I-water-based (VOC & HAPs) i-coating yamahhala ingalungiswa kusuka ku-liquid aliphatic epoxy kanye ne-polymerized capropone polyols emincane futhi ingasetshenziswa ngemishini evamile futhi inamandla okushintsha i-powder coatings.Yiziphi amaphuzu okunakwa ekulungiseleleni amanzi i-aliphatic epoxy liquid coatings?Isazi senhlangano ye-Chinese epoxy resin industry wenze isingeniso esikhethekile ezinsukwini ezimbalwa ezedlule.
Ukutshalwa kwezimali kwemishini eyisisekelo okudingekayo kumugqa omusha wokumboza impushana kungagwenywa ngokusebenzisa imishini yokufafaza ye-liquid yendabuko.Lezi zembatho zingashintshwa ngokuzihlanza ngamanzi noma ngokujiya izimbotshana ezisekelwe emanzini ezixutshwe ne-cellulose thickeners.Nge-diglycidyl ether evamile ye-bisphenol A (bpa) resin, i-alicyclic epoxy inezici ezimbalwa ezilandelayo: umehluko phakathi kuka-A njengeketango eliyinhloko. i-aliphatic, ukusabela nge-asidi ngokushesha, kodwa ngama-amine/amides epoxy elapha ama-epoxy asetshenziswa ngokuvamile awasabeli, awaqukethe i-chlorine, i-viscosity engu-350 centipoise kanye ne-diglycidyl ether ye-bisphenol A (bpa) resin njenge-11000 centipoise, ngesikhathi esifanayo. futhi inokumelana nesimo sezulu esihle kakhulu.Ukusetshenziswa kwe-viscosity aliphatic epoxy ephansi kuma-cationic UV enamathela kuye kwanda kakhulu.Kube nemibiko eminingi mayelana nokulungiswa kanye nezakhiwo zalolu hlobo lwe-100% yezingubo eziqinile ngaphandle kwe-“VA”, kodwa kunezincwadi ezimbalwa ezinemininingwane mayelana nokusetshenziswa kwazo emakhazeni okwelapha ashisayo. isetshenziselwe ukuphulukisa uhlelo olushisayo, kodwa lezi ezimbili nazo zihlukile njenge-UV enamathela ngokuvamile ayifafazi ukwakhiwa, ngaleyo ndlela i-viscosity yokwakha iphakeme kunokufafaza i-thermal coating coating, emanzini okubhaka ohlobo lwe-cationic angasetshenziswa njenge-VOC diluent.
I-Cepolactone polyols isetshenziswe njengezihlambululi ezisebenzayo zezingubo ezisekelwe ku-solvent futhi ingasheshisa ukuphulukiswa kwezingubo ze-cationic UV.Amaqembu e-hydroxyl alawa ma-polyols ekugqokeni kwe-cationic UV awakwazi nje ukusheshisa ukuphulukiswa, kodwa futhi aholele ekuzweleni okuthile okuphulukisa umswakama. ama-polyols akhulisa ukubekezelelana kwamanzi, ukuze amanzi angasetshenziswa njenge-VOC-free thinner ekwakhiweni kopende okwakhiwa ama-aliphatic epoxies kanye nama-polyols, empeleni okuyizingubo eziqinile eziphakeme ezihlanjululwe ngamanzi.Ukuhlanjululwa kwamanzi kunezinzuzo ezimbili: i-viscosity ephansi ukungabi khona kwe-VOC, kanye nokusetshenziswa kwezinyathelo zopende ezivamile neziyaziwa kakhulu ezisekelwe emanzini ukuze kuvinjelwe ukulengiswa nokulawulwa kwe-rheological.Njengoba ingxenye ngayinye kufomula ixubene kancane namanzi, inani lamanzi elingamuncwa lilinganiselwe.Kufanele kuqashelwe ukugwema ukufaka amanzi amaningi ukuze kubangele ukuhlukana kwesigaba.
Ama-cellulosic thickeners asebenza kahle ekuhlanganiseni okusekelwe emanzini, kodwa akucaci ukuthi ayasebenza yini ku-100% okuqinile, okuhlanjululwe ngamanzi kwe-aliphatic epoxy coatings.Umsebenzi wangaphambili wabonisa ukuthi ama-epoxide aqinile angu-100% ahlanjululwe ngamanzi ayeyi-thixotropic uma elinganiswa ne-viscometer ye-Brookfield. .Uphenyo lwama-thickeners ahlukahlukene lubonisa ukuthi izingqimba ze-cellulose zinezakhiwo ezibanzi kakhulu.Uma kushisa kufika ku-40 ~ 60℃, ukubukeka okuhle kwefilimu kungatholakala ngokusebenzisa isibhamu sokufutha.Izinga lokushisa eliphansi lokwakha lenza ifilimu eselashiwe ikhiqize ikhasi eliwolintshi kakhulu.Ochwepheshe benhlangano yaseChina epoxy resin industry bathi inzuzo enkulu yokugcotshwa kwempushana ihlanganiswe ngokusebenza kahle kakhulu, ukusebenza kahle okuphezulu ikakhulukazi ngokutholwa kwempushana ukuze kuzuzwe, kuya ku-powder enamathela okulingana lolu hlobo lokumboza okuwuketshezi ludinga indlela ethile yokubuyisela upende oyimpukane.Njengoba ukwakheka kukapende okuchazwe lapha akuqukethe izincibilikisi zemvelo ukuze kutholakale kalula, amanzi alahlekile ohlelweni lokubuyisela angalungiswa kalula ngokulinganisa ukuqhutshwa kukagesi uma kunesidingo, ukonga amandla ngogesi. edinga amazinga okushisa aphansi okubhaka uma kuqhathaniswa namazinga okushisa okubhaka aphakeme kakhulu adingekayo ukuze kufakwe impushana.Enye inketho ehlolwayo ukufafaza ama-anhydrous epoxies, polyols, nama-pigments ngendlela ye-“Unicarb”, esebenza kahle kakhulu kune-powder coating.Uma kungekho i-VOC yamahhala edingekayo, mane ungeze izincibilikisi kufomula.
Mayelana nefomula inothi, ochwepheshe benhlangano ye-epoxy resin industry yase-China bathi, ukuphulukisa i-cationic ngoba i-alkali izoyeka ukuphulukisa, ngakho-ke zonke izithasiselo kanye nama-rheological control agents akumele aqukathe i-alkaline, i-alkaline pigments kanye ne-amines ephathwayo yombala izovimbela ukuphulukiswa. futhi ivimbela ukuphulukiswa kwe-cationic, izingulube ze-alkaline kanye nezithasiselo ezingxenyeni ze-cationic zokuphulukisa azikwazi ukusetshenziswa, ukuphulukiswa kuncike ku-catalyst FC-520 ngenani elincane le-amine sealant volatilization, uma ifilimu ishubile kakhulu noma ihhavini lingangeni umoya, i-amine ayikwazi ukususwa ngokuphelele ifilimu futhi zivimbele ukuphulukiswa.Viscosity anda ngokwanda polyols branched degree ukwanda: utshwala dibasic kunemali engenayo yuan ezintathu noma ezine viscosity ephansi kapende, utshwala kanye glycol ukwabelana isidingo ukwandisa inani epoxy value ( R) ingatholwa ngokufakwa okuqinile, umthamo omkhulu we-epoxy corrosion ungathuthukiswa, ukwanda komthamo we-catalyst kungasheshisa isivinini sokuphulukisa kodwa futhi kunganciphisa ukugqwala, isilinganiso se-molar ye-epoxy ne-hydroxyl R sinethonya elikhulu esivinini sokuphulukisa. .
Noma kunjalo, i-alicyclic epoxy ene-caprolactone polyols i-viscosity ephansi futhi ayikho i-VOC coating, i-coating ingahlanjululwa ngamanzi ukuze ifafaze i-viscosity, i-cellulose thickener inganikeza amanzi ahlanjululwe nge-epoxy eqinile engu-100% kanye ne-polyols enamathela ukuvimbela ngempumelelo ukugoqa, uhlelo lokuphulukisa isivinini. kunqunywa ngokuguquguqukayo okulandelayo: isilinganiso se-molar ye-epoxy ne-hydroxyl, utshwala obuhlukahlukene kanye nokusebenza kwe-epoxy, umthamo we-catalyst kanye nezinga lokushisa lokuphulukisa, ifomula ingasetshenziswa kalula ekulungiseni upende, ngoba lolu hlobo lokugqoka lwe-cationic ukuphulukisa upende oyisisekelo kanye ne-substrate kungavimbela ukuphulukiswa.
Isikhathi sokuthumela: Apr-06-2021