Bio-based Coalescing Agents for Low VOC Coatings
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Solution Overview
Problem
Coating compositions with low VOC content face challenges in maintaining desirable properties such as durability, opaqueness, and drying speed, as coalescing agents are a primary source of VOCs and their reduction compromises film formation and stability, while existing alternatives lack environmental sustainability.
Innovation Solution
A bio-based coalescing agent, bis(2-ethylhexyl) succinate, derived from renewable sources like corn and other grains, is used in combination with various binders and solvents to create low VOC coating compositions that enhance film formation, hardness, and drying speed while meeting regulatory standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If coalescing agents are reduced to lower VOC content, then environmental compliance is improved, but film formation ability and stability are worsened
Solution Approach 1:
The patent changes the chemical parameters of coalescing agents by selecting esters with specific molecular weight ranges (300-700 g/mol) and functional groups that provide effective film formation at lower concentrations, thereby achieving low VOC content while maintaining film formation ability
Solution Approach 2:
The patent uses composite coalescing agent systems combining multiple ester components (e.g., dibutyl phthalate, diisobutyl phthalate, bis(2-ethylhexyl) phthalate) to achieve synergistic effects that improve film formation while reducing overall VOC content compared to single-agent systems
2Object-affected harmful factors
If coalescing agents are reduced to lower VOC content, then environmental compliance is improved, but drying speed is worsened
Solution Approach 1:
The patent selects coalescing agents with specific volatility parameters and evaporation rates that optimize drying speed while maintaining low VOC content, using esters with balanced vapor pressure characteristics
Solution Approach 2:
The patent employs multi-stage evaporation characteristics of selected ester combinations where initial fast-drying components provide quick surface drying followed by slower-evaporating components that complete the drying process, achieving overall improved drying speed at low VOC levels
3Object-affected harmful factors
If coalescing agents are reduced to lower VOC content, then environmental compliance is improved, but durability is worsened
Solution Approach 1:
The patent modifies the molecular structure parameters of coalescing agents by selecting esters with specific chain lengths and branching patterns that enhance polymer chain entanglement and intermolecular forces in the dried film, thereby improving durability at low VOC concentrations
Solution Approach 2:
The patent combines multiple ester-type coalescing agents in specific ratios to create a composite system where each component contributes different durability-enhancing properties, achieving superior overall durability performance while maintaining low VOC content
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 use of bis(2-ethylhexyl) succinate in coating compositions results in coatings with improved hiding power, increased hardness, reduced dirt pickup, faster drying, and lower odor, while being environmentally friendly and compliant with VOC regulations.
Implementation Method 1
A coalescing agent functions as a solvent as well as a plasticizer for the polymer particles and assists in formation of a coherent film
Implementation Method 2
Upon application of the coating materials, the solvents evaporate and the binders harden into a mechanically rigid state
Data Source
AI summary
A composition may include a binder; a coalescing agent with the general formula of wherein Z is C1-C10, wherein X is -H and Y is =0 or X is =0 and Y is -H or -CH3, and wherein R1 and R2 are independently selectable and comprise a C1-C12 or derivative thereof; and a solvent. The composition may be used in products like a paint, a coating, an adhesive, an ink, a toner, a sealant, a stain, a glaze, a carpet backing, and a primer.