Tetramethoxymethyl glycoluril (TMMGU), Chemistries nnọchi TGIC

Tetramethoxymethyl glycoluril (TMMGU),

Chemistries nnọchi TGIC

Ngwakọta Hydroxyl polyester / TMMGU, dị ka powderlink 1174, nke Cytec mepụtara, nwere ike inye ohere magburu onwe ya iji dochie TGIC na ngwa ndị na-achọ ihe nkiri dị nro. Dị ka usoro ọgwụgwọ kemịkalụ a bụ mmeghachi omume condensation, ụfọdụ nsogbu ngwa a kọwara na ngalaba nke HAA curatives na-emekwa na nke a. Agbanyeghị, nyocha na data n'oge na-adịbeghị anya na-egosi na enwere ike nweta mkpuchi n'efu na nchikota hydroxyl polyester / TMMGU ọbụlagodi mgbe ihe nkiri na-ewuli karịa 4 mils. 

Ụdị kemistri a chọrọ onye na-eme ka acid siri ike, dị ka methyltolylsulfonimide (MTSI) ma ọ bụ cyclamic acid (CA). Acid catalysts nwere ụfọdụ ndọghachi azụ: nchekwa ogologo oge nke acid-catalyzed electrostatic ntụ ntụ nwere ike ịgbanwe reactivity nke ndị dị otú ahụ usoro. Na ụfọdụ acid catalysts nwere ike imetụta , ma ọ bụ ọbụna neutralized, site na isi pigmenti ma ọ bụ ihe ndochi, dị ka calcium carbonate , ma ọ bụrụ na ndị a inerts bụ pretreated ma ọ bụ mkpuchi .

Ojiji nke acid catalysts nwere ike ịkpata nsogbu ndị na-emepụta ntụ ntụ n'ihe gbasara usoro onunu ogwu na nhọrọ nke ndochi. Resins precatalyzed (ime catalyzed) aghọọla ahịa, na-enye ụzọ ọzọ iji mepụta, na ijikwa ihe na-akpata acid. Ihe kacha njọ nke resin precatalyzed bụ na ha anaghị ekwe ka ndị na-emepụta ihe gbanwee ọgwụgwọ nke usoro TMMGU. 

Acid egbochiri na nke akpọchiri akpọchi na-arụ ọrụ na ụdị kemịkalụ TMMGU. Ebe usoro TMMGU nke nwere acid egbochiri aghaghị imeghe ka ọ rụọ ọrụ, ha bụ mkpụrụ ndụ ihe nketarally chọrọ okpomọkụ dị elu nke bred ma ọ bụ ogologo oge achịcha karịa usoro nwere acid anaghị egbochi. Acid egbochiri nwere nkwụsi ike nchekwa ka mma yana nnabata dị elu maka pigmenti ndị bụ isi na ihe nju karịa ka acid anaghị egbochi, agbanyeghị. Ọzọkwa, ọrụ na nso nso a na nonyellowing amine blocked MTSI ewepụtala ntụ ntụ na-ewuli na ọkpụrụkpụ nke 4 ruo 5 mils (100 ruo 125 microns) na-enweghị ntụpọ enwere ike ịchọpụta. Uru nke acids anaghị egbochi bụ na ha na-enye okpomọkụ ọgwụgwọ nke na-adịkarị ala karịa nke maka sistemụ TGIC ma ọ bụ IPDI.

MTSI na-arụpụta ihe dị elu na-egbuke egbuke ebe CA na-emepụta ngwaahịa nwere oke gloss n'etiti obere na etiti na-enweghị mkpa maka ndị na-emepụta ihe. Enwere ike nweta ihe nkiri ndị nwụrụ anwụ site n'ịgbakwunye obere CA na resin precatalyzed.

Ngwaahịa condensation sitere na mmeghachi omume polyester / TMMGU bụ methanol, nke na-ebute ụfọdụ nchegbu gburugburu ebe obibi, karịsịa maka ndị na-etinye ihe mkpuchi ntụ ntụ. Atụrụla ọkwa ọgwụgwọ na-agbanwe agbanwe maka methanol n'ihe dịka pasenti 1 ruo 1.5 nke mkpokọta nha nhazi. TMMGU na-ewepụtakwa 300 ruo 600 ppm nke formaldehyde (na agba agba) n'oge ọgwụgwọ. Otú ọ dị, nke a dị ihe dị ka okpukpu 20 na-erughị ego nke melamine aminoplast curative na-emepụta na mkpuchi a na-emekarị.

N'akụkụ dị mma, sistemụ TMMGU na-enye ohere dị iche iche nke ngwaahịa sitere na oke mgbanwe ruo na mkpuchi siri ike, enweghị onye ọ bụla. Ngwongwo, nhazi ọkwa, na njirimara ihu igwe bụ mkpụrụ ndụ ihe nketarally ezigbo mma magburu onwe .QUV data si powders chepụtara na doro anya hydroxy polyester / TMMGU / MTSI usoro na-egosi na ndị dị otú ahụ powders na-ejigide ihe karịrị 70 percent nke gloss mgbe 1000hours nke ikpughe mgbe ha na-emepụta na-enweghị UV absorbers. Mgbe etinyere ya na ihe ndị na-ekpo ọkụ UV, ntụ ntụ na-ejigide pasent 85 ruo 90 nke gloss. Nke a na-atụnyere nke ọma na sistemụ TGIC na IPDI. Na Florida ikpughe ule , ụfọdụ TMMGU usoro eguzogidewo 20 ọnwa nke weathering na-enweghị ihe ọ bụla pụtara ìhè ọnwụ nke gloss.

Tetramethoxymethyl glycoluril (TMMGU)