1.Hydroxypropyl methyl cellulose
Hydroxypropyl methylcellulosehe ʻano cellulose kona hoʻopuka a me ka hoʻohana wikiwiki ʻana. He cellulose non-ionic i hui ʻia eter i hana ʻia mai ka pulupulu hoʻomaʻemaʻe 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 ke ʻano o nā hopena. ʻO ka pae o ka hoʻololi ʻana he 1.2-2.0. ʻOkoʻa kona mau waiwai ma muli o ka ratio o ka methoxyl content i ka hydroxypropyl content.
(1) Hiki ke hoʻoheheʻe ʻia ka Hydroxypropyl methylcellulose i ka wai anuanu, a e loaʻa iā ia nā pilikia i ka hoʻoheheʻe ʻana i ka wai wela. Akā ʻoi aku ka kiʻekiʻe o ka mahana o ka gelation i ka wai wela ma mua o ka methyl cellulose. Hoʻomaikaʻi maikaʻi ʻia ka solubility i ka wai anuanu ke hoʻohālikelike ʻia me ka methyl cellulose.
(2) (2) ʻO ka viscosity o ka hydroxypropyl methylcellulose e pili ana i kona kaumaha mole, a ʻoi aku ka nui o ke kaumaha mole, ʻoi aku ka kiʻekiʻe o ka viscosity. Hoʻopili ka mahana i kona viscosity, i ka piʻi ʻana o ka mahana, emi ka viscosity. Eia naʻe, ʻoi aku ka haʻahaʻa o ka mana o kona viscosity kiʻekiʻe a me ka mahana ma mua o ka methyl cellulose. Paʻa kona hopena ke mālama ʻia ma ka lumi wela.
(3) ʻO ka paʻa ʻana o ka wai o ka hydroxypropyl methylcellulose e pili ana i kona nui hoʻohui, viscosity, a me nā mea ʻē aʻe, a ʻoi aku ka kiʻekiʻe o ka paʻa ʻana o ka wai ma lalo o ka nui hoʻohui like ma mua o ka methyl cellulose.
(4) Hydroxypropyl methylcellulose paʻa i ka waikawa a me ka alkali, a paʻa loa kona ʻano wai i ka pae o ka pH = 2 ~ 12. ʻAʻole liʻiliʻi ka hopena o ka soda a me ka wai lime i kāna hana, akā hiki i ka alkali ke hoʻolalelale a hoʻonui iki i kona viscosity. ʻO ka Hydroxypropyl methylcellulose paʻa i nā paʻakai maʻamau, akā inā kiʻekiʻe ke kiʻekiʻe o ka paʻakai paʻakai, piʻi ka viscosity o ka hydroxypropyl methylcellulose solution.
(5) Hiki ke hoʻohui ʻia ka Hydroxypropyl methylcellulose me nā polymers hiki ke hoʻoheheʻe ʻia i ka wai e hana i kahi hopena homogeneous, kiʻekiʻe-viscosity. E like me ka waiʻona polyvinyl, starch ether, mea ʻai meaʻai, etc.
(6) He ʻoi aku ka maikaʻi o ke kūpaʻa ʻana o ka enzyme hydroxypropyl methylcellulose ma mua o ka methylcellulose, a ʻoi aku ka liʻiliʻi o ka hoʻohaʻahaʻa ʻia e nā enzyme ma mua o ka methylcellulose.
(7) ʻOi aku ka kiʻekiʻe o ka hoʻopili ʻana o ka hydroxypropyl methylcellulose i ke kūkulu ʻana i ka mortar ma mua o ka methylcellulose.
2. Hydroxyethyl cellulose
Hana ʻia ia mai ka pulupulu hoʻomaʻemaʻe i mālama ʻia me ka alkali, a hana ʻia me ka ethylene oxide ma ke ʻano he etherification agent i mua o ka isopropanol. ʻO ka nui o ka hoʻololi ʻana he 1.5-2.0. Loaʻa iā ia ka hydrophilicity ikaika a maʻalahi ke komo i ka wai.
(1) Hiki ke hoʻoheheʻe ʻia ka hydroxyethyl cellulose i ka wai anuanu, akā paʻakikī ke hoʻoheheʻe i ka wai wela. Paʻa kona hopena i ka wela kiʻekiʻe me ka ʻole o ka gelling. Hiki ke hoʻohana ʻia no ka manawa lōʻihi ma lalo o ke kiʻekiʻe o ka wela i ka mortar, akā ʻoi aku ka haʻahaʻa o kona paʻa wai ma mua o ka methyl cellulose.
(2)Hydroxyethyl cellulosepaʻa i ka waika maʻamau a me ka alkali, a hiki i ka alkali ke hoʻolōʻihi i kona hemo a hoʻonui iki i kona viscosity. ʻOi aku ka maikaʻi o kona dispersibility i ka wai ma mua o ka methyl cellulose a me ka hydroxypropyl methyl cellulose.
(3) He hana anti-sag maikaʻi ka Hydroxyethyl cellulose no ka mortar, akā ʻoi aku ka lōʻihi o ka manawa hoʻomaha no ka sima.
(4) He haʻahaʻa loa ka hana o ka hydroxyethyl cellulose i hana ʻia e kekahi mau ʻoihana kūloko ma mua o ka methyl cellulose ma muli o kona kiʻekiʻe o ka wai a me ka nui o ka lehu.
(5) He mea koʻikoʻi ka malili o ka wai wai o ka hydroxyethyl cellulose. Ma kahi mahana ma kahi o 40°C, hiki mai ka malili i loko o 3 a 5 mau lā, e hoʻopilikia i kāna hana.
Ka manawa hoʻouna: Apr-28-2024