Focus on Cellulose ethers

Kūkākūkā e pili ana i ka Viscosity Test Method of Cellulose Ether Solution for Dry-Mix Mortar

ʻO ka cellulose ether kahi pūhui polymer i hoʻohui ʻia mai ka cellulose kūlohelohe ma o ke kaʻina hana etherification, a he mea hoʻopaʻa paʻa wai maikaʻi loa.

Ka Huli Huli
Ua hoʻohana nui ʻia nā cellulose ethers i loko o ka mortar maloʻo-mixed i nā makahiki i hala iho nei, ʻo ka mea i hoʻohana nui ʻia kekahi mau non-ionic cellulose ethers, me ka methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC). ) a me ka hydroxypropyl methyl cellulose ether (HPMC). I kēia manawa, ʻaʻole nui nā palapala e pili ana i ke ʻano ana o ka viscosity o ka solution cellulose ether. I ko mākou ʻāina, ʻo kekahi mau maʻamau a me nā monographs e kuhikuhi i ke ʻano hoʻāʻo o ka viscosity o ka cellulose ether solution.

Ka hoʻomākaukau ʻana o ka Methyl Cellulose Ether Solution
Methyl cellulose ethers e pili ana i ka cellulose ethers i loaʻa nā hui methyl i loko o ka mole, e like me MC, HEMC a me HPMC. Ma muli o ka hydrophobicity o ka hui methyl, ʻo ka cellulose ether solutions i loaʻa nā hui methyl i loaʻa nā waiwai gelation thermal, ʻo ia hoʻi, ʻaʻole hiki ke hoʻoheheʻe ʻia i loko o ka wai wela ma kahi mahana i ʻoi aku ka kiʻekiʻe ma mua o ko lākou gelation (e pili ana i 60-80 ° C). I mea e pale ai i ka hopena o ka cellulose ether mai ka hoʻokumu ʻana i nā agglomerates, e hoʻomehana i ka wai ma luna o kona mahana gel, ma kahi o 80 ~ 90 ° C, a laila e hoʻohui i ka pauka cellulose ether i loko o ka wai wela, e hoʻoneʻe e hoʻopuehu, e hoʻomau i ka hoʻoulu ʻana a me ka hoʻoluʻu i lalo. ka mahana, hiki ke hoʻomākaukau ʻia i loko o kahi hopena cellulose ether.

I mea e pale aku ai i ka agglomeration o ka cellulose ether i ka wā o ka hoʻoheheʻe ʻana, hana nā mea hana i kekahi manawa i ka hoʻomaʻamaʻa ʻana i ke kemika ma luna o nā huahana cellulose ether pauka e hoʻopaneʻe i ka hoʻohemo ʻana. Hana ʻia kāna kaʻina hoʻoheheʻe ma hope o ka hoʻopuehu ʻia ʻana o ka cellulose ether, no laila hiki ke hoʻopuehu pololei ʻia i loko o ka wai anuanu me kahi waiwai pH kūʻokoʻa me ka ʻole o ka hoʻokumu ʻana i nā agglomerates. ʻOi aku ka kiʻekiʻe o ka pH waiwai o ka hopena, ʻoi aku ka pōkole o ka manawa hoʻoheheʻe o ka cellulose ether me nā waiwai hoʻoheheʻe lohi. E hoʻololi i ka waiwai pH o ka hoʻonā i kahi waiwai kiʻekiʻe. E hoʻopau ka alkaline i ka hiki ke hoʻopaneʻe ʻia o ka cellulose ether, e hana ai ka cellulose ether e hana i nā agglomerates i ka wā e hemo ai. No laila, pono e hoʻokiʻekiʻe a hoʻohaʻahaʻa ʻia ka pH waiwai o ka hopena ma hope o ka hoʻopuehu ʻia ʻana o ka cellulose ether.

Hoʻomākaukau i ka Hydroxyethyl Cellulose Ether Solution
Hydroxyethyl cellulose ether (HEC) ʻaʻohe waiwai o ka wai wela, no laila, ʻo HEC me ka ʻole o ka mālama ʻana i ka ʻili e hana pū i nā agglomerates i ka wai wela. Hoʻomaʻamaʻa maʻamau nā mea hana i ka mālama ʻana i ka ʻili kemika ma ka pauka HEC e hoʻopaneʻe i ka hoʻoheheʻe ʻana, i hiki ke hoʻopuehu pololei ʻia i loko o ka wai anuanu me kahi waiwai pH kū ʻole me ka hoʻokumu ʻana i nā agglomerates. Pēlā nō, i loko o kahi hoʻonā me kahi alkalinity kiʻekiʻe, HEC Hiki iā ia ke hana i nā agglomerates ma muli o ka nalowale o ka solubility lohi. No ka mea he alkaline ka slurry sima ma hope o ka hydration a ʻo ka pH waiwai o ka hopena ma waena o 12 a me 13, ʻo ka wikiwiki o ka hemo ʻana o ka cellulose ether i mālama ʻia i ka ʻili i loko o ka slurry sima he wikiwiki loa.

Ka Manaʻo a me ka ʻIkepili

1. Kaʻina hoʻopuehu
I mea e pale aku ai i nā hopena maikaʻi ʻole i ka manawa hoʻāʻo ma muli o ka hoʻoheheʻe lohi ʻana o nā mea lapaʻau ma luna, ua ʻōlelo ʻia e hoʻohana i ka wai wela no ka hoʻomākaukau.

2. Ke kaʻina hana hoʻoluʻu
Pono e hoʻoulu ʻia a hoʻoluʻu ʻia nā hopena cellulose ether i ka mahana ambient e hōʻemi i ka nui o ka hoʻoilo, e koi ana i nā manawa hoʻāʻo lōʻihi.

3. Kaʻina hoʻoulu
Ma hope o ka hoʻohui ʻia ʻana o ka cellulose ether i ka wai wela, e hoʻomau i ka hoʻoulu ʻana. Ke hāʻule ka mahana o ka wai ma lalo o ka mahana gel, e hoʻomaka ka cellulose ether e hoʻoheheʻe, a e lilo ka hopena i mea viscous. I kēia manawa, pono e hoʻemi ʻia ka wikiwiki o ka hoʻoulu ʻana. Ma hope o ka hiki ʻana o ka hopena i kahi viscosity, pono ia e kū mālie ma mua o 10 mau hola ma mua o ka lele mālie ʻana o nā ʻōpū i ka ʻili e poha a nalowale.

4. Kaʻina hana hydrating
Pono e ana pono ʻia ka maikaʻi o ka cellulose ether a me ka wai, a e hoʻāʻo ʻaʻole e kali i ka hopena e hiki i kahi viscosity kiʻekiʻe ma mua o ka hoʻopiha ʻana i ka wai.

5. Ho'āʻo viscosity
Ma muli o ka thixotropy o ka cellulose ether solution, i ka wā e hoʻāʻo ai i kona viscosity, ke hoʻokomo ʻia ka rotor o ka viscometer rotational i loko o ka hopena, e hoʻopilikia ia i ka hopena a pili i nā hopena ana. No laila, ma hope o ka hoʻokomo ʻia ʻana o ka rotor i ka hopena, pono e ʻae ʻia e kū no 5 min ma mua o ka hoʻāʻo.


Ka manawa hoʻouna: Feb-08-2023
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