E nānā i ka Cellulose ethers

He aha ka ʻokoʻa ma waena o Hydroxyethyl cellulose (HEC) a me Hydroxypropyl cellulose (HPC)?

ʻO ka Hydroxyethyl cellulose (HEC) a me ka hydroxypropyl cellulose (HPC) ʻelua mau mea hoʻohana maʻamau i hoʻohana nui ʻia i nā ʻoihana ʻoihana he nui, e like me ka lāʻau lapaʻau, nā mea hoʻonaninani, nā meaʻai, a me nā mea kūkulu hale. ʻOiai ua like ko lākou mau ʻano kemika a ua hoʻokumu ʻia ma ka hoʻokomo ʻana i nā mea pani i nā molekole cellulose, he ʻokoʻa ko lākou i nā waiwai kemika, nā waiwai kino, a me nā kahua noi.

1. Nā ʻokoʻa o ka hana kemika

Hoʻokumu ʻia ka Hydroxyethyl cellulose (HEC) ma ka hoʻokomo ʻana i kahi hui hydroxyethyl (-CH₂CH₂OH) i loko o ke apo glucose o ka molekule cellulose. Loaʻa i kāna ʻano kemika ka nui o nā hydroxyethyl substituents, kahi e loaʻa ai ka HEC i ka wai solubility maikaʻi a me nā waiwai mānoanoa.

Hoʻokomo ka Hydroxypropyl cellulose (HPC) i kahi pūʻulu hydroxypropyl (-CH₂CHOHCH₃) i loko o ka mole cellulose. Ma muli o ka loaʻa ʻana o kēia pūʻulu hydroxypropyl, hōʻike ka HPC i kekahi mau hiʻohiʻona ʻokoʻa me HEC. No ka laʻana, loaʻa iā ia kahi degere o ka hydrophobicity, e hoʻoheheʻe ʻia i kekahi mau mea hoʻoheheʻe organik, e like me ka ethanol, isopropyl alcohol, etc.

2. ʻokoʻa solubility

ʻO kekahi o nā hiʻohiʻona nui o HEC ʻo ia ka hoʻoheheʻe wai maikaʻi, ʻoi aku ka nui o ka wai anuanu. Ma muli o ka hoʻokomo ʻana o nā pūʻulu hydroxyethyl, hiki i ka HEC ke hana i nā paʻa hydrogen me nā molekole wai i ka wā e hoʻoheheʻe ʻia ai, a laila e hoʻopuehu koke a hemo. No laila, he nui nā noi o ka HEC i nā ʻōnaehana wai, e like me ka uhi ʻana i ka wai, nā adhesives, detergents, etc.

He paʻakikī ka solubility o HPC. Hoʻopili nui ʻia ka solubility o ka HPC i ka wai e ka mahana. Hiki ke hoʻoheheʻe maikaʻi ʻia ma nā mahana haʻahaʻa, akā hiki ke hele mai ka gelation a i ʻole ka ua i nā wela kiʻekiʻe. Ma ka manawa like, loaʻa ka HPC i ka solubility i nā mea hoʻoheheʻe organik (e like me ka ethanol, isopropyl alcohol, etc.), e hāʻawi ana iā ia me nā pono i kekahi mau noi kūikawā, e like me nā hoʻokumu ʻana i nā mea hoʻoheheʻe organik a me kekahi mau hoʻomākaukau lāʻau.

3. Nā ʻokoʻa i ka hopena mānoanoa a me ka rheology

Hiki i ka HEC ke mānoanoa maikaʻi a hiki ke hoʻonui nui i ka viscosity o ka hopena i loko o ka wai wai, no laila hoʻohana pinepine ʻia e like me ka mānoanoa, stabilizer a me ka gelling agent. Hoʻopili ʻia ka hopena mānoanoa o HEC e ke kaumaha molekala a me ka pae o ka hoʻololi ʻana. ʻOi aku ka nui o ke kaumaha molekala a ʻoi aku ka kiʻekiʻe o ke kiʻekiʻe o ka hoʻololi ʻana, ʻoi aku ka nui o ka viscosity o ka hopena. I ka manawa like, he pseudoplastic ka hana rheological o nā solutions HEC, ʻo ia hoʻi, i ka piʻi ʻana o ka shear rate, emi ka viscosity o ka hopena, he mea kōkua nui ia no nā formulations e pono ai ke kūpaʻa a me ka flowability maikaʻi.

He palupalu ka hopena mānoanoa o ka HPC, akā ma muli o kāna mau hiʻohiʻona molecular structure, hōʻike ʻia kāna mau hopena i nā waiwai rheological like ʻole. Loaʻa i ka HPC nā waiwai wai Newtonian, ʻo ia hoʻi, kūʻokoʻa ka viscosity solution i ka shear rate, he mea nui loa ia i kekahi mau noi e koi ana i ka viscosity like. Eia kekahi, loaʻa iā HPC nā waiwai hana kiʻiʻoniʻoni maikaʻi, kahi e hoʻohana nui ʻia ai i nā kula e like me nā lāʻau lapaʻau a me nā uhi.

4. Paʻa a me ka pale kemika

Hōʻike ka HEC i ke kūpaʻa kemika kiʻekiʻe ma nā pae waiwai pH like ʻole a hiki ke hana maʻamau i ka pae pH o 2 a hiki i 12. No laila, kūpono ʻo HEC no ka hoʻohana ʻana ma lalo o nā kūlana acidic a me ka alkaline a hoʻohana nui ʻia i nā detergents, cosmetics a me nā māla ʻē aʻe.

ʻOiai he paʻa kemika maikaʻi ka HPC, ʻoi aku ka liʻiliʻi o kona hiki ke hoʻololi i ka waiwai pH, a kūpono ia no nā kaiapuni kūʻokoʻa a nāwaliwali paha. I kekahi mau kūlana i makemake ʻia ai ka hoʻokumu ʻana o ke kiʻiʻoniʻoni a i ʻole ka hydrophobicity, hiki i ka HPC ke hāʻawi i ka hana maikaʻi loa ma muli o kona ʻano kūikawā, e like me kahi mea hoʻokuʻu hoʻomau a i ʻole ka mea uhi no nā lāʻau.

5. Nā ʻokoʻa ma nā kahua noi

ʻO nā māhele noi o HEC ka mea nui:

Nā Mea Hana Hana: Ma ke ʻano he mānoanoa a me ka gelling agent, hoʻohana nui ʻia ʻo HEC i nā mea hana sima, nā uhi a me nā mīkini hana e kōkua ai i ka hoʻomaikaʻi ʻana i ka hana hana a me ke kūpaʻa wai.

ʻO nā uhi a me nā pena: Hoʻohana ʻia ʻo HEC i ka uhi wai e mānoanoa, hoʻokuʻu, hoʻopuehu a hoʻopaʻa, a laila e hoʻomaikaʻi ai i ka hoʻohana ʻana o ka uhi a me ke ʻano.

Nā huahana kemika o kēlā me kēia lā: I nā huahana kemika o kēlā me kēia lā e like me nā mea holoi a me nā shampoos, lawelawe ʻo HEC ma ke ʻano he mānoanoa a me ka stabilizer, hiki ke hoʻomaikaʻi i ke ʻano a me ka ʻike hoʻohana o ka huahana.

Aia nā wahi noi nui o HPC:

Kahua lāʻau lapaʻau: Hoʻohana pinepine ʻia ʻo HPC ma ke ʻano he mea uhi a me ka hoʻomākaukau hoʻokuʻu hoʻomau ʻia no nā lāʻau lapaʻau ma muli o kāna mau waiwai kiʻiʻoniʻoni maikaʻi loa a hoʻokuʻu mau ʻia. Eia kekahi, loaʻa iā ia nā noi koʻikoʻi i nā binder papa.

Meaʻai a me nā mea hoʻonaninani: Hoʻohana ʻia ʻo HPC ma ke ʻano he mānoanoa a me ka emulsifier i ka ʻoihana meaʻai, a ma ke ʻano he mea hana kiʻiʻoniʻoni i nā mea hoʻonaninani e kōkua i ka hoʻomaikaʻi ʻana i ke ʻano a me ka ductility o nā huahana.

ʻO nā uhi a me nā ʻīnika: Ma muli o kona solubility a me nā waiwai hana kiʻiʻoniʻoni, hoʻohana pinepine ʻia ʻo HPC i ka uhi ʻana a me nā ʻīnika e koi ai i nā mea hoʻoheheʻe organik, e hāʻawi ana i nā papa kiʻiʻoniʻoni maʻalahi a me ka flowability maikaʻi.

6. Ka palekana a me ka palekana

Manaʻo ʻia ʻo HEC a me HPC he mau mea palekana no ke kino o ke kanaka a me ke kaiapuni a hoʻohana nui ʻia i nā huahana e pono ai ke hoʻopili ʻana me ke kino kanaka, e like me nā mea hoʻonaninani a me nā lāʻau lapaʻau. Eia nō naʻe, hiki ke hoʻoheheʻe ʻia ka HPC i kekahi mau mea hoʻoheheʻe kūlohelohe, hiki ke hoʻokō i kekahi mau pilikia i nā noi me nā koina kaiapuni kiʻekiʻe, ʻoiai ʻo HEC i hoʻohana nui ʻia i nā hoʻoheheʻe wai, no laila ʻoi aku ka maʻalahi o ka hoʻokō ʻana i nā koi kūlohelohe ʻōmaʻomaʻo.

ʻO ka Hydroxyethyl cellulose (HEC) a me ka hydroxypropyl cellulose (HPC), ma ke ʻano he cellulose derivatives, loaʻa nā mea like i ka hoʻolālā kemika, solubility, thickening effect, rheological properties, application fields and environmental protection properties. Nui nā ʻokoʻa ma nā ʻano. Ma muli o kona hoʻoheheʻe wai maikaʻi loa a me nā waiwai mānoanoa, hoʻohana nui ʻia ʻo HEC i nā hoʻoheheʻe ʻana i ka wai, e like me nā uhi, nā mea kūkulu hale a me nā huahana kemika i kēlā me kēia lā. Loaʻa i ka HPC nā noi kūikawā i nā lāʻau lapaʻau, nā meaʻai a me kekahi mau uhi kūikawā ma muli o kona solubility, hana kiʻiʻoniʻoni a me nā waiwai hoʻokuʻu hoʻomau. ʻO ke koho ʻana o ka cellulose derivative e hoʻohana maʻamau e pili ana i nā pono noi kikoʻī a me nā koi hoʻolālā.


Ka manawa hoʻouna: Oct-29-2024
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