Alkyd Latex Miniemulsion Process for Hydrolytic Stability
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Solution Overview
Problem
Conventional emulsion polymerization methods for producing alkyd-latexes result in polymer particles that are not hydrolytically stable and lack the gloss and hardness of solvent-borne alkyd films, particularly due to the premature hydrolysis of metallic driers.
Innovation Solution
A miniemulsion process is developed where an oil phase comprising alkyd, ethylenically unsaturated monomers, and a metallic drier is dispersed under high shear in an aqueous phase with surfactants, allowing the drier to be solubilized in the oil phase, followed by free radical polymerization, which forms highly stable alkyd-latex particles with improved hydrolytic stability and film properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional emulsion polymerization is used to produce alkyd-latexes, then the process is simple and widely used, but the polymer particles lack hydrolytic stability and gloss
Solution Approach 1:
The patent changes the particle size parameter from conventional large particles (1-10 microns) to miniemulsion particles (40-700 nanometers). This parameter change in particle dimensions fundamentally alters the stability and film properties, achieving hydrolytic stability and gloss comparable to solvent-borne alkyds while maintaining a practical polymerization process.
Solution Approach 2:
The patent creates a composite miniemulsion system combining alkyd resin, ethylenically unsaturated monomers, and metallic driers in a specific configuration. The drier is physically associated with the alkyd within the miniemulsion droplets, creating a composite structure that prevents premature hydrolysis while enabling oxidative curing, thus achieving both stability and performance.
2Reliability
If metallic driers are post-added to alkyd technology, then the driers can mediate oxidative curing, but the driers undergo premature hydrolysis and deactivation
Solution Approach 1:
The patent merges the drier incorporation step with the emulsion formation process. Instead of post-adding driers to finished latex, the drier is incorporated into the oil phase along with alkyd and monomers before emulsification. This merging ensures uniform distribution and immediate physical association with alkyd, preventing premature hydrolysis while simplifying the manufacturing workflow.
Solution Approach 2:
The oil phase acts as an intermediary medium that facilitates the association between metallic driers and alkyd resin. The drier dissolves in the oil phase and becomes physically associated with the alkyd during miniemulsion formation, creating a protected complex that prevents water from accessing and hydrolyzing the drier, thus maintaining its activity.
3Manufacturing precision
If conventional emulsion polymerization with large monomer particles is used, then the process is straightforward, but the resulting latex lacks the film properties of solvent-borne alkyds
Solution Approach 1:
The patent applies high shear mixing energy (approximately 1000 Watts) to achieve intense droplet breakup and formation of miniemulsion with particle sizes of 40-700 nanometers. This parameter change in mixing intensity and particle dimensions creates the necessary conditions for forming stable latex particles that produce films with gloss and hardness comparable to solvent-borne alkyds.
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 process produces alkyd-latex particles with enhanced hydrolytic stability and film properties comparable to solvent-borne alkyds, with the drier being physically associated with the alkyd, preventing premature hydrolysis and deactivation, resulting in improved gloss and hardness in paint formulations.
Implementation Method 1
an oil phase comprising ethylenically unsaturated monomer(s), alkyd, and driers is dispersed in an aqueous phase under high shear conditions, forming a highly stable alkyd-monomer miniemulsion
Implementation Method 2
The miniemulsion can then be polymerized under free radical polymerization, producing a highly stable alkyd latex
Implementation Method 3
an oil phase comprising ethylenically unsaturated monomer(s), alkyd, and driers is dispersed in an aqueous phase under high shear conditions
Data Source
AI summary
A hybrid alkyd acrylic latex and a process for its preparation are taught. The process comprises forming an oil phase comprising an alkyd, a drier, and at least one ethylenically unsaturated monomer, wherein the oil phase solubilizes the drier; combining the oil phase with an aqueous phase, wherein the aqueous phase comprises a surfactant, to form a pre-emulsion; homogenizing the pre-emulsion thereby forming a miniemulsion, wherein the drier is solubilized in the oil phase; initiating the polymerization by adding a free radical initiator, thereby polymerizing the at least one ethylenically unsaturated monomer in the miniemulsion and forming a latex polymer emulsion having latex polymer particle sizes in the range of 40 nm to 700 nm.