PBT Halogen-Free Flame Retardant Reference Formulation

PBT Halogen-Free Flame Retardant Reference Formulation

Txhawm rau txhim kho cov qauv ntawm halogen-dawb nplaim retardants rau PBT, nws yog ib qho tseem ceeb rau kev sib npaug ntawm cov nplaim hluav taws xob ua kom zoo, thermal stability, kev ua haujlwm kub, thiab cov khoom siv kho tshuab. Hauv qab no yog lub tswv yim optimized compounding nrog cov kev ntsuam xyuas tseem ceeb:

1. Core Flame Retardant Combinations

Kev xaiv 1: Aluminium Hypophosphite + MCA (Melamine Cyanurate) + Zinc Borate

Mechanism:

• Aluminium Hypophosphite (Thermal stability> 300 ° C): Txhawb char tsim nyob rau hauv lub condensed theem thiab tso tawm PO· radicals nyob rau hauv lub roj theem los cuam tshuam combustion chain reactions.
• MCA (Decomposition ntawm ~ 300 ° C): Endothermic decomposition tso tawm inert gases (NH₃, H₂O), diluting flammable gases thiab suppressing yaj dripping.
• Zinc Borate (Decomposition> 300 ° C): Txhim kho cov iav char tsim, txo cov pa taws thiab tom qab ci.

Pom zoo Ratio:

• Aluminium Hypophosphite (10-15%) + MCA (5-8%) + Zinc Borate (3-5%).

Kev xaiv 2: Nto-Modified Magnesium Hydroxide + Aluminium Hypophosphite + Organic Phosphinate (xws li, ADP)

Mechanism:

• Hloov kho Magnesium Hydroxide (Decomposition ~ 300 ° C): Kev kho deg (silane / titanate) txhim kho kev tawg thiab thermal stability; endothermic cooling txo cov khoom kub.
• Organic Phosphinate (piv txwv li, ADP, thermal stability> 300 ° C): Cov pa roj-theem nplaim hluav taws zoo heev, ua haujlwm nrog phosphorus-nitrogen systems.

Pom zoo Ratio:

• Magnesium Hydroxide (15-20%) + Aluminium Hypophosphite (8-12%) + ADP (5-8%).

2. Yeem Synergists

• Nano-av nplaum / Talc (2-3%): Txhim kho char zoo thiab cov khoom siv kho tshuab thaum txo cov nplaim hluav taws kub.
• PTFE (0.2-0.5%): Anti-dripping tus neeg saib xyuas kom tsis txhob kub hnyiab.
• Silicone hmoov (2-4%): Txhawb kev them tus nqi, txhim kho cov nplaim hluav taws retardancy thiab ci ci.

3. Kev sib xyaw kom zam

• Aluminium Hydroxide: Decomposes ntawm 180-200 ° C (hauv qab PBT ua qhov kub thiab txias ntawm 220-250 ° C), ua rau degradation ntxov ntxov.
• Unmodified Magnesium Hydroxide: Yuav tsum tau kho saum npoo los tiv thaiv agglomeration thiab thermal decomposition thaum ua.

4. Cov lus qhia ua kom zoo tshaj plaws

• Kev Kho Hniav: Siv cov tshuaj silane coupling ntawm Mg(OH)₂ thiab zinc borate los txhim kho kev sib cais thiab kev sib txuas ntawm lub ntsej muag.
• Kev Tswjhwm Kub Kub: Ua kom cov nplaim hluav taws kub hnyiab kub> 250 ° C kom tsis txhob degradation.
• Mechanical Property Balance: Txhawb kom lub zog poob siv nano-fillers (piv txwv li, SiO₂) lossis tougheners (piv txwv li, POE-g-MAH).

5. Piv txwv Formulation

6. Kev ntsuas qhov tseem ceeb

• Nplaim Retardancy: UL94 V-0 (1.6mm), LOI > 35%.
• Thermal Stability: TGA residue> 25% (600 ° C).
• Mechanical Properties: Tensile zog> 45 MPa, tsis muaj kev cuam tshuam> 4 kJ / m².

Los ntawm kev kho qhov sib piv, kev ua haujlwm siab halogen-dawb nplaim retardancy tuaj yeem ua tiav thaum tuav PBT qhov kev ua tau zoo tag nrho.

More info., pls send email to lucy@taifeng-fr.com