Polyamide Resin Composition with Silane Coupling Agent
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Solution Overview
Problem
Polyamide resin compositions reinforced with glass fiber face challenges in achieving high mechanical characteristics, particularly rigidity and impact resistance, especially when the glass fiber content exceeds 50% by weight, leading to issues with extrusion and insufficient bending elastic modulus.
Innovation Solution
Incorporating a silane coupling agent during melt kneading of a specific polyamide resin with glass fibers having a flat cross section, optimizing the ratio of glass fiber to polyamide and using a polyamide-reactive silane coupling agent to enhance adhesion, resulting in a composition with high bending elastic modulus and specific impact fracture mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the glass fiber content is increased to improve rigidity and mechanical characteristics, then the bending elastic modulus is improved, but extrusion becomes impossible and processing stability deteriorates
Solution Approach 1:
A silane coupling agent is introduced as an intermediary substance between the polyamide resin and glass fiber. The silane coupling agent chemically bonds to both the glass fiber surface and the polyamide resin, creating a bridge that improves interfacial adhesion. This allows high glass fiber content (70% or more) to be processed successfully through extrusion while maintaining high bending elastic modulus, as the coupling agent prevents fiber aggregation and improves melt flow characteristics
Solution Approach 2:
The invention changes the chemical parameters of the interface between glass fiber and polyamide resin by applying silane coupling treatment. This chemical modification of the glass fiber surface creates reactive groups that form strong bonds with the polyamide, fundamentally altering the interfacial properties and enabling stable extrusion at high filler concentrations
2Strength
If the glass fiber content is increased to achieve high rigidity, then the bending elastic modulus is improved, but the adhesion between polyamide resin and glass fiber deteriorates
Solution Approach 1:
The silane coupling agent serves as a mediator that chemically bridges the glass fiber and polyamide resin. The silane molecules bond to the glass fiber surface through siloxane bonds and simultaneously react with the polyamide resin through amide bonds, creating a strong interfacial connection that maintains adhesion even at high glass fiber content
Solution Approach 2:
The invention creates a composite material system consisting of three components: glass fiber, polyamide resin, and silane coupling agent. This tri-component composite structure leverages the synergistic effects of all three materials, where the silane coupling agent enhances the interface between the reinforcing phase (glass fiber) and the matrix phase (polyamide resin), resulting in improved overall adhesion and mechanical properties
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 enables stable extrusion with high glass fiber content, achieving bending elastic modulus of at least 23 GPa and maintaining impact resistance across varying temperatures, making the composition suitable for thinning polyamide resin products.
Implementation Method 1
a silane coupling agent (C) is added to the above mixture in a rate of 0.1 to 1.0% by weight of the above glass fiber bundles (B)
Implementation Method 2
adhesion of a polyamide resin to a glass fiber having a flat cross section is improved using a silane coupling agent
Data Source
AI summary
There is provided a polyamide resin composition reinforced with glass fiber produced by the melt kneading of a mixture where 60 to 80 parts by weight of glass fiber bundles (B) comprising a glass fiber having a flat cross section whose flatness degree is 1.5 to 8 and having an ignition loss at 625° C. for 0.5 hour of not more than 0.8% by weight are added to 40 to 20 parts by weight of polyamide (A), characterized in that, during the above melt kneading, a polyamide-reactive silane coupling agent (C) is added to the above mixture in a rate of 0.1 to 1.0% by weight of the above glass fiber bundles (B). The polyamide resin composition of the present invention has high bending strength, bending elastic modulus and Charpy impact strength (at 23° C. and −40° C.) by a specific fracture mode which have been never achieved before, and it is excellent in productivity.