Polyurethane AB Adhesive Powder Flame Retardant Formulations

Polyurethane AB Adhesive Powder Flame Retardant Formulations
Ho ipapisitsoe le tlhoko ea li-halogen-free flame retardant formulations bakeng sa likhomaretsi tsa polyurethane AB, tse kopantsoeng le litšobotsi le litlamorao tsa li-flame retardants joalo ka aluminium hypophosphite (AHP), aluminium hydroxide (ATH), zinc borate, le melamine cyanrate (MCA), maano a mararo a latelang a entsoe. Metsoako ena ha e na chlorine 'me e tsepamisitse maikutlo ho ntlafatseng ts'ebetso e thibelang malakabe, ho tsamaellana le ts'ebetso ea 'mele, le bokhoni ba ts'ebetso:

1. Sebopeho sa High Flame Retardancy (Bakeng sa pitsa ea elektroniki, encapsulation ea betri, target UL94 V-0)

Motsoako oa Core Flame Retardant:

• Aluminium hypophosphite (AHP): 8-12 phr (mofuta o koahetsoeng ka metsi oa polyurethane o khothalelitsoeng ho rarolla mathata a pula)
• Aluminium hydroxide (ATH): 20-25 phr (submicron grade, 0.2-1.0 μm, ho matlafatsa index ea oksijene le char compactness)
• MCA: 5-8 phr (mochine oa khase-mohato, synergistic le AHP mokhahlelong o khutsufalitsoeng)
• Zinc borate: 3-5 phr (e khothalletsa sebopeho sa char ea ceramic le ho thibela ho tsuba)

Ts'ebetso e Lebeletsoeng:

• Index ea oksijene (LOI): ≥32% (PU e hloekileng ≈22%);
• UL94 tekanyo: V-0 (1.6 limilimithara botenya);
• Thermal conductivity: 0.45-0.55 W/m·K (e fanoeng ke ATH le zinc borate);
• Taolo ea viscosity: 25,000-30,000 cP (phekolo ea holim'a metsi e hlokahalang ho thibela sedimentation).

Mokhoa oa bohlokoa:

• AHP e tlameha ho hasanngoa pele ho karolo ea polyol (Karolo ea A) ho qoba ho itšoara pele ho nako ka isocyanate (Karolo ea B);
• ATH e lokela ho fetoloa ka sesebelisoa se kopanyang silane (mohlala, KH-550) ho matlafatsa maqhama a sefahleho.

2. Thekiso e Akaretsang ea Theko e Tlase (Bakeng sa ho tiisa kaho, ho tlama thepa ea ka tlung, sepheo sa UL94 V-1)

Motsoako oa Core Flame Retardant:

• Aluminium hydroxide (ATH): 30-40 phr (e tloaelehileng ea micron-grade, e theko e tlaase, e thibelang lelakabe la mofuta oa filler);
• Ammonium polyphosphate (APP): 10-15 phr (e kopantsoe le MCA bakeng sa tsamaiso ea intumescent, ho nkela li-halogenated agents sebaka);
• MCA: 5-7 phr (karolelano ho APP 1: 2 ~ 1: 3, e khothalletsa ho phunya le ho itšehla thajana ha oksijene);
• Zinc borate: 5 phr (khatello ea mosi, sebopeho sa char e thusang).

Ts'ebetso e Lebeletsoeng:

• LOI: ≥28%;
• UL94 tekanyo: V-1;
• Phokotso ea litšenyehelo: ~ 30% (ha e bapisoa le sebopeho se phahameng sa mollo-retardancy);
• Ho boloka matla a thata: ≥80% (APP e hloka encapsulation ho thibela hydrolysis).

Mokhoa oa bohlokoa:

• APP e tlameha ho ba le microencapsulated (mohlala, ka resin ea melamine-formaldehyde) ho qoba ho monya mongobo le ho etsa lipululana;
• Kenya 1-2 phr hydrophobic fumed silica (mohlala, Aerosil R202) bakeng sa anti-setting.

3. Low-Viscosity Easy-Process Formulation (Bakeng sa bonding e nepahetseng ea elektronike, e hlokang phallo e phahameng)

Motsoako oa Core Flame Retardant:

• Aluminium hypophosphite (AHP): 5-8 phr (nanosized, D50 ≤1 μm);
• Liquid organic phosphorus flame retardant (BDP e 'ngoe): 8-10 phr (mohlala, li-derivatives tsa DMMP tse se nang phosphorus-based, ho boloka viscosity);
• Aluminium hydroxide (ATH): 15 phr (spherical alumina composite, bancing conductivity thermal conductivity);
• MCA: 3-5 phr.

Ts'ebetso e Lebeletsoeng:

• Sebaka sa viscosity: 10,000-15,000 cP (haufi le mekhoa e thibelang mollo oa metsi);
• Ho fokotsa lelakabe: UL94 V-0 (e matlafalitsoe ke phosphorus ea metsi);
• Thermal conductivity: ≥0.6 W/m·K (e kentsoe ke spherical alumina).

Mokhoa oa bohlokoa:

• AHP le alumina e chitja li tlameha ho kopanngoa le ho qhalakanngoa ka tlas'a ho kuta e phahameng (≥2000 rpm);
• Kenya 4-6 phr molecular sieve desiccant ho Karolo ea B ho thibela ho kenngoa ha mongobo oa AHP.

4. Ho Kopanya Lintlha tsa Teknoloji le Litharollo tse ling

1. Mekhoa ea Synergistic:

• AHP + MCA:AHP e khothalletsa ho felloa ke metsi 'meleng le ho chesa, ha MCA e ntša khase ea naetrojene ha e futhumatsa, e etsa lehe la linotši le kang la char.
• ATH + Zinc borate:ATH e monya mocheso (1967 J/g), 'me zinki borate e etsa lera la khalase ea borate ho koahela bokaholimo.

2. Li-Alternative Flame Retardants:

• Lintho tse tsoang ho polyphosphazene:E sebetsang hantle haholo le eco-friendly, e nang le ts'ebeliso ea lihlahisoa tsa HCl;
• Epoxy silicone resin (ESR):Ha e kopantsoe le AHP, e fokotsa phallo e felletseng (18% bakeng sa V-0) mme e ntlafatsa thepa ea mochini.

3. Taolo ea Kotsi ea Ts'ebetso:

• Sedimentation:Li-anti-settlement agents (mohlala, mefuta ea polyurea-modified) e hlokahalang haeba viscosity <10,000 cP;
• Thibelo ea ho folisa:Qoba lintho tse thibelang malakabe a alkaline (mohlala, MCA) ho thibela ho kena-kenana le maikutlo a isocyanate.

5. Litlhahiso tsa Phethahatso

• Etelletsa pele ho hlahloba sebopeho se phahameng sa mollo-retardancy: e koahetsoeng ke AHP + submicron ATH (karolelano ea boholo ba likaroloana 0.5 μm) ho AHP: ATH: MCA = 10:20:5 bakeng sa ho ntlafatsa qalong.
• Liteko tsa bohlokoa:
  → LOI (GB/T 2406.2) le UL94 ho chesa ka holimo;
  → Matla a bond ka mor'a ho palama baesekele e futhumetseng (-30 ℃ ~ 100 ℃, lihora tse 200);
  → Pula e khutlisang lelakabe ka mor'a botsofali bo potlakileng (60℃/7d).

Lelakabe la Tlhahiso ea Lelakabe la Retardant