Methyl Cellulose (MC) Molecular formula \[C6H7O2(OH)3-h(OCH3)n1] x Hoʻohana ʻia ka pulupulu i hoʻomaʻemaʻe ʻia me ka alkali, a hoʻohana ʻia ka methyl chloride ma ke ʻano he etherification agent. Ma hope o ke ʻano o nā hopena, lawe ʻia ka mālama cellulose ether. ʻO ka maʻamau, ʻo ka pae o ka hoʻololi ʻana he 1.6 ~ 2.0, a ʻokoʻa ke ʻano o ka hoʻololi. No ka non-ionic cellulose ether.
1. Hiki ke hoʻoheheʻe ʻia ka Methylcellulose i ka wai anuanu, e hālāwai ana ka wai wela i nā pilikia, a paʻa loa ka pae pH o ka hopena wai ma waena o 3/12. ʻO ka starch, ka guar gum a me nā mea ʻē aʻe he nui ke kūpono. Hana ʻia ka Gelation i ka wā e hiki ai ka mahana i ka mahana gelation.
ʻO ka paʻa ʻana o ka wai o ka methylcellulose e pili ana i kona nui i hoʻohui ʻia, viscosity, particle fineness and dissolution rate. Hoʻonui nui, liʻiliʻi, kiʻekiʻe viscosity, paʻa wai kiʻekiʻe. I waena o lākou, ʻo ka paʻa ʻana o ka wai ka hopena nui loa, a ʻaʻole kūlike ka pae viscosity i ka paʻa ʻana o ka 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 eter cellulose i luna, ʻo ka methyl cellulose a me ka hydroxypropyl methyl cellulose ka paʻa wai kiʻekiʻe.
Hiki i nā hoʻololi wela ke hoʻopilikia koʻikoʻi i ka paʻa ʻana o ka wai o ka methyl cellulose. - ʻO ke kiʻekiʻe o ka mahana, ʻoi aku ka maikaʻi o ka mālama ʻana i 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.
He hopena koʻikoʻi ka Methylcellulose i ka hana a me ka pili ʻana o ka mortar. ʻO ka "stickiness" ma aneʻi e pili ana i ka hoʻopili ʻana ma waena o ka mea hoʻopili a ka mea hana a me ka substrate o ka pā, ʻo ia hoʻi, ka pale ʻana o ka mortar. ʻO ka viscosity, ka ikaika ʻokiʻoki o ka pahū, a me ka ikaika e koi ʻia e nā limahana e hoʻohana nei he nui loa, a ʻaʻole maikaʻi ka hana ʻana i ka pahū. Hoʻopili ʻia ka Methylcellulose ma nā pae haʻahaʻa i nā huahana cellulose ether.
2. Hydroxypropyl methylcellulose (HPMC) [C 6 H 7 O 2 (OH) 3-mn (OCH 3 ) m, OCH 2 CH (OH) CH 3 ] n]] hydroxypropyl methyl cellulose I nā makahiki i hala iho nei, ua loaʻa nā ʻano cellulose. piʻi wikiwiki. He mea non-ionic cellulose i hui ʻia eter i hoʻomākaukau ʻia e kekahi mau hopena ma hope o ka alkalization o ka pulupulu alkali i hoʻomaʻemaʻe ʻia, kahi i hoʻohana ʻia ai ka propylene oxide a me ka methyl chloride e like me nā mea etherification. ʻO ka nui o ka hoʻololi ʻana he 1.2/2.0. ʻOkoʻa kona mau waiwai e like me ka ratio o ka methoxyl content a me ka hydroxypropyl content.
1. Hoʻokaʻawaleʻia ka Hydroxypropyl methylcellulose i keʻano wela-melt a me keʻano koke. ʻOi aku ka kiʻekiʻe o ka mahana gelation i ka wai wela ma mua o ka methylcellulose. Hōʻike pū ia i kahi hoʻomaikaʻi maikaʻi loa ma luna o ka methylcellulose ke hoʻoheheʻe ʻia i ka wai anuanu.
ʻO ka viscosity o ka hydroxypropyl methylcellulose e pili ana i ke kaumaha mole, a he kiʻekiʻe ke kaumaha mole. 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 ka mahana ma ka viscosity ma mua o ka methyl cellulose. He paʻa ka hoʻopaʻa ʻana ma ka lumi wela.
3. ʻO ka paʻa ʻana o ka wai o ka hydroxypropyl methylcellulose e pili ana i kona nui hoʻohui, viscosity, etc., a ʻoi aku ka kiʻekiʻe o ka paʻa wai o ka nui like ma mua o ka methyl cellulose.
4. He kūpaʻa ka Hydroxypropyl methylcellulose i ka waika a me ka alkali, a paʻa loa kona ʻano wai i ka pae pH o 2/12. ʻAʻole nui ka mana o ka hana ʻana o ka soda caustic a me ka wai lime, akā hiki i ka alkali ke hoʻolalelale i kona helu dissolution, a hoʻonui ʻia 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.
Hiki ke hoʻohui ʻia ka Hydroxypropyl methylcellulose me nā polymers hiki ke hoʻoheheʻe ʻia i ka wai e hana i kahi ʻano like ʻole, kiʻekiʻe-viscosity solution. E like me ka waiʻona polyvinyl, starch ether, mea ʻai meaʻai, etc.
ʻO ka hydroxypropyl methylcellulose ka ikaika o ka enzyme ma mua o ka methylcellulose, ʻoi aku ka haʻahaʻa o ka hoʻohaʻahaʻa enzymatic o kāna hopena ma mua o ka methylcellulose, a ʻoi aku ka kiʻekiʻe o ka hoʻopili ʻana o ka hydroxypropylmethylcellulose i ke kūkulu ʻana i ka mortar ma mua o ka methylcellulose. cellulose kumu.
ʻEkolu, hydroxyethyl cellulose (HEC) i hana ʻia mai ka pulupulu hoʻomaʻemaʻe ʻia me ka alkali, i mua o ka acetone, a me ka ethylene oxide ma ke ʻano he etherification agent. ʻO kona degere 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 ka hopena i ka wela kiʻekiʻe a ʻaʻohe waiwai gel. Hiki ke hoʻohana ʻia no ka manawa lōʻihi i ka mortar wela kiʻekiʻe, akā ʻoi aku ka haʻahaʻa o kona paʻa wai ma mua o ka methyl cellulose.
2. He kūpaʻa ka Hydroxyethyl cellulose i ka waikawa maʻamau a me ka alkali. Hoʻomaka ka alkali i kona hoʻoheheʻe ʻana, a piʻi iki kona viscosity. ʻOi aku ka ʻino o kona hoʻopuehu ʻana i ka wai ma mua o ka methyl cellulose a me ka hydroxypropyl methyl cellulose.
3. ʻO ka hydroxyethyl cellulose ka hana anti-hanging maikaʻi ma ka mortar, akā no ka manawa lōʻihi, ʻoi aku ka haʻahaʻa o ka hydroxyethyl cellulose i hana ʻia ma ka home ma mua o ka methyl cellulose ma muli o ka nui o ka wai a me ka nui o ka lehu.
4. ʻO Carboxymethyl cellulose (CMC) \ [C6H7O2 (OH) 2och2COONa] (ka pulupulu, a me nā mea'ē aʻe) o ka fiber maoli e mālamaʻia me ka alkali, a ua hoʻohanaʻia ka sodium chloroacetate e like me ka mea etherification agent, ma hope o keʻano o ka hopena o ka hopena, ua hanaʻia i ka ionic cellulose etera. ʻO ka nui o ka hoʻololi ʻana he 0.4/1.4, a ʻoi aku ka hopena o ke degere o ka hoʻololi ʻana i ka hana.
Loaʻa ka hygroscopicity kiʻekiʻe o Carboxymethyl cellulose, a ʻoi aku ka nui o ka wai i nā kūlana mālama maʻamau.
2. Carboxymethyl cellulose aqueous solution ʻaʻole ia e hoʻopuka i ka gel, emi ka viscosity i ka wā e piʻi ai ka mahana, a ʻaʻole hiki ke hoʻololi ʻia ka viscosity ke ʻoi aku ka mahana ma mua o 50 ° C.
Hoʻopilikia nui ʻia kona kūpaʻa e ka pH. Hoʻohana maʻamau no ka mortar gypsum, ʻaʻole no ka mortar sima. I ka hihia o ka alkalinity kiʻekiʻe, e nalowale kona viscosity.
ʻOi aku ka haʻahaʻa o kona paʻa wai ma mua o ka methyl cellulose. He hopena hoʻopaneʻe ko Gypsum mortar, hoʻemi i ka ikaika. Akā ʻoi aku ka haʻahaʻa o ka carboxymethyl cellulose ma mua o ka methyl cellulose.
Ka manawa hoʻouna: Jan-13-2023