I-TGIC esikhundleni samakhemikhali ku-powder coating-Hydroxyalkylamide(HAA)
I-Hydroxyalkylamide(HAA) TGIC Replacement chemistries
Njengoba ikusasa le-TGIC lingaqinisekile, abakhiqizi bafuna enye indawo efanayo. Imithi yokwelapha ye-HAA efana ne-Primid XL-552, ethuthukiswe futhi ephawulwe yi-Rohm kanye ne-Haas, yethuliwe. Umphumela oyinhloko kulokho okuqinile ukuthi, njengoba indlela yokwelapha iwukusabela kokujiya, amafilimu akha ugqinsi oludlula amamitha angu-2 ukuya kwangu-2.5 (ama-microns angama-50 kuye kwangama-63) angase abonise ukukhipha umoya, ukuphina, nokugeleza nokungalinganisi kahle. Lokhu kuyiqiniso ikakhulukazi uma lezi zindlela zokwelashwa zisetshenziswa nama-polyester ajwayelekile e-carboxy akhelwe izinhlanganisela ze-TGIC.
Izizukulwane ezintsha zama-carboxy polyester, athuthukiswa noma athuthukiswa yi-EMS,Hoechst Celanese, kanye no-Ruco, ukuze asetshenziswe ne-Primid XL-552, adambisa iningi lalezi zinkinga, nokho.Idatha esanda kusungulwa ngu-Hoechst Celanese, ngokwesibonelo, ikhombisa ukuthi isimo sezulu sikaPrimid ithuthukiswa ngokusebenzisa amanani angaphansi kwe-stoichiometric of harder. Imiphumela efanayo ingafinyelelwa ngokungeza inani elincane le-isophorone diisocyanate (IPDI) evinjiwe ohlelweni lwe-Primid oluphelele lwe-stoichiometric, olungasebenzi kahle.ralyenza ezinye ze-HAA. Ngaphezu kwalokho , idatha eqoqwe ngemva kokuveza isizukulwane esisha se-carboxy polyester/HAA kanye nesistimu ye-carboxyl polyester TGIC yendabuko nethuthukisiwe e-Florida ukukhanya kwelanga iminyaka engu-2 ibonisa ukuthi lezi zindawo zamakhemikhali zinesimo sezulu esifanayo. Futhi ukuhlolwa kwaseFlorida esikwenzile kukhombisa ukuthi izinhlobonhlobo zamasistimu e-Primid anemibala abonisa ukulahleka okuncane kokushintshashintsha kwe-gloss kumasistimu avamile we-TGIC anombala ofanayo nokuqukethwe kokugcwalisa.
Ezinye izithasiselo zohlobo lwe-surfactant zingavumela amafilimu ukuthi akhe kufika ku-3 mils (75 microns) ngaphandle kokukhombisa ukuphuma komoya noma ezinye izinkinga ezinkulu zendawo. Izinhlanganisela ze-diphenoxy zihlanganiswa ne-benzoin kumakhemikhali e-carboxy polyester HAA ukuze kubonakale ifilimu engcono kakhulu nokuncipha kokuphuzi.
Amanye amasistimu esizukulwane esisha se-carboxy polyester / HAA ayakwazi ukwelapha ngokugcwele noma ngokwanele emazingeni okushisa aphansi afika ku-138C imizuzu engu-20, inqobo nje uma kusetshenziswa isilinganiso esigcwele se-stoichiometric resin kuya ku-hardener . Ama-powder akhiwe kusuka kulawa masistimu anethuba lokumboza ama-nonmetallic substrates.
I-Hydroxyalkylamide(HAA)