Cov yam ntxwv tsim zaj duab xis ntawm HPMC pab txhim kho kev ruaj khov ntawm cov tshuaj thiab kev siv tau hauv lub cev.
C. Kev Xa Tshuaj Tswj:
Qhov biocompatibility thiab inert xwm ntawm HPMC ua rau nws tsim nyog rau kev siv hauv cov txheej txheem xa tshuaj tswj. Nws tuaj yeem siv ua ke nrog lwm cov polymers los hloov kho cov kinetics tso tawm tshuaj, tso cai rau kev tswj hwm qhov tseeb ntawm cov nqi xa tshuaj thiab txo qhov kev pheej hmoo ntawm cov kev mob tshwm sim.
d. Cov ntaub ntawv tais diav:
HPMC ua haujlwm zoo li cov khoom siv khi rau cov ntsiav tshuaj, pab ua kom cov tshuaj nplaum nplaum. Nws ua kom cov khoom xyaw sib xyaw ua ke, ua rau cov ntsiav tshuaj tawv thiab ruaj khov.
2. Kev lag luam zaub mov:
A. Cov khoom ua kom tuab thiab cov neeg sawv cev gelling:
Hauv kev lag luam zaub mov, HPMC siv ua cov khoom ua kom tuab thiab ua kom cov gelling. Nws muab cov zaub mov zoo nkauj thiab txhim kho nws qhov zoo tag nrho. HPMC feem ntau siv rau hauv cov khoom xws li cov kua ntses, kua zaub thiab khoom qab zib kom ua tiav qhov sib xws xav tau.
b. Kev hloov rog:
HPMC siv tau ua cov roj hloov hauv qee yam khoom noj, pab tsim cov roj tsawg lossis tsis muaj roj lwm txoj hauv kev. Qhov no tseem ceeb heev rau kev daws teeb meem kev noj qab haus huv uas cuam tshuam nrog kev noj roj ntau dhau.
C. kev sib xyaw ua ke:
Vim nws cov khoom emulsifying, HPMC yog siv rau hauv kev tsim cov khoom noj emulsified. Nws pab tswj cov emulsions, tiv thaiv kev sib cais theem thiab xyuas kom meej tias cov khoom homogeneous.
d. Tus neeg sawv cev txhuam:
HPMC siv ua tus neeg sawv cev glazing hauv kev lag luam zaub mov los muab cov xim ci ntsa iab thiab pom tseeb rau cov khoom qab zib, txiv hmab txiv ntoo thiab lwm yam khoom noj.
3. Kev lag luam tsim kho:
A. Cov nplaum rau pobzeb:
HPMC yog ib qho khoom xyaw tseem ceeb hauv cov nplaum rau pobzeb thiab ua haujlwm ua tus neeg sawv cev ua kom tuab thiab khaws dej. Nws ua rau kom cov tshuaj nplaum sib txuas ua haujlwm tau zoo dua, ua rau kev tsim kho yooj yim dua thiab txhim kho lub zog sib txuas.
b. Cov tshuaj cement:
Hauv cov cement-based mortars, HPMC yog siv los txhim kho kev tuav dej, kev ua haujlwm tau zoo thiab kev nplaum. Nws pab txhim kho tag nrho cov yam ntxwv ntawm cov mortar, ua rau nws yooj yim dua rau kev tuav thiab xyuas kom meej tias lo rau ntawm qhov chaw zoo dua.
C. Cov tshuaj sib xyaw ua ke:
HPMC raug muab tso rau hauv cov tshuaj sib xyaw ua ke kom tswj tau qhov viscosity thiab txhim kho cov yam ntxwv ntawm kev ntws. Qhov no yog qhov tseem ceeb kom ua tiav qhov chaw du thiab tiaj tus thaum siv rau hauv pem teb.
d. Gypsum thiab stucco:
Ntxiv HPMC rau hauv gypsum thiab stucco formulations txhim kho kev nplaum, kev ua haujlwm tau zoo thiab kev khaws dej. Nws pab txhim kho qhov zoo ntawm qhov chaw tiav, txo qhov yuav muaj kab nrib pleb thiab ua kom ruaj khov.
4. Kev lag luam tshuaj pleev ib ce:
A. Cov tshuaj ua kom tuab hauv cov tshuaj pleev thiab tshuaj pleev:
HPMC feem ntau siv los ua tus neeg sawv cev tuab hauv cov tshuaj pleev ib ce xws li tshuaj pleev thiab tshuaj pleev ib ce. Nws muab cov khoom du thiab mos mos thiab txhim kho nws cov khoom siv.
b. Cov neeg ua yeeb yaj kiab hauv cov khoom tu plaub hau:
Hauv cov khoom siv saib xyuas plaub hau xws li cov tshuaj pleev plaub hau thiab cov tshuaj pleev kom zoo nkauj, HPMC ua haujlwm ua tus neeg sawv cev tsim zaj duab xis. Nws pab tsim cov zaj duab xis uas yoog tau thiab ruaj khov rau ntawm cov plaub hau, pab txhim kho kev tuav thiab kev tswj hwm.
C. Cov tshuaj emulsion stabilizer:
Cov khoom ruaj khov ntawm HPMC ua rau nws muaj txiaj ntsig zoo hauv cov qauv emulsion los tiv thaiv kev sib cais theem thiab xyuas kom meej tias cov khoom ruaj khov dhau sijhawm.
d. Kev tso tawm tshuaj uas tswj tau hauv cov tshuaj pleev:
Ib yam li nws siv rau hauv cov tshuaj, HPMC tuaj yeem siv rau hauv cov tshuaj pleev ib ce kom ua tiav kev tso tawm cov khoom xyaw nquag. Qhov no tseem ceeb heev rau cov khoom siv saib xyuas tawv nqaij uas xav tau kev tso tawm cov tshuaj zoo.
5. Cov txiaj ntsig ntxiv:
A. Kev khaws dej:
HPMC muaj cov khoom zoo heev uas khaws dej tau zoo, ua rau nws muaj txiaj ntsig zoo rau ntau yam kev siv uas tswj cov dej noo yog qhov tseem ceeb. Qhov no yog qhov tshwj xeeb tshaj yog rau qee cov qauv hauv kev lag luam kev tsim kho thiab hauv kev lag luam zaub mov thiab tshuaj pleev ib ce.
b. Kev lwj ntawm lub cev:
HPMC yog ib hom polymer uas lwj tau uas ua raws li qhov kev siv zog ntawm cov khoom siv uas zoo rau ib puag ncig thiab ruaj khov. Nws cov khoom lwj tau txo qhov cuam tshuam rau ib puag ncig, ua rau nws yog thawj qhov kev xaiv rau qee yam kev siv.
C. Kev sib raug zoo nrog lwm cov polymers:
HPMC muaj kev sib raug zoo nrog ntau yam polymers, uas tso cai rau cov kab ke nyuaj kom raug tsim raws li cov kev xav tau tshwj xeeb.
d. Tsis muaj tshuaj lom thiab inert:
HPMC suav tias tsis muaj tshuaj lom thiab inert, ua rau nws muaj kev nyab xeeb rau kev siv hauv tshuaj, khoom noj, tshuaj pleev ib ce thiab lwm yam kev siv uas kev nyab xeeb ntawm cov neeg siv khoom yog qhov tseem ceeb.
Hydroxypropyl methylcellulose (HPMC) sawv tawm hauv ntau yam lag luam ua ib qho tshuaj sib xyaw ua ke uas muaj txiaj ntsig zoo thiab siv tau ntau yam. Nws pab tsim cov txheej txheem tswj kev tso tawm, txhim kho kev ua haujlwm ntawm cov khoom noj thiab cov tshuaj pleev ib ce, thiab txhim kho cov yam ntxwv ntawm cov ntaub ntawv siv hauv kev tsim kho, qhia txog nws qhov kev ua tau zoo thiab qhov tseem ceeb hauv cov txheej txheem tsim khoom niaj hnub. Thaum kev lag luam txuas ntxiv hloov zuj zus, HPMC yuav tseem yog ib qho tseem ceeb hauv kev tsim cov khoom tshiab thiab zoo.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-18-2023