Flame-Retardant Polyamide Composition with Phosphazene Synergy
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Solution Overview
Problem
Halogen-free polyamide compositions face challenges in achieving high thermal stability, meeting glow wire requirements, and maintaining mechanical and electrical properties, especially with phosphorus-containing flame retardants, which often lead to polymer degradation and inadequate glow wire ignition temperatures.
Innovation Solution
A flame-retardant polyamide composition incorporating a salt of phosphorous acid and a phosphazene, along with fillers and long-chain aliphatic carboxylic acid esters, to enhance thermal stability and mechanical properties while maintaining electrical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If phosphorus-containing flame retardants are used to achieve flame retardancy, then flame resistance is improved, but polymer degradation occurs and glow wire ignition temperature becomes inadequate
Solution Approach 1:
The patent introduces a synergistic combination of phosphorus-containing flame retardants with specific additives (metal hydroxides, organic acids, and processing aids) that act as intermediaries to mitigate the harmful effects of phosphorus compounds on polymer stability, enabling both flame resistance and polymer integrity to be maintained
Solution Approach 2:
The invention creates a composite flame retardant system combining phosphorus compounds with metal hydroxides and organic additives, where the composite achieves superior flame resistance while the component interactions prevent polymer degradation, resolving the contradiction between flame safety and material reliability
2Object-affected harmful factors
If flame retardant additives are added to achieve fire safety, then flame resistance is improved, but mechanical properties and electrical integrity deteriorate
Solution Approach 1:
The patent optimizes the concentration ranges of multiple additives in the flame retardant system, adjusting parameters such as the ratio of phosphorus compounds to metal hydroxides and the amount of organic acids, to achieve fire safety while maintaining mechanical strength and electrical integrity within acceptable limits
3Object-affected harmful factors
If high concentrations of flame retardants are used to meet glow wire requirements, then flame resistance is improved, but processing stability and mechanical properties worsen
Solution Approach 1:
The patent introduces processing aids and organic acids as intermediary substances that facilitate the interaction between flame retardants and the polymer matrix, improving processing stability and reducing the required concentration of flame retardants to achieve target glow wire resistance
Solution Approach 2:
The invention optimizes the concentration parameters of flame retardants by introducing synergistic additives, achieving the same or better glow wire resistance at lower overall additive levels, thereby improving processing stability and manufacturing ease
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition achieves UL 94 V-0 rating, Glow Wire Flammability Index of 960 °C, and a Comparative Tracking Index greater than 550V, with improved flowability and reduced polymer degradation, ensuring high thermal stability and impact strength.
Implementation Method 1
flame-retardant polyamide composition, containing as component B) 2 to 25% by weight of a dialkylphosphinic acid salt and/or a diphosphinic acid salt and/or their polymers... as component C) 1 to 20% by weight of a salt of phosphorous acid and as component D) 1 to 50% by weight of a phosphazene
Implementation Method 2
achieves UL 94 V-0 rating, Glow Wire Flammability Index of 960 °C... ensuring high thermal stability and impact strength
Implementation Method 3
as component G) 0.1 to 5% by weight of a lubricant... improved flowability
Implementation Method 4
a Comparative Tracking Index greater than 550V... maintaining electrical integrity
Implementation Method 5
as component E) 1 to 50% by weight of a filler and/or reinforcing material... improved... impact strength
Data Source
AI summary
The invention relates to a flame-retardant, polyamide composition containing as component A) 1 - 96 wt.% of one or more thermoplastic polyamides, as component B) 2 - 25 wt.% of a dialkylphosphinic acid salt of formula (I) and/or a diphosphinic acid salt of formula (II) and/or polymers thereof, wherein R1, R2 are the same or different and C1-C6-alkyl are linear or branched or H, R3 represents C1-C10-alkylene, linear or branched, C6-C10-alkylene, linear or branched, C7-C20-arylalkylene; M represents C7-C20-arylalkylene; M represents Mg, Ca, AI, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na, K and/or a protonated nitrogen base; m is 1 - 4; n is 1 - 4; x is 1 - 4, as component C) 1 - 20 wt.% of a salt of the phosphoric acid, as component D) 1 - 20 wt.% of a phosphazene, as component E) 0 - 50 wt.% of a filling or reinforcing agent, as component F) 0 - 1 wt.% of a phosphonite or a mixture of phosphonite and a phosphite, and as component G) 0 - 1 wt.% of an ester or salt of long-chained aliphatic carboxylic acids (fatty acides), with the typical chain lengths of C14 - C40, the total of the components always amounting to 100 wt.%.