ʻO ka viscosity kahi mea waiwai nui o ka cellulose ether. ʻO ka ʻōlelo maʻamau, ʻoi aku ka kiʻekiʻe o ka viscosity, ʻoi aku ka maikaʻi o ka hopena paʻa wai o ka gypsum mortar. Eia nō naʻe, ʻoi aku ka kiʻekiʻe o ka viscosity, ʻoi aku ka kiʻekiʻe o ke kaumaha molecular o cellulose ether, a e emi iho ka solubility o cellulose ether. ʻO ke kiʻekiʻe o ka viscosity, ʻoi aku ka maopopo o ka hopena mānoanoa, akā ʻaʻole like ia. ʻO ke kiʻekiʻe o ka viscosity, ʻoi aku ka paʻa o ka mortar pulu, i ka hana ʻana, ka hana o ka sticking scraper a me ke kiʻekiʻe adhesion i ka substrate. Akā ʻaʻole kōkua ka hoʻonui ʻana i ka ikaika o ke kūkulu ʻana o ka mortar pulu ponoʻī. Eia kekahi, i ka wā o ke kūkulu ʻana, ʻaʻole maopopo ka hana ʻana o ka hana anti-sagging mortar. ʻO ka ʻokoʻa, ʻo kekahi Methyl cellulose i hoʻololi ʻia me ka haʻahaʻa haʻahaʻa a me ka haʻahaʻa haʻahaʻa i hōʻike ʻia i ka hoʻomaikaʻi ʻana i ka ikaika o ke kūkulu ʻana o ka mortar pulu. ʻO nā mea pā hale ka hapa nui o nā hale porous, loaʻa iā lākou ka wai. A ʻo nā mea kūkulu hale gypsum i hoʻohana ʻia no ke kūkulu ʻana i ka pā, ma hope o ka hoʻohui ʻana i ka modulation wai ma ka paia, ua maʻalahi ka hoʻopili ʻia e ka pā, e hoʻoneʻe ai ka gypsum i ka wai e pono ai no ka hydration, e hoʻopilikia i ka hana plastering a hoʻemi i ka ikaika paʻa. , no laila aia nā māwae, pahu pahu, spalling a me nā pilikia maikaʻi ʻē aʻe. ʻO ka hoʻomaikaʻi ʻana i ka mālama ʻana i ka wai o nā mea hale gypsum hiki ke hoʻoponopono i ka pilikia o ka maikaʻi o ke kūkulu ʻana a hoʻomaikaʻi i ka ikaika paʻa me ka pā. No laila, ua lilo ka mea mālama wai i kekahi o nā mea hoʻohui koʻikoʻi o nā mea kūkulu hale gypsum.
I mea e maʻalahi ai ke kūkulu ʻana, ua hoʻohana ʻia nā mea pauka hale e like me ka plaster, adhesive plaster, jointing plaster a me plaster putty, a ua hoʻohui ʻia ka gypsum retarder i ka hana e hoʻolōʻihi i ka manawa hana o ka plaster paste, no ka mea ke kaʻina hana hydration o ka hemihydrate. Kāohi ʻia ka gypsum ma ka hoʻohui ʻana i ka retarder i ka gypsum, pono e noho kēia ʻano paʻi gypsum ma ka paia no 1-2 mau hola ma mua o ka hoʻonohonoho ʻana, a ʻo ka hapa nui o nā paia he waiwai hoʻoheheʻe wai, ʻo ia hoʻi, nā mea pā māmā hou e like me nā pā pōhaku. ʻO nā paia pāpaʻa aerated, nā panela hoʻoheheʻe wela wela, no laila e hoʻokō i ka mālama ʻana i ka mālama ʻana i ka wai o ka gypsum slurry, e pale aku i ka hoʻoili ʻana o kekahi o ka slurry wai i ka paia, ke kumu o ka paʻa ʻana o ka gypsum paste i ka wā o ka nele o ka wai, ʻaʻole i pau ka hydration. , kumu i ka gypsum a me ka paia ili ami wahi kaawale, ka pūpū. ʻO ka hoʻohui ʻana i ka mea mālama wai ʻo ia ka mālama ʻana i ka wai i loko o ka paʻi gypsum, e hōʻoia i ka hopena hydration o ka paʻi gypsum ma ka interface, pēlā e hōʻoia ai i ka ikaika paʻa. ʻO nā mea mālama wai maʻamau he cellulose ethers, e like me Methyl cellulose (MC) , hypromellose (HPMC), hydroxyethyl methyl cellulose (HEMC), etc. Eia kekahi, hiki ke hoʻohana ʻia ka polyvinyl alcohol, sodium alginate, starch i hoʻololi ʻia, diatomite a me ka pauka honua e hoʻomaikaʻi ai i ka mālama ʻana i ka wai.
Ka manawa hoʻouna: Iulai-26-2023