Zoletsa MotoZowonjezera Zachiwiri Zazikulu za Rabara ndi Pulasitiki
Choletsa motondi wothandizira wogwiritsidwa ntchito poletsa zinthu kuti zisayake ndikuletsa kufalikira kwa moto. Amagwiritsidwa ntchito makamaka mu zinthu za polima. Pogwiritsa ntchito zinthu zopangidwa kwambiri komanso kusintha pang'onopang'ono kwa miyezo yoteteza moto, zinthu zoletsa moto zimagwiritsidwa ntchito kwambiri mu mapulasitiki, rabara, zokutira, ndi zina zotero. Malinga ndi zinthu zazikulu zothandiza mu FR, zitha kugawidwa m'magulu atatu: zinthu zoletsa moto zosapangidwa ndi zinthu zachilengedwe, zinthu zoletsa moto zopangidwa ndi halogenated ndi zinthu zoletsa moto zopangidwa ndi phosphorous.
Zoletsa moto zosapangidwa ndi chilengedweImagwira ntchito mwathupi, yomwe ili ndi mphamvu zochepa komanso yowonjezerapo kwambiri. Imakhudza magwiridwe antchito a zipangizo. Komabe, chifukwa cha mtengo wotsika ingagwiritsidwe ntchito pazinthu zotsika mtengo zomwe sizimafunikira mphamvu zambiri, monga mapulasitiki a PE, PVC, ndi zina zotero. Mwachitsanzo, aluminium hydroxide (ATH) idzawonongeka ndi madzi ndi kuwonongeka ikatenthedwa mpaka 200 ℃. Kuwonongeka kwa zinthu kumatenga kutentha ndi madzi, kuti kulepheretse kukwera kwa kutentha kwa zinthuzo, kuchepetsa kutentha kwa zinthuzo, kuchepetsa liwiro la kutentha komwe kumachitika. Nthawi yomweyo, nthunzi ya madzi imatha kuchepetsa kuchuluka kwa mpweya ndikuletsa kuyaka. Alumina yomwe imapangidwa ndi kuwonongeka imalumikizidwa pamwamba pa zinthuzo, zomwe zingalepheretse kufalikira kwa moto.
Zoletsa moto za halogen zachilengedweAmagwiritsa ntchito njira ya mankhwala makamaka. Mphamvu yake ndi yayikulu ndipo kuwonjezera kwake kumagwirizana bwino ndi ma polima. Amagwiritsidwa ntchito kwambiri mu electronic castings, printed circuit boards ndi zida zina zamagetsi. Komabe, amatulutsa mpweya woopsa komanso wowononga, womwe uli ndi mavuto ena achitetezo komanso kuteteza chilengedwe.Brominated flame retardants (BFRs)makamaka ndi zinthu zoletsa moto zokhala ndi halogenated. China ndizoletsa moto za chloro-series (CFRs)Kutentha kwawo kowola kumakhala kofanana ndi kwa zinthu za polima. Pamene ma polima atenthedwa ndi kuwola, ma BFR amayambanso kuwola, kulowa m'dera loyaka gasi limodzi ndi zinthu zowola kutentha, kuletsa kuyamwa kwa lawi ndikuletsa kufalikira kwa lawi. Nthawi yomweyo, mpweya wotulutsidwawo umaphimba pamwamba pa zinthuzo kuti utseke ndikuchepetsa kuchuluka kwa okosijeni, ndipo pamapeto pake umachepetsa kuyamwa mpaka utatheratu. Kuphatikiza apo, ma BFR nthawi zambiri amagwiritsidwa ntchito limodzi ndi antimony oxide (ATO). ATO yokha siili ndi mphamvu yoletsa kuyaka, koma imatha kugwira ntchito ngati chothandizira kuti bromine kapena chlorine iwonongeke mwachangu.
Zoletsa moto za phosphorous zachilengedwe (OPFRs)Imagwira ntchito mwakuthupi komanso mwamankhwala, ndi mphamvu zambiri komanso ubwino wa poizoni wochepa, kulimba komanso magwiridwe antchito okwera mtengo. Kuphatikiza apo, imathanso kukonza kusinthasintha kwa alloy, kupereka ntchito yopangira pulasitiki komanso magwiridwe antchito abwino kwambiri. Ndi zofunikira zapamwamba zoteteza chilengedwe, ma OPFR pang'onopang'ono akusintha ma BFR ngati zinthu zazikulu.
Ngakhale kuti kuwonjezera kwa FR sikungapangitse kuti zinthuzo zisamavutike ndi moto, kungathandize kupewa "kuyaka kwa flash", kuchepetsa kuyaka kwa moto ndikupatsa anthu nthawi yochuluka yothawirako. Kulimbikitsidwa kwa zofunikira za dziko lonse paukadaulo woletsa moto kumapangitsanso kuti chiyembekezo cha chitukuko cha FR chikhale chachikulu.
Nthawi yotumizira: Novembala-19-2021