ʻO ka Cellulose ether kahi hui polymer i synthesized mai ka cellulose kūlohelohe ma o ke kaʻina hana etherification, a he mea hoʻomānoanoa maikaʻi loa a me ka mālama ʻana i ka wai.
Ka Moolelo Noiʻi
Ua hoʻohana nui ʻia nā ethers cellulose i loko o ka mortar maloʻo-hui ʻia i nā makahiki i hala iho nei, ʻo ka mea i hoʻohana nui ʻia kekahi mau ethers cellulose non-ionic, me ka methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC) a me hydroxypropyl methyl cellulose ether (HPMC). I kēia manawa, ʻaʻohe nui o nā palapala e pili ana i ke ʻano ana o ka viscosity o ka cellulose ether solution. I ko mākou ʻāina, ʻo kekahi mau kūlana a me nā monographs wale nō e kuhikuhi ana i ke ʻano hoʻāʻo o ka viscosity o ka cellulose ether solution.
ʻO ke ʻano hoʻomākaukau o ka hopena cellulose ether
Ka Hoʻomākaukau ʻana o ka Methyl Cellulose Ether Solution
ʻO nā methyl cellulose ethers e pili ana i nā cellulose ethers e loaʻa ana 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 nā hopena cellulose ether e loaʻa ana nā hui methyl he mau waiwai gelation thermal, ʻo ia hoʻi, ʻaʻole hiki ke hoʻoheheʻe ʻia i ka wai wela ma kahi mahana kiʻekiʻe ma mua o ko lākou mahana gelation (ma kahi o 60-80°C). I mea e pale ai i ka hopena 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 hoʻoulu e hoʻopuehu, e hoʻomau i ka hoʻoulu ʻana a hoʻomaʻalili i ka mahana i hoʻonohonoho ʻia, hiki ke hoʻomākaukau ʻia i loko o kahi hopena cellulose ether like.
Nā waiwai hoʻoheheʻe ʻia o nā ethers i loaʻa ka methylcellulose i mālama ʻole ʻia ma ka ʻili
I mea e pale aku ai i ka hoʻākoakoa ʻana o ka cellulose ether i ka wā o ke kaʻina hana hoʻoheheʻe ʻana, hana pinepine nā mea hana i ka mālama ʻili kemika ma luna o nā huahana cellulose ether pauka e hoʻopaneʻe i ka hoʻoheheʻe ʻana. Hana ʻia kāna kaʻina hana hoʻoheheʻe ma hope o ka hoʻopuehu piha ʻana o ka cellulose ether, no laila hiki ke hoʻopuehu pololei ʻia i loko o ka wai anuanu me kahi waiwai pH kūlike me ka ʻole o ka hoʻokumu ʻana i nā agglomerates. ʻO ke kiʻekiʻe o ka waiwai pH o ka hopena, ʻo ka pōkole o ka manawa hoʻoheheʻe o ka cellulose ether me nā waiwai hoʻoheheʻe lohi. E hoʻoponopono i ka waiwai pH o ka hopena i kahi waiwai kiʻekiʻe aʻe. E hoʻopau ka Alkalinity i ka solubility lohi o ka cellulose ether, e hana ana i ka cellulose ether e hana i nā agglomerates i ka wā e hoʻoheheʻe ai. No laila, pono e hoʻokiʻekiʻe ʻia a hoʻohaʻahaʻa ʻia paha ka waiwai pH o ka hopena ma hope o ka hoʻopuehu piha ʻana o ka cellulose ether.
Nā waiwai hoʻoheheʻe ʻia o nā ethers i loaʻa i ka methylcellulose i mālama ʻia ma ka ʻili
Ka Hoʻomākaukau ʻana o ka Hydroxyethyl Cellulose Ether Solution
ʻAʻohe waiwai o ka hopena Hydroxyethyl cellulose ether (HEC) o ka gelation thermal, no laila, ʻo HEC me ka ʻole o ka mālama ʻana i ka ʻili e hana pū i nā agglomerates i ka wai wela. Hana pinepine 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 ka wai anuanu me ka waiwai pH kūlike me ka ʻole o ka hana ʻana i nā agglomerates. Pēlā nō, i loko o kahi hopena me ka alkalinity kiʻekiʻe, HEC Hiki iā ia ke hana i nā agglomerates ma muli o ka lohi o ka nalowale o ka solubility. ʻOiai he alkaline ka slurry cement ma hope o ka hydration a ʻo ka waiwai pH o ka hopena ma waena o 12 a me 13, ʻo ka wikiwiki o ka hoʻoheheʻe ʻana o ka cellulose ether i mālama ʻia i ka ʻili i loko o ka slurry cement he wikiwiki loa.
Nā waiwai hoʻoheheʻe ʻia o ka HEC i mālama ʻia ma ka ʻili
Hopena a me ka Nānā ʻana
1. Kaʻina hana hoʻopuehu
I mea e pale aku ai i nā hopena maikaʻi ʻole i ka manawa hoʻāʻo ma muli o ka lohi o ka hoʻoheheʻe ʻana o nā mea lapaʻau ʻili, ua ʻōlelo ʻia e hoʻohana i ka wai wela no ka hoʻomākaukau ʻana.
2. Kaʻina hana hoʻoluʻu
Pono e hoʻoulu ʻia a hoʻomaʻalili ʻia nā hopena cellulose ether i ka mahana ambient e hōʻemi i ka wikiwiki o ka hoʻomaʻalili ʻana, kahi e pono ai nā manawa hoʻāʻo lōʻihi.
3. Kaʻina hana 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 o ka gel, e hoʻomaka ka cellulose ether e hoʻoheheʻe, a e lilo mālie ka wai i viscous. I kēia manawa, pono e hoʻemi ʻia ka wikiwiki o ka hoʻoulu ʻana. Ma hope o ka hiki ʻana o ka wai i kahi viscosity, pono e kū mālie no nā hola he 10 a ʻoi ma mua o ka lana mālie ʻana o nā pehu i luna e pohā a nalo.
Nā ʻŌhū Ea i loko o ka Hoʻonā Cellulose Ether
4. Kaʻina hana hoʻomaʻū
Pono e ana pololei ʻia ka maikaʻi o ka cellulose ether a me ka wai, a mai kali i ka hopena e hiki i kahi mānoanoa kiʻekiʻe ma mua o ka hoʻopiha hou ʻana i ka wai.
5. Hoʻāʻo mānoanoa
Ma muli o ka thixotropy o ka hopena cellulose ether, i ka wā e hoʻāʻo ai i kona viscosity, i ka wā e hoʻokomo ʻia ai ka rotor o ka viscometer rotational i loko o ka hopena, e hoʻopilikia ia i ka hopena a hoʻopilikia i nā hopena ana. No laila, ma hope o ka hoʻokomo ʻia ʻana o ka rotor i loko o ka hopena, pono e ʻae ʻia e kū no 5 min ma mua o ka hoʻāʻo ʻana.
Ka manawa hoʻouna: Malaki-22-2023