Ke kaʻina hana no ka hana ʻana o ka methyl cellulose ether

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

1. Koho ʻana o ke kumu o ka Cellulose:

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

2. Ka hoʻopili ʻana i ka pulp:

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

3. Hoʻāla ʻia o Cellulose:

• A laila hoʻāla ʻia ka cellulose i pulped ʻia ma ka mālama ʻana iā ia me kahi hopena alkaline. ʻO ka pahuhopu o kēia kaʻina hana e pehu i nā olonā cellulose, e hoʻolilo iā lākou i mea pane hou i ka wā o ka hopena etherification ma hope.

4. Hana Etherification:

• Hoʻomaʻamaʻa ʻia ka cellulose i hoʻāla ʻia i ka etherification, kahi e hoʻokomo ʻia ai nā hui ether, ma kēia hihia, nā hui methyl, i nā hui 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. Hoʻomalu pono ʻia nā kūlana o ka hopena, me ka mahana, ke kaomi, a me ka manawa hopena, e hoʻokō i ke kekelē o ka pani ʻana (DS) i makemake ʻia.

5. Hoʻopau a me ka holoi ʻana:

• Ma hope o ka hopena etherification, hoʻopau ʻia ka huahana e wehe i ka alkali keu. Hana ʻia nā ʻanuʻu holoi ma hope e hoʻopau i nā kemika a me nā haumia i koe.

6. Hoʻomaloʻo:

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

7. Ka Mana Kūlana:

• Hoʻohana ʻia nā ʻano hana loiloi like ʻole, me ka spectroscopy magnetic resonance nuclear (NMR), ka spectroscopy Fourier-transform infrared (FTIR), a me ka chromatography, no ka kaohi ʻana i ka maikaʻi. ʻO ke kekelē o ka pani ʻana (DS) kahi palena koʻikoʻi i nānā ʻia i ka wā o ka hana ʻana.

8. Hoʻomākaukau a me ka hoʻopili ʻana:

• A laila ua hoʻohui ʻia ka methyl cellulose ether i nā papa like ʻole e hoʻokō ai i nā koi kikoʻī o nā noi like ʻole. Hiki ke ʻokoʻa nā papa like ʻole i ko lākou viscosity, ka nui o ka ʻāpana, a me nā waiwai ʻē aʻe.
• Hoʻopili ʻia nā huahana hope loa no ka hoʻolaha ʻana.

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