Adhesive Coating Composition for Non-Oriented Electrical Steel Sheets
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Solution Overview
Problem
Conventional adhesive coatings for non-oriented electrical steel sheets deteriorate during stress relief annealing, losing adherence and surface characteristics due to decomposition of organic materials at high temperatures, which affects magnetic properties and functionality.
Innovation Solution
An adhesive coating composition comprising 40-99 wt% of a water-soluble resin with an aromatic group and 1-60 wt% of composite metal phosphate, which forms a stable adhesive layer that maintains adherence and surface characteristics even after stress relief annealing, using a combination of epoxy-based, siloxane-based, or other resins with specific molecular weights and functional groups, and metal phosphates like aluminum, cobalt, or zinc phosphates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If organic adhesive coating is used for fastening electrical steel sheets, then adherence is achieved before stress relief annealing, but adherence deteriorates and is almost lost after stress relief annealing due to decomposition at high temperature
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive coating from conventional organic materials to a specific formulation containing water-soluble resin (40-99 wt%) and composite metal phosphate (1-60 wt%). This parameter change enables the coating to withstand stress relief annealing temperatures while maintaining adherence, as the inorganic metal phosphate components do not decompose like organic materials.
Solution Approach 2:
The patent creates a composite adhesive coating material combining water-soluble resin with composite metal phosphate. This composite structure provides both the adhesion properties of organic resins and the thermal stability of inorganic metal phosphates, resolving the contradiction between initial adherence and high-temperature stability.
2Strength
If conventional fastening methods (welding, clamping, interlocking) are used instead of adhesive coating, then adherence is maintained after stress relief annealing, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces mechanical fastening methods (welding, clamping, interlocking) with a chemical adhesive coating system. This substitution eliminates complex mechanical fastening devices and processes while achieving the same fastening function through the adhesive properties of the coating, thereby reducing device complexity and manufacturing cost.
3Device complexity
If organic adhesive coating is used to eliminate conventional fastening methods, then device complexity is reduced, but adherence is lost after stress relief annealing due to decomposition
Solution Approach 1:
The patent develops a composite adhesive coating combining water-soluble resin with composite metal phosphate. The inorganic metal phosphate component provides high-temperature stability and prevents decomposition, ensuring adherence reliability after stress relief annealing while maintaining the simplicity of the adhesive coating method.
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive coating to include specific ratios of water-soluble resin (40-99 wt%) and composite metal phosphate (1-60 wt%). This parameter optimization ensures both the simplicity of application and the reliability of adherence after high-temperature stress relief annealing.
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 adhesive coating composition ensures strong adherence, improved oil resistance, corrosion resistance, and insulation, maintaining magnetic properties and surface characteristics of non-oriented electrical steel sheets without the need for conventional fastening methods like welding or interlocking, even after thermal coalescence and stress relief annealing.
Implementation Method 1
An adhesive coating composition comprising 40-99 wt% of a water-soluble resin with an aromatic group and 1-60 wt% of composite metal phosphate, which forms a stable adhesive layer that maintains adherence and surface characteristics even after stress relief annealing
Implementation Method 2
an adhesive coating composition for a non-oriented electrical steel sheet includes: 40 to 99 wt % of a first component containing a water-soluble resin containing an aromatic group; and 1 to 60 wt % of a second component containing a composite metal phosphate
Implementation Method 3
In addition, it is required to have electrical characteristics that suppress generation of eddy currents
Data Source
AI summary
The present invention has been made in an effort to provide an adhesive coating composition capable of adhering (fastening) a non-oriented electrical steel sheet without using a conventional fastening method such as welding, clamping, or interlocking, a non-oriented electrical steel sheet stack to which the same is applied, and a manufacturing method thereof. According to an exemplary embodiment of the present invention, an adhesive coating composition includes: 40 to 99 wt % of a first component containing a water-soluble resin; and 1 to 60 wt % of a second component containing a composite metal phosphate.