1. I-Hydroxypropyl methyl cellulose
I-hydroxypropyl methylcelluloseluhlobo lwe-cellulose oluphumayo kwaye lusetyenziswa ngokukhawuleza. Luhlobo lwe-non-ionic cellulose mixed ether olwenziwe ngekotoni ecociweyo emva kwe-alkalization, kusetyenziswa i-propylene oxide kunye ne-methyl chloride njenge-etherification agent, ngokusebenzisa uthotho lweempendulo. Iqondo lokutshintshwa ngokubanzi yi-1.2 ~ 2.0. Iimpawu zalo ziyahluka ngokuxhomekeke kumlinganiselo womxholo we-methoxyl kumxholo 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) (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 buyehla. Nangona kunjalo, impembelelo yobunzima bayo obuphezulu kunye nobushushu iphantsi kuneye-methyl cellulose. Isisombululo sayo sizinzile xa sigcinwe kubushushu begumbi.
(3) 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.
(4) 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 izinga layo lokunyibilika kwaye yonyuse kancinci i-viscosity yayo. I-Hydroxypropyl methylcellulose izinzile kwi-viscosity eqhelekileyo, kodwa xa uxinzelelo lwe-viscosity ye-hydroxypropyl methylcellulose ludla ngokwanda.
(5) I-hydroxypropyl methylcellulose ingaxutywa nee-polymers ezinyibilikayo emanzini ukuze zenze isisombululo esifana neso sinamandla aphezulu. Ezifana ne-polyvinyl alcohol, i-starch ether, i-vegetable gum, njl.
(6) I-hydroxypropyl methylcellulose inokumelana ngcono kwee-enzyme kune-methylcellulose, kwaye isisombululo sayo asinakwenzeka ukuba sonakaliswe zii-enzyme kune-methylcellulose.
(7) Ukunamathela kwe-hydroxypropyl methylcellulose kulwakhiwo lwe-mortar kuphezulu kunoko kwe-methylcellulose.
2. I-Hydroxyethyl cellulose
Yenziwe ngekotoni ecociweyo exutywe ne-alkali, kwaye ixutywe ne-ethylene oxide njenge-etherification agent xa kukho i-isopropanol. Ubungakanani bayo bokutshintshwa ngokubanzi yi-1.5 ~ 2.0. Inamandla okuthanda ukufuma kwaye kulula ukufunxa umswakama.
(1) I-Hydroxyethyl cellulose iyanyibilika emanzini abandayo, kodwa kunzima ukuyinyibilikisa emanzini ashushu. Isisombululo sayo sizinzile kubushushu obuphezulu ngaphandle kokufaka ijeli. Ingasetyenziswa ixesha elide kubushushu obuphezulu kwi-mortar, kodwa ukugcinwa kwamanzi kwayo kuphantsi kune-methyl cellulose.
(2)I-Hydroxyethyl celluloseizinzile kwi-asidi eqhelekileyo kunye ne-alkali, kwaye i-alkali inokukhawulezisa ukunyibilika kwayo kwaye inyuse kancinci i-viscosity yayo. Ukusasazeka kwayo emanzini kubi kancinci kunokwe-methyl cellulose kunye ne-hydroxypropyl methyl cellulose.
(3) I-Hydroxyethyl cellulose inamandla amahle okulwa nokuwa kwesamente, kodwa inexesha elide lokulibazisa isamente.
(4) Ukusebenza kwe-hydroxyethyl cellulose eveliswa ngamanye amashishini asekhaya ngokucacileyo kuphantsi kunokwe-methyl cellulose ngenxa yomthamo wayo wamanzi aphezulu kunye nomxholo womlotha ophezulu.
(5) Ukubola kwesisombululo samanzi se-hydroxyethyl cellulose kuyingozi kakhulu. Kubushushu obumalunga nama-40°C, ukubola kunokuvela kwiintsuku ezi-3 ukuya kwezi-5, nto leyo eya kuchaphazela ukusebenza kwayo.
Ixesha leposi: Epreli-28-2024