HEMC hydroxyethyl methyl cellulose faiga gaosiga
Hydroxyethyl methyl cellulose HEMC e mafai ona faʻaaogaina e avea o se mea e puipuia ai colloidal, emulsifier ma dispersant ona o lona gaioiga i luga o le vai. Aafiaga ole hydroxyethyl methyl cellulose ile sima. O le Hydroxyethyl methyl cellulose ose pauta pa'epa'e e leai se manogi, e leai se tofo, e le o'ona e solo i le vai malulu e fai ai se vaifofo manino ma pipii. Faatasi ai ma le mafiafia, faʻapipiʻi, faʻasalalau, emulsification, faʻavae ata, faʻamalologa, adsorption, gelling, gaioiga i luga o le fogaeleele, taofi vai ma le puipuiga o le colloid, ma isi vai e mafai ona faʻaaogaina e pei o le colloid protectant, emulsifier ma dispersant ona o lona galue malosi i luga. Hydroxyethyl methyl cellulose vaifofo vai e lelei le hydrophilicity ma o se so'o lelei taofi vai.
HEMCfaiga gaosiga
Ua faailoa mai e le mea fou se auala sauniuni mo le hydroxyethyl methyl cellulose, lea e faʻaogaina ai le cotton faʻamamaina e fai ma mea mata ma le ethylene oxide e fai ma sui faʻamalama e saunia ai le hydroxyethyl methyl cellulose. O mea mataʻina mo le saunia o le hydroxyethyl methyl cellulose i le mamafa o: toluene ma le isopropanol faʻafefiloi 700 ~ 800 vaega e pei o le solvent, 30 ~ 40 vaega vai, sodium hydroxide 70 ~ 80 vaega, cotton faʻamamaina 80 ~ 85 vaega, ethylene oxide 20 ~ 28 vaega, methane chloride 80 ~ 90 vaega, glacial acetic acid 16 ~ 19 vaega; O laasaga fa'apitoa e fa'apea:
O le laasaga muamua o le faʻaopoopoina o toluene ma le isopropyl ava faʻafefiloi, vai, ma le sodium hydroxide i le ulo tali, vevela i le 60 ~ 80 ℃, taofi mo le 20 ~ 40 minute;
O le laasaga lona lua, alkalization: o le mea ua cooled i le 30 ~ 50 ℃, cotton faamamaina, toluene ma le isopropyl ava faafefiloi solvent spray, gaogao i - 0.006mpa, tumu i le nitrogen mo le 3 taimi sui, sui o alkalization, alkalization tulaga: taimi alkalization e 2 itula, alkaliization vevela o le 30 ℃-50 ℃;
O le laasaga lona tolu, etherification: ina ua uma le alkalization, o le reactor sa vacuumized i le 0.05-0.07mpa, ma ethylene oxide ma methane chloride sa faaopoopo mo 30-50 minute. Laasaga muamua o le etherification: 40 ~ 60 ℃, 1.0 ~ 2.0Hour, o loʻo pulea le mamafa i le va o le 0.15 0.3mpa; O le vaega lona lua o le etherification: 60 ~ 90 ℃, 2.0 ~ 2.5 itula, fa'atonuga mamafa i le va o le 0.4- 0.8mpa;
O le laasaga lona fa, neutralization: faʻaopopo fua fualaula acetic acid i le desolvation reactor muamua, lolomi i totonu o le etherized mea mo le neutralization, vevela maualuga i le 75 ~ 80 ℃ mo desolvation, vevela maualuga i le 102 ℃, PH iloa 6-8 O le maeʻa o le faataapeina; Faatumu le 90 ℃ ~ 100 ℃ reverse osmosis fa'apipi'i vai tap vai i totonu o le ulo fa'amama;
O le laasaga lona lima, fufulu centrifugal: o le laasaga lona fa o mea e ala i le faalava faataamilosaga centrifuge centrifugal separation, tuueseeseina o mea e siitia atu i le ulo vai vevela muai faatumuina, fufuluina mea;
O le laasaga lona ono, faʻamago centrifugal: o mea pe a uma ona fufulu e momoli atu i totonu o le mea faʻagogo e ala i le faʻataʻamilomilo centrifuge, ma faʻamago mea i le 150 ~ 170 ℃. O mea mamago e nutililii ma afifi.
Pe a faatusatusa i le tekinolosi gaosiga o loʻo i ai nei o le cellulose ether, o le mea fou e faʻaaogaina ai le ethylene oxide e fai ma sui o le etherification e saunia ai le hydroxyethyl methyl cellulose, lea e aofia ai le hydroxyethyl group, e iai le malosi o le mildew, lelei le mautu o le viscosity ma le mildew resistance pe a teuina mo se taimi umi. E mafai ona faʻaaogaina nai lo isi cellulose ether.
Taimi meli: Feb-12-2022