Liquid Crystal Polyester Composition With Metallic Look and Insulation
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Solution Overview
Problem
Liquid crystal polyester resin compositions containing metallic fillers face issues with reduced insulation resistance and impact strength when used in electronic components or tableware, limiting their application, and non-metallic fillers can cause hydrolysis and further reduce impact strength.
Innovation Solution
A method involving the use of non-metallic, powdery pigments like titanium oxide-coated plate-shaped inorganic filler particles, surface-treated to suppress photocatalytic activity, is combined with a liquid crystal polyester resin to enhance design and impact strength, using specific mixing techniques and conditions to prevent hydrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If metallic fillers are used to achieve metallic appearance, then design quality is improved, but insulation resistance is lowered
Solution Approach 1:
The patent uses an inorganic filler (such as glass flake, mica, or plate-shaped inorganic filler) as an intermediary substance to replace metallic fillers. This intermediary provides the desired metallic appearance and design quality while maintaining the insulation resistance required for electronic components, thus resolving the contradiction between aesthetic requirements and electrical performance.
2Reliability
If non-metal-based metallic filler is used to maintain insulation resistance, then insulation resistance is preserved, but impact strength may decrease
Solution Approach 1:
The patent specifies precise parameter ranges for the inorganic filler content (1-30 parts by mass per 100 parts by mass of liquid crystal polyester resin) and molecular weight (10,000-100,000) to optimize both impact strength and insulation resistance. By controlling these parameters within specific ranges, the patent achieves a balance where the inorganic filler provides metallic appearance and maintains insulation while the resin matrix retains sufficient toughness and impact resistance.
3Object-affected harmful factors
If titanium oxide coated filler is used to suppress photocatalytic activity, then surface treatment is applied, but residual acid may cause hydrolysis of ester bonds
Solution Approach 1:
The patent specifies that the inorganic filler should be surface-treated before incorporation into the resin composition to suppress photocatalytic activity. This preliminary surface treatment prevents subsequent hydrolysis of the ester bonds in the liquid crystal polyester resin, thereby maintaining the compositional stability and preventing deterioration of the molded article during use.
4Shape
If inorganic filler is incorporated to achieve metallic appearance, then design quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the inorganic filler with the liquid crystal polyester resin in a single composition formulation, merging the aesthetic function (metallic appearance) and structural function (impact strength, insulation resistance) into one integrated material system. This eliminates the need for separate coating or assembly processes, thereby simplifying the manufacturing process while achieving the desired metallic appearance.
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 method produces a liquid crystal polyester resin composition that enables the creation of articles with excellent design and impact strength, suitable for tableware and electronic components, while maintaining insulation resistance.
Implementation Method 1
Since titanium oxide has high photocatalytic activity, the surface of titanium oxide is generally surface-treated with an inorganic substance. Therefore, the plate-shaped inorganic filler particles coated with titanium oxide are used in a state where the high photocatalytic activity of titanium oxide is firmly suppressed by the surface treatment.
Implementation Method 2
the liquid crystal polyester resin may be deteriorated by hydrolysis due to the residual acid used in the surface treatment
Data Source
AI summary
A method for producing a liquid crystal polyester resin composition, including: a step (i) of mixing a component (P): liquid crystal polyester resin with a component (M): non-metallic and powdery pigment having a metallic color, in which the component (M) exhibits a pH of 5 to 9 at 23 °C in an aqueous dispersion obtained by mixing 10 g of the component (M) and 90 mL of ion-exchanged water.