Pehea ka hana ʻana o Hydroxypropyl Methylcellulose (HPMC)?

ʻO ka Hydroxypropyl methylcellulose (HPMC) he polymer wai-soluble semi-synthetic i hoʻohana mau ʻia i ka lāʻau lapaʻau, kūkulu hale a me nā ʻoihana meaʻai, a me nā mea ʻē aʻe. Loaʻa ia mai ka cellulose, he polymer maoli i loaʻa i loko o nā paia o nā mea kanu. Eia ka ʻike nui o ke kaʻina hana HPMC:

Ke kumu o ka cellulose:

ʻO ka mea nui no ka hana HPMC he cellulose, hiki ke loaʻa mai ka pulp lāʻau a i ʻole nā ​​lints pulupulu. ʻO ka pulp lāʻau kahi kumu maʻamau no ka mea he nui a he kumu kūʻai.

Lapaʻau alkali:

Hoʻohana ʻia ka cellulose me kahi alkali (maʻamau ka sodium hydroxide) e wehe i nā haumia a me ka hemicellulose. ʻO kēia kaʻina hana, i kapa ʻia ʻo mercerization, hana i ka cellulose maʻemaʻe.

Etherification:

Hoʻokomo ʻia ka cellulose i hoʻomaʻemaʻe ʻia i ka etherification, kahi hopena kemika e hoʻokomo i nā hui ether i loko o ka iwi kuamoʻo cellulose. No HPMC, hoʻokomo ʻia nā pūʻulu hydroxypropyl a me methyl i ka mole cellulose.

Hydroxypropylation:

Hoʻohana ʻia ka propylene oxide e hoʻokomo i nā pūʻulu hydroxypropyl i loko o ka cellulose. Hoʻopili kēia ʻanuʻu i ka hopena o propylene oxide a me cellulose i mua o kahi catalyst.

Methylation:

Hoʻokomo ʻia nā hui methyl i loko o ka cellulose hydroxypropylated me ka hoʻohana ʻana i ka methyl chloride a i ʻole dimethyl sulfate. Kapa ʻia kēia ʻanuʻu he methylation.

Hoʻopau a holoi ʻana:

Ma hope o ka hopena etherification, hoʻokaʻawale ʻia ka huahana e wehe i kahi kumu i koe. Holoi ʻia ka HPMC i ka hopena no ka wehe ʻana i nā huahana a me nā kemika i hana ʻole ʻia.

hoʻomaloʻo:

ʻO ka hana hope ka hoʻomaloʻo ʻana i ka HPMC no ka wehe ʻana i ka wai nui a loaʻa ka huahana i makemake ʻia ma ka pauka a i ʻole ke ʻano granular.

He mea nui e hoʻomaopopo he ʻokoʻa paha nā kikoʻī kikoʻī o ke kaʻina hana ma waena o nā mea hana, a hiki iā lākou ke hoʻohana i nā kūlana like ʻole, catalysts, a me nā reagents e hoʻokō i ka hana i makemake ʻia o HPMC. Hoʻohui ʻia, hoʻokō ʻia nā ana hoʻomalu maikaʻi i loko o ke kaʻina hana e hōʻoia i ka kūlike a me ka maʻemaʻe o ka huahana hope.