Polyamide Moulding Composition with Glass Flakes for Surface Quality
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Solution Overview
Problem
Existing polyamide moulding compositions fail to maintain good mechanical and surface properties in both dry and conditioned states, particularly lacking in stiffness, strength, and impact resistance while experiencing significant degradation in surface quality when exposed to humidity.
Innovation Solution
A polyamide moulding composition comprising 28.0-64.9 wt % of at least one polyamide, 15.0-40.0 wt % of glass fibres, 15.0-35.0 wt % of glass flakes with a specific particle thickness, 0.1-2.0 wt % of heat stabilizer, and 0-5.0 wt % of additives, ensuring a balanced endgroup ratio and specific monomer ratios to achieve enhanced mechanical and surface properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass fibres and glass flakes are used to enhance mechanical properties, then stiffness and strength improve, but surface quality deteriorates in conditioned state
Solution Approach 1:
The patent uses a composite reinforcement system combining glass fibres (15-40 wt%) and glass flakes (15-35 wt%) with specific particle thickness (0.3-2.0 μm) to achieve both high mechanical properties and good surface quality. The combination of different reinforcement types and optimized proportions creates a synergistic effect that resolves the contradiction between strength enhancement and surface quality maintenance.
Solution Approach 2:
The patent optimizes specific parameters including glass flake particle thickness (0.3-2.0 μm), reinforcement proportions, and polyamide composition (28.0-64.9 wt%) to simultaneously achieve high tensile elasticity modulus (≥15 000 MPa dry) and good surface gloss (≥70% in conditioned state). These parameter optimizations resolve the contradiction by finding the optimal balance point.
2Strength
If polyamide moulding composition is used to achieve good mechanical properties, then stiffness and strength improve, but impact resistance deteriorates in conditioned state
Solution Approach 1:
The patent creates a composite material system with polyamide matrix, glass fibres, and glass flakes that maintains both high stiffness (tensile elasticity modulus ≥15 000 MPa dry) and high impact resistance (≥50 kJ/m2 dry) even in conditioned state. The composite structure provides both strength and toughness, resolving the contradiction between stiffness and impact resistance.
Solution Approach 2:
The patent applies different reinforcement types in specific proportions: glass fibres (15-40 wt%) for stiffness and strength, and glass flakes (15-35 wt%) for impact resistance. This local optimization of reinforcement distribution within the composite material resolves the contradiction by assigning different functions to different components.
3Strength
If glass flakes with larger particle thickness are used to improve mechanical properties, then strength increases, but surface gloss deteriorates
Solution Approach 1:
The patent precisely controls glass flake particle thickness within the range of 0.3-2.0 μm (preferably 0.4-1.7 μm) to achieve both high mechanical strength and excellent surface gloss (≥70% in conditioned state). This parameter optimization resolves the contradiction by finding the optimal thickness range that provides sufficient strength while maintaining surface smoothness.
Solution Approach 2:
The patent combines glass flakes with specific particle thickness (0.3-2.0 μm) with glass fibres to create a composite reinforcement system that achieves both high strength and good surface quality. The thin glass flakes provide reinforcement without significantly degrading surface gloss, resolving the contradiction between strength and surface finish.
Data Source
AI summary
Polyamide moulding composition consisting of the following components(A) 28.0-64.9 wt % of at least one polyamide,(B) 15.0-40.0 wt % of glass fibres,(C) 15.0-35.0 wt % of glass flakes having a particle thickness in the range of 0.3-2.0 μm,(D) 0.1-2.0 wt % of heat stabilizer,(E) 0-5.0 wt % of additiveswith the proviso that the sum of components (B) and (C) is in the range of 35.0 to 65.0 wt %, based on the sum of components (A) to (E), and the sum of components (A) to (E) makes 100 wt %.