Aromatic Liquid Crystalline Polyester Resin Fluidity and Heat Resistance
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Solution Overview
Problem
The use of wholly aromatic liquid crystalline polyester resins with low melting points in manufacturing compounds degrades the heat resistance of the final product, compromising the material's performance in fine injection molding applications.
Innovation Solution
A blend of two wholly aromatic liquid crystalline polyester resins with different melting points (310-320°C and 360-375°C) and an additive, such as glass fiber, is used, with the low-melting-point resin comprising 5 to less than 10 parts by weight to the high-melting-point resin, to enhance fluidity while maintaining heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wholly aromatic liquid crystalline polyester resin with a low melting point is used to manufacture the wholly aromatic liquid crystalline polyester resin compound, then the fluidity is improved, but the heat resistance is degraded
Solution Approach 1:
The patent applies composite materials by blending two wholly aromatic liquid crystalline polyester resins with different melting points (310-320°C and 360-375°C) in a specific weight ratio (5 to less than 10 parts low-melting-point resin to 100 parts high-melting-point resin). This composite approach allows the low-melting-point resin to provide good fluidity during injection molding while the high-melting-point resin maintains heat resistance in the final product, thereby resolving the technical contradiction between fluidity and heat resistance.
2Ease of operation
If the amount of low-melting-point resin is increased to improve fluidity, then the fluidity is enhanced, but the heat resistance degradation becomes more severe
Solution Approach 1:
The patent applies parameter changes by precisely controlling the weight ratio of low-melting-point resin to high-melting-point resin at 5 to less than 10 parts per 100 parts. This specific parameter range optimizes the balance between fluidity enhancement (achieved by low-melting-point resin) and heat resistance maintenance (ensured by high-melting-point resin), preventing excessive heat resistance degradation while achieving sufficient fluidity improvement.
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different resin components based on their melting point characteristics. The low-melting-point resin (310-320°C) specifically contributes to fluidity during the molding process, while the high-melting-point resin (360-375°C) specifically maintains heat resistance in the final product. This functional differentiation resolves the contradiction by allowing each component to excel at its designated property.
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
This approach significantly improves the fluidity of the final product and reduces the risk of heat resistance degradation, making the material suitable for fine injection molding by optimizing the melting point ratio and incorporating fillers like glass fiber.
Implementation Method 1
a first wholly aromatic liquid crystalline polyester resin with a low melting point, a second wholly aromatic liquid crystalline polyester resin with a high melting point... wherein the melting points of the first and second wholly aromatic liquid crystalline polyester resins is be 310 to 320°C and 360 to 375°C
Data Source
AI summary
Provided are a wholly aromatic liquid crystalline polyester resin compound and a method of preparing the same. The wholly aromatic liquid crystalline polyester resin compound comprises a first wholly aromatic liquid crystalline polyester resin with a low melting point, a second wholly aromatic liquid crystalline polyester resin with a high melting point, and an additive, wherein the amount of the first wholly aromatic liquid crystalline polyester resin is 5 to 10 parts by weight with respect to 100 parts by weight of the second wholly aromatic liquid crystalline polyester resin.