ʻO Hydroxypropyl Methylcellulose (HPMC) kahi mea nui o ka cellulose ether derivative i hoʻohana nui ʻia ma nā ʻoihana he nui ma muli o kona mau waiwai kino a me ke kemika kū hoʻokahi. ʻO kona mau waiwai viscosity kekahi o nā waiwai koʻikoʻi o HPMC, e pili pono ana i kāna hana ma nā noi like ʻole.
1. Nā waiwai kumu o HPMC
ʻO HPMC kahi ʻetera cellulose nonionic i loaʻa ma ke pani ʻana i kahi hapa o nā hui hydroxyl (–OH) i loko o ka molekole cellulose me nā hui methoxy (–OCH3) a me nā hui hydroxypropyl (–OCH2CH(OH)CH3). Loaʻa iā ia ka solubility maikaʻi i ka wai a me kekahi mau mea hoʻoheheʻe organik, e hana ana i nā hopena colloidal moakaka. Hoʻoholo nui ʻia ka viscosity o HPMC e kona kaumaha molekala, ke kekelē o ka pani (DS, Degree of Substitution) a me ka hoʻolaha substituent.
2. Ka hoʻoholo ʻana o ka mānoanoa o HPMC
Hoʻohana pinepine ʻia ka viscosity o nā hopena HPMC me ka hoʻohana ʻana i ka viscometer rotational a i ʻole ka viscometer capillary. I ke ana ʻana, pono e uku ʻia ka nānā ʻana i ka nui, ka mahana a me ka shear rate o ka hopena, no ka mea, hiki i kēia mau mea ke hoʻopilikia nui i ka waiwai viscosity.
Ka nui o ka hopena: Piʻi ka mānoanoa o ka HPMC me ka piʻi ʻana o ka nui o ka hopena. Ke emi ka nui o ka hopena HPMC, nāwaliwali ka pilina ma waena o nā molekala a emi ka mānoanoa. I ka piʻi ʻana o ka nui, piʻi ka hihia a me ka pilina ma waena o nā molekala, e hoʻonui nui ana i ka mānoanoa.
Mahana: He ʻano koʻikoʻi loa ka mānoanoa o nā hopena HPMC i ka mahana. Ma ke ʻano laulā, i ka piʻi ʻana o ka mahana, e emi ana ka mānoanoa o ka hopena HPMC. ʻO kēia ma muli o ka piʻi ʻana o ka mahana e alakaʻi ana i ka neʻe ʻana o ka molekala a me ka nāwaliwali o nā pilina intermolecular. Pono e hoʻomaopopo ʻia he ʻokoʻa ka ʻike o ka HPMC me nā kekelē like ʻole o ka pani ʻana a me ke kaumaha molekala i ka mahana.
Ka wikiwiki o ke kuʻi ʻana: Hōʻike nā hopena HPMC i ke ʻano pseudoplastic (shear thinning), ʻo ia hoʻi, ʻoi aku ke kiʻekiʻe o ka viscosity ma nā wikiwiki kuʻi haʻahaʻa a emi iho ma nā wikiwiki kuʻi kiʻekiʻe. ʻO kēia ʻano ma muli o nā mana kuʻi e hoʻonohonoho ana i nā kaulahao molekala ma ke kuhikuhi kuʻi ʻana, no laila e hōʻemi ana i nā entanglements a me nā pilina ma waena o nā molekala.
3. Nā mea e pili ana i ka mānoanoa o ka HPMC
Kaumaha molekala: ʻO ke kaumaha molekala o HPMC kekahi o nā kumu nui e hoʻoholo ai i kona mānoanoa. Ma ke ʻano laulā, ʻo ka nui o ke kaumaha molekala, ʻo ke kiʻekiʻe o ka mānoanoa o ka hopena. ʻO kēia no ka mea ʻoi aku ka nui o nā molekala HPMC me ke kaumaha molekala kiʻekiʻe e hana i nā pūnaewele hihia, a laila e hoʻonui ai i ka friction kūloko o ka hopena.
Ke kēkelē o ka hoʻololi a me ka hoʻolaha ʻana o nā mea pani: ʻO ka helu a me ka hoʻolaha ʻana o nā mea pani methoxy a me hydroxypropyl i loko o HPMC e hoʻopilikia pū i kona viscosity. Ma keʻano laulā, ʻo ke kiʻekiʻe o ke kēkelē o ka hoʻololi ʻana o ka methoxy (DS), ʻo ka haʻahaʻa o ka viscosity o HPMC, no ka mea, ʻo ka hoʻokomo ʻana o nā mea pani methoxy e hōʻemi i ka ikaika hoʻopaʻa hydrogen ma waena o nā molekala. ʻO ka hoʻokomo ʻana o nā mea pani hydroxypropyl e hoʻonui i nā pilina intermolecular, a laila e hoʻonui ai i ka viscosity. Eia kekahi, ʻo ka hoʻolaha like ʻana o nā mea pani e kōkua i ka hoʻokumu ʻana i kahi ʻōnaehana hopena paʻa a hoʻonui i ka viscosity o ka hopena.
ka waiwai pH o ka hopena: ʻOiai ʻo HPMC kahi polymer non-ionic a ʻaʻole pili kona viscosity i nā loli i ka waiwai pH o ka hopena, ʻo nā waiwai pH koʻikoʻi (ʻakika loa a alkaline paha) hiki ke hoʻoulu i ka hōʻino ʻana o ke ʻano molekala o HPMC, a laila e hoʻopilikia ana i ka viscosity.
4. Nā kahua noi o HPMC
Ma muli o kona mau ʻano mānoanoa maikaʻi loa, hoʻohana nui ʻia ʻo HPMC ma nā ʻano he nui:
Nā mea kūkulu hale: I nā mea kūkulu hale, hoʻohana ʻia ʻo HPMC ma ke ʻano he mea hoʻomānoanoa a me ka mea paʻa wai e hoʻomaikaʻi i ka hana kūkulu a hoʻonui i ke kū'ē ʻana i nā māwae.
ʻOihana lāʻau lapaʻau: Ma ka ʻoihana lāʻau lapaʻau, hoʻohana ʻia ʻo HPMC ma ke ʻano he mea hoʻopaʻa no nā papa, he mea hana kiʻiʻoniʻoni no nā capsules a me kahi mea lawe no nā lāʻau lapaʻau hoʻokuʻu mau.
ʻOihana meaʻai: Hoʻohana ʻia ʻo HPMC ma ke ʻano he mea hoʻomānoanoa a me ka mea hoʻopaʻa i ka ʻoihana meaʻai no ka hana ʻana i ka hau kalima, ka jelly a me nā huahana waiū.
Nā huahana kemika o kēlā me kēia lā: I nā huahana kemika o kēlā me kēia lā, hoʻohana ʻia ʻo HPMC ma ke ʻano he thickener a me ka stabilizer no ka hana ʻana o ka shampoo, shower gel, toothpaste, etc.
ʻO nā ʻano mānoanoa o HPMC ke kumu no kāna hana maikaʻi loa i nā noi like ʻole. Ma ka kaohi ʻana i ke kaumaha molekala, ke kekelē o ka hoʻololi ʻana, a me nā kūlana hoʻonā o HPMC, hiki ke hoʻoponopono ʻia kona mānoanoa e hoʻokō i nā pono noi like ʻole. I ka wā e hiki mai ana, ʻo ka noiʻi hohonu e pili ana i ka pilina ma waena o ke ʻano molekala HPMC a me ka mānoanoa e kōkua i ka hoʻomohala ʻana i nā huahana HPMC me ka hana maikaʻi aʻe a hoʻonui hou i kāna mau kahua noi.
Ka manawa hoʻouna: Iulai-20-2024