He aha nā māka ʻokoʻa o ka HPMC?

ʻO ka Hydroxypropyl methylcellulose (HPMC) he polymer versatile i hoʻohana ʻia i nā ʻano ʻoihana like ʻole me nā lāʻau lapaʻau, kūkulu hale, meaʻai, a me nā mea hoʻonaninani. He cellulose derivative ia e hōʻike ana i nā ʻano waiwai e pili ana i kāna papa kikoʻī. Hoʻokaʻawale ʻia nā māka like ʻole o ka HPMC e ko lākou viscosity, degere o ka hoʻololi ʻana, ka nui o ka ʻāpana, a me ke kumu noi kikoʻī.

1. Papa Viscosity
ʻO ka Viscosity kahi ʻāpana koʻikoʻi e wehewehe i ka pae o HPMC. E pili ana i ka mānoanoa a i ʻole ke kūʻē ʻana i ke kahe o kahi hopena HPMC. Loaʻa i ka HPMC ka laulā viscosity mai ka haʻahaʻa a hiki i ke kiʻekiʻe a maʻamau ke ana ʻia i ke centipoise (cP) ke hoʻoheheʻe ʻia i ka wai. Aia kekahi mau māka viscosity maʻamau:

Nā māka viscosity haʻahaʻa (e laʻa, 3 a 50 cP): Hoʻohana ʻia kēia mau māka i nā noi e koi ana i nā hāʻina viscosity haʻahaʻa, e like me ka ʻoihana meaʻai e like me nā stabilizers, thickeners, a i ʻole emulsifiers.

Nā māka viscosity liʻiliʻi (e laʻa, 100 a i 4000 cP): Hoʻohana ʻia ka HPMC ʻoʻoleʻa haʻahaʻa i ka hoʻokuʻu ʻia ʻana o nā lāʻau lapaʻau a me nā mea hoʻopaʻa i ka hana papa.

Nā māka viscosity kiʻekiʻe (e laʻa, 10,000 a i 100,000 cP): Hoʻohana pinepine ʻia nā māka viscosity kiʻekiʻe i ke kūkulu ʻana, ʻo ia hoʻi nā mortar sima, adhesives, a me nā plasters, kahi e hoʻomaikaʻi ai i ka hana, paʻa wai, a hoʻopili.

2. Degree of Substitution (DS) and Molar Substitution (MS)
ʻO ka degere o ka hoʻololi ʻana e pili ana i ka helu awelika o nā pūʻulu hydroxyl ma ka mole cellulose i pani ʻia e nā pūʻulu methoxy (-OCH3) a i ʻole hydroxypropyl (-OCH2CHOHCH3). Hoʻopili ka degere o ka hoʻololi ʻana i ka solubility, ka mahana gelation, a me ka viscosity o HPMC. Hoʻokaʻawale ʻia nā māka HPMC ma muli o ka methoxy a me ka hydroxypropyl content:

ʻO ka maʻiʻo methoxy (28-30%): ʻO ka maʻiʻo methoxy kiʻekiʻe ka hopena i ka haʻahaʻa haʻahaʻa o ka gelation a me nā viscosity kiʻekiʻe.

Hydroxypropyl content (7-12%): ʻO ka hoʻonui ʻana i ka ʻike hydroxypropyl e hoʻomaikaʻi maʻamau i ka solubility i ka wai anuanu a hoʻonui i ka maʻalahi.

3. Puunaue ka nui o ka ʻāpana
Hiki ke ʻano like ʻole ka nui o nā pauka HPMC, e pili ana i kā lākou hoʻoheheʻe ʻana a me ka hana ʻana i kahi noi. ʻO ka ʻoi aku ka maikaʻi o nā ʻāpana, ʻoi aku ka wikiwiki o ka hoʻoheheʻe ʻana, e kūpono iā lākou no nā noi e koi ai i ka hydration wikiwiki, e like me ka ʻoihana meaʻai. I ke kūkulu ʻana, ʻoi aku ka maikaʻi o ka hoʻohana ʻana i nā māka coarser no ka hoʻopuehu maikaʻi ʻana i nā hui maloʻo.

4. Nā māka noi kikoʻī
Loaʻa ka HPMC i nā māka like ʻole, i hoʻohālikelike ʻia i nā pono ʻoihana kūikawā:

Papa lāʻau lapaʻau: Hoʻohana ʻia ma ke ʻano he mea hoʻopaʻa, kiʻiʻoniʻoni mua, a me ka mea hoʻokuʻu hoʻokuʻu ʻia i nā ʻano mea paʻa paʻa waha. Hoʻokō ia i nā kūlana hoʻomaʻemaʻe koʻikoʻi a loaʻa i ka viscosity kikoʻī a me nā waiwai pani.

Papa hana: Hoʻohana ʻia kēia māka o HPMC no ka hoʻohana ʻana i nā huahana sima a me nā huahana gypsum. Hoʻomaikaʻi ia i ka mālama ʻana i ka wai, ka hana, a me ka hoʻopili ʻana i nā plasters, mortars, a me nā mea hoʻopili tile. Hoʻohana mau ʻia nā māka viscosity kiʻekiʻe ma kēia wahi.

Papa meaʻai: Ua ʻae ʻia ka HPMC meaʻai no ka hoʻohana ʻana ma ke ʻano he mea hoʻohui meaʻai (E464) a hiki ke hoʻohana ʻia ma ke ʻano he mānoanoa, emulsifier, a me ka stabilizer i nā ʻano huahana like ʻole, me nā mea i kālua ʻia a me nā mea pani waiu. Pono ia e hoʻokō me nā kānāwai palekana meaʻai a he haʻahaʻa loa i nā haumia.

Maikaʻi: Ma nā huahana mālama pilikino, hoʻohana ʻia ʻo HPMC ma ke ʻano he mānoanoa, emulsifier, a me ke kiʻiʻoniʻoni mua. Hāʻawi ia i kahi ʻano maʻemaʻe i nā creams, lotions, a me nā shampoos.

5. Nā māka i hoʻololi ʻia
Pono kekahi mau noi i nā māka HPMC i hoʻololi ʻia, kahi i hoʻololi ʻia ka polymer e hoʻomaikaʻi i nā waiwai kikoʻī:

HPMC i hoʻopili ʻia: Hoʻomaikaʻi kēia hoʻololi i ka ikaika o ka gel a me ka paʻa i nā ʻano hoʻokuʻu hoʻokuʻu ʻia.

ʻO ka HPMC i hoʻololi ʻia Hydrophobic: Hoʻohana ʻia kēia ʻano HPMC i nā ʻano hana e koi ai i ka hoʻoikaika ʻana i ka wai, e like me nā uhi a me nā pena.

6. Nā māka wela gel
ʻO ka mahana gel o HPMC ka mahana kahi e hoʻomaka ai kahi hopena e hana i kahi gel. Pili ia i ke ʻano o ka hoʻololi a me ka viscosity. Loaʻa nā māka like ʻole ma muli o ka mahana gel i makemake ʻia:

Nā māka wela gel haʻahaʻa: ʻO kēia mau māka gel i nā haʻahaʻa haʻahaʻa, e kūpono ana iā lākou no nā piʻi wela a i ʻole nā ​​​​kaʻina hana ʻoihana e pono ai nā hoʻonohonoho haʻahaʻa haʻahaʻa.

Nā māka wela gel kiʻekiʻe: Hoʻohana ʻia kēia i nā noi e koi ana i ka hoʻokumu ʻana i ka gel i nā mahana kiʻekiʻe, e like me kekahi mau lāʻau lapaʻau.

Loaʻa ka HPMC i nā papa like ʻole e hoʻokō i nā pono kikoʻī o nā ʻoihana like ʻole. ʻO ke koho ʻana o ka māka HPMC e pili ana i ka viscosity i makemake ʻia, ke degere o ka hoʻololi ʻana, ka nui o ka ʻāpana, a me nā koi noi kikoʻī. Inā hoʻohana ʻia i loko o nā lāʻau lapaʻau, kūkulu hale, meaʻai a mea hoʻonaninani paha, ʻo ka māka kūpono o HPMC he mea koʻikoʻi e hoʻokō i nā waiwai i makemake ʻia a me nā hana i ka huahana hope.