PBT Halogen-Free Flame Retardant Formulation

PBT Halogen-Free Flame Retardant Formulation

Txhawm rau txhim kho cov nplaim hluav taws xob tsis muaj hluav taws xob halogen (FR) rau PBT, nws yog qhov tseem ceeb rau kev sib npaug ntawm cov nplaim hluav taws xob ua haujlwm, thermal stability, kev ua haujlwm kub, thiab cov khoom siv tshuab.

I. Core Flame Retardant Combinations

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 temp. ~ 300 ° C): Endothermic decomposition tso tawm inert gases (NH₃, H₂O), diluting flammable gases thiab suppressing yaj dripping.
• Zinc Borate (Decomposition temp.> 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%).

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

Mechanism:

• Hloov kho Magnesium Hydroxide (Decomposition temp. ~ 300 ° C): Kev kho deg (silane / titanate) txhim kho kev tawg thiab thermal stability thaum nqus cua sov kom txo cov khoom kub.
• Organic Phosphinate (piv txwv li, ADP, Thermal stability> 300 ° C): Cov pa roj-theem nplaim hluav taws muaj txiaj ntsig zoo, ua haujlwm nrog phosphorus-nitrogen systems.

Pom zoo Ratio:
Magnesium Hydroxide (15-20%) + Aluminium Hypophosphite (8-12%) + ADP (5-8%).

II. Optional Synergists

• Nano Clay / Talc (2-3%): Txhim kho char zoo thiab txhua yam khoom thaum txo FR ntau npaum.
• PTFE (Polytetrafluoroethylene, 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.

III. Kev sib xyaw kom zam

• Aluminium Hydroxide: Decomposes ntawm 180-200 ° C (hauv qab PBT ua temp. 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.

IV. Cov lus pom zoo rau kev ua tau zoo

1. Kev Kho Hniav: Siv silane coupling cov neeg ua haujlwm ntawm magnesium hydroxide thiab zinc borate los txhim kho kev sib cais thiab kev sib txuas ntawm lub ntsej muag.
2. Kev Tswj Kub Kub: Ua kom FR decomposition kub> 250 ° C kom tsis txhob degradation thaum ua.
3. Mechanical Property Balance: Incorporate nano-fillers (piv txwv li, SiO₂) los yog tougheners (piv txwv li, POE-g-MAH) los them rau lub zog poob.

V. Hom qauv qauv piv txwv

VI. Cov Kev Ntsuas 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 ua kom zoo dua qhov sib piv, qhov ua tau zoo halogen-dawb nplaim hluav taws xob tuaj yeem ua tiav thaum tswj PBT qhov kev ua tau zoo tag nrho.

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