Coating Composition for Extreme Climates
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Solution Overview
Problem
Existing exterior paints face challenges in applying and maintaining a dry coating thickness of at least 200 µm while masking microcracks less than 0.2 mm, especially in extreme climatic conditions, and require a balance between rapid drying in cold, wet weather and sufficient open time in hot, dry weather.
Innovation Solution
A coating composition comprising at least 8% by dry weight of a binder with a carboxylated polymer latex and branched polyetheramine polyol, combined with a drying additive containing a flocculant and volatile base, applied in a temperature range of 2°C to 35°C and relative humidity up to 90%, which forms a film and provides resistance to cracking and discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a drying additive is used to accelerate drying in cold and humid weather, then drying speed is improved, but open time becomes too short for application in hot and dry weather
Solution Approach 1:
The patent applies dynamics by making the drying additive's activity conditional on environmental parameters. The additive remains inactive during storage and only activates when specific conditions (temperature below 25°C and/or relative humidity above 75%) are met during application, allowing the paint to adapt its drying behavior to the climatic conditions
Solution Approach 2:
The patent uses parameter changes by formulating the drying additive with specific pH sensitivity (activation at pH below 9) and temperature/humidity responsiveness. The additive's drying effect is triggered only when environmental parameters fall within specific ranges, enabling rapid drying in cold/humid conditions while maintaining adequate open time in hot/dry conditions without activation
2Volume of moving object
If paint is applied to achieve a dry coating thickness greater than 200 μm to mask crazing and microcracks, then masking capability is improved, but mechanical performance and quality consistency deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the pH range (8.5-10.5) and drying additive concentration (0.01-1%) to achieve the desired coating thickness while maintaining mechanical integrity. The controlled pH environment prevents premature flocculation that would compromise film formation and mechanical performance
Solution Approach 2:
The patent uses composite materials by combining the binder system with a specifically formulated drying additive containing flocculant and volatile base. This composite formulation works synergistically to achieve both thick coating application capability and maintained mechanical performance through controlled drying mechanisms
3Reliability
If the pH of the drying additive is increased to activate flocculant in storage, then drying effectiveness is improved, but composition stability deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing a specific pH range (8.5-10.5) for the drying additive that balances flocculant activation with composition stability. This optimized pH window allows sufficient drying effectiveness while preventing premature reactions and maintaining stability during storage and application
Solution Approach 2:
The patent uses an intermediary approach by introducing a volatile base that temporarily raises pH to activate the flocculant during application, then evaporates to restore neutral conditions. This intermediary mechanism enables drying activation without long-term pH elevation that would compromise 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 composition achieves a dry coating thickness of 200 µm to 500 µm, effectively masking microcracks and maintaining resistance to rain, UV discoloration, and cracking, even in extreme conditions, ensuring a durable and versatile paint solution.
Implementation Method 1
a polymer latex of a carboxylated polymer, comprising an aqueous phase, capable of forming a film
Implementation Method 2
A drying additive comprising: b1) a flocculant
Implementation Method 3
b2) a volatile base, the pH of the drying additive being between 9 and 12
Data Source
Figure 1~3
AI summary
The invention relates to a coating composition comprising: a) At least 8% by dry weight, relative to the total weight of the composition, of a binder comprising: a1) a polymeric latex of a carboxylated polymer, comprising an aqueous phase, capable of forming a film, and a2) a branched polyetheramine polyol dissolved in the aqueous phase of said latex; and b) A drying additive comprising: b1) a flocculant, b2) a volatile base, the pH of the drying additive being between 9 and 12 in which the dry amount of flocculant is between 0.02% and 1.2% by dry weight, relative to the total weight of the composition.