Traffic Marking Compositions Using Polyfunctional Amines
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Solution Overview
Problem
Existing fast-drying coatings for exterior surfaces, such as roadways, suffer from reduced elongation at break and significant yellowing upon weathering, making them unsuitable for many applications due to their inability to withstand unanticipated rainfall and maintain quality under varying weather conditions.
Innovation Solution
The development of aqueous coating compositions containing anionically stabilized polymers, polyfunctional amines, and volatile bases, which reduce setting time and enhance early water resistance, while maintaining suitable physical properties for exterior applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If existing fast-drying additives are incorporated into coatings to decrease setting time, then the setting time and drying time are reduced, but the coatings suffer from decreased elongation at break and significant yellowing upon weathering
Solution Approach 1:
The patent changes the chemical parameters of the coating composition by incorporating polyfunctional amines with specific molecular weights (500-50,000 Daltons) and specific functional groups (amino, hydroxyl, carboxyl) in controlled amounts (0.1-5% by weight). This parameter change enables the coating to achieve fast drying times while maintaining elongation at break above 5%, resolving the contradiction between setting time and mechanical property reliability
Solution Approach 2:
The patent creates a composite coating system by combining polyfunctional amines with anionically stabilized polymers and volatile bases. This composite approach allows the coating to exhibit both fast-drying characteristics and maintained physical properties, including elongation at break and color fastness, thereby resolving the contradiction between setting time reduction and reliability preservation
2Loss of time
If existing fast-drying additives are incorporated into coatings to decrease setting time, then the setting time and drying time are reduced, but the coatings exhibit significant yellowing upon weathering
Solution Approach 1:
The patent changes the chemical composition parameters by using polyfunctional amines with specific molecular weights (500-50,000 Daltons) and specific functional group combinations. This parameter optimization enables the coating to dry quickly while resisting yellowing, as the specific amine structure prevents the degradation reactions that cause yellowing in conventional fast-drying coatings
Solution Approach 2:
The patent employs volatile bases that evaporate completely after facilitating the drying process. These volatile components perform their function of accelerating drying and then disappear, leaving no residual substances that could cause yellowing. This approach allows fast drying without the harmful long-term effects of conventional additives
3Loss of time
If polyfunctional amines are incorporated into coating compositions, then the setting time and drying time are decreased, but the coating may lose water resistance if not properly formulated
Solution Approach 1:
The patent optimizes the concentration parameters of polyfunctional amines (0.1-5% by weight) and combines them with anionically stabilized polymers that provide water resistance. This parameter control ensures that the fast-setting function is achieved while the polymer matrix maintains the water resistance property, preventing the trade-off between setting time and water resistance
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 coatings exhibit improved water resistance, reduced blistering, and enhanced scrub resistance compared to commercially available quick-drying agents, with a dry time suitable for road pavement paint, and improved color fastness, ensuring durability and performance in varying environmental conditions.
Implementation Method 1
additives have been incorporated into coatings to decrease setting time... By incorporating a polyfunctional amine... the setting time (and drying time) of the coating compositions can be decreased
Implementation Method 2
aqueous coating compositions comprising: an anionically stabilized copolymer, a polyfunctional amine, and a volatile base... These coatings exhibit fast drying times upon application to a surface
Implementation Method 3
The coating compositions also contain a volatile base... These coatings exhibit fast drying times upon application to a surface... improved early water (water wash-off) resistance
Data Source
AI summary
Disclosed are aqueous coating compositions containing an anionically stabilized polymer, one or more polyfunctional amines acting as crosslinking agents, and a volatile base. Coating compositions can further include one or more additional copolymers, which may or may not be anionically stabilized, and/or additional additives, including pigments, defoamers, pigment dispersing agents, thickeners, surfactants, and combinations thereof. By incorporating one or more polyfunctional amines, such as those comprising recurring units derived from the reaction of one tri-glycidyl moiety and a single di-, or tri-functional amino monomer, or a combination of mono/bi, mono/tri, mono/tetra, bi/bi, bi/tri, bi/tetra, tri/tri, tri/tetra, and tetra/tetra functional amino monomers with a bi- or tri-glycidyl moiety, water wash-off resistance of the coating compositions which comprise paint formulations, can be increased.