Polyether Amine Rheology Control for Sag and Water Blushing Resistance
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Solution Overview
Problem
Existing paint compositions exhibit poor sag resistance and water blushing resistance in coating films, particularly on vertical surfaces, despite providing excellent transparency and water resistance.
Innovation Solution
A rheology control agent comprising a reaction product of a polyisocyanate compound, a primary monoamine with a molecular weight of 300 or less, and a polyether amine with two or more amino groups and a molecular weight of 1000 to 6000, where the polyether amine constitutes 18 to 28% of the total mass, is used to enhance sag resistance and water blushing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a conventional rheology control agent is used to improve sag resistance, then the coating film shows better sag control, but water blushing resistance and finished appearance deteriorate
Solution Approach 1:
The invention changes the molecular weight parameter of the polyether amine component to a specific range (1000-6000) and adjusts its proportion (18-28 mass%) to simultaneously achieve both sag resistance and water blushing resistance, resolving the contradiction between these two properties
Solution Approach 2:
The rheology control agent is designed as a composite material containing three specific components (polyisocyanate compound, primary monoamine, and polyether amine) with defined molecular weights and proportions, creating a material that exhibits both sag control capability and water blushing resistance
2Stability of the object's composition
If the polyether amine proportion is increased to improve sag resistance, then the coating viscosity increases, but water blushing resistance decreases
Solution Approach 1:
The invention optimizes the polyether amine proportion to a specific range (18-28 mass%) rather than simply increasing it, and specifies a molecular weight range (1000-6000) to achieve the balance between sag resistance and water blushing resistance
3Shape
If a rheology control agent with high molecular weight polyether amine is used to improve sag resistance, then the coating film shows better finished appearance, but water blushing resistance deteriorates
Solution Approach 1:
The invention specifies a molecular weight range (1000-6000) for the polyether amine that balances sag control (affecting finished appearance) and water blushing resistance, avoiding both too low and too high molecular weights
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 forms a coating film with improved sag resistance and reduced water blushing, ensuring a better finished appearance.
Implementation Method 1
a reaction product of a polyisocyanate compound (a1), a primary monoamine having a number average molecular weight of 300 or less (a2), and a polyether amine having two or more amino groups and having a number average molecular weight of 1000 or more and less than 6000 (a3)
Data Source
AI summary
A rheology control agent contains a reaction product of a polyisocyanate compound (a1), a primary monoamine having a number average molecular weight of 300 or less (a2), and a polyether amine having two or more amino groups and having a number average molecular weight of 1000 or more and less than 6000 (a3), wherein the proportion of the polyether amine having a number average molecular weight of 1000 or more and less than 6000 (a3) is within the range of 10 to 30 mass% based on the total amount of the components (a1) to (a3).