ʻO ka MC ka methyl cellulose, i loaʻa ma ka mālama ʻana i ka pulupulu hoʻomaʻemaʻe me ka alkali, me ka hoʻohana ʻana i ka methyl chloride ma ke ʻano he etherifying agent, a me ka hana ʻana i ka cellulose ether ma o ke ʻano o nā hopena. ʻO ka maʻamau, ʻo ka degere o ka hoʻololi ʻana he 1.6 ~ 2.0, a ʻokoʻa hoʻi ka solubility me nā pae like ʻole o ka hoʻololi. No ka non-ionic cellulose ether.
(1) Ka paʻa wai omethyl cellulosepili i kona nui hoʻohui, viscosity, particle fineness and dissolution rate. ʻO ka maʻamau, inā nui ka nui o ka hoʻohui, liʻiliʻi ka fineness, a nui ka viscosity, kiʻekiʻe ka nui o ka mālama ʻana i ka wai. Ma waena o lākou, ʻo ka nui o ka hoʻohui ka mea nui loa i ka nui o ka paʻa ʻana o ka wai, a ʻaʻole kūlike ka pae o ka viscosity i ke kiʻekiʻe o ka pae paʻa wai. ʻO ka nui o ka hoʻoheheʻe ʻana ma muli o ke ʻano o ka hoʻololi ʻana o ka ʻili o nā ʻāpana cellulose a me ka maikaʻi o nā ʻāpana. Ma waena o nā cellulose ethers ma luna, ʻo ka methyl cellulose a me ka hydroxypropyl methyl cellulose i ʻoi aku ka nui o ka paʻa wai.
(2) Hiki ke hoʻoheheʻe ʻia ka Methylcellulose i ka wai anuanu, akā paʻakikī ke hoʻoheheʻe ʻia i ka wai wela, a paʻa loa kona ʻano wai i ka pae o ka pH = 3 ~ 12. He kūpono maikaʻi me ka starch, guar gum, etc. a me nā surfactants he nui. Ke piʻi ka mahana i ka mahana gelation, hiki ke ʻano o ka gelation.
(3) E hoʻololi koʻikoʻi ka hoʻololi o ka mahana i ka pae paʻa wai o ka methyl cellulose. ʻO ka maʻamau, ʻoi aku ka kiʻekiʻe o ka mahana, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai. Inā ʻoi aku ka mahana o ka mortar ma mua o 40 °C, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai o ka methyl cellulose, kahi e hoʻopilikia nui ai i ka hana o ka mortar.
(4) He hopena koʻikoʻi ka methyl cellulose i ka hana a me ka hoʻopili ʻana o ka mortar. ʻO ka "Adhesion" ma aneʻi e pili ana i ka hoʻopili ʻana ma waena o ka mea hoʻopili a ka mea hana a me ke pani o ka paia, ʻo ia hoʻi, ka pale ʻana o ka mortar. He nui ka adhesion, he nui ka pale ʻana o ka mortar, a ʻo ka ikaika e koi ʻia e ka poʻe hana i ka hoʻohana ʻana he nui nō hoʻi, a ʻo ka hana ʻana o ka mortar he ʻilihune. Aia ka methylcellulose adhesion ma kahi pae haʻahaʻa i nā huahana cellulose ether.
ʻO ka HPMC ka hydroxypropyl methyl cellulose, ʻo ia ka non-ionic cellulose i hui ʻia eter i hana ʻia mai ka pulupulu hoʻomaʻemaʻe ma hope o ka mālama ʻana i ka alkali, me ka hoʻohana ʻana i ka propylene oxide a me ka methyl chloride ma ke ʻano he etherifying agents, a ma o ke ʻano o nā hopena. ʻO ka nui o ka hoʻololi ʻana he 1.2 a 2.0. ʻOkoʻa kona mau waiwai ma muli o ka hapa o ka methoxyl content a me ka hydroxypropyl content.
(1) Hiki ke hoʻoheheʻe ʻia ka Hydroxypropyl methylcellulose i ka wai anuanu, akā 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 hoʻoheheʻe ʻana i ka wai anuanu ma mua o ka methyl cellulose.
(2) ʻO ka viscosity o ka hydroxypropyl methylcellulose e pili ana i ka nui o 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. Akā ʻoi aku ka liʻiliʻi o kona viscosity e ka wela kiʻekiʻe ma mua o ka methyl cellulose. Paʻa kona hopena ma ka waiho ʻana ma ka lumi wela.
(3) He kūpaʻa ka Hydroxypropyl methylcellulose i ka waika 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 wikiwiki i kona hoʻoheheʻe ʻana a hoʻonui i ka viscosity. ʻO ka Hydroxypropyl methylcellulose paʻa i nā paʻakai maʻamau, akā i ka wā i kiʻekiʻe ai ka paʻakai o ka wai paʻakai, piʻi ka viscosity o ka hydroxypropyl methylcellulose solution.
(4) Ka paʻa wai ohydroxypropyl methylcellulosepili i kona nui hoʻohui, viscosity, etc. ʻO ka nui o ka mālama ʻana i ka wai ma lalo o ka huina hoʻohui like ʻoi aku ka kiʻekiʻe ma mua o ka methyl cellulose.
(5) Hiki ke hoʻohui ʻia ka Hydroxypropyl methylcellulose me nā pūhui polymer hiki ke hoʻoheheʻe ʻia i ka wai e hana i kahi hopena me ka ʻaʻahu a me ka viscosity kiʻekiʻe. E like me ka waiʻona polyvinyl, starch ether, mea ʻai meaʻai, etc.
(6) ʻOi aku ka kiʻekiʻe o ka hoʻopili ʻana o ka hydroxypropyl methylcellulose i ke kūkulu ʻana i ka mortar ma mua o ka methylcellulose.
(7) He ʻoi aku ka maikaʻi o ke kūʻē ʻana o ka hydroxypropyl methylcellulose i nā enzyme ma mua o ka methylcellulose, a ʻoi aku ka haʻahaʻa o kona hopena enzymatic degradation ma mua o ka methylcellulose.
Ka manawa hoʻouna: Apr-28-2024