Kev siv hluav taws kub retardant formulation rau SK Polyester ES500 (UL94 V0 ntsuam xyuas).

Kev siv hluav taws kub retardant formulation rau SK Polyester ES500 (UL94 V0 ntsuam xyuas).

I. Formulation Design Approach

1. Substrate Compatibility
   • SK Polyester ES500: Ib qho thermoplastic polyester nrog kev ua haujlwm kub ntawm 220-260 ° C. Cov nplaim hluav taws yuav tsum tiv taus qhov kub thiab txias.
   • Cov Lus Qhia Tseem Ceeb: Cov nplaim hluav taws kub sib npaug (V0), cov khoom siv hluav taws xob (tensile / cuam tshuam lub zog), thiab kev ua haujlwm fluidity.
2. Synergistic nplaim retardant System
   • Ultrafine Aluminium Hydroxide (ATH): Cov nplaim hluav taws kub hnyiab, kev ua kom lub cev qhuav dej. Kev thauj khoom yuav tsum sib npaug ntawm cov nplaim hluav taws xob thiab cov khoom siv kho tshuab.
   • Aluminium Hypophosphite: Char-forming synergist, ua haujlwm nrog ATH los tsim cov phosphorus-aluminium synergistic nyhuv, txhim kho char zoo.
   • Zinc Borate: Char enhancer, suppresses pa luam yeeb, thiab ua ib tug tuab barrier nrog ATH.
   • MCA (Melamine Cyanurate): Gas-theem nplaim hluav taws, dilutes oxygen thiab inhibits yaj dripping.

II. Pom zoo Formulation (Weight Percentage)

III. Cov Txheej Txheem Tseem Ceeb

1. Dispersion Optimization
   • Kev kho ua ntej: Soak ATH thiab aluminium hypophosphite hauv 1% KH-550 ethanol tov rau 2 teev, ces qhuav ntawm 80 ° C.
   • Mixing Sequence:
     1. Base resin + dispersant + coupling tus neeg sawv cev → Tsawg-ceev sib tov (500 rpm, 5 min).
     2. Ntxiv hloov kho ATH / aluminium hypophosphite → High-speed shear (2500 rpm, 20 min).
     3. Ntxiv zinc borate / MCA / PTFE → Tsawg-ceev sib tov (800 rpm, 10 min).
   • Khoom siv: Twin-ntsia hlau extruder (kub aav: pub zone 200 ° C, melting zone 230 ° C, tuag 220 ° C).
2. Kev tswj qhov kub thiab txias
   • Xyuas kom lub melt kub <250 ° C los tiv thaiv MCA decomposition (MCA decomposes ntawm 250-300 ° C).
   • Dej-txias pellets tom qab extrusion los tiv thaiv cov nplaim taws retardant tsiv teb tsaws.

IV. Nplaim Retardant Synergistic Mechanism

1. ATH + Aluminium Hypophosphite
   • ATH absorbs cua sov thiab tso dej vapor, diluting flammable gases.
   • Aluminium hypophosphite catalyzes ntom char tsim (AlPO₄), thaiv cov cua sov hloov.
2. Zinc Borate + MCA
   • Zinc borate tsim ib qho thaiv iav hla cov kab nrib pleb.
   • MCA decomposes tso NH₃, diluting oxygen thiab inhibiting dawb radical tshua.
3. PTFE Anti-Dripping
   • PTFE micropowder tsim ib lub network fibrous, txo cov yaj-drip ignition pheej hmoo.

V. Performance Tuning & Troubleshooting

VI. Validation Metrics

1. UL94 V0 Test:
   • 1.6 hli thiab 3.2 hli cov qauv, tag nrho lub sij hawm hlawv <50 sec tom qab ob ignitions, tsis muaj dripping ignition.
2. LOI: Lub Hom Phiaj ≥30% (qhov tseeb ≥28%).
3. Mechanical Properties:
   • Tensile zog> 40 MPa, cuam tshuam lub zog> 5 kJ / m² (ASTM tus qauv).
4. Thermal Stability (TGA):
   • Char residue ntawm 800 ° C > 20%, pib decomposition kub > 300 ° C.

VII. Piv txwv Reference Formulation

Qhov kev tsim thiab txheej txheem tsim tau zoo ua tiav UL94 V0 nplaim hluav taws xob rau SK Polyester ES500 thaum ntsuas kev ua tau zoo thiab cov khoom siv kho tshuab. Cov kev sim me me raug pom zoo kom txheeb xyuas qhov sib txawv ua ntej qhov kev sib tw zoo (xws li, ntsuas aluminium hypophosphite thiab MCA). Txhawm rau txhim kho cov nplaim hluav taws xob ntxiv, xav txog ntxiv 2% boron nitride nanosheets (BNNS) ua ob txoj haujlwm thermal conductive / nplaim retardant muab tub lim.

More info., pls contact lucy@taifeng-fr.com