Ma o ka nānā ʻana a me ka hōʻuluʻulu ʻana o nā hopena hoʻāʻo cellulose ether ma nā mokuna ʻekolu, ʻo nā hopena nui e like me kēia:
5.1 Ka hopena
1. Cellulose ether ka unuhi ana mai na mea kanu maka
(1) Ua ana ʻia nā ʻāpana o nā mea kanu ʻelima (ka mākū, ka lehu, ka maikaʻi o ka lāʻau, ka cellulose a me ka hemicellulose), a ua koho ʻia ʻekolu mau mea kanu mea kanu, ka ʻōpala paina a me ka mauʻu palaoa.
a me ka bagasse e unuhi i ka cellulose, a ua hoʻoikaika ʻia ke kaʻina hana o ka ʻili cellulose.Ma lalo o ka optimized kaʻina kūlana, ka
ʻO ka maʻemaʻe pili o ka lignoscellulose, ka mauʻu palaoa cellulose a me ka bagasse cellulose ua ʻoi aku ma luna o 90%, a ʻo kā lākou hua ma luna o 40%.
(2) Mai ka nānā ʻana i ka spectrum infrared, hiki ke ʻike ʻia ma hope o ka mālama ʻana, lawe ʻia nā huahana cellulose mai ka mauʻu palaoa, bagasse a me ka sawdust pine.
Ma ka 1510 knm-1 (ka ha'alulu iwi o ke apo benzene) a ma kahi o 1730 knm-1 (ka ho'opa'a 'ana i ka vibration o ka carbonyl C=O non-conjugated)
ʻAʻohe piko, e hōʻike ana ua wehe maoli ʻia ka lignin a me ka hemicellulose i loko o ka huahana i unuhi ʻia, a ʻo ka cellulose i loaʻa he maʻemaʻe kiʻekiʻe.ma ka poni
Hiki ke ʻike ʻia mai ka spectrum absorption waho e emi mau ana ka maʻiʻo pili o ka lignin ma hope o kēlā me kēia ʻanuʻu o ka mālama ʻana, a ke emi nei ka absorption UV o ka cellulose i loaʻa.
Ua kokoke loa ke ki'i spectral i loa'a i ka'eneke spectral absorption ultraviolet o blank potassium permanganate, e hō'ike ana he ma'ema'e ka cellulose i loa'a.na X
Ua hōʻike ʻo X-ray diffraction analysis i ka hoʻomaikaʻi nui ʻana o ka crystallinity pili o ka cellulose huahana i loaʻa.
2. Ka hoʻomākaukauʻana i nā cellulose ethers
(1) Ua hoʻohana ʻia ka hoʻokolohua kumu hoʻokahi no ka hoʻomaʻamaʻa ʻana i ke kaʻina hana pretreatment alkali decristallization o pine cellulose;
Ua hoʻokō ʻia nā hoʻokolohua Orthogonal a me nā hoʻokolohua hoʻokahi-factor i ka hoʻomākaukau ʻana o CMC, HEC a me HECMC mai ka lāʻau paina alkali cellulose, kēlā me kēia.
hoʻopono.Ma lalo o nā kaʻina hana hoʻomākaukau maikaʻi loa, ua loaʻa iā CMC me DS a hiki i 1.237, HEC me MS a hiki i 1.657.
a me HECMC me kahi DS o 0.869.(2) Wahi a ka FTIR analysis, i hoʻohālikelike ʻia me ka cellulose lāʻau pine maoli, ua hoʻokomo maikaʻi ʻia ka carboxymethyl i loko o ka cellulose ether CMC.
I loko o ka cellulose ether HEC, ua pili pono ka hui hydroxyethyl;i ka cellulose ether HECMC, ua pili pono ka hui hydroxyethyl
ʻO nā hui carboxymethyl a me hydroxyethyl.
(3) Hiki ke loaʻa mai ka H-NMR analysis i hoʻokomo ʻia ka hui hydroxyethyl i ka huahana HEC, a loaʻa iā HEC ma ka helu maʻalahi.
degere mola o ka pani.
(4) E like me ka hoʻohālikelike XRD, i hoʻohālikelike ʻia me ka cellulose lāʻau pine maoli, ʻo ka cellulose ethers CMC, HEC a me HEECMC he
Ua hoʻololi ʻia nā ʻano aniani i ke ʻano cellulose II, a ua emi nui ka crystallinity.
3. Ka hoʻohana ʻana i ka cellulose ether paste
(1) ʻO nā waiwai kumu o ka paʻi kumu: SA, CMC, HEC a me HECMC he mau wai pseudoplastic āpau, a
ʻOi aku ka maikaʻi o ka pseudoplasticity o nā cellulose ethers ʻekolu ma mua o ka SA, a ke hoʻohālikelike ʻia me SA, he haʻahaʻa haʻahaʻa PVI, ʻoi aku ka maikaʻi no ka paʻi ʻana i nā hiʻohiʻona maikaʻi.
Pua;ʻO ka hoʻonohonoho ʻana o ka helu hoʻokumu ʻana o nā pāpaʻi ʻehā: SA > CMC > HECMC > HEC;ka paʻa wai o ka paʻi kumu CMC,
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ʻO ka hoʻohālikelike ʻana o ka urea a me ka paʻakai anti-staining S ua like ia me SA, a ʻoi aku ka maikaʻi o ka mālama ʻana o ka paʻi kumu CMC ma mua o SA, akā ʻo ka
ʻOi aku ka maikaʻi o ka hoʻohālikelike ʻana o HEC raw paste ma mua o ka SA;
ʻOi aku ka hewa o ka paʻa ʻana a me ka mālama ʻana o ka sodium bicarbonate ma mua o SA;
Ua like ka SA, akā ʻoi aku ka haʻahaʻa o ka paʻa wai, ka hoʻohālikelike me ka sodium bicarbonate a me ka paʻa o ka mālama ʻana o HEECMC raw paste ma mua o SA.(2) Paʻi ʻana o ka paʻi: CMC ʻike ʻia ka waihoʻoluʻu a me ka permeability, ka paʻi ʻana, ka paʻi kala kala, a pēlā aku e like me SA.
a ʻoi aku ka maikaʻi o ka depaste rate o CMC ma mua o ka SA;ua like ka depaste rate a me ka paʻi ʻana o HEC me SA, akā ʻoi aku ka maikaʻi o ka helehelena o HEC ma mua o ko SA.
ʻOi aku ka liʻiliʻi o ka nui o ka waihoʻoluʻu, permeability a me ka wikiwiki o ka waihoʻoluʻu ma mua o SA;ʻO ka manaʻo paʻi HECMC, ka wikiwiki o ka waihoʻoluʻu i ka hamo ʻana e like me SA;
ʻOi aku ka kiʻekiʻe o ka lākiō paʻi ma mua o SA, akā ʻoi aku ka haʻahaʻa o ka waihoʻoluʻu a me ka mālama ʻana o HECMC ma mua o SA.
5.2 Manaʻo
Mai ka hopena noi o 5.1 cellulose ether paste hiki ke loaʻa, cellulose ether paste hiki ke hoʻohana i ka hana.
Nā pāpaʻi paʻi kiʻi, ʻoi aku ka anionic cellulose ethers.Ma muli o ka hoʻokomo ʻana o ka hui hydrophilic carboxymethyl, nā lālā ʻeono
ʻO ka hoʻoulu ʻana o ka pūʻulu hydroxyl mua ma ke apo, a me ka hoʻopiʻi maikaʻi ʻole ma hope o ka ionization i ka manawa like, hiki ke hoʻoikaika i ke kala ʻana o nā fiber me nā dyes reactive.Eia naʻe, ma ka holoʻokoʻa,
ʻAʻole maikaʻi loa ka hopena noi o ka paʻi paʻi cellulose ether, ma muli o ke ʻano o ka hoʻololi ʻana a i ʻole ka molar substitution o cellulose ether.
Ma muli o ka haʻahaʻa haʻahaʻa o ka hoʻololi ʻana, pono e aʻo hou ka hoʻomākaukau ʻana i nā cellulose ethers me ke degere pani kiʻekiʻe.
Ka manawa kau: Oct-08-2022