One-Component Coating Composition In-Can Stability
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Solution Overview
Problem
One-component (1K) moisture-curing polyurethane coatings are prone to premature crosslinking due to residual water, leading to stability issues and performance deterioration, especially when using water-containing additives, necessitating improved methods for in-can stability.
Innovation Solution
The development of silane-modified polyurea coatings using a non-reactive resin dispersion process that includes grinding water-containing additives with a drying agent to minimize water content, followed by combination with silane-modified polyurea and a crosslinking catalyst, resulting in a stable 1K moisture-curing coating composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If water-containing additives are used in moisture-curing polyurethane formulations, then desirable coating properties can be achieved, but premature crosslinking occurs due to residual water causing instability
Solution Approach 1:
The patent extracts water from the system by using a drying agent (molecular sieve) to remove residual water from the slurry before adding the polyisocyanate component. This extraction of the harmful element (water) allows water-containing additives to be used while preventing premature crosslinking, thus resolving the contradiction between achieving desirable coating properties and maintaining in-can stability.
Solution Approach 2:
The patent applies preliminary action by performing the drying step before combining all components. The slurry is dried to remove residual water prior to adding the polyisocyanate, which prevents premature reaction. This preliminary removal of water enables the subsequent stable storage and controlled curing of the coating composition.
2Stability of the object's composition
If two-component coating systems are used to avoid premature crosslinking, then in-can stability is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent merges the water-containing additives, drying agent, and polyisocyanate into a single stable one-component formulation. By combining these elements and controlling the water content through the drying step, the patent eliminates the need for separate component storage and mixing equipment, thus reducing device complexity while maintaining in-can stability.
Solution Approach 2:
The patent changes the water content parameter of the slurry to a specific range (0.5-5% by weight) through the drying process. This parameter control allows the formulation to remain stable in a single component while still enabling the desired moisture-curing mechanism, thereby simplifying the system without sacrificing stability.
3Ease of manufacture
If residual water is present in the formulation, then manufacturing simplicity is maintained, but premature crosslinking occurs leading to performance deterioration
Solution Approach 1:
The patent changes the water content parameter to a controlled range (0.5-5% by weight) through drying with a molecular sieve. This controlled water level maintains formulation simplicity while preventing premature crosslinking, thus preserving coating performance and reliability without complicating the manufacturing process.
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
This approach enhances the in-can stability and application properties of 1K moisture-curing coatings by reducing premature crosslinking and improving hard-dry times, as demonstrated by lower initial viscosity and faster drying times compared to traditional methods.
Implementation Method 1
grinding water-containing additives with a drying agent to minimize water content
Implementation Method 2
moisture-curing polyurethane coatings can react with atmospheric water at room temperature to form films
Implementation Method 3
covalent bonds form between the resin components, thereby producing a cross-linked polymer network
Data Source
AI summary
The present disclosure describes a method of manufacturing a one-component coating composition. The method can include combining a water-containing additive with a non-reactive resin to form a grinding dispersion. The method can also include grinding the grinding dispersion to a Hegman value of at least 4 to form a ground dispersion. A drying agent can then be added to form a dried slurry. A silane-modified polyurea can be added to the dried slurry to form a one-component coating composition.