O le hydroxypropyl methylcellulose ma le hydroxyethyl cellulose o cellulose, o le a le eseesega i le va o le lua?
“O le Eseesega i le va o le HPMC ma le HEC”
01 HPMC ma HEC
Hydroxypropyl methylcellulose (Hypromellose), e taʻua foi o le hypromellose, o se ituaiga e le o le ionic cellulose fefiloi eter.Ose polymer semisynthetic, inactive, viscoelastic e masani ona fa'aogaina e fai ma lubricant ile ophthalmology, po'o se mea e fa'aoga ai po'o se ta'avale i vaila'au tu'u gutu.
Hydroxyethyl cellulose (HEC), fua fa'ama'i (C2H6O2)n, ose pa'epa'e po'o moli samasama, leai se manogi, e le o'ona fibrous po'o pa'u pa'u malo e aofia ai le alkaline cellulose ma le ethylene oxide (po'o le chloroethanol) E saunia e le etherification ma e patino i le non- ionic soluble cellulose ethers.Talu ai ona o le HEC o loʻo i ai meatotino lelei o le mafiafia, faʻamalolo, faʻasalalau, emulsifying, faʻapipiʻi, ata tifaga, puipuia le susu ma le tuʻuina atu o le colloid puipuia, ua faʻaaogaina lautele i suʻesuʻega suauʻu, faʻapipiʻi, fausiaina, vailaʻau ma meaʻai, textile, pepa ma polymer Polymerization ma isi fanua, 40 mata sieving fua faatatau ≥ 99%.
02 eseesega
E ui lava o mea uma e lua e cellulose, e tele eseesega i le va o le lua:
Hydroxypropyl methylcellulose ma le hydroxyethylcellulose eseese i meatotino, fa'aoga, ma solubility.
1. Vaega eseese
Hydroxypropyl methylcellulose: (HPMC) o le pa'epa'e po'o le tutusa alava pa'epa'e po'o le pa'u pa'epa'e, o lo'o a'afia i ethers fefiloi fa'afefiloi nonionic cellulose.Ose polymer viscoelastic semi-synthetic e le ola.
Hydroxyethylcellulose: (HEC) ose pa'epa'e po'o samasama, e leai se manogi ma e leai se o'ona po'o le pauta malo.E faʻamalosia e le alkaline cellulose ma le ethylene oxide (poʻo le chlorohydrin).E a'afia i le ether cellulose e le ionic soluble.
2. Solubility eseese
Hydroxypropyl methylcellulose: toetoe a le mafai ona solu i le ethanol atoatoa, eter ma acetone.E manino pe fai sina puaoa vaifofo colloidal fa'amavae ile vai malulu.
Hydroxyethyl cellulose: O loʻo i ai mea totino o le mafiafia, faʻamalolo, fusifusia, emulsifying, faʻasalalau ma susu.E mafai ona saunia fofo i tulaga viscosity eseese ma e sili ona lelei solubility masima mo electrolytes.
O le Hydroxypropyl methylcellulose o loʻo i ai uiga o le mafiafia o le malosi, le maualalo o le masima, faʻamautu o le pH, faʻamauina o le vai, faʻamautu tulaga, mea sili ona lelei e fai ata tifaga, faʻalauteleina o le enzyme resistance, dispersibility ma le faʻatasi.
E tele eseesega i le va o ia mea e lua, ma o latou aoga i totonu o pisinisi e matua ese foi.
O le Hydroxypropyl methylcellulose e masani ona faʻaaogaina e pei o le mafiafia, faʻasalalau ma faʻamautu i le alamanuia faʻapipiʻi, ma e lelei le solubility i le vai poʻo le solvents organic.I totonu o le fale gaosi oloa, e mafai ona faʻaaogaina i le sima, gypsum, latex putty, plaster, ma isi, e faʻaleleia ai le faʻasalalauina o le oneone sima ma faʻaleleia atili ai le palasitika ma le taofiofia o vai o le sima.
O le hydroxyethyl cellulose o loʻo i ai meatotino o le mafiafia, faʻamalolo, fusifusia, emulsifying, faʻasalalau ma susu.E mafai ona saunia fofo i laina viscosity eseese ma e sili ona lelei le solubility masima mo electrolytes.Hydroxyethyl cellulose o se ata tifaga lelei muamua, tackifier, mafiafia, stabilizer ma dispersant i shampoos, pulumu lauulu, neutralizers, conditioners ma cosmetics;i le fufuluina o pauta I le ogatotonu o loʻo i ai se ituaiga o mea e toe faʻaleleia ai le palapala.O le hydroxyethyl cellulose e faʻamavae vave i le maualuga o le vevela, lea e mafai ona faʻavaveina ai le gaosiga o gaosiga ma faʻaleleia atili le gaosiga.O le fa'aaliga manino o vaila'au o lo'o i ai le hydroxyethyl cellulose e mafai ona fa'aleleia atili le lamolemole ma le mercerization o ie.
Taimi meli: Sep-26-2022