Adhesion Layer Composition for Steel Sheets
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Solution Overview
Problem
Current adhesion layers for multi-layered surface-treatment steel sheets lack strong adhesiveness that is not influenced by the type of steel sheet, paint, or environmental and working conditions, and are not effective when exposed to corrosive environments or scratches.
Innovation Solution
A composition for an adhesion layer comprising a cationic urethane resin and a specific silicon compound in an aqueous medium, with a particular physical property ratio, which forms a strong adhesion layer that maintains adhesiveness even under corrosive conditions and mechanical stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chromate treatment and chromic rust preventive pigment are used, then adhesion and corrosion resistance are improved, but environmental friendliness deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters by using a phosphate-based treating solution instead of chromate, and employs inorganic zinc powder as a rust preventive pigment substitute. This parameter substitution maintains the protective function while eliminating harmful chromium compounds, resolving the contradiction between reliability and environmental friendliness
Solution Approach 2:
The invention uses readily available inorganic zinc powder as a rust preventive pigment, replacing expensive and hazardous chromic rust preventive pigments. This substitution provides effective corrosion protection without the environmental drawbacks, achieving both cost-effectiveness and environmental compatibility
2Reliability
If rust preventive pigment is added to paint composition, then corrosion resistance is improved, but appearance quality deteriorates
Solution Approach 1:
The invention introduces an adhesion layer as an intermediary between the steel sheet and the topcoat. This adhesion layer contains the rust preventive function through phosphate treatment and inorganic zinc powder, while the topcoat layer can be formulated without pigment interference, maintaining excellent appearance quality. The intermediary layer separates the protective function from the aesthetic function
Solution Approach 2:
The coating system is segmented into distinct functional layers: an adhesion layer providing corrosion protection through phosphate treatment and inorganic zinc powder, and a separate topcoat layer responsible for appearance. This segmentation allows each layer to optimize its specific function without compromising the other, resolving the contradiction between corrosion resistance and appearance quality
3Reliability
If chemical conversion treatment including chromate treatment is applied, then adhesion is improved, but environmental compatibility worsens
Solution Approach 1:
The invention fundamentally changes the chemical composition of the treating solution by replacing chromate-based chemicals with phosphate-based chemicals. This parameter substitution maintains the adhesion-promoting properties of chemical conversion treatment while eliminating toxic chromium compounds, thereby improving environmental compatibility without sacrificing adhesion performance
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 provides an extremely strong adhesiveness to the steel sheet surface, unaffected by the type of steel or paint, and maintains integrity even when exposed to corrosive environments or scratches, offering resource savings and cost reductions while avoiding chromium use.
Implementation Method 1
a composition for adhesion layer which is used for forming an adhesion layer which can provide an extremely excellent adhesiveness to a coating film
Implementation Method 2
coating a paint composition which is prepared by blending a polyester resin, a melamine resin curing agent, a rust preventive pigment, organic polymer minute particles, etc.
Data Source
AI summary
A composition for adhesion layer that is used for obtaining a multi-layered surface treatment steel sheet in which an adhesion layer is formed onto at least one surface of the steel sheet, and an upper layer and/or an intermediate layer which has a design and which contains a rust preventive pigment and/or a colored pigment is formed onto the adhesion layer; the composition including a cationic urethane resin and a silicon compound in an aqueous medium, and the ratio between the temperature at which the logarithmic decrement for the mixture of the cationic urethane resin and the silicon compound in the rigid-body pendulum type free damped vibration method shows the maximum value and the temperature at which the logarithmic decrement for the cationic urethane resin alone in the rigid-body pendulum type free damped vibration method shows the maximum value is in the range of 1.2 to 3.0.