Volatile-Free Coating System with Polymeric Polyamine
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Solution Overview
Problem
Existing single formulation waterborne sealants and coatings face challenges in achieving both long storage stability and rapid setting characteristics, often requiring volatile bases that can cause unpleasant odors and are undesirable in coating formulations.
Innovation Solution
A single formulation comprising an anionically stabilized dispersion of polymer particles, a polymeric polyamine, and an inorganic filler, where the polymer particles are present at specific concentrations and have specific properties, and the polymeric polyamine is used at a low concentration within a high viscosity formulation, allowing for storage stability without volatile bases and rapid setting upon application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a coating system uses volatile base to achieve rapid setting, then the setting speed is improved, but the formulation develops unpleasant odor and becomes undesirable
Solution Approach 1:
The invention extracts and eliminates the volatile base component from the formulation while retaining the rapid setting functionality through an alternative mechanism involving polymeric polyamine and anionically stabilized polymer particles that cure without requiring volatile base evaporation
Solution Approach 2:
The invention changes the chemical parameters of the formulation by using polymeric polyamine with specific molecular weight and functionality, along with anionically stabilized polymer particles, to achieve curing through chemical reaction rather than volatile base evaporation, thereby eliminating odor while maintaining setting speed
2Stability of the object's composition
If a coating system is designed for long storage stability, then the storage longevity is improved, but the set time increases and rapid setting is lost
Solution Approach 1:
The invention incorporates polymeric polyamine and anionically stabilized polymer particles in predetermined ratios and configurations during formulation, creating a pre-balanced system that remains stable during storage but is primed to react rapidly upon application through moisture-triggered curing
Solution Approach 2:
The invention optimizes specific parameters including polymer particle size distribution, polymeric polyamine molecular weight, and their ratio in the formulation to create a system that maintains colloidal stability during storage but undergoes rapid gelation upon exposure to atmospheric moisture
3Speed
If a coating system uses polymeric polyamine at high concentration to achieve rapid setting, then the setting speed is improved, but the storage stability deteriorates due to premature crosslinking
Solution Approach 1:
The invention uses a controlled, sub-stoichiometric amount of polymeric polyamine relative to the polymer particles, creating a formulation where the polyamine is present in sufficient quantity to enable rapid curing upon application but in limited quantity to prevent premature crosslinking during storage
Solution Approach 2:
The invention precisely controls the concentration of polymeric polyamine and the molecular weight of both polymeric polyamine and polymer particles to optimize the balance between storage stability and curing speed, using parameters such as amine functionality and polymer particle surface charge density
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 formulation demonstrates both storage stability and rapid setting properties without the need for volatile bases, as evidenced by aged storage testing and washout resistance, maintaining stability during storage and quickly forming a resistant film upon application.
Implementation Method 1
The system remains stable when basic and then set up when the pH drops. The pH drop is triggered after application of the system as volatile base evaporates from the system thereby lowering the pH of the system.
Implementation Method 2
The pH drop is triggered after application of the system as volatile base evaporates from the system thereby lowering the pH of the system.
Implementation Method 3
Upon application of the formulation as a coating, water evaporates and drives the polymer particles together despite the relatively high viscosity to facilitate completing the crosslinking required to set up the coating.
Data Source
AI summary
A formulation contains an anionically stabilized dispersion of polymer particles, a polymeric polyamine and an inorganic filler has a pH in a range of 6.0 to 8.5, viscosity greater than 15000 centipoise, and is free of volatile base, aminosilanes, and quaternary poly(allylamine).