ʻO ka hopena mānoanoa oʻEtera cellulosehilinaʻi ʻia ma: ke kekelē o ka polymerization o ka cellulose ether, ka nui o ka hopena, ka wikiwiki o ka shear, ka mahana a me nā kūlana ʻē aʻe. ʻO ka waiwai gelling o ka hopena he mea kū hoʻokahi ia i ka alkyl cellulose a me kāna mau derivatives i hoʻololi ʻia. Pili nā waiwai gelation i ke kekelē o ka pani ʻana, ka nui o ka hopena a me nā mea hoʻohui. No nā derivatives i hoʻololi ʻia e ka hydroxyalkyl, pili pū nā waiwai gel i ke kekelē hoʻololi o ka hydroxyalkyl. No ka MC viscosity haʻahaʻa a me HPMC, hiki ke hoʻomākaukau ʻia ka hopena 10%-15%, hiki ke hoʻomākaukau ʻia ka MC viscosity waena a me HPMC i ka hopena 5%-10%, a hiki i ka MC viscosity kiʻekiʻe a me HPMC ke hoʻomākaukau wale i ka hopena 2%-3%, a ʻo ka maʻamau ka hoʻokaʻawale ʻana o ka viscosity o ka cellulose ether ua helu ʻia hoʻi me ka hopena 1%-2%.
Loaʻa i ka cellulose ether kaumaha-molekala kiʻekiʻe ka pono hoʻomānoanoa kiʻekiʻe, a ʻokoʻa nā viscosities o nā polymers me nā kaumaha molekala like ʻole i loko o ka hopena hoʻohui like. Hiki ke hoʻokō ʻia ka viscosity target ma ka hoʻohui ʻana i ka nui o ka cellulose ether kaumaha molekala haʻahaʻa. ʻAʻole pili iki kona viscosity i ka wikiwiki o ka shear, a hiki ka viscosity kiʻekiʻe i ka viscosity target, e koi ana i ka hoʻohui liʻiliʻi, a pili ka viscosity i ka pono hoʻomānoanoa. No laila, no ka hoʻokō ʻana i kahi kūlike, pono e hōʻoia ʻia kahi nui o ka cellulose ether (ka nui o ka hopena) a me ka viscosity hopena. Hoʻemi pū ka mahana gel o ka hopena me ka hoʻonui ʻana o ka nui o ka hopena, a me nā gels ma ka mahana o ka lumi ma hope o ka hiki ʻana i kahi nui. Kiʻekiʻe iki ka nui o ka gelling o HPMC ma ka mahana o ka lumi.
Hiki ke hoʻoponopono ʻia ke kūlike ma ke koho ʻana i ka nui o ka ʻāpana a me ke koho ʻana i nā ethers cellulose me nā kekelē like ʻole o ka hoʻololi ʻana. ʻO ka mea i kapa ʻia ʻo ka hoʻololi ʻana, ʻo ia ka hoʻokomo ʻana i kahi kekelē o ka pani ʻana o nā hui hydroxyalkyl ma ke ʻano iwi o MC. Ma ka hoʻololi ʻana i nā waiwai pani pili o nā mea pani ʻelua, ʻo ia hoʻi, nā waiwai pani pili DS a me MS o nā hui methoxy a me hydroxyalkyl a mākou e ʻōlelo pinepine ai. Hiki ke loaʻa nā koi hana like ʻole o ka cellulose ether ma ka hoʻololi ʻana i nā waiwai pani pili o nā mea pani ʻelua.
ʻO ka wai hoʻoheheʻe wai cellulose ether kiʻekiʻe-viscosity he thixotropy kiʻekiʻe, ʻo ia hoʻi kekahi ʻano nui o ka cellulose ether. ʻO nā wai hoʻoheheʻe wai o nā polymers MC he pseudoplastic a me ka non-thixotropic fluidity ma lalo o ko lākou mahana gel, akā ʻo nā waiwai kahe Newtonian ma nā wikiwiki shear haʻahaʻa. Hoʻonui ka Pseudoplasticity me ke kaumaha molekala a i ʻole ka nui o ka cellulose ether, me ka nānā ʻole i ke ʻano o ka substituent a me ke kekelē o ka pani ʻana. No laila, ʻo nā cellulose ethers o ka papa viscosity like, ʻaʻohe mea MC, HPMC, HEMC, e hōʻike mau i nā waiwai rheological like inā e mau ana ka nui a me ka mahana. Hoʻokumu ʻia nā gels structural i ka wā e hoʻokiʻekiʻe ʻia ai ka mahana, a loaʻa nā kahe thixotropic kiʻekiʻe. Hōʻike nā cellulose ethers kiʻekiʻe a me ka viscosity haʻahaʻa 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 ʻo ke kiʻekiʻe o ka viscosity oʻEtera cellulose, ʻoi aku ka maikaʻi o ka paʻa ʻana o ka wai, akā ʻo ke kiʻekiʻe o ka viscosity, ʻoi aku ke kiʻekiʻe o ke kaumaha molekala pili o ka cellulose ether, a me ka emi ʻana o kona solubility, kahi hopena maikaʻi ʻole i ka noʻonoʻo mortar a me ka hana kūkulu. ʻO ke kiʻekiʻe o ka viscosity, ʻoi aku ka maopopo o ka hopena mānoanoa ma ka mortar, akā ʻaʻole ia he kūlike loa. ʻO kekahi viscosity waena a me ka haʻahaʻa, akā ʻoi aku ka maikaʻi o ka hana o ka cellulose ether i hoʻololi ʻia i ka hoʻomaikaʻi ʻana i ka ikaika kūkulu o ka mortar pulu. Me ka hoʻonui ʻia o ka viscosity, hoʻomaikaʻi ka paʻa ʻana o ka wai o ka cellulose ether.
Ka manawa hoʻouna: ʻApelila-28-2024