He aha ka ʻokoʻa ma waena o HPMC a me MC?

A:

ʻO MC ka methyl cellulose: he pulupulu hoʻomaʻemaʻe ma hope o ka mālama ʻana i ka alkali, methane chloride ma ke ʻano he etherifying agent, ma o ke ʻano o nā hopena e hana ai i ka cellulose ether. ʻO ka maʻamau, ʻo ke degere o ka hoʻololi ʻana he 1.6 ~ 2.0, a ʻokoʻa ka solubility me ke ʻano o ka hoʻololi. Nonionic 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. Hoʻohui maʻamau i ka nui, liʻiliʻi liʻiliʻi, viscosity, kiʻekiʻe ka paʻa wai. He hopena nui ka nui o nā mea hoʻohui i ka nui o ka paʻa ʻana o ka wai, a ʻaʻole kūlike ka viscosity i ka pae paʻa wai. ʻO ka nui o ka hoʻoheheʻe ʻana e hilinaʻi nui ʻia i ka pae hoʻololi o ka ʻili a me ka maikaʻi o nā ʻāpana cellulose. I loko o kekahi mau cellulose ethers i luna, ʻoi aku ka kiʻekiʻe o ka methyl cellulose a me HPMC hydroxypropyl methyl cellulose paʻa wai.

(2) Hiki ke hoʻoheheʻe ʻia ka methyl cellulose i ka wai anuanu, he paʻakikī ke hoʻoheheʻe i ka wai wela. Paʻa loa kona hopena wai i loko o ka pH = 3 ~ 12. He kūpono maikaʻi me ka starch, guanidine gum a me nā mea hoʻoheheʻe he nui. Hana ʻia ka Gelation i ka wā e hiki ai ka mahana i ka mahana 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 ℃, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai o ka methyl cellulose, kahi e hoʻopilikia nui ai i ka hana ʻana o ka mortar.

(4) Loaʻa ka mana o 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 adhesion i manaʻo ʻia e ka mea hana ma waena o ka mea paahana a me ke pani o ka pā, ʻo ia hoʻi ka pale ʻana o ka mortar. Nui ka hoʻopili ʻana, nui ka pale ʻana o ka mortar, ʻo ka ikaika i koi ʻia e nā limahana i ka hana o ka hoʻohana ʻana he nui nō hoʻi, a ʻo ka hana ʻana o ka mortar he ʻilihune. I nā huahana cellulose ether, aia ka hoʻopili ʻana o ka methyl cellulose ma kahi pae haʻahaʻa.

ʻO ka HPMC ka hydroxypropyl methyl cellulose: hana ʻia me ka pulupulu hoʻomaʻemaʻe ma hope o ka mālama ʻana i ka alkali, me ka propylene oxide a me ka chloromethane ma ke ʻano he etherifying agent, ma o ke ʻano o nā hopena a hana ʻia me ka non-ionic cellulose i hui ʻia eter. ʻO ka pae o ka hoʻololi ʻana he 1.2-2.0. ʻOkoʻa kona mau waiwai me ka hapa o ka methoxy a me ka hydroxypropyl content.

(1) Hiki ke hoʻoheheʻe ʻia ka HPMC hydroxypropyl methyl cellulose i ka wai anuanu, he paʻakikī ke hoʻoheheʻe i ka wai wela. Eia nō naʻe, ʻoi aku ka kiʻekiʻe o ka mahana gelation i ka wai wela ma mua o ka methyl cellulose. Ua hoʻomaikaʻi maikaʻi ʻia ka solubility o ka methyl cellulose i ka wai anuanu.

(2) ʻO ka viscosity o ka HPMC hydroxypropyl methyl cellulose e pili ana i kona kaumaha mole, a ʻoi aku ka kiʻekiʻe o ke kaumaha mole, ʻoi aku ka kiʻekiʻe o ka viscosity. Hoʻopili ka mahana i ka viscosity. E emi ana ka viscosity ke piʻi ka mahana. Akā ʻoi aku ka haʻahaʻa o kona hopena wela kiʻekiʻe ma mua o ka methyl cellulose. Paʻa ka hopena ke mālama ʻia ma ka lumi wela.

(3) HPMC hydroxypropyl methyl cellulose paʻa i ka waika a me ka base, a ʻo kona ʻano wai e paʻa loa i ka pae o ka pH = 2 ~ 12. He liʻiliʻi ka hopena o ka soda a me ka wai lime i kona mau waiwai, akā hiki i ka alkali ke hoʻolalelale i kona helu hoʻoheheʻe a hoʻomaikaʻi i ka viscosity. He kūpaʻa ka HPMC hydroxypropyl methyl cellulose i nā paʻakai maʻamau, akā ke kiʻekiʻe ka neʻe ʻana o ka hopena paʻakai, piʻi ka viscosity o ka HPMC hydroxypropyl methyl cellulose solution.

(4) ʻO ka paʻa ʻana o ka wai o ka HPMC hydroxypropyl methyl cellulose e pili ana i kāna ʻano a me ka viscosity, a ʻoi aku ka kiʻekiʻe o ka paʻa wai o ka HPMC hydroxypropyl methyl cellulose ma mua o ka methyl cellulose ma ke ʻano like.

(5) Hiki ke hoʻohui ʻia ka HPMC hydroxypropyl methyl cellulose me nā pūhui polymer hiki ke hoʻoheheʻe ʻia i ka wai e lilo i mea like, ʻoi aku ka nui o ka viscosity solution. E like me ka waiʻona polyvinyl, starch ether, ke kāpili mea kanu a pēlā aku.

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

(7) HPMC hydroxypropyl methyl cellulose he ʻoi aku ka maikaʻi o ke kūpaʻa enzyme ma mua o ka methyl cellulose, a ʻoi aku ka haʻahaʻa o kāna hopena enzyme degradation ma mua o ka methyl cellulose.