Polycarbonate Resin Composition for High Gloss and Flame Retardancy
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Solution Overview
Problem
Thermoplastic resin compositions containing inorganic fillers like glass fibers face challenges in maintaining flowability and achieving good external appearance due to fiber protrusions, compromising properties such as impact resistance, thermal resistance, and flame retardancy.
Innovation Solution
A thermoplastic resin composition comprising 100 parts of polycarbonate resin, 1 to 15 parts of rubber-modified vinyl copolymer resin, 10 to 30 parts of phosphorus flame retardant, 3 to 12 parts of calcium carbonate, 5 to 40 parts of talc, and 0.001 to 5 parts of black pigment, with a specific weight ratio of calcium carbonate to talc and controlled particle sizes, which enhances flowability, impact resistance, thermal resistance, and dimensional stability while achieving high gloss and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic fillers such as glass fibers are added to improve rigidity and flame retardancy, then flame retardancy and rigidity are improved, but flowability deteriorates and external appearance suffers due to fiber protrusion
Solution Approach 1:
The patent removes glass fibers from the filler system and replaces them with talc and calcium carbonate. This extraction of the problematic component (glass fibers causing protrusion and flowability issues) while retaining the essential functions of rigidity and flame retardancy through alternative fillers.
Solution Approach 2:
The patent changes the particle size parameters of the fillers to optimize performance. Specifically, talc with 1-10 μm particle size and calcium carbonate with 0.1-10 μm particle size are used, creating a bimodal distribution that improves both flowability and surface appearance while maintaining flame retardancy and rigidity.
2Reliability
If inorganic fillers such as glass fibers are added to improve rigidity and flame retardancy, then flame retardancy and rigidity are improved, but external appearance deteriorates due to fiber protrusion
Solution Approach 1:
The patent removes glass fibers from the filler system that cause surface protrusion and appearance defects, replacing them with talc and calcium carbonate that provide similar functional benefits without the aesthetic drawbacks.
Solution Approach 2:
The patent optimizes particle size parameters of fillers (talc: 1-10 μm, calcium carbonate: 0.1-10 μm) to ensure fine, uniform distribution that prevents surface protrusion and maintains high gloss appearance while retaining flame retardancy.
3Strength
If rubber-modified vinyl copolymer resin is added to improve impact resistance, then impact resistance is improved, but flowability may deteriorate
Solution Approach 1:
The patent precisely controls the rubber-modified vinyl copolymer resin content within 1-15 parts by weight per 100 parts of polycarbonate resin, and optimizes filler particle sizes to maintain appropriate melt viscosity that balances impact resistance enhancement with adequate flowability for molding.
Data Source
Figure 1
AI summary
A thermoplastic resin composition and a molded article formed therefrom. The polycarbonate resin includes: 100 parts by weight of a polycarbonate resin; 1 to 15 parts by weight of a rubber-modified vinyl copolymer resin; 10 to 30 parts by weight of a phosphorus flame retardant; 3 to 12 parts by weight of calcium carbonate; 5 to 40 parts by weight of talc; and 0.001 to 5 parts by weight of a black pigment, wherein a weight ratio of calcium carbonate to talc ranges from 1:1.5 to 1:6 and the black pigment has an average particle size of 10 nm to 24 nm. The thermoplastic resin composition can realize high gloss and good appearance characteristics, and can exhibit good properties in terms of flowability, impact resistance, thermal resistance, thin film flame retardancy, dimensional stability, and the like.