Hydroxyethyl cellulose (HEC) ndi polima yosasungunuka m'madzi yomwe imagwiritsidwa ntchito kwambiri mu zodzoladzola, mankhwala, utoto, zokutira, zomangamanga ndi zina. Ili ndi kukhuthala kwabwino, kuyimitsidwa, kufalikira, emulsification, kupanga filimu, kusunga madzi ndi zinthu zina, kotero yakhala chinthu chofunikira chothandizira m'mafakitale ambiri. Komabe, hydroxyethyl cellulose siipezeka mwachindunji kuchokera kuzinthu zachilengedwe, koma imapezeka posintha cellulose mwa mankhwala. Kuti tikwaniritse izi, kuti timvetse gwero lachilengedwe la hydroxyethyl cellulose, choyamba tiyenera kumvetsetsa gwero ndi kapangidwe ka cellulose.
Gwero lachilengedwe la cellulose
Cellulose ndi imodzi mwa ma polima achilengedwe ochulukirapo padziko lapansi ndipo imapezeka kwambiri m'makoma a maselo a zomera, makamaka m'zomera zamatabwa, thonje, fulakesi ndi ulusi wina wa zomera. Ndi gawo lofunika kwambiri pa kapangidwe ka zomera ndipo limapereka mphamvu ndi kukhazikika kwa makina. Gawo loyambira la cellulose ndi molekyulu ya shuga, yomwe imalumikizidwa ndi ma bond a β-1,4-glycosidic kuti ipange kapangidwe ka unyolo wautali. Monga chinthu chachilengedwe cha polima, cellulose ili ndi mphamvu zabwino kwambiri zakuthupi ndi zamakemikolo, zomwe zimapangitsa kuti ikhale chinthu chofunikira kwambiri pazinthu zosiyanasiyana.
Kukonzekera kwa hydroxyethyl cellulose
Ngakhale kuti cellulose yokha ili ndi makhalidwe abwino kwambiri, kuchuluka kwa momwe imagwiritsidwira ntchito kuli kochepa. Chifukwa chachikulu ndichakuti cellulose ili ndi kusungunuka kochepa, makamaka kusungunuka kochepa m'madzi. Pofuna kukonza khalidweli, asayansi amasintha cellulose mwa mankhwala kuti akonze zinthu zosiyanasiyana zochokera ku cellulose. Hydroxyethyl cellulose ndi ether ya cellulose yosungunuka m'madzi yomwe imapezeka potulutsa cellulose yachilengedwe kudzera mu chemical reaction.
Mu njira yokonzekera yeniyeni, cellulose yachilengedwe imasungunuka kaye mu yankho la alkali, kenako ethylene oxide imawonjezedwa ku dongosolo la reaction. Ethoxylation reaction ya ethylene oxide ndi magulu a hydroxyl mu cellulose imachitika kuti ipange hydroxyethyl cellulose. Kusintha kumeneku kumawonjezera hydrophilicity ya unyolo wa cellulose, motero kumawonjezera kusungunuka kwake ndi mphamvu zake zokhuthala m'madzi.
Magwero akuluakulu a zinthu zopangira
Zinthu zachilengedwe zofunika kwambiri popangira hydroxyethyl cellulose ndi cellulose, ndipo magwero achilengedwe a cellulose ndi awa:
Matabwa: Muli ma cellulose ambiri mu matabwa, makamaka mu mitengo ya coniferous ndi ya masamba akuluakulu, komwe cellulose imatha kufika 40%-50%. Matabwa ndi amodzi mwa magwero ofunikira kwambiri a cellulose m'mafakitale, makamaka popanga mapepala ndi kupanga zinthu zochokera ku cellulose.
Thonje: Ulusi wa thonje umapangidwa ndi cellulose yeniyeni, ndipo kuchuluka kwa cellulose mu thonje kuli kopitilira 90%. Chifukwa cha kuyera kwake kwakukulu, ulusi wa thonje nthawi zambiri umagwiritsidwa ntchito popanga zinthu zotumphukira za cellulose zapamwamba.
Ulusi wa zomera monga fulakesi ndi hemp: Ulusi wa zomera uwu ulinso ndi cellulose yambiri, ndipo chifukwa ulusi wa zomera uwu nthawi zambiri umakhala ndi mphamvu zambiri zamakaniko, umakhalanso ndi ubwino wina pochotsa cellulose.
Zinyalala zaulimi: kuphatikizapo udzu, udzu wa tirigu, udzu wa chimanga, ndi zina zotero. Zipangizozi zili ndi kuchuluka kwa cellulose, ndipo cellulose imatha kuchotsedwamo kudzera mu njira zoyenera zochizira, zomwe zimapangitsa kuti pakhale zinthu zopangira zinthu zotsika mtengo komanso zobwezerezedwanso zopangira cellulose.
Madera ogwiritsira ntchito hydroxyethyl cellulose
Chifukwa cha mphamvu zake zapadera za hydroxyethyl cellulose, imagwiritsidwa ntchito kwambiri m'magawo ambiri. Nazi madera angapo ofunikira omwe amagwiritsidwa ntchito:
Makampani Omanga: Hydroxyethyl cellulose imagwiritsidwa ntchito kwambiri pa zipangizo zomangira ngati chokhuthala komanso chosungira madzi, makamaka mu simenti, gypsum, putty powder ndi zipangizo zina, zomwe zingathandize bwino kapangidwe ndi kusunga madzi a zipangizozo.
Makampani opanga mankhwala tsiku ndi tsiku: Mu sopo, zinthu zosamalira khungu, ma shampu ndi zinthu zina zamankhwala tsiku ndi tsiku, hydroxyethyl cellulose imagwiritsidwa ntchito ngati chokhuthala komanso chokhazikika kuti chikhale cholimba komanso chomveka bwino.
Utoto ndi Zophimba: Mu makampani opanga zophimba, hydroxyethyl cellulose imagwiritsidwa ntchito ngati chowonjezera komanso chowongolera rheology kuti chigwire bwino ntchito komanso kupewa kugwa.
Munda wa mankhwala: Mu mankhwala opangira mankhwala, hydroxyethyl cellulose ingagwiritsidwe ntchito ngati chomangirira, chokhuthala komanso choyimitsa mapiritsi kuti ikonze mawonekedwe otulutsa komanso kukhazikika kwa mankhwala.
Ngakhale kuti hydroxyethyl cellulose si chinthu chachilengedwe, zinthu zake zoyambira, cellulose, zimapezeka kwambiri m'zomera m'chilengedwe. Kudzera mu kusintha kwa mankhwala, cellulose yachilengedwe imatha kusinthidwa kukhala hydroxyethyl cellulose yokhala ndi magwiridwe antchito abwino kwambiri ndikugwiritsidwa ntchito m'mafakitale osiyanasiyana. Zomera zachilengedwe monga matabwa, thonje, fulakesi, ndi zina zotero zimapereka zinthu zambiri zopangira hydroxyethyl cellulose. Ndi kupita patsogolo kwa sayansi ndi ukadaulo komanso kuwonjezeka kwa kufunikira kwa mafakitale, njira yopangira hydroxyethyl cellulose ikukonzedwanso nthawi zonse, ndipo ikuyembekezeka kuwonetsa phindu lake lapadera m'magawo ambiri mtsogolo.
Nthawi yotumizira: Okutobala-23-2024