I-TGIC yokutshintshwa kweekhemistri kwi-powder coating-Hydroxyalkylamide (HAA)

IHydroxyalkylamide(HAA) TGIC Replacement chemistries

Njengoko ikamva le-TGIC lingaqinisekanga, abavelisi bafuna enye indawo elinganayo. I-HAA yonyango efana ne-Primid XL-552, iphuhliswe kwaye iphawulwe yi-Rohm kunye ne-Haas, iye yaziswa. Eyona nto ibuyisela umva kwezo ziqinisi kukuba, njengoko indlela yokunyanga ikukusabela kokujiya, iifilimu ezakha zafikelela kubukhulu obungaphezulu kwe-2 ukuya kwi-2.5 mil (i-50 ukuya kwi-63 microns) zinokubonisa ukukhupha umoya, ukuphina, kunye nokuhamba kakubi kunye nokulinganisa. Oku kuyinyani ngakumbi xa ezi zonyango zisetyenziswa kunye neepolyester eziqhelekileyo ze-carboxy ezenzelwe indibaniselwano ye-TGIC.
Izizukulwana ezitsha ze-carboxy polyesters, eziphuhliswe okanye ziphuhliswa yi-EMS, i-Hoechst Celanese, kunye ne-Ruco, ukuze zisetyenziswe kunye ne-Primid XL-552, zinciphisa uninzi lwezi ngxaki, nangona kunjalo. iphuculwe ngokusebenzisa amanani angaphantsi kwe-stoichiometric of harder. Iziphumo ezifanayo zinokufezekiswa ngokongeza inani elincinci le-isophorone diisocyanate (IPDI) evaliweyo kwinkqubo ye-Primid epheleleyo ye-stoichiometric, esebenzayo neut.ralinika ezinye ze-HAA. Ngaphaya koko, idatha eqokelelwe emva kokuvezwa kwesizukulwana esitsha se-carboxy polyester/HAA kunye nenkqubo ye-carboxyl polyester ephucukileyo ye-TGIC ukuya e-Florida ukukhanya kwelanga iminyaka emi-2 ibonisa ukuba ezi khemistri zifana nemozulu. Kwaye uvavanyo lwaseFlorida esilwenzileyo lubonisa ukuba iinkqubo ezahlukeneyo ze-Primid ezinemibala zibonisa ukuguquguquka okungaphantsi kokulahlekelwa kwegloss ukuba iinkqubo eziqhelekileyo ze-TGIC ezine-pigmentation efanayo kunye nomxholo wokuzalisa.
Ezinye izongezo zodidi lwe-surfactant zinokuvumela iifilimu ukuba zakhe ukuya kuthi ga kwi-3 mils (75 microns) ngaphandle kokubonisa ukuphuma komoya okanye ezinye iingxaki ezinkulu zomhlaba. Iikhompawundi zeDiphenoxy zidityaniswa ne-benzoin kwi-carboxy polyester HAA chemistries yokubonakala kwefilimu engcono kunye nokuncipha komthubi.
Ezinye iinkqubo zesizukulwana esitsha se-carboxy polyester / HAA ziyakwazi ukunyangwa ngokupheleleyo okanye ngokwaneleyo kumaqondo obushushu asezantsi njenge-138C kangangemizuzu engama-20, ukuba nje umlinganiselo opheleleyo we-stoichiometric resin ukuya kwi-hardener isetyenziswa. Umgubo owenziwe kwezi nkqubo unamathuba okugquma ii-nonmetallic substrates.

IHydroxyalkylamide(HAA)