Magnetic Sheet Composition Using Sulfonium Borate Curing Agent
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Solution Overview
Problem
Conventional magnetic sheets used for suppressing electromagnetic noise and in RFID applications face issues such as high-temperature, long-duration curing processes that consume water, leading to decreased production efficiency and heat resistance, and contain toxic antimony-based curing agents that cause environmental harm and corrosion due to halogen ion liberation.
Innovation Solution
A magnetic sheet composition using a sulfonium borate complex as a curing agent, which allows for low-temperature, high-speed curing and prevents halogen ion liberation, thereby reducing environmental impact and corrosion risks, while maintaining effective electromagnetic wave suppression and RFID functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature and long-duration curing is used to sufficiently cure the magnetic sheet, then the curing completeness is improved, but the production efficiency decreases and water consumption increases
Solution Approach 1:
The patent changes the chemical parameters of the curing agent from conventional sulfonium salts to amino-modified silane compounds, which fundamentally alters the curing reaction characteristics. This parameter change enables the system to achieve complete curing at lower temperatures and shorter durations, directly resolving the contradiction between curing completeness and production efficiency
2Productivity
If high-temperature curing is used to reduce curing time, then the production efficiency is improved, but the heat resistance of the insulating support deteriorates
Solution Approach 1:
The patent changes the curing temperature parameter from high temperature to low temperature range (20-100°C) by using amino-modified silane curing agents. This parameter change allows the magnetic sheet to be fully cured at temperatures that do not damage the insulating support, thereby improving production efficiency while preserving heat resistance
3Speed
If sulfonium-based cationic curing agent is used, then the curing speed is improved, but environmental harm and corrosion risk increase due to antimony content
Solution Approach 1:
The patent extracts and removes the toxic antimony element from the curing agent system by replacing sulfonium-based cationic curing agents with amino-modified silane compounds. This extraction eliminates the source of fluorine ion generation and environmental harm while maintaining effective curing performance
Solution Approach 2:
The patent replaces expensive and toxic sulfonium-based curing agents with cheaper, environmentally benign amino-modified silane compounds. The new curing agents achieve the required curing function without generating harmful byproducts, effectively substituting problematic materials with safer alternatives
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 magnetic sheet composition achieves efficient electromagnetic wave suppression, prevents corrosion, and reduces environmental impact by using a non-toxic curing agent, ensuring reliable performance in electronic equipment and RFID applications.
Implementation Method 1
a binder containing a thermosetting organic resin and a curing agent containing an amino-modified silane compound... the binder and the curing agent are mixed to form a magnetic sheet composition... low-temperature, high-speed curing
Implementation Method 2
The magnetic powder inhibits noise, and functions as a so-called noise depressor... the magnetic sheet is capable of suppressing undesirable electromagnetic waves emitted from an electronic equipment
Data Source
AI summary
A method for producing a magnetic sheet wherein a magnetic sheet composition is applied onto a substrate. The magnetic sheet composition contains: a binder; magnetic powder; and a curing agent, wherein the binder contains a thermosetting organic resin, and the curing agent contains a sulfonium borate complex expressed by General Formula 1:where R1 is an aralkyl group, R2 is a lower alkyl group, X is a halogen atom, and n is an integer of 0 to 3.