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ʻO nā ʻano Viscosity o Hydroxypropyl Methyl Cellulose

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 hoʻonā me ka piʻi ʻana o ka shear rate, kahi kūpono 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.He paʻakikī ke kālailai ʻana i nā viscosities o nā cellulose ethers me ka hoʻohana ʻana i ka viscometer capillary no ka mea aia kēia mau haʻina i 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.

ʻO ka viscosity o ka solution aqueous o ka hydroxypropyl methylcellulose aneane ʻaʻole i hoʻopilikia ʻia e ka waikawa a me ka alkali, a paʻa mau i ka laulā o 3 a hiki i 11. Hiki iā ia ke kū i kahi nui o nā waikawa nāwaliwali, e like me ka formic acid, acetic acid, phosphoric acid. , ʻakika boric, ʻakika citric, a me nā mea ʻē aʻe. Eia naʻe, e hoʻemi ka waika concentrated i ka viscosity.Akā ʻaʻole liʻiliʻi ka hopena o ka soda caustic, potassium hydroxide, lime wai, etc.Ke hoʻohālikelike ʻia me nā cellulose ethers, hydroxypropyl methylcellulose aqueous solution he antimicrobial stability maikaʻi, ʻo ke kumu nui ʻo ka hydroxypropyl methylcellulose he mau pūʻulu hydrophobic me ke kiʻekiʻe o ka hoʻololi a me ka steric hindrance o nā pūʻulu. ʻoi aku ka maʻalahi o ka hoʻopau ʻia e nā microorganism, ka hopena i ka hoʻohaʻahaʻa ʻana i nā molekole ether cellulose a me ka ʻoki kaulahao.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 ʻana 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: Oct-20-2022