ʻO ka Hydroxypropyl methylcellulose kahi polymer hiki ke hoʻoheheʻe ʻia i ka wai e hana i kahi hopena maʻemaʻe a paʻa i ka wai a hoʻohana nui ʻia i ka lāʻau lapaʻau, meaʻai a me nā ʻoihana hana. ʻO ia ka non-ionic cellulose-based raw material e hoʻomaikaʻi i ka hoʻopaʻa ʻana a me nā waiwai cohesive o ka huahana hope. I mea e hōʻoia ai i ka hana kiʻekiʻe o ka hydroxypropyl methylcellulose, pono e hoʻāʻo ʻia ka huahana ma mua o ka hoʻohana ʻana. Ma kēia ʻatikala, e kūkākūkā mākou i ʻekolu ala hilinaʻi e haʻi i ka maikaʻi o ka hydroxypropyl methylcellulose.
1. Hoao viscosity
ʻO ka viscosity o ka hydroxypropyl methylcellulose kahi mea nui e hoʻoholo ai i kona ʻano. ʻO ka viscosity ke kūʻē o kahi wai e kahe a ua ana ʻia i ke keneta (cps) a i ʻole mPa.s. ʻOkoʻa ka viscosity o ka hydroxypropyl methylcellulose e like me kona kaumaha molekala a me ke kiʻekiʻe o ka hoʻololi. ʻO ke kiʻekiʻe o ke kiʻekiʻe o ka hoʻololi ʻana, ʻoi aku ka haʻahaʻa o ka viscosity o ka huahana.
No ka ho'āʻoʻana i ka viscosity o hydroxypropyl methylcellulose, e hoʻoheheʻe i kahi liʻiliʻi o ka huahana i ka wai a hoʻohana i ka viscometer e ana i ka viscosity o ka hopena. Pono ka viscosity o ka hoʻonā i loko o ka laulā i hāʻawi ʻia e ka mea hoʻolako huahana. ʻO kahi huahana hydroxypropyl methylcellulose maikaʻi e loaʻa i ka viscosity kūlike, ʻo ia ka hōʻailona o ka maʻemaʻe a me ka nui o ka nui o ka nui.
2. Ho'āʻo hoʻololi
ʻO ka degere o ka hoʻololi ʻana e pili ana i ka ratio o ka helu o nā pūʻulu hydroxyl ma cellulose i pani ʻia e nā hui hydroxypropyl a i ʻole methyl. ʻO ke kiʻekiʻe o ka hoʻololi ʻana he hōʻailona o ka maʻemaʻe o ka huahana, ʻoi aku ka kiʻekiʻe o ke kiʻekiʻe o ka hoʻololi ʻana, ʻoi aku ka maʻemaʻe o ka huahana. Pono nā huahana hydroxypropyl methylcellulose kiʻekiʻe i kahi kiʻekiʻe o ka hoʻololi.
No ka hoʻāʻo ʻana i ke ʻano o ka hoʻololi ʻana, hana ʻia kahi titration me ka sodium hydroxide a me ka waika hydrochloric. E hoʻoholo i ka nui o ka sodium hydroxide e pono ai e hoʻokaʻawale i ka hydroxypropyl methylcellulose a e helu i ke degere o ka hoʻololi ʻana me ka hoʻohana ʻana i kēia ʻano:
Degree of Substitution = ([Volume o NaOH] x [Molarity o NaOH] x 162) / ([Ke kaumaha o Hydroxypropyl Methyl Cellulose] x 3)
Pono ka degere o ka hoʻololi ʻana i loko o ka laulā i ʻōlelo ʻia e ka mea hoʻolako huahana. Pono ka degere o ka hoʻololi ʻana i nā huahana hydroxypropyl methylcellulose kiʻekiʻe i loko o ka pae i ʻōlelo ʻia.
3. Ho'āʻo solubility
ʻO ka solubility o ka hydroxypropyl methylcellulose kekahi mea nui e hoʻoholo ai i kona maikaʻi. Pono e hoʻoheheʻe ʻia ka huahana i loko o ka wai a ʻaʻole e hana i nā puʻupuʻu a i ʻole nā gels. Pono nā huahana hydroxypropyl methylcellulose kiʻekiʻe e hoʻoheheʻe me ka wikiwiki.
No ka hana ʻana i kahi hoʻāʻo solubility, e hoʻoheheʻe i kahi hua liʻiliʻi i loko o ka wai a hoʻoulu i ka hopena a hiki i ka pau ʻana. Pono e maʻemaʻe ka hoʻonā ʻana mai nā lumps a i ʻole nā gels. Inā ʻaʻole hiki ke hoʻoheheʻe ʻia ka huahana a i ʻole he mau puʻupuʻu a gels paha, he hōʻailona ia o ka maikaʻi ʻole.
I ka hopena, ʻo ka hydroxypropyl methylcellulose kahi mea waiwai waiwai i hoʻohana ʻia i nā ʻoihana like ʻole. I mea e hōʻoia ai i ke kūlana kiʻekiʻe o ka huahana, lawe ʻia nā hoʻokolohua viscosity, hoʻololi a me ka solubility. E kōkua kēia mau ho'āʻo e hoʻomaopopo pono i nā ʻano o ka huahana a kōkua i ka hoʻokaʻawale ʻana i kona ʻano. ʻO ka hydroxypropyl methylcellulose kūlana kiʻekiʻe he viscosity kūlike, kiʻekiʻe o ka hoʻololi ʻana, a hemo wikiwiki a kūlike i ka wai.
Ka manawa hoʻouna: Jul-11-2023