Tetramethoxymethyl glycoluril (TMMGU), TGIC Replacement Chemistries

Tetramethoxymethyl glycoluril (TMMGU),

TGIC Replacement Chemistries

Hydroxyl polyester/TMMGU kuphatikiza, monga powderlink 1174, yopangidwa ndi Cytec, ikhoza kupereka mwayi wabwino kwambiri wosinthira TGIC muzofunsira zomwe zimafuna kupanga filimu yocheperako. Monga momwe machiritso a chemistry awa amachitira ndi condensation, mavuto ena ogwiritsira ntchito omwe akufotokozedwa mu gawo la HAA machiritso amapezekanso ndi mankhwalawa. Komabe, kuwunika kwaposachedwa ndi zidziwitso zikuwonetsa kuti zokutira zaulere za pini zitha kupezeka ndi kuphatikiza kwa hydroxyl polyester / TMMGU ngakhale kupanga filimu kupitilira 4 mils. 

Mankhwala amtunduwu amafunikira chothandizira champhamvu cha asidi, monga methyltolylsulfonimide (MTSI) kapena cyclamic acid (CA). Zothandizira acid zili ndi zovuta zina: kusungidwa kwanthawi yayitali kwa acid-catalyzed electrostatic. ufa wophimba akhoza kusintha reactivity ya machitidwe amenewa. Ndipo zothandizira zina za asidi zimatha kukhudzidwa, kapena ngakhale neutralized, ndi ma pigment oyambira kapena zodzaza, monga calcium carbonate, pokhapokha ngati zolowetsa izi zitayikidwa kale kapena zokutira.

Kugwiritsa ntchito zopangira asidi kungayambitse mavuto opangira ufa malinga ndi mlingo wa chothandizira komanso kusankha kwa zodzaza. Ma resins opangidwa kale (opangidwa mkati) ayamba kupezeka pamalonda, akupereka njira ina yopangira ndi, ndikusamalira, zopangira asidi. Choyipa chachikulu cha utomoni wosakhazikika ndikuti salola opanga kupanga kusintha machiritso a machitidwe a TMMGU. 

Ma catalyts otsekedwa ndi osatsekeka amagwira ntchito ndi ma chemistries amtundu wa TMMGU. Popeza machitidwe a TMMGU omwe ali ndi ma acid otsekedwa amayenera kutsegulidwa kuti ayambe kugwira ntchito, amapanga majiniralamafunikira kutentha kwakukulu kapena nthawi yophika yotalikirapo kuposa ma formula omwe ali ndi ma asidi osatsekeka. Ma asidi otsekedwa amakhala ndi kukhazikika kosungirako bwino komanso kulolerana kwambiri ndi ma pigment oyambira ndi zodzaza kuposa ma asidi osatsekeka. Kuphatikiza apo, ntchito yaposachedwa yokhala ndi nonyellowing amine yotsekedwa MTSI yatulutsa ufa womwe umakula mpaka makulidwe a 4 mpaka 5 mils (100 mpaka 125 ma microns) opanda zilema zowonekera. Ubwino wa ma asidi osatsekeka ndikuti amapereka kutentha kwa machiritso komwe kumakhala kotsika kwambiri kuposa kachitidwe ka TGIC kapena IPDI.

MTSI imapanga zomaliza zowala kwambiri pomwe CA imapanga zinthu zokhala ndi gloss pakati pa otsika ndi apakatikati popanda kufunikira kwa othandizira osalala. Mafilimu akufa atha kupezeka powonjezerapo pang'ono CA ku utomoni wokhazikika.

The condensation product from the polyester/TMMGU reaction is methanol , zomwe zimabweretsa nkhawa zina za chilengedwe, makamaka kwa opaka zokutira ufa. Machiritso osasunthika a methanol adayesedwa pafupifupi 1 mpaka 1.5 peresenti ya kulemera kwake konse. TMMGU imatulutsanso 300 mpaka 600 ppm ya formaldehyde (pazolimba za utoto) panthawi yochiritsa. Izi, komabe, ndizocheperapo ka 20 kuposa kuchuluka kwa mankhwala a melamine aminoplast mu zokutira wamba.

Kumbali yabwino, dongosolo la TMMGU limapereka mwayi wosiyanasiyana wa zinthu, kuyambira zosinthika kwambiri mpaka zolimba kwambiri, zokutira zosagwirizana. Kuyenda, kusanja, ndi kusinthasintha kwanyengo ndi jinirally zabwino kwambiri mpaka zabwino kwambiri .QUV data kuchokera ku ufa wopangidwa ndi clear hydroxy polyester/TMMGU /MTSI machitidwe amasonyeza kuti ufa woterewu umakhalabe oposa 70 peresenti ya gloss pambuyo pa 1000hours yowonekera pamene amapangidwa popanda UV absorbers. Akapangidwa ndi zotsekemera za UV, ufawo umasunga 85 mpaka 90 peresenti ya gloss. Izi zikufanizira bwino ndi machitidwe a TGIC ndi IPDI. Ku Florida kuyezetsa kuwonetseredwa, machitidwe ena a TMMGU apirira miyezi 20 ya nyengo popanda kutayika kowoneka bwino kwa gloss.

Tetramethoxymethyl glycoluril (TMMGU)