Polycarbonate Resin Composition for High Specific Gravity
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Solution Overview
Problem
Thermoplastic resin compositions with high specific gravity often suffer from deterioration in mechanical properties, weather resistance, and flame retardancy when excessive inorganic fillers are used, leading to compromised sound quality and product integrity.
Innovation Solution
A thermoplastic resin composition comprising 100 parts of polycarbonate resin, 5-20 parts of rubber modified aromatic vinyl copolymer resin, 0.5-3 parts of maleic anhydride-grafted rubber polymer, 50-100 parts of glass fibers, 10-30 parts of barium sulfate, and 5-20 parts of phosphorus flame retardant, optimized to achieve a balance in impact resistance, weather resistance, and fluidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If inorganic fillers are increased to increase specific gravity, then sound quality is improved, but mechanical properties and weather resistance deteriorate
Solution Approach 1:
The patent optimizes the content ranges of multiple components simultaneously: polycarbonate resin (60-90 parts), rubber modified aromatic vinyl copolymer resin (5-20 parts), maleic anhydride-grafted rubber polymer (0.5-3 parts), glass fibers (50-100 parts), barium sulfate (10-30 parts), and phosphorus flame retardant (5-20 parts). This multi-parameter optimization achieves high specific gravity (1.55-1.65) while maintaining mechanical properties (impact strength 10-20 kgf·cm/cm) and weather resistance
Solution Approach 2:
The patent creates a composite material system combining polycarbonate resin with rubber modified aromatic vinyl copolymer resin and maleic anhydride-grafted rubber polymer. This composite structure improves impact resistance and overall mechanical properties while the barium sulfate provides high specific gravity, resolving the contradiction between weight and strength
2Weight of moving object
If inorganic fillers are increased to increase specific gravity, then sound quality is improved, but flame retardancy deteriorates
Solution Approach 1:
The patent introduces phosphorus flame retardant (5-20 parts) as an intermediary substance that mediates between the inorganic fillers (barium sulfate and glass fibers) and the polycarbonate resin matrix. This flame retardant maintains flame retardancy (V-1 or higher) while allowing high content of inorganic fillers to achieve high specific gravity
3Weight of moving object
If inorganic fillers are increased to increase specific gravity, then sound quality is improved, but processability deteriorates
Solution Approach 1:
The patent carefully controls the total content of inorganic fillers (glass fibers 50-100 parts + barium sulfate 10-30 parts) and optimizes the resin matrix composition with polycarbonate resin (60-90 parts) and rubber modified aromatic vinyl copolymer resin (5-20 parts). This parameter optimization achieves high specific gravity (1.55-1.65) while maintaining good fluidity (melt-flow index 30-45 g/10 min) for processability
Data Source
AI summary
A thermoplastic resin composition and a molded article formed of the same. The thermoplastic resin composition includes: about 100 parts by weight of a polycarbonate resin; about 5 to about 20 parts by weight of a rubber modified aromatic vinyl copolymer resin; about 0.5 to about 3 parts by weight of a maleic anhydride-grafted rubber polymer; about 50 to about 100 parts by weight of glass fibers; about 10 to about 30 parts by weight of barium sulfate; and about 5 to about 20 parts by weight of a phosphorus flame retardant. The thermoplastic resin composition can have high specific gravity and good properties in terms of impact resistance, weather resistance, flame retardancy, fluidity, and the like.