Dab tsi yog qhov sib txawv ntawm HPMC thiab MHEC?

HydroxyPropyyl methylulose (HPMC) thiab methylhydroxyethylal cellulose uas tau siv dav hauv ntau yam kev lag luam vim lawv cov khoom tshwj xeeb. Thaum lawv muaj qhov sib xws, lawv kuj nthuav tawm qhov sib txawv tseem ceeb.

HydroxyPropyyl methylcellulose (HPMC):

1. Dememical qauv:
HPMC yog ib nrab hluavtaws polymer muab tau los ntawm cellulose.
Nws muaj cov chav ua dua tshiab ntawm anhydoglulucose txuas rau hydroxypropyl thiab methoxy pawg.

2. Kev Ua Haujlwm:
Dej Solubility: HPMC yog soluble hauv dej thiab yog li ntawd yog siv dav hauv ntau yam qauv.
Zaj duab xis tsim: Nws tuaj yeem ua cov yeeb yaj kiab nyias, ua kom haum rau kev siv cov txheej txheem tiv thaiv uas xav tau cov txheej txheem tiv thaiv.
Thermal Gelling: muaj thermal gelling cov zog, uas tej zaum yuav zoo nyob rau qee cov ntawv thov.

3. Daim ntawv thov:
Kws Tshuaj: siv ua cov xyoob ntoo, yeeb yaj kiab ua yeeb yaj kiab thiab kev tso tawm-tso tawm-tso tawm hauv cov ntsiav tshuaj.
Kev lag luam tsim kev tsim kho: Siv hauv Caas-raws cov pobzeb nplaum, gypsum-based plasters thiab kev qia dub underlayments.
Kev Lag Luam Khoom Noj: Siv raws li thickener thiab stabilizer nyob rau hauv cov zaub mov.

4. Ntau Lawm:
Nws yog tsim los ntawm etherification ntawm cellulose nrog prexeslene oxide thiab methyl chloride.
Cov qib degree hloov pauv (DS) txiav txim siab qhov sib piv ntawm hydroxypropyl thiab methoxy pawg.

Methylhydroxyethylcelleculose (MHEC):

1. Dememical qauv:
MHEC kuj yog lub cellulose derivative nrog hydroxyethyl thiab methoxy cov pab pawg txuas nrog lub cellulose caj qaum.

2. Kev Ua Haujlwm:
Dej solubility: zoo li HPMC, MHEC yog dej soluble, uas ua rau nws cov versatility hauv ntau yam kev siv.
Txhim kho cov dej khaws cia: MHEC feem ntau ua rau muaj dej zoo dua li HPMC.

3. Daim ntawv thov:
Kev lag luam tsim kev tsim kho: dav siv los ua tus neeg sawv cev tuab rau cov tub ntxhais ua ke tuag, cov nplaum sib xyaw thiab cov khoom lag luam gypsum.
Xim thiab pleev xim: Ua raws li cov xim rheology hauv cov xim pleev xim rau hauv cov xim pleev xim rau cov xim thiab pleev xim.
Kws Tshuaj Kho Mob: Siv rau kev tswj cov Tshuaj Tso Hluav Taws Xob.

4. Ntau Lawm:
Tsim los ntawm lub etherification ntawm cellulose nrog methyl chloride thiab ethyl chloride.
Cov qib kawm hloov pauv cuam tshuam rau cov khoom thiab kev ua tau zoo ntawm MHECS.

Qhov sib txawv ntawm HPMC thiab MHEC:

1. Lub Tsib Hlis:
HPMC yog synthesized siv cov epylene oxide thiab methyl chloride.
MHEC yog tsim kev siv methyl chloride thiab Ethyl chloride.

2. Dej khaws cia:
MHEC feem ntau ua rau muaj cov khoom siv kom zoo dua li HPMC.

3. Daim ntawv thov:
Thaum muaj qee qhov sib tshooj, ib daim ntawv thov tshwj xeeb tuaj yeem nyiam ib qho dhau ntawm lwm tus raws nws cov cwj pwm tshwj xeeb.

4. Thermal gelation:
HPMC qhia cov khoom siv hluav taws xob thermogelling, hereas mHEC yuav muaj kev sib tw sib txawv.

HPMC thiab MHEC muaj ntau cov kev siv hauv kev lag luam ntau yam, thiab txhua yam muaj txiaj ntsig zoo. Qhov kev xaiv ntawm lawv nyob ntawm cov ntaub ntawv thov tshwj xeeb thiab yuav tsum tau ua. Txawm hais tias hauv cov tshuaj, kev tsim kho lossis lwm liaj teb, nkag siab txog qhov sib txawv yuav pab txiav txim siab txiav txim siab ua kom tiav rau cov qauv sib txawv thiab cov txheej txheem.