Phosphinate Flame Retardant for Polyester Injection Molding Applications

PHOSPHINATE FLAME RETARDANT FOR POLYESTER INJECTION MOLDING APPLICATIONS-Aluminium Hypophosphite (Al (H2 PO2 )3,It is an inorganic phosphorus based flame retardant developed specifically for polyester injection molding, with a phosphorus content of ≥ 30% and a thermal decomposition temperature of ≥ 280 ℃. It has the characteristics of good compatibility with polyester resin, stable high-temperature processing, and minimal impact on injection molding process. It achieves efficient flame retardancy in polyester materials such as PET and PBT through a dual mechanism of gas-phase flame retardancy and condensed phase carbonization, while maintaining product transparency and mechanical strength. It meets standards such as UL94 and GB/T 2408 and is an ideal choice to replace traditional bromine based flame retardants.Shandong taixing produce two type PHOSPHINATE FLAME RETARDANT FOR POLYESTER INJECTION MOLDING APPLICATIONS : Aluminium Hypophosphite ( Low Sulfate Content,aht-220B ) and regular Aluminium Hypophosphite ( HT-220A) two type Aluminium Hypophosphite (Al (H2 PO2 )3.

Product Introduction:

1. Three core advantages of adapting to polyester injection molding

(1) High temperature stability, compatible with injection molding process

Processing temperature resistance: Initial decomposition temperature ≥ 280 ℃, higher than the commonly used temperature for polyester injection molding (PET: 240-280 ℃; PBT: 220-260 ℃), to avoid premature decomposition and the production of bubbles or degradation products during processing, ensuring the surface smoothness of the product (glossiness ≥ 85GU);

Long term heat resistance: After injection molding, the product can be used for a long time at 150 ℃, with a flame retardant performance retention rate of ≥ 95%, suitable for polyester components that require high temperature resistance.

(2) High dispersibility ensures product uniformity

Nanoscale particle size: D50=2-5 μ m, surface modified with stearic acid, uniformly dispersed in polyester melt without agglomeration, avoiding "zebra stripes" or uneven mechanical properties in injection molded parts;

Low viscosity effect: Adding 10-15% aluminum hypophosphite to polyester melt reduces the melt index (MFR) by ≤ 12% (better than the 25% reduction of traditional flame retardant aluminum hydroxide), making it suitable for precision injection molding of complex structural parts.

(3) Dual balance of flame retardancy and mechanical properties

Efficient flame retardant: Adding 12-18% can achieve UL94 V-0 flame retardant grade (1.6mm thickness) for polyester, increase oxygen index (OI) to over 32%, and produce no droplets or only self extinguishing droplets during combustion;

Mechanical performance maintenance: The tensile strength of injection molded products is ≥ 75MPa (about 10% lower than pure polyester), the bending modulus is ≥ 2000MPa, and the impact strength is ≥ 8kJ/m ², meeting the mechanical requirements of structural components.

2. Dual flame retardant mechanism to enhance safety performance

Gas phase flame retardant: releases phosphorus containing active groups (such as H ₂ PO ₂ ·) at high temperatures, captures H · and OH · radicals generated by polyester combustion, inhibits combustion chain reactions, and reduces peak heat release rate by more than 40%;

Condensed phase flame retardant: forms a continuous and dense carbonized layer, with a thickness increased by 30% compared to before addition, effectively blocking oxygen and heat transfer, reducing combustion duration (reducing total heat release by 50%).

Physical and Chemical Properties

Key Advantage

High TGA: TGA(1%) ≥310℃

High Stable Quality:Purity mainly stable in 96.0%-97.5%

Application areas:

1. Electronic and electrical injection molded parts

PET connector: used for mobile phone chargers and computer motherboard interfaces. After adding 10-12% aluminum hypophosphite, it has passed UL94 V-0 certification and meets CTI (Leakage Traceability Index) ≥ 600V, with excellent arc resistance performance;

PBT relay housing: suitable for automotive relays, industrial control modules, heat-resistant wire test (GWIT ≥ 775 ℃), long-term resistance to high temperature environment of 125 ℃.

2. Automotive components

PET engine hood components: such as air filter housing, added with 15% aluminum hypophosphite, passed FMVSS 302 flame retardant test (combustion rate ≤ 50mm/min), resistant to engine oil corrosion (SAE 10W-40 soaking for 72 hours, performance retention rate ≥ 95%);

PBT automotive electronic casing: used for car camera modules and sensor housings, with both flame retardancy and impact resistance (simply supported beam impact strength ≥ 15kJ/m ²).

3. Home and consumer goods

PET transparent flame-retardant containers: such as microwave lunch boxes, with a light transmittance of ≥ 80% after adding 8-10% aluminum hypophosphite, in compliance with GB 4806.7 (food contact material standard), and a flame-retardant rating of GB/T 2408 V-2;

PBT furniture hardware: such as flame-retardant drawer rails and wardrobe connectors, certified by GB/T 8624 B1 level, with a mechanical performance retention rate of ≥ 90% after weather resistance (UV aging for 500 hours).

Packaging :Net weight 25kg/bag, Compound paper-plastic bag and inner aluminum foil

Storage and Attention: Keep in dry, room temperature and moisture proof condition, preventing the heating.

Welcome to order

Choose aluminum hypophosphite to inject the core competitiveness of "flame retardant, stable, and efficient" into polyester injection molding! Help your product quickly pass certification and enhance market competitiveness.

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