ayi 11

nkhani

Viscosity Properties ya Hydroxypropyl Methyl Cellulose

Hydroxypropyl methylcellulose (Mtengo wa HPMC) ndi cellulose yosakanizidwa ndi ayoni, yosungunuka m'madzi.Maonekedwe ndi oyera mpaka achikasu pang'ono ufa kapena granular zinthu, zosakoma, zopanda fungo, zopanda poizoni, zokhazikika pamankhwala, ndipo zimasungunuka m'madzi kuti zikhale zosalala, zowonekera komanso zowoneka bwino.Chimodzi mwazinthu zofunika kwambiri za hydroxypropyl methylcellulose pakugwiritsa ntchito ndikuti zimawonjezera kukhuthala kwamadzimadzi.Kukhuthala kumadalira kuchuluka kwa polymerization (DP) ya chinthucho, kuchuluka kwa cellulose ether mu njira yamadzimadzi, kumeta ubweya, komanso kutentha kwa yankho.Ndi zinthu zina.

01

Mtundu wamadzimadzi wa HPMC wamadzimadzi

Kawirikawiri, kupsyinjika kwamadzimadzi mu kumeta ubweya wa ubweya kumatha kuwonetsedwa ngati ntchito ya kumeta ubweya kokha ƒ(γ), bola ngati sichidalira nthawi.Kutengera ndi mawonekedwe a ƒ(γ), madzi amatha kugawidwa m'mitundu yosiyanasiyana, monga: Newtonian fluids, dilatant fluids, pseudoplastic fluids ndi Bingham plastic fluids.

Ma cellulose ethers amagawidwa m'magulu awiri: imodzi ndi ether yopanda ionic cellulose ether ndipo ina ndi ionic cellulose ether.Kwa rheology ya mitundu iwiri ya cellulose ethers.SC Naik et al.adachita kafukufuku wofananira wathunthu komanso mwadongosolo pa hydroxyethyl cellulose ndi sodium carboxymethyl cellulose solutions.Zotsatira zinawonetsa kuti mayankho onse omwe si a ionic cellulose ether ndi ma ionic cellulose ether solution anali pseudoplastic.Kuyenda, mwachitsanzo, madzi osakhala a Newtonian, amayandikira zakumwa za Newton pazambiri zotsika kwambiri.Pseudoplasticity ya hydroxypropyl methylcellulose solution imagwira ntchito yofunika kwambiri.Mwachitsanzo, pamene ntchito zokutira, chifukwa cha kukameta ubweya kupatulira makhalidwe a amadzimadzi njira, ndi mamasukidwe akayendedwe a yankho amachepetsa ndi kuwonjezeka kukameta ubweya mlingo, amene amathandiza kuti yunifolomu kubalalitsidwa kwa pigment particles, komanso kumawonjezera fluidity wa ❖ kuyanika. .Zotsatira zake ndi zazikulu kwambiri;pamene mpumulo, mamasukidwe akayendedwe a yankho ndi lalikulu, amene bwino kuteteza mafunsidwe a pigment particles ❖ kuyanika.

02

HPMC Viscosity Test Njira

Chizindikiro chofunikira choyezera kukhuthala kwa hydroxypropyl methylcellulose ndi mawonekedwe owoneka bwino a yankho lamadzi.Njira zoyezera za kukhuthala kowoneka bwino nthawi zambiri zimaphatikizapo njira ya capillary viscosity, njira yozungulira yozungulira komanso njira yakugwa ya mpira.

kumene: ndi kukhuthala koonekera, mPa s;K ndi viscometer yokhazikika;d ndi kachulukidwe wa chitsanzo cha yankho pa 20/20 ° C;t ndi nthawi yoti yankho lidutse kumtunda kwa viscometer mpaka pansi, s;Nthawi yomwe mafuta wamba amayenda kudzera pa viscometer imayesedwa.

Komabe, njira yoyezera ndi capillary viscometer ndiyovuta kwambiri.Ma viscosities a ma cellulose ethers ambiri ndi ovuta kusanthula pogwiritsa ntchito capillary viscometer chifukwa mayankhowa ali ndi kuchuluka kwa zinthu zosasungunuka zomwe zimangozindikirika pomwe capillary viscometer yatsekedwa.Choncho, opanga ambiri amagwiritsa ntchito ma viscometers ozungulira kuti athetse khalidwe la hydroxypropyl methylcellulose.Ma viscometer a Brookfield amagwiritsidwa ntchito kwambiri kumayiko akunja, ndipo ma viscometer a NDJ amagwiritsidwa ntchito ku China.

03

Zomwe zimakhudzidwa ndi HPMC viscosity

3.1 Ubale ndi digiri ya aggregation

Pamene magawo ena amakhalabe osasinthika, kukhuthala kwa hydroxypropyl methylcellulose yankho kumayenderana ndi digiri ya polymerization (DP) kapena kulemera kwa maselo kapena unyolo wama cell, ndikuwonjezeka ndi kuchuluka kwa digiri ya polymerization.Izi kwambiri kutchulidwa pa nkhani ya otsika digiri ya polymerization kuposa zinachitikira mkulu digiri ya polymerization.

3.2 Ubale pakati pa viscosity ndi kukhazikika

Kukhuthala kwa hydroxypropyl methylcellulose kumawonjezeka ndikuwonjezeka kwa kuchuluka kwa mankhwalawa mu njira yamadzi.Ngakhale kusintha pang'ono kwa ndende kungayambitse kusintha kwakukulu kwa mamasukidwe akayendedwe.Ndi kukhuthala kwadzina kwa hydroxypropyl methylcellulose Zotsatira za kusintha kwa ndende ya yankho pa mamasukidwe amadzimadzi a yankho zimawonekera kwambiri.

3.3 Ubale pakati pa viscosity ndi shear rate

Hydroxypropyl methylcellulose yankho lamadzimadzi lili ndi kumeta ubweya wa ubweya.Hydroxypropyl methylcellulose yosiyana mwadzina mamasukidwe akayendedwe amakonzedwa mu 2% amadzimadzi njira, ndi mamasukidwe akayendedwe ake pa mitengo kukameta ubweya osiyana amayezedwa motsatana.Zotsatira zake ndi izi Monga momwe tawonetsera pachithunzichi.Pakumeta ubweya wochepa, kukhuthala kwa hydroxypropyl methylcellulose yankho sikunasinthe kwambiri.Ndi kuwonjezeka kwa kumeta ubweya wa ubweya, kukhuthala kwa hydroxypropyl methylcellulose njira yokhala ndi mamasukidwe apamwamba odziwika bwino kunatsika mwachiwonekere, pomwe yankho lokhala ndi mamasukidwe otsika silinachepe mwachiwonekere.

3.4 Ubale pakati pa mamasukidwe akayendedwe ndi kutentha

Kukhuthala kwa njira ya hydroxypropyl methylcellulose kumakhudzidwa kwambiri ndi kutentha.Pamene kutentha kumawonjezeka, kukhuthala kwa yankho kumachepa.Monga momwe tawonetsera pachithunzichi, imakonzedwa mu njira yamadzimadzi yokhala ndi 2%, ndipo kusintha kwa mamasukidwe akayendedwe ndi kuwonjezeka kwa kutentha kumayesedwa.

3.5 Zinthu zina zokopa

Kukhuthala kwa njira yamadzimadzi ya hydroxypropyl methylcellulose kumakhudzidwanso ndi zowonjezera mu yankho, pH mtengo wa yankho, ndi kuwonongeka kwa tizilombo tating'onoting'ono.Kawirikawiri, pofuna kupeza ntchito yabwino ya viscosity kapena kuchepetsa mtengo wogwiritsira ntchito, m'pofunika kuwonjezera zosintha za rheology, monga dongo, dongo losinthidwa, ufa wa polima, starch ether ndi aliphatic copolymer, ku njira yamadzimadzi ya hydroxypropyl methylcellulose., ndi ma electrolyte monga kloridi, bromide, phosphate, nitrate, ndi zina zotero.Zowonjezera izi sizidzangokhudza maonekedwe a viscosity ya yankho lamadzimadzi, komanso zimakhudzanso ntchito zina za hydroxypropyl methylcellulose monga kusunga madzi., sag resistance, etc.

Kukhuthala kwa njira yamadzimadzi ya hydroxypropyl methylcellulose sikumakhudzidwa ndi asidi ndi alkali, ndipo nthawi zambiri imakhala yokhazikika pakati pa 3 mpaka 11. Imatha kupirira kuchuluka kwa asidi ofooka, monga formic acid, acetic acid, phosphoric acid. , boric acid, citric acid, etc. Komabe, asidi wambiri adzachepetsa kukhuthala.Koma caustic soda, potaziyamu hydroxide, laimu madzi, etc. alibe zotsatira pa izo.Poyerekeza ndi ena cellulose ethers, hydroxypropyl methylcellulose amadzimadzi njira ali wabwino antimicrobial bata, chifukwa chachikulu n'chakuti hydroxypropyl methylcellulose ali hydrophobic magulu ndi mkulu mlingo wa m'malo ndi wosabala chotchinga cha magulu Komabe, popeza m'malo zimachitikira kawirikawiri si yunifolomu, unsubstituted anhydroglucose unit. imakokoloka mosavuta ndi tizilombo toyambitsa matenda, zomwe zimapangitsa kuwonongeka kwa mamolekyu a cellulose ether ndi chain scission.Kuchita kwake ndikuti mawonekedwe owoneka bwino amadzimadzi amadzimadzi amachepetsa.Ngati kuli kofunikira kusunga njira yamadzimadzi ya hydroxypropyl methylcellulose kwa nthawi yayitali, tikulimbikitsidwa kuti muwonjezere kuchuluka kwa antifungal agent kuti kukhuthala sikusinthe kwambiri.Posankha anti-fungal agents, preservatives kapena fungicides, muyenera kusamala zachitetezo, ndikusankha zinthu zomwe sizili poizoni m'thupi la munthu, zimakhala ndi zinthu zokhazikika komanso zopanda fungo, monga DOW Chem's AMICAL fungicides, CANGUARD64 preservatives, FUELSAVER bacteria agents. ndi zinthu zina.akhoza kutenga gawo lolingana.


Nthawi yotumiza: Oct-20-2022