ʻO ka ʻokoʻa ma waena o ka hemo koke a me ka lohi o ka HPMC

I ka hoohana ana ihydroxypropyl methyl cellulose HPMC, ʻike pinepine mākou ua māhele ʻia i ʻelua ʻano: hemo koke a me ka lohi. E hoʻomaopopo kākou i ka ʻokoʻa ma waena o ka hemo wikiwiki a me ka hemo mālie o ka hydroxypropyl methyl cellulose.

ʻO ka HPMC hikiwawe e pili ana i ka hoʻohana ʻana i ka mea hoʻopili keʻa no ka mālama ʻana i ka ʻili i ka hana hana, i hiki ke hoʻopuehu koke ʻia ka HPMC i ka wai anuanu, akā ʻaʻole ia he hopena maoli, ma o ka hoʻoulu ʻana i nā ʻano like ʻole, piʻi mālie ka viscosity, ʻo ia hoʻi, dissolution;

Hiki ke kapa ʻia ʻo HPMC hiki ke hoʻoheheʻe lohi i nā huahana hoʻoheheʻe wela. Ke loaʻa ka wai anuanu, hiki ke hoʻopuehu koke i ka wai wela. Ma ka hoʻoulu like ʻana, e hāʻule ka mahana o ka hopena i kahi mahana. (ʻO ka mahana o kā mākou gel e pili ana i 60 ° C), e ʻike mālie ka viscosity a hiki i ka hoʻokumu ʻana o kahi gel akaka a paʻa.

Eia ka ʻokoʻa ma waena o ka hoʻonā koke a me ka hoʻonā lohi. Inā he mau nīnau kāu e pili ana i kēia ʻike, hiki iā ʻoe ke nīnau iā mākou.

Hydroxypropyl methyl celluloseHPMChoʻopaneʻe i ka hydration sima

ʻO ka hoʻohui ʻana i ka hydroxypropyl methyl cellulose i ka sima e hoʻolohi i kona hydration. No laila he aha kāu ʻike e pili ana i ka hana ʻana? E nānā kākou i ka hydroxypropyl methyl cellulose no ka hoʻopaneʻe ʻana i ka hydration sima. Kumukānāwai.

1. Kuhiakau pilikia o ka Ion movement

Ua manaʻo mākou e hoʻonui ka hydroxypropyl methyl cellulose i ka viscosity o nā pore solutions, ke keʻakeʻa i ka wikiwiki o ka neʻe ionic, a hoʻopaneʻe i ka hydration o ka sima. Eia nō naʻe, ʻoi aku ka ikaika o ka cellulose ethers viscosity haʻahaʻa i kēia hoʻāʻo e hoʻopaneʻe i ka hydration sima. No laila, ʻaʻole kūpono kēia manaʻo. Pourchez et al. kanalua no hoi keia kuhiakau. ʻO ka ʻoiaʻiʻo, pōkole loa ka manawa o ka neʻe ʻana a i ʻole ka neʻe ʻana, ʻaʻole like me ka lohi o ka hydration sima.

2. Hoʻohaʻahaʻa i ka alkaline

Hiki ke hoʻohaʻahaʻa i nā polysaccharides ma lalo o nā kūlana alkaline e hana i nā waikawa hydroxyl carboxylic e hoʻopaneʻe i ka hoʻoheheʻe ʻana i ka sima. No laila, hiki i ka hydration lohi o ka hydroxypropyl methyl cellulose ma muli o kona hoʻohaʻahaʻa ʻana i nā slurries sima alkaline e hana i nā waikawa hydroxycarboxylic. Eia naʻe, Pourchez et al. Ua ʻike ʻia ua kūpaʻa loa nā cellulose ethers ma lalo o nā kūlana alkaline, hoʻohaʻahaʻa wale ʻia, a ʻaʻole liʻiliʻi nā huahana degradation i ka lohi o ka hydration sima.

3, ka adsorption

Hiki i ka Adsorption ke hydroxypropyl methyl cellulose block cement hydration ke kumu maoli no ka nui o nā mea hoʻohui i hoʻohui ʻia e hoʻopili ʻia ma nā ʻāpana sima a me nā huahana hydration, e pale i ka hoʻoheheʻe ʻana o nā ʻāpana sima a me ka crystallization o nā huahana hydration, no laila e hoʻopaneʻe i ka hydration a me ka condensation o ka sima. Pourchez et al. Ua ʻike ʻia ua hoʻopili koke ʻia nā cellulose ethers ma nā ʻili o nā huahana hydration e like me ka calcium hydroxide, CSH gel a me ka calcium aluminate hydrate, akā ʻaʻole hiki ke hoʻopili ʻia e ka ettringite a me nā pae wai ʻole. Eia kekahi, i ka hihia o ka cellulose ether, ʻoi aku ka ikaika o ka adsorption o HEC ma mua o ka pehu MC. ʻO ka haʻahaʻa o ka hydroxyethyl ma HEC a i ʻole hydroxypropyl inHPMC, ʻoi aku ka ikaika o ka mana adsorption: e like me nā huahana hydration, ʻoi aku ka ikaika o ka adsorption o ka calcium hydroxide ma mua o ka CSH. ʻO ka nānā hou aku e hōʻike ana i ka hiki ʻana o ka adsorption o nā huahana hydration a me cellulose etera e pili ana i ka lohi o ka hydration sima: ʻoi aku ka ikaika o ka adsorption, ʻoi aku ka maopopo o ka lohi, akā nāwaliwali ka ettringite adsorption o cellulose etera, akā ʻo kona hoʻokumu ʻana, akā ua lohi nui kēia. ʻO ka cellulose etera o ka tricalcium silicate a me kāna mau huahana hydration he adsorption ikaika, maopopo ka lohi i ke kaʻina hana hydration o ka pae silicate, haʻahaʻa loa ka adsorption o ka ettringite, akā ʻike ʻia ka hoʻopaneʻe ʻana o ka ettringite, no ka hoʻopaneʻe ʻana o ka ettringite e hoʻopili ʻia e Ca 2 + koena i ka hopena, he hoʻonui ia o ka cellulose. Ua hoʻomau ʻia ka hydration silicate hope.

ʻO kēia nā hydroxypropyl methyl cellulose e hoʻopaneʻe i ke kumu hoʻoheheʻe cement. Manaʻo mākou e hiki i kēia ʻike ke hoʻomaopopo i ka hana a ka huahana a hoʻohana maikaʻi.