Mumhuri inodzivirira moto, kune MCA inopisa inodzivirira moto mumakore achangopfuura, kunyangwe kamwe chete yaishomeka. Saka chii chinonzi MCA inodzivirira moto, unonzwisisa? Pfungwa yekudzivirira moto yakajeka? Ngatitarisei pamwe chete!
Chii chinonzi nitrogen-based flame retardants?
Parizvino, nitrogen-based flame retardants inonyanya kusanganisira matatu: melamine, dicyandiamide, guanidine munyu (guanidine carbonate, guanidine phosphate, guanidine phosphate condensed uye guanidine sulfamate) uye zvinobva kwavari, kunyanya phosphate derivatives.
- Melamine
Melamine inowanzo shandiswa sechinhu chinopupuma mukugadzira machira asingapindi moto, ane mhepo yakanaka yekupupa uye dense kabhoni. Pamusoro pekushandiswa semurazvo wemoto wega, iyo inowanzo shandiswa inodzoreredza murazvo munyu unobva pakuita neasidhi uye unoshandiswa zvakanyanya muPE, PP uye PVC mapurasitiki uye mamwe thermoplastic uye thermosetting mapurasitiki. Yakasanganiswa neyemvura phosphate, melamine inoshandiswa zvakanyanya mumurazvo wemoto retardant polyurethane furo.
- Dicyandiamide
Dicyandiamide inonyanya kushandiswa mukugadzira guanidinium salt flame retardants, inogona kutsiva melamine kana kusanganiswa nemelamine. European patents inoshuma kuti dicyandiamide yakasanganiswa muzvikamu zvakaenzana uye yakawedzerwa pa5% inogona kuita kuti polyamide iwane UL94 V-0 flame retardant effect, uye iyi flame retardant haina mhedzisiro pakubvaruka kwechinhu. Pamusoro pezvo, dicandiamide inogona kushandiswa kugadzira guruu isingapindi moto yehuni.
- Guanidine munyu
Kunze kwekushandiswa sepakati pemishonga uye dhayi, guanidine munyu unowanzo shandiswa senge zvinodzoreredza murazvo wemidziyo ine cellulose, sehuni, bepa uye makadhibhokisi. Izvi zvinodzosa moto zvinogara kwenguva refu-zvisingadzoreki uye hazvina hygroscopic pane inorganic flame retardants uye zvine maitiro akanaka ekushongedza, saka anoshandiswa zvakanyanya mukugadzirwa kwepamusoro-giredhi yekushongedza huni. Uye zvakare, inogona zvakare kushandiswa sechikamu cheiyo inopupuma mumiriri mune intumescent fireproof machira.
MCA ndeyekuwedzera murazvo wemoto unodzoreredza wakagadzirwa kubva kumelamine uye cyanuric acid pane imwe tembiricha uye yakasanganiswa nemvura sepakati. Haina chepfu, haina kunhuwa uye haina kunaka, uye ine tembiricha yekuora yakanyanya (yakadzikama pa300°C, ichiora pamusoro pe600°C). Iyo haina chete yakanaka inodzoreredza moto, asi zvakare ine hutsi hudiki panguva yekugadziriswa, kuenderana kwakanaka nezvinhu zvepolymer uye hapana chiitiko chekufamba kwepasi. Inonyanya kushandiswa murazvo retardant yenylon, PBT, PP, epoxy resin, organosilicon, polyurethane, rubber nezvimwe zvinhu zvepolymer. Yayo-inodzoreredza mhedzisiro yakanaka, uye inogona kuve yakanaka synergistic mhedzisiro ine phosphorus, bromine uye antimony flame retardants, uye inogona zvakare kushandiswa pamwe chete nezvimwe zvinowedzera kuti uwane yakanaka-inodzoreredza murazvo. Kubva pakuona kwehupfumi, ndiyo inonyanya kushanda murazvo wemoto wezvinhu zvenylon. Mabhuku anoshuma kuti kuwedzera kwegumi muzana chikamu chechikamu cheMCA kune naironi 10, naironi 6 kana misanganiswa yavo inogona kuwana UL66 V-94 murazvo unodzoreredza mwero.
Flame retardant mechanism
Zvinowanzotendwa kuti nitrogen flame retardants inowanzoburitsa magasi asingabatike akadai seammonia, nitrogen, yakadzika nitrogen oxides uye mhute yemvura kana yaora nekupisa. Chizvarwa chemagasi aya uye kuparara kwezvidziviriro zvemoto zvinotora kupisa kwakawanda, zvichideredza zvakanyanya kupisa kwepamusoro kwepolymer.
Uye aya magasi asingabatike, akadai senitrogen, haangoite basa rekudiridza okisijeni mumhepo uye kuwanda kwemagasi anopisa anogadzirwa nekuora kwekupisa kwemapolymers, asiwo anopindirana neokisijeni mumhepo kuti ibudise nitrogen, mvura uye okisijeni yakadzika, ichipedza okisijeni pamusoro pechinhu ichi ichiwana yakanaka inodzoreredza murazvo.
Flame retardant zvakanakira
- Low toxicity
Zviyedzo zvebiology zvinoratidza kuti toxicity index yehalogen flame retardants inodiwa kuti iite zvakafanana-inodzoreredza moto kakapetwa kashanu pane yenitrogen flame retardants, uye kuburitsa hutsi hwezvinhu zvepolymer zvakabatwa nenitrogen flame retardants kwakadzikira, yechipiri chete kune simbi-based inorganic flame-retardant fillers. Kunyanya, hutsi hwehutsi pakutanga kwemoto huduku, huchipa vanhu mukana wekupukunyuka uye kufambisa basa rekurwisa moto pakutanga.
- Kushanda kwepamusoro-murazvo wemoto
Kuburikidza nehalides, metal oxides, phosphate flame retardants, inorganic hydrates, hydroxyl compounds, borides, silicates, carbonate compounds, nitrogen compounds ine nguva yekupisa uye exothermic rate yemuedzo inoratidza kuti kushanda kwenitrogen flame retardants ndiko kwakanyanya.
- Kusaora
- Iwo magasi anogadzirwa nenitrogen-aine makomisheni panguva yekupisa anonyanya kukanganisa uye haana kukosha kwakakosha kunokanganisa zvigadzirwa zvemagetsi. Ongororo dzakaratidza kuti nitrogen-based flame retardant yakarapwa maconductor emagetsi kana zvinhu zvemagetsi zvinogona kuramba zvichishandiswa mushure memoto.
- Hapana kupokana nemwenje stabilizer muzvinhu
Nitrogen-based flame retardants haina mapoka anogona nyore kuburitsa mahara radicals se halides, uye nekudaro haadye malight stabilizer mune zvimwe zvinhu.
- High thermal decomposition tembiricha
Iko hakuna chikonzero chekunetseka pamusoro pekuora-kudzoreredza kwemoto panguva yekugadziriswa kwezvinhu, izvo zvinogona kutungamira mukutadza kudzoreredza moto. Izvo zvinhu zvinochengeta zvakanaka zvemichina zvivakwa uye murazvo retardancy kunyangwe mushure mekuwedzera neakawanda-effect extruder.
- Hushamwari kune zvakatipoteredza
Tsvina haikonzeri kusvibiswa kwezvakatipoteredza.
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