Kaʻina hana no ka hana ʻana i ka methyl cellulose ether

ʻO ka hana ʻana omethyl cellulose etherpili i ka hoʻololi kemika o ka cellulose ma o ka etherification reactions. ʻO Methyl cellulose (MC) kahi wai-soluble cellulose ether i hoʻohana nui ʻia i nā ʻoihana like ʻole. Eia ka ʻike nui o ke kaʻina hana no ka hana ʻana i ka methyl cellulose ether:

1. Ke koho ʻana i ke kumu cellulose:

• Hoʻomaka ke kaʻina hana me ke koho ʻana i kahi kumu cellulose, maʻamau i loaʻa mai ka pulp lāʻau a i ʻole ka pulupulu. Ua koho ʻia ke kumu cellulose ma muli o nā ʻano i makemake ʻia o ka huahana methyl cellulose hope loa.

2. Pulping:

• ʻO ke kumu cellulose i koho ʻia e hana i ka pulping, kahi kaʻina e wāwahi ai i nā fibers i kahi ʻano maʻalahi. Hiki ke hoʻokō ʻia ka pulupulu ma o nā ʻano mechanical a i ʻole kemika.

3. Ho'ā 'ana o Cellulose:

• Hoʻohana ʻia ka cellulose pulped ma o ka mālama ʻana me kahi hopena alkaline. Ke manaʻo nei kēia ʻanuʻu e pehu i nā fiber cellulose, e hoʻoikaika hou iā lākou i ka wā o ka hopena etherification.

4. Etherification Reaction:

• Hoʻokomo ʻia ka cellulose i hana ʻia i ka etherification, kahi e hoʻokomo ʻia ai nā hui ether, i kēia hihia, nā hui methyl, i nā pūʻulu hydroxyl ma ke kaulahao polymer cellulose.
• ʻO ka hopena etherification e pili ana i ka hoʻohana ʻana i nā mea methylating e like me ka sodium hydroxide a me ka methyl chloride a i ʻole dimethyl sulfate. ʻO nā kūlana hopena, me ka mahana, ke kaomi, a me ka manawa pane, mālama pono ʻia no ka loaʻa ʻana o ke degere o ka hoʻololi ʻana (DS).

5. Neutralization a holoi:

• Ma hope o ka hopena etherification, hoʻokaʻawale ʻia ka huahana e wehe i ka alkali nui. Lawe ʻia nā ʻanuʻu holoi ma hope e hoʻopau i nā koena kemika a me nā haumia.

6. Hoʻomaloʻo:

• Hoʻomaloʻo ʻia ka cellulose hoʻomaʻemaʻe a me ka methylated e loaʻa ai ka huahana methyl cellulose ether hope ma ke ʻano o ka pauka a i ʻole granules.

7. 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. ʻO ke kiʻekiʻe o ka hoʻololi ʻana (DS) kahi ʻāpana koʻikoʻi i nānā ʻia i ka wā hana.

8. Hoʻokumu a me ka Packaging:

• Hoʻokumu ʻia ka methyl cellulose ether i nā māka like ʻole e hoʻokō i nā koi kikoʻī o nā noi like ʻole. Hiki ke ʻokoʻa nā māka like ʻole i ko lākou viscosity, ka nui o nā ʻāpana, a me nā waiwai ʻē aʻe.
• Hoʻopili ʻia nā huahana hope no ka hāʻawi ʻana.

He mea nui e hoʻomaopopo he ʻokoʻa nā kūlana kikoʻī a me nā reagents i hoʻohana ʻia i ka hopena etherification e pili ana i nā kaʻina hana pono a ka mea hana a me nā waiwai i makemake ʻia o ka huahana methyl cellulose. Loaʻa ka Methyl cellulose i nā noi i ka ʻoihana meaʻai, nā lāʻau lapaʻau, ke kūkulu ʻana, a me nā ʻāpana ʻē aʻe ma muli o kona hiki ke hoʻoheheʻe wai a me ka hana kiʻiʻoniʻoni.