ʻO ka polyanionic cellulose (PAC) he wai-soluble cellulose derivative i loaʻa i ka nui o nā noi i nā ʻoihana like ʻole, ʻoi aku ka nui o ka ʻoihana hoʻoheheʻe wai i ka ʻoihana aila a me ke kinoea.Ua ʻike ʻia no kāna mau waiwai rheological maikaʻi loa, kūpaʻa kiʻekiʻe a me ka launa pū me nā mea hoʻohui ʻē aʻe.ʻO ka hana ʻana o ka cellulose polyanionic e pili ana i nā ʻanuʻu he nui, e komo pū me ka ʻili cellulose, hoʻololi kemika, a me ka hoʻomaʻemaʻe.
1. ʻO ka unuhi ʻana o ka cellulose:
ʻO ka mea hoʻomaka no ka polyanionic cellulose he cellulose, he polymer maoli i loaʻa i loko o nā paia o nā mea kanu.Hiki ke kiʻi ʻia mai ka cellulose mai nā mea kanu like ʻole, e like me ka pulp lāʻau, ka pulupulu linters, a i ʻole nā mea kanu fibrous ʻē aʻe.Aia i loko o ke kaʻina hana unuhi kēia mau ʻanuʻu:
A. Hoʻomākaukau mea maka:
Hoʻomaʻamaʻa mua ʻia nā mea kanu i koho ʻia e wehe i nā haumia e like me ka lignin, hemicellulose a me ka pectin.Hoʻokō pinepine ʻia kēia ma o ka hui pū ʻana o nā lāʻau mechanical a me kemika.
b.Pulping:
Hoʻopili ʻia ka mea i hoʻomaʻamaʻa mua ʻia, kahi kaʻina e wāwahi ai i nā fiber cellulose.ʻO nā ʻano pulping maʻamau ka pulping kraft a me ka pulping sulfite, kēlā me kēia me kona pono ponoʻī a me nā hemahema.
C. Hoʻokaʻawale i ka cellulose:
Hoʻopili ʻia ka mea pulp e hoʻokaʻawale i nā fiber cellulosic.Hoʻopili maʻamau kēia i kahi kaʻina holoi holoi a bleaching no ka loaʻa ʻana o nā mea cellulosic maʻemaʻe.
2. Hoʻololi kemika:
Ke loaʻa ka cellulose, ua hoʻololi kemika ia e hoʻolauna i nā pūʻulu anionic, e hoʻohuli iā ia i cellulose polyanionic.ʻO kahi ʻano hana maʻamau no kēia kumu ʻo ka etherification.
A. Etherification:
Hoʻopili ka Etherification i ka pane ʻana o ka cellulose me kahi mea etherifying e hoʻolauna i nā loulou ether.I ka hihia o ka polyanionic cellulose, hoʻokomo pinepine ʻia nā hui carboxymethyl.Loaʻa kēia ma ka hopena me ka sodium monochloroacetate i mua o kahi catalyst kumu.
b.Ka hopena o ka Carboxymethylation:
ʻO ka hopena carboxymethylation e pili ana i ka hoʻololi ʻana o nā mana hydrogen ma nā pūʻulu hydroxyl o cellulose me nā hui carboxymethyl.He mea koʻikoʻi kēia pane no ka hoʻokomo ʻana i nā koina anionic ma ka iwi kuamoʻo cellulose.
C. neutralize:
Ma hope o ka carboxymethylation, hoʻokaʻawale ʻia ka huahana e hoʻohuli i ka hui carboxymethyl i nā ion carboxylate.He mea koʻikoʻi kēia ʻanuʻu i ka hana ʻana i ka polyanionic cellulose i ka wai.
3. Hoomaemae:
Hoʻomaʻemaʻe ʻia ka cellulose i hoʻololi ʻia no ka wehe ʻana i nā huahana by-products, nā kemika i hana ʻole ʻia, a me nā haumia e hoʻopilikia i kāna hana ma kahi noi kikoʻī.
A. holoi:
Hoʻomaʻemaʻe maikaʻi ʻia nā huahana e wehe i nā reactants keu, nā paʻakai a me nā haumia ʻē aʻe.Hoʻohana pinepine ʻia ka wai no kēia kumu.
b.Hoʻomaloʻo:
Hoʻomaloʻo ʻia ka cellulose polyanionic i hoʻomaʻemaʻe ʻia no ka loaʻa ʻana o ka huahana hope loa i ka pauka a i ʻole ke ʻano granular.
4. Mana maikaʻi:
Hoʻokō ʻia nā hana hoʻomalu maikaʻi i loko o ke kaʻina hana e hōʻoia i ka hopena o ka polyanionic cellulose e hoʻokō i nā kikoʻī i koi ʻia.Hoʻopili kēia i ka hoʻāʻo ʻana i ke kaumaha molekala, degere o ka hoʻololi ʻana a me nā ʻāpana kūpono ʻē aʻe.
5. Noi:
Loaʻa i ka polyanionic cellulose nā noi i nā ʻoihana like ʻole, ka mea nui i nā ʻōnaehana wai i loko o ka ʻoihana aila a me ke kinoea.Hana ʻo ia ma ke ʻano he tackifier, ka mea hoʻokele wai kahe a me ka shale inhibitor, e hoʻomaikaʻi i ka hana holoʻokoʻa o ka wai wili.ʻO nā noi ʻē aʻe e pili ana i nā ʻoihana meaʻai a me nā lāʻau lapaʻau kahi i hāʻawi ʻia ai nā pono o ka wai a me nā waiwai rheological.
ʻO ka polyanionic cellulose he mea maʻalahi a waiwai hoʻi ka cellulose derivative nona ka hana e pono ai kahi ʻano o nā ʻanuʻu.ʻO ka unuhi ʻana o cellulose mai nā mea kanu, hoʻololi kemika ma o ka etherification, hoʻomaʻemaʻe a me ka hoʻokele maikaʻi ʻana he mau ʻāpana o ka hana hana.ʻO ka hopena o ka polyanionic cellulose he mea koʻikoʻi i loko o nā ʻano hana ʻenehana, e kōkua ana i ka hoʻomaikaʻi ʻana i ka hana a me ka hana o nā ʻano hana like ʻole.Ke hoʻomau nei ka hoʻomohala ʻana o ka ʻoihana, koi ʻia ka noi no nā derivatives cellulose kūikawā e like me ka polyanionic cellulose e manaʻo ʻia e ulu, e hoʻomau i ka noiʻi a me ka hoʻomohala ʻana i nā ʻenehana hoʻololi cellulose a me nā noi.
Ka manawa hoʻouna: Dec-26-2023