I-Hydroxyethyl methyl cellulose I-HEMC ingasetyenziselwa njenge-agent ekhuselayo ye-colloid, i-emulsifier kunye ne-dispersant ngenxa yomsebenzi wayo osebenzayo osebenzayo kwisisombululo samanzi. Umzekelo wokusetyenziswa kwawo ngolu hlobo lulandelayo: Umphumo we-hydroxyethyl methyl cellulose kwiipropati zesamente. IHydroxyethyl methylcellulose ngumgubo omhlophe ongenavumba, ongenancasa, ongenatyhefu onyibilika emanzini abandayo ukwenza isisombululo esicacileyo, esibonakalayo. Ineempawu zokuqina, ukubopha, ukusabalalisa, i-emulsifying, ifilimu-ifom, ukumisa, i-adsorbing, i-gelling, i-surface-active, igcina umswakama kunye nokukhusela i-colloids. Ngenxa yomsebenzi osebenzayo wesisombululo se-aqueous, sinokusetyenziswa njenge-colloid ekhuselayo, i-emulsifier kunye ne-dispersant. I-Hydroxyethyl methyl cellulose isisombululo samanzi sine-hydrophilicity elungileyo kwaye sisixhobo sokugcina amanzi ngokufanelekileyo.
lungiselela
Indlela yokulungiselela i-hydroxyethyl methyl cellulose, indlela iquka ukusebenzisa ikotoni ecocekileyo njengento eluhlaza kunye ne-ethylene oxide njenge-etherifying agent yokulungisa i-hydroxyethyl methyl cellulose. Izinto ezisetyenziswayo zokulungiselela i-hydroxyethyl methyl cellulose zilungiswa kumacandelo ngobunzima: iinxalenye ezingama-700-800 zomxube we-toluene kunye ne-isopropanol njengesinyibilikisi, iinxalenye ezingama-30-40 zamanzi, iinxalenye ezingama-70-80 zesodium hydroxide, iinxalenye ezingama-80-85 ze-sodium hydroxide. i-cotton ecocekileyo, i-20-28 iingxenye ze-oxyethane, i-80-90 iingxenye ze-methyl chloride, kunye ne-16-19 ye-glacial acetic acid; Amanyathelo athile ngala:
Isinyathelo sokuqala, kwi-reactor, yongeza i-toluene kunye nomxube we-isopropanol, amanzi, kunye ne-sodium hydroxide, ukufudumala ukuya kwi-60～80 ℃, ifakwe kwi-20～40 imizuzu;
Inyathelo lesibini, i-alkalization: zipholisa ezi zinto zingasentla kwi-30～50℃, yongeza umqhaphu osulungekisiweyo, utshize umxube we-toluene kunye ne-isopropanol nge-solvent, ukhuphele kwi-0.006Mpa, ugcwalise nge-nitrogen endaweni ye-3, kwaye wenze ialkali emva kokutshintshwa kwe-alkalization. iimeko zimi ngolu hlobo lulandelayo: ixesha le-alkalization liyi-2 iiyure, kwaye ukushisa kwe-alkalization yi-30 ° C ukuya ku-50 ° C;
Isinyathelo sesithathu, i-etherification: i-alkalization igqityiwe, i-reactor ikhutshwe kwi-0.05～0.07MPa, i-ethylene oxide kunye ne-methyl chloride yongezwa, kwaye igcinwe imizuzu engama-30～50; isigaba sokuqala se-etherification: 40～60℃, 1.0～2.0 iyure, uxinzelelo lulawulwa phakathi kwe-0.150.3Mpa; isigaba sesibini se-etherification: 60～90℃, 2.0～2.5 iiyure, uxinzelelo lulawulwa phakathi kwe-0.40.8Mpa;
Inyathelo lesi-4, ukungathathi hlangothi: yongeza i-acetic acid enemitha ye-acetic kwangethuba kwiketile yemvula, cinezela kwi-etherified material ukuze ungathathi hlangothi, fudumeza i-75℃ 75℃ ukwenza imvula, iqondo lobushushu liyenyuka liye kwi-102 ℃, kunye nexabiso le-pH lokufunyaniswa. 68 Xa imvula igqityiwe, itanki yokuzalisa izaliswa ngamanzi etephu acocwe sisixhobo se-osmosis esingasemva kwi-90℃～100℃;
Isinyathelo sesihlanu, ukuhlamba i-centrifugal: izinto ezikwinqanaba lesine zifakwe kwi-centrifuge ye-screw centrifuge, kwaye izinto ezihlukeneyo zidluliselwa kwi-kettle yokuhlamba ezaliswe ngamanzi ashushu kwangaphambili, kwaye izinto ziyahlanjwa;
Isinyathelo sesithandathu, ukomisa i-centrifugal: izinto ezihlanjiweyo zihanjiswa kwi-dryer nge-screw centrifuge e-horizontal, izinto zomisiwe kwi-150-170 ° C, kwaye izinto ezomileyo zixutywe kwaye zipakishwe.
Xa kuthelekiswa neteknoloji yokuvelisa i-cellulose ether ekhoyo, ukuveliswa kwangoku kwamkela i-ethylene oxide njenge-etherifying agent yokulungisa i-hydroxyethyl methyl cellulose, kwaye inekhono elihle lokulwa ne-mildew kuba iqulethe iqela le-hydroxyethyl, Uzinzo oluhle lwe-viscosity kunye nokumelana nokubola ngexesha elide lokugcinwa. Ingasetyenziswa endaweni yezinye ii-cellulose ethers.
Ixesha lokuposa: Sep-26-2022