Hoʻomaʻemaʻe i ka Hydroxyethyl cellulose

Hoʻomaʻemaʻe i ka Hydroxyethyl cellulose

ʻO ka Hydroxyethyl cellulose (HEC) he polymer wai-soluble i hoʻohana nui ʻia i nā ʻoihana like ʻole, me ke kūkulu ʻana, mālama pilikino, a me nā lāʻau lapaʻau. Hana ʻia ia e ka hoʻololi kemika o cellulose, kahi e hoʻololi ai i nā pūʻulu hydroxyl ma ke kaulahao cellulose me nā hui hydroxyethyl. Hiki ke ʻokoʻa ka pae o ka hoʻololi ʻana (DS) o HEC mai 1.5 a i 2.8, ma muli o ka noi.

ʻO ka hana ʻana o HEC e pili ana i kekahi mau hana hoʻomaʻemaʻe e hōʻoia i ka maikaʻi a me ke kūlike o ka huahana hope. Aia kēia mau ʻanuʻu:

1. ʻO ka hoʻomaʻemaʻe cellulose: ʻO ka hana mua i ka hana HEC ka hoʻomaʻemaʻe ʻana i ka cellulose. Hoʻopili kēia i ka wehe ʻana i nā mea haumia, e like me ka lignin a me ka hemicellulose, mai ke kumu cellulose, hiki ke lilo i pulp lāʻau a i ʻole nā ​​lints pulupulu. Hiki i ke kaʻina hana hoʻomaʻemaʻe ke komo i kekahi mau ʻanuʻu, e like me ka bleaching, ka holoi ʻana, a me ka kānana ʻana, ma muli o ka maikaʻi o ke kumu cellulose.
2. Lapaʻau alkali: Hoʻomaʻemaʻe ʻia ka cellulose i hoʻomaʻemaʻe ʻia me kahi solution alkali, e like me ka sodium hydroxide a i ʻole potassium hydroxide, e hana i ka cellulose alkali. Pono kēia ʻanuʻu e hoʻomākaukau i ka cellulose no ka pae aʻe, ʻo ia ka etherification.
3. Etherification: Hoʻopili ʻia ka cellulose alkali me ka ethylene oxide e hana i ka HEC. Hana ʻia kēia pane ma ke alo o kahi catalyst, e like me ka sodium hydroxide a i ʻole ka sodium methylate, ma nā wela kiʻekiʻe a me nā kaomi. Hoʻoponopono maikaʻi ʻia ka manawa pane a me ka mahana no ka loaʻa ʻana o ke degere i makemake ʻia.
4. Neutralization: Ma hope o ka hopena etherification, hoʻokaʻawale ʻia ka HEC me kahi waikawa, e like me ka acetic acid a i ʻole ka waikawa citric, e hoʻoponopono i ka pH i kahi pae kūʻokoʻa. Pono kēia ʻanuʻu e pale i ka HEC mai ka hoʻohaʻahaʻa ʻana i ka manawa.
5. Holoi a hoʻomaloʻo: A laila holoi ʻia ka HEC a hoʻomaloʻo ʻia e wehe i nā koena haumia a me ka wai. Hana ʻia ke kaʻina hoʻomaloʻo ma nā haʻahaʻa haʻahaʻa e pale i ka HEC mai ka hoʻohaʻahaʻa ʻana.
6. Ka mana maikaʻi: ʻO ka hana hope loa i ka hana HEC ka mana maikaʻi. Hoʻāʻo ʻia ka HEC no nā ʻāpana like ʻole, e like me ka viscosity, moisture content, a me ka maʻemaʻe, e hōʻoia i ka hoʻokō ʻana i nā kikoʻī i koi ʻia no ka noi i manaʻo ʻia.

Ma kahi o kēia mau ʻanuʻu hoʻomaʻemaʻe, aia kekahi mau mea e hiki ke hoʻopilikia i ka maikaʻi a me ka hana o HEC, me:

1. Degree of substitution: Hiki i ka degere o ka hoʻololi ʻana (DS) o HEC ke hoʻopili i kona solubility, viscosity, a me nā waiwai gelation. Hiki i kahi DS kiʻekiʻe ke hopena i kahi HEC ʻoi aku ka viscous a me ka gel-like, aʻo ka DS haʻahaʻa hiki ke hopena i kahi HEC ʻoi aku ka soluble a me ka wai.
2. Kaumaha Molekala: Hiki i ke kaumaha mole o HEC ke hoʻopili i kona viscosity a me kāna ʻano hoʻonā. Hiki i ke kaumaha molecular kiʻekiʻe ke hopena i ka HEC ʻoi aku ka viscous a me ka gel-like, aʻo ke kaumaha molekala haʻahaʻa hiki ke hopena i kahi HEC hiki ke hoʻoheheʻe a me ka wai.
3. Maʻemaʻe: Hiki i ka maʻemaʻe o HEC ke hoʻopili i kāna hana a paʻa. Hiki i nā haumia, e like me ke koena alkali a i ʻole catalyst, hiki ke hoʻohaʻahaʻa i ka HEC i ka manawa a hoʻopilikia i kona solubility a me ka viscosity.
4. pH: Hiki i ka pH o ka hopena HEC ke hoʻopili i kona kūpaʻa a me ka viscosity. Hiki i ka pH ke kiʻekiʻe a haʻahaʻa paha ke kumu e hoʻohaʻahaʻa ai ka HEC i kona viscosity.

Hoʻohana pinepine ʻia ʻo HEC ma ke ʻano he mānoanoa, binder, a me emulsifier i nā ʻoihana like ʻole, me ke kūkulu ʻana, mālama pilikino, a me nā lāʻau lapaʻau. I ka ʻoihana kūkulu, hoʻohana ʻia ʻo HEC ma ke ʻano he mea hoʻohui i nā huahana ciment-based e hoʻomaikaʻi i ka hana, paʻa wai, a me ka ikaika paʻa. I nā huahana mālama pilikino, hoʻohana ʻia ʻo HEC ma ke ʻano he mānoanoa a me ka stabilizer

no ka hoʻomaikaʻi ʻana i ke ʻano a me ka paʻa o nā ʻano hana, e like me nā shampoos, lotions, a me nā ʻaila. I loko o ka ʻoihana lāʻau lapaʻau, hoʻohana ʻia ʻo HEC ma ke ʻano he mea hoʻopaʻa a me ka disintegrant i nā papa papa.

No ka hōʻoia ʻana i ka hana i makemake ʻia o HEC i kēia mau noi, he mea nui e hoʻohana i kahi huahana kiʻekiʻe i hoʻomaʻemaʻe ʻia a hoʻāʻo ʻia e hoʻokō i nā kikoʻī i koi ʻia. Ma kahi o nā ʻanuʻu hoʻomaʻemaʻe i hōʻike ʻia ma luna, hiki i nā mea hana ke hoʻohana i nā ʻenehana hou, e like me ka kānana, e hoʻomaʻemaʻe hou a hoʻomaʻemaʻe i ka HEC.

ʻO ka holoʻokoʻa, ʻo ka hoʻomaʻemaʻe ʻana o HEC kahi hana koʻikoʻi i kāna hana ʻana e hōʻoia i ka hoʻokō ʻana o ka huahana hope i nā kikoʻī i koi ʻia no ka noi i manaʻo ʻia. ʻO ke kaʻina hana e pili ana i kekahi mau ʻanuʻu, me ka hoʻomaʻemaʻe cellulose, ka mālama ʻana i ka alkali, etherification, neutralization, holoi a maloʻo, a me ka mana maikaʻi. ʻO ke kiʻekiʻe o ka hoʻololi ʻana, ka paona molekala, ka maʻemaʻe, a me ka pH o ka HEC hiki ke hoʻopili i kāna hana a me ke kūpaʻa, a pono e mālama pono nā mea hana i kēia mau mea e hana i kahi huahana kiʻekiʻe. Me ka hoʻomaʻemaʻe kūpono a me ka mana maikaʻi, hiki i ka HEC ke hāʻawi i nā waiwai waiwai a me nā pōmaikaʻi i nā ʻano noi.