Isithambisi sopende we-latex kumele sihambisane kahle ne-emulsion polymer compound, ngaphandle kwalokho ifilimu yokumboza izoba nenani elincane le-reticulate, futhi izokhiqiza i-reversible particle agglomeration, okuzonciphisa i-viscosity futhi kuqinise usayizi wezinhlayiya. Isithambisi sizoshintsha ukushaja kwe-emulsion. Isibonelo, isithambisi se-cationic sizoba nomthelela ongemuhle ku-anionic emulsifier ukuze siphule i-emulsion. Isithambisi esifanelekile sopende we-latex kumele sibe nezakhiwo ezilandelayo:
1. Isilinganiso esiphansi kanye nokuthamba okuhle
2. Ukuqina okuhle kwesitoreji, akukho ukwehla kwe-viscosity ngenxa yesenzo sama-enzyme, futhi akukho ukwehla kwe-viscosity ngenxa yezinguquko ekushiseni kanye nenani le-PH
3, ukugcinwa kwamanzi okuhle, akukho mkhuba osobala webhamuza
4. Akukho miphumela emibi ezimpahleni zefilimu njengokumelana nokukhuhla, ukucwebezela, amandla okufihla kanye nokumelana namanzi
5. Akukho ukugoba kombala
Ubuchwepheshe bokujiya kopende we-latex buyindlela ebalulekile yokuthuthukisa ikhwalithi ye-latex nokunciphisa izindleko. I-Hydroxyethyl cellulose iyisithako esifanelekile, esinemiphumela eminingi ekusebenzeni kokuqina, ukuzinza kanye nokulungiswa kwe-rheological kopende we-latex.
Enqubweni yokukhiqiza upende we-latex,i-hydroxyethyl cellulose (HEC)Isetshenziswa njenge-dispersant, thickener kanye ne-pigment smitting agent ukuze kuqiniswe i-viscosity yomkhiqizo, kuncishiswe i-agglomeration, kwenziwe ifilimu yopende ibe bushelelezi futhi ibushelelezi, futhi yenze upende we-latex uhlale isikhathi eside. I-rheology enhle, ingamelana namandla aphezulu okucheba, futhi ingahlinzeka ngokulingana okuhle, ukumelana nokuklwebheka kanye nokufana kombala. Ngesikhathi esifanayo, i-HEC inamandla okusebenza kahle kakhulu, kanti upende we-latex oqiniswe nge-HEC une-pseudoplasticity, ngakho-ke izindlela zokwakha ezifana nokuxubha, ukugoqa, ukugcwalisa, kanye nokufutha zinezinzuzo zokonga abasebenzi, akulula ukuwuhlanza nokuwa, kanye nokuchitha okuncane. I-HEC inokuthuthukiswa kombala okuhle kakhulu. Inokuguquguquka okuhle kakhulu ngezinhlobo eziningi zombala kanye nezihlanganisi, okwenza kube nokwenzeka ukwakha upende we-latex ngokuhambisana okuhle kombala kanye nokuqina. Njengoba isetshenziswa kakhulu ekwakhiweni, iyi-ether engeyona i-ionic. Ngakho-ke, ingasetshenziswa ebangeni elibanzi le-pH (2~12), futhi ingaxutshwa nezingxenye zopende we-latex ojwayelekile njenge-reactive pigments, izithasiselo, usawoti oncibilikayo noma ama-electrolyte.
Akukho mphumela omubi efilimini yokumboza. Ngenxa yokuthi isixazululo samanzi se-HEC sinezici ezicacile zokuxineka kwamanzi, akulula ukusenza sibe negwebu ngesikhathi sokukhiqiza nokwakha, futhi ukuthambekela kwemigodi yentaba-mlilo kanye nemigodi emincane kuncane.
Ukuqina okuhle kwesitoreji. Enqubweni yokugcina isikhathi eside, ukuhlakazeka nokumiswa kwe-pigment kungagcinwa, futhi akukho nkinga yombala ontantayo nokuqhakaza. Uma kunengqimba encane yamanzi ebusweni bopende kanye nokushisa kwesitoreji kushintsha kakhulu. Ukuqina kwayo kusazinzile.
I-HEC ingakhuphula inani le-PVC (ukuhlushwa kwevolumu ye-pigment) ukwakheka okuqinile kufikela ku-50-60%. Ngaphezu kwalokho, isithambisi se-topcoat sopende osekelwe emanzini singasebenzisa ne-HEC.
Njengamanje, izithisi ezisetshenziswa kupende we-latex wasekhaya wezinga eliphezulu zingama-polymer e-HEC nama-acrylic angeniswa kwamanye amazwe (kufaka phakathi ama-polyacrylates, ama-homopolymer noma ama-emulsion thickeners e-acrylic acid kanye ne-methacrylic acid).
I-Hydroxyethyl cellulose ingasetshenziswa
1. Njenge-dispersant noma i-glue evikelayo
Ngokuvamile, kusetshenziswa i-HEC ene-viscosity engu-10 kuya ku-30 mPaS. I-HEC efinyelela ku-300mPa·S ingasetshenziswa ngokuhlanganiswa nama-surfactants e-anionic noma e-cationic, futhi umphumela wokusabalala ungcono. Inani elibhekisela ngokuvamile lingu-0.05% wesisindo se-monomer.
2, njengesithambisi
Sebenzisa i-15000mPa. Isilinganiso sokubhekisela se-HEC ene-viscosity ephezulu ngaphezu kwe-s singu-0.5 kuya ku-1% wesisindo esiphelele se-latex coating, kanti inani le-PVC lingafinyelela cishe ku-60%. Kupende we-latex, kusetshenziswa i-HEC engama-Pa angama-20, futhi izakhiwo ezahlukahlukene zopende we-latex zingcono kakhulu. Izindleko zokusebenzisa nje i-HEC engaphezu kwama-Pa angama-30O00 ziphansi. Kodwa-ke, ukulingana nezinye izici zopende we-latex azilungile. Ngokombono wezidingo zekhwalithi kanye nokunciphisa izindleko, kungcono ukusebenzisa i-HEC ene-viscosity ephakathi nephezulu ndawonye.
3. Indlela yokufaka upende we-latex
I-HEC ehlungiwe ngaphezulu ingafakwa ngempuphu eyomile noma ngesimo se-slurry. Impuphu eyomile ifakwa ngqo ekugayweni kwe-pigment. I-pH yephuzu lokwengeza kufanele ibe ngu-7 noma ngaphansi. Izingxenye ze-alkaline ezifana nezihlakazi zingafakwa ngemva kokusetshenziswaI-HECsemanzisiwe futhi sahlakazeka ngokuphelele. I-slurry eyenziwe nge-HEC kufanele ihlanganiswe ne-slurry ngaphambi kokuba i-HEC ibe nesikhathi esanele sokumanzisa futhi iqine ibe sesimweni esingasetshenziswa. I-slurry ye-HEC ingalungiswa futhi ngama-agent e-coalescing asekelwe ku-glycol.
4. Upende we-latex olwa nokukhunta
Ukubola kwe-HEC okuncibilika emanzini uma kuvezwa ezikhumbeni eziqondene ne-cellulose kanye nezinto eziphuma kuyo. Ukwengeza izithasiselo kupende kuphela akwanele, zonke izingxenye kumele zingabi nama-enzyme. Izimoto zokukhiqiza upende we-latex kumele zigcinwe zihlanzekile futhi zicocekile, futhi yonke imishini kumele ihlanzwe njalo ngesisombululo se-0.5% formalin esinomusi noma isixazululo se-0.1% se-mercury.
Isikhathi sokuthunyelwe: Ephreli-25-2024