ʻO ka Hydroxyethyl cellulose (HEC) he non-ionic cellulose ether i hoʻohana nui ʻia i ke kūkulu ʻana, ka uhi ʻana, ka aila, nā kemika i kēlā me kēia lā a me nā māla ʻē aʻe. He mānoanoa maikaʻi, hoʻokuʻu, hoʻopuehu, emulsification, hana kiʻiʻoniʻoni, colloid pale a me nā waiwai ʻē aʻe, a he mea nui ka mānoanoa a me ka stabilizer.
1. Hoʻomākaukau i nā mea maka
ʻO ka mea nui o ka hydroxyethyl cellulose he cellulose maoli. Lawe ʻia ka cellulose mai ka lāʻau, pulupulu a i ʻole nā mea kanu ʻē aʻe. He mea maʻalahi ke kaʻina hana o ka cellulose, akā pono ka maʻemaʻe kiʻekiʻe e hōʻoia i ka hana o ka huahana hope. No kēia kumu, hoʻohana mau ʻia nā ʻano kemika a i ʻole nā mekanika no ka mālama mua ʻana i ka cellulose, me ka defatting, de-impurity, bleaching a me nā hana ʻē aʻe e wehe i nā mea haumia a me nā ʻāpana cellulose ʻole.
2. Lapaʻau Alkalization
ʻO ka mālama ʻana i ka alkalization kahi hana koʻikoʻi i ke kaʻina hana o ka hydroxyethyl cellulose. ʻO ke kumu o kēia ʻanuʻu, ʻo ia ka hoʻāla ʻana i ka pūʻulu hydroxyl (-OH) ma ke kaulahao molekula cellulose e hoʻomaʻamaʻa i ka hopena etherification ma hope. Hoʻohana mau ʻia ka hopena sodium hydroxide (NaOH) ma ke ʻano he ʻano alkalizing agent. ʻO ke kaʻina hana kikoʻī: hoʻohui i ka cellulose me ka solution sodium hydroxide e pehu piha a hoʻopuehu i ka cellulose ma lalo o nā kūlana alkaline. I kēia manawa, ʻoi aku ka ikaika o nā pūʻulu hydroxyl ma nā molekule cellulose, e hoʻomākaukau ana no ka hopena etherification ma hope.
3. Etherification pane
ʻO ka hopena Etherification ke kumu nui o ka hana ʻana o ka hydroxyethyl cellulose. ʻO kēia kaʻina hana no ka hoʻokomo ʻana i ka ethylene oxide (ʻike ʻia ʻo ethylene oxide) i ka cellulose ma hope o ka mālama ʻana i ka alkalinization, a e hana pū me nā pūʻulu hydroxyl i loko o nā molekole cellulose e hana i ka hydroxyethyl cellulose. Hana ʻia ka pane ʻana i loko o kahi reactor i pani ʻia, mālama ʻia ka wela o ka hopena ma 50-100°C, a ʻo ka manawa pane mai kekahi mau hola a ʻoi aku ma mua o ʻumi hola. ʻO ka huahana hope loa o ka hopena he ʻāpana cellulose ether hydroxyethylated.
4. Neutralization a holoi
Ma hope o ka pau ʻana o ka hopena etherification, loaʻa i nā reactants ka nui o ka alkali a me nā huahana ʻole. I mea e loaʻa ai kahi huahana hydroxyethyl cellulose maʻemaʻe, pono e hoʻokō ʻia ka neutralization a me ka holoi ʻana. ʻO ka maʻamau, hoʻohana ʻia ka dilute acid (e like me ka dilute hydrochloric acid) e hoʻokaʻawale i ke koena alkali i loko o ka hopena, a laila holoi pinepine ʻia nā reactants me ka nui o ka wai e hoʻoneʻe i nā mea haumia a me nā huahana. Aia ka hydroxyethyl cellulose i holoi ʻia ma ke ʻano o kahi keke kānana pulu.
5. Dehydration a maloʻo
ʻO ka keke pulu ma hope o ka holoi ʻana he nui ka wai a pono e hoʻomaloʻo a maloʻo no ka loaʻa ʻana o kahi huahana hydroxyethyl cellulose pauka. Hoʻohana pinepine ʻia ka hoʻomaʻemaʻe wai e ka kānana māmā a i ʻole ka hoʻokaʻawale centrifugal e wehe i ka hapa nui o ka wai. Ma hope iho, hoʻouna ʻia ka keke pulu i nā mea hoʻomaloʻo no ka maloʻo. ʻO nā mea hoʻomaloʻo maʻamau e pili ana i nā mea hoʻomaloʻo pahu, nā mea maloʻo uila a me nā mea maloʻo ehu. Mālama ʻia ka mahana maloʻo ma 60-120 ℃ no ka pale ʻana i ka wela nui mai ka hana ʻana i ka denaturation huahana a i ʻole ka hōʻino ʻana i ka hana.
6. Ka wili ʻana a me ka nānā ʻana
ʻO ka hydroxyethyl cellulose ka mea maʻamau he poloka nui a i ʻole nā mea granular. I mea e maʻalahi ai ka hoʻohana ʻana a me ka hoʻomaikaʻi ʻana i ka hoʻopuehu ʻana o ka huahana, pono ia e lepo a pale ʻia. Hoʻohana maʻamau ka wili ʻana i kahi mīkini mīkini e wili ai i nā poloka nui o nā mea i loko o ka pauda maikaʻi. ʻO ka nānā ʻana ke hoʻokaʻawale i nā ʻāpana koʻikoʻi ʻaʻole i hiki i ka nui o ka ʻāpana i makemake ʻia i ka pauka maikaʻi ma o nā pale me nā puka ʻokoʻa e hōʻoia i ka maikaʻi like ʻole o ka huahana hope.
7. Hoʻopili ʻia a me ka mālama ʻana i nā huahana
ʻO ka huahana hydroxyethyl cellulose ma hope o ka wili ʻana a me ka nānā ʻana i kahi wai a me ka dispersibility, kūpono ia no ka noi pololei a i ʻole ka hana hou ʻana. Pono e hoʻopaʻa ʻia ka huahana hope a mālama ʻia i mea e pale ai i ka makū, ka ʻino a i ʻole ka oxidation i ka wā o ka lawe ʻana a me ka mālama ʻana. Hoʻohana mau ʻia nā mea hoʻopaʻa moisture-proof a me anti-oxidation e like me nā ʻeke alumini alumini a i ʻole nā ʻeke ʻeke multi-layer no ka hoʻopili ʻana. Ma hope o ka hoʻopili ʻana, pono e mālama ʻia ka huahana i loko o kahi ʻoluʻolu a maloʻo, e pale aku i ka lā pololei a me ke kiʻekiʻe o ka mahana a me nā kūlana haʻahaʻa kiʻekiʻe e hōʻoia i kāna hana paʻa.
ʻO ke kaʻina hana o ka hydroxyethyl cellulose ka nui o ka hoʻomākaukau ʻana i nā mea maka, ka mālama alkalization, ka hopena etherification, neutralization a me ka holoi ʻana, dehydration a me ka hoʻomaloʻo ʻana, ka wili ʻana a me ka nānā ʻana, a me ka hoʻopili ʻana a me ka mālama ʻana i nā huahana hope loa. Loaʻa i kēlā me kēia ʻanuʻu kona mau koi kaʻina hana kūikawā a me nā wahi mana. Pono e ho'omalu pono'ia nā kūlana hopena a me nā kiko'ī hana i ka wā o ka hana hana e hō'oia i ka maika'i a me ka hana pa'a o ka huahana. He nui nā noi o kēia mea polymer multifunctional i ka hana ʻoihana a me ke ola o kēlā me kēia lā, e hōʻike ana i kona koʻikoʻi hiki ʻole ke hoʻololi.
Ka manawa hoʻouna: ʻAukake-21-2024