Hydroxyethyl methyl cellulose HEMC inogona kushandiswa se colloid inodzivirira mumiririri, emulsifier uye inoparadzira nekuda kweiyo yepamusoro inoshanda basa mune aqueous mhinduro. Muenzaniso wekushandiswa kwayo ndeuyu: Mhedzisiro yehydroxyethyl methyl cellulose pane zvinhu zvesimende. Hydroxyethyl methylcellulose inonhuhwirira, isinganakidze, isina chepfu chena poda inonyungudika mumvura inotonhora kuti igadzire mhinduro yakajeka, ine viscous. Iyo ine zvimiro zvekukora, kusunga, kuparadzira, emulsifying, firimu-kuumba, kumisa, adsorbing, gelling, pamusoro-inoshanda, kuchengetedza unyoro uye kudzivirira colloids. Nekuda kweiyo yepamusoro inoshanda basa reiyo aqueous solution, inogona kushandiswa se colloid inodzivirira agent, emulsifier uye dispersant. Hydroxyethyl methyl cellulose aqueous solution ine yakanaka hydrophilicity uye inonyatso shandiswa kuchengetedza mvura.
gadzirira
Iyo nzira yekugadzira hydroxyethyl methyl cellulose, iyo nzira inosanganisira kushandisa donje rakanatswa seyakagadzirwa uye ethylene oxide senge etherifying agent kugadzirira hydroxyethyl methyl cellulose. Zvigadzirwa zvekugadzira hydroxyethyl methyl cellulose zvakagadzirirwa muzvikamu nehuremu: 700-800 zvikamu zvemusanganiswa we toluene uye isopropanol se solvent, 30-40 zvikamu zvemvura, 70-80 zvikamu zve sodium hydroxide, 80-85 zvikamu zve. donje rakanatswa, 20-28 zvikamu zve oxyethane, 80-90 zvikamu zvemethyl chloride, uye 16-19 zvikamu zveglacial acetic acid; matanho chaiwo ndeaya:
Nhanho yekutanga, mu reactor, wedzera toluene uye isopropanol musanganiswa, mvura, uye sodium hydroxide, ichidziya kusvika 60～80 ℃, incubated 20～40 maminetsi;
Danho rechipiri, alkalization: tonhoresa zvinhu zviri pamusoro kusvika 30～50℃, wedzera donje rakanatswa, pfapfaidza musanganiswa we toluene ne isopropanol ne solvent, buda kuenda ku 0.006Mpa, zadza ne nitrogen kune matatu anotsiva, uye ita alkali mushure mekutsiva Iyo alkalization. mamiriro ezvinhu ndeaya anotevera: nguva ye alkalization imaawa maviri, uye tembiricha ye alkalization ndeye 30 ° C kusvika 50 ° C;
Nhanho yechitatu, etherification: iyo alkalization inopedzwa, reactor inoendeswa kune 0.05～0.07MPa, ethylene oxide uye methyl chloride inowedzerwa, uye inochengeterwa 30～50 maminetsi; nhanho yekutanga ye etherification: 40～60℃, 1.0～2.0 awa, kudzvanywa kunodzorwa pakati pe0.150.3Mpa; chikamu chechipiri che etherification: 60～90℃, 2.0～2.5 maawa, kumanikidzwa kunodzorwa pakati pe0.40.8Mpa;
Nhanho yechina, neutralization: wedzera metered glacial acetic acid kumberi kune kettle yekunaya, dzvanya mune etherified material yekusagadzikana, kupisa 75℃ 80 ℃ kuita kunaya, tembiricha inokwira kusvika 102 ℃, uye yekuona pH kukosha ndeye. 68 Kana kunaya kwapera, tangi yekunaya inozadzwa nemvura yemupombi inobatwa nereverse osmosis mudziyo pa90℃～100℃;
Nhanho yechishanu, centrifugal washing: zvinhu muchikamu chechina centrifuged nehorizontal screw centrifuge, uye iyo yakaparadzaniswa inotamirwa kune kettle yekugeza izere nemvura inopisa mberi, uye zvinhu zvinoshambidzwa;
Nhanho yechitanhatu, kuomeswa kwecentrifugal: iyo yakashambidzwa inotakurwa muomesi kuburikidza nehorizontal screw centrifuge, iyo yakaomeswa pa 150-170 ° C, uye iyo yakaomeswa inoputirwa uye yakaputirwa.
Kana ichienzaniswa neiyo iripo cellulose ether yekugadzira tekinoroji, kugadzirwa kwazvino kunotora ethylene oxide seyo etherifying agent kugadzirira hydroxyethyl methyl cellulose, uye ine yakanaka anti-mildew kugona nekuti ine hydroxyethyl boka, Yakanaka viscosity kugadzikana uye mildew kuramba panguva yekuchengetedza kwenguva refu. Inogona kushandiswa pachinzvimbo chemamwe cellulose ether.
Nguva yekutumira: Sep-26-2022