Ka hoʻomākaukau ʻana i nā cellulose ethers

Ka hoomakaukau ana ocellulose etherse pili ana i ka hoʻololi kemika i ka cellulose polymer maoli ma o nā hopena etherification. Hoʻokomo kēia kaʻina hana i nā pūʻulu ether i nā pūʻulu hydroxyl o ke kaulahao polymer cellulose, e alakaʻi ana i ka hoʻokumu ʻana i nā cellulose ethers me nā waiwai kūʻokoʻa. ʻO nā ethers cellulose maʻamau ka Hydroxypropyl Methylcellulose (HPMC), Carboxymethyl Cellulose (CMC), Hydroxyethyl Cellulose (HEC), Methyl Cellulose (MC), a me Ethyl Cellulose (EC). Eia ka ʻike nui o ke kaʻina hana hoʻomākaukau:

1. ʻO ke kiʻi ʻana o ka cellulose:

• Hoʻomaka ke kaʻina hana me ka hoʻoulu ʻana i ka cellulose, ka mea maʻamau i loaʻa mai ka pulp lāʻau a i ʻole ka pulupulu. Hiki i ke koho o ke kumu cellulose ke hoʻololi i nā waiwai o ka huahana cellulose ether hope loa.

2. Pulping:

• Hoʻokomo ʻia ka cellulose i nā kaʻina pulping e wāwahi i nā fibers i kahi ʻano maʻalahi. Hiki i kēia ke komo i nā ʻano pulping mechanical a i ʻole kemika.

3. Hoomaemae:

• Hoʻomaʻemaʻe ʻia ka cellulose e wehe i nā haumia, lignin, a me nā mea ʻole cellulosic ʻē aʻe. He mea koʻikoʻi kēia hana hoʻomaʻemaʻe i ka loaʻa ʻana o kahi mea cellulose kiʻekiʻe.

4. Etherification Reaction:

• ʻO ka cellulose i hoʻomaʻemaʻeʻia e hana i ka etherification, kahi i hoʻokomoʻia ai nā hui ether i nā hui hydroxyl ma ke kaulahao polymer cellulose. ʻO ke koho ʻana o ka mea etherifying a me nā ʻano hopena e pili ana i ka huahana cellulose ether makemake.
• ʻO nā mea etherifying maʻamau ka ethylene oxide, propylene oxide, sodium chloroacetate, methyl chloride, a me nā mea ʻē aʻe.

5. Ka hoomalu ana i na palena pane:

• Hoʻoponopono maikaʻi ʻia ka hopena etherification ma ke ʻano o ka mahana, ke kaomi, a me ka pH e hoʻokō i ke kiʻekiʻe makemake o ka hoʻololi ʻana (DS) a pale i nā hopena ʻaoʻao.
• Hoʻohana pinepine ʻia nā kūlana alkaline, a nānā pono ʻia ka pH o ka hui ʻana.

6. Neutralization a me ka holoi 'ana:

• Ma hope o ka hopena etherification, hoʻopau pinepine ʻia ka huahana e wehe i nā reagents a i ʻole nā ​​​​huahana. Hoʻopau ʻia kēia ʻanuʻu me ka holoi ʻana 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 no ka hoʻokele maikaʻi ʻana, me ka spectroscopy nuclear magnetic resonance (NMR), spectroscopy Fourier-transform infrared (FTIR), a me ka chromatography.
• ʻO ke kiʻekiʻe o ka hoʻololi ʻana (DS) kahi ʻāpana koʻikoʻi i nānā ʻia i ka wā hana e hōʻoia i ka kūlike.

9. Hoʻokumu a me ka Packaging:

• Hoʻokumu ʻia ka cellulose ether i nā māka like ʻole e hoʻokō i nā koi kikoʻī o nā noi like ʻole. Hoʻopili ʻia nā huahana hope no ka hāʻawi ʻana.

ʻO ka hoʻomākaukau ʻana i nā cellulose ethers he kaʻina kemika paʻakikī e pono ai ka mālama pono ʻana i nā kūlana hopena e hoʻokō ai i nā waiwai i makemake ʻia. Hiki i ka versatility o cellulose ethers ke hoʻohana i ka nui o nā noi ma waena o nā ʻoihana, me nā lāʻau lapaʻau, nā meaʻai, ke kūkulu ʻana, nā uhi, a me nā mea hou aku.