Surface-treated glass cloth
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Solution Overview
Problem
The existing surface-treated glass cloths require multiple treatments with different silane coupling agents, complicating the process and reducing productivity while still facing issues with interfacial peeling that affect insulation reliability in printed wiring boards.
Innovation Solution
A surface-treated glass cloth with a single-layer surface treatment comprising a first silane coupling agent containing amines, a second silane coupling agent with quaternary ammonium cations, an organic acid, and a surfactant, applied in a single step, optimizing the mass% and molar ratio of these components to enhance bonding and prevent peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple surface treatments with different silane coupling agents are performed, then interfacial peeling is prevented and insulation reliability is improved, but the operation becomes complicated and productivity decreases
Solution Approach 1:
The patent combines multiple surface treatment functions into a single treatment solution containing both first silane coupling agent (with amine groups) and second silane coupling agent (with quaternary ammonium cations). This merging of functions eliminates the need for separate treatment steps while achieving the same reliability improvement that would otherwise require multiple sequential treatments.
Solution Approach 2:
The surface treatment solution is designed to perform multiple functions simultaneously: the first silane coupling agent provides glass affinity and basic bonding, while the second silane coupling agent provides enhanced hydrophobicity and additional bonding strength. This multi-functional approach allows a single treatment to achieve what previously required multiple specialized treatments.
2Reliability
If multiple surface treatments with different silane coupling agents are performed, then interfacial peeling is prevented, but the treatment process becomes complicated
Solution Approach 1:
The patent merges multiple treatment processes into one by formulating a composite surface treatment solution that contains both first silane coupling agent (with amine groups) and second silane coupling agent (with quaternary ammonium cations). This single combined treatment replaces the previously required multiple sequential treatments, simplifying the overall process while maintaining the reliability benefits.
Solution Approach 2:
The surface treatment solution is a composite formulation combining different types of silane coupling agents with specific functional groups. This composite approach allows the solution to deliver multiple protective functions simultaneously, preventing interfacial peeling through the synergistic action of different coupling agents in a single application step.
3Productivity
If a single surface treatment is performed, then productivity is improved, but interfacial peeling may occur reducing insulation reliability
Solution Approach 1:
The patent employs a composite surface treatment solution containing both first silane coupling agent (with amine groups) and second silane coupling agent (with quaternary ammonium cations) in specific proportions. This composite formulation enables a single treatment to provide the combined protective effects that previously required multiple treatments, thus maintaining insulation reliability while improving productivity.
Solution Approach 2:
The patent optimizes specific parameters of the surface treatment including the concentration ratios of different silane coupling agents (first silane coupling agent: 0.01-1.0 mass%, second silane coupling agent: 0.01-1.0 mass%), the molar ratio (1:10 to 10:1), pH value (2-12), and treatment temperature (20-100°C). These parameter optimizations ensure that a single treatment achieves sufficient bonding strength and hydrophobicity to prevent interfacial peeling.
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
This approach prevents interfacial peeling, enhances insulation reliability, and simplifies the treatment process, resulting in higher productivity and improved sticking ratios for printed wiring boards.
Implementation Method 1
a first silane coupling agent containing at least one amine selected from the group consisting of a primary amine, a secondary amine and a tertiary amine and containing no quaternary ammonium cation
Implementation Method 2
a compound having reactivity to both the glass and the matrix resin, namely, a so-called silane coupling agent
Implementation Method 3
a silane coupling agent exhibiting high hydrophobicity after the surface treatment is used in the second and subsequent treatment
Implementation Method 4
a content of the organic acid is in the range of 50 to 300 ppm based on the total amount of the surface-treated glass cloth
Data Source
AI summary
The surface-treated glass cloth includes a surface treatment layer on a surface, and the surface treatment layer includes: a first silane coupling agent containing at least one amine selected from the group consisting of a primary amine, a secondary amine and a tertiary amine and containing no quaternary ammonium cation; a second silane coupling agent containing at least one quaternary ammonium cation; an organic acid; and a surfactant. A total content of the first silane coupling agent and the second silane coupling agent is 0.05 to 1.20 mass% based on the total amount of the surface-treated glass cloth, a ratio of a molar content of the first silane coupling agent to a molar content of the second silane coupling agent is 1.1 to 10.0, and a content of the organic acid is 50 to 300 ppm based on the total amount of the surface-treated glass cloth.