Hiki i ka cellulose ether ke hoʻomaikaʻi maikaʻi i ka hana o ka mortar pulu, a he mea hoʻohui nui e pili ana i ka hana hana o ka mortar. ʻO ke koho kūpono o nā cellulose ethers o nā ʻano ʻano like ʻole, nā viscosities like ʻole, nā ʻāpana ʻokoʻa like ʻole, nā degere like ʻole o ka viscosity a me nā nui i hoʻohui ʻia e loaʻa i ka hopena maikaʻi i ka hoʻomaikaʻi ʻana i ka hana o ka mortar pauka maloʻo. I kēia manawa, nui ʻole ka hana ʻana o ka paʻa ʻana o ka wai i ka nui o nā masonry a me ka plastering morta, a e kaʻawale ka slurry wai ma hope o kekahi mau minuke o ke kū ʻana. ʻO ka mālama ʻana i ka wai he hana koʻikoʻi ia o ka methyl cellulose ether, a he hana hoʻi ia i ka nui o nā mea hana mortar maloʻo maloʻo, ʻoi aku ka poʻe ma nā ʻāpana hema me nā mahana kiʻekiʻe. ʻO nā mea e pili ana i ka hopena paʻa wai o ka mortar pauka maloʻo e pili ana i ka nui o ka hoʻohui, viscosity, fineness o nā ʻāpana, a me ka mahana o ka hoʻohana ʻana.
Ka paʻa wai o ka cellulose ether
I ka hana ʻana i nā mea kūkulu hale, ʻoi aku hoʻi i ka mortar pauka maloʻo, cellulose ether kahi hana i hiki ʻole ke hoʻololi ʻia, ʻoi aku hoʻi i ka hana ʻana i ka mortar kūikawā (modified mortar), he mea nui a koʻikoʻi. ʻO ka hana koʻikoʻi o ka wai-soluble cellulose ether i loko o ka mortar he ʻekolu mau ʻano, ʻo kekahi ka mana paʻa wai maikaʻi loa, ʻo ka mea ʻē aʻe ka mana i ka kūlike a me ka thixotropy o ka mortar, a ʻo ke kolu ka pilina me ka sima. ʻO ka hopena paʻa wai o ka cellulose ether e pili ana i ka hoʻopili ʻana o ka wai o ka papa kumu, ka hoʻohui ʻana o ka mortar, ka mānoanoa o ka mortar layer, ke koi wai o ka mortar, a me ka manawa hoʻonohonoho o ka mea hoʻonohonoho. ʻO ka paʻa ʻana o ka wai o cellulose ether ponoʻī mai ka solubility a me ka dehydration o cellulose ether ponoʻī. E like me kā mākou i ʻike ai, ʻoiai ʻo ka cellulose molecular chain ka nui o nā pūʻulu OH hydratable, ʻaʻole hiki ke hoʻoheheʻe ʻia i ka wai, no ka mea, he kiʻekiʻe ke kiʻekiʻe o ka crystallinity o ka hale cellulose. ʻAʻole lawa ka hiki hydration o nā pūʻulu hydroxyl wale nō e uhi i nā paʻa hydrogen ikaika a me nā kaha van der Waals ma waena o nā mole. No laila, pehu wale ia akā ʻaʻole hoʻoheheʻe i ka wai. Ke hoʻokomo ʻia kahi mea pani i loko o ke kaulahao molekala, ʻaʻole ʻo ka mea pani wale nō e hoʻopau i ke kaulahao hydrogen, akā ua luku ʻia hoʻi ka pilina hydrogen interchain ma muli o ka wili ʻana o ka mea pani ma waena o nā kaulahao pili. ʻO ka nui o ka mea pani, ʻoi aku ka nui o ka mamao ma waena o nā mole. ʻOi aku ka mamao. ʻO ka nui o ka hopena o ka luku ʻana i nā paʻa hydrogen, lilo ka cellulose ether i ka wai-soluble ma hope o ka hoʻonui ʻana o ka lattice cellulose a komo ka hopena, e hana ana i kahi hopena kiʻekiʻe-viscosity. Ke piʻi ka mahana, nāwaliwali ka hydration o ka polymer, a kipaku ʻia ka wai ma waena o nā kaulahao. I ka lawa ʻana o ka hopena dehydration, hoʻomaka nā molekala e hōʻuluʻulu, e hana ana i kahi gel hoʻonohonoho ʻoihana ʻekolu-dimensional a pelu ʻia.
ʻO ka ʻōlelo maʻamau, ʻoi aku ka kiʻekiʻe o ka viscosity, ʻoi aku ka maikaʻi o ka hopena paʻa wai. Eia nō naʻe, ʻoi aku ka kiʻekiʻe o ka viscosity a me ke kiʻekiʻe o ke kaumaha molekala, ʻo ka emi ʻana o kona solubility e loaʻa i ka hopena maikaʻi ʻole i ka ikaika a me ka hana ʻana o ka mīkini. ʻO ke kiʻekiʻe o ka viscosity, ʻoi aku ka maopopo o ka hopena mānoanoa ma ka mortar, akā ʻaʻole pololei ia. ʻO ke kiʻekiʻe o ka viscosity, ʻoi aku ka viscous o ka mortar pulu, ʻo ia hoʻi, i ka wā o ke kūkulu ʻana, ʻike ʻia ʻo ia e pili ana i ka scraper a me ka hoʻopili kiʻekiʻe i ka substrate. Akā ʻaʻole kōkua ka hoʻonui ʻana i ka ikaika o ke kūkulu ʻana o ka mortar pulu ponoʻī. I ka wā o ke kūkulu ʻana, ʻaʻole maopopo ka hana anti-sag. Ma kahi ʻē aʻe, ʻoi aku ka maikaʻi o ka hoʻomaikaʻi ʻana i ka ikaika o ka mortar pulu.
ʻO ka mānoanoa a me ka Thixotropy o Cellulose Etera
Aia kekahi pilina laina maikaʻi ma waena o ke kūlike o ka paʻi sima a me ke ʻano o ka cellulose ether. Hiki i ka cellulose ether ke hoʻonui nui i ka viscosity o ka mortar. ʻO ka nui o ka dosage, ʻoi aku ka maopopo o ka hopena. Loaʻa ka thixotropy kiʻekiʻe o ka cellulose ether aqueous solution, ʻo ia hoʻi kahi ʻano nui o ka cellulose ether.
ʻO ka mānoanoa e pili ana i ke kiʻekiʻe o ka polymerization o cellulose ether, ka hoʻonā hopena, ka shear rate, ka mahana a me nā kūlana ʻē aʻe. He kū hoʻokahi ka waiwai gelling o ka hopena i ka alkyl cellulose a me kāna mau mea i hoʻololi ʻia. ʻO nā waiwai gelation e pili ana i ke kiʻekiʻe o ka hoʻololi, ka hoʻonā hoʻonā a me nā mea hoʻohui. No nā derivatives hoʻololi hydroxyalkyl, pili pū nā waiwai gel i ka pae hoʻololi o ka hydroxyalkyl. No ka haʻahaʻa viscosity MC a me HPMC, 10% -15% hoʻonā hiki ke hoomakaukau, waena viscosity MC a me HPMC hiki ke hoomakaukau 5% -10% solution, oiai kiʻekiʻe viscosity MC a me HPMC hiki ke hoomakaukau wale 2% -3% solution, a maʻamau. ʻO ka viscosity classification o cellulose ether ua helu pū ʻia e 1% -2% solution. High molecular kaumaha cellulose etera i kiʻekiʻe thickening pono. I loko o ka hoʻonā hoʻonaʻauao hoʻokahi, ʻokoʻa nā polymers me nā kaupaona molekala like ʻole. Degere kiʻekiʻe. Hiki ke hoʻokō ʻia ka viscosity target ma ka hoʻohui ʻana i ka nui o ka cellulose ether molecular haʻahaʻa haʻahaʻa. Kona viscosity i uuku hilinaʻi ma luna o ka shear rate, a hiki i ka viscosity kiʻekiʻe i ka viscosity pahupaʻiwikiō, a me ka mea i koi 'ia he uuku, a me ka viscosity hilinaʻi ma luna o ka thickening pono. No laila, no ka hoʻokō ʻana i kahi kūlike, pono e hōʻoia ʻia kahi nui o ka cellulose ether (concentration of the solution) a me ka viscosity solution. ʻO ka mahana gel o ka hopena e emi iho ana me ka hoʻonuiʻia o ka hoʻonāʻana o ka hopena, a me nā gels i ka mahana wela ma hope o ka hikiʻana i kahi hoʻolālā. He kiʻekiʻe ka ʻike gelling o HPMC ma ka lumi wela.
Hoʻopaneʻe i ka Cellulose Etera
ʻO ke kolu o ka hana o ka cellulose ether e hoʻopaneʻe i ka hana hydration o ka sima. Hāʻawi ka cellulose ether i ka mortar me nā waiwai pono like ʻole, a hoʻemi pū i ka wela hydration mua o ka sima a hoʻopaneʻe i ke kaʻina hana hydration o ka sima. He mea maikaʻi ʻole kēia no ka hoʻohana ʻana i ka mortar ma nā wahi anuanu. Hoʻokumu ʻia kēia hopena hoʻihoʻi ma muli o ka adsorption o nā molekole cellulose ether ma nā huahana hydration e like me CSH a me ca(OH)2. Ma muli o ka piʻi ʻana o ka viscosity o ka solution pore, hoʻemi ka cellulose ether i ka neʻe ʻana o nā ion i loko o ka hopena, a laila e hoʻopaneʻe i ke kaʻina hydration. ʻOi aku ka kiʻekiʻe o ka cellulose ether i loko o ka mineral gel material, ʻoi aku ka maikaʻi o ka hopena o ka hydration lohi. ʻAʻole hoʻopaneʻe wale ka cellulose ether i ka hoʻonohonoho ʻana, akā hoʻopaneʻe hoʻi i ke kaʻina hana paʻakikī o ka ʻōnaehana sima. ʻAʻole hilinaʻi wale ka hopena o ka cellulose ether i kona ʻike ʻana i ka ʻōnaehana gel mineral, akā i ke ʻano kemika. ʻO ke kiʻekiʻe o ke kiʻekiʻe o ka methylation o HEMC, ʻoi aku ka maikaʻi o ka hopena retarding o cellulose ether. ʻO ka lakio o ka hydrophilic substitution i ka wai-hoʻonui substitution ʻOi aku ka ikaika o ka hopena retarding. Eia naʻe, liʻiliʻi ka hopena o ka viscosity o cellulose ether i nā kinetics hydration cement.
I loko o ka mortar, hoʻokani ka cellulose ether i ka paʻa ʻana o ka wai, ka mānoanoa, ka lohi ʻana i ka mana hydration cement, a me ka hoʻomaikaʻi ʻana i ka hana hana. ʻO ka mana paʻa wai maikaʻi e hoʻopiha piha ai i ka hydration sima, hiki ke hoʻomaikaʻi i ka viscosity pulu o ka mortar pulu, hoʻonui i ka ikaika paʻa o ka mortar, a hoʻoponopono i ka manawa. ʻO ka hoʻohui ʻana i ka cellulose ether i ka mīkini hoʻoheheʻe ʻana i ka mīkini hiki ke hoʻomaikaʻi i ka hana ʻana a i ʻole ka pahū ʻana a me ka ikaika o ke kūkulu ʻana o ka mortar. No laila, ke hoʻohana nui ʻia nei ka cellulose ether ma ke ʻano he mea hoʻohui koʻikoʻi i ka mortar i hoʻomākaukau ʻia
Ka manawa hoʻouna: Dec-26-2022