ʻO nā cellulose ethers nā mea maʻamau i hoʻohana ʻia i nā ʻano ʻoihana like ʻole me ke kūkulu ʻana, nā lāʻau lapaʻau a me nā meaʻai. ʻO ke kaʻina hana o ka cellulose ether he paʻakikī loa, pili i nā ʻanuʻu he nui, a koi i ka nui o ka loea a me nā lako kūikawā. Ma kēia ʻatikala, e kūkākūkā nui mākou i ke kaʻina hana o ka cellulose ethers.
ʻO ka hana mua i ka hana hana cellulose ether ka hoʻomākaukau ʻana i nā mea maka. ʻO nā mea maka i hoʻohana ʻia no ka hana ʻana i nā cellulose ethers maʻamau mai ka pulp lāʻau a me ka pulupulu ʻōpala. Hoʻopili ʻia ka pulp lāʻau a hoʻopaʻa ʻia e wehe i nā ʻōpala nui, ʻoiai ʻo ka ʻōpala pulupulu e hana ʻia i pulp maikaʻi. Hoʻemi ʻia ka nui o ka pulp ma ka wili ʻana a loaʻa kahi pauda maikaʻi. A laila hui pū ʻia ka pulupulu lāʻau pauka a me ka pulupulu ʻōpala i nā ʻāpana kikoʻī ma muli o nā waiwai i makemake ʻia o ka huahana hope.
ʻO ka ʻanuʻu aʻe e pili ana i ka hana kemika o ka meaʻai i hui ʻia. Hoʻomaʻamaʻa mua ʻia ka pulp me kahi solution alkaline (maʻamau ka sodium hydroxide) e wāwahi i ke ʻano fibrous o ka cellulose. A laila mālama ʻia ka cellulose me kahi mea hoʻoheheʻe e like me ka carbon disulfide e hana i ka cellulose xanthate. Hana ʻia kēia mālama ʻana i loko o nā pahu me ka hoʻolako mau ʻana o ka pulp. Hoʻokuʻu ʻia ka solution cellulose xanthate ma o kahi mea extrusion e hana i nā filament.
Ma hope, ua wili ʻia nā filament cellulose xanthate i loko o kahi ʻauʻau me ka waika sulfuric dilute. ʻO kēia ka hopena i ka hana hou ʻana o nā kaulahao cellulose xanthate, e hana ana i nā fiber cellulose. Holoi ʻia nā fiber cellulose hou me ka wai no ka wehe ʻana i nā haumia ma mua o ka bleached. Hoʻohana ke kaʻina bleaching i ka hydrogen peroxide e hoʻomaʻemaʻe i nā fiber cellulose, a laila holoi ʻia me ka wai a waiho ʻia e maloʻo.
Ma hope o ka maloʻo ʻana o ka cellulose fibers, hele lākou i kahi kaʻina i kapa ʻia etherification. ʻO ke kaʻina hana etherification e pili ana i ka hoʻokomo ʻana i nā pūʻulu ether, e like me methyl, ethyl a hydroxyethyl pūʻulu, i loko o nā fiber cellulose. Hoʻohana ʻia ke ʻano hana me ka hoʻohana ʻana i ka hopena o kahi mea etherification a me kahi catalyst acid i mua o kahi solvent. Hoʻokō pinepine ʻia nā hopena ma lalo o nā kūlana mālama ʻia o ka mahana a me ke kaomi e hōʻoia i nā hua kiʻekiʻe a me ka maʻemaʻe.
I kēia manawa, aia ka cellulose ether i ke ʻano o ka pauka keʻokeʻo. Hoʻopili ʻia ka huahana i hoʻopau ʻia i kahi ʻano o nā hoʻāʻo hoʻokele maikaʻi e hōʻoia i ka hoʻokō ʻana o ka huahana i nā makemake a me nā kikoʻī i makemake ʻia, e like me ka viscosity, ka maʻemaʻe o ka huahana a me ka ʻoluʻolu. Hoʻopili ʻia a hoʻouna ʻia i ka mea hoʻohana hope.
ʻO ka hōʻuluʻulu ʻana, ʻo ke kaʻina hana o ka cellulose ether e pili ana i ka hoʻomākaukau ʻana i nā mea maka, ka mālama kemika, ka milo, ka bleaching a me ka etherification, a ukali ʻia e ka hoʻāʻo ʻana i ka maikaʻi. Pono ke kaʻina holoʻokoʻa i nā mea hana kūikawā a me ka ʻike o nā hopena kemika a lawe ʻia ma lalo o nā kūlana hoʻomalu paʻa. ʻO ka hana ʻana i nā cellulose ethers he hana paʻakikī a hoʻopau manawa, akā pono i nā ʻoihana he nui.
Ka manawa hoʻouna: Iune-21-2023