ʻO ka hana ʻana i ka hydroxyethyl cellulose (HEC) e pili ana i ke ʻano o nā hopena kemika e hoʻololi i ka cellulose, kahi polymer kūlohelohe i loaʻa mai nā mea kanu. Hoʻohana nui ʻia ʻo HEC i nā ʻoihana like ʻole, me nā lāʻau lapaʻau, nā mea hoʻonaninani, nā meaʻai, a me ke kūkulu ʻana, ma muli o kona mānoanoa, kūpaʻa, a me nā waiwai mālama wai.
Introduction to Hydroxyethyl Cellulose (HEC)
ʻO ka Hydroxyethyl cellulose (HEC) he polymer non-ionic, wai-soluble i loaʻa mai ka cellulose ma o ka hoʻololi kemika. Hoʻohana nui ʻia ia ma ke ʻano he mānoanoa, gelling, a stabilizing agent i nā ʻoihana like ʻole.
Mea Maka
Cellulose: ʻO ka mea mua no ka hana HEC. Hiki ke kiʻi ʻia mai ka cellulose mai nā mea kanu like ʻole e like me ka pulp lāʻau, ka pulupulu, a i ʻole nā koena mahiʻai.
Ethylene Oxide (EO): He kemika nui i hoʻohana ʻia e hoʻokomo i nā pūʻulu hydroxyethyl ma ka iwi kuamoʻo.
Alkali: Hoʻohana maʻamau ka sodium hydroxide (NaOH) a i ʻole potassium hydroxide (KOH) ma ke ʻano he catalyst i ka hopena.
Kaʻina Hana Hana
ʻO ka hana ʻana o HEC e pili ana i ka etherification o cellulose me ka ethylene oxide ma lalo o nā kūlana alkaline.
Hōʻike kēia mau ʻanuʻu i ke kaʻina hana:
1. Hana mua i ka Cellulose
Hoʻomaʻemaʻe mua ʻia ʻo Cellulose e wehe i nā haumia e like me lignin, hemicellulose, a me nā extractives ʻē aʻe. Hoʻomaloʻo ʻia ka cellulose i hoʻomaʻemaʻe ʻia i kahi maʻamau maʻamau.
2. Etherification Reaction
Ka hoʻomākaukau ʻana i ka ʻalaʻala: Hoʻomākaukau ʻia kahi hopena wai o ka sodium hydroxide (NaOH) a i ʻole potassium hydroxide (KOH). He mea koʻikoʻi ka neʻe ʻana o ka solution alkali a pono e hoʻopaʻa ʻia ma muli o ke kiʻekiʻe makemake o ka hoʻololi ʻana (DS) o ka huahana hope.
Hoʻonohonoho hoʻoponopono: Hoʻopuehu ʻia ka cellulose i hoʻomaʻemaʻe ʻia i ka hopena alkali. Hoʻomaʻamaʻa ʻia ka hui ʻana i kahi mahana kikoʻī, ma kahi o 50-70 ° C, e hōʻoia i ka pehu ʻana o ka cellulose a hiki ke loaʻa no ka hopena.
Hoʻohui ʻia o Ethylene Oxide (EO): Hoʻohui mālie ʻia ka Ethylene oxide (EO) i ka ipu hoʻoneʻe me ka mālama ʻana i ka mahana a me ka hoʻoulu ʻana mau. He exothermic ka hopena, no laila he mea koʻikoʻi ka mālama ʻana i ka wela e pale i ka wela.
Ka nānā 'ana i ka pane: E nānā 'ia ka holomua o ka hopena ma ka nānā 'ana i nā la'ana i nā manawa ma'amau. Hiki ke hoʻohana ʻia nā ʻenehana like Fourier-transform infrared spectroscopy (FTIR) no ka hoʻoholo ʻana i ke kiʻekiʻe o ka hoʻololi ʻana (DS) o nā hui hydroxyethyl ma ka iwi kuamoʻo cellulose.
Neutralization a me ka holoi ʻana: Ke hoʻokō ʻia ka DS i makemake ʻia, hoʻopau ʻia ka pane ʻana ma ka hoʻokaʻawale ʻana i ka hopena alkaline me kahi waikawa, maʻamau acetic acid. ʻO ka hopena HEC e holoi pono ʻia me ka wai e hoʻoneʻe i nā reagents a me nā haumia ʻole.
3. Ka hoomaemae a me ka maloo ana
Hoʻomaʻemaʻe hou ʻia ka HEC i holoi ʻia ma o ka kānana a i ʻole ka centrifugation e wehe i nā mea haumia i koe. Hoʻomaloʻo ʻia ka HEC i hoʻomaʻemaʻe ʻia i kahi maʻamau maʻamau no ka loaʻa ʻana o ka huahana hope.
Ka Mana Mana
Pono ka mana maikaʻi i loko o ke kaʻina hana HEC e hōʻoia i ka kūlike a me ka maʻemaʻe o ka huahana hope. ʻO nā ʻāpana koʻikoʻi e nānā ai:
Degere o ka pani ʻana (DS)
ʻO ka viscosity
ʻoluʻolu
pH
Maʻemaʻe (kaʻole o nā haumia)
Hoʻohana maʻamau ʻia nā ʻenehana loiloi e like me FTIR, ana viscosity, a me elemental analysis no ka mālama ʻana i ka maikaʻi.
Nā noi no ka Hydroxyethyl Cellulose (HEC)
Loaʻa iā HEC nā noi i nā ʻoihana like ʻole ma muli o kāna mau waiwai nui:
Lapaʻau Lapaʻau: Hoʻohana ʻia ma ke ʻano he mea mānoanoa i ka hoʻokuʻu ʻana i ka waha, nā ʻano kumuhana, a me nā ʻōnaehana hoʻokuʻu lāʻau.
Mea hoʻomaʻamaʻa: Hoʻohana maʻamau ʻia i nā ʻaila, nā lotions, a me nā shampoos ma ke ʻano he mānoanoa a me ka stabilizer.
Meaʻai: Hoʻohui ʻia i nā huahana meaʻai ma ke ʻano he mānoanoa a me ka gelling agent, emulsifier, a me ka stabilizer.
Hana ʻia: Hoʻohana ʻia i loko o nā morta a me nā grouts e hoʻomaikaʻi i ka hana a me ka paʻa ʻana o ka wai.
Nā Manaʻo Kaiapuni a me ka Maluhia
Ka hopena o ke kaiapuni: ʻO ka hana ʻana o HEC e pili ana i ka hoʻohana ʻana i nā kemika e like me ka ethylene oxide a me nā alkalis, hiki ke loaʻa i nā hopena kūlohelohe. ʻO ka mālama ʻana i nā ʻōpala kūpono a me ka mālama ʻana i nā lula he mea nui e hōʻemi i ka hopena o ke kaiapuni.
Palekana: ʻO ka ethylene oxide he kinoea hoʻowali a hiki ke hoʻopau i ka palekana i ka wā e lawelawe ai a mālama ʻia. Pono nā ea kūpono, nā lako pale pilikino (PPE), a me nā protocol palekana e hōʻoia i ka palekana o ka limahana.
ʻO ka Hydroxyethyl cellulose (HEC) he polymer waiwai me nā noi like ʻole i nā ʻoihana mai nā lāʻau lapaʻau a hiki i ke kūkulu ʻana. ʻO kāna hana e pili ana i ka etherification o cellulose me ka ethylene oxide ma lalo o nā kūlana alkaline. He mea koʻikoʻi nā ana hoʻomalu maikaʻi e hōʻoia i ka kūlike a me ka maʻemaʻe o ka huahana hope. Pono e noʻonoʻo ʻia ka noʻonoʻo a me ka palekana i ke kaʻina hana. Ma ka hahai ʻana i nā kaʻina hana a me nā protocols kūpono, hiki ke hana maikaʻi ʻia ka HEC me ka hōʻemi ʻana i ka hopena o ke kaiapuni a me ka hōʻoia ʻana i ka palekana o ka limahana.
Hoʻopili kēia alakaʻi piha i ke kaʻina hana o ka hydroxyethyl cellulose (HEC) i nā kikoʻī, mai nā mea maka a hiki i ka mana maikaʻi a me nā noi, e hāʻawi ana i ka ʻike piha o kēia kaʻina hana polymer koʻikoʻi.
Ka manawa hoʻouna: Apr-10-2024