I-nitrogen-based retardants yomlilo
Ezi zithinteli zomlilo ezisekelwe kwiNitrogen, eli nqaku ligxile kwi-melamine kunye nezinto eziphuma kuyo, ezinye zazo zingasetyenziswa zodwa okanye zezona zinto ziphambili zezithinteli zomlilo ezingaphakathi. Ezi zithinteli zomlilo azina-halogen, azitshisi kakhulu, zizinzile kwaye azinakukhanya, zisebenza kakuhle kwaye zixabisa kancinci. Ingxaki ngazo kukuba iiplastiki ezisetyenziselwa ukuthintela umlilo kunzima ukuzicoca kwaye azisasazeki kakuhle kwizinto ezisisiseko. Iimfuneko zobukhulu beesuntswana kunye nokusasazwa kobukhulu beesuntswana ziqinile kwaye ngamanye amaxesha kufuneka iiarhente ezisebenzayo. Ukongeza kwi-melamine, kukwakho ne -melamine cyanurate (MCA) , ii-phosphates, ii-borates, ii-guanidine salts, ii-dicyandiamide salts, njl. Ezi zithinteli zomlilo zisetyenziswa kwi-PA, PU kunye ne-PO. Zingasetyenziswa kwi-PA, PU, PO, PET, PS, PVC kunye nee-epoxy resins, kwaye zifanelekile nakwimpahla yokuluka, iipeyinti, iinkuni kunye nephepha.
Enye yezona zinto zisetyenziswayo kwiikhompawundi eziqulethe i-nitrogen njenge-flame retardants idibene ne-phosphorus-containing flame retardants ukufumana i-synergistic phosphorus-nitrogen effect. Imixube ye-nitrogen-containing compounds kunye ne-phosphorus-containing compounds ineempembelelo eziphezulu ze-flame-retardant kwi-cellulose kune-sum of the flame-retardant effects of the individual compounds. I-nitrojeni ikhuthaza i-phosphorylation ye-cellulose nge-asidi ye-phosphoric kwaye ngaloo ndlela inegalelo ekudumbeni kwe-flame-retardant effect. Ngoko ke, amacandelo asebenzayo amaninzi e-intumescent flame retardants yi-phosphorus kunye ne-nitrogen.
Mandisa
I-Melamine (MA) ayinakutsha, i-sublimated ngokulula xa ishushu, kwaye iyabola xa ishushu kakhulu. Izizathu ezibangela ukuba ibe yeyona nto ibalaseleyo yokunqanda amadangatye zezi:
- Iimpendulo zokubola zenzeka kwi-250 ukuya kwi-450 ° C, ifunxa ubushushu obukhulu kwaye ikhuphe i-ammonia ukuze yenze iindidi ze-condensates;
- Ukukwazi ukuphembelela ukuziphatha okunyibilikayo kwezinto kunye nokukhawulezisa ukutshalwa kwayo kwi-coke.
I-Melamine ayibizi, ayidli, ayicaphukisi ulusu kunye namehlo, kwaye ayiyiyo i-mutagen. Ububi kukuba ivelisa i-cyanide eyityhefu xa ibolile kumaqondo obushushu aphezulu.
I-Melamine sisisithinteli somlilo esisetyenziswa kakhulu, ngakumbi njengenxalenye yezithambisi zedangatye ezitshisayo kunye ne-polyurethane ebuyisela idangatye kunye ne-triazine resins. Isetyenziswa ngokudityaniswa nee-esters ze-phosphate esters, i-melamine isetyenziswa kakhulu ukutshisa amagwebu e-polyurethane edangatye.
I-Melamine cyanrate
I-Melamine cyanrate iveliswa ngokusabela kwe-melamine kunye ne-cyanuric acid, ebizwa ngokuba yi-MCA. Yinto yokuthambisa kunye nedangatye elibuyiswayo, umgubo omhlophe wekristale, awunavumba kwaye awunancasa. Izinzile kakhulu phantsi kwe-300 ° C kwaye iqala ukuthotywa kwe-sublimate malunga ne-350 ° C, kodwa ayiboli, ubushushu bayo bokubola bumalunga ne-440 ~ 450 ° C. I-MCA iqulethe umxholo ophezulu we-nitrogen, kulula kakhulu ukufunxa ukufuma, ukuchithwa kobushushu obuphezulu kwi-charcoal, ukutshisa igesi ye-nitrogen, i-dilute i-concentration ye-oksijini kunye nokubola kwepolymer okwenziwa yigesi. Ngaphezu koko, isizukulwana segesi kunye ne-thermal convection ithatha inxalenye yobushushu, ngaloo ndlela inikezela umsebenzi wokunqanda ilangatye.
I-MCA isetyenziswa ngokubanzi kwirabha, inayiloni, kwintlaka zephenolic, iiresin epoxy, emulsions acrylic kunye nezinye olefin resins. I-MCA isetyenziswa njenge-flame retardant kwii-epoxy resins. Isalathiso seoksijini sinyuswe ukusuka kwi-24% ukuya kwi-28% ukuya kwi-46% ukuya kwi-48% kwaye ifaneleke ngakumbi amacandelo ombane abuyiswa ngamadangatye kunye neenxalenye. Yongezwa kwi-vinyl acetate emulsions, i-acrylate emulsions kunye ne-emulsions yerabha ukwenza iingubo ezinqanda ilangatye kunye ne-smear adhesion egqwesileyo kunye nokugudiswa, kwaye akukho ukungcoliswa kombala.
I-MCA yi-triazine flame retardant eneempawu ezintle kwaye ukusetyenziswa kwayo okanye ukuxuba nezinye izinto ezithintela umlilo kusebenza ngakumbi kunokusebenzisa i-melamine yodwa.
Iiphosphonates zeMelamine
I-Melamine phosphonates inokulungiswa kwi-melamine kunye ne-monophenylphosphonic acid. Ukungalungi kukuba kunzima ukuyilungisa kunye nokukhusela ukuba igwebu xa idibanisa ne-polyolefins, i-degassing yenziwa. Esi sikhuseli somlilo sinokubangela ukungcoliseka kombala. Isetyenziswa ngokubanzi njengento yokunqanda ilangatye kwi-polyolefins kunye ne-polystyrene.
I-Melamine pyrophosphate
IMelamine pyrophosphate inokuveliswa ngokunyanga imelamine ngephosphoric acid kwaye emva koko iyifudumeze ku 250-270°C. Zininzi iiretardants zedangatye kwiintsinga, iingubo kunye neeplastiki ezithile, kodwa impembelelo yokunqanda umlilo kwiiplastiki ze-polyurethane ayonelisi, ngelixa i-melamine pyrophosphate ingasetyenziswa ngokufanelekileyo ukutshisa iiplastiki ze-polyurethane edangazelayo. I-polypropylene ene-flame retardant ngemveliso yayo kunye ne-pentaerythritol okanye imveliso yayo yokusabela kunye ne-pentaerythritol kunye ne-asidi ye-phosphoric nayo inokwenza into enokutsha evuthayo, engavuziyo.
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