ʻO MC ka methyl cellulose, ka mea i hana ʻia me ka cellulose ether ma o ka mālama ʻana i ka pulupulu i hoʻomaʻemaʻe ʻia me ka alkali, me ka hoʻohana ʻana i ka methane chloride ma ke ʻano he etherification agent, a e hele ana i nā ʻano 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) ʻO ka paʻa ʻana o ka wai o ka methyl cellulose e pili ana i kona nui hoʻohui, viscosity, ʻoi aku ka maikaʻi a me ka helu dissolution. ʻO ka maʻamau, inā nui ka hoʻohui, liʻiliʻi ka fineness, a nui ka viscosity, kiʻekiʻe ka nui o ka paʻa ʻana o ka wai. I waena o lākou, ʻo ka nui o ka hoʻohui i ka hopena nui loa i ka nui o ka mālama ʻana i ka wai, a ʻaʻole kūlike ka pae o ka viscosity i ke kiʻekiʻe o ka 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 fineness. 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, a paʻakikī ke hoʻoheheʻe i ka wai wela. Paʻa loa kona hopena wai i ka pae o 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, puka ka gelation.
(3) Hoʻololi koʻikoʻi ka hoʻololi ʻana i ka mahana i ka nui o ka mālama ʻana i ka 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, e hoʻemi nui ʻia ka paʻa ʻana o ka wai o ka methyl cellulose, e hoʻopilikia nui i ke kūkulu ʻana i ka mortar.
(4) He hopena koʻikoʻi ka methyl cellulose i ke kūkulu ʻana a me ka hoʻopili ʻana o ka mortar. ʻO ka "adhesion" ma aneʻi e pili ana i ka ikaika pipili i manaʻo ʻia ma waena o ka mea hoʻopili a ka mea hana a me ke pani o ka pā, ʻo ia hoʻi, ka pale ʻana o ka mortar. He kiʻekiʻe ka adhesiveness, he nui ka pale ʻana o ka mortar, a ʻo ka ikaika i koi ʻia e ka poʻe hana i ka hana o ka hoʻohana ʻana he nui nō hoʻi, a ʻo ka hana ʻana o ka mortar he ʻilihune. Aia ka methyl cellulose adhesion ma kahi pae haʻahaʻa i nā huahana cellulose ether.
ʻO ka HPMC ka hydroxypropyl methylcellulose, ʻo ia ka non-ionic cellulose 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 agents, a 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 nā ratio like ʻole o ka methoxyl content a me 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) 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 nō naʻe, ʻoi aku ka haʻahaʻa o kona viscosity kiʻekiʻe ma mua o ka methyl cellulose. Paʻa kona hopena ke mālama ʻia 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. He 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 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.
(4) 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 wai ma lalo o ka nui hoʻohui like 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 ʻano like ʻole a ʻoi aku ka viscosity solution. 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 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.
Ka manawa hoʻouna: Apr-17-2023