Ekwandiseni ukwakheka kwe-sealant, i-ammonium polyphosphate (APP) idlala indima ebalulekile ekuqiniseni ukumelana nomlilo.
I-APP ivame ukusetshenziswa njengesivimbeli somlilo ekwandiseni ukwakheka kwe-sealant. Uma ibekwa emazingeni okushisa aphezulu ngesikhathi somlilo, i-APP idlula ekuguqulweni kwamakhemikhali okuyinkimbinkimbi. Ukushisa kubangela ukukhishwa kwe-phosphoric acid, esabela nama-free radicals akhiqizwa yinqubo yokushisa. Lokhu kusabela kwamakhemikhali kukhuthaza ukwakheka kwesendlalelo se-char esiminyene. Le sendlalelo se-char sisebenza njengesivimbeli sokuvikela, sinciphisa ngempumelelo ukudluliselwa kokushisa nomoya-mpilo ezintweni ezingaphansi, ngaleyo ndlela sivimbele ukusabalala kwamalangabi.
Ngaphezu kwalokho, i-APP isebenza njengesivimbeli somlilo esingaphakathi kwe-intumescent ekwandiseni ama-sealant formulations. Uma zivezwa emlilweni, izithasiselo ezingaphakathi kwe-intumescent, okuhlanganisa ne-APP, zidlula enkambisweni yokuvuvukala, ukusha, nokwakha ungqimba oluvikelayo lokuvikela. Lolu ngqimba lusiza ekunciphiseni ukudluliselwa kokushisa nokukhishwa kwamagesi angashi, ngaleyo ndlela kubambezele ngempumelelo ukusabalala komlilo.
Ngaphezu kwalokho, ukuba khona kwe-APP ezivalweni ezikhulayo kuthuthukisa ukumelana kwazo nomlilo futhi kuhlangabezana nezindinganiso eziqinile zokuphepha emlilweni. I-char eyakheka ngenxa yokusabela kwe-APP ivikela ngempumelelo izinto ezingaphansi, inikeze isikhathi esengeziwe sokuphendula eziphuthumayo kanye nokuphuma uma kwenzeka umlilo.
Ekuphetheni, ekwandiseni ukwakheka kwe-sealant, ukufakwa kwe-ammonium polyphosphate kuthuthukisa kakhulu ukumelana nomlilo ngokukhuthaza ukwakheka kwesendlalelo se-char esivikelayo, ukunciphisa ukushisa kanye nokudluliswa komoya-mpilo, kanye nokunikeza isithiyo esisebenzayo ekusabalaleni kwamalangabi. Lokhu kunegalelo ekuphepheni komlilo jikelele kanye nokusebenza kwemikhiqizo ye-sealant ekhulayo ezinhlotsheni ezahlukahlukene.
Isikhathi sokuthunyelwe: Disemba-22-2023
