Hydroxyethyl cellulose (HEC) ndi zinthu zomwe sizimasungunuka m'madzi za polima zomwe zimagwiritsidwa ntchito kwambiri muzodzola, mankhwala, utoto, zokutira, zomanga ndi zina. Ili ndi makulidwe abwino kwambiri, kuyimitsidwa, kubalalitsidwa, emulsification, kupanga filimu, kusunga madzi ndi zinthu zina, kotero yakhala yofunika kwambiri yothandizira m'mafakitale ambiri. Komabe, cellulose ya hydroxyethyl sichipezeka mwachindunji kuchokera kuzinthu zachilengedwe, koma imapezeka mwa kusintha mankhwala a cellulose. Kuti izi zitheke, kuti timvetsetse gwero lachilengedwe la cellulose ya hydroxyethyl, choyamba tiyenera kumvetsetsa gwero ndi kapangidwe ka cellulose.
Gwero lachilengedwe la cellulose
Ma cellulose ndi amodzi mwa ma polima ochuluka kwambiri padziko lapansi ndipo amapezeka kwambiri m'makoma a zomera, makamaka mumitengo yamitengo, thonje, fulakisi ndi ulusi wina wamitengo. Ndilo gawo lofunikira mu kapangidwe ka zomera ndipo limapereka mphamvu zamakina ndi kukhazikika. Chigawo choyambirira cha cellulose ndi molekyulu ya shuga, yomwe imalumikizidwa ndi β-1,4-glycosidic bond kuti ipange unyolo wautali. Monga zinthu zachilengedwe za polima, cellulose imakhala ndi zinthu zabwino kwambiri zakuthupi komanso zamankhwala, zomwe zimapangitsa kuti ikhale yofunika kwambiri pazotengera zosiyanasiyana.
Kukonzekera kwa hydroxyethyl cellulose
Ngakhale ma cellulose pawokha ali ndi zinthu zambiri zabwino, kugwiritsa ntchito kwake kumakhala kochepa kwambiri. Chifukwa chachikulu ndi chakuti mapadi sasungunuka bwino, makamaka kusungunuka kochepa m'madzi. Pofuna kukonza izi, asayansi amasintha cellulose kuti akonze zotuluka zosiyanasiyana za cellulose. Hydroxyethyl cellulose ndi ether yosungunuka m'madzi ya cellulose yomwe imapezeka mwa ethoxylating cellulose yachilengedwe kudzera pamachitidwe amankhwala.
Mu ndondomeko yeniyeni yokonzekera, mapadi achilengedwe amayamba kusungunuka mu njira ya alkali, ndiyeno ethylene oxide imawonjezedwa ku machitidwe. Ethoxylation reaction ya ethylene oxide ndi magulu a hydroxyl mu cellulose zimachitika kuti apange hydroxyethyl cellulose. Kusintha uku kumawonjezera hydrophilicity ya maunyolo a cellulose, potero kuwongolera kusungunuka kwake ndi kukhuthala kwake m'madzi.
Main zopangira magwero
Zopangira zachilengedwe zopangira hydroxyethyl cellulose ndi cellulose, ndipo magwero achilengedwe a cellulose akuphatikizapo:
Wood: Ma cellulose mu nkhuni ndi okwera, makamaka mumitengo ya coniferous ndi yotakata, pomwe mapadi amatha kufika 40% -50%. Wood ndi imodzi mwazinthu zofunika kwambiri za cellulose m'makampani, makamaka popanga mapepala komanso kupanga zotumphukira za cellulose.
Thonje: Ulusi wa thonje umakhala pafupifupi wopangidwa ndi cellulose weniweni, ndipo cellulose yomwe ili mu thonje imakhala yokwera kwambiri kuposa 90%. Chifukwa cha kuyera kwake, ulusi wa thonje nthawi zambiri umagwiritsidwa ntchito pokonzekera zotumphukira zapamwamba za cellulose.
Ulusi wa zomera monga fulakisi ndi hemp: Ulusi wa zomerazi ulinso ndi cellulose wambiri, ndipo chifukwa chakuti ulusi wa zomerazi umakhala ndi mphamvu zambiri zamakina, umakhalanso ndi ubwino wina pakuchotsa mapadi.
Zinyalala zaulimi: kuphatikizapo udzu, udzu wa tirigu, udzu wa chimanga, ndi zina zotero. Zidazi zimakhala ndi cellulose yambiri, ndipo mapadi amatha kuchotsedwa mwa iwo kudzera mu njira zoyenera zochizira, kupereka gwero lotsika mtengo komanso longowonjezwdwanso la zopangira kupanga zotumphukira za cellulose. .
Malo ogwiritsira ntchito hydroxyethyl cellulose
Chifukwa chapadera cha hydroxyethyl cellulose, chimagwiritsidwa ntchito m'magawo ambiri. Nawa madera ambiri ogwiritsira ntchito:
Makampani omanga: Hydroxyethyl cellulose imagwiritsidwa ntchito kwambiri muzomangamanga ngati chowonjezera komanso chosungira madzi, makamaka mumatope a simenti, gypsum, putty powder ndi zida zina, zomwe zimatha kukonza bwino ntchito yomanga ndi kusunga madzi.
Makampani opanga mankhwala atsiku ndi tsiku: Mu zotsukira, zosamalira khungu, ma shampoos ndi mankhwala ena atsiku ndi tsiku, hydroxyethyl cellulose imagwiritsidwa ntchito ngati thickener ndi stabilizer kuti mankhwalawo amve komanso kukhazikika kwake.
Utoto ndi zokutira: M'makampani opanga zokutira, hydroxyethyl cellulose imagwiritsidwa ntchito ngati chowonjezera komanso chowongolera ma rheology kuti chiwongolerocho chigwire bwino ntchito ndikupewa kugwa.
Pharmaceutical munda: Pokonzekera mankhwala, hydroxyethyl mapadi angagwiritsidwe ntchito ngati binder, thickener ndi suspending wothandizira pamapiritsi kusintha kumasulidwa makhalidwe ndi bata la mankhwala.
Ngakhale hydroxyethyl cellulose sizinthu zongochitika mwachilengedwe, zopangira zake, cellulose, zimapezeka kwambiri muzomera m'chilengedwe. Kupyolera mu kusintha kwa mankhwala, mapadi achilengedwe amatha kusinthidwa kukhala hydroxyethyl cellulose ndikuchita bwino kwambiri ndikugwiritsidwa ntchito m'mafakitale osiyanasiyana. Zomera zachilengedwe monga nkhuni, thonje, fulakesi, ndi zina zotero zimapereka gwero lolemera la zipangizo zopangira hydroxyethyl cellulose. Ndi kupita patsogolo kwa sayansi ndi ukadaulo komanso kuchuluka kwa kufunikira kwa mafakitale, njira yopangira hydroxyethyl cellulose ikukonzedwanso mosalekeza, ndipo ikuyembekezeka kuwonetsa phindu lake lapadera m'magawo ambiri mtsogolo.
Nthawi yotumiza: Oct-23-2024