Method for producing liquid-crystal polyester processed product
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Solution Overview
Problem
Liquid-crystal polyester resins exhibit poor adhesion and are difficult to dye, leading to challenges in producing laminates with high adhesive strength and colored products with maintained mechanical properties.
Innovation Solution
Incorporating a structural unit derived from aromatic hydroxycarboxylic acids with an alkyl group into the liquid-crystal polyester resin, followed by a short-time oxidation treatment such as plasma, corona, or UV irradiation to enhance wetting tension and adhesion, and subsequent stacking of resin or metal layers, with optional coloring using cationic dyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface roughening is performed on metal foil to improve adhesion, then adhesive strength is improved, but transmission loss increases
Solution Approach 1:
The invention changes the chemical parameter of the liquid-crystal polyester resin by incorporating aromatic hydroxycarboxylic acid units with specific substituents (formula (1)), which fundamentally alters the resin's surface properties and adhesion mechanism from physical interlocking to chemical bonding, eliminating the need for surface roughening
Solution Approach 2:
Instead of modifying the metal foil surface (traditional approach), the invention inverts the approach by modifying the liquid-crystal polyester resin itself through specific monomer selection and surface treatment, thereby improving adhesion without affecting the metal foil's electrical properties
2Strength
If surface treatment is performed for extended time to improve adhesion, then wetting tension is improved, but polymer chain cleavage occurs and film durability reduces
Solution Approach 1:
The invention changes the chemical structure parameter of the resin by incorporating aromatic hydroxycarboxylic acid units with specific substituents, which inherently provide better surface activity and adhesion properties, allowing effective surface treatment with shorter exposure times that preserve polymer chain integrity
Solution Approach 2:
The invention performs preliminary action by pre-selecting resin monomers with specific structures (formula (1)) that facilitate easier and more effective surface treatment, thereby enabling shorter treatment times that improve adhesion without causing excessive polymer degradation
3Ease of manufacture
If colorants are mixed with liquid-crystal polyester resin to achieve coloring, then colorability is improved, but resin strength reduces
Solution Approach 1:
The invention performs preliminary action by pre-modifying the resin surface through oxidation treatment to introduce polar groups and improve surface activity, enabling subsequent coloring processes to proceed without compromising the resin's mechanical strength
Solution Approach 2:
The invention changes the surface chemical parameter of the resin through oxidation treatment, creating a more reactive surface that can be colored more effectively while maintaining the bulk resin's structural integrity and strength
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 improves the adhesion and colorability of liquid-crystal polyester products, maintaining high mechanical properties and reducing the risk of performance degradation, enabling the production of laminates with high adhesion to smooth metal foils and colored fibers with varied hues.
Implementation Method 1
performing an oxidation treatment on a surface of a liquid-crystal polyester resin formed body
Implementation Method 2
the oxidation treatment in the step is a plasma treatment
Implementation Method 3
the oxidation treatment in the step is a plasma treatment, a corona treatment
Implementation Method 4
an ultraviolet irradiation treatment also causes molecular chain cleavage, thereby introducing polar groups to improve wettability and adhesion
Implementation Method 5
an ultraviolet irradiation treatment also causes molecular chain cleavage, thereby introducing polar groups
Data Source
AI summary
An object is to provide a method for producing a liquid-crystal polyester processed product, the method improving the adhesion of a liquid-crystal polyester resin, which is a poorly adhesive resin. As a solution, a method for producing a liquid-crystal polyester processed product, including a step (I) of performing an oxidation treatment on a surface of a liquid-crystal polyester resin formed body including a repeating unit represented by general formula (1), is provided.