ʻO nā hui hydroxyl macellulose eteraʻO nā molekala a me nā ʻātoma oxygen ma nā paʻa etera e hana i nā paʻa hydrogen me nā molekele wai, e hoʻohuli i ka wai manuahi i wai paʻa, no laila e pāʻani maikaʻi ana i ka mālama ʻana i ka wai; ʻO ka hoʻoheheʻe like ʻana ma waena o nā molekala wai a me nā kaulahao moleki cellulose ether e hiki ai i nā molekole wai ke komo i loko o ke kaulahao macromolecular cellulose ether a kau ʻia i nā kaohi ikaika, a laila e hana ai i ka wai manuahi a me ka wai i hoʻopili ʻia, e hoʻomaikaʻi ai i ka paʻa ʻana o ka wai o ka slurry sima; Hoʻomaikaʻi ʻo cellulose ether i nā waiwai rheological, ʻano pūnaewele porous a me ke kaomi osmotic o ka slurry cement hou a i ʻole nā mea hana kiʻiʻoniʻoni o cellulose ether e pale i ka laha ʻana o ka wai.
ʻO ka paʻa ʻana o ka wai o cellulose ether ponoʻī mai ka solubility a me ka dehydration o cellulose ether ponoʻī. ʻAʻole lawa ka mana hydration o nā pūʻulu hydroxyl wale nō e uku i nā paʻa hydrogen ikaika a me nā pūʻali van der Waals ma waena o nā molekala, no laila ʻo ia wale nō ka pehu akā ʻaʻole e hoʻoheheʻe i ka wai. Ke hoʻokomo ʻia nā mea pani i loko o ke kaulahao molekula, ʻaʻole wale nā mea pani e hoʻopau i nā kaulahao hydrogen, akā ua luku pū ʻia nā paʻa hydrogen interchain ma muli o ka wili ʻana o nā mea pani ma waena o nā kaulahao pili. ʻO ka nui o nā mea pani, ʻoi aku ka nui o ka mamao ma waena o nā molekala, a ʻoi aku ka hopena o ka luku ʻana i nā paʻa hydrogen. Ma hope o ka'ōhūʻana o ka cellulose lattice, komo ka hopena, a lilo ka cellulose ether i ka wai-soluble, e hana ana i kahi hopena kiʻekiʻe-viscosity, a laila e pāʻani i ka mālama wai.
Nā mea e pili ana i ka hana mālama wai:
Viscosity: ʻOi aku ka nui o ka viscosity o cellulose ether, ʻoi aku ka maikaʻi o ka hana paʻa ʻana o ka wai, akā ʻoi aku ka kiʻekiʻe o ka viscosity, ʻoi aku ka kiʻekiʻe o ke kaumaha molecular pili o cellulose ether, a ua emi kona solubility e like me ia, he hopena maikaʻi ʻole ia i ka hana a me ke kūkulu ʻana. o ka hamo. ʻO ka mea maʻamau, no ka huahana like, ʻokoʻa loa nā hopena viscosity i ana ʻia e nā ʻano like ʻole, no laila ke hoʻohālikelike ʻia ka viscosity, pono e hana ʻia ma waena o nā ʻano hoʻokolohua like (me ka mahana, rotor, etc.).
ʻO ka nui o ka cellulose ether i hoʻohui ʻia i ka mortar, ʻoi aku ka maikaʻi o ka hana mālama wai. ʻO ka maʻamau, hiki i kahi liʻiliʻi o ka cellulose ether ke hoʻomaikaʻi nui i ka pae paʻa wai o ka mortar. Ke piʻi ka nui i kahi pae, e lohi ke ʻano o ka hoʻonui ʻana i ka paʻa wai.
ʻOi aku ka maikaʻi o nā ʻāpana, ʻoi aku ka maikaʻi o ka mālama ʻana i ka wai. Ke hoʻopili ʻia nā ʻāpana nui o ka cellulose ether me ka wai, e hoʻoheheʻe koke ka ʻili a hana i kahi gel e hoʻopili ai i ka mea e pale ai i nā molekala wai mai ka hoʻomau ʻana i ke komo ʻana. I kekahi manawa, ʻaʻole hiki i ka hoʻoulu ʻana i ka wā lōʻihi ke hoʻokō i ka hoʻopuehu like ʻana a me ka hoʻoheheʻe ʻana, e hana ana i kahi hopena flocculent turbid a i ʻole agglomeration, e hoʻopilikia nui i ka paʻa ʻana o ka wai o ka cellulose ether. ʻO ka solubility kekahi o nā kumu no ke koho ʻana i ka cellulose ether. He hōʻailona hana koʻikoʻi ka Fineness o ka methyl cellulose ether. Pili ka fineness i ka solubility o ka methyl cellulose ether. ʻO Coarser MC ka mea maʻamau a hiki ke hoʻoheheʻe ʻia i ka wai me ka ʻole o ka agglomeration, akā lohi loa ka helu dissolution a ʻaʻole kūpono ia no ka hoʻohana ʻana i ka mortar maloʻo.
Ka Mahana: Ke piʻi aʻe ka mahana ambient, e emi maʻamau ka paʻa ʻana o ka wai o nā cellulose ethers, akā ʻo kekahi mau cellulose ethers i hoʻololi ʻia he paʻa wai maikaʻi ma lalo o nā kūlana wela kiʻekiʻe; i ka piʻi ʻana o ka mahana, nāwaliwali ka hydration o nā polymers, a hoʻokuʻu ʻia ka wai ma waena o nā kaulahao. I ka lawa ʻana o ka wai maloʻo, hoʻomaka nā molekala e hōʻuluʻulu e hana i kahi gel hoʻolālā pūnaewele ʻekolu.
ʻO ke ʻano molekala: ʻO nā eter cellulose me ka hoʻololi haʻahaʻa i ʻoi aku ka maikaʻi o ka mālama ʻana i ka wai.
ʻO ka mānoanoa a me ka thixotropy
mānoanoa:
Ka hopena i ka hiki ke hoʻopaʻa a me ka hana anti-sagging: Hāʻawi nā cellulose ethers i ka mortar wet viscosity maikaʻi loa, hiki ke hoʻonui nui i ka hiki ke hoʻopaʻa ʻia o ka mortar pulu me ka papa kumu a hoʻomaikaʻi i ka hana anti-sagging o ka mortar. Hoʻohana nui ʻia ia i ka plastering mortar, tile hoʻopaʻa ʻana i ka mortar a me ka ʻōnaehana insulation pā waho 3.
Ka hopena i ka homogeneity mea: ʻO ka hopena mānoanoa o nā cellulose ethers hiki ke hoʻonui i ka mana anti-dispersion a me ka homogeneity o nā mea hou i hui pū ʻia, pale i ka stratification mea, ka hoʻokaʻawale ʻana a me ka seepage wai, a hiki ke hoʻohana ʻia i loko o ka fiber concrete, underwater concrete and self-compacting concrete. .
Ke kumu a me ka mana o ka hopena mānoanoa: ʻO ka hopena mānoanoa o ka cellulose ether ma luna o nā mea sima mai ka viscosity o ka cellulose ether solution. Ma lalo o nā kūlana like, ʻoi aku ka kiʻekiʻe o ka viscosity o cellulose ether, ʻoi aku ka maikaʻi o ka viscosity o nā mea i hoʻololi ʻia i ka sima, akā inā kiʻekiʻe loa ka viscosity, e hoʻopili ia i ka wai a me ka operability o ka mea (e like me ka pili ʻana i ka pahi plastering. ). ʻO ka mortar hoʻopaʻa ponoʻī a me ka paʻa paʻa ponoʻī me nā koi fluidity kiʻekiʻe e koi i ka viscosity haʻahaʻa o cellulose ether. Eia kekahi, ʻo ka hopena mānoanoa o ka cellulose ether e hoʻonui i ka koi wai o nā mea i hoʻokumu ʻia i ka sima a hoʻonui i ka puka o ka mortar.
Thixotropy:
Loaʻa ka thixotropy kiʻekiʻe o ka cellulose ether aqueous solution, ʻo ia hoʻi kahi ʻano nui o ka cellulose ether. He pseudoplasticity ka wai o ka methyl cellulose a me ka wai non-thixotropic ma lalo o kona wela gel, akā e hōʻike ana i nā waiwai kahe o Newtonian ma nā uku ʻoki haʻahaʻa. Hoʻonui ka Pseudoplasticity me ka piʻi ʻana o ka cellulose ether molecular paona a i ʻole ka hoʻopaʻa ʻana, ʻaʻohe mea pili i ke ʻano o ka substituent a me ke degere o ka hoʻololi. No laila, ʻo nā cellulose ethers o ka papa viscosity like, inā he MC, HPMC, a i ʻole HEMC, e hōʻike mau i nā waiwai rheological like me ka lōʻihi o ka hoʻopaʻa ʻana a me ka mahana. Ke piʻi ka mahana, hoʻokumu ʻia kahi gel structural, a hele mai kahi kahe thixotropic kiʻekiʻe. Hōʻike nā cellulose ethers me ka ʻike kiʻekiʻe a me ka viscosity haʻahaʻa i ka thixotropy ma lalo o ka mahana gel. He mea maikaʻi loa kēia waiwai no ka hoʻoponopono ʻana i ka pae a me ka sagging o ke kūkulu hale i ka wā o ke kūkulu ʻana.
Hoʻokomo ea
Ke kumu a me ka hopena ma ka hana hana: He hopena koʻikoʻi ko ka cellulose ether e hoʻokomo i ka ea ma nā mea hana sima hou. Loaʻa i ka cellulose ether nā pūʻulu hydrophilic (nā pūʻulu hydroxyl, nā pūʻulu ether) a me nā pūʻulu hydrophobic (nā pūʻulu methyl, nā apo glucose). He surfactant me ka hana ili, no laila ke loaʻa ka hopena entrainment ea. ʻO ka hopena entrainment ea e hoʻopuka i kahi hopena pōleʻa, hiki ke hoʻomaikaʻi i ka hana hana o nā mea hou i hui pū ʻia, e like me ka hoʻonui ʻana i ka plasticity a me ka maʻalahi o ka mortar i ka wā o ka hana, kahi mea e pono ai ka hoʻolaha ʻana o ka mortar; e hoʻonui hoʻi ia i ka hoʻopuka o ka mortar a hoʻemi i ke kumukūʻai hana o ka mortar.
Ka hopena i nā waiwai mechanical: E hoʻonui ka hopena o ka ea i ka porosity o ka mea paʻakikī a hoʻemi i kona mau mea mechanical e like me ka ikaika a me ka modulus elastic.
Ka hopena i ka wai: Ma ke ʻano he surfactant, cellulose ether kekahi i ka pulu a i ʻole ka lubricating hopena ma nā ʻāpana sima, a me kāna hopena entraining ea e hoʻonui ai i ka wai o nā mea i hoʻokumu ʻia i ka sima, akā ʻo kona hopena mānoanoa e hōʻemi i ka wai. ʻO ka hopena o ka cellulose ether i ka wai o nā mea i hoʻokumu ʻia i ka cement he hui pū ʻana o ka plasticizing a me nā hopena mānoanoa. ʻO ka ʻōlelo maʻamau, inā haʻahaʻa loa ke ʻano o ka cellulose ether, ʻike ʻia ʻo ia ma ke ʻano he plasticizing a i ʻole nā hopena hoʻēmi wai; ke kiʻekiʻe ka dosage, piʻi wikiwiki ka hopena mānoanoa o ka cellulose ether, a ʻo kona hopena entraining ea e hoʻopiha ʻia, no laila e hōʻike ʻia e like me ka mānoanoa a hoʻonui paha i ka koi wai.
Ka manawa hoʻouna: Dec-23-2024