I-Hydroxyethyl methyl cellulose HEMCIngasetyenziswa njenge-arhente yokukhusela i-colloid, i-emulsifier kunye ne-dispersant ngenxa yomsebenzi wayo osebenzayo kumphezulu kwisisombululo samanzi. Umzekelo wokusetyenziswa kwayo ngolu hlobo lulandelayo: Isiphumo se-hydroxyethyl methyl cellulose kwiipropati zesamente. I-Hydroxyethyl methylcellulose yipowder emhlophe engenavumba, engenancasa, engenatyhefu enyibilika emanzini abandayo ukuze yenze isisombululo esicacileyo nesixineneyo. Ineempawu zokutyeba, ukubopha, ukusasaza, ukuhlanganisa, ukwenza ifilimu, ukumisa, ukufunxa, ukwenza i-gelling, ukusebenza kumphezulu, ukugcina umswakama kunye nokukhusela ii-colloids. Ngenxa yomsebenzi osebenzayo kumphezulu wesisombululo samanzi, ingasetyenziswa njenge-arhente yokukhusela i-colloid, i-emulsifier kunye ne-dispersant. Isisombululo samanzi se-Hydroxyethyl methyl cellulose sinobumanzi obuhle kwaye sisixhobo sokugcina amanzi esisebenza kakuhle.
lungiselela
Indlela yokulungiselela i-hydroxyethyl methyl cellulose, le ndlela ibandakanya ukusebenzisa umqhaphu ocoliweyo njengezinto eziluhlaza kunye ne-ethylene oxide njenge-etherifying agent ukulungiselela.i-hydroxyethyl methyl celluloseIzinto ezisetyenziswayo zokwenza i-hydroxyethyl methyl cellulose zilungiswa ngokwamacandelo ngobunzima: iinxalenye ezingama-700-800 zomxube we-toluene kunye ne-isopropanol njengesinyibilikisi, iinxalenye ezingama-30-40 zamanzi, iinxalenye ezingama-70-80 ze-sodium hydroxide, iinxalenye ezingama-80-85 zomqhaphu ocoliweyo, iinxalenye ezingama-20-28 ze-oxyethane, iinxalenye ezingama-80-90 ze-methyl chloride, kunye neenxalenye ezili-16-19 ze-glacial acetic acid; amanyathelo athile ngala:
Inyathelo lokuqala, kwi-reactor, yongeza umxube we-toluene kunye ne-isopropanol, amanzi, kunye ne-sodium hydroxide, ufudumale ukuya kuthi ga kwi-60 ~ 80 ℃, ufakwe kwi-incubation imizuzu engama-20 ~ 40;
Inyathelo lesibini, ukongeza i-alkalizing: pholisa izinto ezingentla ukuya kuma-30 ~ 50 ℃, yongeza umqhaphu ocoliweyo, fafaza umxube we-toluene kunye ne-isopropanol ngesinyibilikisi, khupha i-0.006Mpa, ugcwalise nge-nitrogen ukuze kutshintshwe izinto ezi-3, uze wenze i-alkali emva kokutshintsha. Iimeko zokufaka i-alkalizing zezi zilandelayo: ixesha lokufaka i-alkalizing ziiyure ezi-2, kwaye ubushushu bokufaka i-alkalizing buyi-30 °C ukuya kuma-50 °C;
Inyathelo lesithathu, i-etherification: i-alkaliization igqityiwe, i-reactor isuswa iye kwi-0.05 ~ 0.07MPa, kongezwa i-ethylene oxide kunye ne-methyl chloride, kwaye igcinwe imizuzu engama-30 ~ 50; inqanaba lokuqala le-etherification: 40 ~ 60℃, iyure eyi-1.0 ~ 2.0, uxinzelelo lulawulwa phakathi kwe-0.150.3Mpa; inqanaba lesibini le-etherification: 60 ~ 90℃, iiyure eziyi-2.0 ~ 2.5, uxinzelelo lulawulwa phakathi kwe-0.40.8Mpa;
Inyathelo lesi-4, ukuthomalalisa: yongeza i-acetic acid ye-glacial elinganisiweyo kwangaphambili kwiketile yokuthomalalisa, cinezela kwizinto ezifakwe i-ether ukuze zithomalalise, fudumeza i-75 ~ 80 ℃ ukuze kuphume imvula, ubushushu bunyuke bufikelele kwi-102 ℃, kwaye ixabiso le-pH lokufumanisa liyi-68 Xa imvula igqityiwe, itanki yokuthomalalisa izaliswa ngamanzi empompini anyangwa sisixhobo se-reverse osmosis kwi-90 ~ 100 ℃;
Inyathelo lesihlanu, ukuhlamba nge-centrifugal: izinto ezikwinqanaba lesine zixutywa nge-centrifuge ethe tye, kwaye izinto ezahlulweyo zidluliselwa kwiketile yokuhlamba egcwele amanzi ashushu kwangaphambili, kwaye izinto ziyahlanjwa;
Inyathelo lesithandathu, ukomisa nge-centrifugal: izinto ezihlanjiweyo zithuthwa zisiwe kwi-dryer nge-screw centrifuge ethe tye, izinto zomiswe kwi-150-170°C, kwaye izinto ezomileyo ziyacolwa kwaye zipakishwe.
Xa kuthelekiswa nezinto ezikhoyoi-cellulose etherNgenxa yeteknoloji yemveliso, olu vumbululo lusebenzisa i-ethylene oxide njenge-etherifying agent yokulungiselela i-hydroxyethyl methyl cellulose, kwaye inamandla amahle okulwa nokungunda kuba ineqela le-hydroxyethyl, Uzinzo oluhle lwe-viscosity kunye nokumelana nokungunda ngexesha lokugcina ixesha elide. Ingasetyenziswa endaweni yezinye ii-ether ze-cellulose.
Ixesha leposi: Epreli-25-2024