Iimveliso zeVithamini zonke ziphuma kwi-pulp yendalo yomqhaphu okanye i-pulp yomthi, eveliswa nge-etherification. Iimveliso ezahlukeneyo zeselulosi zisebenzisa i-etherifying agents ezahlukeneyo. I-agent etherifying esetyenziswe kwi-hydroxyethyl cellulose (HEC) i-ethylene oxide, kunye ne-etherifying agent esetyenziswa kwi-hydroxypropyl methylcellulose (HPMC) ezinye iintlobo ze-etherifying agents. (ichloromethane kunye nepropylene oxide).
Kwipeyinti ye-szone yokwenyani kunye nepeyinti ye-latex, i-hydroxyethyl cellulose ingasetyenziswa njenge-thickener.
Ipeyinti yamatye yokwenyani kulula ukukhawuleza ngenxa yobuninzi bayo be-aggregate kunye neenkcukacha ezinkulu. Kuyimfuneko ukongeza i-thickener yokwandisa i-viscosity yayo ukuhlangabezana ne-viscosity efunekayo yokutshiza ngexesha lokwakha, ukuphucula ukuzinza kwayo kokugcina, kunye nokufezekisa amandla athile.
Ukuba ufuna ipeyinti yamatye okwenene ukufezekisa amandla amahle, ukuchasana kwamanzi okulungileyo kunye nokuchasana kwemozulu, ukukhethwa kwezinto ezibonakalayo kunye noyilo lwefomula kubaluleke kakhulu.
Ngaphantsi kweemeko eziqhelekileyo, inani le-emulsion elisetyenziswe kwipeyinti yamatye esemgangathweni ephezulu iya kuba phezulu.
Umzekelo, kwitoni yepeyinti yamatye okwenene, kunokubakho i-300kg ye-emulsion ecocekileyo ye-acrylic kunye ne-650kg yesanti yamatye enemibala yendalo. Xa umxholo oqinileyo we-emulsion ungama-50%, umthamo we-300kg we-emulsion emva kokumisa malunga ne-150 ilitha, kunye nomthamo we-650kg yesanti malunga ne-228 ilitha. Oko kukuthi, i-PVC (i-pigment volume concentration) yepeyinti yamatye yokwenene yi-60% ngeli xesha, kuba amasuntswana entlabathi enemibala makhulu kwaye angaqhelekanga, kwaye phantsi kwemeko yokusabalalisa ubungakanani besuntswana elithile, elomileyo. Ipeyinti yamatye yangempela ingaba kwi-CPVC (i-critical mass concentration). I-pigment volume concentration) malunga. Ngokuphathelele kwi-thickener, ukuba ukhetha i-cellulose kunye ne-viscosity efanelekileyo, ipeyinti yamatye yokwenyani inokwenza ifilimu yepeyinti epheleleyo kunye nexineneyo ukuhlangabezana neemfuno ezintathu zokusebenza eziphambili zepeyinti yamatye yokwenyani. Ukuba umxholo we-emulsion yepeyinti yelitye lokwenyani uphantsi, kuyacetyiswa ukuba kusetyenziswe i-cellulose ene-viscosity ephezulu njenge-thickener (efana ne-100,000 viscosity), ngakumbi emva kokunyuka kwexabiso le-cellulose, elinokunciphisa inani le-cellulose elisetyenzisiweyo kwaye lenze ilitye lokwenyani Ukusebenza kwepeyinti kungcono.
Abanye abenzi bepeyinti yelitye lokwenyani bezoqoqosho basebenzisa i-hydroxypropyl methylcellulose endaweni ye-hydroxyethyl cellulose ngeendleko kunye nezinye izinto.
Xa kuthelekiswa neentlobo ezimbini zeselulosi, i-hydroxyethyl cellulose inokugcinwa kwamanzi okungcono, ayiyi kulahlekelwa ukugcinwa kwamanzi ngenxa ye-gelatin kwiqondo lokushisa eliphezulu, kwaye inokumelana nokubola okuthile. Ukuqwalaselwa kokusebenza, kucetyiswa ukusebenzisa i-hydroxyethyl cellulose kunye ne-viscosity ye-100,000 njenge-thickener yepeyinti yamatye yangempela.
Ixesha lokuposa: Apr-28-2023