Coating Composition Balancing Drying Speed and Moisture Transmission
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Solution Overview
Problem
Paints and coatings face challenges in achieving optimal drying speed and moisture vapor transmission, leading to issues such as spoilage from rainfall or insufficient open time due to varying weather conditions and substrate requirements.
Innovation Solution
A coating composition comprising an aqueous polymer latex of film-forming carboxylated polymer and branched polyetheramine polyol, combined with an acrylic binder, which balances drying speed and moisture vapor transmission by adjusting the dry weight ratio of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drying speed is increased to prevent rainfall spoilage, then the coating becomes more resistant to weather, but the open time becomes too short causing application problems
Solution Approach 1:
The coating composition uses a dynamic drying mechanism where the branched polyetheramine polyol creates a film that allows moisture vapor to escape during drying, enabling the coating to adapt its drying rate to environmental conditions. This dynamic property allows the coating to maintain extended open time while ultimately achieving weather resistance, as the film formation process can proceed at varying rates without compromising the final protective performance.
2Duration of action of moving object
If the drying speed is decreased to extend open time, then the coating allows more working time, but the coating becomes vulnerable to rainfall spoilage
Solution Approach 1:
The invention changes the chemical parameters of the binder system by using a branched polyetheramine polyol with essentially all tertiary amine groups. This parameter change fundamentally alters the drying mechanism, allowing the coating to maintain extended open time while developing inherent resistance to rainfall through the unique film formation characteristics of the polyol-based system.
3Adaptability or versatility
If the coating is made more permeable to moisture vapor, then the substrate can breathe, but the coating may lose adhesion strength
Solution Approach 1:
The coating uses a composite binder system combining aqueous polymer latex with branched polyetheramine polyol. This composite structure creates a matrix that simultaneously provides moisture vapor permeability through the polyol's molecular structure and maintains adhesion strength through the latex component, achieving both breathability and bonding performance.
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 ensures consistent performance across different weather conditions and substrates, maintaining adhesion and preventing spoilage while allowing for appropriate moisture vapor transmission.
Implementation Method 1
a branched polyetheramine polyol dissolved in the aqueous phase of the polymer latex
Implementation Method 2
the moisture vapour transmission of the coating is an important consideration, because some coatings are required to allow moisture vapour (such as water vapour) to exit the substrate through the coating
Implementation Method 3
an aqueous polymer latex of a film forming carboxylated polymer
Data Source
AI summary
A coating composition comprising: (a) a first polymeric coating binder, wherein the first polymeric coating binder comprises: (i) an aqueous polymer latex of a film forming carboxylated polymer; and (ii) a branched polyetheramine polyol dissolved in the aqueous phase of the polymer latex, wherein essentially all of the amino groups in the branched polyetheramine polyol are tertiary amine groups; and (b) a second polymeric coating binder, wherein the second polymeric coating binder comprises an acrylic binder; wherein the dry weight ratio of (a) to (b) is in the range of 70:30 to 20:80.