1.Hydroxypropyl methyl cellulose
Hydroxypropyl methylcellulosehe ʻano cellulose nona ka hana a me ka hoʻohana ʻana e piʻi wikiwiki nei. He ʻetera hui ʻole cellulose non-ionic i hana ʻia mai ka pulupulu i hoʻomaʻemaʻe ʻia ma hope o ka alkalization, me ka hoʻohana ʻana i ka propylene oxide a me ka methyl chloride ma ke ʻano he etherification agent, ma o kahi moʻo o nā hopena. ʻO ke kekelē o ka pani ʻana he 1.2 ~ 2.0. ʻOkoʻa kona mau waiwai ma muli o ka lakio o ka ʻike methoxyl i ka ʻike hydroxypropyl.
(1) He maʻalahi ka hoʻoheheʻe ʻana o ka Hydroxypropyl methylcellulose i ka wai anuanu, a e pilikia ana ia i ka hoʻoheheʻe ʻana i ka wai wela. Akā, ʻoi aku ka kiʻekiʻe o kona mahana gelation i ka wai wela ma mua o ka methyl cellulose. Ua hoʻomaikaʻi nui ʻia ka solubility i ka wai anuanu i hoʻohālikelike ʻia me ka methyl cellulose.
(2) (2) Pili ka mānoanoa o ka hydroxypropyl methylcellulose i kona kaumaha molekala, a ʻo ka nui o ke kaumaha molekala, ʻo ka kiʻekiʻe o ka mānoanoa. Hoʻopilikia pū ka mahana i kona mānoanoa, i ka piʻi ʻana o ka mahana, e emi ana ka mānoanoa. Eia naʻe, ʻoi aku ka haʻahaʻa o ka mana o kona mānoanoa kiʻekiʻe a me ka mahana ma mua o ka methyl cellulose. Paʻa kona hopena ke mālama ʻia ma ka mahana o ka lumi.
(3) ʻO ka paʻa ʻana o ka wai o ka hydroxypropyl methylcellulose e pili ana i kona nui hoʻohui, ka viscosity, a me nā mea ʻē aʻe, a ʻo kona helu paʻa wai ma lalo o ka nui hoʻohui like ʻoi aku ke kiʻekiʻe ma mua o ka methyl cellulose.
(4) Paʻa ka Hydroxypropyl methylcellulose i ka waikawa a me ka alkali, a paʻa loa kona hopena wai ma ka pae pH = 2 ~ 12. ʻAʻole nui ka hopena o ka soda caustic a me ka wai lime i kāna hana, akā hiki i ka alkali ke hoʻolalelale i kona wikiwiki hoʻoheheʻe a hoʻonui iki i kona viscosity. Paʻa ka Hydroxypropyl methylcellulose i nā paʻakai maʻamau, akā i ka wā e kiʻekiʻe ai ka nui o ka hopena paʻakai, e piʻi aʻe ka viscosity o ka hopena hydroxypropyl methylcellulose.
(5) Hiki ke hoʻohuihui ʻia ka Hydroxypropyl methylcellulose me nā polymers wai-soluble e hana i kahi hopena homogeneous, kiʻekiʻe-viscosity. E like me ka polyvinyl alcohol, starch ether, vegetable gum, etc.
(6) ʻOi aku ka maikaʻi o ke kūpaʻa ʻana o ka Hydroxypropyl methylcellulose i nā enzyme ma mua o ka methylcellulose, a ʻoi aku ka liʻiliʻi o ka hiki ke hoʻohaumia ʻia kāna hopena e nā enzymes ma mua o ka methylcellulose.
(7) ʻOi aku ke kiʻekiʻe o ka hoʻopili ʻana o ka hydroxypropyl methylcellulose i ke kūkulu ʻana o ka mortar ma mua o ka methylcellulose.
2. Hydroxyethyl cellulose
Hana ʻia ia mai ka pulupulu i hoʻomaʻemaʻe ʻia i mālama ʻia me ka alkali, a hoʻopili ʻia me ka ethylene oxide ma ke ʻano he etherification agent i ke alo o isopropanol. ʻO kona kekelē o ka hoʻololi ʻana he 1.5 ~ 2.0. He hydrophilicity ikaika kona a maʻalahi hoʻi e omo i ka makū.
(1) Hiki ke hoʻoheheʻe ʻia ka Hydroxyethyl cellulose i ka wai anuanu, akā paʻakikī ke hoʻoheheʻe ʻia i ka wai wela. Paʻa kona hopena i ka mahana kiʻekiʻe me ka ʻole o ka gelling. Hiki ke hoʻohana ʻia no ka manawa lōʻihi ma lalo o ka mahana kiʻekiʻe i loko o ka mortar, akā ʻoi aku ka haʻahaʻa o kona paʻa ʻana i ka wai ma mua o ka methyl cellulose.
(2)ʻO ka cellulose hydroxyethylhe paʻa i ka waikawa maʻamau a me ka alkali, a hiki i ka alkali ke hoʻolalelale i kona hoʻoheheʻe ʻana a hoʻonui iki i kona viscosity. ʻOi aku ka ʻino o kona dispersibility i ka wai ma mua o ka methyl cellulose a me ka hydroxypropyl methyl cellulose.
(3) Loaʻa i ka Hydroxyethyl cellulose ka hana anti-sag maikaʻi no ka mortar, akā he lōʻihi kona manawa hoʻopaneʻe no ka sima.
(4) ʻO ka hana o ka hydroxyethyl cellulose i hana ʻia e kekahi mau ʻoihana kūloko he haʻahaʻa loa ia ma mua o ka methyl cellulose ma muli o kona nui o ka wai a me ka nui o ka lehu.
(5) He koʻikoʻi ka ʻōpala o ka wai o ka hydroxyethyl cellulose. Ma kahi mahana o 40°C, hiki ke loaʻa ka ʻōpala i loko o 3 a 5 mau lā, kahi e hoʻopilikia ai i kāna hana.
Ka manawa hoʻouna: ʻApelila-28-2024