Fa'amamaina ole Hydroxyethyl cellulose

Hydroxyethyl cellulose(HEC) o se polymer solu vai lea e masani ona faʻaaogaina i pisinisi eseese e pei o vailaʻau, mea teuteu, ma meaʻai. O le HEC e maua mai i le cellulose, o se polymer faanatura o loʻo maua i laʻau, ma ua suia i vaega hydroxyethyl e faʻaleleia ai lona soluble vai ma isi mea totino.

O le faʻamamaina o le HEC e aofia ai le tele o laasaga e faʻamama ma faʻaleleia le polymer e faʻamalieina manaʻoga faʻapitoa mo lona faʻaogaina. O nisi nei o laasaga masani e aofia i le faʻaleleia o le HEC:

1. Faʻamamāina: O le laasaga muamua i le faʻamamaina o le HEC o le faʻamamaina o le cellulose raw material. E aofia ai le aveeseina o mea leaga e pei o le lignin, hemicellulose, ma isi mea leaga e mafai ona afaina ai le lelei ma meatotino o le oloa mulimuli. E mafai ona ausia le faʻamamaina e ala i auala eseese e pei o le fufuluina, faʻamalama, ma togafitiga enzymatic.

2. Alkalization: A maeʻa le faʻamamaina, e togafitia le cellulose i se vaifofo alkaline e faʻateleina ai lona gaioiga ma faʻafaigofie le faʻaofiina o vaega hydroxyethyl. E masani ona faia le fa'alalalization i le sodium hydroxide po'o le potassium hydroxide i le maualuga o le vevela ma le mamafa.

3. Etherification: O le isi laasaga o le faʻaofiina o vaega hydroxyethyl i luga o le cellulose backbone. E faia lea e ala i le etherification, lea e aofia ai le taliina o le cellulose ma le ethylene oxide i le i ai o se alkaline catalyst. O le tikeri o le etherification e mafai ona pulea e ausia ai mea e manaʻomia e pei o le viscosity, solubility, ma le faʻamautuina o le vevela.

4. Neutralization: A maeʻa le etherification, o le oloa e faʻaleagaina e aveese soʻo se alkali totoe ma fetuunai le pH i se tulaga talafeagai mo lona faʻaaogaina. E mafai ona faia le fa'a'ese'esega i se vaila'au pei ole acetic acid po'o le citric acid.

5. Filtration ma faʻamago: O le laasaga mulimuli o le faʻamama ma faʻamago o le oloa faʻamamaina HEC. O le oloa e masani ona faʻamama e aveese soʻo se mea leaga o loʻo totoe ona faʻamago lea i se mea susu talafeagai mo le teuina ma le felauaiga.

I le aotelega, o le faʻaleleia o le HEC e aofia ai se faʻasologa o laasaga e faʻamama ma faʻaleleia ai le cellulose mea mata e maua ai se polymer maualuga, vai-soluble ma mea faʻapitoa mo lona faʻaogaina.