Aqueous Wax Dispersion Stability via Segmentation
Solution Overview
Problem
Current aqueous wax dispersions suffer from high viscosity, particle agglomeration, and inadequate wetting, leading to instability and inefficiency in coating applications, while also containing environmentally harmful surfactants and VOCs.
Innovation Solution
Aqueous wax dispersions with particulate waxes of 0.1 μm to 6 μm size, using a minimal amount of dispersing agent to coat wax particles, resulting in low viscosity and no agglomeration, and being free of antifoams and defoamers, ensuring stability and environmental compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional aqueous wax dispersions are used, then wax particles can be dispersed in water, but the viscosity becomes high and particle agglomeration occurs
Solution Approach 1:
The patent segments the wax into ultra-fine particles with average diameter of 0.1-6 μm through mechanical energy input during mixing. This segmentation prevents agglomeration and reduces viscosity by creating sufficiently small particles that remain stably dispersed in the aqueous medium without forming large aggregates.
Solution Approach 2:
The patent applies excessive mechanical energy input during the mixing process to achieve complete wetting and dispersion of wax particles. The high-shear mixing conditions provide sufficient energy to break down wax agglomerates and ensure uniform distribution, overcoming the natural tendency toward aggregation.
2Stability of the object's composition
If conventional dispersing agents are used to wet wax particles, then particle distribution improves, but environmentally harmful surfactants and VOCs are introduced
Solution Approach 1:
The patent extracts and eliminates harmful surfactants and VOCs from the formulation by using a water-based aqueous dispersion system. The dispersion relies on mechanical energy input and ultra-fine particle size rather than chemical surfactants, thereby removing environmentally harmful substances while maintaining stable particle distribution.
Solution Approach 2:
The ultra-fine wax particles serve their own wetting and dispersion needs through the mechanical energy input during mixing. The high surface area to volume ratio of the ultra-fine particles, combined with sufficient mixing energy, enables spontaneous and uniform distribution in water without requiring external surfactant agents.
3Reliability
If wax particles are reduced to micronized size, then surface properties improve, but particle surface wettability becomes difficult to control
Solution Approach 1:
The patent applies excessive mechanical energy input during mixing to overcome the wettability control difficulty. The high-shear mixing conditions provide sufficient energy to ensure complete wetting of ultra-fine particles, compensating for the reduced ease of control that comes with smaller particle sizes.
Solution Approach 2:
The patent changes the particle size parameter to ultra-fine dimensions (0.1-6 μm) which fundamentally alters the wetting behavior. At this scale, the high surface area to volume ratio and the specific energy input during mixing create conditions where wettability is controlled by the mechanical energy of mixing rather than traditional surfactant chemistry.
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 solution provides stable, low-viscosity aqueous wax dispersions with improved slip, rub, and abrasion resistance, enhancing coating performance and compliance with FDA regulations for food packaging, while minimizing environmental impact.
Implementation Method 1
a dispersing agent that coats the surfaces of at least some of the wax particles
Data Source
AI summary
Aqueous wax dispersions useful as surface modifiers for paints, inks and coatings. More particularly, aqueous particulate wax dispersions useful as surface modifiers to provide improved properties in primers, paints, inks and other coating formulations. The dispersions are stable, substantially homogenous, have a high solids concentration at low viscosities, and comply with the applicable FDA regulations for use in food packaging applications.