ʻO ka Methylcellulose (MC) a me ka carboxymethylcellulose (CMC) ʻelua mau ʻāpana cellulose maʻamau, hoʻohana nui ʻia i ka meaʻai, lāʻau lapaʻau, kūkulu hale, ʻoihana kemika a me nā ʻoihana ʻē aʻe. ʻOiai ua hoʻololi ʻia lākou a pau mai ka cellulose maoli, aia nā ʻokoʻa nui i ka hoʻolālā kemika, nā waiwai kino a me nā mea kemika, a me nā noi.
1. Hoʻolālā kemika a me ka hana hoʻomākaukau
Hoʻopuka ʻia ka Methylcellulose ma ka hana ʻana i ka cellulose me ka methyl chloride (a i ʻole methanol) ma lalo o nā kūlana alkaline. I loko o kēia kaʻina hana, ua hoʻololi ʻia kahi hapa o nā pūʻulu hydroxyl (-OH) i loko o nā molekole cellulose e nā hui methoxy (-OCH₃) e hana i ka methylcellulose. ʻO ke kiʻekiʻe o ka hoʻololi ʻana (DS, ka helu o nā mea pani i kēlā me kēia ʻāpana glucose) o ka methylcellulose e hoʻoholo ai i kona ʻano kino a me ke kemika, e like me ka solubility a me ka viscosity.
Hoʻopuka ʻia ka Carboxymethylcellulose ma ka hana ʻana i ka cellulose me ka waikawa chloroacetic ma lalo o nā kūlana alkaline, a ua pani ʻia ka hui hydroxyl e ka carboxymethyl (-CH₂COOH). ʻO ka degere o ka hoʻololi ʻana a me ka degere o ka polymerization (DP) o CMC e pili ana i kona solubility a me ka viscosity i ka wai. Loaʻa ka CMC ma ke ʻano o ka paʻakai sodium, i kapa ʻia ʻo sodium carboxymethylcellulose (NaCMC).
2. Ka waiwai kino a me ke kemika
Solubility: Hoʻoheheʻe ʻia ka Methylcellulose i ka wai anuanu, akā nalowale ka solubility a hana i ka gel i ka wai wela. Hiki i kēia hoʻololi wela ke hoʻohana i ka mānoanoa a me ka gelling agent i ka hana ʻai. Hiki ke hoʻoheheʻe ʻia ka CMC i ka wai anuanu a me ka wai wela, akā e emi ana ka viscosity o kāna hoʻonā i ka piʻi ʻana o ka mahana.
Viscosity: Hoʻopili ʻia ka viscosity o nā mea ʻelua e ke kiʻekiʻe o ka hoʻololi a me ka neʻe ʻana o ka hopena. Piʻi mua ka viscosity o MC a laila emi iho i ka piʻi ʻana o ka mahana, ʻoiai ke emi nei ka viscosity o CMC i ka piʻi ʻana o ka mahana. Hāʻawi kēia iā lākou i kā lākou pono ponoʻī i nā noi ʻoihana like ʻole.
Paʻa pH: Paʻa mau ʻo CMC ma kahi ākea pH ākea, ʻoi aku ma lalo o nā kūlana alkaline, e kaulana loa ia ma ke ʻano he stabilizer a mānoanoa i nā meaʻai a me nā lāʻau lapaʻau. Paʻa ka MC ma lalo o nā kūlana kūʻokoʻa a me nā kūlana alkaline, akā e hoʻohaʻahaʻa ʻia i loko o nā waikawa ikaika a i ʻole nā alkali.
3. Nā wahi noi
ʻOihana meaʻai: Hoʻohana mau ʻia ka Methylcellulose i ka meaʻai ma ke ʻano he mānoanoa, emulsifier a me ka stabilizer. No ka laʻana, hiki iā ia ke hoʻohālike i ka ʻono a me ke ʻano o ka momona i ka wā e hana ai i nā meaʻai haʻahaʻa momona. Hoʻohana nui ʻia ʻo Carboxymethylcellulose i nā mea inu, nā mea i hoʻomoʻa ʻia a me nā huahana waiu e like me ka mānoanoa a me ka stabilizer e pale ai i ka hoʻokaʻawale wai a hoʻomaikaʻi i ka ʻono.
ʻOihana lāʻau lapaʻau: Hoʻohana ʻia ʻo Methylcellulose i ka hoʻomākaukau ʻana i nā papa lāʻau lapaʻau ma ke ʻano he mea hoʻopaʻa a me ka disintegrant, a me ka lubricant a me ka mea pale, e like me ka ophthalmic eye drops ma ke ʻano he waimaka. Hoʻohana nui ʻia ʻo CMC i ka lāʻau lapaʻau ma muli o kona biocompatibility maikaʻi, e like me ka hoʻomākaukau ʻana i nā lāʻau hoʻokuʻu hoʻomau a me nā mea hoʻopili i nā kulu maka.
ʻO ke kūkulu hale a me ka ʻoihana kemika: Hoʻohana nui ʻia ʻo MC i nā mea kūkulu hale e like me ka mānoanoa, ka mea mālama wai a me ka mea hoʻopili no ka sima a me ka gypsum. Hiki iā ia ke hoʻomaikaʻi i ka hana hana a me ka maikaʻi o ka ʻili o nā mea. Hoʻohana pinepine ʻia ʻo CMC i ka mālama ʻana i ka lepo i ka ʻeli ʻana o ka aila, slurry i ka paʻi textile a me ka dyeing, ka uhi ʻana o ka pepa, etc.
4. Ka palekana a me ka palekana kaiapuni
Manaʻo ʻia nā mea ʻelua i palekana no ka hoʻohana ʻana i nā noi meaʻai a me nā lāʻau lapaʻau, akā ʻokoʻa nā hopena o kā lākou kumu a me nā kaʻina hana i ke kaiapuni. Loaʻa nā mea maka o MC a me CMC mai ka cellulose kūlohelohe a he biodegradable, no laila ke hana maikaʻi nei lākou ma ke ʻano o ke aloha kaiapuni. Eia nō naʻe, hiki i kā lākou hana hana ke komo i nā mea hoʻoheheʻe kemika a me nā reagents, e loaʻa paha kekahi hopena i ke kaiapuni.
5. ʻO ke kumu kūʻai a me ka makemake o ka mākeke
Ma muli o nā kaʻina hana like ʻole, ʻoi aku ka kiʻekiʻe o ke kumukūʻai o ka methylcellulose, no laila ʻoi aku ka kiʻekiʻe o kāna kumukūʻai ma mua o ka carboxymethylcellulose. ʻOi aku ka nui o ka makemake o ka mākeke ma CMC ma muli o kāna noi ākea a me nā kumukūʻai hana haʻahaʻa.
ʻOiai ʻo ka methylcellulose a me ka carboxymethylcellulose nā derivatives ʻelua o ka cellulose, loaʻa iā lākou nā ʻokoʻa nui i ka hoʻolālā, nā waiwai, nā noi a me nā koi mākeke. Hoʻohana nui ʻia ʻo Methylcellulose i nā ʻano meaʻai, lāʻau lapaʻau a me nā mea kūkulu hale ma muli o kona hoʻololi ʻana i ka wela a me ka mana viscosity kiʻekiʻe. Ua hoʻohana nui ʻia ʻo Carboxymethyl cellulose i ka meaʻai, lāʻau lapaʻau, petrochemical, textile a me nā ʻoihana ʻē aʻe ma muli o kona solubility maikaʻi loa, hoʻoponopono viscosity a me ka adaptability pH ākea. ʻO ke koho ʻana o ka cellulose derivative e pili ana i ke ʻano o ka noi kikoʻī a me nā pono.
Ka manawa hoʻouna: ʻAukake-20-2024