ʻO ka hopena mānoanoa o ka cellulose ether e pili ana i: ka degere o ka polymerization o ka cellulose ether, ka hoʻonā hopena, ka nui o ka shear, 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% solution hiki ke hoʻomākaukau, medium viscosity MC a me HPMC hiki ke hoʻomākaukau i ka 5% -10% solution, a me ka viscosity MC a me HPMC hiki ke hoʻomākaukau wale i ka 2% -3% solution, a maʻamau. ʻO ka helu viscosity o ka cellulose ether ua helu pū ʻia me ka hopena 1% -2%.
High-molecular-weight cellulose ether he kiʻekiʻe mānoanoa ka pono, a me nā polymers me nā kaumaha molecular ʻokoʻa i nā viscosities like ʻole i ka hopena hoʻohālikelike like.Hiki ke hoʻokō ʻia ka viscosity target ma o ka hoʻohui ʻana i ka nui o ka cellulose ether kaumaha haʻahaʻa.ʻO kona viscosity he mea liʻiliʻi ka hilinaʻi ma ka shear rate, hiki i ka viscosity kiʻekiʻe i ka viscosity target, a he liʻiliʻi ka nui o ka hoʻohui ʻana, a ʻo ka viscosity e pili ana i ka pono thickening.No laila, no ka hoʻokō ʻana i kahi kūlike, pono e hōʻoia i 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.
Hiki ke hoʻololi ʻia ke kūlike ma ke koho ʻana i ka nui o ka ʻāpana a me ke koho ʻana i nā cellulose ethers me nā pae like ʻole o ka hoʻololi.ʻO ka mea i kapa ʻia ʻo ka hoʻololi ʻana ʻo ia ka hoʻokomo ʻana i kahi pae o ka hoʻololi ʻana o nā pūʻulu hydroxyalkyl ma ke ʻano iwi o MC.Ma ka hoʻololi ʻana i nā waiwai hoʻololi pili o nā mea pani ʻelua, ʻo ia hoʻi, nā waiwai hoʻololi pili pili DS a me MS o nā pūʻulu methoxy a me hydroxyalkyl a mākou e ʻōlelo pinepine ai.Hiki ke loaʻa nā koi hana like ʻole o ka cellulose ether ma o ka hoʻololi ʻana i nā waiwai hoʻololi pili o nā mea pani ʻelua.
Loaʻa ka thixotropy kiʻekiʻe o ka cellulose ether aqueous solution, ʻo ia hoʻi kahi ʻano nui o ka cellulose ether.Loaʻa ka wai wai o nā polimer MC i ka wai pseudoplastic a me ka non-thixotropic ma lalo o ko lākou wela gel, akā nā waiwai kahe o Newtonian ma nā ʻāpana ʻoki haʻahaʻa.Hoʻonui ka Pseudoplasticity me ka paona molekala a i ʻole ka ʻike ʻana o ka cellulose ether, me ka nānā ʻole i ke ʻano o ka mea pani a me ke degere o ka hoʻololi.No laila, e hōʻike mau ana nā cellulose ethers o ka pae viscosity like, ʻaʻohe mea MC, HPMC, HEMC, i nā ʻano rheological like i ka wā e mālama mau ʻia ka ʻike a me ka mahana.Hoʻokumu ʻia nā gels Structural i ka wā e piʻi aʻe ai ka mahana, a hiki mai nā kahe thixotropic kiʻekiʻe.Hōʻike ka ʻike kiʻekiʻe a me ka haʻahaʻa viscosity cellulose ethers i ka thixotropy ma lalo o ka mahana gel.He pōmaikaʻi nui kēia waiwai i ka hoʻoponopono ʻana i ka pae ʻana a me ka sagging i ke kūkulu ʻana i ka mortar hale.
Pono e wehewehe ʻia ma ʻaneʻi, ʻoi aku ka kiʻekiʻe o ka viscosity o cellulose ether, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai, akā ʻoi aku ka kiʻekiʻe o ka viscosity, ʻoi aku ka kiʻekiʻe o ke kaumaha o ka cellulose ether, a me ka emi ʻana o kona solubility, he hopena maikaʻi ʻole. e pili ana i ka hoʻopaʻa ʻana o ka mortar a me ka hana hana.ʻO ke kiʻekiʻe o ka viscosity, ʻoi aku ka maopopo o ka hopena mānoanoa ma ka mortar, akā ʻaʻole ia i kūlike loa.ʻO kekahi haʻahaʻa haʻahaʻa a me ka viscosity, akā ʻoi aku ka maikaʻi o ka cellulose ether i hoʻololi ʻia i ka hoʻomaikaʻi ʻana i ka ikaika o ka mortar pulu.Me ka piʻi ʻana o ka viscosity, hoʻomaikaʻi ka paʻa wai o ka cellulose ether.
Ka manawa hoʻouna: Mar-20-2023