Focus on Cellulose ethers

Hoʻololi i nā mea o ka lawe māmā ʻana o Hydroxypropyl Methyl Cellulose

ʻAʻole hiki i ka hydroxypropyl methylcellulose viscosity kiʻekiʻe ke hoʻohua i ka cellulose kiʻekiʻe loa ma ka hoʻoheheʻe ʻana a me ka hoʻololi ʻana o ka nitrogen i ka hana. ʻO ka maʻamau, ʻaʻole hiki ke kāohi ʻia ka hana ʻana o ka cellulose kiʻekiʻe-viscosity ma Kina. Eia nō naʻe, inā hiki ke hoʻokomo ʻia kahi mea ana o ka oxygen i loko o ka ipu hao, hiki ke hoʻomalu ʻia ka hana ʻana o kona viscosity. Eia kekahi, e noʻonoʻo ana i ka wikiwiki o ka hoʻololi ʻana o ka nitrogen, maʻalahi ka hana ʻana i nā huahana kiʻekiʻe-viscosity ʻoiai ke ʻano o ka airtight o ka ʻōnaehana. ʻOiaʻiʻo, koʻikoʻi nō hoʻi ka pae o ka polymerization o ka pulupulu hoʻomaʻemaʻe. Inā ʻaʻole pono kēlā, a laila e hana me ka hui hydrophobic. Aia nā luna hui ma kēia wahi ma Kina. ʻO ke ʻano o ka ʻoihana hui e koho ai he mana nui i ka hana o ka huahana hope.

ʻO ka māmā māmā o ka hydroxypropyl methylcellulose e hoʻopili nui ʻia e nā mea aʻe:

1. ʻO ka maikaʻi o nā mea maka.

2. Ka hopena o ka alkalization.

3. Lakiō kaʻina hana.

4. Ka lakio o na solvents.

5. Ka hopena hoʻoemi.

ʻO ke koena oxygen i loko o ka paila e hoʻohaʻahaʻa i ka cellulose a me ka hoʻohaʻahaʻa ʻana i ke kaumaha o ka molekala, akā ua kaupalena ʻia ke koena o ka oxygen, inā e hoʻopili wale i nā molekala pōʻino, e maʻalahi ka viscosity kiʻekiʻe. Eia nō naʻe, he pilina ikaika ka pae o ka wai momona me ka pae o ka hydroxyproline. Makemake wale kekahi mau hale hana e hoʻemi i ke kumukūʻai a me ke kumukūʻai, ʻaʻole makemake e hoʻonui i ka ʻike o ka hydroxyproline i ʻole ka maikaʻi ma mua o ka pae o nā huahana i hana ʻia ma waho. ʻO ka pae palekana o ka huahana e pili ana i ka phenol wai, akā ma ka laulā, ʻo ke kaʻina hana e hoʻoholo ai i kona degere mālama, ka ratio o ka alkali, methyl chloride a me propylene oxide, ke ʻano o ka alkali a me ka ratio o ka wai a me ka pulupulu e hoʻoholo i kāna hana. .


Ka manawa hoʻouna: Apr-23-2023
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