Hydroxyethylcellulose (HEC) ndi polima osasungunuka m'madzi omwe amagwiritsidwa ntchito kwambiri popangira zokutira, zodzola, zomangira, zamankhwala ndi mafakitale ena. Ntchito yake yayikulu ndi monga thickener, suspending agent, film-forming agent ndi stabilizer, zomwe zingathe kusintha kwambiri rheological properties za mankhwala. HEC ili ndi kusungunuka kwabwino, kukhuthala, kupanga mafilimu komanso kuyanjana, kotero imayamikiridwa m'magawo ambiri. Komabe, ponena za kukhazikika kwa HEC ndi ntchito zake m'madera osiyanasiyana a pH, ndizofunikira kwambiri zomwe ziyenera kuganiziridwa muzogwiritsira ntchito.
Pankhani ya pH tilinazo, hydroxyethylcellulose, monga si ionic polima, mwachibadwa sakhudzidwa ndi kusintha kwa pH. Izi ndizosiyana ndi zina za ionic thickeners (monga carboxymethylcellulose kapena ma polima ena a acrylic), omwe ali ndi magulu a ionic m'magulu awo a maselo ndipo amatha kupatukana kapena ionization m'madera acidic kapena alkaline. , motero zimakhudza kukhuthala kwake komanso mphamvu ya rheological ya yankho. Chifukwa HEC ilibe ndalama, zotsatira zake zokometsera ndi zosungunuka zimakhalabe zokhazikika pa pH (nthawi zambiri pH 3 mpaka pH 11). Mbaliyi imathandizira HEC kuti igwirizane ndi machitidwe osiyanasiyana opangira mapangidwe ndipo ikhoza kukhala ndi zotsatira zabwino zokometsera pansi pa acidic, ndale kapena zofooka za alkaline.
Ngakhale HEC ili ndi kukhazikika kwabwino pansi pa pH zambiri za pH, ntchito yake ingakhudzidwe pa malo owopsa a pH, monga malo a acidic kwambiri kapena amchere. Mwachitsanzo, pansi pa zinthu za acidic kwambiri (pH <3), kusungunuka kwa HEC kumatha kuchepetsedwa ndipo kukhuthala sikungakhale kofunikira ngati malo osalowerera kapena ochepa. Izi ndichifukwa choti kuchuluka kwa hydrogen ion ion kungakhudze kusintha kwa ma molekyulu a HEC, kuchepetsa kuthekera kwake kufalikira ndi kutupa m'madzi. Momwemonso, pansi pamikhalidwe yamchere kwambiri (pH> 11), HEC imatha kuwonongeka pang'ono kapena kusinthidwa kwamankhwala, zomwe zimakhudza kukulitsa kwake.
Kuphatikiza pa kusungunuka ndi kukulitsa zotsatira, pH ingakhudzenso kuyanjana kwa HEC ndi zigawo zina zopangira. Pansi pa madera osiyanasiyana a pH, zinthu zina zogwira ntchito zimatha ionize kapena kusokoneza, potero kusintha kuyanjana kwawo ndi HEC. Mwachitsanzo, pansi pa acidic, ma ion zitsulo kapena cationic yogwira ntchito amatha kupanga zovuta ndi HEC, zomwe zimapangitsa kuti kukhuthala kwake kufooke kapena kutsika. Choncho, pakupanga mapangidwe, kuyanjana pakati pa HEC ndi zinthu zina zomwe zili pansi pa pH zosiyana ziyenera kuganiziridwa kuti zitsimikizire kukhazikika ndi kugwira ntchito kwa dongosolo lonse.
Ngakhale HEC yokhayokhayo imakhala yosakhudzidwa kwambiri ndi kusintha kwa pH, mlingo wake wa kusungunuka ndi kusungunuka kungakhudzidwe ndi pH. HEC nthawi zambiri imasungunuka mofulumira pansi pa zinthu zopanda ndale kapena pang'ono acidic, pamene pansi pa acidic kwambiri kapena alkaline mikhalidwe yosungunuka ikhoza kukhala yocheperapo. Choncho, pokonzekera mayankho, nthawi zambiri amalangizidwa kuti ayambe kuwonjezera HEC ku njira yosalowerera ndale kapena pafupi-yosalowerera ndale kuti atsimikizire kuti imasungunuka mofulumira komanso mofanana.
Hydroxyethylcellulose (HEC), ngati polima yosakhala ya ionic, imakhala yosakhudzidwa kwambiri ndi pH ndipo imatha kukhalabe ndi zotsatira zolimba komanso zosungunuka pa pH yotakata. Kuchita kwake kumakhala kokhazikika pa pH 3 mpaka pH 11, koma m'malo a asidi ndi alkali kwambiri, kukhuthala kwake ndi kusungunuka kwake kungakhudzidwe. Choncho, pogwiritsira ntchito HEC, ngakhale kuti nthawi zambiri palibe chifukwa choganizira kwambiri kusintha kwa pH, pansi pa zovuta kwambiri, kuyezetsa koyenera ndi kusintha kumafunikabe kuti zitsimikizire kukhazikika ndi kugwira ntchito kwa dongosolo.
Nthawi yotumiza: Oct-22-2024