I-thickener yopende we-latex kufanele ihambisane kahle ne-emulsion polymer compound, ngaphandle kwalokho ifilimu yokugqoka izoba nenani elincane le-reticulate, futhi izokhiqiza i-agglomeration yezinhlayiyana ezingenakuhlehliswa, ezizonciphisa i-viscosity futhi zenze usayizi wezinhlayiyana. I-thickener izoshintsha ukukhokhiswa kwe-emulsion. Isibonelo, i-cationic thickener izoba nomthelela ongahlehliseki ku-anionic emulsifier ukuze iphule i-emulsion. I-thickener efanelekile yopende we-latex kufanele ibe nezinto ezilandelayo:
1. Umthamo ophansi kanye ne-viscosity enhle
2. Ukuzinza okuhle kwesitoreji, akukho ukuncishiswa kwe-viscosity ngenxa yesenzo sama-enzyme, futhi akukho ukuncishiswa kwe-viscosity ngenxa yokushintsha kwezinga lokushisa kanye nenani le-PH
3, ukugcinwa kahle kwamanzi, akukho mkhuba ocacile we-bubble
4. Ayikho imiphumela emibi ezakhiweni zefilimu ezifana nokumelana nokukhuhla, i-gloss, amandla okufihla kanye nokumelana namanzi
5. Ayikho i-pigment flocculation
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-dispersant, thickener kanye ne-pigment suspending agent ukuze kuqiniswe i-viscosity yomkhiqizo, ukunciphisa i-agglomeration, ukwenza ifilimu kapende ibushelelezi futhi ibushelelezi, futhi yenza 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 izindlela zokwakha ezifana nokuxubha, ukugoqa, ukugcwalisa, nokufutha kunezinzuzo zokonga umsebenzi, akulula ukuhlanzwa nokucwiliswa, kanye nokushaywa kancane. I-HEC inokuthuthukiswa kombala okuhle kakhulu. Inokuxubana okuhle kakhulu ngama-colorants amaningi nama-binder, okwenza kube nokwenzeka ukwenza opende be-latex abanombala omuhle kakhulu kanye nokuzinza. Ukuguquguquka okusetshenziswe ekwakhiweni, kuyi-ether engeyona i-ionic. Ngakho-ke, ingasetshenziswa kububanzi be-pH ebanzi (2~12), futhi ingaxutshwa nezingxenye zopende ojwayelekile we-latex njengezibala zombala ezisebenzayo, izithasiselo, usawoti omncibilikayo noma ama-electrolyte.
Awukho umthelela omubi kwifilimu yokugqoka. Ngenxa yokuthi isixazululo samanzi se-HEC sinezici ezisobala zokungezwani kwamanzi, akulula ukukhipha amagwebu ngesikhathi sokukhiqiza nokwakhiwa, futhi ukuthambekela kwezimbobo zentaba-mlilo namaphinifa kuncane.
Ukuzinza okuhle kwesitoreji. Enqubweni yokugcina isikhathi eside, ukuhlakazeka nokumiswa kwe-pigment kungagcinwa, futhi ayikho inkinga yombala ontantayo nokuqhakaza. Lapho kunongqimba oluncane lwamanzi endaweni kapende futhi 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-topcoat thickener kapende osuselwe emanzini nawo angasebenzisa i-HEC.
Njengamanje, ama-thickeners asetshenziswa opende bezinga eliphezulu be-latex basekhaya bangeniswa kwamanye amazwe ama-HEC nama-polymers e-acrylic (okuhlanganisa i-polyacrylates, i-homopolymer noma i-copolymer emulsion thickeners ye-acrylic acid ne-methacrylic acid) ukuqina.
I-Hydroxyethyl cellulose ingasetshenziselwa
1. Njengeglue elihlakazayo noma elivikelayo
Ngokuvamile, i-HEC ene-viscosity ye-10 kuya ku-30 mPaS isetshenziswa. I-HEC efinyelela ku-300mPa·S ingasetshenziswa ngokuhambisana nama-anionic noma ama-cationic surfactants, futhi umphumela wokuhlakazeka ungcono. Inani lereferensi ngokuvamile lingu-0.05% wesisindo se-monomer.
2, njenge-thickener
Sebenzisa i-15000mPa. Isilinganiso sereferensi se-high-viscosity HEC ngenhla s yi-0.5 kuya ku-1% yenani eliphelele le-latex coating, futhi inani le-PVC lingafinyelela cishe ku-60%. Kupende we-latex, kusetshenziswa i-HEC engaba ngu-20Pa,s futhi izici ezihlukahlukene zopende we-latex zihamba phambili. Izindleko zokusebenzisa i-HEC ngaphezu kuka-30O00Pa.s ziphansi. Kodwa-ke, izinga kanye nezinye izici zopende we-latex azilungile. Ngokombono wezidingo zekhwalithi kanye nokunciphisa izindleko, kungcono ukusebenzisa i-HEC ye-viscosity ephakathi nendawo nephezulu ndawonye.
3. Indlela yokuhlanganisa kupende we-latex
I-HEC egaywe phezulu ingezwa ngempushana eyomile noma ngendlela ewudaka. I-powder eyomile yengezwe ngokuqondile ekugayeni kwe-pigment. I-pH yendawo yokwengeza kufanele ibe ngu-7 noma ngaphansi. Izingxenye ze-alkaline ezifana nama-dispersants zinganezelwa ngemuva kwe-I-HECselimanzi te lihlakazeke ngokuphelele. I-slurry eyenziwe nge-HEC kufanele ihlanganiswe ne-slurry ngaphambi kokuba i-HEC ibe nesikhathi esanele sokukhipha amanzi futhi iqiniswe esimweni esingenakusebenziseka. I-HEC slurries ingabuye ilungiswe ngama-agent e-glycol-based coalescing.
4. I-Anti-mildew kapende we-latex
I-HEC encibilika emanzini iyawohloka lapho ichayeke esikhunjeni esiqondene ne-cellulose kanye nokuphuma kwayo. Ukwengeza ama-preservatives ukupenda kuphela akwanele, zonke izingxenye kufanele zingabi nama-enzyme. Izimoto ezikhiqiza upende we-latex kufanele zigcinwe zihlanzekile futhi zicocekile, futhi zonke izinto ezisetshenziswayo kufanele zihlale zifafazwa nge-steam 0.5% formalin noma i-0.1% ye-mercury solution.
Isikhathi sokuthumela: Apr-25-2024