Aqueous colored coating composition and method for forming multilayer coating film
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Solution Overview
Problem
Existing coating compositions used with liquid discharge heads suffer from issues of discharge stability and sagging resistance, leading to non-uniform film thickness and inferior color reproducibility.
Innovation Solution
An aqueous colored coating composition with specific viscosities (20 to 100 mPa·s at 1,000 sec^-1 and 5,000 to 40,000 mPa·s at 0.1 sec^-1, along with a solid content concentration of 10 to 25% and tan δ of 0.25 to 0.80, enhances discharge stability and sagging resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coating composition uses a liquid discharge head that controls discharge by changing the relative distance between the valve body and the discharge port, then the application precision is improved, but the discharge stability deteriorates due to viscosity variations
Solution Approach 1:
The patent applies parameter changes by carefully controlling the viscosity of the coating composition within a specific range (20 to 100 mPa·s at 23°C and 1,000 sec⁻¹ shear rate) to ensure both discharge stability through the liquid discharge head and adequate sagging resistance in the formed coating film. This viscosity parameter optimization resolves the contradiction between achieving precise controlled discharge and maintaining reliable discharge stability.
2Reliability
If the coating composition has lower viscosity for easy discharge, then the discharge stability is improved, but the sagging resistance of the coating film deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the viscosity parameter within a specific range (20 to 100 mPa·s at 23°C and 1,000 sec⁻¹ shear rate). This parameter control ensures the coating composition is fluid enough for stable discharge through the liquid discharge head while maintaining sufficient viscosity to prevent sagging and ensure vividness in the formed coating film.
Solution Approach 2:
The patent applies dynamics by considering the viscosity behavior under different shear rates. The coating composition exhibits appropriate flow characteristics during discharge (high shear rate conditions) while maintaining sufficient viscosity at rest (low shear rate conditions) to prevent sagging. This dynamic viscosity behavior resolves the contradiction between discharge stability and sagging resistance.
3Illumination intensity
If the coating composition has higher solid content for vividness, then the color intensity is improved, but the discharge stability and film uniformity deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the solid content of the coating composition within the optimal viscosity range (20 to 100 mPa·s at 23°C and 1,000 sec⁻¹ shear rate). This parameter optimization ensures that the coating composition maintains sufficient color intensity and vividness while preserving discharge stability and film uniformity. The viscosity control compensates for variations in solid content to achieve balanced 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 ensures stable and controlled discharge, resulting in uniform film thickness and improved vividness, with excellent sagging resistance and color reproducibility.
Implementation Method 1
the aqueous colored coating composition has a viscosity (V1) of 20 to 100 mPa·s at a temperature of 23°C and a shear rate of 1,000 sec-1
Data Source
AI summary
The purpose of the present disclosure is to provide an aqueous colored coating composition that has excellent discharge stability and has excellent drip resistance and image clarity in a coating film to be formed when coating is performed using a liquid discharge head, which controls discharging of the composition by changing the relative distance between a valve body and a discharge port. The aqueous colored coating composition is for coating using the liquid discharge head, which controls discharging of the composition by changing the relative distance between the valve body and the discharge port, the aqueous colored coating composition having a viscosity (V1) of 20 to 100 mPa·s at a temperature of 23°C and a shear rate of 1,000 sec-1, and a viscosity (V2) of 5,000 to 40,000 mPa·s at a temperature of 23°C and a shear rate of 0.1 sec-1.