Tetramethoxymethyl glycoluril (TMMGU), TGIC Hloov Chemistry
Tetramethoxymethyl glycoluril (TMMGU),
TGIC Replacement Chemistry
Hydroxyl polyester / TMMGU kev sib txuas, xws li powderlink 1174, tsim los ntawm Cytec, tuaj yeem muab lub sijhawm zoo los hloov TGIC hauv cov ntawv thov uas yuav tsum tau ua cov yeeb yaj kiab thinner. Raws li qhov kev kho mob chemistry no yog cov tshuaj tiv thaiv condensation, qee qhov teeb meem ntawm daim ntawv thov tau piav qhia hauv ntu ntawm HAA curatives kuj tshwm sim nrog qhov kev kho mob no. Txawm li cas los xij, kev ntsuam xyuas thiab cov ntaub ntawv tsis ntev los no qhia tau hais tias tus pin qhov dawb txheej tuaj yeem tau txais nrog hydroxyl polyester / TMMGU ob peb ua ke txawm tias thaum zaj duab xis tsim ntau tshaj 4 mils.
Hom chemistry no xav tau cov kua qaub uas muaj zog, xws li methyltolylsulfonimide (MTSI) lossis cyclamic acid (CA). Acid catalysts muaj qee qhov tsis zoo: kev cia ntev ntawm cov kua qaub-catalyzed electrostatic hmoov txheej tuaj yeem hloov cov reactivity ntawm cov tshuab no. Thiab qee cov kua qaub catalysts tuaj yeem cuam tshuam, lossis txawm tias nruab nrabralized, los ntawm cov pigments yooj yim los yog muab tso rau, xws li calcium carbonate, tshwj tsis yog cov inerts no pretreated los yog coated .
Kev siv cov kua qaub catalysts tuaj yeem ua rau muaj teeb meem ntawm cov hmoov formulators raws li kev siv tshuaj catalyst thiab kev xaiv cov fillers. Precatalyzed (internally catalyzed) resins tau dhau los ua lag luam, muab lwm txoj hauv kev rau kev tsim nrog , thiab tuav cov kua qaub catalysts. Qhov loj tshaj qhov tsis zoo ntawm precatalyzed resins yog tias lawv tsis tso cai rau cov neeg tsim qauv los hloov kho cov txheej txheem TMMGU.
Thaiv thiab tsis thaiv cov kua qaub catalyts ua haujlwm nrog TMMGU hom chemistry. Txij li thaum TMMGU cov tshuab uas muaj cov kua qaub thaiv yuav tsum tsis txhob thaiv kom ua haujlwm, lawv cov noobrally xav tau siab dua ci los yog lub sij hawm ci ntev dua li cov qauv uas muaj cov kua qaub tsis thaiv. Blocked acids muaj kev ruaj ntseg cia zoo dua thiab ua siab ntev rau cov xim yooj yim thiab cov fillers dua li cov kua qaub tsis thaiv, txawm li cas los xij. Ntxiv mus, tsis ntev los no ua hauj lwm nrog nonyellowing amine blocked MTSI tau tsim cov hmoov uas ua rau ib tug tuab ntawm 4 mus rau 5 mils (100 mus rau 125 microns) yam tsis muaj kev kuaj pom. Qhov kom zoo dua ntawm cov kua qaub tsis thaiv yog tias lawv muab kev kho qhov kub thiab txias uas feem ntau qis dua cov rau TGIC lossis IPDI systems.
MTSI ua kom tiav high-gloss whereas CA tsim cov khoom nrog gloss ranges ntawm qis thiab nruab nrab yam tsis tas yuav tsum tau rau flatting agents. Tuag-flat films tuaj yeem tau txais los ntawm kev ntxiv me me ntawm CA rau cov khoom siv precatalyzed.
Cov khoom condensation los ntawm polyester / TMMGU cov tshuaj tiv thaiv yog methanol, uas ua rau qee qhov kev txhawj xeeb ntawm ib puag ncig, tshwj xeeb tshaj yog rau cov hmoov coatings applicators. Kho cov qib volatile rau methanol tau ntsuas li ntawm 1 txog 1.5 feem pua ntawm tag nrho cov qauv hnyav. TMMGU kuj tso tawm 300 txog 600 ppm ntawm formaldehyde (ntawm cov xim pleev xim) thaum kho. Qhov no, txawm li cas los xij, yog kwv yees li 20 npaug tsawg dua li tus nqi melamine aminoplast curative tsim nyob rau hauv cov pa txheej.
Ntawm qhov zoo, TMMGU qhov system muaj ntau yam khoom muaj peev xwm xws li hloov tau yooj yim mus rau qhov nyuaj heev, tsis muaj xim daj. Flow, leveling, thiab weathering zog yog cov noobrally zoo heev rau yav tom ntej .QUV cov ntaub ntawv los ntawm cov hmoov formulated nrog ntshiab hydroxy polyester / TMMGU / MTSI systems qhia tias cov hmoov zoo li no khaws ntau tshaj 70 feem pua ntawm gloss tom qab 1000hours ntawm raug thaum lawv yog formulated tsis muaj UV absorbers. Thaum tsim nrog UV absorbers, cov hmoov khaws cia 85 mus rau 90 feem pua ntawm gloss. Qhov no piv tau zoo nrog TGIC thiab IPDI systems. Hauv Florida kev kuaj pom, qee lub tshuab TMMGU tau tiv taus 20 lub hlis ntawm huab cua yam tsis muaj qhov pom pom ntawm qhov ci.
Tetramethoxymethyl glycoluril (TMMGU)