ʻO ka Methylcellulose ka pauka keʻokeʻo a i ʻole keʻokeʻo keʻokeʻo; ʻala ʻole a ʻono ʻole. Huhu kēia huahana i loko o kahi ʻano colloidal maʻemaʻe a liʻiliʻi paha i loko o ka wai; ʻaʻole hiki ke hoʻoheheʻe ʻia i loko o ka ethanol piha, chloroform a i ʻole etera. E hoʻopuehu wikiwiki a pehu i loko o ka wai wela ma 80-90 ° C, a hoʻoheheʻe koke ma hope o ka hoʻomaha ʻana. Paʻa loa ka hopena wai ma ka lumi wela, a hiki ke gel i ka wela kiʻekiʻe, a hiki ke loli ka gel me ka hopena me ka mahana.
He maikaʻi loa ka wettability, dispersibility, adhesiveness, thickening, emulsification, paʻa wai a me nā waiwai hana kiʻiʻoniʻoni, a me ka impermeability i ka aila. ʻO ke kiʻiʻoniʻoni i hoʻokumu ʻia he ʻoi aku ka paʻakikī, ka maʻalahi a me ka ʻike. No ka mea he non-ionic, hiki ke hoʻohālikelike me nā emulsifiers ʻē aʻe, akā maʻalahi ka paʻakai, a paʻa ka hopena i ka laulā o PH2-12. ʻO Sodium Carboxymethyl Cellulose ʻO kēia huahana ka paʻakai sodium o cellulose carboxymethyl ether, ʻo ia ka anionic cellulose ether, keʻokeʻo a i ʻole milky keʻokeʻo fibrous pauka a i ʻole granules, me ka nui o 0.5-0.7 g / cm3, aneane ʻole a ʻono ʻole, me ka hygroscopicity. Hoʻopuehu maʻalahi i loko o ka wai e hana i kahi hopena colloidal akaka, hiki ʻole ke hoʻoheheʻe ʻia i loko o nā mea hoʻoheheʻe kūlohelohe e like me ka ethanol.
ʻO ka pH o ka hopena wai he 6.5-8.5. Aia ka pH> 10 a i ʻole <5, e hoʻemi nui ʻia ka viscosity o ke kāpili, a ʻoi aku ka maikaʻi o ka hana i ka pH 7. Paʻa i ka wela, piʻi wikiwiki ka viscosity ma lalo o 20 ° C, a loli mālie i 45. °C. ʻO ka hoʻomehana lōʻihi ma luna o 80 ° C hiki ke denature i ka colloid a hoʻemi nui i ka viscosity a me ka hana. Hiki ke hoʻoheheʻe ʻia i loko o ka wai, a maopopo ka hopena; He paʻa loa ia i ka hopena alkaline, akā hiki ke hoʻoheheʻe ʻia i ka wā e hālāwai ai me ka waika, a e hoʻoheheʻe ʻia i ka wā o ka pH waiwai he 2-3, a e hana pū me nā paʻakai metala polyvalent. ʻO Hydroxypropyl methylcellulose, ka mea i ʻike ʻia he hypromellose a me ka cellulose hydroxypropyl methyl ether, i hana ʻia me ka cellulose pulupulu maʻemaʻe ma ke ʻano he mea maka, kahi i hoʻokaʻawale ʻia ma lalo o nā kūlana alkaline.
Hiki ke hoʻoheheʻe ʻia i ka wai a me ka nui o ka polar c a me nā ʻāpana kūpono o ka ethanol/wai, propanol/wai, dichloroethane, etc., hiki ʻole ke hoʻoheheʻe ʻia i ka etera, acetone, ethanol piha, a pehu ʻia i loko o kahi colloid akaka a ʻeleʻele paha i loko o ka wai anuanu. Loaʻa i ka hoʻonā wai i ka hana ʻili, ke ʻike kiʻekiʻe a me ka hana paʻa. Loaʻa i ka HPMC ka waiwai o ka thermal gelation. Hoʻomaʻamaʻa ʻia ka hopena wai wai e hana i kahi gel a hoʻoheheʻe ʻia, a laila hoʻoheheʻe ʻia ma hope o ka hoʻoilo. ʻOkoʻa ka mahana gelation o nā kikoʻī like ʻole.
Ka manawa hoʻouna: Feb-24-2023