Hydroxyethyl methyl cellulose HEMC e mafai ona faʻaaogaina e avea ma sui puipui colloid, emulsifier ma dispersant ona o lona galue malosi i luga o le vai. O se faʻataʻitaʻiga o lona faʻaogaina e faʻapea: Le aʻafiaga o le hydroxyethyl methyl cellulose i luga o meatotino o le sima. O le Hydroxyethyl methylcellulose o se pauta pa'epa'e e leai se manogi, e leai se tofo, e fa'amavae i le vai malulu e fai ai se vaifofo manino ma le viscous. O loʻo i ai mea totino o le mafiafia, fusifusia, faʻasalalau, emulsifying, faʻapipiʻi ata, faʻagata, adsorbing, gelling, galue i luga, taofi le susu ma puipuia colloids. Ona o le galue malosi i luga o le vai, e mafai ona faʻaaogaina e avea o se mea e puipuia ai colloid, se emulsifier ma se faʻasalalau. Hydroxyethyl methyl cellulose vaifofo vai o lo'o i ai le hydrophilicity lelei ma o se vaila'au fa'atumauina vai maualuga.
saunia
O se metotia mo le saunia o le hydroxyethyl methyl cellulose, o le metotia e aofia ai le faʻaaogaina o le cotton faʻamamaina e fai ma mea mata ma le ethylene oxide e fai ma sui etherifying e saunia ai le hydroxyethyl methyl cellulose. O mea mataʻina mo le saunia o le hydroxyethyl methyl cellulose o loʻo saunia i vaega i le mamafa: 700-800 vaega o le faʻafefiloi o toluene ma le isopropanol o se solvent, 30-40 vaega o le vai, 70-80 vaega ole sodium hydroxide, 80-85 vaega ole cotton faʻamamaina, 20-28 vaega o le oxyethane, 80-90 vaega o le methyl chloride, ma le 16-19 vaega ole acetic acid glacial; o laasaga patino o:
O le laasaga muamua, i totonu o le reactor, faʻaopopo toluene ma le isopropanol paluga, vai, ma le sodium hydroxide, faʻamafanafana i le 60 ~ 80 ℃, faʻafefe mo le 20 ~ 40 minute;
O le laasaga lona lua, alkalization: faʻamafanafana mea o loʻo i luga i le 30 ~ 50 ℃, faʻaopopo le cotton faʻamamaina, faʻafefe le faʻafefiloi o toluene ma le isopropanol ma le solvent, faʻamalo i le 0.006Mpa, faʻatumu i le nitrogen mo le 3 sui, ma faʻatino alkali pe a uma ona sui. tulaga e faapea: o le alkalization taimi e 2 itula, ma le alkalization vevela o le 30°C i le 50°C;
O le laasaga lona tolu, etherification: ua maeʻa le alkalization, ua aveese le reactor i le 0.05 ~ 0.07MPa, faʻaopoopo le ethylene oxide ma le methyl chloride, ma teuina mo le 30 ~ 50 minute; le laasaga muamua o le etherification: 40 ~ 60 ℃, 1.0 ~ 2.0 itula, o le mamafa e pulea i le va o le 0.150.3Mpa; le vaega lona lua o le etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 itula, o le mamafa e pulea i le va o le 0.40.8Mpa;
O le laasaga lona 4, faʻafefeteina: faʻapipiʻi muamua le suka acetic acid mita i le ulo timuga, lolomi i totonu o le mea faʻapipiʻi mo le faʻaleagaina, vevela 75 ~ 80 ℃ e faʻataunuʻu ai le timuga, o le vevela e oʻo i le 102 ℃, ma o le tau o le pH 68 A mae'a le timu, e fa'atumu le tane vai i vai paipa e fa'aogaina e le masini fa'asolo i le 90℃～100℃;
O le laasaga lona lima, fufuluina centrifugal: o mea i le laasaga lona fa e centrifuged e se centrifuge sikulima faalava, ma o le mea tuueseeseina ua siitia atu i se ulo fufulu tumu i le vai vevela muamua, ma le mea e fufulu;
O le laasaga lona ono, faʻamago centrifugal: o mea fufulu e ave i totonu o le mea faʻagogo e ala i se faʻamalo faʻalava, faʻamago mea i le 150-170 ° C, ma faʻamago mea faʻamago e faʻapalapala ma afifi.
Pe a faatusatusa i le cellulose ether gaosiga tekinolosi o loo i ai nei, o le mea fou fou ua faaaogaina ethylene oxide e avea ma sui etherifying e saunia hydroxyethyl methyl cellulose, ma e lelei le mafai anti-mildew ona o loo i ai hydroxyethyl vaega, lelei viscosity mautu ma mildew tetee i taimi umi teuina. E mafai ona faʻaaogaina nai lo isi cellulose ethers.
Taimi meli: Sep-26-2022