LDS Resin Composition Hardness Control for Plating
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Solution Overview
Problem
The existing thermoplastic resin compositions with inorganic fibers and LDS additives often fail to achieve the desired mechanical strength, particularly when the LDS additive's Mohs hardness is similar to or higher than that of the inorganic fiber, leading to suboptimal mechanical properties in resin molded articles.
Innovation Solution
A thermoplastic resin composition comprising 10-150 parts by weight of inorganic fiber and 1-30 parts by weight of an LDS additive with Mohs hardness 1.5 or more lower than the inorganic fiber, specifically using copper, antimony, or tin-based additives, along with optional inorganic pigments and talc, to enhance mechanical strength and plating performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an LDS additive is added to thermoplastic resin mixed with inorganic fiber, then plated layer formation is achieved, but mechanical strength is insufficient when the LDS additive has similar or higher Mohs hardness than the inorganic fiber
Solution Approach 1:
The patent applies parameter changes by controlling the Mohs hardness difference between the LDS additive and inorganic fiber to be 1.5 or more. This quantitative parameter specification ensures that the LDS additive is sufficiently softer than the inorganic fiber, preventing damage to the fiber during laser irradiation while maintaining effective plated layer formation on the resin surface.
Solution Approach 2:
The patent creates a composite material system consisting of thermoplastic resin, inorganic fiber, and LDS additive with specifically controlled hardness relationships. This composite structure leverages the complementary properties of each component: the inorganic fiber provides mechanical strength, the thermoplastic resin provides formability, and the softer LDS additive enables plating while being protected by the harder fiber during laser processing.
2Strength
If inorganic fiber is added to thermoplastic resin to improve mechanical strength, then strength increases, but plated layer formation becomes difficult when LDS additive hardness is not properly controlled
Solution Approach 1:
The patent controls the Mohs hardness parameter of the LDS additive to be at least 1.5 units lower than the inorganic fiber. This parameter control ensures that during laser irradiation, the softer LDS additive can be properly activated and plated without being damaged by the harder inorganic fiber, thus maintaining reliable plated layer formation while preserving the mechanical strength benefits of the fiber reinforcement.
3Reliability
If LDS additive with high hardness is used to improve plating durability, then plating durability increases, but mechanical strength of the resin composition decreases
Solution Approach 1:
The patent inverts the conventional approach by making the LDS additive softer rather than harder than the inorganic fiber. This inversion resolves the contradiction by ensuring that the inorganic fiber protects the LDS additive during laser processing rather than being damaged by it, thereby maintaining both mechanical strength and plating durability through the reversed hardness relationship.
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 composition achieves improved bending strength, flexural modulus, and Charpy impact strength, allowing for successful formation of plated layers on resin molded articles, particularly suitable for portable electronic components like antennas.
Implementation Method 1
irradiating laser light onto the surface of a resin molded article which contains an LDS additive so as to activate only the portion irradiated by the laser light
Data Source
AI summary
Provided is a thermoplastic resin molded article excellent in bending strength, flexural modulus and Charpy impact strength, on which the plated layer may be formed in a successful manner. The thermoplastic resin composition for laser direct structuring comprising, per 100 parts by weight of the thermoplastic resin, 10 to 150 parts by weight of an inorganic fiber and 1 to 30 parts by weight of a laser direct structuring additive, the laser direct structuring additive containing at least one of copper, antimony and tin, and having a Mohs hardness 1.5 or more smaller than the Mohs hardness of the inorganic fiber.