ʻO ka Hydroxyethyl Cellulose (HEC)he ether cellulose nonionic wai-soluble, kahi i hoʻohana nui ʻia i nā uhi, nā mea kūkulu hale, nā lāʻau lapaʻau, nā kemika o kēlā me kēia lā a me nā ʻoihana ʻē aʻe. Eia nō naʻe, he kiʻekiʻe ka solubility wai o HEC a nāwaliwali ka hydrophobicity, kahi e alakaʻi ai i nā palena hana i kekahi mau hiʻohiʻona noi. No laila, ua hoʻokumu ʻia ka hydrophobically modified hydroxyethyl cellulose (HMHEC) e hoʻomaikaʻi i kona mau waiwai rheological, ka hiki ke mānoanoa, ka paʻa emulsification a me ke kūpaʻa wai.
1. Ke koʻikoʻi o ka hoʻololi hydrophobic o ka hydroxyethyl cellulose
Ka hoʻomaikaʻi ʻana i nā waiwai mānoanoa a me nā waiwai rheological
Hiki i ka hoʻololi hydrophobic ke hoʻomaikaʻi nui i ka hiki ke mānoanoa o HEC, ʻoi aku hoʻi ma nā helu shear haʻahaʻa. Hōʻike ia i kahi viscosity kiʻekiʻe, kahi e kōkua ai i ka hoʻomaikaʻi ʻana i ka thixotropy a me ka pseudoplasticity o ka ʻōnaehana. He mea nui loa kēia waiwai i nā kahua o nā uhi, nā wai ʻeli ʻaila, nā huahana mālama pilikino, a me nā mea ʻē aʻe, a hiki ke hoʻoikaika i ke kūpaʻa a me ka hopena hoʻohana o ka huahana.
Hoʻomaikaʻi i ke kūpaʻa o ka emulsion
ʻOiai hiki i ka HEC i hoʻololi ʻia ke hana i kahi ʻano pili i loko o ka hopena wai, hoʻomaikaʻi nui ia i ke kūpaʻa o ka emulsion, hiki ke hōʻemi i ka hoʻokaʻawale ʻana o ka aila-wai, a hoʻomaikaʻi i ka hopena emulsification. No laila, he waiwai nui kona hoʻohana ʻana ma nā kahua o nā uhi emulsion, nā huahana mālama ʻili a me nā emulsifiers meaʻai.
Hoʻonui i ke kūpaʻa wai a me nā waiwai hana kiʻiʻoniʻoni
He hydrophilic loa ka HEC kuʻuna a maʻalahi hoʻi e hoʻoheheʻe ʻia i nā wahi haʻahaʻa kiʻekiʻe a i ʻole ka wai, kahi e hoʻopilikia ai i ke kūpaʻa wai o ka mea. Ma o ka hoʻololi hydrophobic, hiki ke hoʻonui ʻia kāna noi i nā uhi, nā mea hoʻopili, ka hana pepa a me nā ʻoihana ʻē aʻe, a hiki ke hoʻomaikaʻi ʻia kona kūpaʻa wai a me nā waiwai hana kiʻiʻoniʻoni.
Hoʻomaikaʻi i nā waiwai lahilahi shear
Hiki i ka HEC i hoʻololi ʻia me ka hydrophobic ke hōʻemi i ka viscosity ma lalo o nā kūlana shear kiʻekiʻe, me ka mālama ʻana i kahi kūlike kiʻekiʻe ma nā helu shear haʻahaʻa, a laila e hoʻomaikaʻi ana i ka hana kūkulu a me ka hōʻemi ʻana i ka hoʻohana ʻana i ka ikehu. He waiwai nui ia i nā ʻoihana e like me ka eli ʻana o ka ʻaila a me nā uhi hoʻolālā.
2. Hoʻololi hydrophobic o ka hydroxyethyl cellulose
Hoʻokō pinepine ʻia ka hoʻololi hydrophobic HEC ma ka hoʻolauna ʻana i nā hui hydrophobic e hoʻoponopono i kona solubility a me nā waiwai mānoanoa ma o ka grafting kemika a i ʻole ka hoʻololi kino. ʻO nā ʻano hoʻololi hydrophobic maʻamau penei:
Hoʻopili ʻana i ka hui hydrophobic
Ke hoʻokomo nei i ka alkyl (e like me hexadecyl), aryl (e like me phenyl), siloxane a i ʻole nā hui fluorinated ma ka molekole HEC ma o ka hopena kemika e hoʻomaikaʻi i kona hydrophobicity. Eia kekahi laʻana:
Ke hoʻohana nei i ka esterification a i ʻole ka hopena etherification e hoʻopili i ka alkyl kaulahao lōʻihi, e like me hexadecyl a i ʻole octyl, e hana i kahi ʻano hui hydrophobic.
Ke hoʻolauna nei i nā hui silicone ma o ka hoʻololi ʻana o ka siloxane e hoʻomaikaʻi i kona kūpaʻa wai a me ka lubricity.
Ke hoʻohana nei i ka hoʻololi fluorination e hoʻomaikaʻi i ke kūpaʻa ʻana i ka wā a me ka hydrophobicity, e kūpono ai no nā uhi kiʻekiʻe a i ʻole nā noi kaiapuni kūikawā.
Hoʻololi ʻana i ka Copolymerization a i ʻole ke cross-linking
Ma ka hoʻokomo ʻana i nā comonomers (e like me nā acrylates) a i ʻole nā mea hoʻopili keʻa (e like me nā resins epoxy) e hana i kahi pūnaewele keʻa, ua hoʻomaikaʻi ʻia ke kūpaʻa wai a me ka hiki ke mānoanoa o HEC. No ka laʻana, ʻo ka hoʻohana ʻana i ka HEC i hoʻololi ʻia i ka hydrophobically i loko o nā emulsions polymer hiki ke hoʻonui i ke kūpaʻa a me ka hopena mānoanoa o ka emulsion.
Hoʻololi kino
Ma ka hoʻohana ʻana i ka ʻenehana adsorption ʻili a i ʻole ka ʻenehana uhi ʻana, ua uhi ʻia nā mole hydrophobic ma luna o ka ʻili o HEC e hana i kahi hydrophobicity. He ʻano akahai kēia ʻano hana a kūpono no nā noi me nā koi kiʻekiʻe no ke kūpaʻa kemika, e like me ka meaʻai a me nā lāʻau lapaʻau.
Hoʻololi ʻana i ka hui hydrophobic
Ma ka hoʻokomo ʻana i kahi liʻiliʻi o nā hui hydrophobic ma ka molekala HEC, hana ia i kahi hui pili i loko o ka hopena wai, a laila e hoʻomaikaʻi ana i ka hiki ke mānoanoa. Hoʻohana nui ʻia kēia ʻano hana i ka hoʻomohala ʻana i nā mea hoʻomānoanoa hana kiʻekiʻe a kūpono no nā uhi ʻana, nā kemika kahua aila a me nā kahua ʻē aʻe.
Hoʻololi hydrophobic ohydroxyethyl cellulosehe ala koʻikoʻi ia e hoʻomaikaʻi ai i kāna hana noi, hiki ke hoʻonui i kona hiki ke hoʻomānoanoa, ka paʻa emulsification, ke kūpaʻa wai a me nā waiwai rheological. ʻO nā ʻano hoʻololi maʻamau e pili ana i ka hydrophobic group grafting, copolymerization a i ʻole ka hoʻololi ʻana i ke cross-linking, ka hoʻololi kino a me ka hoʻololi ʻana i ka hui hydrophobic. ʻO ke koho kūpono o nā ʻano hoʻololi hiki ke hoʻonui i ka hana o HEC e like me nā koi noi like ʻole, i mea e pāʻani ai i kahi kuleana nui ma nā ʻano he nui e like me nā uhi hoʻolālā, nā kemika kahua aila, ka mālama pilikino, a me ka lāʻau lapaʻau.
Ka manawa hoʻouna: Malaki-25-2025