I-Hydroxyethyl Cellulose (HEC) yinto eqhelekileyo engeyo-ionic yamanzi enyibilikayo yepolymer ikhompawundi enokuqina okugqwesileyo, ukugcinwa kwamanzi, kunye neempawu zokwenza ifilimu. Ke ngoko, isetyenziswa kakhulu kwiingubo zokwaleka, iipeyinti zelatex, kunye neglu. I-Adhesives kunye namanye amashishini. Ipeyinti yeLatex yinxalenye ebalulekileyo yezinto zokuhlobisa izakhiwo zanamhlanje, kwaye ukongezwa kwe-HEC ayikwazi nje ukuphucula ukuzinza kwepeyinti ye-latex, kodwa nokuphucula ukusebenza kwayo yokwakha.
1. Iimpawu eziphambili ze-hydroxyethyl cellulose
I-Hydroxyethyl cellulose yipolymer enyibilikayo emanzini efunyenwe ngokuguqulwa kweekhemikhali kusetyenziswa i-cellulose yendalo njengento ekrwada. Iimpawu zayo eziphambili ziquka:
Ukuqina: I-HEC inesiphumo esihle sokuqina, esinokunyusa kakhulu i-viscosity yepeyinti ye-latex kwaye inike ipeyinti ye-latex egqwesileyo yethixotropy kunye ne-rheology, ngokwenza oko yenze iyunifomu kunye ne-coating exineneyo ngexesha lokwakha.
Ukugcinwa kwamanzi: I-HEC inokuthintela ngokufanelekileyo amanzi ukuba aphume ngokukhawuleza ngokukhawuleza kwipeyinti, ngaloo ndlela ukwandisa ixesha lokuvula ipeyinti ye-latex kunye nokuphucula ukomisa kunye neempawu zefilimu zefilimu yepeyinti.
Ukuzinza: I-HEC inozinzo olugqwesileyo lweekhemikhali kwimizobo yepeyinti ye-latex, inokuxhathisa imiphumo yokutshintsha kwe-pH, kwaye ayinayo impendulo engalunganga kwezinye izithako kwipeyinti (ezifana ne-pigments kunye ne-fillers).
Umgangatho: Ngokulungelelanisa ubungakanani be-HEC, umbane kunye nomgangatho wepeyinti ye-latex inokuphuculwa, kwaye iingxaki ezifana ne-sagging kunye ne-brush marks kwifilimu yepeyinti inokuphetshwa.
Ukunyamezela ityuwa: I-HEC inokunyamezela okuthile kwi-electrolytes, ngoko isenako ukugcina ukusebenza kakuhle kwimiqulu equkethe iityuwa okanye ezinye i-electrolytes.
2. Indlela yokusebenza ye-hydroxyethyl cellulose kwipende ye-latex
Njengokuqina kunye nokuzinzisa, eyona ndlela iphambili yesenzo se-hydroxyethyl cellulose kwipeyinti yelatex inokuhlalutywa kule miba ilandelayo:
(1) Ukuqina kwesiphumo
I-HEC ichithwa ngokukhawuleza emanzini kwaye yenza isisombululo esicacileyo, esibonakalayo. Ngokwenza iibhondi ze-hydrogen kunye neemolekyuli zamanzi, ii-molecule ze-HEC zityhila kwaye zandise i-viscosity yesisombululo. Ngokulungelelanisa inani le-HEC, i-viscosity yepeyinti ye-latex inokulawulwa ngokuchanekileyo ukufezekisa ukusebenza kakuhle kokwakhiwa. Umphumo wokuqina we-HEC unxulumene nobunzima bayo bemolekyuli. Ngokubanzi, ukuphakama kobunzima bemolekyuli, kokukhona kubaluleke ngakumbi ukutyeba.
(2) Ukuzinzisa umphumo
Kukho inani elikhulu le-emulsions, ii-pigments kunye nezihluzi kwipeyinti ye-latex, kunye nokusebenzisana phakathi kwala macandelo kunokwenzeka, kubangele i-delamination okanye imvula yepeyinti ye-latex. Njenge-colloid ekhuselayo, i-HEC inokwenza inkqubo ye-sol ezinzileyo kwisigaba samanzi ukukhusela ii-pigments kunye nezizaliso zokuhlalisa. Ukongezelela, i-HEC inokumelana kakuhle nokutshintsha kweqondo lokushisa kunye ne-shear force, ngoko inokuqinisekisa ukuzinza kwepeyinti ye-latex ngexesha lokugcinwa kunye nokwakhiwa.
(3) Ukuphucula ukwakhiwa
Ukusebenza kwesicelo sepeyinti ye-latex kuxhomekeke kakhulu kwiimpawu zayo ze-rheological. Ngokuqiniswa kunye nokuphucula i-rheology, i-HEC inokuphucula ukusebenza kwe-anti-sag yepeyinti ye-latex, evumela ukuba isasazeke ngokulinganayo kwiindawo ezithe nkqo kunye nokwenza ukuba kuncinci ukuhamba. Ngelo xesha, i-HEC inokwandisa ixesha lokuvula ipeyinti ye-latex, ukunika abasebenzi bokwakha ixesha elingakumbi lokwenza ukuguqulwa kunye nokunciphisa amanqaku ebrashi kunye namanqaku okuhamba.
3. Uyongeza njani i-hydroxyethyl cellulose kwipeyinti ye-latex
Ukuze usebenzise ngokupheleleyo isiphumo se-hydroxyethyl cellulose, indlela yokongeza echanekileyo ibalulekile. Ngokubanzi, ukusetyenziswa kweHEC kwipeyinti yelatex kubandakanya la manyathelo alandelayo:
(1) Ukuchithwa kwangaphambili
Ekubeni i-HEC inyibilika ngokukhawuleza emanzini kwaye ijwayele ukuxutywa, ngokuqhelekileyo kucetyiswa ukuba i-HEC ichithe kwangaphambili emanzini ukwenza isisombululo esifanayo se-colloidal ngaphambi kokusetyenziswa. Xa unyibilika, i-HEC kufuneka yongezwe ngokucothayo kwaye ishukunyiswe ngokuqhubekayo ukuthintela i-agglomeration. Ukulawula ubushushu bamanzi ngexesha lenkqubo yokutshatyalaliswa kubaluleke kakhulu. Ngokuqhelekileyo kunconywa ukwenza ukutshatyalaliswa kwiqondo lokushisa kwe-20-30 ° C ukuphepha ukushisa kwamanzi okugqithisileyo okuchaphazela isakhiwo se-molecular of HEC.
(2) Yongeza ucwangco
Kwinkqubo yokuvelisa ipeyinti ye-latex, i-HEC yongezwa ngokuqhelekileyo ngexesha le-pulping stage. Xa ulungiselela ipeyinti ye-latex, ii-pigments kunye neefayili ziqala ukuchithwa kwinqanaba lamanzi ukuze zenze i-slurry, kwaye emva koko isisombululo se-HEC se-colloidal songezwa ngexesha le-dispersion stage ukuqinisekisa ukuba sinokusasazwa ngokulinganayo kuyo yonke inkqubo. Ixesha lokongeza i-HEC kunye nokuqina kokuvuselela kuya kuchaphazela umphumo wayo wokuqina, ngoko kufuneka uhlengahlengiso ngokweemfuno zenkqubo ethile kwimveliso yangempela.
(3) Ukulawulwa komthamo
Isixa se-HEC sinempembelelo ngqo ekusebenzeni kwepeyinti ye-latex. Ngokuqhelekileyo, inani elongezelelweyo le-HEC li-0.1% -0.5% yexabiso elipheleleyo lepeyinti ye-latex. I-HEC encinci kakhulu iya kubangela ukuba umphumo wokuqina ube yinto engabalulekanga kwaye ipeyinti ye-latex ibe yinto yamanzi, ngelixa i-HEC eninzi kakhulu iya kubangela ukuba i-viscosity ibe phezulu kakhulu, echaphazela ukusebenza. Ngoko ke, kwizicelo eziphathekayo, i-dosage ye-HEC idinga ukulungiswa ngokufanelekileyo ngokwefomula ethile kunye neemfuno zokwakhiwa kwepeyinti ye-latex.
4. Imizekelo yokusetyenziswa kwe-hydroxyethyl cellulose kwipende ye-latex
Kwimveliso yokwenyani, iHEC isetyenziswe ngokubanzi kwiintlobo ezahlukeneyo zeepeyinti zelatex, ezinje:
Ipeyinti ye-latex yodonga lwangaphakathi: Ukuqina kunye nokugcina amanzi kwiipropathi ze-HEC zenza ukuba iphucule ngokubonakalayo umgangatho kunye neempawu ezichasayo zefilimu yepeyinti kwipeyinti ye-latex yodonga lwangaphakathi, ngakumbi kwiindawo ezinobushushu obuphezulu apho isenokugcina ukusebenza kakuhle.
Ipeyinti ye-latex yodonga lwangaphandle: Ukuzinza kunye nokuxhathisa ityuwa ye-HEC kwenza ukuba kuphuculwe isimo sezulu kunye nokumelana nokuguga kwipeyinti ye-latex yangaphandle kunye nokwandisa ubomi benkonzo yefilimu yepeyinti.
Ipeyinti ye-latex ye-Anti-mildew: I-HEC inokusasaza ngokufanelekileyo i-agent ye-anti-mildew kwipende ye-latex ye-anti-mildew kunye nokuphucula ukufana kwayo kwifilimu yepeyinti, ngaloo ndlela iphucula i-anti-mildew effect.
Njengesongezo sepeyinti yelatex egqwesileyo, i-hydroxyethyl cellulose inokuphucula kakhulu ukusebenza kwepeyinti yelatex ngokujiya kwayo, ukugcinwa kwamanzi, kunye neziphumo zokuzinzisa. Kwizicelo ezisebenzayo, ukuqonda okufanelekileyo kwendlela yokongeza kunye nedosi ye-HEC kunokuphucula kakhulu ukwakhiwa kunye nokusetyenziswa kwefuthe lepeyinti ye-latex.
Ixesha lokuposa: Oct-22-2024