I-Tetramethoxymethyl glycoluril (TMMGU), i-TGIC Replacement Chemistries
I-Tetramethoxymethyl glycoluril (TMMGU),
I-TGIC Replacement Chemistries
Inhlanganisela ye-Hydroxyl polyester/TMMGU, njenge-powderlink 1174, eyakhiwe yi-Cytec, ingase inikeze ithuba elihle kakhulu lokushintsha i-TGIC ezinhlelweni ezidinga ukwakhiwa kwefilimu encane. Njengoba le ndlela yokwelapha yamakhemikhali iwukusabela kokujiya, ezinye zezinkinga zohlelo lokusebenza ezichazwe esigabeni sokuphulukisa kwe-HAA nazo zenzeka nalokhu kwelashwa. Kodwa-ke, ukuhlaziya kwakamuva kanye nedatha kukhombisa ukuthi i-pin hole coating yamahhala ingatholwa ngenhlanganisela ye-hydroxyl polyester / TMMGU noma ngabe ukwakhiwa kwefilimu kudlula ama-mils angu-4.
Lolu hlobo lwamakhemikhali ludinga i-acid catalyst eqinile, njenge-methyltolylsulfonimide (MTSI) noma i-cyclamic acid (CA). Ama-Acid catalyst anezihibe ezithile: ukugcinwa kwesikhathi eside kwe-acid-catalyzed electrostatic i-powder coating ingashintsha ukusebenza kabusha kwamasistimu anjalo. Futhi amanye ama-acid catalysts angathinteka, noma ngisho ne-neutraleyenziwe ngemibala eyisisekelo noma izigcwalisi, njenge-calcium carbonate, ngaphandle kwalapho lezi zingezi zifakwe ngaphambili noma zimboziwe.
Ukusetshenziswa kwama-catalysts e-asidi kungase kubangele izinkinga ze-powder formulators ngokwemithamo ye-catalyst kanye nokukhetha kokugcwalisa. Ama-resin ase-precatalyzed (angaphakathi ngaphakathi ) aseyatholakala ukuze athengiselwe , anikeza enye indlela yokwakheka , kanye nokuphatha ,izisusa ze-asidi. Okubi kakhulu kwama-resins angaphambi kwe-precatalyzed ukuthi awavumeli abahlanganisi ukuthi balungise ukwelashwa kwezinhlelo ze-TMMGU.
Ama-catalyts e-asidi avinjiwe futhi angavinjiwe asebenza nohlobo lwamakhemikhali e-TMMGU. Njengoba amasistimu e-TMMGU aqukethe ama-asidi avinjiwe kufanele avuleke ukuze asebenze, akhiqiza ufuzoralzidinga amazinga okushisa aphezulu okubhaka noma izikhathi ezinde zokubhaka kunamafomula anama-asidi angavinjiwe. Ama-asidi avinjiwe anokusimama okungcono kwesitoreji kanye nokubekezelela okuphezulu kombala oyisisekelo nezigcwalisi kunama-asidi angavinjiwe. Ngaphezu kwalokho, umsebenzi wakamuva one-nonyellowing amine evinjiwe i-MTSI ukhiqize impushana eyakha ukujiya okungu-4 kuya ku-5 mils (ama-microns angu-100 kuya kwangu-125) ngaphandle kokulimala okubonakalayo. Inzuzo yama-asidi angavinjiwe ukuthi anikeza amazinga okushisa okwelapha ngokuvamile aphansi kunalawo ezinhlelo ze-TGIC noma ze-IPDI.
I-MTSI ikhiqiza okucwebezelayo okuphezulu kuyilapho i-CA ikhiqiza imikhiqizo enobubanzi obucwebezelayo obuphakathi kokuphansi nokumaphakathi ngaphandle kwesidingo sama-ejenti aphansi. Amafilimu ama-Dead-flat angatholakala ngokungeza amanani amancane e-CA kunhlaka engakafakwa.
Umkhiqizo wokujiya ovela ku-polyester/TMMGU yokusabela i-methanol, ephakamisa ukukhathazeka okuthile kwemvelo, ikakhulukazi kwabafake izicelo zokumboza ngempuphu. Amazinga okwelapha okuguquguqukayo e-methanol akalwe cishe kumaphesenti angu-1 kuya ku-1.5 yenani lesisindo sokwakheka. I-TMMGU iphinde ikhiphe u-300 kuya ku-600 ppm we-formaldehyde (kuzinto eziqinile zikapende) ngesikhathi sokwelashwa. Lokhu, nokho, kungaphansi ngokuphindwe izikhathi ezingu-20 kunenani lokwelapha i-melamine aminoplast elikhiqizwa ekunambeni okuvamile.
Ngasohlangothini oluhle, uhlelo lwe-TMMGU lunikeza amathuba emikhiqizo enhlobonhlobo kusukela kokuvumelana nezimo kakhulu kuye kweziqinile kakhulu, kunezimbotshana ezingenakugwenywa. Ukugeleza, ukulinganisa, kanye nezakhiwo zezulu ziyizakhi zofuzoralkuhle kakhulu kuya kokuhle kakhulu .Idatha ye-QUV evela kuzimpushana ezenziwe ngezinhlelo ezicacile ze-hydroxy polyester/TMMGU/MTSI zibonisa ukuthi izimpushana ezinjalo zigcina okucwebezelayo okungaphezu kwamaphesenti angu-70 ngemva kwamahora angu-1000 okuchayeka lapho enziwa ngaphandle kwezimuphi ze-UV. Uma kwenziwa ngezimunyisi ze-UV, izimpushana zigcina amaphesenti angama-85 kuya kwangu-90 okucwebezela. Lokhu kuqhathaniswa kahle nezinhlelo ze-TGIC kanye ne-IPDI. E-Florida ukuhlolwa kokuchayeka, ezinye izinhlelo ze-TMMGU zimelane nezinyanga ezingu-20 zesimo sezulu ngaphandle kokulahlekelwa okubonakalayo kokucwebezela.
I-Tetramethoxymethyl glycoluril (TMMGU)