Nitrogen-based nplaim retardants
Cov tshuaj tua hluav taws uas muaj nitrogen, tsab xov xwm no tsom mus rau melamine thiab nws cov khoom siv, qee qhov siv tau ib leeg lossis yog cov khoom tseem ceeb ntawm cov tshuaj tua hluav taws uas ua rau muaj hluav taws kub. Cov tshuaj tua hluav taws no tsis muaj halogen, tsis muaj pa luam yeeb ntau, ruaj khov rau cua sov thiab lub teeb, muaj kev ua haujlwm zoo rau kev tua hluav taws thiab tus nqi qis. Qhov teeb meem nrog lawv yog tias cov yas uas lawv siv los tua hluav taws nyuaj rau kev ua thiab tsis tawg zoo hauv cov khoom siv hauv paus. Cov kev cai rau qhov loj me ntawm cov khoom me me thiab kev faib tawm ntawm cov khoom me me yog qhov nruj dua thiab qee zaum xav tau cov neeg sawv cev sib npaug. Ntxiv rau melamine, kuj tseem muaj melamine cyanurate (MCA) , phosphates, borates, guanidine ntsev, dicyandiamide ntsev, thiab lwm yam. Cov tshuaj tua hluav taws no siv rau hauv PA, PU thiab PO. Lawv siv tau rau hauv PA, PU, PO, PET, PS, PVC thiab epoxy resins, thiab kuj tsim nyog rau cov ntaub, xim, ntoo thiab ntawv.
Ib qho ntawm kev siv cov tshuaj nitrogen ua cov tshuaj tiv thaiv hluav taws yog ua ke nrog cov tshuaj tiv thaiv hluav taws uas muaj phosphorus kom tau txais cov txiaj ntsig phosphorus-nitrogen synergistic. Cov sib xyaw ntawm cov tshuaj nitrogen nrog cov tshuaj phosphorus muaj cov txiaj ntsig hluav taws ntau dua rau cellulose dua li qhov sib sau ua ke ntawm cov txiaj ntsig hluav taws ntawm cov tshuaj sib xyaw. Nitrogen txhawb nqa phosphorylation ntawm cellulose los ntawm phosphoric acid thiab yog li ntawd pab txhawb rau cov txiaj ntsig hluav taws o. Yog li ntawd, cov khoom xyaw nquag ntawm ntau cov tshuaj tiv thaiv hluav taws intumescent yog phosphorus thiab nitrogen.
Melamine
Melamine (MA) tsis kub hnyiab, yooj yim sublimated thaum cua sov, thiab lwj thaum cua sov sai. Vim li cas nws thiaj li yog ib qho khoom siv hluav taws kub zoo heev yog:
- Cov tshuaj tiv thaiv kev lwj tshwm sim ntawm 250 txog 450 ° C, nqus tau ntau qhov kub thiab tso tawm ammonia los tsim ntau yam condensates;
- Lub peev xwm los cuam tshuam rau tus cwj pwm yaj ntawm cov khoom siv thiab ua kom nws cov charring sai dua rau hauv coke.
Melamine pheej yig, tsis xeb, tsis ua rau khaus tawv nqaij thiab qhov muag, thiab tsis yog ib yam khoom mutagen. Qhov tsis zoo yog tias nws tsim cov tshuaj lom cyanide thaum lwj ntawm qhov kub siab.
Melamine yog ib yam khoom siv tiv thaiv hluav taws uas siv dav heev, tshwj xeeb yog ua ib feem ntawm cov tshuaj tiv thaiv hluav taws kub thiab rau cov polyurethane thiab triazine resins uas tiv thaiv hluav taws. Siv ua ke nrog cov kua phosphate esters, melamine yog siv dav heev los tiv thaiv hluav taws polyurethane ua npuas ncauj.
Melamine cyanurate
Melamine cyanurate yog tsim los ntawm kev sib xyaw melamine nrog cyanuric acid, hu ua MCA. Nws yog ib qho roj nplua nyeem thiab tiv thaiv hluav taws, hmoov dawb crystalline, tsis muaj ntxhiab thiab tsis qab. Nws ruaj khov heev hauv qab 300 ° C thiab pib sublimate li 350 ° C, tab sis tsis lwj, nws qhov kub lwj yog li 440 ~ 450 ° C. MCA muaj cov nitrogen ntau, yooj yim heev rau nqus cov dej noo, kub siab dehydration rau hauv charcoal, hlawv nitrogen roj, dilute qhov concentration ntawm oxygen thiab polymer decomposition los ntawm cov roj. Ntxiv mus, lub cim ntawm cov roj thiab thermal convection tshem tawm ib feem ntawm cov cua sov, yog li muab cov haujlwm tiv thaiv hluav taws.
MCA siv dav hauv roj hmab, nylon, phenolic resins, epoxy resins, acrylic emulsions thiab lwm yam olefin resins. MCA siv ua cov tshuaj tiv thaiv hluav taws rau epoxy resins. Cov pa oxygen index nce ntxiv ntawm 24% txog 28% txog 46% txog 48% thiab nws yog qhov tsim nyog rau cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob. Nws yog ntxiv rau vinyl acetate emulsions, acrylate emulsions thiab roj hmab emulsions los ua cov txheej txheem tiv thaiv hluav taws nrog kev nplaum zoo heev thiab du, thiab tsis muaj xim sib kis.
MCA yog ib qho tshuaj tua hluav taws triazine uas muaj cov yam ntxwv zoo heev thiab nws siv lossis sib xyaw nrog lwm cov tshuaj tua hluav taws zoo dua li siv melamine ib leeg.
Melamine phosphonates
Melamine phosphonates tuaj yeem npaj tau los ntawm melamine thiab monophenylphosphonic acid. Qhov tsis zoo yog tias nws nyuaj rau npaj thiab tiv thaiv nws kom tsis txhob ua npuas thaum sib xyaw nrog polyolefins, degassing yog nqa tawm. Cov tshuaj tua hluav taws no kuj tseem tuaj yeem ua rau muaj xim paug. Nws yog siv dav ua cov tshuaj tua hluav taws rau polyolefins thiab polystyrene.
Melamine pyrophosphate
Melamine pyrophosphate tuaj yeem tsim los ntawm kev kho melamine nrog phosphoric acid thiab tom qab ntawd cua sov nws ntawm 250-270 ° C. Muaj ntau yam tshuaj tua hluav taws rau cov fibers, textiles thiab qee cov yas, tab sis cov nyhuv tua hluav taws ntawm polyurethane plastics tsis txaus siab, thaum melamine pyrophosphate tuaj yeem siv tau zoo los tua hluav taws polyurethane plastics. Polypropylene tua hluav taws los ntawm nws cov khoom tshuaj tiv thaiv nrog pentaerythritol lossis nws cov khoom tshuaj tiv thaiv nrog pentaerythritol thiab phosphoric acid kuj tseem tuaj yeem tsim cov khoom siv coking uas tsis kub hnyiab, tsis ntws.
Yog xav paub ntxiv lossis xav tau cov qauv dawb lossis cov nqe lus hais txog tus nqi, thov hu rau peb ntawm email: [email protected] , lossis hu rau peb ntawm: +86-28-8411-1861.
Qee cov duab thiab cov ntawv luam tawm los ntawm Is Taws Nem, thiab cov ntawv pov thawj yog los ntawm tus sau thawj. Yog tias muaj kev ua txhaum cai, thov hu rau peb kom tshem tawm.