Igoa mama—tatala—alkalization—etherification—neutralization—separation—fufulness—separation—faamago—tuʻimomomo—faʻapipiʻiina—maʻea le tatalaina o oloa HPMC: O le cotton ua faʻamamaina e tatala e aveese ai le uʻamea ona nutimomoia ai lea.O le cotton faʻamamaina faʻafefeteina o loʻo i ai i foliga o le paʻu, faʻatasi ai ma le lapopoa o le 80 mesh ma le transmittance o le 100%.A leai, e faigofie ona faʻatasi faʻatasi i le faagasologa o le tali ma faʻaitiitia le lelei o le etherification.
Alkalization: Faʻaopopo le paʻu faʻameamea faʻamamaina pe a uma ona tatala le cotton i se solvent inert, ma faʻagaoioia i le alkali ma vai vaivai e faʻafefe ai le lattice o le cotton faʻamamaina e faʻafaigofie ai le faʻaogaina o mole faʻamaʻi etherification ma faʻaleleia le tutusa o le tali etherification.O le alkali fa'aaogaina mo le fa'alalization o se u'amea hydroxide po'o se alkali fa'aola.O le aofaʻi o le alkali faʻaopoopo (e ala i le tele, tutusa i lalo) e 0.1-0.6 taimi o le cotton faʻamamaina, o le aofaʻi o le vai vaivai e faʻaopoopoina e 0.3-1.0 taimi o le cotton faʻamamaina;o le solvent inert o se faʻafefiloi o le ava malosi ma le hydrocarbon, ma o le aofaʻi o le solvent inert faʻaopoopo e 0.3-1.0 taimi o le cotton faʻamamaina.7 -15 taimi o lena: O le solvent inert e mafai foi ona avea ma ava malosi ma 3-5 carbon atoms (pei o le ava malosi, propanol), acetone.E mafai foi ona avea ma aliphatic hydrocarbons ma aromatic hydrocarbons;e tatau ona pulea le vevela i totonu ole 0-35 ° C i le taimi ole alkalization;ole taimi ole alalization e tusa ole 1hr.O le fetuunaiga o le vevela ma le taimi e mafai ona fuafuaina e tusa ai ma mea e manaʻomia ma oloa.
Etherification: A maeʻa togafitiga alkalization, i lalo o tulaga gaogao, eterification sui sooupu e faaopoopo mo etherification, ma o le etherification sui o propylene oxide.Ina ia faʻaitiitia le faʻaaogaina o le etherification agent, i le taimi o le etherification process, o le etherification agent e faʻaopoopoina i le lua taimi, o le aofaʻi o le faʻaopoopoga muamua e 1-3.5 taimi o le cotton faʻamamaina, ma le aofaʻi o faʻaopoopoga e lua e 1.5. -4 taimi nai lo le itoni ua fa'amamaina.taimi.A maeʻa ona faʻapipiʻi le sui etherifying mo le taimi muamua, faʻafefe i le ≤30 ° C mo le 45min-90min, ona siitia lea o le vevela i le 50-100 ° C mo le etherification mo le 1-5h, ona faʻamafanafana lea i le ≤30 ° C, o le taimi lona lua e faʻaopoopo etherification faʻavevesi, faʻavevesi taimi e 30-120min, ona faʻamafanafanaina lea i???Faia le etherification, o le taimi o le 1-4h, i le taimi nei, o le cotton faʻamamaina atoatoa e tali atu ma le etherification agent e gaosia ai le hYDROXYPROPYL METHYLCELLULOSE HPMC.
Tuʻimomomo ma afifiina: tuʻimomomoina ma sieving oloa mago o le mea fou fou, o le vaega itiiti o le oloa HPMC o le mea fou fou pe a uma ona tuʻimomomo ma sieving o le 40 mata ma le transmittance o le 10096, pe tusa ai ma manaoga o tagata e faaaogāina.Ona teu lea o le HPMC.
Taimi meli: Nov-24-2022