Pehea e koho ai i ka hydroxypropyl methylcellulose no ka palaki plaster?

ʻO ka waiwai pH maʻamau o nā huahana gypsum he waikawa a kūlike ʻole paha. I kēia manawa aia ʻelua ʻano papa kūkuluhydroxypropyl methylcellulosema ka mākeke: cellulose hoʻoheheʻe lohi a me ka cellulose koke (S). ʻAʻole kūpono ka cellulose koke no nā ʻōnaehana gypsum. Nā huahana, ʻilihune loa ka solubility ma lalo o nā kūlana acidic a neutral paha, a hiki ke hoʻoheheʻe ʻia ka hydroxypropyl methylcellulose hoʻoheheʻe lohi i nā huahana gypsum, akā he hemahema koʻikoʻi ka cellulose hoʻoheheʻe lohi, maʻalahi ka hoʻohuihui (i ka wā e hoʻoulu ʻia ai ka gypsum ma ka paia no ka manawa pōkole, ʻike ʻia nā wahi granular liʻiliʻi ma ka ʻili). I kēia manawa, i nā huahana gypsum, ʻoi aku hoʻi i ka mortar gypsum i pīpī ʻia e ka mīkini, pono e hoʻopuehu piha ʻia ka cellulose ether a hoʻoheheʻe ʻia i loko o ka manawa pōkole loa, e koi ana iā mākou e hana i ka noiʻi hohonu i ke kaʻina hana hana cellulose ether hoʻoheheʻe lohi. ʻO ka mālama ʻana i ka ʻili (ʻaʻole ka mea i kapa ʻia ʻo ka hoʻohui ʻana o nā mea hoʻohui ʻē aʻe i ka cellulose ether maʻamau), i mea e hoʻololi ai i ka ʻōnaehana mortar gypsum. Hiki i ka Hydroxypropyl methylcellulose ether me ka mālama ʻana i ka ʻili hohonu ke loaʻa ka manawa hoʻoheheʻe paʻa a me nā waiwai mechanical maikaʻi i ka mortar gypsum, a hiki ke hoʻomaikaʻi nui i ke kaʻina hana pae a me ka hoʻopau ʻana o ka mortar.

Hoʻohana pinepine ka mīkini i ka hydroxypropyl methylcellulose ether haʻahaʻa ka viscosity ma waena o 20,000 a me 75,000, a ʻo ka nui o ka hoʻohui ʻana he 0.2% a 0.4%. Hoʻomalu ʻia ka manawa hoʻonohonoho o ka mīkini i ka mīkini i ka gypsum mortar ma kahi o 1 hola. Hoʻohana mākou i ke kaumaha o ka yield stress gypsum mortar, ka viscosity plastic, thixotropy, rheology a me ke kūlike o ka slurry e hoʻoholo ai i ka hana o nā huahana gypsum mortar.

Ke noʻonoʻo nei mākou i ka kaohi maikaʻi o ke kaʻina hana calcining kumu gypsum desulfurization, nā mea hoʻopihapiha (sima, ʻāpana maikaʻi, pauka calcium kaumaha) a me nā admixtures (hiki ke hoʻohana ʻia i ka pauka latex disperse, hydroxypropyl methyl cellulose ether, perlite hoʻonui ʻia, gypsum retarder) ʻO ke koho ʻana o ke ʻano huahana holoʻokoʻa he kumukūʻai kūpono.

ʻEtera hydroxypropyl methyl celluloseno ka mea, he maʻemaʻe kiʻekiʻe ka mortar gypsum a me ka hana maikaʻi, a ua mahalo nui ʻia e nā mea kūʻai aku gypsum mortar.