He nīnau wikiwiki e pili ana i nā ethers cellulose

He hui like ʻole nā ​​​​​​mea kemika i loaʻa mai ka cellulose, ʻo ia ka polymer organik nui loa ma ka Honua. Ua loaʻa i kēia mau mea hoʻohui ka hoʻohana nui ʻia ma nā ʻoihana like ʻole ma muli o ko lākou mau waiwai kūikawā a me nā noi like ʻole.

ʻAno a me nā Waiwai oNā ʻEtera Cellulose
ʻO ka Cellulose, kahi polysaccharide i hana ʻia me nā ʻāpana glucose hou i hoʻopili ʻia e nā pilina glycosidic β(1→4), lawelawe ʻo ia ke ʻano hana mua i loko o nā paia cell o nā mea kanu. Hoʻohui ʻia nā cellulose ethers ma ka hoʻololi kemika ʻana i nā hui hydroxyl (-OH) i loko o ka mole cellulose. ʻO nā ʻano maʻamau o nā cellulose ethers e komo pū ana me ka methyl cellulose (MC), hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC), carboxymethyl cellulose (CMC), a me ka ethyl hydroxyethyl cellulose (EHEC).

ʻO ke pani ʻana o nā hui hydroxyl i loko o ka cellulose me nā hui hana like ʻole e hoʻololi i nā waiwai o nā ethers cellulose i loaʻa. No ka laʻana, ʻo ka hoʻokomo ʻana o nā hui methyl e hoʻonui i ka solubility wai a me nā waiwai hana kiʻiʻoniʻoni, e kūpono ai ʻo MC no nā noi i nā lāʻau lapaʻau, nā huahana meaʻai, a me nā mea kūkulu. Pēlā nō, ʻo ka hoʻohui ʻana o nā hui hydroxyethyl a i ʻole hydroxypropyl e hoʻomaikaʻi i ka paʻa ʻana o ka wai, ka hiki ke mānoanoa, a me ka hoʻopili ʻana, e hana ana iā HEC a me HPC i mau mea hoʻohui waiwai i nā huahana mālama pilikino, nā pena, a me nā mea hoʻopili. ʻO Carboxymethyl cellulose, i hana ʻia ma ke pani ʻana i nā hui hydroxyl me nā hui carboxymethyl, hōʻike i ka paʻa ʻana o ka wai, ke kūpaʻa, a me nā waiwai mānoanoa maikaʻi loa, e hoʻohana nui ʻia ana i ka ʻoihana meaʻai, nā lāʻau lapaʻau, a ma ke ʻano he mea hoʻohui wai wili i ka ʻāpana aila a me ke kinoea.

ʻO ke kekelē o ka pani ʻana (DS), e hōʻike ana i ka helu awelika o nā hui hydroxyl i pani ʻia no kēlā me kēia ʻāpana glucose i loko o ka cellulose, e hoʻopilikia nui i nā waiwai o nā ethers cellulose. ʻO nā waiwai DS kiʻekiʻe e hopena pinepine i ka hoʻonui ʻia o ka solubility, viscosity, a me ke kūpaʻa, akā ʻo ka pani nui ʻana e hoʻopilikia paha i ka biodegradability a me nā ʻano makemake ʻē aʻe o nā ethers cellulose.

Hana ʻana o nā Cellulose Ethers
ʻO ka hana ʻana o nā ethers cellulose e pili ana i nā hopena kemika e hoʻokomo i nā hui substituent ma luna o ke kuamoʻo cellulose. ʻO kekahi o nā ʻano hana maʻamau no ka hana ʻana i nā ethers cellulose ʻo ia ka etherification o ka cellulose me ka hoʻohana ʻana i nā reagents kūpono ma lalo o nā kūlana i kāohi ʻia.

No ka laʻana, ʻo ka hana ʻana o ka methyl cellulose e pili ana i ka hopena o ka cellulose me nā hydroxides metala alkali e hana i ka cellulose alkali, a ukali ʻia e ka mālama ʻana me ka methyl chloride a i ʻole dimethyl sulfate e hoʻolauna i nā hui methyl ma luna o ke kaulahao cellulose. Pēlā nō, ua hana ʻia ka hydroxypropyl cellulose a me ka hydroxyethyl cellulose ma ka hana ʻana i ka cellulose me ka propylene oxide a i ʻole ethylene oxide, ma ke alo o nā mea hoʻoulu alkali.

Hoʻopuka ʻia ka Carboxymethyl cellulose ma o ka hopena o ka cellulose me ka sodium hydroxide a me ka chloroacetic acid a i ʻole kona paʻakai sodium. Hana ʻia ke kaʻina hana carboxymethylation ma o ka nucleophilic substitution, kahi e hana ai ka hui hydroxyl o ka cellulose me ka chloroacetic acid e hana i kahi carboxymethyl ether linkage.

Pono ka hana ʻana o nā cellulose ethers i ka kaohi pono ʻana i nā kūlana hopena, e like me ka mahana, pH, a me ka manawa hopena, e hoʻokō ai i ke kiʻekiʻe o ka hoʻololi a me nā waiwai huahana i makemake ʻia. Eia kekahi, hoʻohana pinepine ʻia nā ʻanuʻu hoʻomaʻemaʻe e wehe i nā huahana a me nā haumia, e hōʻoiaʻiʻo ana i ka maikaʻi a me ke kūlike o nā cellulose ethers.

Nā noi o nā Cellulose Ethers
Loaʻa nā noi ākea o nā cellulose ethers ma nā ʻoihana like ʻole ma muli o ko lākou mau waiwai like ʻole a me nā hana. ʻO kekahi o nā noi koʻikoʻi:

ʻOihana Meaʻai:Nā ʻetera celluloseʻO nā mea e like me ka carboxymethyl cellulose e hoʻohana pinepine ʻia ma ke ʻano he mau mea hoʻomānoanoa, nā mea hoʻopaʻa, a me nā emulsifiers i nā huahana meaʻai e like me nā mea ʻono, nā mea ʻono, a me nā ice cream. Hoʻomaikaʻi lākou i ke ʻano, ka mānoanoa, a me ke kūpaʻa o ka papa me ka hoʻomaikaʻi ʻana i ka ʻono o ka waha a me ka hoʻokuʻu ʻana i ka ʻono.

Nā lāʻau lapaʻau: Hoʻohana nui ʻia ka Methyl cellulose a me ka hydroxypropyl cellulose i nā ʻano lāʻau lapaʻau e like me nā mea hoʻopaʻa, nā mea hoʻoheheʻe, a me nā mea hoʻokuʻu i kāohi ʻia i loko o nā papa, nā capsules, a me nā ʻano topical. Hoʻomaikaʻi kēia mau cellulose ethers i ka lawe ʻana i ka lāʻau, ka bioavailability, a me ka hoʻokō ʻana o ka mea maʻi.

Nā Mea Hana Kūkulu: Hoʻohana ʻia ka Methyl cellulose a me ka hydroxyethyl cellulose i ka ʻoihana kūkulu hale ma ke ʻano he mea hoʻohui i nā mortars sima, nā plasters, a me nā mea hoʻopili tile e hoʻomaikaʻi i ka hana, ka paʻa ʻana o ka wai, a me nā waiwai hoʻopili. Hoʻomaikaʻi lākou i ka pili ʻana, hoʻēmi i ka nahā ʻana, a hoʻomaikaʻi i ka hana o nā mea kūkulu hale.

Nā Huahana Mālama Pilikino: ʻO ka Hydroxyethyl cellulose a me ka hydroxypropyl cellulose nā mea maʻamau i nā huahana mālama pilikino e like me nā shampoos, lotions, a me nā kirīmi ma muli o t

o ko lākou mau waiwai mānoanoa, hoʻopaʻa, a me ke ʻano hana kiʻiʻoniʻoni. Hoʻomaikaʻi lākou i ke kūlike o ka huahana, ke ʻano, a me ka ʻili me ka hoʻoikaika ʻana i ke kūpaʻa o ka hoʻohuihui ʻana.

Nā Pena a me nā Uhi: Hana nā ethers cellulose ma ke ʻano he mea hoʻololi rheology, nā mea hoʻomānoanoa, a me nā mea hoʻopaʻa i nā pena, nā uhi, a me nā mea hoʻopili, e hoʻomaikaʻi ana i nā waiwai noi, ke ʻano kahe, a me ka hoʻokumu ʻana i ka kiʻiʻoniʻoni. Hoʻonui lākou i ka kaohi viscosity, ke kū'ē ʻana i ka sag, a me ke kūpaʻa o ke kala i nā ʻano wai.

ʻOihana ʻAila a me ke Kinoea: Hoʻohana ʻia ka Carboxymethyl cellulose ma ke ʻano he mea hoʻololi viscosity a me ka mea hoʻomalu i ka nalowale o ka wai i nā wai ʻeli no ka ʻimi ʻana a me ka hana ʻana i ka ʻaila a me ke kinoea. Hoʻomaikaʻi ia i ka rheology wai, ka hoʻomaʻemaʻe ʻana i nā lua, a me ke kūpaʻa o ka luawai me ka pale ʻana i ka hōʻino ʻana o ke ʻano.

ʻOihana lole: Hoʻohana ʻia nā ethers cellulose i ka paʻi ʻana i ka lole, ka hoʻoluʻu ʻana, a me nā kaʻina hana hoʻopau e hoʻomaikaʻi i ka wehewehe ʻana o ka paʻi, ka hua kala, a me ka palupalu o ka lole. Hoʻomaʻamaʻa lākou i ka hoʻolaha ʻana o ka pigment, ka hoʻopili ʻana i nā olonā, a me ka paʻa o ka holoi ʻana i nā noi lole.

Nā ʻetera cellulosehōʻike i kahi hui like ʻole o nā hui kemika i loaʻa mai ka cellulose, e hāʻawi ana i kahi ākea o nā waiwai a me nā hana no nā noi ʻoihana like ʻole. Ma o nā hoʻololi kemika i kāohi ʻia o ke kuamoʻo cellulose, hōʻike nā cellulose ethers i nā ʻano makemake e like me ka solubility wai, kaohi viscosity, a me ke kūpaʻa, e hoʻolilo iā lākou i mau mea hoʻohui waiwai nui i nā ʻoihana mai ka meaʻai a me nā lāʻau lapaʻau a hiki i ke kūkulu ʻana a me nā lole. Ke hoʻomau nei ka ulu ʻana o ke koi no nā mea hoʻomau a me nā mea aloha i ke kaiapuni, ua mākaukau nā cellulose ethers e pāʻani i kahi kuleana koʻikoʻi i ka hoʻokō ʻana i nā pono e ulu nei o nā ʻoihana hou me ka hoʻemi ʻana i ka hopena o ke kaiapuni.