Fiber-Reinforced Polyamide Molding for Uniform Dispersion and Warpage Control
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Solution Overview
Problem
Existing fiber reinforced thermoplastic resin molded articles face challenges in achieving good mechanical characteristics, particularly in terms of bending elastic modulus, appearance quality, and warpage suppression, due to uneven dispersion of reinforcing fibers, leading to potential breakage and surface irregularities.
Innovation Solution
A fiber reinforced thermoplastic resin molded article comprising reinforcing fibers with a specific length and thermal conductivity, a polyamide resin with a low melting point, and a modifying agent, where the components are balanced to ensure uniform dispersion and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing fibers are used in structural components, then mechanical strength is improved, but uneven dispersion of fibers causes decrease in tensile strength and impact resistance
Solution Approach 1:
The patent changes the physical and chemical parameters of the thermoplastic resin matrix, specifically using a resin with a melting point of 210°C or lower and controlling its flow characteristics. This parameter change enables the resin to effectively penetrate and disperse reinforcing fibers during the molding process, achieving uniform fiber distribution while maintaining high mechanical strength. The specific parameter range (melting point ≤210°C) is optimized to balance fiber dispersion capability with structural integrity.
2Strength
If reinforcing fibers are dispersed uniformly in thermoplastic resin, then tensile strength and impact resistance are improved, but surface irregularities occur causing decline in appearance quality
Solution Approach 1:
The patent optimizes the melting point parameter of the thermoplastic resin to 210°C or lower, which controls the resin's flow behavior during molding. This parameter change allows the resin to properly impregnate fiber bundles without excessive flow that would cause surface irregularities, thus achieving both uniform fiber dispersion and smooth surface finish.
3Strength
If fiber reinforced thermoplastic resin molded articles are produced with high mechanical characteristics, then bending elastic modulus is improved, but warpage suppression property deteriorates
Solution Approach 1:
The patent changes the thermal parameters of the thermoplastic resin matrix by selecting a resin with a melting point of 210°C or lower. This thermal parameter change affects the cooling and solidification behavior during molding, enabling better warpage control while maintaining high bending elastic modulus. The specific melting point range is optimized to balance structural rigidity with dimensional stability during the molding process.
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 solution results in a molded article with enhanced bending elastic modulus, appearance quality, and warpage suppression, making it suitable for applications in electrical and electronic devices, office automation equipment, home appliances, sports goods, and automobile parts.
Implementation Method 1
a polyamide resin (B) with a melting point of 210° C. or less
Implementation Method 2
a modifying agent (C)... the modifying agent (C) accounting for 1 part by mass or more and 10 parts by mass or less
Data Source
AI summary
A fiber reinforced thermoplastic resin molded article with good mechanical characteristics, particularly bending elastic modulus, appearance quality, and in particular warpage suppression property. A fiber reinforced thermoplastic resin molded article includes a reinforcing fiber (A) having a weight average fiber length of 0.4 mm or more and 1.5 mm or less and a thermal conductivity in the fiber axis direction of 5 W/mK or more, a polyamide resin (B) with a melting point of 210° C. or less used as matrix resin, and a modifying agent (C), wherein the reinforcing fibers (A) accounts for 10 parts by mass or more and 30 parts by mass or less, the polyamide resin (B) accounting for 60 parts by mass or more and 89 parts by mass or less, and the modifying agent (C) accounting for 1 part by mass or more and to 10 parts by mass or less.