Inqubo yokwenza i-coating

Inqubo yokuhlanganisa i-coalescence ingahlukaniswa ibe yi-coalescence yokuncibilika ukuze yakhe ifilimu yokuhlanganisa ebeka izigaba ezintathu.

Emazingeni okushisa anikeziwe, izinga lokulawula ukuhlangana okuncibilikisiwe okubaluleke kakhulu iphuzu lokuncibilika kwe-resin, i-viscosity yesimo esincibilikisiwe sezinhlayiya zempushana kanye nobukhulu bezinhlayiya zempushana. Ukuze best coalescence of okuncibilikisiwe kufanele ngokushesha ngangokunokwenzeka, ukuze kube nesikhathi eside ukuqedela leveling isigaba ukugeleza imiphumela. Ukusetshenziswa kwe-ejenti yokwelapha efinyeziwe etholakalayo ukuze kugeleze futhi kulinganiswe isikhathi esidingekayo, futhi ngaleyo ndlela ifilimu yokumboza eyakhiwe ngalezo mpushana esebenza ngokwedlulele ngokuvamile iveza ikhasi elolintshi.

Izici eziyinhloko ezithinta ukugeleza kwe-coating kanye nokulinganisa i-viscosity encibilikayo ye-resin, ukungezwani okungaphezulu kwesistimu nokuqina kwefilimu. Futhi, i-viscosity encibilikayo, ikakhulukazi incike ekushiseni okuphulukisayo, izinga lokuphulukisa kanye nezinga lokushisa.

Izici ezihlukahlukene ezishiwo ngenhla, kanye nokusatshalaliswa kosayizi wezinhlayiyana kanye nogqinsi lwefilimu, ngokuvamile kunqunywa izakhiwo zefilimu ezidingekayo okufanele zibe izinto ezipendiwe kanye nezimo zokwakha impushana ezinqunyiwe. I-Powder enamathela ukugeleza kanye nokulinganisa kwamandla avela ekushubeni kwendawo yohlelo, lokhu okungaphambili kuye kwashiwo futhi. Amandla asetshenziswe ekukhangeni phakathi kwama-molecule efilimu yokugqoka ngokuphambene nalokho, umphumela, njenge-viscosity encibilikayo iphezulu, kukhulu ukumelana nokugeleza nokulingana. Ngakho, ukushuba kwendawo, nosayizi wamangqamuzana womehluko phakathi kwamandla adonsela phansi kunquma izinga lokuleveli kwefilimu enamathelayo.

Ukuze kuhlanganiswe nokugeleza okuhle, kuyacaca ukuthi ukungezwani kwendawo yesistimu kufanele kube phezulu ngangokunokwenzeka, futhi i-viscosity encibilikayo iphansi ngangokunokwenzeka. Lokhu kungafinyelelwa ngokungeza izithasiselo ekucindezelekeni kwendawo yohlelo kungathuthukiswa futhi kusetshenziswe indawo encibilikayo ephansi ye-resin yesisindo esiphansi samangqamuzana.

Inqubo yokwenza i-coating

I-coatings ingalungiswa ngokuvumelana nezimo ezingenhla ezinezakhiwo ezinhle kakhulu zokugeleza, kodwa ngenxa yokungezwani kwayo okuphezulu kubangela ukushwabana, ngenxa ye-viscosity ephansi encibilikisayo kuzokhiqiza ukuwohloka, kanye namakhona Ukuqina kwe-coatability ephansi. Emsebenzini ongokoqobo, ukungezwani okungaphezulu kanye ne-viscosity encibilikayo yesistimu kulawulwa ngaphakathi kwebanga elithile, ngakho-ke ukubukeka okufanelekile kwendawo yokugqoka kungatholakala.

Umthelela we-tension surface kanye ne-viscosity encibilikayo yokugeleza kwefilimu yokumboza kukhonjiswe kuMfanekiso 2. Njengoba kungabonakala emfanekisweni, ukungezwani okungaphezulu kwe-viscosity encibilikayo ephansi kakhulu noma ephakeme kakhulu kuzovimbela ukugeleza kwe-coating, okuholela ekuthini ifilimu enamathelayo igeleza kahle, futhi ukushuba kwendawo kuphezulu kakhulu inqubo yokwenza ifilimu izovela ama-craters. Ukuzinza kwesitoreji esingokomzimba se-viscosity encibilikayo kuphansi kakhulu kuzokwenza ukuthi impushana yonakale Ukungahlangani kahle kokwakhiwa kwekhona, kanye nokwakhiwa kwefacade.

Kafushane, kusobala, isimo sokugcina sefilimu yokumboza impushana etholiwe, amaphutha kanye nokushoda (okufana nekhasi lewolintshi, ukugeleza okungahambi kahle, ama-craters, amaphinifa, njll.) kuhlobene eduze, futhi nasenqubweni yokubeka ebandakanyekayo ushintsho lwesigaba ekulawuleni amandla e-rheological. Ukusatshalaliswa kosayizi wezinhlayiyana zempushana nakho kuthinta ukubukeka kwendawo yefilimu yokumboza. Izinhlayiya ezincane, izinhlayiya ezinkulu eziphansi ngenxa yamandla ayo okushisa, ngakho-ke isikhathi saso sokuncibilika sifushane kunezinhlayiya ezinkulu, ama-coalescents nawo ashesha, futhi ukubukeka okungcono kwefilimu yokugqoka kwakhiwa. Impushana enkulu izinhlayiya isikhathi ukuncibilika kuka ubude izinhlayiya ezincane, ifilimu enamathela okwakhiwa on ingase elakhiwe umphumela orange ikhasi. Izindlela zokwakha impuphu ye-electrostatic (ukukhishwa kwe-corona noma ukukhishwa kwe-friction), kodwa futhi kuholela ekwakhekeni kwesici emakhasini awolintshi.

Indlela yokunciphisa noma yokugwema umphumela wekhasi lewolintshi ukukhuthaza ukugeleza nokulinganisa kunganciphisa noma kugweme ikhasi lewolintshi. Uhlelo lusebenzisa i-viscosity encibilikayo ephansi, ilinganisa isikhathi esengeziwe kanye nokushuba okuphezulu kwendawo enqubweni yokwelapha kungathuthukiswa ukugeleza nokulinganisa. Imingcele ebalulekile yokulawula i-gradient ye-top tension gradient iyancipha ikhasi lewolintshi, kuyilapho futhi ukulawula ukungezwani okungaphezulu kwendawo yefilimu enamathelayo kufana, ukuze kutholwe indawo encane kakhulu.

I-ejenti yokukhuthaza ukugeleza noma i-ejenti yokulinganisa ivame ukusetshenziswa emsebenzini wangempela ukuze kuthuthukiswe ukubukeka kwe-coating, ukuze kuqedwe ukukhubazeka okungaphezulu okufana nekhasi lewolintshi, ama-craters, ama-pinholes. Ukusebenza kahle kwe-ejenti ekhuthaza ukugeleza kunganciphisa i-viscosity yokuncibilika, ngaleyo ndlela kube nomthelela ekuxubeni kwe-ncibilika kanye nokuhlakazeka kwe-pigment, ukuthuthukisa ukumanzisa kwe-substrate, ukugeleza kanye nokulingana kwe-coating, kusiza ukuqeda ukukhubazeka kwendawo kanye. ukuze kube lula ukukhululwa komoya.

Umthamo wesilungisi esigelezayo kanye nobudlelwano bomphumela kufanele buphenywe. Inani elinganele lizodala ukuncipha kanye nekhasi lewolintshi, ukusetshenziswa ngokweqile kuzoholela ekulahlekelweni kwesicwebezelisi, inkungu, futhi kukhiqize izinkinga zokunamathela kabusha phezulu. Ngokuvamile, isilungisi sokugeleza ku-premix sengeziwe. Noma yenziwe nge-resin master batch (i-resin kanye ne-additive ratio engu-9/1 kuya ku-8/2), noma ikhangiswa kusithwali se-inorganic ngendlela yempushana. Inani lezithasiselo kupende oyimpushana lingu-0.5 kuya ku-1.5% (ku-Binders kubalwa i-polymer ephumelelayo), kodwa ekugxilweni okuphansi kungase kube kuhle.

Ama-resin e-polyacrylate flow modifier asetshenziswa kakhulu, njenge-polyacrylic acid butyl ester (“Acronal 4F”), i-acrylic acid ethyl – i-ethyl hexyl acrylate copolymer ne-butyl acrylate – i-acrylic acid-hexyl acrylate copolymer, njll. Angasetshenziswa ku-copolymer kakhulu kakhulu. ububanzi bokuhlushwa. Imvamisa i-polyacrylate inethonya elincane ekuqineni kwendawo, ingaba nomthelela ekweletini kwakha indawo efanayo efanayo. Uma kuqhathaniswa nalezo zezithasiselo ezinciphisa ukushuba kobuso (njenge-silicone noma okunye okunjalo), azikunciphisi ukushuba kwendawo, ngakho-ke zingasetshenziswa ukusheshisa ukulevelisa. Nciphisa ukushuba kwendawo kwezithasiselo kufaka phakathi ama-agent asebenzayo angaphezulu, i-alkyl esters ene-fluorinated, ne-silicone. Bajoyina inani elibucayi kakhulu. I-Benzoin iyi-ejenti ye-degassing, futhi inomphumela wokunciphisa ukungezwani kwendawo, isetshenziselwa kabanzi ukuthuthukisa ukubukeka kwendawo yefilimu yokugqoka ye-powder coating.

Inqubo yokwenza i-coating