Polyurethane AB Adhesive Powder Flame Retardant Formulations

Polyurethane AB Adhesive Powder Flame Retardant Formulations
Iyada oo ku saleysan baahida loo qabo hababka dab-demiska halogen-free ee loogu talagalay xabagta polyurethane AB, oo ay weheliso sifooyinka iyo saamaynta isku-dhafka ah ee dab-demiska sida aluminium hypophosphite (AHP), aluminium hydroxide (ATH), borate zinc, iyo melamine cyanurate (MCA), saddexda qorshe ee soo socda ayaa loo qaabeeyey. Hababkani waa kuwo ka xor ah koloriin waxayna diiradda saaraan hagaajinta waxtarka dib u dhigista ololka, waafaqid waxqabadka jireed, iyo habka suurtagalka ah:

1. Qaabaynta Ololka Sare ee Dib-u-Celinta (Wixii loogu talagalay dheri-samaynta elektarooniga ah, daboolida baytariga, bartilmaameedka UL94 V-0)

Isku darka Ololka Muhiimka ah:

• Aluminium hypophosphite (AHP): 8-12 phr (nooc dahaarka leh ee polyurethane ka dhasha biyaha ayaa lagula taliyay in wax laga qabto arrimaha roobabka)
• Aluminium hydroxide (ATH): 20-25 phr (fasalka submicron, 0.2-1.0 μm, si kor loogu qaado tusmada ogsijiinta iyo isafgaradka char)
• MCA: 5-8 phr (habka-wajiga gaaska, la shaqaynta AHP ee wejiga cufan)
• Zinc borate: 3-5 phr (waxay kor u qaadaa samaynta dhuxusha dhoobada waxayna joojisaa qiiqa)

Waxqabadka la filayo:

• Ogsajiinta index (LOI): ≥32% (PU saafi ah ≈22%);
• UL94 rating: V-0 (1.6 mm dhumucdiisuna);
• Dhaqdhaqaaqa kulaylka: 0.45-0.55 W/m · K (oo ay ku biirisay ATH iyo zinc borate);
• Xakamaynta viscosity: 25,000-30,000 cP (daawaynta dusha sare ee loo baahan yahay si looga hortago qallafsanaanta).

Habka Furaha:

• AHP waa in hore loogu sii kala firdhiyaa qaybta polyol (Qaybta A) si looga fogaado falcelinta degdega ah ee isocyanate (Qaybta B);
• ATH waa in lagu beddelaa wakiilka isku xidhka silane (tusaale, KH-550) si kor loogu qaado isku xidhka labada weji.

2. Foomka Guud ee Qiimaha jaban (Lacagta dhismaha, isku xidhka alaabta guriga, bartilmaameedka UL94 V-1)

Isku darka Ololka Muhiimka ah:

• Aluminium hydroxide (ATH): 30-40 phr (heerka mikron-ka caadiga ah, kharash-ku-ool ah, buuxinta-nooca ololka);
• Ammonium polyphosphate (APP): 10-15 phr (oo lagu daray MCA oo loogu talagalay nidaamka intumescent, beddelaya wakiilada halogenated);
• MCA.
• Zinc borate: 5phr (xakamaynta qiiqa, samaynta dhuxusha kaaliyaha).

Waxqabadka la filayo:

• LOI: ≥28%;
• UL94 qiimeynta: V-1;
• Qiimaha dhimista: ~ 30% (marka la barbar dhigo habaynta ololka sare);
• Haysashada xoogga xajinta: ≥80% (APP waxay u baahan tahay koobab si looga hortago hydrolysis).

Habka Furaha:

• APP waa in ay ahaataa mid yar oo kaabsulaysan (tusaale, leh melamine-formaldehyde resin) si looga fogaado nuugista qoyaanka iyo samaynta xumbo;
• Ku dar 1-2 phr hydrophobic silica fumed (tusaale, Aerosil R202) dejinta lidka ku ah.

3. Samaynta Habka Fudud ee Muuqa-hooseeya (Si sax ah isku xidhka elektiroonigga, u baahan socodka sare)

Isku darka Ololka Muhiimka ah:

• Aluminium hypophosphite (AHP): 5-8 phr (nanosized, D50 ≤1 μm);
• Dib u dhiga holaca fosfooraska dabiiciga ah ee dareeraha ah (BDP): 8-10 phr (tusaale.
• Aluminium hydroxide (ATH): 15 phr (aluminium aluminium ah oo isku dhafan, dheellitirka kuleylka);
• MCA: 3-5 phr.

Waxqabadka la filayo:

• Kala duwanaanshaha viscosity: 10,000-15,000 cP (ku dhow nidaamyada dab-demiska dareeraha);
• Dib u dhigista ololka: UL94 V-0 (oo lagu xoojiyay fosfooraska dareeraha ah);
• Dhaqdhaqaaqa kulaylka: ≥0.6 W/m · K (oo ay ku biirisay alumina wareegsan).

Habka Furaha:

• AHP iyo alumina wareegsan waa in la isku daraa oo lagu kala firdhiyaa xiirid sare (≥2000 rpm);
• Ku dar 4-6 phr shaandho shaandho molikula ah qaybta B si aad uga hortagto nuugista qoyaanka AHP.

4. Qodobbada Farsamo ee Isku-dhafka ah & xalalka Beddelka ah

1. Hababka isku dhafan:

• AHP + MCA:AHP waxay kor u qaadaa fuuq-baxa iyo qulqulaya, halka MCA ay sii deyso gaasta nitrogen marka ay kululeyso, samaynta lakabka dhuxul ee u eg.
• ATH + Zinc borate:ATH waxay nuugtaa kulaylka (1967 J/g), iyo borate zinc waxay samaysaa lakab dhalo ah si ay u daboosho dusha sare.

2. Dib-u-dhigeyaasha Ololka Kale:

• Kala soocida Polyphosphazene:Waxtarka-sare iyo deegaanka-saaxiibtinimo, oo leh ka faa'iidaysiga HCl-soo-saarka;
• Xabagta silikoon (ESR):Marka lagu daro AHP, waxay yaraynaysaa wadarta rarka (18% ee V-0) waxayna hagaajinaysaa sifooyinka farsamada.

3. Habka Xakamaynta Khatarta:

• Sedimentation:Waxyaalaha ka-hortagga dejinta (tusaale, noocyada polyurea-la beddelay) ayaa loo baahan yahay haddii viscosity <10,000 cP;
• Kahortagga daaweynta:Iska ilaali dib-u-kicinta ololka alkaline ee xad-dhaafka ah (tusaale, MCA) si aad uga hortagto faragelinta falcelinta isocyanate.

5. Talooyinka Dhaqangelinta

• Mudnaanta sii tijaabinta qaabaynta ololka sare: dahaaran AHP + submicron ATH (celcelis ahaan cabbirka walxaha 0.5 μm) ee AHP:ATH:MCA = 10:20:5 hagaajinta bilowga ah.
• Tijaabooyin muhiim ah:
  → LOI (GB/T 2406.2) iyo UL94 gubasho toosan;
  → Xoogga dammaanadda ka dib baaskiilka kulaylka (-30 ℃ ~ 100 ℃, 200 saacadood);
  → Roobab dib u dhiga ololka kadib da'da la dedejiyey (60 ℃/7d).

Shaxda Samaynta Ololka Retardant