Cellulose ethers a me ke ʻano o ka hana ʻana i ia mea

ʻO ka hana ʻana ocellulose etherse pili ana i nā hoʻololi kemika i ka cellulose, e loaʻa ana i nā derivatives me nā waiwai kūʻokoʻa. Eia ka ʻike maʻamau o nā ʻano hana i hoʻohana ʻia no ka hana ʻana i nā cellulose ethers:

1. Ke koho ʻana i ke kumu cellulose:

• Hiki ke kiʻi ʻia nā cellulose ethers mai nā kumu like ʻole e like me ka pulp lāʻau, nā linters pulupulu, a i ʻole nā ​​​​mea kanu ʻē aʻe. Hiki i ke koho o ke kumu cellulose ke hoʻopili i nā ʻano o ka huahana cellulose ether hope loa.

2. Pulping:

• Hoʻopau ke kumu cellulose i ka pulping e wāwahi i nā fibers i kahi ʻano maʻalahi. Hiki ke hoʻokō ʻia ka pulupulu ma o ka mechanical, chemical, a i ʻole ka hui pū ʻana o nā ʻano ʻelua.

3. Hoomaemae:

• Hoʻokomo ʻia ka cellulose pulped i nā kaʻina hoʻomaʻemaʻe e wehe i nā haumia, lignin, a me nā mea ʻole cellulosic ʻē aʻe. Pono ka hoʻomaʻemaʻe no ka loaʻa ʻana o kahi mea cellulose kiʻekiʻe.

4. Ho'ā 'ana o Cellulose:

• Hoʻohana ʻia ka cellulose i hoʻomaʻemaʻe ʻia e ka pehu ʻana i loko o kahi hopena alkaline. He mea koʻikoʻi kēia ʻanuʻu no ka hana hou ʻana o ka cellulose i ka wā o ka hopena etherification.

5. Etherification Reaction:

• Hoʻokomo ʻia ka cellulose i ka etherification, kahi e hoʻokomo ʻia ai nā hui ether i nā pūʻulu hydroxyl ma ke kaulahao polymer cellulose. ʻO nā mea etherifying maʻamau ka ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, a me nā mea ʻē aʻe.
• Hana ʻia ka hopena ma lalo o nā kūlana i hoʻomalu ʻia o ka wela, ke kaomi, a me ka pH no ka loaʻa ʻana o ke degere o ka hoʻololi ʻana (DS) i makemake ʻia a e pale aku i nā hopena ʻaoʻao.

6. Hoʻopau a me ka holoi ʻana:

• Ma hope o ka hopena etherification, hoʻopau pinepine ʻia ka huahana e wehe i nā reagents a i ʻole nā ​​​​huahana. Hana ʻia nā ʻanuʻu holoi e hoʻopau i nā koena kemika a me nā haumia.

7. Hoʻomaloʻo:

• Hoʻomaloʻo ʻia ka cellulose i hoʻomaʻemaʻe ʻia a hoʻomaʻemaʻe ʻia no ka loaʻa ʻana o ka huahana cellulose ether hope i loko o ka pauka a i ʻole ke ʻano granular.

8. Mana maikaʻi:

• Hoʻohana ʻia nā ʻano loiloi like ʻole, me ka spectroscopy nuclear magnetic resonance (NMR), spectroscopy Fourier-transform infrared (FTIR), a me chromatography, no ka hoʻokele maikaʻi. Nānā pono ʻia ka DS e hōʻoia i ka paʻa.

9. Hoʻokumu a me ka hoʻohana ʻana:

• Hoʻokumu ʻia ka cellulose ether i nā māka like ʻole e hoʻokō i nā koi kikoʻī o nā noi like ʻole. Ua kūpono nā ʻano cellulose ethers no nā ʻoihana like ʻole, e like me ke kūkulu ʻana, nā lāʻau lapaʻau, nā meaʻai, nā uhi, a me nā mea hou aku.

He mea nui e hoʻomaopopo he ʻokoʻa paha nā ʻano kikoʻī a me nā kūlana e pili ana i ka huahana cellulose ether makemake a me ka noi i manaʻo ʻia. Hoʻohana pinepine nā mea hana i nā hana proprietary e hana i nā cellulose ethers me nā waiwai kikoʻī i hoʻohālikelike ʻia e hoʻokō i nā pono o nā ʻoihana like ʻole.