Highly Stable Phosphinate Based Flame Retardant for TPU

Highly stable phosphinate based flame retardant for TPU--Aluminium Hypophosphite (Al (H2 PO2 )3 is kind of new type phosphorus flame retardant, slightly soluble in water, high purity and high decomposition temperature,Highly stable phosphinate based flame retardant for TPU-Aluminium Hypophosphite (Al (H2 PO2 )3 is widely used in engineering plastics, wire and cable compounds.It has the characteristics of excellent compatibility with TPU, high flame retardant efficiency, and minimal impact on elastic properties. It achieves efficient flame retardancy through a dual mechanism of gas-phase flame retardancy and condensed phase carbonization, without significantly reducing the elongation at break of TPU. At the same time, it meets environmental standards such as REACH and GB 31604, making it an ideal choice to replace traditional halogenated flame retardants.Shandong taixing produce two type Highly stable phosphinate based flame retardant for TPU: Aluminium Hypophosphite ( Low Sulfate Content,aht-220B ) and regular Aluminium Hypophosphite ( HT-220A) two type Aluminium Hypophosphite (Al (H2 PO2 )3.

Product Introduction:

1. Flexible flame retardant, compatible with TPU elastic properties

Aluminum hypophosphite achieves "flame retardant and non brittle" properties for TPU, which is prone to combustion and melt dripping

Gas phase flame retardant synergy: releases phosphate ester active ingredients at high temperatures, captures free radicals (such as H ·) generated by TPU combustion, interrupts the combustion chain reaction, and reduces the combustion rate (the combustion rate can be reduced from 150mm/min for pure TPU to below 50mm/min);

Lightweight carbon layer construction: forming a porous and fluffy carbonized layer, blocking heat and oxygen transfer while avoiding the hardening problem of TPU caused by traditional flame retardants (adding 10% aluminum hypophosphite to TPU increases Shore hardness by ≤ 5HA);

Smoke suppression and anti dripping: Reduce smoke release during combustion (smoke density level SDR ≤ 70), and fix the melt with a carbon layer to suppress the risk of dripping (reduce dripping frequency by 75%).

2. Low addition and high compatibility, retaining TPU core performance

Dispersion optimization: After surface treatment with silane coupling agent, it is uniformly dispersed in TPU polyester/polyether polyol, and does not affect transparency during melt processing (transmittance ≥ 85%), suitable for blown film, casting and other processes;

Elastic retention rate: TPU composite material with 8-12% aluminum hypophosphite added, fracture elongation ≥ 400% (reduced by about 15% compared to pure TPU, better than the 30% reduction of traditional flame retardant magnesium hydroxide), tensile strength ≥ 30MPa, meeting the requirements of elastic deformation;

Hydrolysis resistance: After being stored in an environment with humidity ≥ 90% for 6 months, the flame retardant performance retention rate is ≥ 95%, suitable for outdoor and humid environments.

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. Shoe materials and sports equipment

Flame retardant sports sole: TPU sole with 8-10% aluminum hypophosphite added, passed GB/T 20991 (flame retardant test for leather shoes), with a 20% increase in wear resistance (abrasion length ≤ 10mm), while maintaining sole softness (Shore A hardness ≤ 90HA);

Outdoor equipment accessories: hiking bag shoulder straps, ski boot lining, meeting EN 344 (outdoor equipment flame retardant standard), with both flame retardancy and resistance to low-temperature embrittlement (elongation at break at -30 ℃ ≥ 350%).

2. Wires, cables, and pipes

Flame retardant TPU cable sheath: used for robot cables and automotive wiring harnesses. After adding 12% aluminum hypophosphite, the oxygen index (OI) reaches 30%. It has passed the UL1581 vertical combustion test and has excellent oil resistance (resistant to ASTM No.3 oil immersion for 24 hours with a volume change of ≤ 5%);

Flexible flame retardant hose: industrial oil hose, medical breathing tube, in compliance with ISO 10993 (Medical Materials Standard), with a flame retardant rating of GB/T 2408 V-2.

3. Automotive and Industrial Parts

Automotive interior parts: steering wheel wrapped in TPU, seat belt cover, passed FMVSS 302 flame retardant test, combustion rate ≤ 70mm/min, and resistant to ultraviolet aging (QUV test 500h color difference Δ E ≤ 3);

Industrial conveyor belt: logistics sorting machine conveyor belt, food processing equipment belt, flame retardant grade reaches GB/T 10801.2 B1 level, tear resistance strength ≥ 40kN/m.

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

Choosing aluminum hypophosphite injects the core advantages of "flame retardancy, flexibility, and environmental friendliness" into TPU elastomers! Help your product overcome performance bottlenecks.

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