Modified Water-Borne Alkyd Resin Gloss Retention
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Solution Overview
Problem
Existing modified water-borne alkyd resins have limitations in achieving high gloss and gloss retention due to low mass ratios of alkyd resin to ethylenically unsaturated monomers, leading to unstable latices and impaired coating performance.
Innovation Solution
An aqueous dispersion of modified alkyd resin is developed, comprising specific monomers and emulsifiers, with a higher mass ratio of alkyd resin to polymer, and a mixture of nonionic and anionic emulsifiers, which forms a stable emulsion with improved gloss and gloss retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a low mass ratio of alkyd resin to ethylenically unsaturated monomers is used, then the coating provides good water and humidity resistance, but the gloss and gloss retention are impaired
Solution Approach 1:
The patent changes the mass ratio parameter of alkyd resin to polymer from the conventional low ratio (1:2.3 to 1:0.66) to a high ratio (at least 1:0.5, preferably 1:0.3 or higher). This parameter change simultaneously achieves high gloss surfaces and excellent gloss retention while maintaining water and humidity resistance, resolving the contradiction between durability and appearance quality.
2Illumination intensity
If a high mass fraction of solids is used in the aqueous emulsion, then the coating provides high gloss, but the emulsion stability is compromised
Solution Approach 1:
The patent uses a composite emulsifier system combining nonionic emulsifiers (e.g., alkyl polyglycosides, alkyl phenol ethoxylates) and anionic emulsifiers (e.g., alkyl sulfonates, alkyl sulfates). This composite approach provides sufficient steric and electrostatic stabilization to maintain emulsion stability at high solid contents (40-80% by weight), enabling high gloss coatings without sacrificing stability.
Solution Approach 2:
The emulsifier acts as an intermediary substance between the alkyd resin/polymer and water phases. The specific combination of nonionic and anionic emulsifiers mediates the interaction between hydrophobic polymer components and water, allowing high solid content formulations to remain stable by reducing interfacial tension and providing steric/electrostatic barriers.
3Illumination intensity
If the mass fraction of alkyd resin in the aqueous emulsion is increased beyond conventional levels, then the gloss performance improves, but stable latices cannot be formed
Solution Approach 1:
The patent fundamentally changes the mass ratio parameter of alkyd resin to polymer to at least 1:0.5 (preferably 1:0.3 or higher), which is the inverse of conventional formulations. This parameter change, combined with the specific emulsifier system, enables the formation of stable latices at high alkyd resin content, achieving both high gloss and emulsion stability simultaneously.
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 a fast-drying coating with high gloss and excellent gloss retention, suitable for various surfaces, outperforming traditional alkyd-acryl combinations.
Implementation Method 1
heated upon addition of a radical initiator to effect a polymerisation reaction leading to formation of a latex
Implementation Method 2
an aqueous dispersion of a modified alkyd resin comprising water, an emulsifier, a polymer
Data Source
AI summary
The invention relates to an aqueous dispersion of a modified alkyd resin comprising water, an emulsifier S a copolymer P having moieties derived from one or more of esters M1 of an olefinically unsaturated carboxylic acid M11 having at least one olefinic unsaturation and at least one acid group per molecule, with a linear, branched or cyclic aliphatic hydroxy-functional compound M12 having at least one hydroxyl group per molecule, esters M2 of an olefinically unsaturated hydroxy functional compound M22 having at least one olefinic unsaturation and at least one hydroxyl group per molecule, with linear, branched or cyclic aliphatic carboxylic acid M21 having no olefinic unsaturation and at least one acid group per molecule, an olefinically unsaturated carboxylic acid M11 having at least one olefinic unsaturation and at least one acid group per molecule, an olefinically unsaturated hydroxy functional compound M22 having at least one olefinic unsaturation and at least one hydroxyl group per molecule, an olefinically unsaturated compound M3 that has at least one olefinic unsaturation, selected from the group consisting of olefinically unsaturated alkylaromatic compounds M31, olefinically unsaturated aliphatic ethers M32, olefinically unsaturated aliphatic ketones M33, olefinically unsaturated aliphatic halogenides M34, and olefinically unsaturated aliphatic pseudohalogenides M35, an alkyd resin A based on aliphatic linear or branched monocarboxylic acids A1 having from six to forty carbon atoms, aliphatic linear or branched or cyclic hydroxy-functional compounds A2 having at least two hydroxyl groups per molecule, aromatic or aliphatic linear, branched or cyclic acids A3 having at least two acid groups per molecule, wherein the alkyd resin A has an acid number of at least 3 mg/g, and wherein the ratio m(A) / m(P) of the mass m(A) of the alkyd resin A to the mass m(P) of the polymer P is at least 1 kg / 0.5 kg, a method for their preparation, and a method of use thereof.