ʻO ka ʻokoʻa ma waena o ka hoʻoheheʻe koke ʻana a me ka lohi o ka HPMC

Ma ka hoʻohana ʻana ohydroxypropyl methyl cellulose HPMC, ʻike pinepine mākou ua māhele ʻia i ʻelua ʻano: ka hoʻoheheʻe koke ʻana a me ka hoʻoheheʻe lohi. E hoʻomaopopo kākou i ka ʻokoʻa ma waena o ka hoʻoheheʻe wikiwiki a me ka hoʻoheheʻe lohi o ka hydroxypropyl methyl cellulose.

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

Hiki ke kapa ʻia ʻo HPMC hoʻoheheʻe lohi he mau huahana hoʻoheheʻe wela. Ke loaʻa ka wai anuanu, hiki ke hoʻopuehu koke ʻia i loko o 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 ma kahi o 60°C), e ʻike mālie ʻia ka mānoanoa a hiki i ka wā e hana ʻia ai kahi gel moakaka a pipili.

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 pū me mākou.

ʻO ka hydroxypropyl methyl celluloseHPMChoʻopaneʻe i ka hoʻoinu ʻana o ka sima

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

1. Kuhiakau o ka maʻi neʻe ʻana o ka ion

Ua kuhiakau mākou e hoʻonui ka hydroxypropyl methyl cellulose i ka viscosity o nā hopena pore, e hoʻopilikia i ka wikiwiki o ka neʻe ʻana o ka ionic, a e hoʻopaneʻe i ka hydration o ka sima. Eia nō naʻe, ʻoi aku ka ikaika o ka hiki o nā ethers cellulose viscosity haʻahaʻa i kēia hoʻāʻo e hoʻopaneʻe i ka hydration o ka sima. No laila, ʻaʻole kūpono kēia kuhiakau. Ke kānalua nei hoʻi ʻo Pourchez et al. i kēia kuhiakau. ʻO ka ʻoiaʻiʻo, he pōkole loa ka manawa o ka neʻe ʻana o ka ion a i ʻole ka neʻe ʻana, ʻaʻole like me ka lohi o ka hydration o ka sima.

2. Ka hoʻohaʻahaʻa ʻana o ka alkaline

Hoʻohaʻahaʻa koke nā polysaccharides ma lalo o nā kūlana alkaline e hana i nā waikawa hydroxyl carboxylic e hoʻopaneʻe ana i ka hydration sima. No laila, ʻo ka hydration lohi o ka hydroxypropyl methyl cellulose ma muli paha o kona hoʻohaʻahaʻa ʻia ʻana i loko o nā slurries sima alkaline e hana i nā waikawa hydroxycarboxylic. Eia nō naʻe, ua ʻike ʻo Pourchez et al. ua paʻa loa nā cellulose ethers ma lalo o nā kūlana alkaline, ua hoʻohaʻahaʻa iki ʻia, a ʻaʻole nui ka hopena o 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 ʻo ia ka nui o nā mea hoʻohui organik e adsorbed ma nā ʻāpana sima a me nā huahana hydration, pale i ka hoʻoheheʻe ʻana o nā ʻāpana sima a me ka crystallization o nā huahana hydration, i mea e hoʻopaneʻe ai i ka hydration a me ka condensation o ka sima. Ua ʻike ʻo Pourchez et al. ua adsorbed maʻalahi nā cellulose ethers ma luna o nā ʻili o nā huahana hydration e like me ka calcium hydroxide, CSH gel a me ka calcium aluminate hydrate, akā ʻaʻole i adsorbed maʻalahi e ka ettringite a me nā pae unhydrated. Eia kekahi, i ke ʻano o ka cellulose ether, ʻoi aku ka ikaika o ka hiki ke adsorption o HEC ma mua o ka pehu ʻana o MC. ʻO ka haʻahaʻa o ka ʻike o ka hydroxyethyl ma HEC a i ʻole hydroxypropyl i lokoHPMC, ʻoi aku ka ikaika o ka hiki ke hoʻopili ʻia: no nā huahana hydration, ʻoi aku ka ikaika o ka hiki ke hoʻopili ʻia o ka calcium hydroxide ma mua o CSH. Hōʻike pū ka loiloi hou aku e pili ana ka hiki ke hoʻopili ʻia o nā huahana hydration a me ka cellulose ether i ka lohi o ka hydration sima: ʻoi aku ka ikaika o ka adsorption, ʻoi aku ka maopopo o ka lohi, akā nāwaliwali ka adsorption ettringite o ka cellulose ether, akā ua lohi nui kēia. Loaʻa i ka cellulose ether o tricalcium silicate a me kāna mau huahana hydration kahi adsorption ikaika, maopopo ia e hoʻopaneʻe i ke kaʻina hydration o ka silicate phase, haʻahaʻa loa ka nui o ka adsorption o ka ettringite, akā maopopo ka lohi o ka hoʻopili ʻana o ka ettringite, ma muli o ka lohi o ka hoʻopili ʻana o ka ettringite e pili ana i ke kaulike Ca2+ i loko o ka hopena, he hoʻonui ia o ka cellulose ether. Ua hoʻomau ka hydration silicate hope.

ʻO kēia nā loina hydration cement hydroxypropyl methyl cellulose delay. Manaʻolana mākou e hiki i kēia ʻike i nā mea āpau ke hoʻomaopopo i ke ʻano o ka hana ʻana o ka huahana a hoʻohana maikaʻi aku.