I-MC yi-methyl cellulose, eyenziwe nge-cellulose ether ngokunyanga umqhaphu ocoliweyo nge-alkali, kusetyenziswa i-methane chloride njenge-etherification agent, kwaye idlula kuthotho lweempendulo. Ngokubanzi, inqanaba lokutshintshwa yi-1.6 ~ 2.0, kwaye ukunyibilika nako kwahlukile ngamanqanaba ahlukeneyo okutshintshwa. Yeye-non-ionic cellulose ether.
(1) Ukugcinwa kwamanzi kwe-methyl cellulose kuxhomekeke kubungakanani bayo bokongeza, ukuxinana, ukucoleka kwamasuntswana kunye nesantya sokunyibilika. Ngokubanzi, ukuba ubungakanani bokongeza bukhulu, ukucoleka buncinci, kwaye ukucoleka kukhulu, izinga lokugcinwa kwamanzi liphezulu. Phakathi kwazo, ubungakanani bokongeza bunempembelelo enkulu kwisantya sokugcinwa kwamanzi, kwaye inqanaba lokucoleka alihambelani ngokuthe ngqo 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, kwaye kuya kuba nzima ukuyinyibilikisa emanzini ashushu. Isisombululo sayo samanzi sizinzile kakhulu kuluhlu lwe-pH=3~12. Ihambelana kakuhle nesitatshi, i-guar gum, njl.njl. kunye nezinye izinto ezininzi ezibangela ukunyibilika. Xa ubushushu bufikelela kubushushu be-gelation, i-gelation iyenzeka.
(3) Utshintsho kubushushu 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 kuncipha kakhulu, nto leyo echaphazela kakhulu ukwakhiwa kwe-mortar.
(4) I-Methyl cellulose inefuthe elikhulu ekwakhiweni nasekunamatheleni kwe-mortar. "Ukuncamathela" apha kubhekisa kumandla okuncamathela avakalayo phakathi kwesixhobo sokusebenzisa somsebenzi kunye ne-substrate yodonga, oko kukuthi, ukumelana nokucheba kwe-mortar. Ukuncamathela kuphezulu, ukumelana nokucheba kwe-mortar kukhulu, kwaye amandla afunekayo ngabasebenzi kwinkqubo yokusetyenziswa nawo makhulu, kwaye ukusebenza kokwakhiwa kwe-mortar kuphantsi. Ukunamathela kwe-Methyl cellulose kukwinqanaba eliphakathi kwiimveliso ze-cellulose ether.
I-HPMC yi-hydroxypropyl methylcellulose, eyi-ether exutyiweyo ye-cellulose engeyiyo ionic eyenziwe ngekotoni ecociweyo emva kwe-alkalization, isebenzisa i-propylene oxide kunye ne-methyl chloride njengee-etherification agents, kwaye ngokusebenzisa uthotho lweempendulo. Iqondo lokutshintshwa ngokubanzi yi-1.2 ~ 2.0. Iimpawu zayo zahlukile ngenxa yemilinganiselo eyahlukeneyo yomxholo we-methoxyl kunye nomxholo we-hydroxypropyl.
(1) I-Hydroxypropyl methylcellulose inyibilika lula emanzini abandayo, kwaye iya kujongana nobunzima ekunyibilikeni emanzini ashushu. Kodwa ubushushu bayo be-gelation emanzini ashushu buphezulu kakhulu kunobo be-methyl cellulose. Ukunyibilika emanzini abandayo nako kuphuculwe kakhulu xa kuthelekiswa ne-methyl cellulose.
(2) Ubunzima be-hydroxypropyl methylcellulose bunxulumene nobunzima bayo beemolekyuli, kwaye okukhona ubunzima be-molekyuli bukhulu, kokukhona ubuninzi be-viscosity buphezulu. Ubushushu bukwachaphazela nobunzima bayo, njengoko ubushushu busanda, ubuninzi be-viscosity buyancipha. Nangona kunjalo, ubuninzi be-viscosity bunefuthe eliphantsi lobushushu kune-methyl cellulose. Isisombululo sayo sizinzile xa sigcinwe 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 yayo. I-Hydroxypropyl methylcellulose izinzile kwi-viscosity eqhelekileyo, kodwa xa uxinzelelo lwe-viscosity ye-hydroxypropyl methylcellulose ludla ngokwanda.
(4) Ukugcinwa kwamanzi kwe-hydroxypropyl methylcellulose kuxhomekeke kubungakanani bayo bokongeza, i-viscosity, njl.njl., kwaye izinga layo lokugcina amanzi phantsi kobungakanani obufanayo bokongeza liphezulu kunele-methyl cellulose.
(5) I-hydroxypropyl methylcellulose ingaxutywa nee-polymer compounds ezinyibilikayo emanzini ukuze zenze isisombululo esifanayo nesinoburhabaxa obuphezulu. Ezifana ne-polyvinyl alcohol, i-starch ether, i-vegetable gum, njl.njl.
(6) Ukunamathela kwe-hydroxypropyl methylcellulose kulwakhiwo lwe-mortar kuphezulu kunoko kwe-methylcellulose.
(7) I-hydroxypropyl methylcellulose inokumelana ngcono kwee-enzyme kune-methylcellulose, kwaye isisombululo sayo asinakwenzeka ukuba sonakaliswe zii-enzyme kune-methylcellulose.
Ixesha leposi: Epreli-17-2023