Polyurethane AB Adhesive Powder Flame Retardant Formulations

Polyurethane AB Adhesive Powder Flame Retardant Formulations
Dabere na ọchịchọ maka usoro ire ere ọkụ na-enweghị halogen maka polyurethane AB adhesives, jikọtara ya na njirimara na mmetụta synergistic nke ndị na-ere ọkụ dị ka aluminom hypophosphite (AHP), aluminum hydroxide (ATH), zinc borate, na melamine cyanurate (MCA), a na-emepụta atụmatụ atọ ndị a. Usoro ndị a enweghị chlorine ma na-elekwasị anya n'ịkwalite arụmọrụ ire ọkụ, ndakọrịta arụ ọrụ anụ ahụ, yana ike usoro:

1. Ụdị Nkwụghachi ọkụ dị elu (Maka ite ọkụ eletrik, mkpuchi batrị, UL94 V-0 lekwasịrị anya)

Ngwakọta isi ire ọkụ:

• Aluminom hypophosphite (AHP): 8-12 phr (ụdị mkpuchi polyurethane nke mmiri na-atụ aro iji dozie nsogbu mmiri ozuzo)
• Aluminom hydroxide (ATH): 20-25 phr (submicron ọkwa, 0.2-1.0 μm, iji welie oxygen index na char compactness)
• MCA: 5-8 phr (usoro gas-phase, synergistic na AHP na oge condensed)
• Zinc borate: 3-5 phr (na-akwalite nhazi chaja seramiiki ma na-egbochi anwụrụ ọkụ)

Arụmọrụ a tụrụ anya ya:

• Oxygen index (LOI): ≥32% (PU dị ọcha ≈22%);
• UL94 ọkwa: V-0 (1.6 mm ọkpụrụkpụ);
• Igwe ọkụ ọkụ: 0.45-0.55 W / m · K (nke ATH na zinc borate nyere);
• Njikwa viscosity: 25,000-30,000 cP (ọgwụgwọ n'elu chọrọ iji gbochie sedimentation).

Usoro igodo:

• AHP ga-ebu ụzọ gbasasịa na mpaghara polyol (akụkụ A) iji zere mmeghachi omume akaghi aka na isocyanate (Nkebi B);
• Ekwesịrị iji onye na-ahụ maka njikọta silane gbanwee ATH (dịka ọmụmaatụ, KH-550) iji kwalite njikọta ihu.

2. Mpempe akwụkwọ General dị ala (N'ihi na mkpuchi ihe owuwu, njikọta arịa ụlọ, ebumnuche UL94 V-1)

Ngwakọta isi ire ọkụ:

• Aluminom hydroxide (ATH): 30-40 phr (ọkọlọtọ micron-ọkọlọtọ, ọnụ ahịa dị ọnụ ahịa, ihe nkpuchi ọkụ ọkụ na-eme ka ọ bụrụ ụdị ọkụ);
• Ammonium polyphosphate (APP): 10-15 phr (jikọtara na MCA maka usoro intumescent, na-edochi ndị ọrụ halogenated);
• MCA: 5-7 phr (ratio na APP 1: 2 ~ 1: 3, na-akwalite ụfụfụ na ikuku oxygen);
• Zinc borate: 5 phr (mbelata anwụrụ ọkụ, nhazi cha cha inyeaka).

Arụmọrụ a tụrụ anya ya:

• LOI: ≥28%;
• UL94 ọkwa: V-1;
• Mbelata ọnụ ahịa: ~ 30% (ma e jiri ya tụnyere nhazi ọkụ ọkụ dị elu);
• Njide ike nkwụsị: ≥80% (APP chọrọ encapsulation iji gbochie hydrolysis).

Usoro igodo:

• APP ga-abụrịrị microencapsulated (dịka ọmụmaatụ, ya na resin melamine-formaldehyde) iji zere mmịkọ mmiri na imepụta afụ;
• Tinye 1-2 phr hydrophobic fumed silica (dịka, Aerosil R202) maka mgbochi idozi.

3. Ọdịdị dị mfe nke obere viscosity (N'ihi na nkenke electronics bonding, na-achọ elu flowability)

Ngwakọta isi ire ọkụ:

• Aluminium hypophosphite (AHP): 5-8 phr (nanosized, D50 ≤1 μm);
• Liquid organic phosphorus flame retardant (BDP ọzọ): 8-10 phr (dịka ọmụmaatụ, DMMP sitere na phosphorus na-enweghị halogen, na-ejigide viscosity);
• Aluminom hydroxide (ATH): 15 phr (spherical alumina composite, na-edozi conductivity thermal);
• MCA: 3-5 phr.

Arụmọrụ a tụrụ anya ya:

• Ogologo viscosity: 10,000-15,000 cP (nke dị nso na sistemụ ire ọkụ ọkụ);
• Nkwụsị ọkụ: UL94 V-0 (nke mmiri mmiri phosphorus kwalitere);
• Igwe ọkụ ọkụ: ≥0.6 W / m · K (nke alumina na-enye aka).

Usoro igodo:

• AHP na sppherical alumina ga-ejikọta ya na gbasasịa n'okpuru akwa shiee (≥2000 rpm);
• Tinye 4-6 phr molecular sieve desiccant na Nkebi B iji gbochie mmịpụta mmiri AHP.

4. Ngwakọta Isi Nka na ụzụ & Ngwọta Nhọrọ

1. Usoro mmekọrịta:

• AHP + MCA:AHP na-akwalite akpịrị ịkpọ nkụ na ịcha ọkụ, ebe MCA na-ewepụta gas nitrogen n'elu ikpo ọkụ, na-akpụ oyi akwa dị ka chara acha.
• ATH + Zinc borate:ATH na-amịkọrọ okpomọkụ (1967 J / g), na zinc borate na-emepụta akwa iko borate iji kpuchie elu.

2. Ndị ọzọ ire ọkụ:

• Mwepụta nke polyphosphazene:Ịrụ ọrụ dị elu na ebe obibi enyi na enyi, yana iji HCl na-emepụta ihe;
• Epoxy silicone resin (ESR):Mgbe ejikọtara ya na AHP, ọ na-ebelata mkpokọta loading (18% maka V-0) na mma n'ibu Njirimara.

3. Usoro njikwa ihe egwu:

• Mgbaze:Ndị na-egbochi nkwụsị (dịka ọmụmaatụ, ụdị mgbanwe polyurea) chọrọ ma ọ bụrụ na viscosity <10,000 cP;
• Mgbochi ọgwụgwọ:Zenarị ihe ndị na-egbochi ire ọkụ alkaline gabigara ókè (dịka, MCA) iji gbochie ndabichi na mmeghachi omume isocyanate.

5. Ndụmọdụ mmejuputa iwu

• Wepụta ụzọ ịnwale usoro nkwụghachi ọkụ dị elu: AHP + submicron ATH mkpuchi (nkezi nha 0.5 μm) na AHP:ATH:MCA = 10:20:5 maka njikarịcha mbụ.
• Nnwale isi:
  → LOI (GB/T 2406.2) na UL94 vetikal ọkụ;
  → ike nkekọ mgbe ịnya igwe na-ekpo ọkụ (-30 ℃ ~ 100 ℃, awa 200);
  → Ọdịda na-ebelata ire ọkụ ka emechara ịka nká (60 ℃/7d).

Tebụl nhazi ire ọkụ