Acrylate-Functionalized Alkyd Coating for Low VOC
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Solution Overview
Problem
Current water-based alkyd dispersion coatings struggle to achieve high solid content with ultra-low volatile organic compounds (VOCs) while maintaining coating properties comparable to solvent-grade alkyds without resin functionalization.
Innovation Solution
A method for producing a coating composition with a high solid content alkyd dispersion, utilizing a combination of alkyd resins with low acid numbers and stabilizing agents, neutralized up to 200% with ammonia or other bases, and blended with water and surfactants to create a high internal phase emulsion, resulting in a solvent-free, low-VOC coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If water-based alkyd dispersions are formulated with high solid content and ultra-low VOCs, then environmental compliance is improved, but coating properties such as hardness, impact resistance, and gloss retention deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the alkyd resin by functionalizing it with acrylate groups, which fundamentally alters the resin's reactivity and bonding characteristics. This allows the coating to cure through both oxidative crosslinking (traditional alkyd mechanism) and acrylate-based crosslinking (new mechanism), thereby maintaining coating performance while achieving ultra-low VOC content and high solid content
Solution Approach 2:
The patent creates a composite coating system that combines acrylate-functionalized alkyd resin with acrylic copolymer emulsion. This composite approach allows the acrylate groups to provide enhanced crosslinking and bonding, while the acrylic copolymer matrix provides film formation and basic coating properties, resulting in superior overall performance that meets both environmental regulations and coating quality requirements
2Strength
If conventional alkyd resins are used in water-based coatings, then coating performance is maintained, but VOC content increases and environmental compliance worsens
Solution Approach 1:
The patent extracts and removes the volatile organic solvent component from traditional solvent-borne alkyd coatings by formulating a water-based dispersion system. The acrylate-functionalized alkyd resin is dispersed in water with minimal or no organic solvents, thereby eliminating VOC emissions while maintaining the essential coating properties through the functionalized resin's crosslinking capability
Solution Approach 2:
The patent fundamentally changes the solvent parameter from organic solvents to water, and modifies the resin chemistry by introducing acrylate functional groups. This dual parameter change enables the coating to achieve water-based formulation (zero or near-zero VOC) while the acrylate groups provide the crosslinking density needed for maintaining coating performance
3Adaptability or versatility
If alkyd resins are functionalized to improve water dispersibility, then water-based formulation is achieved, but resin complexity and manufacturing difficulty increase
Solution Approach 1:
The patent performs preliminary functionalization of the alkyd resin with acrylate groups during the resin synthesis stage, before the coating formulation process. This preliminary action incorporates the water-dispersing acrylate functionality directly into the resin structure, eliminating the need for separate functionalization steps or complex processing equipment, and simplifying the overall manufacturing process
Solution Approach 2:
The patent introduces acrylate functional groups at specific locations on the alkyd resin molecule (local quality) rather than requiring complete structural modification. This localized functionalization provides sufficient water dispersibility and crosslinking capability while maintaining the bulk alkyd resin structure and avoiding excessive complexity in the functionalization process
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 method produces coatings with improved pendulum hardness, impact resistance, gloss retention, and color stability, achieving performance comparable to solvent-grade alkyds with significantly reduced VOC emissions.
Implementation Method 1
an aqueous dispersion of alkyd resin based on fatty acids possessing conjugated unsaturation which is treated with an oxidizing agent
Implementation Method 2
The alkyd emulsion is suitable for use as a waterborne paint or surface coating composition
Implementation Method 3
which is treated with an oxidizing agent
Data Source
AI summary
The present invention provides a coating composition, a process for producing the same, one or more coating layers derived therefrom, and articles comprising one or more such coating layers. The coating composition according to the present invention comprises: (a) from 10 to 90 percent by weight of an aqueous, high-solid, solvent-free alkyd dispersion comprising: (i) from 40 to 70 percent by weight of one or more alkyds based on the total weight of the dispersion, wherein each said one or more alkyds has an acid value of less than 20 and a molecular weight (Mn) in the range of greater than 1000 Dalton; (ii) from less than 10 percent by weight of one or more surfactants, based on the total weight of the dispersion; and (iii) from 30 to 55 percent by weight of water, based on the total weight of the dispersion; wherein said aqueous, high-solid, solvent-free alkyd dispersion has an average particle size diameter in the range of from 0.05 to 5 µm; (b) from 10 to 90 one or more second dispersions, one or more second emulsions, or combinations thereof; wherein said coating composition has a solid content of in the range of from 25 to 65 percent by weight of solid content, based on the total weight of the coating composition, and the coating composition has a pH in the range of from 7 to 11, and wherein the coating composition has a volume average particle size in the range of from 0.03 to 5 µm, and wherein the coating composition has a viscosity in the range of from 100 to 10,000 cP.