Alkyd Coating Composition Using Polyaspartic Esters
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Solution Overview
Problem
Alkyd resin-based coating compositions face challenges with short pot life, high reactivity, and aesthetic issues due to the use of polyaspartic acids, which limit their application and performance, particularly in terms of drying speed, flexibility, and compatibility with alkyd colorants.
Innovation Solution
Combining an alkyd binder with a medium or long oil content and polyaspartic acids or their esters, along with an isocyanate compound, to create a coating composition that enhances drying speed, flexibility, and compatibility while maintaining the benefits of alkyd binders such as colorant compatibility and ease of application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If polyaspartic acids are used to accelerate drying, then drying speed is improved, but pot life is reduced and flexibility is worsened
Solution Approach 1:
The patent uses polyaspartic esters as an intermediary substance that mediates between the conflicting requirements of fast drying and long pot life. The ester group modifies the reactivity of the polyaspartic acid, creating a balanced curing agent that provides both acceptable drying speed and extended pot life, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent changes the chemical structure parameter of the polyaspartic acid by introducing ester groups, which alters the reactivity parameters. This structural modification allows tuning of the curing kinetics to achieve both adequate drying speed and extended pot life, simultaneously addressing both requirements that were previously contradictory.
2Speed
If polyaspartic acids are used to improve drying speed, then drying speed is improved, but film flexibility is worsened
Solution Approach 1:
The patent modifies the chemical structure parameter of the curing agent by using polyaspartic esters instead of conventional polyaspartic acids. This structural change alters the crosslinking density and network flexibility parameters, achieving a balance between drying speed and film flexibility that resolves the contradiction between these two properties.
3Speed
If conventional polyaspartic acids are used, then drying speed is improved, but compatibility with alkyd colorants is worsened
Solution Approach 1:
The patent introduces polyaspartic esters as an intermediary curing agent that is compatible with both alkyd resins and colorants. The ester-modified structure provides better compatibility with alkyd colorants while maintaining acceptable drying speed, mediating between the conflicting requirements of fast curing and color stability.
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 proposed solution improves the drying speed of alkyd-based coating compositions, extends pot life, and maintains the advantages of alkyd binders, including colorant compatibility and rheological properties, while providing improved flexibility and curing efficiency.
Implementation Method 1
the binder polymers undergo autoxidation and subsequently form cross-links between the polymer chains resulting in a solid and coherently dried film
Implementation Method 2
the binder polymers undergo autoxidation and subsequently form cross-links between the polymer chains
Implementation Method 3
When the coating composition is applied to a substrate, the drying process starts by solvent evaporation and the binder polymers undergo autoxidation and subsequently form cross-links between the polymer chains resulting in a solid and coherently dried film. The drying process of autoxidizable architectural coating compositions takes place at ambient temperatures ranging from -10 to 50° C, whereby the presence of oxygen is essential.
Data Source
AI summary
The invention relates to a coating composition comprising: a) at least one alkyd binder with an oil content of at least 45 wt% and at most 85 wt%, a modified alkyd binder, or a combination thereof; b) at least one amine or imine component selected from the group comprising: polyaspartic acids and esters thereof, (meth)acrylate/aspartate amines, aldimines, ketimines, and combinations thereof; and c) at least one isocyanate compound.