Isocyanate Paint Composition for Bubble-Free Thin Film Coating
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Solution Overview
Problem
Existing paint compositions with high viscosity issues lead to gas bubbles, affecting coating quality, and lack improved drying properties, adhesion, and weather resistance.
Innovation Solution
A paint composition using an isocyanate prepolymer with a basic binder, where the NCO weight percentage is maximally 16 wt%, and an index ranging between 1.5 and 3.0, allowing for enhanced properties such as faster drying, improved adhesion, and low viscosity for easy degassing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If high viscosity paint composition is used, then thick film coating is achieved, but gas bubbles remain in the coating affecting quality
Solution Approach 1:
The patent changes the viscosity parameter of the paint composition by selecting specific binder types and ratios, enabling the coating to be applied as a thin film rather than requiring thick film application, thereby allowing gas bubbles to escape easily
Solution Approach 2:
Instead of applying thick film to ensure adequate coating, the patent inverts the approach by using low viscosity composition applied as thin film, which unexpectedly achieves better coating quality by allowing proper degassing
2Speed
If polyaspartic ester with excess polyisocyanate is used for fast curing, then drying speed is improved, but adhesion and weather resistance are insufficient
Solution Approach 1:
The patent uses a composite binder system combining multiple components (polyester polyol, epoxy, silicone epoxide, hydroxyacrylate) with isocyanate prepolymer, where each component contributes different properties: polyester polyol provides flexibility, epoxy provides adhesion, silicone epoxide provides weather resistance, and hydroxyacrylate provides fast curing
Solution Approach 2:
Different binder components are selected to provide localized functions: adhesion promotion at the substrate interface, weather resistance at the coating surface, and fast curing throughout the film, achieving comprehensive performance through functional differentiation
3Ease of operation
If isocyanate prepolymer with low NCO content is used, then viscosity is reduced for easy application, but curing speed may be affected
Solution Approach 1:
The patent optimizes the NCO content parameter of the isocyanate prepolymer to a specific range (10-16 wt%) that balances viscosity for easy application with sufficient curing speed, and compensates by optimizing the index to achieve both low viscosity and adequate reactivity
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 paint composition achieves faster drying, excellent adhesion, and improved weather resistance, with low viscosity enabling easy degassing and application as a thin film, reducing the risk of cracking and damage from environmental conditions.
Implementation Method 1
the chemical crosslinking (also known as 'fast curing' on account of the short reaction time) that results from the reaction between the -NH group of the polyaspartic ester and the isocyanate group of the polyisocyanate
Implementation Method 2
the so-called wet curing of the excess amount of polyisocyanate when it comes into contact with water
Data Source
AI summary
The present invention relates to a paint composition comprising a component A, being a basic binder, and a component B, being an isocyanate compound. The present invention also relates to the use of the present paint composition as a paint or top coat. The present invention moreover relates to an object of which at least one surface is coated with at least one layer of the present paint composition.