Ukusetyenziswa kunye nokulungiswa kwe-hydroxyethyl methyl cellulose HEMC

I-Hydroxyethyl methyl cellulose HEMCinokusetyenziswa njenge-ejenti ekhuselayo ye-colloid, i-emulsifier kunye ne-dispersant ngenxa yomsebenzi wayo osebenzayo kwisisombululo esimanzi. 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 umqhaphu osulungekisiweyo njengento ekrwada kunye ne-ethylene oxide njenge-ejenti etherifying ukulungiselela.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. umqhaphu ocokisiweyo, iinxalenye ezingama-20-28 ze-oxyethane, iinxalenye ezingama-80-90 zemethyl chloride, kunye 16-19 iinxalenye ze-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 yokusa izaliswa ngamanzi etephu acocwe yi-osmosis ebuyela umva. isixhobo ku-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 nekhoyoi-cellulose etheriteknoloji yokuvelisa, ukuveliswa kwangoku kwamkela i-ethylene oxide njenge-etherifying agent yokulungisa i-hydroxyethyl methyl cellulose, kwaye inekhono elihle lokulwa ne-mildew ngenxa yokuba iqukethe iqela le-hydroxyethyl, Uzinzo oluhle lwe-viscosity kunye nokumelana nokubola ngexesha lokugcinwa kwexesha elide. Ingasetyenziswa endaweni yezinye ii-cellulose ethers.