Hydroxyethyl cellulose (HEC) ndi yoyera kapena yachikasu chopepuka, yopanda fungo, yopanda poizoni, kapena yolimba ngati ufa. Imapangidwa ndi thonje losaphika kapena zamkati zoyengedwa bwino zomwe zimanyowa mu 30% yamadzimadzi a caustic soda. Pakatha theka la ola, imachotsedwa ndikukanikizidwa. Finyani mpaka chiŵerengero cha madzi a alkaline chifike pa 1:2.8, kenako chimaphwanyidwa. Imakonzedwa ndi etherification reaction ndipo ndi ya non-ionic soluble cellulose ethers. Hydroxyethyl cellulose ndi chinthu chofunikira kwambiri mu utoto wa latex. Tiyeni tikambirane momwe tingagwiritsire ntchito hydroxyethyl cellulose HEC mu utoto wa latex ndi njira zodzitetezera.
1. Yokhala ndi mowa wochuluka woti mugwiritse ntchito: choyamba gwiritsani ntchito hydroxyethyl cellulose HEC kuti mukonze mowa wochuluka wochuluka, kenako muyiike pa chinthucho. Ubwino wa njira iyi ndikuti imakhala yosinthasintha kwambiri ndipo imatha kuwonjezeredwa mwachindunji ku chinthu chomalizidwa, koma iyenera kusungidwa bwino. Masitepe a njira iyi ndi ofanana ndi masitepe ambiri mu njira yachiwiri; kusiyana kwake ndikuti palibe chifukwa chogwiritsa ntchito choyambitsa kutentha kwambiri, ndipo ma agitator ena okha omwe ali ndi mphamvu zokwanira kuti hydroxyethyl cellulose ifalikire mofanana mu yankho ndi omwe angapitirire popanda kuyimitsa. Sakanizani mpaka itasungunuka kwathunthu mu yankho lolimba. Komabe, ziyenera kudziwika kuti fungicide iyenera kuwonjezeredwa ku mowa wochuluka mwachangu momwe zingathere.
2. Onjezani mwachindunji panthawi yopanga: njira iyi ndi yosavuta ndipo imatenga nthawi yochepa kwambiri. Onjezani madzi oyera mu chidebe chachikulu chokhala ndi chosakanizira champhamvu. Yambani kusakaniza mosalekeza pa liwiro lotsika ndipo pang'onopang'ono sefa hydroxyethyl cellulose mu yankho mofanana. Pitirizani kusakaniza mpaka tinthu tonse titanyowa. Kenako onjezerani zosungira ndi zowonjezera zosiyanasiyana. Monga utoto, zosakaniza zobalalitsira, madzi a ammonia, ndi zina zotero. Sakanizani mpaka hydroxyethyl cellulose HEC yonse isungunuke kwathunthu (kukhuthala kwa yankho kumawonjezeka momveka bwino) kenako onjezerani zigawo zina mu fomula yochitirapo kanthu.
Popeza hydroxyethyl cellulose HEC yokonzedwa pamwamba ndi yolimba ngati ufa kapena ulusi, pokonzekera mowa wa hydroxyethyl cellulose, samalani mfundo zotsatirazi:
(1) Mukamagwiritsa ntchito hydroxyethyl cellulose HEC yokhala ndi kukhuthala kwakukulu, kuchuluka kwa mowa wothira sikuyenera kupitirira 2.5-3% (potengera kulemera), apo ayi mowa wothira udzakhala wovuta kuugwiritsa ntchito.
(2) Musanawonjezere hydroxyethyl cellulose HEC komanso mutatha kuigwiritsa ntchito, iyenera kusunthidwa mosalekeza mpaka yankholo litawonekera bwino komanso lomveka bwino.
(3) Momwe mungathere, onjezerani mankhwala ophera bowa pasadakhale.
(4) Kutentha kwa madzi ndi pH ya madzi zimaonekeratu kuti zikugwirizana ndi kusungunuka kwa hydroxyethyl cellulose, choncho chisamaliro chapadera chiyenera kuperekedwa.
(5) Musawonjezere zinthu zina zamchere mu chisakanizocho musananyowetse ufa wa hydroxyethyl cellulose ndi madzi. Kukweza pH mukatha kunyowa kumathandiza kusungunuka.
(6) Iyenera kusefedwa pang'onopang'ono mu thanki yosakanizira, ndipo musawonjezere kuchuluka kwakukulu kapena kuwonjezera mwachindunji hydroxyethyl cellulose yomwe yapanga mikwingwirima ndi mipira mu thanki yosakanizira.
Zinthu zofunika kwambiri zomwe zimakhudza kukhuthala kwa utoto wa latex:
(1) Kuwonongeka kwa chokhuthala ndi tizilombo toyambitsa matenda.
(2) Mu njira yopangira utoto, kodi ndondomeko yowonjezerapo chinthu chokhuthala ndi yoyenera?
(3) Ngati kuchuluka kwa choyambitsa pamwamba ndi madzi omwe agwiritsidwa ntchito mu fomula ya utoto kuli koyenera.
(4) Chiŵerengero cha kuchuluka kwa zinthu zina zachilengedwe zokhuthala ndi kuchuluka kwa hydroxyethyl cellulose mu utoto wopangidwa.
(5) Pamene latex ipangidwa, kuchuluka kwa ma catalyst otsala ndi ma oxide ena kumawonjezeka.
(6) Kutentha kumakhala kokwera kwambiri panthawi yobalalitsa chifukwa cha kusakaniza kwambiri.
(7) Mpweya wambiri ukatsala mu utoto, kukhuthala kwake kumawonjezeka.
Kukhuthala kwa hydroxyethyl cellulose HEC kumasintha pang'ono mu pH ya 2-12, koma kukhuthala kumachepa kupitirira muyeso uwu. Ili ndi mphamvu zokhuthala, kuimitsa, kumangirira, kusakaniza, kufalitsa, kusunga chinyezi ndi kuteteza colloid. Mayankho m'mitundu yosiyanasiyana ya kukhuthala amatha kukonzedwa. Osakhazikika pansi pa kutentha kwabwinobwino ndi kupanikizika, pewani chinyezi, kutentha, ndi kutentha kwakukulu, ndipo ali ndi kusungunuka kwa mchere kwabwino kwambiri ku dielectrics, ndipo yankho lake lamadzi limaloledwa kukhala ndi mchere wambiri ndipo limakhalabe lokhazikika.
Nthawi yotumizira: Epulo-01-2023