He koʻikoʻi ka pH o ka Hydroxyethyl Cellulose?

ʻO ka Hydroxyethylcellulose (HEC) he polymer non-ionic wai-soluble i hoʻohana nui ʻia i nā uhi, nā mea hoʻonaninani, nā mea kūkulu hale, nā lāʻau lapaʻau a me nā ʻoihana ʻē aʻe. ʻO kāna hana nui e like me ka mānoanoa, ka mea hoʻokuʻu, ka mea hana kiʻiʻoniʻoni a me ka stabilizer, hiki ke hoʻomaikaʻi nui i nā waiwai rheological o ka huahana. He mea hiki ke hoʻoheheʻe maikaʻi ʻia ka HEC, mānoanoa, hana kiʻiʻoniʻoni a me ka hoʻohālikelike ʻana, no laila makemake ʻia ia i nā kula he nui. Eia nō naʻe, e pili ana i ka kūpaʻa o HEC a me kāna hana i nā ʻano pH like ʻole, he mea koʻikoʻi ia e pono e noʻonoʻo ʻia i nā noi kūpono.

Ma ke ʻano o ka ʻike pH, hydroxyethylcellulose, ma ke ʻano he polymer non-ionic, ʻoi aku ka liʻiliʻi o ka maʻalahi i nā loli pH. He ʻokoʻa kēia mai kekahi mau mea mānoanoa ionic ʻē aʻe (e like me ka carboxymethylcellulose a i ʻole kekahi polymers acrylic), aia nā pūʻulu ionic i loko o kā lākou mau molekala a hiki ke hoʻokaʻawale ʻia a ionization paha i loko o nā kaiapuni acidic a alkaline. , no laila e pili ana i ka hopena mānoanoa a me nā waiwai rheological o ka hopena. No ka mea, ʻaʻohe uku o ka HEC, paʻa mau kona hopena mānoanoa a me nā waiwai solubility ma luna o kahi ākea pH ākea (ʻo ia ka pH 3 a i ka pH 11). ʻO kēia hiʻohiʻona hiki iā HEC ke hoʻololi i nā ʻōnaehana formulation like ʻole a hiki ke hoʻokō i kahi hopena mānoanoa maikaʻi ma lalo o nā kūlana acidic, neutral a nāwaliwali alkaline.

ʻOiai he kūpaʻa maikaʻi ka HEC ma lalo o ka hapa nui o nā kūlana pH, hiki ke hoʻopilikia ʻia kāna hana ma nā wahi pH kiʻekiʻe loa, e like me nā kaiapuni ʻakika a alkaline. No ka laʻana, ma lalo o nā kūlana ʻakika loa (pH <3), hiki ke hoʻemi ʻia ka solubility o HEC a ʻaʻole i like ka nui o ka hopena mānoanoa e like me nā kaiapuni kūʻokoʻa a ʻakika iki paha. ʻO kēia no ka mea e hoʻopili ka nui o ka hydrogen ion i ka conformation o ke kaulahao mole HEC, e hōʻemi ana i kona hiki ke hoʻopuehu a pehu i ka wai. Pēlā nō, ma lalo o nā kūlana alkaline loa (pH> 11), hiki i ka HEC ke hoʻohaʻahaʻa hapa a i ʻole ka hoʻololi kemika, e pili ana i kona hopena mānoanoa.

Ma waho aʻe o ka solubility a me nā hopena mānoanoa, hiki i ka pH ke hoʻopili i ka hoʻohālikelike ʻana o HEC me nā mea hana ʻē aʻe. Ma lalo o nā kaiapuni pH like ʻole, hiki ke hoʻokaʻawale a hoʻokaʻawale paha kekahi mau mea hana, a laila hoʻololi i kā lākou pilina me HEC. No ka laʻana, ma lalo o nā kūlana ʻawaʻawa, hiki i kekahi mau ion metala a i ʻole nā ​​mea hana cationic ke hana i nā paʻakikī me ka HEC, e hoʻonāwaliwali ai a hoʻoheheʻe paha kona hopena mānoanoa. No laila, i ka hoʻolālā hoʻolālā, pono e noʻonoʻo ʻia ka pilina ma waena o HEC a me nā mea ʻē aʻe ma lalo o nā kūlana pH like ʻole e hōʻoia i ka paʻa a me ka hana o ka ʻōnaehana holoʻokoʻa.

ʻOiai ʻo ka HEC ponoʻī ʻoi aku ka liʻiliʻi o ka hoʻololi ʻana i ka pH, hiki ke hoʻopili ʻia kona helu dissolution a me kāna kaʻina hoʻoheheʻe e ka pH. Hoʻoheheʻe pinepine ʻia ka HEC ma lalo o nā kūlana kūʻokoʻa a i ʻole ka ʻakika liʻiliʻi, ʻoiai ma lalo o nā kūlana ʻawaʻawa a i ʻole ka alkaline hiki ke lohi ke kaʻina hoʻoheheʻe. No laila, i ka hoʻomākaukau ʻana i nā haʻina, ʻōlelo pinepine ʻia e hoʻohui mua i ka HEC i kahi wai wai kūʻokoʻa a i ʻole kokoke-neutral e hōʻoia i ka hoʻoheheʻe koke ʻana.

ʻO ka Hydroxyethylcellulose (HEC), ma ke ʻano he polymer non-ionic, ʻaʻole i maʻalahi i ka pH a hiki ke mālama i nā hopena mānoanoa paʻa a me nā waiwai solubility ma kahi ākea pH ākea. Paʻa kona hana ma ka laulā o ka pH 3 a i ka pH 11, akā i loko o ka waika nui a me nā wahi alkali, hiki ke hoʻopili ʻia kona hopena mānoanoa a me ka solubility. No laila, i ka noi ʻana iā HEC, ʻoiai i ka hapa nui o nā hihia ʻaʻole pono e uku nui i nā loli pH, ma lalo o nā kūlana koʻikoʻi, pono mau ka hoʻāʻo a me nā hoʻoponopono kūpono e hōʻoia i ka paʻa a me ka hana o ka ʻōnaehana.