Hydroxyethyl Cellulose (HEC) ma le hydroxypropyl cellulose (HPC) e lua e masani ona faʻaaogaina cellulose derivatives. E iai a latou eseesega taua i le fausaga, faʻatinoga ma le faʻaogaina.
1. Fa'asologa o vaila'au
Hydroxyethyl cellulose (HEC): Hydroxyethyl cellulose e fausia e ala i le tuʻuina atu o se vaega hydroxyethyl (-CH₂CH₂OH) i luga o le mole mole. Ole vaega ole hydroxyethyl e maua ai le HEC lelei ole solubility ma le mautu.
Hydroxypropyl Cellulose (HPC): O le hydroxypropyl cellulose e fausia e ala i le tuʻuina atu o se vaega hydroxypropyl (-CH₂CHOHCH₃) i luga o le mole mole. O le fa'aofiina o vaega hydroxypropyl e maua ai le HPC solubility eseese ma uiga viscosity.
2. Solubility
HEC: Hydroxyethylcellulose e lelei le soluble i le vai ma e mafai ona fausia se vaifofo manino colloidal. O lona solubility e fa'alagolago i le maualuga o le suia o vaega hydroxyethyl (fa'atusa o le numera o vaega hydroxyethyl i le kulukose).
HPC: Hydroxypropyl cellulose o lo'o i ai se solubility fa'apitoa i vai ma solu fa'aletino, aemaise lava i solu fa'aola pei ole ethanol. Ole solubility ole HPC e matua a'afia ile vevela. A oʻo ina faʻatuputeleina le vevela, o lona soluble i le vai o le a faʻaitiitia.
3. Viscosity ma rheology
HEC: O le hydroxyethyl cellulose e maualuga lona viscosity i le vai ma e fa'aalia ai uiga o se vai pseudoplastic, e pei o le manifinifi sele. A fa'aoga sele, e fa'aitiitia lona viscosity, fa'afaigofie ona fa'aoga ma fa'aoga.
HPC: Hydroxypropyl cellulose e la'ititi la'ititi le viscosity ma fa'aalia le pseudoplasticity tutusa ile fofo. E mafai fo'i e vaifofo a le HPC ona fausia ni colloid manino, ae o lo latou viscosity e masani lava ona maualalo nai lo HEC.
4. Fa'aoga vaega
HEC: Hydroxyethyl cellulose o loʻo faʻaaogaina lautele i mea faʻapipiʻi, mea fau fale, mea teuteu, vailaʻau ma isi fanua. I le avea ai o se mafiafia, faʻamautu ma le faʻamalolo le tumau, e mafai ona pulea lelei le viscosity ma le rheology o le faiga. I vali ma faʻapipiʻi, HEC e taofia le faʻanofoina o le pigmenti ma faʻaleleia le faʻavasegaina o le ufiufi.
HPC: Hydroxypropyl cellulose e masani ona faʻaaogaina i vailaʻau, meaʻai, mea teuteu ma isi fanua. I le falema'i vaila'au, e masani ona fa'aogaina le HPC e fai ma fa'amau ma fa'atonu le fa'asa'olotoga mo papa. I totonu o fale gaosi meaʻai, e mafai ona faʻaaogaina e avea o se mafiafia ma emulsifier. Ona o lona solubility i solvents organic, o loʻo faʻaaogaina foi le HPC i nisi mea faʻapipiʻi ma membrane.
5. Mausalī ma tumau
HEC: Hydroxyethyl cellulose e lelei le mautu ma le tumau, e le afaina i suiga o le pH, ma tumau pea i le taimi e teu ai. E tumau pea le HEC i lalo o tulaga maualuga ma maualalo pH.
HPC: Hydroxypropyl cellulose e maaleale i suiga o le vevela ma le pH, ma e faigofie ona faʻafefeteina aemaise lava ile vevela maualuga. E sili atu lona mautu i lalo o tulaga acidic, ae o lona mautu o le a faaitiitia i lalo o tulaga alkaline.
6. Siosiomaga ma biodegradability
HEC: Hydroxyethyl cellulose ose mea e maua mai le cellulose faanatura, e lelei le biodegradability ma e faauo i le siosiomaga.
HPC: O le hydroxypropyl cellulose ose mea e mafai ona fa'aleagaina, ae o ana amioga fa'aleagaina e ono eseese ona o lona soluble ma le eseese o fa'aoga.
Hydroxyethyl cellulose ma le hydroxypropyl cellulose o ni mea taua se lua e maua mai i le cellulose. E ui lava o loʻo i ai uma le malosi e faʻamalosi ai, faʻamautu ma fai colloids, ona o eseesega faʻavae, e iai a latou eseesega i le solubility, viscosity, ma le faʻaogaina o fanua. E iai se eseesega tele i le mautu. Ole filifiliga ole mea ole cellulose e fa'aoga e fa'atatau ile mana'oga fa'apitoa ole fa'aoga ma mana'oga fa'atinoga.
Taimi meli: Aukuso-08-2024