TGIC hloov chemistry hauv hmoov txheej-Hydroxyalkylamide (HAA)
Hydroxyalkylamide (HAA) TGIC Replacement chemistry
Raws li lub neej yav tom ntej ntawm TGIC tsis paub meej, cov neeg tsim khoom tab tom nrhiav kev hloov pauv rau nws. HAA curatives xws li Primid XL-552, tsim thiab ua lag luam los ntawm Rohm thiab Haas, tau qhia. Lub ntsiab drawback rau xws hardeners yog hais tias, txij li thaum lawv kho mechanism yog ib tug condensation cov tshuaj tiv thaiv, cov yeeb yaj duab uas tsim rau thicknesses tshaj 2 mus rau 2.5 mils (50 mus rau 63 microns) yuav tso tawm outgassing, pinholing, thiab tsis txaus txaus thiab theem. Qhov no yog qhov tseeb tshwj xeeb tshaj yog thaum cov curatives siv nrog cov pa carboxy polyesters tsim rau TGIC ob peb ua ke.
Cov tiam tshiab ntawm carboxy polyesters, tsim los yog tsim los ntawm EMS, Hoechst Celanese, thiab Ruco, siv nrog Primid XL-552, txo cov teeb meem no feem ntau, txawm li cas los xij.Data nyuam qhuav tsim los ntawm Hoechst Celanese, piv txwv li, qhia tias Primid's weatherability yog txhim kho los ntawm kev siv tsawg dua stoichiometric nqi ntawm hardener. Cov txiaj ntsig zoo ib yam tuaj yeem ua tiav los ntawm kev ntxiv me me ntawm cov blocked isophorone diisocyanate (IPDI) mus rau tag nrho stoichiometric Primid system, uas muaj txiaj ntsig zoo.ralizes ib co HAA. Tsis tas li ntawd, cov ntaub ntawv sib sau ua ke tom qab nthuav tawm cov cim tshiab ntawm carboxy polyester / HAA thiab cov tsoos thiab qib siab carboxyl polyester TGIC system rau Florida tshav ntuj rau 2 xyoo qhia tias cov chemistry no huab cua piv. Thiab qhov kev sim Florida uas peb tau ua qhia tau hais tias muaj ntau yam xim Primid systems pom tsawg-ntawm-gloss fluctuations uas cov pa TGIC systems uas zoo li pigmentation thiab muab tub lim cov ntsiab lus.
Qee cov tshuaj surfactant-hom additives tuaj yeem tso cai rau cov yeeb yaj kiab tsim kom txog li 3 mils (75 microns) yam tsis muaj kev nthuav tawm lossis lwm yam teeb meem loj. Diphenoxy compounds tau ua ke nrog benzoin hauv carboxy polyester HAA chemistry kom zoo dua cov yeeb yaj kiab zoo thiab txo qis daj.
Qee lub cim tshiab carboxy polyester / HAA cov tshuab muaj peev xwm ua tiav lossis kho kom txaus ntawm qhov kub thiab txias li 138C rau 20 feeb, ntev npaum li qhov sib piv tag nrho ntawm stoichiometric resin rau hardener siv. Cov hmoov tsim los ntawm cov tshuab no muaj peev xwm ua txheej rau cov khoom siv tsis yog xim hlau.
Hydroxyalkylamide (HAA)