Ka hopena o ka wela ambient i ka hana o ka cellulose ether gypsum i hoʻololi ʻia

He ʻokoʻa loa ka hana o ka cellulose ether i hoʻololi ʻia i ka gypsum i nā mahana ambient like ʻole, akā ʻaʻole maopopo kona ʻano. Ua aʻo ʻia nā hopena o ka cellulose ether ma nā ʻāpana rheological a me ka mālama ʻana i ka wai o ka gypsum slurry ma nā ʻano wela ambient. Ua ana ʻia ke anawaena hydrodynamic o cellulose ether i loko o ka pae wai e ke ʻano hoʻopuʻi māmā māmā, a ua ʻimi ʻia ke ʻano hana mana. Hōʻike nā hualoaʻa he hopena maikaʻi ka mālama wai a me ka mānoanoa o ka cellulose ether i ka gypsum. Me ka hoʻonui ʻana o ka ʻike cellulose ether, piʻi ka viscosity o ka slurry a piʻi ka hiki ke mālama i ka wai. Eia nō naʻe, me ka piʻi ʻana o ka mahana, hoʻemi ʻia ka mana mālama wai o ka gypsum slurry i hoʻololi ʻia i kekahi ʻano, a hoʻololi pū nā ʻāpana rheological. Ke noʻonoʻo nei e hiki i ka hui cellulose ether colloid ke hoʻokō i ka paʻa ʻana o ka wai ma ke kāohi ʻana i ke kahawai lawe wai, hiki i ka piʻi ʻana o ka mahana ke alakaʻi i ka hoʻopau ʻana o ka hui nui nui i hana ʻia e ka cellulose ether, pēlā e hōʻemi ai i ka paʻa ʻana o ka wai a me ka hana hana o ka gypsum i hoʻololi ʻia.

Hua'ōlelo nui:gypsum; Cellulose ether; Ka wela; Paʻa wai; rheology

0. Hoolauna

ʻO Gypsum, ma ke ʻano he ʻano mea pili i ke kaiapuni me ka hana maikaʻi a me nā waiwai kino, hoʻohana nui ʻia i nā hana hoʻonaninani. I ka hoʻohana ʻana i nā mea hana gypsum, hoʻohui pinepine ʻia ka mea mālama wai e hoʻololi i ka slurry e pale i ka nalowale o ka wai i ke kaʻina o ka hydration a me ka paʻakikī. ʻO ka cellulose ether ka mea mālama wai maʻamau i kēia manawa. No ka mea, e hana ana ka Ionic CE me Ca2+, e hoʻohana pinepine i ka CE non-ionic, e like me: hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether a me methyl cellulose ether. He mea nui e aʻo i nā waiwai o ka cellulose ether i hoʻololi ʻia gypsum no ka hoʻohana maikaʻi ʻana o ka gypsum i ka ʻenehana hoʻonaninani.

ʻO ka cellulose ether kahi pūhui molekala kiʻekiʻe i hana ʻia e ka hopena o ka cellulose alkali a me ka etherifying agent ma lalo o kekahi mau kūlana. ʻO ka nonionic cellulose ether i hoʻohana ʻia i ka ʻenehana kūkulu hale he maikaʻi ka hoʻopuehu, paʻa wai, hoʻopaʻa a me ka hopena mānoanoa. ʻO ka hoʻohui ʻana o ka cellulose ether he hopena maopopo loa i ka paʻa ʻana o ka wai o ka gypsum, akā ʻo ke kulou a me ka ikaika compressive o ke kino paʻakikī gypsum e emi iki pū me ka hoʻonui ʻana i ka nui o ka hoʻohui. ʻO kēia ke kumu no ka loaʻa ʻana o ka cellulose ether i kekahi hopena entraining ea, e hoʻolauna i nā ʻōhū i ke kaʻina o ka hui ʻana o ka slurry, pēlā e hōʻemi ai i nā waiwai mechanical o ke kino paʻakikī. I ka manawa like, ʻoi aku ka nui o ka cellulose ether e hoʻopili i ka hui gypsum, e hopena i kāna hana hana.

Hiki ke hoʻokaʻawale ʻia ke kaʻina hana hydration o ka gypsum i ʻehā mau ʻanuʻu: ka dissolution o ka calcium sulfate hemihydrate, crystallization nucleation o ka calcium sulfate dihydrate, ka ulu ʻana o ka crystalline nucleus a me ka hoʻokumu ʻana o ka crystalline structure. I ke kaʻina hana hydration o ka gypsum, ʻo ka hui hydrophilic o ka cellulose ether adsorbing ma ka ʻili o nā ʻāpana gypsum e hoʻoponopono i kahi ʻāpana o nā mole wai, no laila e hoʻopaneʻe i ke kaʻina hana nucleation o ka hydration gypsum a hoʻonui i ka manawa hoʻonohonoho o ka gypsum. Ma o ka nānā ʻana iā SEM, ua ʻike ʻo Mroz ʻoiai ʻo ka hiki ʻana o ka cellulose ether i hoʻopaneʻe i ka ulu ʻana o nā kristal, akā hoʻonui i ka overlap a me ka hōʻuluʻulu ʻana o nā kristal.

Cellulose etera loaʻa hydrophilic pūʻulu no laila, i kekahi hydrophilicity, polymer kaulahao lōʻihi interconnecting me kekahi i kekahi no laila, he kiʻekiʻe viscosity, ka pilina o na mea elua e cellulose i ka wai-hoʻopaʻa thickening hopena maikaʻi ma gypsum hui. Ua wehewehe ʻo Bulichen i ke ʻano o ka mālama ʻana i ka wai o ka cellulose ether i loko o ka sima. I ka hui ʻana haʻahaʻa, hoʻopili ʻia ka cellulose ether ma ka sima no ka absorption wai intramolecular a hele pū me ka pehu e hoʻokō i ka paʻa wai. I kēia manawa, ʻino ka mālama ʻana i ka wai. ʻO ke ʻano kiʻekiʻe, cellulose ether e hana i nā haneli nanometers i kahi mau microns o ka polymer colloidal, me ka pale ʻana i ka ʻōnaehana gel i loko o ka lua, e hoʻokō i ka paʻa wai kūpono. ʻO ke ʻano hana o ka cellulose ether i loko o ka gypsum ua like ia me ka cement, akā ʻo ke kiʻekiʻe o ka SO42-concentration ma ka pae wai o ka gypsum slurry e hoʻonāwaliwali i ka hopena paʻa wai o cellulose.

Ma muli o ka ʻike ma luna, hiki ke ʻike ʻia ʻo ka noiʻi o kēia manawa e pili ana i ka cellulose ether modified gypsum ka nui o ka nānā ʻana i ke kaʻina hana hydration o cellulose ether ma gypsum mix, nā waiwai mālama wai, nā waiwai mechanical a me nā microstructure o ke kino paʻakikī, a me ke ʻano o ka cellulose ether. paʻa wai. Eia naʻe, ʻaʻole lawa ka haʻawina e pili ana i ka pilina ma waena o ka cellulose ether a me ka gypsum slurry i ka wela kiʻekiʻe. ʻO ka hopena wai o ka cellulose ether e gelatinize i kahi mahana kikoʻī. Ke piʻi aʻe ka mahana, e emi mālie ka viscosity o cellulose ether aqueous solution. Ke hiki i ka mahana gelatinization, cellulose ether e precipitated i keʻokeʻo gel. No ka laʻana, i ke kauwela kūkulu, ua kiʻekiʻe ka ambient wela, ka thermal gel waiwai o cellulose ether ua paa e alakai i ka hoʻololi i ka workability o hoʻololi 'ia gypsum slurry. Ke ʻimi nei kēia hana i ka hopena o ka piʻi ʻana o ka mahana ma luna o ka hana o ka cellulose ether i hoʻololi ʻia gypsum material ma o nā hoʻokolohua ʻōnaehana, a hāʻawi i ke alakaʻi no ka hoʻohana pono ʻana o ka cellulose ether modified gypsum.

1. Hoao

1.1 Mea Maka

ʻO Gypsum ka β-type maoli hale gypsum i hāʻawi ʻia e Beijing Ecological Home Group.

ʻO ka cellulose ether i koho ʻia mai Shandong Yiteng Group hydroxypropyl methyl cellulose ether, nā kikoʻī o nā huahana no 75,000 mPa·s, 100,000 mPa·s a me 200000mPa·s, ka mahana gelation ma luna o 60 ℃. Ua koho ʻia ʻo Citric acid ma ke ʻano he gypsum retarder.

1.2 Ho'āʻo Rheology

ʻO ka mea hana hōʻike rheological i hoʻohana ʻia ʻo RST⁃CC rheometer i hana ʻia e BROOKFIELD USA. Ua hoʻoholo ʻia nā ʻāpana Rheological e like me ka plastic viscosity a me ke koʻikoʻi shear yield o ka gypsum slurry e MBT⁃40F⁃0046 sample container a me CC3⁃40 rotor, a ua hana ʻia ka ʻikepili e ka polokalamu RHE3000.

ʻO nā hiʻohiʻona o ka hui gypsum e like me ke ʻano rheological o ka wai Bingham, i aʻo mau ʻia me ka hoʻohana ʻana i ka hoʻohālike Bingham. Eia nō naʻe, ma muli o ka pseudoplasticity o ka cellulose ether i hoʻohui ʻia i ka gypsum i hoʻololi ʻia i ka polymer, ʻo ka hui ʻana o ka slurry e hōʻike maʻamau i kekahi waiwai ʻokiʻoki. I kēia hihia, hiki ke wehewehe maikaʻi i ke kumu hoʻohālike Bingham (M⁃B) i hoʻololi ʻia i ka pihi rheological o gypsum. No ke aʻo ʻana i ka hoʻololi ʻana o ka gypsum, hoʻohana pū kēia hana i ke kumu hoʻohālike Herschel⁃Bulkley (H⁃B).

1.3 Ho'āʻo paʻa wai

E nānā ke kaʻina hana hoʻāʻo iā GB/T28627⁃2012 Plastering Plaster. I ka wā o ka hoʻokolohua me ka mahana e like me ka mea hoʻololi, ua preheated ka gypsum 1h ma mua i ka wela kūpono i ka umu, a me ka wai hui ʻia i hoʻohana ʻia i ka hoʻokolohua ua preheated 1h i loko o ka mahana kūpono i ka ʻauʻau wai wela mau, a me ka mea kani i hoʻohana ʻia. ua hoʻomehana ʻia.

1.4 Hydrodynamic anawaena hoao

Ua ana ʻia ke anawaena hydrodynamic (D50) o ka hui polimer HPMC ma ka pae wai me ka hoʻohana ʻana i ka mea ananali nui e hoʻopuʻi ana i ka māmā māmā (Malvern Zetasizer NanoZS90).

2. Nā hopena a me ke kūkākūkā

2.1 Rheological waiwai o HPMC hoʻololi gypsum

ʻO ka viscosity ʻike ʻia ka lakio o ke koʻikoʻi ʻāwili a me ka nui o ka shear e hana ana ma luna o kahi wai a he ʻāpana ia e ʻike ai i ke kahe ʻana o nā wai non-Newtonian. Ua hoʻololi ʻia ka viscosity o ka gypsum slurry i hoʻololi ʻia me ka ʻike o ka cellulose ether ma lalo o ʻekolu mau kikoʻī like ʻole (75000mPa·s, 100,000mpa · s a me 200000mPa·s). ʻO ka mahana ho'āʻo he 20 ℃. I ka manawa o ka shear rate o rheometer he 14min-1, hiki ke ʻike ʻia e piʻi ka viscosity o ka gypsum slurry me ka hoʻonui ʻana o ka HPMC incorporation, a ʻoi aku ka kiʻekiʻe o ka viscosity HPMC, ʻoi aku ka kiʻekiʻe o ka viscosity o ka gypsum slurry i hoʻololi ʻia. Hōʻike kēia i ka HPMC i maopopo ka mānoanoa a me ka viscosification hopena ma ka gypsum slurry. ʻO ka gypsum slurry a me ka cellulose ether nā mea me kahi viscosity. I loko o ka hui gypsum i hoʻololi ʻia, ua hoʻopili ʻia ka cellulose ether ma luna o ka ʻili o nā huahana hydration gypsum, a ʻo ka pūnaewele i hoʻokumu ʻia e cellulose ether a me ka pūnaewele i hoʻokumu ʻia e ka hui gypsum e hoʻopili ʻia, e hopena i ka "superposition effect", e hoʻomaikaʻi nui i ka viscosity holoʻokoʻa. ka mea gypsum i hoʻololi ʻia.

ʻO nā ʻāpana koʻikoʻi shear ⁃ o ka gypsum maʻemaʻe (G⁃H) a me ka gypsum i hoʻololi ʻia (G⁃H) paʻi doped me 75000mPa· s-HPMC, e like me ka mea i ʻike ʻia mai ke kumu hoʻohālike Bingham (M⁃B) i hoʻoponopono ʻia. Hiki ke ʻike ʻia me ka piʻi ʻana o ka shear rate, piʻi pū ke koʻikoʻi shear o ka hui ʻana. Loaʻa nā waiwai o ka viscosity plastic (ηp) a me ke koʻikoʻi shear yield (τ0) o ka gypsum maʻemaʻe a me ka gypsum hoʻololi HPMC i nā wela like ʻole.

Mai ka viscosity plastic (ηp) a me ke koʻikoʻi shear yield (τ0) nā waiwai o ka gypsum maʻemaʻe a me ka gypsum hoʻololi HPMC i nā mahana like ʻole, hiki ke ʻike ʻia e emi mau ana ke koʻikoʻi o ka gypsum hoʻololi HPMC me ka piʻi ʻana o ka mahana, a me ka hua. e emi ana ke kaumaha i 33% ma 60 ℃ i hoʻohālikelike ʻia me 20 ℃. Ma ka nānā ʻana i ke kaʻe viscosity plastic, hiki ke ʻike ʻia ka emi ʻana o ka viscosity plastic o ka gypsum slurry i hoʻololi ʻia me ka piʻi ʻana o ka mahana. Eia naʻe, hoʻonui iki ka hoʻoulu ʻana o ke kaumaha a me ka plastic viscosity o ka gypsum slurry maʻemaʻe me ka piʻi ʻana o ka mahana, e hōʻike ana i ka hoʻololi ʻana o nā ʻāpana rheological o HPMC i hoʻololi ʻia gypsum slurry i ke kaʻina o ka piʻi ʻana o ka mahana ma muli o ka hoʻololi ʻana o nā waiwai HPMC.

Hōʻike ka waiwai koʻikoʻi o ka gypsum slurry i ke koʻikoʻi koʻikoʻi koʻikoʻi i ka wā e pale aku ai ka slurry i ka hoʻololi ʻana. ʻOi aku ka nui o ka waiwai koʻikoʻi, ʻoi aku ka paʻa o ka gypsum slurry. Hōʻike ka viscosity plastic i ka deformation rate o ka gypsum slurry. ʻOi aku ka nui o ka viscosity plastic, ʻoi aku ka lōʻihi o ka manawa shear deformation o ka slurry. I ka hopena, ʻo nā ʻāpana rheological ʻelua o ka HPMC i hoʻololi ʻia i ka gypsum slurry e emi iho me ka piʻi ʻana o ka mahana, a nāwaliwali ka hopena mānoanoa o ka HPMC ma ka gypsum slurry.

ʻO ka hoʻoheheʻe ʻana o ka slurry e pili ana i ka shear thickening a i ʻole ka shear thinning hopena i hōʻike ʻia e ka slurry i ka wā i hoʻokau ʻia i ka ikaika shear. Hiki ke hoʻoholo ʻia ka hopena deformation shear o ka slurry e ka pseudoplastic index n i loaʻa mai ka pihi kūpono. Ke hōʻike ʻia ka n < 1, ʻo ka slurry gypsum e hōʻike ana i ka ʻoki ʻoki ʻana, a ʻoi aku ka kiʻekiʻe o ke degere ʻokiʻoki o ka gypsum slurry me ka emi ʻana o ka n. I ka n> 1, ua hōʻike ka slurry gypsum i ka mānoanoa shear, a ua hoʻonui ʻia ke degere mānoanoa o ka gypsum slurry me ka piʻi ʻana o n. Rheological curves o HPMC hoʻololi gypsum slurry ma okoa wela ma muli o Herschel⁃Bulkley (H⁃B) kükohu kükohu, pela e loaa ka pseudoplastic index n o HPMC hoololi gypsum slurry.

Wahi a ka pseudoplastic index n o ka slurry gypsum i hoʻololi ʻia e HPMC, ʻo ka shear deformation o ka gypsum slurry i hui pū ʻia me HPMC he shear thinning, a piʻi mālie ka waiwai n me ka piʻi ʻana o ka mahana, e hōʻike ana i ka hana ʻoki ʻoki ʻana o ka gypsum hoʻololi ʻia e HPMC. e hoʻonāwaliwali i kekahi ʻano ke hoʻopilikia ʻia e ka mahana.

Ma muli o nā hoʻololi viscosity ʻike ʻia o ka gypsum slurry i hoʻololi ʻia me ka shear rate i helu ʻia mai ka shear stress data o 75000 mPa · HPMC ma nā mahana like ʻole, hiki ke ʻike ʻia ke emi wikiwiki nei ka viscosity plastic o ka gypsum slurry i hoʻololi ʻia me ka piʻi ʻana o ka nui o ka shear rate. e hōʻoia ana i ka hopena kūpono o ke kumu hoʻohālike H⁃B. Ua hōʻike ʻia ka slurry gypsum i hoʻololi ʻia. Me ka piʻi ʻana o ka mahana, e emi ana ka viscosity o ka hui ʻana i kekahi ʻano me ka haʻahaʻa haʻahaʻa haʻahaʻa, e hōʻike ana ua nāwaliwali ka hopena shear thinning o ka gypsum slurry i hoʻololi ʻia.

I ka hoʻohana maoli ʻana i ka gypsum putty, pono ka maʻalahi o ka gypsum slurry e hoʻololi i ke kaʻina hana a me ka noho paʻa i ka hoʻomaha ʻana, e koi ana i ka gypsum slurry e loaʻa i nā hiʻohiʻona ʻoki ʻoki maikaʻi, a ʻo ka hoʻololi ʻana o ka gypsum i hoʻololi ʻia ʻo HPMC ʻaʻole hiki ke loaʻa. kahi ākea, ʻaʻole kūpono i ke kūkulu ʻana i nā mea gypsum. ʻO ka viscosity o HPMC kekahi o nā ʻāpana koʻikoʻi, a ʻo ke kumu nui hoʻi e pāʻani ana ia i ke ʻano o ka mānoanoa e hoʻomaikaʻi i nā ʻano loli o ka hui ʻana. Loaʻa i ka cellulose ether nā waiwai o ka gel wela, e emi mālie ana ka viscosity o kāna hoʻonā wai e like me ka piʻi ʻana o ka mahana, a hoʻomaka ka gel keʻokeʻo i ka wā e hiki ai i ka mahana gelation. ʻO ka hoʻololi ʻana o nā ʻāpana rheological o ka cellulose ether i hoʻololi ʻia i ka gypsum me ka mahana e pili kokoke ana i ka loli o ka viscosity, no ka mea, ʻo ka hopena mānoanoa ka hopena o ka superposition o cellulose ether a me ka slurry hui ʻia. Ma ka hana ʻenekinia pono, pono e noʻonoʻo ʻia ka hopena o ka wela o ke kaiapuni i ka hana HPMC. No ka laʻana, pono e hoʻomalu ʻia ka mahana o nā mea maka i ka wela kiʻekiʻe i ke kauwela e pale aku i ka hana maikaʻi ʻole o ka gypsum i hoʻololi ʻia e ka wela kiʻekiʻe.

2.2 Paʻa wai oHPMC gypsum hoʻololi

Hoʻololi ʻia ka paʻa ʻana o ka wai o ka gypsum slurry me ʻekolu mau kikoʻī like ʻole o ka cellulose ether me ka pihi dosage. Me ka piʻi ʻana o ka helu HPMC, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai o ka gypsum slurry, a paʻa ka piʻi ʻana i ka wā i hiki ai ka helu HPMC i 0.3%. ʻO ka mea hope loa, paʻa ka pae paʻa wai o ka gypsum slurry ma 90% ~ 95%. Hōʻike kēia i ka loaʻa ʻana o ka hopena hoʻopaʻa wai o ka HPMC ma ka paʻi paʻi pōhaku, akā ʻaʻole i hoʻomaikaʻi maikaʻi ʻia ka hopena hoʻopaʻa wai i ka piʻi ʻana o ka dosage. ʻEkolu mau kikoʻī o ka ʻokoʻa paʻa wai paʻa wai HPMC ʻaʻole nui, no ka laʻana, inā he 0.3% ka maʻiʻo, ʻo 5% ka nui o ka mālama ʻana i ka wai, ʻo 2.2 ka ʻokoʻa maʻamau. ʻO ka HPMC me ka viscosity kiʻekiʻe, ʻaʻole ia ka helu kiʻekiʻe o ka mālama ʻana i ka wai, a ʻo ka HPMC me ka viscosity haʻahaʻa ʻaʻole ia ka helu haʻahaʻa paʻa wai. Eia naʻe, ke hoʻohālikelike ʻia me ka gypsum maʻemaʻe, ʻoi aku ka maikaʻi o ka hoʻopaʻa ʻana o ka wai o nā HPMC ʻekolu no ka slurry gypsum, a ua hoʻonui ʻia ka nui o ka mālama ʻana i ka wai o ka gypsum i hoʻololi ʻia ma ka 0.3% maʻiʻo e 95%, 106%, 97% i hoʻohālikelike ʻia me ka pūʻulu mana blank. Hiki i ka cellulose ether ke hoʻomaikaʻi i ka mālama ʻana i ka wai o ka gypsum slurry. Me ka hoʻonui ʻana o ka ʻike HPMC, hiki i ka helu hoʻopaʻa wai o ka HPMC gypsum slurry me ka viscosity ʻokoʻa ke hiki i ka saturation point. 10000mPa · sHPMC i hiki i ka saturation wahi ma 0.3%, 75000mPa · s a me 20000mPa · s HPMC i ka saturation wahi ma 0.2%. Hōʻike nā hopena i ka paʻa ʻana o ka wai o 75000mPa·s HPMC i hoʻololi i ka gypsum i hoʻololi ʻia me ka mahana ma lalo o nā ʻano like ʻole. Me ka emi ana o ka wela, e emi malie ana ka nui o ka wai o ka gypsum i ho'ololi 'ia, oiai ke mau nei ka wai o ka gypsum ma'ema'e, e hō'ike ana i ka pi'i 'ana o ka mahana e ho'onāwaliwali i ka hopena pa'a o ka wai o HPMC ma ka gypsum. Ua emi ka nui o ka mālama wai o HPMC ma 31.5% ke piʻi ka mahana mai 20 ℃ a 40 ℃. Ke piʻi ka mahana mai 40 ℃ a 60 ℃, ʻo ka nui o ka mālama ʻana i ka wai o ka gypsum i hoʻololi ʻia e HPMC e like me ka gypsum maʻemaʻe, e hōʻike ana ua nalowale ka HPMC i ka hopena o ka hoʻomaikaʻi ʻana i ka mālama wai o ka gypsum i kēia manawa. Jian Jian a me Wang Peiming manao ia cellulose etera iho i ka thermal gel mea, e hoʻololi i ka mahana hoʻololi i ka viscosity, morphology a me adsorption o cellulose etera, ka mea i hoʻopaʻa 'ia e alakai i ka hoʻololi i ka hana o ka slurry hui. Ua ʻike pū ʻo Bulichen i ka emi ʻana o ka viscosity ikaika o nā hoʻonā cement me HPMC me ka piʻi ʻana o ka mahana.

Pono e hui pū ʻia ka hoʻololi o ka paʻa ʻana o ka wai o ka hui ʻana e ka piʻi ʻana o ka mahana me ke ʻano o ka cellulose ether. Ua wehewehe ʻo Bulichen i ke ʻano e hiki ai i ka cellulose ether ke mālama i ka wai i loko o ka sima. Ma nā ʻōnaehana sima, hoʻomaikaʻi ʻo HPMC i ka nui o ka mālama ʻana i ka wai o ka slurry ma o ka hoʻemi ʻana i ka permeability o ka "keke kānana" i hana ʻia e ka ʻōnaehana cementing. Hoʻokumu ʻia kahi ʻano o ka HPMC i loko o ka wai wai i mau haneli nanometers i kekahi mau microns o ka hui colloidal, loaʻa iā ia kahi leo o ka hale polymer hiki ke hoʻopili pono i ke kahawai hoʻoili wai i ka hui ʻana, e hōʻemi i ka permeability o "kā kānana", e hoʻokō pono i ka mālama ʻana i ka wai. Ua hōʻike pū ʻo Bulichen e hōʻike ana ʻo HPMCS i ka gypsum i ka hana like. No laila, hiki i ke aʻo ʻana o ke anawaena hydromechanical o ka hui i hoʻokumu ʻia e HPMC i ka pae wai ke wehewehe i ka hopena o ka HPMC i ka paʻa wai o ka gypsum.

2.3 Hydrodynamic anawaena o HPMC colloid hui

Māhele mahele nā ​​pihi o ka like 'ole o ka 75000mPa · s HPMC i loko o ka wai pae, a me ka puliki puunaue ana o ekolu kiko'ī o HPMC i loko o ka wai pae ma ka noonoo ana o 0.6%. Hiki ke ʻike ʻia mai ka puʻupuʻu puʻupuʻu o ka HPMC o ʻekolu mau kikoʻī i ka pae wai ke 0.6% ka hoʻonui ʻana, me ka piʻi ʻana o ka ʻike HPMC, piʻi pū ka nui o nā pūhui pili i hana ʻia i ka pae wai. I ka haʻahaʻa ʻana o ka manaʻo, liʻiliʻi nā ʻāpana i hana ʻia e ka HPMC aggregation, a he hapa liʻiliʻi wale nō o ka HPMC aggregate i loko o nā ʻāpana o kahi 100nm. I ka helu ʻana o ka HPMC he 1%, aia ka nui o nā hui colloidal me kahi anawaena hydrodynamic ma kahi o 300nm, he hōʻailona koʻikoʻi ia o ka overlap molecular. Hiki i kēia ʻano polymerization "nui" ke hoʻopaʻa pono i ke kahawai hoʻoili wai i ka hui ʻana, e hōʻemi i ka "permeability o ka keke", a ʻoi aku ka nui o ka paʻa ʻana o ka wai o ka hui gypsum ma kēia ʻano ma mua o 90%. ʻO nā anawaena hydromechanical o HPMC me nā viscosities ʻē aʻe i ka pae wai he mea like ia, e wehewehe ana i ka paʻa wai like o ka HPMC i hoʻololi ʻia gypsum slurry me nā viscosities like ʻole.

ʻO nā ʻāpana puʻupuʻu nui o ka 75000mPa·s HPMC me ka 1% kaʻina ma nā wela like ʻole. Me ka piʻi ʻana o ka mahana, hiki ke ʻike maopopo ʻia ka decomposition o ka hui colloidal HPMC. Ma 40 ℃, nalo loa ka leo nui o ka hui 300nm a decomposed i loko o nā ʻāpana liʻiliʻi o 15nm. Me ka hoʻonui hou ʻana o ka mahana, lilo ka HPMC i mau ʻāpana liʻiliʻi, a nalowale ka paʻa wai o ka gypsum slurry.

ʻO ke ʻano o ka hoʻololi ʻana o nā waiwai HPMC me ka piʻi ʻana o ka mahana ua ʻike ʻia ʻo ia he mau waiwai gel wela, ʻo ka ʻike maʻamau i kēia manawa ma kahi haʻahaʻa haʻahaʻa, hoʻopuehu mua ʻia nā macromolecules HPMC i loko o ka wai e hoʻoheheʻe i ka hopena, ʻo nā molekala HPMC i ke kiʻekiʻe kiʻekiʻe e hana i ka hui nui. . Ke piʻi ka mahana, hoʻonāwaliwali ka hydration o ka HPMC, hoʻokuʻu mālie ʻia ka wai ma waena o nā kaulahao, hoʻopuehu ʻia nā hui hui nui i loko o nā mea liʻiliʻi liʻiliʻi, hoʻemi ka viscosity o ka hopena, a hoʻokumu ʻia ka ʻōnaehana ʻekolu-dimensional i ka wā o ka gelation. hiki i ka mahana, a ua hoʻoheheʻe ʻia ka gel keʻokeʻo.

Ua ʻike ʻo Bodvik ua hoʻololi ʻia ka microstructure a me nā waiwai adsorption o HPMC i ka pae wai. Hui pu me Bulichen ka manaʻo o HPMC colloidal hui ālai slurry wai lawe ala ala, ua hoʻoholo 'ia i ka piʻi 'ana o ka wela alakai i ka disintegration o HPMC colloidal hui, ka hopena i ka emi o ka wai paʻa o hoʻololi gypsum.

3. Ka hopena

(1) ʻO ka cellulose ether ponoʻī ka viscosity kiʻekiʻe a me ka hopena "superimposed" me ka gypsum slurry, e pāʻani ana i kahi hopena mānoanoa. Ma ka lumi wela, ʻike ʻia ka hopena mānoanoa me ka piʻi ʻana o ka viscosity a me ke ʻano o ka cellulose ether. Eia nō naʻe, me ka piʻi ʻana o ka mahana, e emi ana ka viscosity o cellulose ether, nāwaliwali kona hopena mānoanoa, ʻoi aku ka maikaʻi o ke koʻikoʻi a me ka viscosity plastic gypsum mix, nāwaliwali ka pseudoplasticity, a ʻoi aku ka ʻino o ka waiwai.

(2) Ua hoʻomaikaʻi ʻo Cellulose ether i ka paʻa ʻana o ka wai o ka gypsum, akā me ka piʻi ʻana o ka mahana, ua emi nui ka paʻa ʻana o ka wai o ka gypsum i hoʻololi ʻia, ʻoiai ma 60 ℃ e nalowale loa ka hopena o ka paʻa wai. Ua hoʻomaikaʻi maikaʻi ʻia ka nui o ka mālama ʻana i ka wai o ka gypsum slurry e ka cellulose ether, a ʻo ka hoʻopaʻa ʻana o ka wai o ka HPMC gypsum slurry i hoʻololi ʻia me ka viscosity ʻokoʻa ua hiki i kahi saturation me ka piʻi ʻana o ka dosage. ʻO ka paʻa ʻana o ka wai Gypsum e like me ka viscosity o cellulose ether, ma ka viscosity kiʻekiʻe he liʻiliʻi ka hopena.

(3) ʻO nā mea i loko e hoʻololi ai i ka paʻa ʻana o ka wai o cellulose ether me ka mahana e pili kokoke ana i ka microscopic morphology o cellulose ether i ka pae wai. Ma kahi hoʻopaʻapaʻa, hoʻohui ʻia ka cellulose ether e hana i nā hui colloidal nui, e ālai ana i ke ala lawe wai o ka hui gypsum e hoʻokō i ka paʻa wai kiʻekiʻe. Eia nō naʻe, me ka piʻi ʻana o ka mahana, ma muli o ka waiwai gelation thermal o cellulose ether ponoʻī, hoʻomaka hou ka hui colloid nui i hana mua ʻia, e alakaʻi ana i ka emi ʻana o ka hana paʻa wai.