I-Ammonium Polyphosphate (i-APP): Sombulula uMda we-REACH kwiFomulation yeCoating Retardant Coating

Njengoko imithetho ye-EU REACH kunye nemigangatho yehlabathi yokusingqongileyo iqina, abavelisi beengubo ezithintela umlilo bajongene nemingeni ebalulekileyo yokuthobela imithetho. Imiqathango kwiihalogens, iintsimbi ezinzima kunye neePBDE zenza ukuba iifomyula zemveli zingathengiswa, ngelixa imfuno ethintela ilangatye kwiimeko zoshishino kunye noluntu isaqhubeka inamandla. I-Ammonium polyphosphate (APP) sisisombululo esiphambili sokulinganisela ukuthobela kunye nokusebenza, ngenxa yeempawu zayo ezizinzileyo nezingenahalogens.

I-REACH ithintela iikhemikhali eziyingozi ezingaphezu kwama-2000, kuquka izinto ezithintela ilangatye ezifakwe i-halogenated kwiingubo zemveli. Ii-PBB kunye nee-PBDE azivumelekanga ngenxa yokuba zihlala ixesha elide kwaye zinobungozi, kwaye abavelisi abangathobeliyo bajongene nokubanjwa, ukuhlawuliswa okanye ukukhutshwa kwimarike.

Ngaphandle kokuthobela imithetho, izinto ezithintela ilangatye ezine-halogenated zikhupha iigesi ezinobuthi xa zitshisiwe kwaye zingadibani kakuhle ne-epoxy/acrylic resins, nto leyo ebangela ukuba kubekho ukuqhekeka kunye nokunamathela okunciphileyo—nto leyo ebangela ukuba kubekho ezinye iindlela eziluhlaza.

Njenge-halogen-free inorganic flame retardant, i-APP iyahlangabezana neemfuno ze-REACH ngokwemvelo. Icandelo layo eliphambili (NH4)n+2PnO3n+1 alinazo izinto ezithintelweyo kwaye libhaliswe yi-REACH. Ngolwakhiwo olumhlophe lwekristale (inqanaba lokunyibilika 240-280℃, ubushushu bokubola >300℃), ihlala izinzile ngexesha lokucocwa kwepeyinti.

I-APP ifezekisa ukulibaziseka komlilo ngokwenziwa kwekhabhoni engaphakathi: ubushushu obuphezulu bubangela ukukhululwa kwe-ammonia kunye ne-polyphosphoric acid, nto leyo ekhuthaza i-substrate carbonization ukuze yenze umaleko okhusela ioksijini. Ngokungafaniyo neendlela ze-halogenated, ayivelisi zigesi zinobuthi, ezihambelana neendlela eziluhlaza.

Ukulungiswa kwefomyula kuvula amandla apheleleyo e-APP. Kwizinto zokugquma ezisekelwe emanzini, i-APP yodidi lwemizi-mveliso (i-n≥1000 polymerization degree) iqinisekisa ukunyibilika kunye nokuhambelana, ithintela imvula. Kwizinto zokugquma ezisekelwe kwi-solvent, ukuguqulwa kwe-silane coupling agent kwandisa ukusasazeka kunye nokunamathela.

I-APP ihambelana kakuhle ne-melamine kunye ne-pentaerythritol kwinkqubo ye-intumescent. Uvavanyo lwemizi-mveliso luqinisekisa ukuba ii-coating ezine-25-30% APP (mass fraction) zihlangabezana ne-GB/T 8624-2012 B1 flame retardant level kunye ne-grade 1 adhesion, nto leyo eyanelisa uninzi lwezicelo.

Phakathi kokuphuculwa kokusingqongileyo, i-APP iqhuba utshintsho kwishishini le-coating elithintela umlilo. Iimpawu zayo ezingenayo i-halogen, ezihambelanayo nezizinzileyo zisombulula iindawo zentlungu ze-REACH kwaye zixhasa ukhuseleko lomlilo—ubuchule bokusebenzisa i-APP kubalulekile kubavelisi ukuba bakhuphisane.