Amine-Free Aqueous Coating for Fast Drying High Build
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Solution Overview
Problem
Existing aqueous polymer emulsions for traffic paint formulations face challenges with slow dry times and poor durability, especially under humid conditions, and require the use of amines or pH adjustments, which can compromise shelf life and performance.
Innovation Solution
A high build, fast-drying aqueous coating composition using a latex binder formed by emulsion polymerization of hard and soft monomers with an acid-functional monomer, combined with a coalescing solvent like 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, which achieves rapid dry times and high durability without the need for amines or pH adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aqueous polymer emulsions with hard monomers are used to achieve high durability and water resistance, then film strength and water resistance are improved, but film formation temperature increases and drying time extends
Solution Approach 1:
The patent modifies the chemical composition parameters of the polymer emulsion by incorporating carboxyl-functional monomers (0.5-15 wt%) alongside hard and soft monomers. This compositional parameter change enables the film to achieve high water resistance while maintaining lower film formation temperature, as the carboxyl groups facilitate inter-particle bonding at lower temperatures.
Solution Approach 2:
The patent creates a composite polymer system combining hard monomers (for durability), soft monomers (for flexibility and low-temperature film formation), and carboxyl-functional monomers (for water resistance and adhesion). This composite approach allows the coating to simultaneously achieve high water resistance, low film formation temperature, and mechanical durability.
2Quantity of substance
If thick coating applications are used to achieve high build and coverage, then coverage and protection are improved, but drying time and hardening time increase
Solution Approach 1:
The patent changes the chemical parameters of the binder system by using carboxyl-functional monomers that promote rapid water evaporation and film formation. This parameter modification enables thick coatings (high build applications) to dry quickly by facilitating faster water removal and polymer particle coalescence, thus achieving both high film thickness and rapid drying.
Solution Approach 2:
The carboxyl-functional groups in the polymer chains are pre-configured to facilitate rapid water evaporation and inter-particle bonding. This preliminary chemical structure preparation enables the coating to quickly transition from wet to dry state even at thick applications, reducing drying time before the coating is applied.
3Temperature
If soft monomers are used to achieve low film formation temperature, then film formation temperature is reduced, but film hardness and durability decrease
Solution Approach 1:
The patent formulates a composite monomer system where soft monomers (30-70 wt%) provide low-temperature film formation capability, while hard monomers (10-50 wt%) contribute film hardness and durability. The carboxyl-functional monomers (0.5-15 wt%) enhance both properties through chemical bonding, creating a balanced coating that achieves low film formation temperature without sacrificing hardness or durability.
Solution Approach 2:
The patent assigns different functional roles to different monomer components within the polymer system. Soft monomers are responsible for low-temperature film formation, hard monomers provide structural strength and hardness, and carboxyl-functional monomers contribute to water resistance and adhesion. This local functional differentiation allows the coating to simultaneously achieve low film formation temperature and high film hardness.
4Stability of the object's composition
If amines are added to adjust pH and stabilize the emulsion, then emulsion stability is improved, but shelf life decreases due to polyamine interactions with anionic surfactants
Solution Approach 1:
The patent removes amine components from the formulation entirely, eliminating the source of polyamine-anionic surfactant interactions that cause premature curing and reduce shelf life. Instead, pH adjustment is achieved through alternative methods that do not involve amines, thus maintaining emulsion stability while preserving shelf life.
Solution Approach 2:
The patent replaces long-lasting but problematic amine-based pH adjusters with short-acting alternative pH control agents that do not interfere with anionic surfactants. These alternatives provide necessary pH adjustment during application but do not persist in the formulation to cause shelf life degradation, effectively using temporary solutions for temporary needs.
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 dry film thickness of up to 15 mils with drying times under 10 minutes and improved moisture resistance, crack resistance, and hardness, while maintaining shelf life and adhesion to high-traffic surfaces like concrete and masonry.
Implementation Method 1
Aqueous polymer emulsions have the ability to form polymer films on evaporation of the aqueous dispersing medium
Implementation Method 2
can be applied in a single coat thick application (i.e., high build), yet can dry and harden soon after application under ambient conditions
Data Source
AI summary
Coating compositions and methods providing a high build, fast drying, fast hardening non-amine containing aqueous latex binders are provided, wherein the coating composition is applied to a substrate at a wet film thickness to about 15 mils that ensure drying times of less than 10 minutes. The binder requires the use of at least one specific coalescent solvent with both anionic and non-anionic surfactants.