Liquid Crystal Polyester Resin Composition with Fibrous Titanium Oxide
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Solution Overview
Problem
Liquid crystal polyester resin compositions face challenges in achieving satisfactory fluidity, mechanical properties, and flame retardancy while minimizing particle generation, especially during ultrasonic cleaning, which can lead to optical property deterioration in components like camera modules.
Innovation Solution
A liquid crystal polyester resin composition is developed by blending specific repeating units with fibrous titanium oxide, optimizing the composition ratios and incorporating fibrous titanium oxide to enhance fluidity, mechanical strength, and flame retardancy while suppressing particle generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flame retardants (halogen-based, phosphorus-based, or silicone) are added to liquid crystal polyester to improve flame retardancy, then flame retardancy is improved, but mold corrosion occurs due to gas generation
Solution Approach 1:
The patent converts the harmful effect of gas generation during flame retardancy testing into a beneficial outcome by using red phosphorus, which generates phosphoric acid that promotes crosslinking and enhances flame retardancy without causing mold corrosion. The previously harmful gas generation is transformed into a beneficial chemical reaction that strengthens the material.
Solution Approach 2:
The patent changes the chemical parameter of the flame retardant from conventional halogen-based or phosphorus-based compounds to red phosphorus, which has different chemical properties. This parameter change eliminates the gas generation problem while maintaining flame retardancy, as red phosphorus undergoes different chemical reactions that do not produce corrosive gases.
2Reliability
If red phosphorus is added to liquid crystal polyester to improve flame retardancy, then flame retardancy is improved, but white color applications are restricted
Solution Approach 1:
The patent applies local quality by using red phosphorus in specific concentrations and combinations with other materials to achieve flame retardancy without affecting color. The red phosphorus is used in controlled amounts (5-50 parts by mass per 100 parts of liquid crystal polyester) where it provides flame retardancy without interfering with the white color requirement, allowing localized optimization of properties.
3Reliability
If phosphorus-based compounds or silicone are added to liquid crystal polyester to improve flame retardancy, then flame retardancy is improved, but mold contamination and gas generation occur
Solution Approach 1:
The patent converts the harmful mold contamination and gas generation effects into beneficial outcomes by using red phosphorus. The phosphorus-based chemistry of red phosphorus promotes crosslinking and flame retardancy without producing the corrosive gases and mold contamination associated with conventional phosphorus-based compounds and silicone.
4Ease of operation
If liquid crystal polyester is used to achieve satisfactory fluidity, then fluidity is improved, but particle generation occurs during ultrasonic cleaning
Solution Approach 1:
The patent uses composite materials by combining liquid crystal polyester with specific fillers and additives to create a resin composition that maintains fluidity while suppressing particle generation. The composite structure includes the liquid crystal polyester base resin combined with functional additives that prevent fibrillation and particle formation during ultrasonic cleaning.
Solution Approach 2:
The patent applies preliminary anti-action by adding specific fillers and additives to the liquid crystal polyester composition before molding, which prevents fibrillation and particle generation during subsequent ultrasonic cleaning. The additives work in advance to strengthen the material structure and resist the mechanical stress of ultrasonic cleaning.
5Object-generated harmful factors
If inorganic fillers are added to liquid crystal polyester to suppress particle generation, then particle generation is reduced, but wettability between filler and resin is poor
Solution Approach 1:
The patent uses an intermediary substance (surfactant or coupling agent) to improve wettability between the inorganic filler and liquid crystal polyester resin. This intermediary layer enhances the interfacial adhesion, ensuring proper wettability and dispersion of the filler while maintaining the particle generation suppression effect.
Data Source
AI summary
An object of the present invention is to provide a liquid crystal polyester resin composition in which satisfactory fluidity and excellent mechanical properties as well as flame retardancy are obtained, and the generation of particles is suppressed, and a molded article composed of the liquid crystal polyester resin composition. The present invention relates to a liquid crystal polyester resin composition containing: 100 parts by mass of a liquid crystal polyester (A) including repeating units represented by the formulas (I) to (III),wherein Ar1 and Ar2 each represent one or more divalent aromatic groups, and p, q and r each represent a composition ratio (mol %) of each repeating unit in the liquid crystal polyester (A) and satisfy the following conditions, 35≤p≤90, 5≤q≤30, and 5≤r≤30; and 1 to 150 parts by mass of a fibrous titanium oxide (C).