Ka hana o ka cellulose ether i loko o ka mortar

ʻO ka Cellulose ether kahi polymer synthetic i hana ʻia mai ka cellulose kūlohelohe ma o ka hoʻololi kemika. ʻO ka Cellulose ether kahi derivative o ka cellulose kūlohelohe. ʻOkoʻa ka hana ʻana o ka cellulose ether mai nā polymers synthetic. ʻO kāna mea kumu nui loa ʻo cellulose, kahi hui polymer kūlohelohe. Ma muli o ke ʻano kūikawā o ke ʻano cellulose kūlohelohe, ʻaʻohe hiki o ka cellulose ponoʻī ke hana me nā mea etherification. Eia naʻe, ma hope o ka mālama ʻana i ka mea pehu, ua luku ʻia nā pilina hydrogen ikaika ma waena o nā kaulahao molekala a me nā kaulahao, a lilo ka hoʻokuʻu ikaika o ka hui hydroxyl i cellulose alkali reactive. E kiʻi i ka cellulose ether.

I loko o ka mortar hui mākaukau, he haʻahaʻa loa ka nui o ka cellulose ether i hoʻohui ʻia, akā hiki iā ia ke hoʻomaikaʻi nui i ka hana o ka mortar pulu, a he mea hoʻohui nui ia e hoʻopilikia i ka hana kūkulu o ka mortar. ʻO ke koho kūpono o nā cellulose ethers o nā ʻano like ʻole, nā viscosities like ʻole, nā nui ʻāpana like ʻole, nā kekelē like ʻole o ka viscosity a me nā nui i hoʻohui ʻia e loaʻa ka hopena maikaʻi i ka hoʻomaikaʻi ʻana i ka hana o ka mortar pauka maloʻo. I kēia manawa, he nui nā mortar masonry a me plastering i loaʻa ka hana paʻa wai maikaʻi ʻole, a e hoʻokaʻawale ka slurry wai ma hope o kekahi mau minuke o ke kū ʻana.

ʻO ka paʻa ʻana o ka wai kahi hana koʻikoʻi o ka methyl cellulose ether, a he hana nō hoʻi ia e nānā nui ʻia e nā mea hana mortar maloʻo kūloko, ʻoiai ka poʻe ma nā ʻāina hema me nā mahana kiʻekiʻe. ʻO nā mea e pili ana i ka hopena paʻa wai o ka mortar maloʻo e komo pū ana me ka nui o ka MC i hoʻohui ʻia, ka mānoanoa o MC, ka maikaʻi o nā ʻāpana a me ka mahana o ke kaiapuni hoʻohana.

Aia nā waiwai o nā ethers cellulose i ke ʻano, ka helu a me ka hoʻolaha ʻana o nā substituents. Hoʻokumu ʻia ka hoʻokaʻawale ʻana o nā ethers cellulose ma ke ʻano o nā substituents, ke kekelē o ka etherification, ka solubility a me nā waiwai noi pili. Wahi a ke ʻano o nā substituents ma ke kaulahao molekala, hiki ke hoʻokaʻawale ʻia i monoether a me ka ether hui ʻia. ʻO ka MC a mākou e hoʻohana pinepine ai he monoether, a ʻo ka HPMC he ether hui ʻia. ʻO ka Methyl cellulose ether MC ka huahana ma hope o ka pani ʻia ʻana o ka hui hydroxyl ma ka ʻāpana glucose o ka cellulose kūlohelohe e ka methoxy. ʻO ke ʻano hana ʻo [COH7O2(OH)3-h(OCH3)h]x. Ua pani ʻia kahi ʻāpana o ka hui hydroxyl ma ke anakahi e ka hui methoxy, a ua pani ʻia kekahi ʻāpana e ka hui hydroxypropyl, ʻo ke ʻano hana ʻo [C6H7O2(OH)3-mn(OCH3)m[OCH2CH(OH)CH3] n]x Ethyl methyl cellulose ether HEMC, ʻo ia nā ʻano nui i hoʻohana nui ʻia a kūʻai ʻia aku ma ka mākeke.

Ma ke ʻano o ka solubility, hiki ke hoʻokaʻawale ʻia i ionic a me non-ionic. ʻO nā ether cellulose non-ionic wai-soluble ʻia i haku ʻia me ʻelua mau moʻo o alkyl ethers a me hydroxyalkyl ethers. Hoʻohana nui ʻia ka Ionic CMC i nā detergents synthetic, ka paʻi ʻana a me ka hoʻoluʻu ʻana i ka lole, ka ʻimi ʻana i ka meaʻai a me ka aila. Hoʻohana nui ʻia ka Non-ionic MC, HPMC, HEMC, a pēlā aku i nā mea kūkulu hale, nā uhi latex, nā lāʻau lapaʻau, nā kemika o kēlā me kēia lā, a pēlā aku. Hoʻohana ʻia ma ke ʻano he thickener, mea paʻa wai, mea hoʻopaʻa, mea hoʻolaha a me ka mea hana kiʻiʻoniʻoni.

Ka paʻa ʻana o ka wai o ka cellulose ether: I ka hana ʻana o nā mea kūkulu hale, ʻoi aku ka pauka maloʻo, he kuleana koʻikoʻi ko ka cellulose ether, ʻoi aku hoʻi i ka hana ʻana o ka mortar kūikawā (mortar i hoʻololi ʻia), he ʻāpana koʻikoʻi a koʻikoʻi hoʻi ia. ʻO ke kuleana koʻikoʻi o ka cellulose ether wai-hoʻoheheʻe ʻia i loko o ka mortar he ʻekolu mau ʻano nui:

1. Ka mana paʻa wai maikaʻi loa
2. Hopena ma ke kūlike o ka mortar a me ka thixotropy
3. Ka launa pū ʻana me ka sima.

ʻO ka hopena paʻa wai o ka cellulose ether e pili ana i ka omo ʻana o ka wai o ka papa kumu, ke ʻano o ka mortar, ka mānoanoa o ka papa mortar, ka koi wai o ka mortar, a me ka manawa hoʻonohonoho o ka mea hoʻonohonoho. ʻO ka paʻa wai o ka cellulose ether ponoʻī mai ka solubility a me ka dehydration o ka cellulose ether ponoʻī. E like me kā mākou e ʻike nei, ʻoiai aia ka nui o nā hui OH hydratable kiʻekiʻe i loko o ke kaulahao molekala cellulose, ʻaʻole ia e hoʻoheheʻe ʻia i ka wai, no ka mea, he kiʻekiʻe ke kiʻekiʻe o ka crystallinity o ke ʻano cellulose. ʻAʻole lawa ka hiki ke hydration o nā hui hydroxyl wale nō e uhi i nā pilina hydrogen ikaika a me nā ikaika van der Waals ma waena o nā molekala. No laila, pehu wale ia akā ʻaʻole e hoʻoheheʻe ʻia i ka wai. Ke hoʻokomo ʻia kahi substituent i loko o ke kaulahao molekala, ʻaʻole wale ka substituent e luku i ke kaulahao hydrogen, akā ua luku ʻia ka pilina hydrogen interchain ma muli o ka wedging o ka substituent ma waena o nā kaulahao pili. ʻO ka nui o ka substituent, ʻoi aku ka nui o ka mamao ma waena o nā molekala. ʻO ka nui o ka mamao. ʻO ka nui o ka hopena o ka luku ʻana i nā pilina hydrogen, lilo ka cellulose ether i mea hoʻoheheʻe wai ma hope o ka hoʻonui ʻana o ka cellulose lattice a komo ka hopena, e hana ana i kahi hopena viscosity kiʻekiʻe. Ke piʻi ka mahana, nāwaliwali ka hydration o ka polymer, a ua kipaku ʻia ka wai ma waena o nā kaulahao. Ke lawa ka hopena dehydration, hoʻomaka nā mole e hōʻuluʻulu, e hana ana i kahi gel ʻōnaehana pūnaewele ʻekolu-dimensional a pelu ʻia.