ʻOkoʻa ma waena o HEC a me EC

ʻO HEC a me EC nā ʻano ʻelua o ka cellulose ethers me nā waiwai like ʻole a me nā noi. ʻO HEC ke kū nei no ka hydroxyethyl cellulose, aʻo ka EC ke kū nei no ka ethyl cellulose. Ma kēia ʻatikala, e kūkākūkā mākou i nā ʻokoʻa ma waena o HEC a me EC e pili ana i kā lākou hana kemika, waiwai, hoʻohana, a me ka palekana.

1. Hoʻolālā Kimia

Loaʻa i ka HEC a me EC nā hale kemika ʻokoʻa e hāʻawi iā lākou i nā waiwai like ʻole. ʻO HEC he polymer hiki ke hoʻoheheʻe ʻia i ka wai i loaʻa mai ka cellulose. He cellulose ether i hoʻololi ʻia i loaʻa nā hui hydroxyethyl i pili i ka iwi kuamoʻo cellulose. ʻO ke degere o ka hoʻololi ʻana (DS) o HEC e pili ana i ka helu o nā pūʻulu hydroxyethyl i loaʻa i kēlā me kēia anhydroglucose unit (AGU) o ka iwi kuamoʻo cellulose. Hiki ke DS o HEC mai ka 0.1 a hiki i ka 3.0, me nā koina DS kiʻekiʻe e hōʻike ana i kahi kiʻekiʻe o ka hoʻololi.

ʻO EC, ma ka ʻaoʻao ʻē aʻe, he polymer hiki ʻole i ka wai i loaʻa mai ka cellulose. He ether cellulose i hoʻololi ʻia me nā hui ethyl i hoʻopili ʻia i ka iwi kuamoʻo cellulose. ʻO ka DS o EC e pili ana i ka helu o nā hui ethyl i loaʻa i kēlā me kēia AGU o ka iwi kuamoʻo cellulose. Hiki i ka DS o EC mai 1.7 a i 2.9, me nā koina DS kiʻekiʻe e hōʻike ana i kahi kiʻekiʻe o ka hoʻololi.

2. Waiwai

Loaʻa iā HEC a me EC nā waiwai like ʻole i kūpono iā lākou no nā noi like ʻole. Aia kekahi o nā waiwai nui o HEC a me EC ma lalo nei:

a. Solubility: He mea hiki ke hoʻoheheʻe ʻia ka HEC i ka wai, ʻoiai ʻaʻole hiki ke hoʻoheheʻe ʻia ʻo EC i ka wai. Eia naʻe, hiki ke hoʻoheheʻe ʻia ka EC i nā mea hoʻoheheʻe organik e like me ka ethanol, acetone, a me ka chloroform.

b. Rheology: He mea pseudoplastic ka HEC, ʻo ia hoʻi, hōʻike ia i ke ʻano ʻāhiʻi ʻoki. ʻO ia ke ʻano o ka emi ʻana o ka viscosity o HEC i ka piʻi ʻana o ka shear rate. ʻO EC, ma ka ʻaoʻao ʻē aʻe, he mea thermoplastic, ʻo ia hoʻi e hiki ke hoʻoheheʻe ʻia a hoʻoheheʻe ʻia ke hoʻomehana ʻia.

c. Nā waiwai hana kiʻiʻoniʻoni: Loaʻa i ka HEC nā waiwai hana kiʻiʻoniʻoni maikaʻi, i kūpono ia no ka hoʻohana ʻana i nā uhi a me nā kiʻiʻoniʻoni. Loaʻa iā EC nā waiwai hana kiʻiʻoniʻoni, akā hiki i nā kiʻiʻoniʻoni ke palupalu a hiki i ka pohā.

d. Paʻa: Paʻa ka HEC ma luna o kahi ākea o ka pH a me nā kūlana wela. Paʻa nō hoʻi ʻo EC ma kahi ākea pH ākea, akā hiki ke hoʻopili ʻia kona kūpaʻa e nā wela kiʻekiʻe.

3. Hoʻohana

Hoʻohana ʻia ʻo HEC a me EC ma kahi ākea o nā noi i ka meaʻai, lāʻau lapaʻau, a me nā ʻoihana mālama pilikino. Aia kekahi o nā hoʻohana nui o HEC a me EC ma lalo nei:

a. ʻOihana meaʻai: Hoʻohana maʻamau ʻia ʻo HEC ma ke ʻano he mānoanoa, stabilizer, a me ka emulsifier i nā huahana meaʻai e like me nā kīʻaha, nā lole, a me nā mea i kālua ʻia. Hoʻohana ʻia ʻo EC ma ke ʻano he mea uhi no nā huahana meaʻai e like me ka nau ʻana, nā mea ʻono, a me nā huaʻai.

b. ʻOihana lāʻau lapaʻau: Hoʻohana ʻia ʻo HEC ma ke ʻano he mea hoʻopaʻa, disintegrant, a me ka mea hoʻopili papa papa i nā hana lāʻau lapaʻau. Hoʻohana ʻia ʻo EC ma ke ʻano he binder, coating agent, a me ka mea hoʻokuʻu hoʻomau i loko o nā mea hana lāʻau.

4. Palekana

Manaʻo ʻia ʻo HEC a me EC he palekana no ka hoʻohana ʻana i ka meaʻai a me nā noi lāʻau. Eia naʻe, e like me nā mea kemika, aia kekahi mau pilikia e pili ana i kā lākou hoʻohana. He mea nui e hahai i nā alakaʻi i ʻōlelo ʻia no ka hoʻohana ʻana iā HEC a me EC e hōʻoia i ko lākou hoʻohana palekana a maikaʻi.