I-MC yi-methyl cellulose, efumaneka ngokunyanga umqhaphu ocoliweyo nge-alkali, kusetyenziswa i-methyl chloride njenge-ether etherifying, kwaye kwenziwe i-cellulose ether ngothotho lweempendulo. Ngokubanzi, inqanaba lokutshintshwa yi-1.6 ~ 2.0, kwaye ukunyibilika nako kwahlukile ngeqondo lokutshintshwa kwamanqanaba ahlukeneyo. Ixhomekeke kwi-non-ionic cellulose ether.
(1) Ukugcinwa kwamanzii-methyl cellulosekuxhomekeke kubungakanani bayo bokongeza, ukuxinana, ukucoleka kwamasuntswana kunye nesantya sokunyibilika. Ngokubanzi, ukuba ubungakanani bokongeza bukhulu, ukucoleka buncinci, kwaye ukucoleka kukhulu, izinga lokugcina amanzi liphezulu. Phakathi kwazo, ubungakanani bokongeza bunempembelelo enkulu kwisantya sokugcina amanzi, kwaye inqanaba lokucoleka alilingani nenqanaba lokugcinwa kwamanzi. Isantya sokunyibilika sixhomekeke kakhulu kwinqanaba lokuguqulwa komphezulu wamasuntswana e-cellulose kunye nokucoleka kwamasuntswana. Phakathi kwee-ethers ze-cellulose ezingentla, i-methyl cellulose kunye ne-hydroxypropyl methyl cellulose zinamazinga aphezulu okugcinwa kwamanzi.
(2) I-Methylcellulose iyanyibilika emanzini abandayo, kodwa kunzima ukuyinyibilikisa emanzini ashushu, kwaye isisombululo sayo samanzi sizinzile kakhulu kuluhlu lwe-pH=3~12. Ihambelana kakuhle nesitatshi, i-guar gum, njl.njl. kunye nezinye izinto ezininzi ezibangela ukuba i-surfactants ifikelele kubushushu be-gelation, kwenzeka into yokuba i-gelation ivele.
(3) Utshintsho lobushushu luya kuchaphazela kakhulu izinga lokugcina amanzi le-methyl cellulose. Ngokubanzi, xa ubushushu buphezulu, kokukhona ukugcinwa kwamanzi kuba kubi. Ukuba ubushushu be-mortar budlula ama-40 °C, ukugcinwa kwamanzi kwe-methyl cellulose kuya kuba kubi kakhulu, nto leyo eya kuchaphazela kakhulu ukusebenza kakuhle kwe-mortar.
(4) I-Methyl cellulose inefuthe elikhulu ekusebenzeni nasekunamatheleni kwe-mortar. Igama elithi “Adhesion” apha libhekisa ekunamatheleni okuvakalayo phakathi kwesixhobo sokufaka isicelo somsebenzi kunye ne-substrate yodonga, oko kukuthi, ukumelana nokucheba kwe-mortar. Ukunamathela kukhulu, ukumelana nokucheba kwe-mortar kukhulu, kwaye amandla afunekayo ngabasebenzi kwinkqubo yokusebenzisa nawo makhulu, kwaye ukwakhiwa kwe-mortar kuphantsi. Ukunamathela kwe-Methylcellulose kukwinqanaba eliphakathi kwiimveliso ze-cellulose ether.
I-HPMC yi-hydroxypropyl methyl cellulose, eyi-ether exutyiweyo ye-non-ionic cellulose eyenziwe ngekotoni ecociweyo emva konyango lwe-alkali, kusetyenziswa i-propylene oxide kunye ne-methyl chloride njengee-ethers ezitshisayo, kwaye ngokusebenzisa uthotho lweempendulo. Umlinganiselo wokutshintshwa ngokubanzi yi-1.2 ukuya kwi-2.0. Iimpawu zayo ziyahluka ngokuxhomekeke kumlinganiselo womxholo we-methoxyl kunye nomxholo we-hydroxypropyl.
(1) I-Hydroxypropyl methylcellulose inyibilika lula emanzini abandayo, kodwa iya kujongana nobunzima ekunyibilikeni emanzini ashushu. Kodwa ubushushu bayo be-gelation emanzini ashushu buphezulu kakhulu kunobo be-methyl cellulose. Ukunyibilika emanzini abandayo kuphucuke kakhulu xa kuthelekiswa ne-methyl cellulose.
(2) Ubunzima be-hydroxypropyl methylcellulose bunxulumene nobukhulu bobunzima bayo beemolekyuli, kwaye okukhona ubunzima be-molekyuli bukhulu, kokukhona ubuninzi be-viscosity buphezulu. Ubushushu bukwachaphazela ubushushu bayo, njengoko ubushushu busanda, ubuninzi be-viscosity buyehla. Kodwa ubuninzi be-viscosity abuchaphazeleki kakhulu bubushushu obuphezulu kune-methyl cellulose. Isisombululo sayo sizinzile xa sigcinwa kubushushu begumbi.
(3) I-Hydroxypropyl methylcellulose izinzile kwi-asidi kunye ne-alkali, kwaye isisombululo sayo samanzi sizinzile kakhulu kuluhlu lwe-pH=2~12. I-Caustic soda kunye namanzi ekalika azinampembelelo ingako ekusebenzeni kwayo, kodwa i-alkali inokukhawulezisa ukunyibilika kwayo kwaye yonyuse i-viscosity. I-Hydroxypropyl methylcellulose izinzile kwi-viscosity eqhelekileyo, kodwa xa uxinzelelo lwe-viscosity ye-hydroxypropyl methylcellulose luphezulu, i-viscosity yesisombululo se-hydroxypropyl methylcellulose idla ngokwanda.
(4) Ukugcinwa kwamanzii-hydroxypropyl methylcellulosekuxhomekeke kubungakanani bayo bokongeza, i-viscosity, njl. Izinga lokugcina amanzi phantsi kobungakanani obufanayo bokongeza liphezulu kunele-methyl cellulose.
(5) I-hydroxypropyl methylcellulose ingaxutywa nee-polymer compounds ezinyibilikayo emanzini ukuze zenze isisombululo esinobungqingili obufanayo nobuphezulu. Ezifana ne-polyvinyl alcohol, i-starch ether, i-vegetable gum, njl.
(6) Ukunamathela kwe-hydroxypropyl methylcellulose kulwakhiwo lwe-mortar kuphezulu kunoko kwe-methylcellulose.
(7) I-hydroxypropyl methylcellulose inokumelana ngcono nee-enzymes kune-methylcellulose, kwaye ithuba layo lokubola kwe-enzymatic solution liphantsi kunele-methylcellulose.
Ixesha leposi: Epreli-28-2024