ʻO Hydroxypropyl methylcellulose (inoa INN: Hypromellose), i hoʻomaʻalahi ʻia hoʻi e like me hypromellose (hydroxypropyl methylcellulose, i hoʻopōkole ʻia e like meHPMC), he ʻano ʻano nonionic cellulose i hui pū ʻia me nā ethers. He polymer semi-synthetic, hana ʻole, viscoelastic i hoʻohana pinepine ʻia ma ke ʻano he lubricant i ka ophthalmology, a i ʻole he excipient a excipient paha i nā lāʻau lapaʻau waha, a loaʻa pinepine ʻia i nā huahana kalepa like ʻole.
Ma ke ʻano he mea hoʻohui meaʻai, hiki i ka hypromellose ke hoʻokani i kēia mau hana: emulsifier, thickener, suspending agent a me kahi pani no ka gelatin holoholona. ʻO kāna code (E-code) ma ka Codex Alimentarius ʻo E464.
Nā waiwai kemika:
ʻO ka huahana i hoʻopau ʻia ohydroxypropyl methylcelluloseHe pauka keʻokeʻo a he paʻa fibrous keʻokeʻo wehe paha, a hele ka nui o ka ʻāpana ma o kahi sieve 80-mesh. ʻOkoʻa ka lakio o ka ʻike methoxyl i ka ʻike hydroxypropyl o ka huahana i hoʻopau ʻia, a ʻokoʻa ka viscosity, no laila lilo ia i ʻano like ʻole me nā hana like ʻole. Loaʻa iā ia nā ʻano o ka hiki ke hoʻoheheʻe ʻia i ka wai anuanu a me ka hiki ʻole ke hoʻoheheʻe ʻia i ka wai wela e like me ka methyl cellulose, a ʻoi aku kona solubility i nā solvents organik ma mua o ka wai. Hiki ke hoʻoheheʻe ʻia i loko o ka methanol anhydrous a me ka ethanol, a hiki ke hoʻoheheʻe ʻia i loko o nā hydrocarbons chlorinated e like me dichloro methane, trichloroethane, a me nā solvents organik e like me acetone, isopropanol, a me ka diacetone alcohol. Ke hoʻoheheʻe ʻia i loko o ka wai, e hui pū me nā mole wai e hana i kahi colloid. He paʻa ia i ka waikawa a me ka alkali, a ʻaʻole i hoʻopilikia ʻia i ka pae o pH = 2 ~ 12. ʻOiai ʻaʻole ʻawaʻawa ka Hypromellose, he lapalapa a pane ikaika me nā mea oxidizing.
Hoʻonui ka mānoanoa o nā huahana HPMC me ka hoʻonui ʻia o ka noʻonoʻo a me ke kaumaha molekala, a i ka piʻi ʻana o ka mahana, hoʻomaka ka emi ʻana o kona mānoanoa. Ke hiki i kahi mahana, piʻi koke ka mānoanoa a hana ʻia ka gelation. kiʻekiʻe o. Paʻa kona hopena wai ma ka mahana o ka lumi, koe wale nō hiki ke hoʻohaʻahaʻa ʻia e nā enzymes, a ʻaʻohe hanana degradation o kona mānoanoa maʻamau. Loaʻa iā ia nā waiwai gelation thermal kūikawā, nā waiwai hana kiʻiʻoniʻoni maikaʻi a me ka hana ʻili.
Ke hana ʻana:
Ma hope o ka mālama ʻia ʻana o ka cellulose me ka alkali, hiki i ka anion alkoxy i hana ʻia e ka deprotonation o ka hui hydroxyl ke hoʻohui i ka propylene oxide e hana i ka hydroxypropyl cellulose ether; hiki nō hoʻi iā ia ke hoʻopili me ka methyl chloride e hana i ka methyl cellulose ether. Hoʻopuka ʻia ka Hydroxypropyl methylcellulose ke hana ʻia nā hopena ʻelua i ka manawa like.
Ke hoʻohana nei:
Ua like ka hoʻohana ʻana o ka hydroxypropyl methylcellulose me nā ethers cellulose ʻē aʻe. Hoʻohana nui ʻia ia ma ke ʻano he mea hoʻolaha, mea hoʻokuʻu, mea hoʻomānoanoa, emulsifier, mea hoʻopaʻa a me ka mea hoʻopili ma nā ʻano like ʻole. ʻOi aku ka maikaʻi ma mua o nā ethers cellulose ʻē aʻe ma ke ʻano o ka solubility, dispersibility, transparency a me ke kūʻē ʻana i ka enzyme.
I ka ʻoihana meaʻai a me nā lāʻau lapaʻau, hoʻohana ʻia ia ma ke ʻano he mea hoʻohui. Hoʻohana ʻia ia ma ke ʻano he mea hoʻopili, mea hoʻomānoanoa, mea hoʻolaha, mea hoʻoluʻu, mea hoʻopaʻa a me ka emulsifier. ʻAʻohe ona ʻawahia, ʻaʻohe waiwai meaʻai, a ʻaʻohe loli metabolic.
Kahi mea hou aʻe,HPMCLoaʻa nā noi i ka polymerization resin synthetic, petrochemicals, ceramics, papermaking, ʻili, nā mea hoʻonani, nā uhi, nā mea kūkulu hale a me nā papa paʻi photosensitive.
Ka manawa hoʻouna: ʻApelila-25-2024