Ama-thickeners kapende we-latex kumele ahambisane kahle namakhompiyutha e-latex polymer, ngaphandle kwalokho kuzoba nenani elincane lokuthungwa kufilimu enamathelayo, futhi ukuhlanganiswa kwezinhlayiyana okungenakuhlehliswa kuzokwenzeka, okuholela ekwehleni kwe-viscosity kanye nosayizi wezinhlayiyana ezinkulu.Ama-thickeners azoshintsha ukukhokhiswa kwe-emulsion.Isibonelo, izingqimba ze-cationic zizoba nomthelela ongahlehliseki kuma-anionic emulsifiers futhi zidale ukukhishwa kwe-demulsification.I-latex thickener yepende efanelekile kufanele ibe nalezi zinto ezilandelayo:
1. Umthamo ophansi kanye ne-viscosity enhle
2. Ukuzinza okuhle kwesitoreji, ngeke kunciphise i-viscosity ngenxa yesenzo sama-enzyme, futhi ngeke kunciphise i-viscosity ngenxa yokushintsha kwezinga lokushisa kanye nenani le-pH.
3. Ukugcinwa kahle kwamanzi, awekho amabhamuza omoya asobala
4. Ayikho imiphumela engemihle ezakhiweni zefilimu kapende njengokumelana nokukhuhla, i-gloss, amandla okufihla kanye nokumelana namanzi
5. Akukho flocculation of pigments
Ubuchwepheshe bokuqina bokupenda kwe-latex kuyisinyathelo esibalulekile sokuthuthukisa ikhwalithi ye-latex nokunciphisa izindleko.I-Hydroxyethyl cellulose iyi-thickener ekahle, enemiphumela eminingi ekusebenzeni kokuqina, ukuqiniswa kanye nokulungiswa kwe-rheological kapende we-latex.
Enqubweni yokukhiqiza upende we-latex, i-hydroxyethyl cellulose (HEC) isetshenziswa njenge-ejenti yokumisa i-disperant, thickener kanye ne-pigment ukuze kuqiniswe i-viscosity yomkhiqizo, ukunciphisa i-agglomeration, ukwenza ifilimu kapende ibushelelezi futhi ibushelelezi, nokwenza upende we-latex uhlale isikhathi eside. .I-rheology enhle, ingamelana namandla aphezulu e-shear, futhi ingahlinzeka ngokulingana okuhle, ukumelana nokuklwebheka kanye nokufana kwe-pigment.Ngesikhathi esifanayo, i-HEC ikwazi ukusebenza kahle kakhulu, futhi upende we-latex ogqinsiwe nge-HEC une-pseudoplasticity, ngakho-ke ukuxubha, ukugoqa, ukugcwalisa, ukufutha nezinye izindlela zokwakha kunezinzuzo zokonga umsebenzi, akulula ukusula, ukugoqa, nokuchafaza kancane.I-HEC inokuthuthukiswa kombala okuhle kakhulu.Ine-miscibility enhle kakhulu yama-colorants amaningi nama-binders, okwenza upende we-latex ube nokuvumelana kombala okuhle kakhulu nokuzinza.Ukuhlukahluka kokusetshenziswa ekwakhiweni, i-ether engeyona i-ionic.Ngakho-ke, ingasetshenziswa kububanzi be-pH ebanzi (2~12), futhi ingaxutshwa nezingxenye ezikupende okuvamile kwe-latex njengemibala esebenzayo, izithasiselo, usawoti omncibilikayo noma ama-electrolyte.
Awukho umthelela omubi kwifilimu yokumboza, ngoba isixazululo samanzi se-HEC sinezici ezicacile zokungezwani kwamanzi, akulula ukukhiya amagwebu ngesikhathi sokukhiqiza nokwakhiwa, futhi ukuthambekela kwezimbobo zentaba-mlilo namaphinikhodi kuncane.
Ukuzinza okuhle kwesitoreji.Ngesikhathi sokugcina isikhathi eside, ukuhlakazeka nokumiswa kwe-pigment kungagcinwa, futhi ayikho inkinga yombala ontantayo nokuqhakaza.Kukhona ungqimba lwamanzi oluncane ebusweni bopende, futhi lapho izinga lokushisa lokugcina lishintsha kakhulu.I-viscosity yayo isalokhu izinzile.
I-HEC ingakhuphula inani le-PVC (i-pigment volume concentration) ukwakheka okuqinile kuze kufike ku-50-60%.Ngaphezu kwalokho, i-surface coating thickener kapende osuselwe emanzini nawo angasebenzisa i-HEC.
Njengamanje, ama-thickeners asetshenziswa kupende we-latex ophakathi nendawo nasezingeni eliphezulu angeniswa kwamanye amazwe i-HEC ne-acrylic polymer (kuhlanganise ne-polyacrylate, i-homopolymer noma i-copolymer emulsion thickeners ye-acrylic acid ne-methacrylic acid) ama-thickeners.
I-Hydroxyethyl cellulose ingasetshenziselwa
1. Njengeglue elihlakazayo noma elivikelayo
Ngokuvamile, i-HEC ene-viscosity ye-10-30mPaS isetshenziswa.I-HEC engasetshenziswa kufika ku-300mPa·S izoba nomthelela ongcono wokuhlakazeka uma isetshenziswa ngokuhambisana nama-anionic noma ama-cationic surfactants.Umthamo wereferensi ngokuvamile ungu-0.05% wesisindo se-monomer.
2. Njengomuthi wokujiya
Sebenzisa i-15000mPa.Isilinganiso sereferensi se-HEC ephezulu ye-viscosity ngenhla ngu-0.5-1% yenani eliphelele lopende we-latex, futhi inani le-PVC lingafinyelela cishe ku-60%.Sebenzisa i-HEC engaba ngu-20Pa,s kupende we-latex, futhi ukusebenza kopende we-latex kuhamba phambili.Izindleko zokusebenzisa i-HEC ngaphezu kuka-30O00Pa.s ziphansi.Kodwa-ke, izakhiwo zokulinganisa zopende we-latex azilungile.Ngokombono wezidingo zekhwalithi nokwehliswa kwezindleko, kungcono ukusebenzisa i-HEC ye-viscosity ephakathi nendawo nephezulu ndawonye.
3. Indlela yokuxuba ngopende we-latex
I-HEC efakwe endaweni engaphezulu ingafakwa kwimpushana eyomile noma ifomu lokunamathisela.I-powder eyomile yengezwa ngokuqondile ekugayeni kwe-pigment.I-pH endaweni yokudla kufanele ibe ngu-7 noma ngaphansi.Izingxenye ze-alkaline ezifana ne-Yanbian dispersant zingangezwa ngemva kokuba i-HEC isimanzisiwe futhi ihlakazwe ngokugcwele.Ama-slurries enziwe nge-HEC kufanele ahlanganiswe ku-slurry ngaphambi kokuba i-HEC ibe nesikhathi esanele sokukhipha amanzi futhi ivumele ukushuba esimweni esingenakusebenziseka.Kungenzeka futhi ukulungisa i-HEC pulp nge-ethylene glycol coalescing agents.
4. I-anti-mold yepende ye-latex
I-HEC encibilika emanzini izowohloka lapho ihlangana nezibungu ezinemiphumela ekhethekile ku-cellulose kanye nokuphuma kwayo.Akwanele ukwengeza ama-preservatives kupende kuphela, zonke izingxenye kufanele zingabi nama-enzyme.Imoto ekhiqiza upende we-latex kufanele igcinwe ihlanzekile, futhi zonke izinto ezisetshenziswayo kufanele zihlale zibulala amagciwane nge-steam 0.5% formalin noma i-O.1% mercury solution.
Isikhathi sokuthumela: Dec-26-2022