ʻO Hydroxyethyl Cellulose (HEC) a me ka hydroxypropyl cellulose (HPC) ʻelua mau mea hoʻohana maʻamau cellulose. Loaʻa iā lākou kekahi mau ʻokoʻa koʻikoʻi ma ke ʻano, ka hana a me ka hoʻohana ʻana.
1. ʻO ke kinona
Hydroxyethyl cellulose (HEC): Hoʻokumu ʻia ka Hydroxyethyl cellulose ma ka hoʻokomo ʻana i kahi pūʻulu hydroxyethyl (-CH₂CH₂OH) ma luna o ka mole cellulose. Hāʻawi ka hui hydroxyethyl iā HEC i ka solubility maikaʻi a me ka paʻa.
Hydroxypropyl Cellulose (HPC): Hoʻokumu ʻia ka Hydroxypropyl cellulose ma ka hoʻokomo ʻana i kahi hui hydroxypropyl (-CH₂CHOHCH₃) ma luna o ka mole mole. ʻO ka hoʻokomo ʻana o nā pūʻulu hydroxypropyl hāʻawi iā HPC i nā ʻano solubility a me nā ʻano viscosity.
2. Hoʻoheheʻe
HEC: Hiki ke hoʻoheheʻe maikaʻi ʻia ka Hydroxyethylcellulose i ka wai a hiki ke hana i kahi hoʻonā colloidal akaka. Aia kona hoʻoheheʻe ʻia ma ke ʻano o ka hoʻololi ʻana i nā pūʻulu hydroxyethyl (ʻo ia ka helu o nā pūʻulu hydroxyethyl no ka ʻāpana glucose).
HPC: ʻO ka hydroxypropyl cellulose kekahi mea hiki ke hoʻoheheʻe ʻia i loko o ka wai a me nā mea hoʻoheheʻe kūlohelohe, ʻoi aku hoʻi i nā mea hoʻoheheʻe kūlohelohe e like me ka ethanol. Hoʻopilikia nui ʻia ka solubility o ka HPC e ka mahana. Ke piʻi aʻe ka mahana, e emi ana kona solubility i ka wai.
3. Viscosity a me ka rheology
HEC: ʻO ka hydroxyethyl cellulose ka viscosity kiʻekiʻe i loko o ka wai a hōʻike i nā waiwai o kahi wai pseudoplastic, ʻo ia hoʻi ka ʻoki ʻoki. Ke hoʻohana ʻia ka shear, e emi ana kona viscosity, e maʻalahi ka hoʻohana ʻana a me ka hoʻohana ʻana.
HPC: ʻO ka hydroxypropyl cellulose he viscosity haʻahaʻa a hōʻike i ka pseudoplasticity like i ka hopena. Hiki i nā ʻoluʻolu HPC ke hana i nā colloid transparent, akā ʻoi aku ka haʻahaʻa o ko lākou viscosity ma mua o HEC.
4. Nā wahi noi
HEC: Hoʻohana nui ʻia ʻo Hydroxyethyl cellulose i nā uhi, nā mea kūkulu hale, nā mea hoʻonaninani, nā mea holoi a me nā māla ʻē aʻe. Ma ke ʻano he mānoanoa, stabilizer a me ka suspending agent, hiki iā ia ke hoʻomalu pono i ka viscosity a me ka rheology o ka ʻōnaehana. I loko o nā pena a me nā uhi, pale ʻo HEC i ka hoʻopaʻa ʻana o ka puaʻa a hoʻomaikaʻi i ka pae ʻana o ka uhi.
HPC: Hoʻohana nui ʻia ka Hydroxypropyl cellulose i ka lāʻau lapaʻau, ka meaʻai, nā mea hoʻonaninani a me nā māla ʻē aʻe. I ka ʻoihana lāʻau lapaʻau, hoʻohana maʻamau ʻia ʻo HPC ma ke ʻano he mea hoʻopaʻa a hoʻokuʻu ʻia ka mea hoʻokuʻu no nā papa. I ka ʻoihana meaʻai, hiki ke hoʻohana ʻia e like me ka mānoanoa a me ka emulsifier. Ma muli o kona hoʻoheheʻe ʻia i nā mea hoʻoheheʻe organik, hoʻohana ʻia ka HPC i kekahi mau mea uhi a me nā mea membrane.
5. Paʻa a paʻa
HEC: ʻO ka hydroxyethyl cellulose he paʻa kemika maikaʻi a paʻa, ʻaʻole hiki ke hoʻololi i ka pH, a paʻa mau i ka wā mālama. Noho paʻa ka HEC ma lalo o nā kūlana pH kiʻekiʻe a haʻahaʻa.
HPC: He mea maʻalahi ka Hydroxypropyl cellulose i ka hoʻololi ʻana i ka mahana a me ka pH, a ua maʻalahi i ka gelation ʻoi aku ka nui ma nā wela kiʻekiʻe. ʻOi aku ka maikaʻi o kona kūpaʻa ma lalo o nā kūlana acidic, akā e hoʻemi ʻia kona kūpaʻa ma lalo o nā kūlana alkaline.
6. Kaiapuni a me ka biodegradability
HEC: ʻO ka hydroxyethyl cellulose he mea ia o ka cellulose maoli, he biodegradability maikaʻi a he mea aloha kaiapuni.
HPC: ʻO ka hydroxypropyl cellulose kekahi mea biodegradable, akā ʻokoʻa paha kona ʻano hoʻohaʻahaʻa ma muli o kona hoʻoheheʻe ʻia a me ka ʻokoʻa o nā noi.
ʻO ka hydroxyethyl cellulose a me ka hydroxypropyl cellulose ʻelua mau mea waiwai nui o ka cellulose. ʻOiai ua hiki iā lāua ʻelua ke mānoanoa, hoʻopaʻa a hoʻokumu i nā colloids, ma muli o nā ʻokoʻa o ke ʻano, he ʻokoʻa ko lākou i ka solubility, viscosity, a me nā kahua noi. Aia kekahi ʻokoʻa nui i ka paʻa. ʻO ke koho o ka cellulose derivative e hoʻohana ai ma muli o nā pono noi kikoʻī a me nā koi hana.
Ka manawa hoʻouna: ʻAukake-08-2024