Phosphinate Flame Retardant Mixtures for Laser-Markable Polymers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Combustible plastics require effective flame retardants to meet high flame retardancy standards, but existing solutions often compromise processing stability and laser marking/welding capabilities due to chemical reactivity and high dosages needed.
Innovation Solution
A mixture of phosphinate salts, copper salts, and inorganic phosphonates is used to create polymer compositions that provide excellent flame retardancy, electrical properties, and laser markability/weldability, with specific weight ratios optimizing these properties simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high dosages of flame retardants are added to ensure sufficient flame resistance, then flame retardancy is improved, but processing stability deteriorates due to chemical reactivity leading to increased polymer degradation, crosslinking reactions, outgassing, or discoloration
Solution Approach 1:
The patent changes the chemical parameters of the flame retardant system by using specific phosphinic acid salts with controlled reactivity. The invention specifies phosphinic acid salts where R1 and R2 are alkyl groups with 2-12 carbon atoms, creating a balanced chemical composition that provides sufficient flame retardancy while maintaining processing stability through optimized molecular structure rather than simply reducing dosage.
Solution Approach 2:
The patent creates a composite flame retardant system by combining phosphinic acid salts with specific synergistic additives. This composite approach allows the system to achieve high flame retardancy through synergistic effects while the individual components are used at lower, more manageable concentrations that do not compromise processing stability.
2Reliability
If conventional flame retardant systems are used to achieve flame resistance, then flame retardancy is improved, but laser markability and electrical properties deteriorate
Solution Approach 1:
The patent develops a multi-functional flame retardant system based on phosphinic acid salts that simultaneously provides flame retardancy, good electrical properties (high CTI values), and laser markability. The specific chemical structure of the phosphinic acid salt and its synergistic combinations enable the system to perform multiple functions without compromising any single property, making it universally applicable across different performance requirements.
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 additive mixtures achieve high flame retardancy, excellent electrical values, and good laser marking/welding capabilities while minimizing polymer degradation and processing instability, meeting stringent standards like UL 94 and CTI.
Implementation Method 1
These agents cause a local, clearly visible discoloration by absorbing the laser energy in the plastic material, either directly through interaction with the polymer or indirectly through an added material. The laser-sensitive agent can be an organic dye or a pigment that absorbs laser light.
Data Source
AI summary
The invention relates to additive mixtures for plastics containing phosphinic acid salt of formula (I) as component A, where R1 and R2 mean ethyl, M is AI, Fe, TiOp or Zn, m means 2 to 3, preferably 2 or 3, and p = (4 - m) / 2 is a compound selected from the group of AI salts, Fe salts, TiOp salts or Zn salts of ethylbutylphosphinic acid, dibutylphosphinic acid, ethylhexylphosphinic acid, butylhexylphosphinic acid and/or dihexylphosphinic acid as component B, phosphonic acid salt of formula (II) as component C, where R3 means ethyl, Met is AI, Fe, TiOq or Zn, n means 2 to 3, preferably 2 or 3, and q = (4 - n) / 2, and copper as component D.