He aha ka ʻokoʻa ma waena o HPMC a me MC

ʻO MC ka methyl cellulose, i loaʻa ma ka mālama ʻana i ka pulupulu i hoʻomaʻemaʻe ʻia 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 kekahi mau hopena. Ma keʻano laulā, ʻo ke kekelē o ka pani ʻana he 1.6 ~ 2.0, a ʻokoʻa hoʻi ka solubility me nā kekelē like ʻole o ka pani ʻana. No ka non-ionic cellulose ether.

(1) ʻO ka paʻa ʻana o ka wai omethyl cellulosehilinaʻi ia i ka nui o ka hoʻohui ʻana, ka mānoanoa, ka maikaʻi o nā ʻāpana a me ka wikiwiki o ka hoʻoheheʻe ʻana. Ma keʻano laulā, inā nui ka nui o ka hoʻohui ʻana, liʻiliʻi ka maikaʻi, a nui ka mānoanoa, kiʻekiʻe ka wikiwiki o ka paʻa ʻana o ka wai. I waena o lākou, ʻo ka nui o ka hoʻohui ka mea nui loa i ka wikiwiki o ka paʻa ʻana o ka wai, a ʻaʻole kūlike ka pae o ka mānoanoa me ka pae o ka paʻa ʻana o ka wai. ʻO ka wikiwiki o ka hoʻoheheʻe ʻana e hilinaʻi nui ʻia ma ke ʻano o ka hoʻololi ʻana o ka ʻili o nā ʻāpana cellulose a me ka maikaʻi o nā ʻāpana. I waena o nā ethers cellulose i luna, ʻoi aku ka kiʻekiʻe o ka paʻa ʻana o ka wai o ka methyl cellulose a me ka hydroxypropyl methyl cellulose.

(2) Hiki ke hoʻoheheʻe ʻia ka Methylcellulose i ka wai anuanu, akā paʻakikī ke hoʻoheheʻe ʻia i ka wai wela, a paʻa loa kona hopena wai i ka pae o ka pH = 3 ~ 12. Loaʻa iā ia ka launa maikaʻi me ka starch, guar gum, a me nā mea ʻē aʻe a me nā surfactants he nui. Ke hiki ka mahana i ka mahana gelation, hana ʻia ka hanana o ka gelation.

(3) ʻO ka loli o ka mahana e hoʻopilikia nui i ka nui o ka paʻa ʻana o ka wai o ka methyl cellulose. Ma keʻano laulā, ʻo ke kiʻekiʻe o ka mahana, ʻoi aku ka ʻino o ka paʻa ʻana o ka wai. Inā ʻoi aku ka mahana o ka mortar ma mua o 40 °C, e ʻoi aku ka ʻino 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 ko ka Methyl cellulose i ka hana a me ka hoʻopili ʻana o ka mortar. ʻO ka "Adhesion" ma ʻaneʻi e pili ana i ka pipili i manaʻo ʻia ma waena o ka mea hana a ka mea hana a me ka substrate paia, ʻo ia hoʻi, ke kūpaʻa ʻoki o ka mortar. Nui ka pipili, nui ke kūpaʻa ʻoki o ka mortar, a nui nō hoʻi ka ikaika e pono ai nā limahana i ke kaʻina hana hoʻohana, a maikaʻi ʻole ke kūkulu ʻana o ka mortar. Aia ka pipili Methylcellulose ma kahi pae waena i nā huahana cellulose ether.

ʻO HPMC ka hydroxypropyl methyl cellulose, he ʻether hui ʻia me ka cellulose non-ionic i hana ʻia mai ka pulupulu i hoʻomaʻemaʻe ʻia 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 kekahi mau hopena. ʻO ke kekelē o ka hoʻololi ʻana he 1.2 a 2.0. ʻOkoʻa kona mau waiwai ma muli o ka hapa o ka ʻike methoxyl a me ka ʻike hydroxypropyl.

(1) He maʻalahi ka hoʻoheheʻe ʻana o ka Hydroxypropyl methylcellulose i ka wai anuanu, akā 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 hoʻoheheʻe ʻana i ka wai anuanu i hoʻohālikelike ʻia me ka methyl cellulose.

(2) Pili ka mānoanoa o ka hydroxypropyl methylcellulose i ka nui o kona kaumaha molekala, a ʻo ka nui o ke kaumaha molekala, ʻo ke kiʻekiʻe o ka mānoanoa. Hoʻopilikia pū ka mahana i kona mānoanoa, i ka piʻi ʻana o ka mahana, emi ka mānoanoa. Akā, ʻaʻole i hoʻopilikia nui ʻia kona mānoanoa e ka mahana kiʻekiʻe ma mua o ka methyl cellulose. Paʻa kona hopena ma ka mālama ʻana ma ka mahana o ka lumi.

(3) 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 hoʻoheheʻe ʻia a hoʻonui i ka 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.

(4) Ka paʻa ʻana o ka wai ohydroxypropyl methylcellulosehilinaʻi ia i kona nui i hoʻohui ʻia, ka mānoanoa, a pēlā aku. ʻOi aku ke kiʻekiʻe o ka nui o ka paʻa ʻana o ka wai ma lalo o ka nui hoʻohui like ma mua o ka methyl cellulose.

(5) Hiki ke hoʻohuihui ʻia ka Hydroxypropyl methylcellulose me nā hui polymer wai-hoʻoheheʻe ʻia e hana i kahi hopena me ka viscosity like a kiʻekiʻe. E like me ka polyvinyl alcohol, starch ether, vegetable gum, a pēlā aku.

(6) ʻOi aku ke kiʻekiʻe o ka hoʻopili ʻana o ka hydroxypropyl methylcellulose i ke kūkulu ʻana o ka mortar ma mua o ka methylcellulose.

(7) ʻOi aku ka maikaʻi o ke kūʻē ʻana o ka Hydroxypropyl methylcellulose i nā enzymes ma mua o ka methylcellulose, a ʻoi aku ka haʻahaʻa o ka hiki ke hoʻohaʻahaʻa ʻia ka hopena o ka enzymatic ma mua o ka methylcellulose.