Liquid Crystal Polyester Resin Composition for High Rigidity Connectors
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Solution Overview
Problem
Existing liquid crystal polyester resin compositions fail to achieve a balanced high rigidity and high strength, which is essential for advanced electrical and electronic components, particularly in connectors where insufficient rigidity leads to breakage and inadequate fixation.
Innovation Solution
A liquid crystal polyester resin composition is developed by blending two specific types of liquid crystal polyesters with particular repeating units and surface-treated glass fibers, optimizing the mass ratio and content of these components to enhance bending elastic modulus and bending strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If liquid crystal polyester is blended with silica fine particles or mica and carbon fiber to improve rigidity, then rigidity is enhanced, but mechanical strength and followability deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of liquid crystal polyester resin and hollow glass microspheres. This composite structure provides both rigidity enhancement and maintains mechanical strength, resolving the contradiction between rigidity improvement and mechanical property preservation that occurs with traditional fillers like silica or carbon fiber.
Solution Approach 2:
The patent changes the physical state and density parameters by introducing hollow glass microspheres with specific density (0.4-1.8 g/cm³) and size (5-50 μm). This parameter change allows rigidity improvement without the negative effects of traditional solid fillers, as the hollow structure provides rigidity while maintaining material ductility and strength.
2Volume of moving object
If height-reducing and downsizing are implemented in connectors, then device compactness is improved, but rigidity and fixation capability deteriorate
Solution Approach 1:
The hollow glass microsphere-composite liquid crystal polyester provides enhanced rigidity-to-weight ratio, enabling compact connector designs that maintain sufficient fixation capability. The hollow spheres create a cellular structure that resists deformation while keeping the overall component size reduced.
Solution Approach 2:
By controlling the hollow glass microsphere density and size parameters, the patent achieves optimal balance between compactness and rigidity. The specific density range (0.4-1.8 g/cm³) and size range (5-50 μm) allow the material to maintain high rigidity in reduced-size applications.
Data Source
AI summary
A liquid crystal polyester resin composition includes a liquid crystal polyester (A) including repeating units represented by formulae (I) to (III),a liquid crystal polyester (B) including repeating units represented by formulae (IV) and (V),and surface-treated glass fibers (C) including an epoxy resin on the surface thereof, wherein the mass ratio of (A) to (B) [A/B] is from 90/10 to 45/55, the content of (C) is from 10 to 130 parts by mass relative to 100 parts by mass of the total amount of (A) and (B), and as measured in a bending test using a strip-like molded article (length: 127 mm, width: 12.7 mm, thickness: 0.5 mm), the bending strength and the bending elastic modulus of the liquid crystal polyester resin composition are equal to or more than 330 MPa and equal to or more than 20 GPa, respectively.