Solvent Alkyd Coating Emulsion Iron Drier Color Stability
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Solution Overview
Problem
Solvent-containing alkyd resin coatings face challenges with long drying times, odor issues, and color stability, particularly with the use of cobalt and manganese-based driers, and the presence of silicon dioxide, which affects the performance of iron siccatives in water-free systems.
Innovation Solution
Incorporating a minimum of 4% water content into solvent-containing alkyd resin coatings to form a 'water-in-oil' emulsion, using iron-based siccatives, and omitting cobalt and manganese compounds, along with zirconium and calcium secondary driers, to achieve quick drying and color stability while avoiding silicon dioxide-based fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If cobalt or manganese-based driers are used for oxidative drying, then drying speed is improved, but color stability deteriorates (yellowish or greenish modification)
Solution Approach 1:
The patent uses iron-based driers instead of cobalt or manganese-based driers. Iron is a more common, less expensive metal that provides adequate drying functionality without the severe color contamination issues of cobalt (greenish) or manganese (reddish/pink) driers, especially in white or pale coatings.
Solution Approach 2:
The patent introduces a minimum water content of 4% by weight into the coating compound, creating a water-in-oil emulsion system. This parameter change enables iron-based driers to function effectively, as water facilitates the redox reactions necessary for iron siccative action, overcoming the traditionally slow drying of iron driers in anhydrous systems.
2Stability of the object's composition
If iron-based driers are used to avoid color variations, then color stability is improved, but drying speed deteriorates (drying times are much too long)
Solution Approach 1:
The patent changes the water content parameter to at least 4% by weight, creating a water-in-oil emulsion. This enables iron-based driers to achieve acceptable drying times by facilitating their redox chemistry, while maintaining color stability without cobalt or manganese contamination.
Solution Approach 2:
The patent employs a composite drier system combining iron-based primary drier with secondary driers (zirconium, calcium, magnesium, barium, zinc, lithium, or aluminium). This composite approach leverages iron's color stability and the catalytic activity of multiple metal salts to achieve both color purity and adequate drying performance.
3Object-affected harmful factors
If water-based coating compounds are used to reduce VOC content, then environmental compliance is improved, but application properties and visual appearance deteriorate
Solution Approach 1:
The patent creates a water-in-oil emulsion where water droplets are dispersed within an organic solventcontinuous phase. This local quality distribution allows the coating to benefit from water's low VOC properties while maintaining the application and visual appearance properties provided by the organic solvent environment.
Solution Approach 2:
The patent formulates a hybrid coating compound containing both water (minimum 4%) and organic solvents, creating a composite system that combines the advantages of both water-based (low VOC) and solvent-based (good application properties) coatings.
4Shape
If silicon dioxide-based matting agents are employed, then matting effect is improved, but drying performance deteriorates (iron siccatives do not function properly)
Solution Approach 1:
The patent removes silicon dioxide-based matting agents from the formulation to eliminate their interfering effect on iron siccative functionality. This extraction of the problematic component allows the iron-based drier system to function properly without unwanted interactions.
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 results in coatings with rapid drying, low odor, and excellent color stability, reducing VOC emissions and eliminating unwanted color variations, suitable for both interior and exterior applications.
Implementation Method 1
it can be assumed that the polarity of water as a solvent has an influence on the effectiveness of the siccative
Implementation Method 2
oxidative drying using oxygen from the air
Implementation Method 3
In order to achieve this object, a solvent-containing alkyd resin coating compound is provided with a water content which is higher than in the prior art and is preferably at least 4.0% by weight with respect to the total weight of the coating compound. Preferably, this solvent-containing alkyd resin coating compound is transformed into a 'water-in-oil' emulsion.
Data Source
AI summary
A solvent-containing coating compound for stains and varnish coatings, in particular for house varnishes or components thereof, containing or consisting of at least one oxidatively drying organic binder, selected from the group consisting of at least one oxidatively drying middle oil and/or long oil alkyd resin, in particular an oxidatively drying long oil alkyd resin, at least one primary drier based on iron, in particular comprising or consisting of at least one organic salt of iron and/or a coordination complex of iron, in particular a complex salt of iron, at least one first secondary drier, in particular comprising or consisting of at least one organic and/or inorganic salt or a compound of zirconium, magnesium, calcium, strontium, barium, zinc, lithium or aluminium, solvent, water, at least one emulsifying agent, optionally, at least one conventional additive.