Tetramethoxymethyl glycoluril (TMMGU), TGIC Replacement Chemistries
Tetramethoxymethyl glycoluril (TMMGU),
TGIC Replacement Chemistries
Hydroxyl polyester/TMMGU musanganiswa, senge powderlink 1174, yakagadzirwa neCytec, inogona kupa mukana wakanaka wekutsiva TGIC mumashandisirwo anoda kutetepa firimu kuvaka. Sezvo iyi chemistry yekurapa mashandiro ari kuita condensation, mamwe ematambudziko ekushandisa anotsanangurwa muchikamu cheHAA kurapa anoitikawo nekurapa uku. Nekudaro, ongororo ichangoburwa uye data inoratidza kuti pini gomba remahara machira anogona kuwanikwa ne hydroxyl polyester / TMMGU musanganiswa kunyangwe firimu rinovaka rinopfuura 4 mils.
Mhando iyi yemakemikari inoda yakasimba acid catalyst, yakadai semethyltolylsulfonimide (MTSI) kana cyclamic acid (CA). Acid catalysts ine zvimwe zvipingamupinyi: kuchengetwa kwenguva refu kwe acid-catalyzed electrostatic. powder coating inogona kushandura reactivity yeakadaro masisitimu. Uye mamwe maasidhi anokonzeresa anogona kukanganiswa, kana kunyange neutralized, neakakosha pigment kana mafirita, akadai secalcium carbonate, kunze kwekunge aya mainert akaiswa kare kana kuputirwa.
Iko kushandiswa kweasidhi catalysts kunogona kukonzera matambudziko ekugadzira hupfu maererano necatalyst dosage uye sarudzo yekuzadza. Precatalyzed (mukati catalyzed) marezeni ave kuwanikwa pakutengesa, achipa imwe nzira yekugadzira ne, uye kubata kwe, acid catalysts. Kunyanya kukanganisa kwe precatalyzed resins ndeyekuti havabvumiri vagadziri kuti vagadzirise kurapwa kweTMMGU masisitimu.
Yakavharwa uye isina kuvharika asidhi catalyts inoshanda neTMMGU type chemistries. Sezvo TMMGU masisitimu ane akavharika asidhi anofanirwa kuvhura kuti ashande, ivo vanoitaralinoda tembiricha yakakwira yekubheka kana nguva dzekubika dzakarebesa pane mafomula ane maasidhi asina kuvharika. Maasidhi akavharika ane kugadzikana kurinani kwekuchengetedza uye kushivirira kwepamusoro kwemavara ekutanga uye mafirita pane kuita maasidhi asina kuvharwa, zvisinei. Uyezve, basa richangoburwa neanonyellowing amine rakavharwa MTSI rakagadzira hupfu hunovaka kuhupamhi hwe4 kusvika ku5 mils (100 kusvika 125 microns) isina hurema hunooneka. Chakanakira maasidhi asina kuvharika ndechekuti vanopa tembiricha yekurapa iyo yakadzikira pane iya yeTGIC kana IPDI masisitimu.
MTSI inogadzira yakakwira-gloss finishes nepo CA ichigadzira zvigadzirwa zvine gloss renji pakati pepasi nepakati pasina kudiwa kwemaajenti ekufuratira. Mafirimu akafa-flat anogona kuwanikwa nekuwedzera mashoma eCA kune precatalyzed resin.
Chigadzirwa che condensation kubva kupolyester/TMMGU maitiro ndeye methanol, iyo inomutsa zvimwe zvinonetsa kwezvakatipoteredza, kunyanya kune vanoisa poda coatings. Kurapa mazinga asina kusimba emethanol akayerwa paanenge 1 kusvika 1.5 muzana yehuremu hwehuwandu hwekugadzira. TMMGU inoburitsawo 300 kusvika 600 ppm ye formaldehyde (papendi yakasimba) panguva yekurapa. Izvi, zvisineyi, zvakapetwa ka20 pasi pehuwandu hunogadzirwa nemelamine aminoplast mukurapa kwakajairika.
Parutivi rwakanaka, TMMGU system inopa zvakasiyana siyana zvezvigadzirwa zvingabvira kubva pakunyanya kuchinjika kusvika kune yakaoma kwazvo, isina kuvharika machira. Kuyerera, kuenzana, uye mamiriro ekunze zvimiro zvegenerally yakanaka kwazvo kune yakanakisa .QUV data kubva pahupfu hwakagadzirwa ne clear hydroxy polyester/TMMGU /MTSI masisitimu anoratidza kuti hupfu hwakadaro hunoramba hunopfuura 70 muzana yekupenya mushure me1000hours yekuratidzwa painogadzirwa isina UV absorbers. Kana yakagadzirwa neUV absorbers, hupfu hunochengetedza 85 kusvika 90 muzana yekupenya. Izvi zvinofananidzwa zvakanaka neTGIC uye IPDI masisitimu. MuFlorida exposure test, mamwe masisitimu eTMMGU akatsungirira mwedzi makumi maviri yemamiriro ekunze pasina kurasikirwa kunoonekwa kwekupenya.
Tetramethoxymethyl glycoluril (TMMGU)