Mapangidwe a Polyurethane AB Adhesive Powder Flame Retardant

Mapangidwe a Polyurethane AB Adhesive Powder Flame Retardant
Kutengera kufunikira kwa zomatira za polyurethane AB zopanda halogen zopanda malawi, kuphatikizika ndi mawonekedwe ndi ma synergistic amafuta oletsa moto monga aluminium hypophosphite (AHP), aluminium hydroxide (ATH), zinc borate, ndi melamine cyanurate (MCA), njira zitatu zotsatirazi zidapangidwa. Mapangidwewa alibe klorini ndipo amayang'ana kwambiri kukhathamiritsa koletsa moto, kugwirira ntchito kwathupi, komanso kuthekera kwazinthu:

1. High Flame Retardancy Formulation (Kwa poto wamagetsi, kuyika batire, chandamale UL94 V-0)

Kuphatikiza kwa Core Flame Retardant:

• Aluminium hypophosphite (AHP): 8-12 phr (mtundu wa polyurethane-wokutidwa ndi madzi womwe ukulimbikitsidwa kuthana ndi vuto la mvula)
• Aluminiyamu hydroxide (ATH): 20-25 phr (submicron kalasi, 0.2-1.0 μm, kupititsa patsogolo mpweya index ndi char compactness)
• MCA: 5-8 phr (machitidwe a gas-phase, synergistic ndi AHP mu gawo lofupikitsidwa)
• Zinc borate: 3-5 phr (imalimbikitsa mapangidwe a ceramic char ndikuletsa kusuta)

Zomwe Tikuyembekezera:

• Mlozera wa oxygen (LOI): ≥32% (PU yoyera ≈22%);
• UL94 mlingo: V-0 (1.6 mm makulidwe);
• Kutentha kwamafuta: 0.45-0.55 W/m·K (yoperekedwa ndi ATH ndi zinc borate);
• Kuwongolera kwamakayendedwe: 25,000-30,000 cP (mankhwala apamwamba amafunikira kuti ateteze kugwa).

Njira Yaikulu:

• AHP iyenera kubalalitsidwa kale mu gawo la polyol (Gawo A) kupewa kuchitapo kanthu msanga ndi isocyanate (Gawo B);
• ATH iyenera kusinthidwa ndi silane coupling agent (mwachitsanzo, KH-550) kuti ipititse patsogolo kulumikizana.

2. Kupanga Pazonse Zotsika Zotsika (Zosindikiza zomanga, zomangira mipando, chandamale UL94 V-1)

Kuphatikiza kwa Core Flame Retardant:

• Aluminiyamu hydroxide (ATH): 30-40 phr (muyezo wa micron-grade, yotsika mtengo, filler-type retardant flame);
• Ammonium polyphosphate (APP): 10-15 phr (yophatikizidwa ndi MCA ya intumescent system, m'malo mwa ma halogenated agents);
• MCA: 5-7 phr (chiwerengero cha APP 1: 2 ~ 1: 3, imalimbikitsa kupanga thovu ndi kudzipatula kwa okosijeni);
• Zinc borate: 5 phr (kuletsa utsi, mapangidwe othandizira).

Zomwe Tikuyembekezera:

• LOI: ≥28%;
• UL94 mlingo: V-1;
• Kuchepetsa mtengo: ~ 30% (poyerekeza ndi mapangidwe amoto-ochedwa kwambiri);
• Kusunga mphamvu zolimba: ≥80% (APP imafuna encapsulation kuteteza hydrolysis).

Njira Yaikulu:

• APP iyenera kukhala ndi microencapsulated (mwachitsanzo, yokhala ndi melamine-formaldehyde resin) kupeŵa kuyamwa kwa chinyezi ndi kupanga thovu;
• Onjezani 1-2 phr hydrophobic fumed silica (mwachitsanzo, Aerosil R202) ya anti-kukhazikitsa.

3. Low-Viscosity Easy-Process Formulation (Kuti agwirizane mwatsatanetsatane zamagetsi, zomwe zimafuna kuyenda kwakukulu)

Kuphatikiza kwa Core Flame Retardant:

• Aluminiyamu hypophosphite (AHP): 5-8 phr (nanosized, D50 ≤1 μm);
• Madzi a organic phosphorous flame retardant (BDP njira ina): 8-10 phr (mwachitsanzo, halogen-free phosphorous-based DMMP zotumphukira, kusunga mamasukidwe akayendedwe);
• Aluminiyamu hydroxide (ATH): 15 phr (ozungulira aluminiyamu gulu, kugwirizanitsa matenthedwe matenthedwe);
• MCA: 3-5 phr.

Zomwe Tikuyembekezera:

• Makanema osiyanasiyana: 10,000-15,000 cP (pafupi ndi machitidwe oletsa moto wamadzimadzi);
• Kutentha kwamoto: UL94 V-0 (yowonjezeredwa ndi phosphorous yamadzi);
• Thermal conductivity: ≥0.6 W/m·K (yoperekedwa ndi aluminiyamu yozungulira).

Njira Yaikulu:

• AHP ndi aluminiyamu yozungulira ayenera kusakanizidwa ndi kumwazikana pansi pa kukameta ubweya wambiri (≥2000 rpm);
• Onjezani 4-6 phr molecular sieve desiccant ku Gawo B kuti mupewe kuyamwa kwa chinyezi cha AHP.

4. Kuphatikiza Mfundo Zaumisiri & Njira Zina

1. Njira za Synergistic:

• AHP + MCA:AHP imalimbikitsa kutaya madzi m'thupi ndi kutentha, pamene MCA imatulutsa mpweya wa nayitrogeni ikatenthedwa, kupanga chisa chonga char char.
• ATH + Zinc borate:ATH imayamwa kutentha (1967 J/g), ndipo zinki borate imapanga galasi lagalasi lophimba pamwamba.

2. Njira Zina Zoletsa Moto:

• Zotsatira za polyphosphazene:Kuchita bwino kwambiri komanso kochezeka, pogwiritsa ntchito byproduct HCl;
• Epoxy silicone utomoni (ESR):Ikaphatikizidwa ndi AHP, imachepetsa kutsitsa kwathunthu (18% ya V-0) ndikuwongolera makina.

3. Kuwongolera Zowopsa:

• Sedimentation:Anti-settlement agents (mwachitsanzo, polyurea-modified mitundu) chofunika ngati mamasukidwe akayendedwe <10,000 cP;
• Kuletsa Kuletsa:Pewani zoletsa zamchere zamchere (mwachitsanzo, MCA) kuti mupewe kusokoneza machitidwe a isocyanate.

5. Malangizo Othandizira

• Yang'anani kuyezetsa mawonekedwe apamwamba-lawi lamoto-retardancy: yokutidwa AHP + submicron ATH (avereji ya tinthu tating'ono 0,5 μm) pa AHP: ATH:MCA = 10:20:5 kuti muyambe kukhathamiritsa.
• Mayeso ofunikira:
  → LOI (GB/T 2406.2) ndi UL94 kuwotcha molunjika;
  → Bond mphamvu pambuyo pa njinga matenthedwe (-30 ℃ ~ 100 ℃, maola 200);
  → Mvula yobwereranso ndi malawi pambuyo pokalamba kwambiri (60 ℃/7d).

Flame Retardant Formulation Table