1. Isishwankathelo seNgxaki
Iselulosi yeHydroxyethyl (HEC)i-thickener kunye ne-rheology modifier esetyenziswa ngokubanzi kwipeyinti ye-latex, enokuphucula i-viscosity, ukulinganisa kunye nokuzinza kokugcinwa kwepeyinti. Nangona kunjalo, kwizicelo ezisebenzayo, i-HEC ngamanye amaxesha ikhawuleza ukwenza iikristale, ezichaphazela ukubonakala, ukusebenza kokwakhiwa kunye nokuzinza kokugcinwa kwepeyinti.
2. Uhlalutyo lwezizathu zokubunjwa kwekristale
Ukutshatyalaliswa okungonelanga: Ukuchithwa kwe-HEC emanzini kufuna iimeko ezithile zokuvuselela kunye nexesha. Ukunganyibiliki ngokwaneleyo kunokukhokelela ekugqithiseni kwendawo, oko kwenza imvula yekristale.
Ingxaki yobulunga bamanzi: Ukusebenzisa amanzi aqinileyo okanye amanzi anobumdaka obuninzi kuya kubangela ukuba i-HEC idibane nee-ion zesinyithi (ezifana neCa²⁺, Mg²⁺) zenze imisinga enganyibilikiyo.
Ifomula engazinzanga: Ezinye izongezo kwifomula (ezifana nezigcini, ii-dispersants) zinokusabela ngokungahambisani ne-HEC, zibangele ukuba imvula kwaye yenze iikristale.
Iimeko ezingafanelekanga zokugcina: Ukushisa okugqithisileyo okanye ukugcinwa kwexesha elide kunokubangela ukuba i-HEC iphinde idibanise okanye idibanise, ngokukodwa kwiqondo lokushisa eliphezulu kunye neendawo eziphezulu zokufuma.
Utshintsho lwexabiso le-pH: I-HEC inovelwano kwi-pH, kwaye iindawo ezine-acidic kakhulu okanye i-alkaline inokutshabalalisa ibhalansi yayo yokuchithwa kwaye ibangele i-crystal precipitation.
3. Izisombululo
Ukuphendula ezi ngxaki zingasentla, la manyathelo alandelayo anokuthathwa ukuphepha okanye ukunciphisa into eyenziwa yi-HEC yokuvelisa iikristale kwipeyinti ye-latex:
Yandisa indlela yokuchithwa kwe-HEC
Sebenzisa indlela yangaphambi kokusasazwa: qala ngokucotha ufefe i-HEC emanzini phantsi kwesantya esisezantsi esishukumisayo ukuthintela i-agglomeration ebangelwa lugalelo ngqo; uze uyiyeke ime ngaphezu kwemizuzu engama-30 ukuyimanzisa ngokupheleleyo, kwaye ekugqibeleni uyishukumise ngesantya esiphezulu ide inyibilike ngokupheleleyo.
Sebenzisa indlela yokutshatyalaliswa kwamanzi ashushu: ukuchithwa kwe-HEC kumanzi afudumele kwi-50-60 ℃ kunokukhawulezisa inkqubo yokuchithwa, kodwa ugweme amaqondo okushisa aphezulu kakhulu (ngaphezu kwe-80 ℃), ngaphandle koko kunokubangela ukuthotywa kwe-HEC.
Sebenzisa i-co-solvents efanelekileyo, njengexabiso elincinci le-ethylene glycol, i-propylene glycol, njl., Ukukhuthaza ukuchithwa kwe-uniform ye-HEC kunye nokunciphisa i-crystallization ebangelwa ukuxinwa kwendawo.
Ukuphucula umgangatho wamanzi
Sebenzisa amanzi adiyoni okanye athanjisiwe endaweni yamanzi etephu eqhelekileyo ukunciphisa ukuphazamiseka kweeyoni zentsimbi.
Ukongeza inani elifanelekileyo le-agent ye-chelating (efana ne-EDTA) kwifomula yepeyinti ye-latex inokuzinzisa ngokufanelekileyo isisombululo kunye nokukhusela i-HEC ekuphenduleni ngee-ion zetsimbi.
Lungiselela uyilo lwefomula
Gwema izongezo ezingahambelaniyo ne-HEC, njengezigcini ezithile ezinetyuwa ephezulu okanye izisasazi ezithile ezithile. Kucetyiswa ukwenza uvavanyo lokuhambelana ngaphambi kokusetyenziswa.
Lawula ixabiso le-pH yepeyinti ye-latex phakathi kwe-7.5-9.0 ukukhusela i-HEC ekubeni imvula ngenxa yokuguquguquka okukhulu kwe-pH.
Lawula iimeko zokugcina
Indawo yokugcina ipeyinti yelatex kufuneka igcine iqondo lobushushu eliphakathi (5-35℃) kwaye unqande ixesha elide ubushushu obuphezulu okanye obuphantsi.
Gcina itywiniwe ukukhusela ukukhuphuka komswakama okanye ukungcola, ugweme ukunyuka kwendawo kwi-HEC yoxinaniso ngenxa ye-volatilization ye-solvent, kunye nokukhuthaza i-crystallization.
Khetha uhlobo oluchanekileyo lwe-HEC
Iindidi ezahlukeneyo ze-HEC zineeyantlukwano kwi-solubility, viscosity, njl. Kunconywa ukuba ukhethe i-HEC enezinga eliphezulu lokutshintshwa kunye ne-viscosity ephantsi ukunciphisa ukuthambekela kwayo kwi-crystallize kwiindawo eziphezulu.
Ngokwandisa indlela yokupheliswa kweI-HEC, ukuphucula umgangatho wamanzi, ukulungiswa kwefomula, ukulawula indawo yokugcina kunye nokukhetha iindidi ezifanelekileyo ze-HEC, ukubunjwa kweekristale kwipeyinti ye-latex kunokuphetshwa ngokufanelekileyo okanye kuncitshiswe, ngaloo ndlela kuphuculwe ukuzinza kunye nokusebenza kokwakhiwa kwepeyinti ye-latex. Kwinkqubo yokuvelisa ngokwenene, uhlengahlengiso olujoliswe kuyo kufuneka lwenziwe ngokweemeko ezithile ukuqinisekisa umgangatho wemveliso kunye namava omsebenzisi.
Ixesha lokuposa: Mar-26-2025