Kusintha kwa cellulose ya Hydroxyethyl

Hydroxyethyl cellulose(HEC) ndi polima yosungunuka m'madzi yomwe imagwiritsidwa ntchito kwambiri m'mafakitale osiyanasiyana monga mankhwala, zodzoladzola, ndi zakudya. HEC imachokera ku cellulose, polima yachilengedwe yomwe imapezeka muzomera, ndipo imasinthidwa ndi magulu a hydroxyethyl kuti ipititse patsogolo kusungunuka kwamadzi ndi zinthu zina.

Kuwongolera kwa HEC kumaphatikizapo njira zingapo zoyeretsera ndikusintha polima kuti akwaniritse zofunikira zomwe akufuna kugwiritsa ntchito. Izi ndi zina mwazinthu zomwe zimakhudzidwa pakuwongolera HEC:

1. Kuyeretsedwa: Gawo loyamba pakukonzanso kwa HEC ndikuyeretsedwa kwa cellulose yaiwisi. Izi zimaphatikizapo kuchotsa zonyansa monga lignin, hemicellulose, ndi zowonongeka zina zomwe zingakhudze ubwino ndi katundu wa mankhwala omaliza. Kuyeretsedwa kungapezeke kudzera m'njira zosiyanasiyana monga kuchapa, kupukuta, ndi chithandizo cha enzymatic.

2. Alkalization: Pambuyo pa kuyeretsedwa, cellulose imathandizidwa ndi njira ya alkaline kuti iwonjezere kuyambiranso kwake ndikuthandizira kuyambitsa magulu a hydroxyethyl. Alkalization nthawi zambiri imachitika ndi sodium hydroxide kapena potaziyamu hydroxide pa kutentha ndi kupanikizika.

3. Etherification: Gawo lotsatira ndikuyambitsa magulu a hydroxyethyl pa msana wa cellulose. Izi zimachitika kudzera mu etherification, yomwe imaphatikizapo kuchitapo kanthu pa cellulose ndi ethylene oxide pamaso pa chothandizira zamchere. Mlingo wa etherification ukhoza kuwongoleredwa kuti ukwaniritse zomwe mukufuna monga viscosity, solubility, ndi kukhazikika kwamafuta.

4. Neutralization: Pambuyo pa etherification, mankhwalawa amachotsedwa kuti achotse alkali yotsalira ndikusintha pH kuti ikhale yoyenera kuti igwiritsidwe ntchito. Kusalowerera ndale kumatha kuchitika ndi asidi monga acetic acid kapena citric acid.

5. Kusefedwa ndi kuyanika: Chomaliza ndi kusefa ndi kuyanika kwa mankhwala oyengeka a HEC. Mankhwalawa nthawi zambiri amasefedwa kuti achotse zonyansa zonse zomwe zatsala ndikuwumitsidwa ku chinyezi choyenera kuti chisungidwe ndi kunyamula.

Ponseponse, kukonzanso kwa HEC kumaphatikizapo njira zingapo zoyeretsera ndikusintha ma cellulose yaiwisi kuti apange polima wapamwamba kwambiri, wosungunuka m'madzi wokhala ndi zinthu zenizeni zomwe zimagwiritsidwa ntchito.