Liquid Crystalline Polyester Resin Composition for Camera Modules
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Solution Overview
Problem
Camera module components face issues with dust formation due to particle desorption from surfaces during sliding or impact, which existing liquid crystalline polyester resin compositions fail to adequately control, and alternative resins like nylon suffer from water absorption-related dimensional changes.
Innovation Solution
A liquid crystalline polyester resin composition is developed by blending 20 to 45 parts by weight of spherical silica particles with an average diameter of 15 μm to 30 μm into a liquid crystalline polyester resin, enhancing low dust formation, toughness, and impact strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If nylon resin is used to provide toughness and impact resistance, then sliding motion becomes smoother and impact resistance increases, but dimensional changes occur due to water absorption
Solution Approach 1:
The invention uses a composite material system consisting of liquid crystalline polyester resin as the base polymer and silica particles as filler. This composite provides both the toughness and impact resistance needed while maintaining dimensional stability, as the liquid crystalline polyester resin does not absorb water like nylon resin. The specific particle size range of silica (15-30 μm) optimizes both mechanical properties and dimensional stability.
2Object-generated harmful factors
If silica particles are added to liquid crystalline polyester resin to prevent dust formation, then dust formation due to fibrillation is reduced, but dust formation due to particle desorption during sliding or impact may occur
Solution Approach 1:
The invention optimizes the particle size parameter of silica filler to a specific range (15-30 μm average diameter). This parameter optimization prevents particles from being too small (which would cause fibrillation and dust) while avoiding particles that are too large (which would desorb during sliding or impact). The spherical shape of particles is also specified to improve flow characteristics and reduce stress concentration.
3Object-generated harmful factors
If smaller silica particles are used to prevent fibrillation, then dust formation during ultrasonic cleaning is reduced, but the resin may lose toughness and impact strength
Solution Approach 1:
The invention identifies and optimizes the particle size parameter to a specific range (15-30 μm) that balances two opposing requirements: preventing fibrillation during ultrasonic cleaning while maintaining toughness and impact strength. Particles smaller than 15 μm cause fibrillation, while particles 30 μm or larger reduce toughness. The specified range and spherical shape optimize both cleaning performance and mechanical properties.
Data Source
AI summary
A liquid crystalline polyester resin composition for use in camera modules includes 20 to 45 parts by weight of spherical silica particles (B) having an average particle diameter of 15 μm or more and less than 30 μm in 100 parts by weight of a liquid crystalline polyester resin (A). A polyamide resin composition with which a camera module exhibiting excellent low dust forming property, toughness and impact strength can be obtained.