ʻO nā cellulose ethers nā ʻano polymers hiki ke hoʻoheheʻe ʻia i ka wai i loaʻa mai ka cellulose, kahi polymer kūlohelohe i loaʻa i loko o nā pā hale kanu.Loaʻa i kēia mau ethers nā waiwai like ʻole e like me ka mānoanoa, stabilization, film-forming, a me ka mālama ʻana i ka wai, a hoʻohana nui ʻia i nā ʻoihana like ʻole e like me ka lāʻau lapaʻau, ka meaʻai, nā mea hoʻonaninani, a me ke kūkulu ʻana.Ma waena o nā cellulose ethers, hydroxyethyl cellulose (HEC) a me ka hydroxypropyl methylcellulose (HPMC) ʻelua mau mea waiwai nui, kēlā me kēia me nā waiwai like ʻole a me nā noi.
1. Hoʻomaka i ka cellulose ethers
A. Hoʻokumu ʻia ʻo Cellulose a me nā mea i loaʻa
Ka ʻike o ka cellulose:
ʻO ka Cellulose kahi polymer linear i haku ʻia me nā ʻāpana glucose i hoʻopili ʻia e nā paʻa β-1,4-glycosidic.
He waiwai ia i nā pā hale mea kanu a hāʻawi i ke kākoʻo hoʻolālā a me ka paʻakikī i nā ʻiʻo mea kanu.
Nā mea i loaʻa iā Cellulose ether:
Loaʻa ka cellulose ethers mai ka cellulose ma o ka hoʻololi kemika.
Hoʻokomo ʻia nā Ethers e hoʻonui i ka solubility a hoʻololi i nā waiwai hana.
2. Hydroxyethylcellulose (HEC)
A. Kapili a me ka hui
Hoʻolālā kemika:
Loaʻa ka HEC ma ka etherification o cellulose me ka ethylene oxide.
Hoʻololi nā pūʻulu hydroxyethyl i nā pūʻulu hydroxyl i loko o ka hale cellulose.
Degere o ka pani ʻana (DS):
Hōʻike ʻo DS i ka helu awelika o nā pūʻulu hydroxyethyl i kēlā me kēia ʻāpana anhydroglucose.
Hoʻopili ia i ka solubility, viscosity a me nā waiwai ʻē aʻe o HEC.
B. Naauao
Hiki ke hoʻoheheʻe:
Hiki ke hoʻoheheʻe ʻia ka HEC i ka wai anuanu a me ka wai wela, e hāʻawi ana i ka maʻalahi o ka noi.
viscosity:
Ma ke ʻano he rheology modifier, pili ia i ka mānoanoa a me ke kahe o ka hopena.
ʻOkoʻa me DS, ka ʻike a me ka mahana.
Hoʻokumu kiʻiʻoniʻoni:
Hoʻokumu i kahi kiʻi ʻoniʻoni me ka hoʻopili maikaʻi.
C. Noi
lāʻau lapaʻau:
Hoʻohana ʻia ma ke ʻano he mānoanoa i nā ʻano wai.
Hoʻonui i ka viscosity a me ka paʻa o nā kulu maka.
Nā pena a me nā pena:
Hoʻonui i ka viscosity a hāʻawi i nā waiwai mānoanoa maikaʻi loa.
E hoʻomaikaʻi i ka hoʻopili ʻana i ka pena a me ka paʻa.
Nā huahana mālama pilikino:
Loaʻa i nā shampoos, creams a me nā lotions ma ke ʻano he mānoanoa a me ka stabilizer.
Hāʻawi i kahi ʻano maʻalahi i nā mea hoʻonaninani.
3. Hydroxypropylmethylcellulose (HPMC)
A. Kapili a me ka hui
Hoʻolālā kemika:
Hoʻopili ʻia ʻo HPMC ma ka hoʻololi ʻana i nā pūʻulu hydroxyl me nā pūʻulu methoxy a me hydroxypropyl.
Hana ʻia ka etherification ma ka pane ʻana me ka propylene oxide a me ka methyl chloride.
Methoxy a me ka hydroxypropyl pani:
Hāʻawi ka hui methoxy i ka solubility, aʻo ka hui hydroxypropyl e pili ana i ka viscosity.
B. Naauao
ʻO ka wai wela:
Hōʻike i ka reversible thermal gelation, hana i nā gels i nā wela kiʻekiʻe.
Hiki ke hoʻohana ʻia no nā hoʻomākaukau lāʻau lapaʻau hoʻokuʻu ʻia.
Paʻa wai:
ʻOi aku ka maikaʻi o ka mālama ʻana i ka wai, kūpono ia no nā hana kūkulu.
Hana i luna:
Hōʻike i nā waiwai e like me ka surfactant e kōkua i ka hoʻopaʻa ʻana i nā emulsion.
C. Noi
ʻOihana kūkulu hale:
Hoʻohana ʻia ma ke ʻano he mea hoʻopaʻa wai i ka mortar sima.
Hoʻomaikaʻi i ka hana a me ka hoʻopili ʻana o nā tile adhesives.
lāʻau lapaʻau:
Hoʻohana maʻamau i ka hoʻomākaukau lāʻau waha a me ka lāʻau topical.
Hoʻomaʻamaʻa i ka hoʻokuʻu ʻana i ka lāʻau ma muli o kona hiki ke hana gel.
ʻoihana meaʻai:
He mea mānoanoa a hoʻopaʻa i nā meaʻai.
Hāʻawi i ka hoʻomaikaʻi ʻana i ke ʻano a me ka waha i kekahi mau noi.
4. Hoʻohālikelike hoʻohālikelike
H. Nā ʻokoʻa o ka hui ʻana
HEC a me HPMC synthesis:
Hana ʻia ʻo HEC ma ka hoʻopili ʻana i ka cellulose me ka ethylene oxide.
Hoʻopili ʻia ka HPMC synthesis i ka hoʻololi pālua o nā pūʻulu methoxy a me hydroxypropyl.
B. Nā ʻokoʻa hana
Solubility a me Viscosity:
Hiki ke hoʻoheheʻe ʻia ka HEC i ka wai anuanu a me ka wai wela, aʻo ka solubility o HPMC e hoʻopili ʻia e ka ʻike o ka hui methoxy.
Hōʻike maʻamau ʻo HEC i ka viscosity haʻahaʻa i hoʻohālikelike ʻia me HPMC.
ʻO ka hana gel:
ʻAʻole like me ka HPMC, ka mea i hana i nā gels reversible, ʻaʻole i loaʻa ka HEC i ka gelation thermal.
C. Nā ʻokoʻa o ka hoʻohana ʻana
Paʻa wai:
Makemake ʻia ʻo HPMC no nā noi kūkulu hale ma muli o kāna mau waiwai mālama wai maikaʻi.
Hiki ke hana kiʻiʻoniʻoni:
Hoʻokumu ʻo HEC i nā kiʻiʻoniʻoni maʻemaʻe me ka hoʻopili maikaʻi ʻana, kūpono ia no kekahi mau noi kahi e koʻikoʻi ai ke kūkulu ʻana i ke kiʻiʻoniʻoni.
5 Ka hopena
I ka hōʻuluʻulu ʻana, ʻo ka hydroxyethyl cellulose (HEC) a me ka hydroxypropyl methylcellulose (HPMC) he mau cellulose ethers koʻikoʻi me nā waiwai kūikawā a me nā noi.ʻO kā lākou mau hana kemika kū hoʻokahi, nā ʻano o ka synthesis, a me nā waiwai hana e hoʻolilo iā lākou i mea maʻalahi i nā ʻoihana like ʻole.ʻO ka hoʻomaopopo ʻana i nā ʻokoʻa ma waena o HEC a me HPMC hiki ke kōkua iā ʻoe e hoʻoholo i ka ʻike i ke koho ʻana i ka cellulose ether kūpono no kahi noi kikoʻī, inā i loko o nā lāʻau lapaʻau, kūkulu hale, pena a i ʻole nā huahana mālama pilikino.Ke holomua nei ka ʻenehana me ka ʻepekema, hiki i ka noiʻi hou ke hōʻike i nā noi a me nā hoʻololi hou aʻe, a laila e hoʻonui ai i ka pono o kēia mau cellulose ethers ma nā ʻano like ʻole.
Ka manawa hoʻouna: Dec-11-2023