Oxidized Polyolefin Particles for Stable Low Gloss Electrocoat
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Solution Overview
Problem
Cationically electrodeposited coatings with low gloss levels are difficult to achieve due to the settling of dense flatting agents like silicas and alumina silicates in electrocoat baths, leading to uneven coatings and increased costs from continuous recirculation, maintenance, and energy requirements.
Innovation Solution
Aqueous resinous dispersions containing an active hydrogen-containing, cationic salt group-containing polymer, a curing agent, and oxidized polyolefin particles, which provide stability and prevent settling, allowing for smooth, low gloss coatings without continuous recirculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional flatting agents like silicas and alumina silicates are added to achieve low gloss levels, then the desired gloss level is achieved, but the flatting agents settle in the electrocoat baths requiring continuous recirculation
Solution Approach 1:
The patent changes the physical parameters of the flatting agent by using oxidized polyolefin particles with density closely matching the electrocoat bath (1.01-1.05 g/cm³), preventing settlement while maintaining low gloss properties
Solution Approach 2:
The oxidized polyolefin particles serve as an intermediary material that provides the flatting effect while having compatible density with the bath components, acting as a bridge between the requirement for low gloss and the need for bath stability
2Stability of the object's composition
If continuous recirculation is employed to maintain paint homogeneity, then paint uniformity is maintained, but capital equipment costs, maintenance costs, and energy costs increase
Solution Approach 1:
The electrocoat bath system becomes self-regulating because the oxidized polyolefin particles naturally resist settlement due to their matched density, eliminating the need for external recirculation systems to maintain homogeneity
3Illumination intensity
If dense flatting agents are used to achieve low gloss, then the desired coating appearance is achieved, but the density results in coatings with uneven appearance that lacks smoothness
Solution Approach 1:
The patent optimizes the density parameter of the flatting agent to match the bath components, and controls particle size (0.1-10 micrometers) to ensure uniform distribution and smooth coating appearance while achieving low gloss
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 achieves stable dispersions that prevent settling, resulting in smooth, low gloss coatings with reduced capital and maintenance costs, and improved coating uniformity on complex parts.
Implementation Method 1
oxidized polyolefin particles... have a density that more closely matches the density of other bath components
Implementation Method 2
Electrodeposition as a coating application method involves the deposition onto a conductive substrate of a film-forming composition under the influence of an applied electrical potential
Data Source
AI summary
Disclosed are aqueous resinous dispersions that are electrodepositable and exhibit good anti-settling properties, as well as to their use to produce smooth, low gloss coatings. The aqueous resinous dispersions include an active hydrogen-containing, cationic salt group-containing polymer; a curing agent; and oxidized polyolefin particles.