I. Chiyambi
Hydroxyethyl Cellulose (HEC) ndi polima osasungunuka m'madzi omwe amagwiritsidwa ntchito kwambiri pochotsa mafuta, zokutira, zomanga, mankhwala atsiku ndi tsiku, kupanga mapepala ndi zina. HEC imapezeka ndi kusintha kwa mankhwala a cellulose, ndipo katundu wake ndi ntchito zake zimatsimikiziridwa makamaka ndi hydroxyethyl substituents pa ma cellulose.
II. Njira yopanga
Kupanga kwa HEC makamaka kumaphatikizapo njira zotsatirazi: cellulose etherification, kutsuka, kutaya madzi m'thupi, kuyanika ndi kugaya. Zotsatirazi ndizofotokozera mwatsatanetsatane pa sitepe iliyonse:
Cellulose etherification
Ma cellulose amayamba kuthandizidwa ndi alkali kupanga alkali cellulose (Cellulose Alkali). Izi zimachitika kawirikawiri mu riyakitala, ntchito sodium hydroxide njira kuchitira masoka mapadi kupanga alkali mapadi. Chemical reaction ndi motere:
Selo-OH+NaOH→Cell-O-Na+H2OCell-OH+NaOH→Cell-O-Na+H 2O
Kenako, cellulose ya alkali imakhudzidwa ndi ethylene oxide kupanga hydroxyethyl cellulose. Zomwe zimachitikazo zimachitika mopanikizika kwambiri, nthawi zambiri 30-100 ° C, ndipo zomwe zimachitika motere:
Cell-O-Na+CH2CH2O→Cell-O-CH2CH2OHCell-O-Na+CH 2CH 2O→Cell-O-CH 2CH 2OH
Izi zimafuna kuwongolera bwino kutentha, kuthamanga ndi kuchuluka kwa ethylene oxide yomwe imawonjezeredwa kuti zitsimikizire kufanana ndi mtundu wa mankhwalawo.
Kusamba
Zotsatira za HEC zosakayikitsa nthawi zambiri zimakhala ndi alkali, ethylene oxide ndi zinthu zina, zomwe zimafunika kuchotsedwa ndi kutsuka kwamadzi kangapo kapena kutsuka kosungunulira kwa organic. Madzi ochuluka amafunikira panthawi yotsuka madzi, ndipo madzi onyansa akatsuka amafunika kutsukidwa ndi kutulutsidwa.
Kutaya madzi m'thupi
HEC yonyowa pambuyo posamba iyenera kutayidwa, kawirikawiri ndi kusefera kwa vacuum kapena kupatukana kwa centrifugal kuti muchepetse chinyezi.
Kuyanika
HEC yopanda madzi m'thupi imawumitsidwa, nthawi zambiri ndi kuyanika kapena kuyanika. Kutentha ndi nthawi ziyenera kuyendetsedwa mosamalitsa panthawi yowumitsa kuti zisawonongeke kutentha kapena kusakanikirana.
Kupera
Chowumitsa cha HEC chouma chiyenera kudulidwa ndi kusefa kuti chikwanitse kugawidwa kwa tinthu ting'onoting'ono, ndipo potsiriza kupanga ufa kapena mankhwala a granular.
III. Makhalidwe amachitidwe
Kusungunuka kwamadzi
HEC ili ndi madzi abwino osungunuka ndipo imatha kusungunuka mwamsanga m'madzi ozizira komanso otentha kuti apange njira yowonekera kapena yowonekera. Katundu wosungunula uku kumapangitsa kuti azigwiritsidwa ntchito kwambiri ngati thickener ndi stabilizer mu zokutira ndi mankhwala tsiku lililonse.
Kukhuthala
HEC imasonyeza mphamvu yowonjezera yowonjezera mu njira yamadzimadzi, ndipo kukhuthala kwake kumawonjezeka ndi kuwonjezeka kwa kulemera kwa maselo. Katundu wokhuthalawa amathandizira kuti pakhale kukhuthala, kusunga madzi ndikuwongolera ntchito yomanga mu zokutira zokhala ndi madzi komanso zomangira matope.
Rheology
HEC amadzimadzi yothetsera ali wapadera rheological katundu, ndipo mamasukidwe akayendedwe ake amasintha ndi kusintha kukameta ubweya mlingo, kusonyeza kukameta ubweya kupatulira kapena pseudoplasticity. Katunduyu wa rheological amamuthandiza kuti azitha kusintha magwiridwe antchito ndikumanga mu zokutira ndi madzi akubowola pamafuta.
Emulsification ndi kuyimitsidwa
HEC ali wabwino emulsification ndi kuyimitsidwa katundu, amene angathe kukhazikika inaimitsidwa particles kapena m'malovu mu dongosolo kubalalitsidwa kupewa stratification ndi sedimentation. Choncho, HEC nthawi zambiri amagwiritsidwa ntchito pazinthu monga zokutira emulsion ndi kuyimitsidwa kwa mankhwala.
Biodegradability
HEC ndi yochokera ku cellulose yachilengedwe yokhala ndi biodegradability yabwino, yopanda kuipitsa chilengedwe, ndipo imakwaniritsa zofunikira pakuteteza chilengedwe chobiriwira.
IV. Minda Yofunsira
Zopaka
Mu zokutira zokhala ndi madzi, HEC imagwiritsidwa ntchito ngati thickener ndi stabilizer kupititsa patsogolo fluidity, ntchito yomanga ndi anti-sagging katundu zokutira.
Zomangamanga
Pazomangira, HEC imagwiritsidwa ntchito mumatope opangidwa ndi simenti ndi putty kuti apititse patsogolo ntchito yomanga komanso kusunga madzi.
Daily Chemicals
Mu zotsukira, ma shampoos, ndi otsukira mano, HEC imagwiritsidwa ntchito ngati thickener ndi stabilizer kupititsa patsogolo kumverera ndi kukhazikika kwa mankhwala.
Malo Opangira Mafuta
Pobowola mafuta ndi madzi ophwanyidwa, HEC imagwiritsidwa ntchito posintha ma rheology ndi kuyimitsidwa kwamadzi obowola ndikuwongolera bwino pakubowola komanso chitetezo.
Kupanga mapepala
Popanga mapepala, HEC imagwiritsidwa ntchito poyang'anira zamkati zamadzimadzi ndikuwongolera mawonekedwe ndi mawonekedwe a pepala.
Hydroxyethyl cellulose (HEC) yakhala ikugwiritsidwa ntchito kwambiri m'mafakitale ambiri chifukwa cha kusungunuka kwake bwino m'madzi, kukhuthala, rheological properties, emulsification ndi kuyimitsidwa, komanso biodegradability yabwino. Kapangidwe kake kamakhala kokhwima. Kupyolera mu masitepe a cellulose etherification, kutsuka, kutaya madzi m'thupi, kuyanika ndi kupera, mankhwala a HEC okhala ndi ntchito yokhazikika komanso abwino akhoza kukonzekera. M'tsogolomu, ndikuwongolera zofunikira zachitetezo cha chilengedwe komanso kupita patsogolo kwaukadaulo, chiyembekezo chogwiritsa ntchito HEC chidzakhala chokulirapo.
Nthawi yotumiza: Jul-02-2024