Chiyambi cha Nayitrogeni-Mochokera Flame Retardants for Nylon

Chiyambi cha Nayitrogeni-Mochokera Flame Retardants for Nylon

Mafuta oletsa malawi opangidwa ndi nayitrojeni amadziwika ndi kawopsedwe wochepa, kusawononga, kutentha ndi kukhazikika kwa UV, kusagwira ntchito bwino kwa malawi, komanso kutsika mtengo. Komabe, zopinga zawo zimaphatikizapo zovuta pakukonza komanso kubalalika koyipa mu matrix a polima. Zomwe zimagwiritsidwa ntchito pamoto wa nayiloni wamba za nayiloni zimaphatikizapo MCA (melamine cyanrate), melamine, ndi MPP (melamine polyphosphate).

Njira yoletsa moto imakhala ndi zinthu ziwiri:

1. “Sublimation and Endothermic” Physical Mechanism: Chowotcha moto chimachepetsa kutentha kwa zinthu za polima ndikuchilekanitsa ndi mpweya kudzera mu sublimation ndi kuyamwa kutentha.
2. Catalytic Carbonization and Intumescent Mechanism in the Condensed Phase: The flame retardant imalumikizana ndi nayiloni, kulimbikitsa kutulutsa mpweya mwachindunji ndi kukulitsa.

MCA imawonetsa ntchito ziwiri pakuletsa moto, kulimbikitsa onse kutulutsa mpweya komanso kuchita thovu. Njira yoletsa moto ndi mphamvu zimasiyanasiyana malinga ndi mtundu wa nayiloni. Kafukufuku pa MCA ndi MPP mu PA6 ndi PA66 akuwonetsa kuti zoletsa moto izi zimathandizira kulumikizana mu PA66 koma zimalimbikitsa kuwonongeka kwa PA6, zomwe zimapangitsa kuti pakhale ntchito yabwino yoletsa moto ku PA66 kuposa PA6.

1. Melamine Cyanurate (MCA)

MCA imapangidwa kuchokera ku melamine ndi cyanuric acid m'madzi, kupanga chowonjezera cha haidrojeni. Ndiwopanda halogen wabwino kwambiri, wopanda kawopsedwe pang'ono, komanso wochotsa utsi wocheperako womwe umagwiritsidwa ntchito polima nayiloni. Komabe, MCA yachikhalidwe imakhala ndi malo osungunuka kwambiri (kuwola ndi kutsika pamwamba pa 400 ° C) ndipo amatha kusakanikirana ndi utomoni wokhazikika wa tinthu tating'onoting'ono, zomwe zimapangitsa kuti pakhale kufalikira kosiyana ndi kukula kwa tinthu tating'onoting'ono, zomwe zimawononga mphamvu yoletsa moto. Kuphatikiza apo, MCA imagwira ntchito mu gawo la gasi, zomwe zimapangitsa kuti pakhale kutsika kwamoto komanso kutayikira, zigawo zosateteza mpweya pakuyaka.

Kuti athane ndi izi, ukadaulo wamagulu a mamolekyulu wagwiritsidwa ntchito kuti asinthe MCA poyambitsa chowonjezera choletsa moto (WEX), chomwe chimachepetsa kusungunuka kwa MCA, kupangitsa kusungunuka ndi kubalalitsidwa kopitilira muyeso ndi PA6. WEX imapangitsanso mapangidwe a char panthawi yoyaka, kumapangitsa kuti mpweya usanjike bwino komanso kulimbitsa mphamvu yoletsa moto ya MCA, potero imapanga zinthu zoletsa moto zomwe zimagwira ntchito bwino kwambiri.

2. Intumescent Flame Retardant (IFR)

IFR ndi njira yofunika kwambiri yoletsa malawi opanda halogen. Ubwino wake pamagetsi oletsa malawi a halogenated amaphatikiza utsi wochepa komanso kutulutsa mpweya wopanda poizoni pakuyaka. Komanso, char wosanjikiza wopangidwa ndi IFR amatha kuyamwa chosungunuka, choyaka polima, kuteteza kudontha ndi kufalikira kwa moto.

Zigawo zazikulu za IFR ndi:

• Gwero la gasi (mankhwala opangidwa ndi melamine)
• Gwero la asidi (phosphorous-nitrogen retardants lamoto)
• Gwero la kaboni (nayiloni yokha)
• Synergistic zowonjezera (mwachitsanzo, zinki borate, aluminiyamu hydroxide) ndi anti-dripping agents.

Pamene misa chiŵerengero cha phosphorous-nayitrogeni flame retardants kuti melamine zochokera mankhwala ndi:

• Pansi pa 1%: Zosakwanira zoletsa moto.
• Pamwamba pa 30%: Volatilization imachitika panthawi yokonza.
• Pakati pa 1% -30% (makamaka 7% -20%): Kuchita bwino koletsa moto popanda kukhudza kusinthika.

  More info., pls contact lucy@taifeng-fr.com