Hydroxypropylmethylcellulose (HPMC) o se polymer multifunctional e maua mai cellulose masani. E masani ona faʻaaogaina i le tele o alamanuia, e aofia ai vailaʻau, meaʻai, fausiaina ma mea teuteu. O le gaosiga o le HPMC e aofia ai le tele o mea mataʻutia ma le tele o laasaga.
Selulosa:
Punavai: Ole mea mata'utia ole HPMC ole cellulose, ole ga'o ga'o lavelave o lo'o maua ile puipui sela o la'au. O le puna masani o le cellulose mo le gaosiga o le HPMC o le pulupulu laupapa, ae o isi punaoa e pei o le cotton liters e mafai foi ona faʻaaogaina.
Sauniuniga: O le cellulose e masani lava ona togafitia e aveese ai mea leaga ona faʻaogaina lea i se tulaga talafeagai mo le faʻaleleia atili.
Faavae:
Ituaiga: Sodium hydroxide (NaOH) poʻo le potassium hydroxide (KOH) e masani ona faʻaaogaina e fai ma faʻavae i le taimi muamua o le gaosiga o le HPMC.
Galuega: Alkali e faʻaaogaina e togafitia ai le cellulose, mafua ai ona fula ma faʻaumatia lona fausaga. O lenei faiga, e ta'ua o le alkalization, e saunia ai le cellulose mo nisi gaioiga.
Alkali etherifying agent:
Hydroxypropylating agent: O le propylene oxide e masani ona faʻaaogaina e faʻafeiloaʻi ai vaega hydroxypropyl i totonu o le cellulose backbone. O lenei laasaga e tuʻuina atu ai le solubility ma isi mea manaʻomia ile cellulose.
Methylating agents: Methyl chloride poʻo le dimethyl sulfate e masani ona faʻaaogaina e faʻafeiloaʻi ai vaega methyl i luga o le fausaga o le cellulose, ma faʻaleleia ai lona tulaga atoa.
Methylating agent:
Methanol: Methanol e masani ona faʻaaogaina e avea o se solvent ma reactant i faiga methylation. E fesoasoani e faʻafeiloaʻi vaega methyl i filifili cellulose.
Hydroxypropylating sooupu:
Propylene oxide: O le mea autu autu mo le faʻaofiina o vaega hydroxypropyl i le cellulose. Ole tali ile va ole propylene oxide ma le cellulose e tupu i lalo ole tulaga pulea.
fa'atosina:
Acid Catalyst: O se vailaʻau faʻamaʻi, e pei o le sulfuric acid, e faʻaaogaina e faʻaleleia ai le faʻaogaina o le etherification. Latou te fesoasoani e pulea le fua faatatau o tali ma meatotino o oloa.
Solvent:
Suavai: E masani ona faʻaaogaina le vai e fai ma soʻo i laʻasaga eseese o le gaosiga. E taua mo le faʻamavaeina o mea faʻafefe ma faʻalauiloaina le tali i le va o le cellulose ma le etherifying agents.
Fa'agata:
Sodium hydroxide (NaOH) poʻo le potassium hydroxide (KOH): faʻaaogaina e faʻamalo ai faʻamaʻi gaʻo ma fetuutuunai le pH i le taimi o le faʻaogaina.
fa'amamāina:
Fesoasoani Fa'amama: E mafai ona fa'aogaina le tele o fesoasoani fa'amama e aveese ai mea leaga ma mea e le mana'omia mai le fa'afefiloi o tali.
Lafoa'i: O le fufuluina i le vai po'o isi vaifofo e fesoasoani e aveese ai vaila'au o totoe ma mea leaga mai le oloa mulimuli.
fa'amamago:
Ea po'o le ogaumu fa'agogo: A mae'a le fa'amamāina, e mafai ona fa'agogo le ea po'o le ogaumu e aveese ai le soli ma le susu.
Sui fa'atonuga lelei:
Su'esu'ega Su'esu'e: E fa'aogaina mea eseese mo fa'amoemoega lelei e fa'amautinoa ai o oloa a le HPMC e fetaui ma fa'atinoga mana'omia ma fa'amatalaga.
O le gaosiga o le hydroxypropyl methylcellulose e aofia ai le suia o le cellulose e ala i se faasologa o vailaʻau. O mea mata'utia e aofia ai le cellulose, alkali, etherifying agent, catalyst, solvent, neutralizing agent, purifying agent ma desiccant, lea e taua tele i le faagasologa o le synthesis. O tulaga ma'oti ma mea e fa'aaogaina e mafai ona fesuisuia'i e fa'atatau i mea e mana'omia ma le fa'aogaina o le oloa mulimuli o le hydroxypropyl methylcellulose.
Taimi meli: Tes-21-2023