Tetramethoxymethyl glycoluril (TMMGU), TGIC Replacement Chemistries
Tetramethoxymethyl glycoluril (TMMGU),
TGIC Replacement Chemistries
Metsoako ea Hydroxyl polyester/TMMGU, e kang powderlink 1174, e entsoeng ke Cytec, e ka fana ka monyetla o babatsehang oa ho nka sebaka sa TGIC lits'ebetsong tse hlokang ho hahoa ha filimi e nyenyane. Kaha mokhoa ona oa phekolo ea k'hemistri ke karabelo ea condensation, mathata a mang a ts'ebeliso a hlalositsoeng karolong ea HAA a boetse a etsahala ka phekolo ena. Leha ho le joalo, litlhahlobo tsa morao-rao le lintlha li bonts'a hore likhoele tsa mahala tsa pin hole li ka fumanoa ka motsoako oa hydroxyl polyester / TMMGU leha filimi e hahuoa e feta 4 mils.
Mofuta ona oa k'hemistri o hloka motsoako o matla oa acid, joalo ka methyltolylsulfonimide (MTSI) kapa cyclamic acid (CA). Li-catalyst tsa asiti li na le mathata a itseng: ho boloka nako e telele ea acid-catalyzed electrostatic. ho apara ka phofo e ka fetola ts'ebetso ea litsamaiso tse joalo. 'Me li-catalyst tse ling tsa acid li ka ameha, kapa esita le neutralized, ka li-pigments tsa mantlha kapa li-fillers, joalo ka calcium carbonate, ntle le haeba li-inert tsena li entsoe esale pele kapa li koahetsoe.
Tšebeliso ea li-catalysts tsa acid e ka baka mathata a li-formalator tsa phofo ho latela litekanyetso tsa catalyst le khetho ea li-fillers. Li-resin tsa precatalyzed (ka hare ho catalyzed ) li se li fumaneha khoebong, li fana ka mokhoa o mong oa ho etsoa ka , le ho sebetsana le li-catalyst tsa asiti. Phoso e kholo ka ho fetisisa ea li-resin tse entsoeng esale pele ke hore ha li lumelle baetsi ba metsoako ho fetola pheko ea mekhoa ea TMMGU.
Li-catalyts tsa asiti tse koetsoeng le tse sa koaloang li sebetsa le lik'hemik'hale tsa mofuta oa TMMGU. Kaha lits'ebetso tsa TMMGU tse nang le li-acid tse koetsoeng li tlameha ho thijoa hore li sebetse, li a generalba hloka mocheso o phahameng oa ho baka kapa linako tse telele tsa ho baka ho feta liforomo tse nang le li-acid tse sa thijoang. Li-acid tse koetsoeng li na le botsitso bo betere ba polokelo le mamello e phahameng ea li-pigment le li-filler ho feta li-acid tse sa thijoang. Ho feta moo, mosebetsi oa morao-rao o nang le nonyellowing amine e thibetsoeng MTSI e hlahisitse phofo e hahang ho botenya ba 4 ho 5 mils (100 ho 125 microns) ntle le likoli tse bonahalang. Monyetla oa li-acid tse sa thijoang ke hore li fana ka lithempereichara tseo hangata li leng tlase ho feta tsa lits'ebetso tsa TGIC kapa IPDI.
MTSI e hlahisa li-finishing tse khanyang haholo athe CA e hlahisa lihlahisoa tse nang le mebala e khanyang pakeng tsa tlaase le bohareng ntle le tlhokahalo ea li-agent tse bataletseng. Lifilimi tse shoeleng li ka fumanoa ka ho eketsa chelete e nyenyane ea CA ho resin e entsoeng esale pele.
Sehlahisoa sa condensation se tsoang ho polyester/TMMGU reaction ke methanol, e hlahisang mathata a mang a tikoloho, haholo-holo bakeng sa lisebelisoa tsa ho roala phofo. Maemo a folisang a pheko bakeng sa methanol a lekantsoe hoo e ka bang liperesente tse 1 ho isa ho tse 1.5 tsa boima ba 'mele kaofela. TMMGU e boetse e lokolla 300 ho isa ho 600 ppm ea formaldehyde (ho matla a pente) nakong ea phekolo. Leha ho le joalo, sena se ka tlase ho makhetlo a 20 ho feta tekanyo eo melamine aminoplast e alafshoang ka eona ha e sebelisoa ka mokhoa o tloaelehileng.
Ka lehlakoreng le letle, sistimi ea TMMGU e fana ka mefuta e mengata e fapaneng ea menyetla ea lihlahisoa ho tloha ho tse tenyetsehang ho isa ho tse thata haholo, tse se nang litlolo. Phallo, boemo le maemo a leholimo ke liphatsa tsa lefutsorally e ntle haholo ho e babatsehang .QV data ho tloha ho phofo e entsoeng ka mokhoa o hlakileng oa hydroxy polyester / TMMGU /MTSI mekhoa e bontšang hore phofo e joalo e boloka ho feta karolo ea 70 lekholong ea khanya ka mor'a 1000hours ea ho pepeseha ha e etsoa ntle le lisebelisoa tsa UV. Ha li entsoe ka li-absorbers tsa UV, phofo e boloka karolo ea 85 ho isa ho 90 lekholong ea khanya. Sena se bapisoa hantle le lits'ebetso tsa TGIC le IPDI. Tekong ea ho pepeseha ha Florida, litsamaiso tse ling tsa TMMGU li 'nile tsa mamella likhoeli tse 20 tsa boemo ba leholimo ntle le tahlehelo e hlokomelehang ea gloss.
Tetramethoxymethyl glycoluril (TMMGU)