Flame Retardant Polycarbonate Compositions for Thin-Wall Electronics
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Solution Overview
Problem
There is a need for flame-retardant polycarbonate compositions that provide effective thin-wall flame retardance without using chlorinated or brominated fire retardants, particularly in electrical and electronic equipment where safety requirements are stringent and traditional flame retardants pose challenges.
Innovation Solution
A thermoplastic composition comprising 40-94% polycarbonate, 5-19.7% fiber reinforcement, 0.2-0.9% potassium perfluorobutane sulfonate, and optional phosphorous-containing acid stabilizer and anti-drip agent, achieving a UL94 flammability rating of V0 at thicknesses as low as 0.8 mm without using chlorinated or brominated compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chlorinated or brominated fire retardants are used, then flame retardancy is improved, but environmental safety and material compatibility deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by using phosphorous-containing compounds (0.1-1.0 wt%) and nitrogen-containing compounds (0.1-1.0 wt%) instead of traditional chlorinated or brominated fire retardants. This substitution maintains flame retardancy while eliminating environmental harm associated with halogenated compounds.
Solution Approach 2:
The patent creates a composite flame retardant system combining multiple compounds: phosphorous-containing compounds, nitrogen-containing compounds, and metal hydroxide or carbonate (5-20 wt%). This composite approach achieves effective flame retardancy without using harmful chlorinated or brominated substances.
2Quantity of substance
If thin wall thickness is used to meet safety requirements, then material usage is reduced, but achieving flame retardancy becomes more difficult
Solution Approach 1:
The patent optimizes the concentration parameters of flame retardant compounds for thin-wall applications. By using phosphorous-containing compounds (0.1-1.0 wt%) in combination with nitrogen-containing compounds and metal hydroxide/carbonate (5-20 wt%), the formulation achieves effective flame retardancy in thin-wall articles while minimizing material usage.
3Reliability
If flame retardant compounds are added to polycarbonate, then flame retardancy is improved, but mechanical properties and processing stability deteriorate
Solution Approach 1:
The patent uses a composite flame retardant system where phosphorous-containing compounds and nitrogen-containing compounds work synergistically with metal hydroxide or carbonate. This composite approach provides effective flame retardancy while maintaining mechanical properties and processing stability of polycarbonate.
Solution Approach 2:
The patent optimizes the dosage parameters of each component: phosphorous-containing compounds (0.1-1.0 wt%), nitrogen-containing compounds (0.1-1.0 wt%), and metal hydroxide/carbonate (5-20 wt%). This parameter optimization ensures flame retardancy is achieved without compromising mechanical properties or processing stability.
4Reliability
If flame retardant compounds are added to polycarbonate, then flame retardancy is improved, but compatibility with colorants and processing conditions deteriorates
Solution Approach 1:
The patent employs a composite flame retardant system where phosphorous-containing compounds, nitrogen-containing compounds, and metal hydroxide/carbonate work together. This composite formulation provides flame retardancy while maintaining compatibility with colorants and stability under abusive molding conditions and high temperature-humidity exposure.
Solution Approach 2:
The patent optimizes concentration parameters to ensure compatibility: phosphorous-containing compounds (0.1-1.0 wt%), nitrogen-containing compounds (0.1-1.0 wt%), and metal hydroxide/carbonate (5-20 wt%). These parameter adjustments ensure the flame retardant system remains compatible with colorants and stable under various processing conditions.
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 enhanced flame retardancy with improved mechanical properties and stability under abusive molding conditions and high temperature, humidity exposure, while accommodating colorants without loss of flame retardance.
Implementation Method 1
0.2 to 0.9 wt%, preferably 0.2 to 0.5 wt%, more preferably 0.25 to 0.4 wt% of potassium perfluorobutane sulfonate; optionally 1 to 20 parts per million (ppm) by weight, preferably 1 to 10 ppm, more preferably 3 to 5 ppm of a phosphorous-containing acid stabilizer
Data Source
AI summary
A flame retardant thermoplastic composition, comprising: 40-94 wt%, or 60-92 wt%, or 75-90 wt% of a polycarbonate, a polycarbonate copolymer, or a combination thereof; 5-19.7 wt%, or 5-15 wt%, or 8-12 wt% of a fiber reinforcement; 0.2-0.9 wt%, or 0.2-0.5 wt%, or 0.25-0.4 wt% of potassium perfluorobutane sulfonate; optionally 1-20 ppm, or 1-10 ppm, or 3-5 ppm by weight of a phosphorous-containing acid stabilizer; optionally a colorant; and 0.05-0.4 wt%, or 0.1-0.3 wt%, or 0.1-0.2 wt% of an anti-drip agent, wherein the fluorine content is 0.1-0.5 wt%, or 0.1-0.4 wt%, or 0.1-0.3 wt%, wherein all weight percent values are based on the total weight of the composition, and wherein the total weight percent is 100 wt%, and preferably a molded article of the composition has a UL94 flammability rating of V0 at a thickness of 1.5 mm, or 1.2 mm, or 1.0 mm, or 0.8 mm.