Electrical Steel Sheet Adhesive Coating Composition
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Solution Overview
Problem
Existing adhesive coating compositions for electrical steel sheets face challenges in maintaining adherence after stress relief annealing, leading to reduced fastening force and compromised magnetic properties, as they rely heavily on organic materials which decompose at high temperatures.
Innovation Solution
A composition comprising 20-40 wt% resin, 10-35 wt% inorganic nanoparticles, 10-30 wt% metal phosphoric acid salt, and 10-40 wt% phosphoric acid, which forms an adhesive layer that maintains adherence without conventional fastening methods like welding or clamping, ensuring thermal fusibility and high-temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the composition ratio of organic material in the adhesive coating composition is increased to obtain thermal fusibility, then thermal fusibility is improved, but fastening force decreases after stress smoothing annealing
Solution Approach 1:
The patent applies composite materials by combining organic material (resin) with inorganic materials (inorganic particles and metal phosphoric acid salt) in specific ratios. The resin provides thermal fusibility while the inorganic components maintain fastening force after annealing, creating a composite adhesive system that resolves the contradiction between thermal fusibility and post-annealing strength
Solution Approach 2:
The patent changes the compositional parameters of the adhesive coating by specifying precise weight percentage ranges for each component (resin: 20-40%, inorganic particles: 10-35%, metal phosphoric acid salt: 10-30%). This parameter optimization ensures the adhesive achieves both thermal fusibility and maintains fastening force after stress relief annealing
2Strength
If conventional fastening methods such as welding or clamping are used to ensure strong bonding, then fastening force is improved, but magnetic properties deteriorate and manufacturing complexity increases
Solution Approach 1:
The patent replaces mechanical fastening methods (welding, clamping, interlocking) with a chemical adhesive system. The adhesive coating composition forms a bonding layer between steel sheets through thermal fusion and chemical adhesion, eliminating the need for mechanical fasteners that would compromise magnetic properties or require complex assembly processes
3Manufacturing precision
If the composition ratio of organic material is increased to satisfy surface quality requirements, then surface quality is improved, but adherence decreases after stress relief annealing
Solution Approach 1:
The patent uses composite materials where resin (organic) provides surface quality and inorganic particles with metal phosphoric acid salt provide thermal stability and adherence. The synergistic combination allows the adhesive to maintain both excellent surface quality and strong adherence after stress relief annealing
Solution Approach 2:
The patent optimizes the compositional parameters by limiting resin content to 20-40% while including inorganic particles (10-35%) and metal phosphoric acid salt (10-30%). This parameter control ensures the adhesive maintains adherence after annealing while achieving satisfactory surface quality
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 solution enhances adherence between electrical steel sheets, maintains magnetic properties, and provides excellent high-temperature adherence and oil resistance, even after stress relief annealing, without deteriorating surface characteristics.
Implementation Method 1
an adhesive coating composition for an electrical steel sheet, an electrical steel sheet product, and a method for manufacturing the same for improving adherence between electrical steel sheets
Implementation Method 2
the adhesive coating composition requires thermal fusibility in addition to the basic surface quality mentioned above
Data Source
AI summary
An electrical steel sheet adhesive coating composition according to an exemplary embodiment of the present invention includes, based on 100 wt % of the total solids: a resin at 20 to 40 wt % and having an average particle diameter of 10 to 300 nm; an inorganic nanoparticle at 10 to 35 wt % bonded with the resin; a metal phosphoric acid salt at 10 to 30 wt %; and phosphoric acid at 10 to 40 wt %.An electrical steel sheet product according to an exemplary embodiment of the present invention includes a plurality of electrical steel sheets; and an adhesive layer disposed between the plurality of electrical steel sheets, wherein the adhesive layer includes a metal of one or more kinds among Al, Mg, Ca, Co, Zn, Zr, and Fe at 0.5 to 30 wt %, N at 0.1 to 10 wt %, C at 0.1 to 5 wt %, P at 1 to 30 wt %, a metal of one or more kinds among Si and Ti at 10 to 30 wt %, and a balance of O.