Hydroxypropyl methylcellulose (HPMC)he cellulose huikau ole i ka wai. He keʻokeʻo ka hiʻohiʻona a hiki i ka pauka melemele iki a i ʻole nā mea granular, ʻono ʻole, ʻala ʻole, ʻona ʻole, paʻa kemika, a hoʻoheheʻe ʻia i loko o ka wai e hana ai i kahi hopena maʻemaʻe, ʻikea a viscous. ʻO kekahi o nā waiwai koʻikoʻi o ka hydroxypropyl methylcellulose i ka noi ʻana ʻo ia ka mea e hoʻonui ai i ka viscosity o ka wai. ʻO ka hopena mānoanoa e pili ana i ke kiʻekiʻe o ka polymerization (DP) o ka huahana, ka neʻe ʻana o ka cellulose ether i loko o ka wai wai, ka nui o ka shear, a me ka mahana o ka hopena. A me nā kumu ʻē aʻe.
01
ʻAno wai o ka wai wai HPMC
Ma keʻano laulā, hiki ke hōʻike ʻia ke koʻikoʻi o kahi wai i ke kahe ʻana ma ke ʻano he hana o ka shear rate ƒ(γ) wale nō, ʻoiai ʻaʻole ia e hilinaʻi i ka manawa. Ma muli o keʻano o ƒ (γ), hiki ke hoʻokaʻawaleʻia nā wai i nāʻano likeʻole,ʻo ia hoʻi: Newtonian fluids, dilatant fluids, pseudoplastic fluids a me Bingham plastic fluids.
Hoʻokaʻawale ʻia nā cellulose ethers i ʻelua mau ʻāpana: hoʻokahi ka non-ionic cellulose ether a ʻo kekahi he ionic cellulose ether. No ka rheology o kēia mau ʻano cellulose ethers. SC Naik et al. Ua hana ʻia kahi haʻawina hoʻohālikelike piha a me ka ʻōnaehana ma ka hydroxyethyl cellulose a me ka sodium carboxymethyl cellulose solutions. Ua hōʻike ʻia nā hopena he pseudoplastic nā hopena cellulose ether non-ionic a me ka ionic cellulose ether solutions. ʻO nā kahe, ʻo ia hoʻi nā kahe ʻaʻole Newtonian, hoʻokokoke i nā wai Newtonian ma nā haʻahaʻa haʻahaʻa loa. ʻO ka pseudoplasticity o ka hydroxypropyl methylcellulose solution ka mea nui i ka noi. No ka laʻana, i ka wā i hoʻohana ʻia i loko o nā uhi, ma muli o nā hiʻohiʻona ʻili o ka wai, e emi ana ka viscosity o ka hopena me ka piʻi ʻana o ka shear rate, kahi e kūpono ai i ka hoʻopuehu like ʻana o nā ʻāpana puaʻa, a hoʻonui pū i ka wai o ka uhi. Nui loa ka hopena; ʻoiai e hoʻomaha ana, ʻoi aku ka nui o ka viscosity o ka hopena, kahi e pale pono ai i ka waiho ʻana o nā ʻāpana pigment i ka uhi.
02
ʻO ke ʻano hoʻāʻo ʻo HPMC Viscosity
ʻO kahi hōʻailona koʻikoʻi no ke ana ʻana i ka hopena mānoanoa o ka hydroxypropyl methylcellulose ʻo ia ka viscosity ʻike ʻia o ka hoʻonā wai. ʻO nā ʻano ana o ka viscosity ʻike pinepine ʻia ke ʻano capillary viscosity method, rotational viscosity method a me ka hāʻule ʻana o ka viscosity viscosity.
kahi: ka viscosity ikea, mPa s; ʻO K ka viscometer mau; d ka mānoanoa o ka hāpana hāpana ma 20/20°C; ʻo ka manawa e hele ai ka hopena ma ka ʻaoʻao o luna o ka viscometer a hiki i ka hōʻailona lalo, s; ʻO ka manawa e kahe ai ka ʻaila maʻamau ma o ka viscometer.
Eia naʻe, ʻoi aku ka pilikia o ke ʻano o ke ana ʻana me ka viscometer capillary. ʻO nā viscosity o nā mea he nuicellulose ethersHe paʻakikī ke kālailai ʻana me ka viscometer capillary no ka mea aia i loko o kēia mau haʻina ka nui o nā mea hiki ʻole ke ʻike ʻia ke kāohi ʻia ka viscometer capillary. No laila, hoʻohana ka hapa nui o nā mea hana i nā viscometer rotational e kāohi i ka maikaʻi o ka hydroxypropyl methylcellulose. Hoʻohana mau ʻia nā viscometers Brookfield ma nā ʻāina ʻē, a hoʻohana ʻia nā viscometers NDJ ma Kina.
03
ʻO nā kumu hoʻohālikelike o ka viscosity HPMC
3.1 Pili me ke degere o ka houluulu
Ke hoʻololi ʻole ʻia nā ʻāpana ʻē aʻe, ua kūlike ka viscosity o ka solution hydroxypropyl methylcellulose i ke degere o ka polymerization (DP) a i ʻole ke kaumaha molekala a i ʻole ka lōʻihi o ke kaulahao mole, a piʻi me ka piʻi ʻana o ke degere o ka polymerization. ʻOi aku ka maikaʻi o kēia hopena ma ke ʻano o ka polymerization haʻahaʻa ma mua o ke ʻano o ka polymerization kiʻekiʻe.
3.2 Ka pilina ma waena o ka viscosity a me ka ʻike
Hoʻonui ka viscosity o ka hydroxypropyl methylcellulose me ka piʻi ʻana o ka neʻe ʻana o ka huahana i loko o ka hopena wai. ʻO kahi hoʻololi hoʻololi liʻiliʻi e hoʻololi nui i ka viscosity. Me ka viscosity nominal o hydroxypropyl methylcellulose ʻO ka hopena o ka hoʻololi ʻana o ka hoʻonā hoʻonā i ka viscosity o ka hopena ʻoi aku ka ʻike.
3.3 Ka pilina ma waena o ka viscosity a me ka shear rate
ʻO ka hydroxypropyl methylcellulose aqueous solution ka waiwai o ka shear thinning. Hoʻomākaukau ʻia ʻo Hydroxypropyl methylcellulose o ka viscosity nominal like ʻole i 2% aqueous solution, a ua ana ʻia kona viscosity ma nā ʻāpana shear like ʻole. Penei na hopena E like me ka hoikeia ma ke kii. Ma ka haʻahaʻa shear rate, ʻaʻole i loli nui ka viscosity o ka hydroxypropyl methylcellulose solution. Me ka piʻi ʻana o ka shear rate, ʻoi aku ka emi o ka viscosity o ka hydroxypropyl methylcellulose solution me ka viscosity nominal kiʻekiʻe, ʻoiai ʻaʻole i emi maopopo ka hopena me ka viscosity haʻahaʻa.
3.4 Ka pilina ma waena o ka viscosity a me ka mahana
ʻO ka viscosity o ka hydroxypropyl methylcellulose solution ka hopena nui i ka mahana. Ke piʻi aʻe ka mahana, emi ka viscosity o ka hopena. E like me ka mea i hōʻike ʻia ma ke kiʻi, ua hoʻomākaukau ʻia i loko o kahi hopena wai me kahi ʻano o 2%, a ua ana ʻia ka loli o ka viscosity me ka piʻi ʻana o ka mahana.
3.5 Nā mea hoʻoikaika ʻē aʻe
Hoʻopili pū ʻia ka viscosity o ka wai wai o ka hydroxypropyl methylcellulose e nā mea hoʻohui i ka hopena, ka waiwai pH o ka hopena, a me ka hoʻohaʻahaʻa microbial. ʻO ka mea maʻamau, i mea e loaʻa ai ka maikaʻi o ka viscosity a i ʻole e hōʻemi i ke kumukūʻai o ka hoʻohana ʻana, pono e hoʻohui i nā mea hoʻololi rheology, e like me ka pālolo, ka pālolo i hoʻololi ʻia, ka pauka polymer, ka starch ether a me ka copolymer aliphatic, i ka hopena wai o ka hydroxypropyl methylcellulose. , a me nā mea electrolytes e like me ka chloride, bromide, phosphate, nitrate, a me nā mea ʻē aʻe hiki ke hoʻohui ʻia i ka wai wai. ʻAʻole e hoʻopili wale kēia mau mea hoʻohui i nā waiwai viscosity o ka hoʻonā wai, akā pili pū kekahi i nā waiwai noi o hydroxypropyl methylcellulose e like me ka paʻa ʻana o ka wai. , sag resistance, etc.
ʻAʻole pili ka viscosity o ka wai wai o hydroxypropyl methylcellulose e ka waikawa a me ka alkali, a paʻa maʻamau i ka laulā o 3 a hiki i 11. Hiki iā ia ke pale i kekahi nui o nā mea nāwaliwali, e like me ka formic acid, acetic acid, phosphoric acid, boric acid, citric acid, etc. Akā ʻaʻole liʻiliʻi ka hopena o ka soda caustic, potassium hydroxide, lime wai, etc. Hoʻohālikelike ʻia me nā cellulose ethers ʻē aʻe,hydroxypropyl methylcelluloseʻO ke kumu nui he mau pūʻulu hydrophobic me ke kiʻekiʻe o ka hoʻololi ʻana a me ka steric hindrance o nā pūʻulu, no ka mea, ʻaʻole like ka hopena o ka hoʻololi ʻana, ʻoi aku ka maʻalahi o ka ʻāpana anhydroglucose unsubstituted e nā microorganisms, e hopena i ka degradsion o cellulose ether scismolecules. ʻO ka hana ʻana ʻo ka emi ʻana o ka viscosity ʻikea o ka hoʻonā wai. Inā pono e mālama i ka wai wai o ka hydroxypropyl methylcellulose no ka manawa lōʻihi, ua ʻōlelo ʻia e hoʻohui i kahi ʻāpana o ka antifungal agent i ʻole e loli nui ka viscosity. Ke koho ʻoe i nā lāʻau anti-fungal, preservatives a i ʻole fungicides, pono ʻoe e hoʻolohe i ka palekana, a koho i nā huahana ʻaʻole ʻona i ke kino o ke kanaka, loaʻa nā waiwai paʻa a ʻaʻohe ʻala, e like me DOW Chem's AMICAL fungicides, CANGUARD64 preservatives, FUELSAVER bacteria agents a me nā huahana ʻē aʻe. hiki ke pāʻani i kahi kuleana kūpono.
Ka manawa hoʻouna: Apr-28-2024