Ka Hana Hana ʻana o ka sodium carboxymethylcellulose

ʻO ke kaʻina hana o ka sodium carboxymethylcellulose (CMC) e pili ana i kekahi mau ʻanuʻu, me ka hoʻomākaukau ʻana i ka cellulose, etherification, hoʻomaʻemaʻe, a me ka maloʻo. Eia kahi hiʻohiʻona o ke kaʻina hana maʻamau:

1. Ka Hoʻomākaukau ʻana i ka Cellulose: Hoʻomaka ka hana me ka hoʻomākaukau ʻana i ka cellulose, ka mea maʻamau i loaʻa mai ka pulp lāʻau a i ʻole ka pulupulu liters. Hoʻomaʻemaʻe mua ʻia ka cellulose a hoʻomaʻemaʻe ʻia e wehe i nā haumia e like me ka lignin, hemicellulose, a me nā mea haumia ʻē aʻe. ʻO kēia cellulose i hoʻomaʻemaʻe ʻia ka mea hoʻomaka no ka hana ʻana o CMC.
2. Alkalization: A laila mālama ʻia ka cellulose i hoʻomaʻemaʻe ʻia me kahi solution alkaline, maʻamau ka sodium hydroxide (NaOH), e hoʻonui i kona reactivity a hoʻomaʻamaʻa i ka hopena etherification. Kōkua pū ka Alkalization i ka pehu a wehe i nā fiber cellulose, e maʻalahi iā lākou i ka hoʻololi kemika.
3. Etherification Reaction: Hoʻopili ʻia ka cellulose alkalized me ka monochloroacetic acid (MCA) a i ʻole kona paʻakai sodium, sodium monochloroacetate (SMCA), i mua o kahi catalyst ma lalo o nā kūlana hoʻomalu. ʻO kēia hopena etherification e pili ana i ka hoʻololi ʻana o nā pūʻulu hydroxyl ma nā kaulahao cellulose me nā hui carboxymethyl (-CH2COONa). Hiki ke ho'omalu 'ia ke degere o ka ho'ololi 'ana (DS), 'o ia ka helu awelika o nā pū'ulu carboxymethyl no kēlā me kēia 'āpana glucose o ke kaulahao cellulose, ma ka ho'oponopono 'ana i nā palena ho'ololi e like me ka mahana, ka manawa pane, a me nā mana'o reactant.
4. Neutralization: Ma hope o ka hoʻoheheʻe ʻana, hoʻokaʻawale ʻia ka huahana e hoʻohuli i nā pūʻulu waikawa i koe i ko lākou ʻano paʻakai sodium (carboxymethylcellulose sodium). Loaʻa ʻia kēia ma ka hoʻohui ʻana i kahi hopena alkaline, e like me ka sodium hydroxide (NaOH), i ka hui ʻana. Kōkua ka neutralization e hoʻoponopono i ka pH o ka hopena a hoʻopaʻa i ka huahana CMC.
5. Hoʻomaʻemaʻe: Hoʻomaʻemaʻe ʻia ka sodium carboxymethylcellulose maʻemaʻe no ka wehe ʻana i nā haumia, nā reagents unreacted, a me nā huahana mai ka hui ʻana. Hiki i nā ʻano hoʻomaʻemaʻe ke komo i ka holoi, kānana, centrifugation, a me ka maloʻo. Holoi ʻia ka CMC i hoʻomaʻemaʻe ʻia me ka wai e wehe i ke koena alkali a me nā paʻakai, a ukali ʻia e ka kānana a i ʻole ka centrifugation e hoʻokaʻawale i ka huahana CMC paʻa mai ka pae wai.
6. Hoʻomaloʻo: Hoʻomaloʻo hope ʻia ka sodium carboxymethylcellulose i hoʻomaʻemaʻe ʻia no ka wehe ʻana i ka wai nui a loaʻa ka ʻoluʻolu i makemake ʻia no ka mālama ʻana a me ka hana hou ʻana. Hiki ke hoʻomaloʻo i ka ea, ka hoʻomaloʻo ʻana, a i ʻole ka hoʻomaloʻo pahu, ma muli o nā ʻano huahana i makemake ʻia a me ka unahi hana.

ʻO ka hopena o ka sodium carboxymethylcellulose huahana he keʻokeʻo a i ʻole keʻokeʻo keʻokeʻo a i ʻole nā ​​mea granular me ka hoʻoheheʻe wai maikaʻi a me nā waiwai rheological. Hoʻohana nui ʻia ia ma ke ʻano he mānoanoa mānoanoa, stabilizer, binder, a me rheology modifier i nā ʻoihana like ʻole, me ka meaʻai, nā lāʻau lapaʻau, nā mea hoʻonaninani, nā textiles, a me nā noi ʻoihana.