Low VOC Coalescing Agents from Polyamide By-Products
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Solution Overview
Problem
Current coalescing agents used in paint formulations exceed VOC regulations, necessitating the development of low VOC coalescing agents that effectively reduce the glass transition temperature of latex while maintaining compatibility and hydrolytic stability.
Innovation Solution
A low VOC coalescent composition derived from by-products in the production of polyamide 6,6, specifically a blend of esters from adipic, methylglutaric, and ethylsuccinic diacids, which reduces VOC levels by at least 50% compared to traditional agents like Texanol, while maintaining film formation efficiency and compatibility with paint components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional coalescing agents like Texanol are used, then film formation efficiency is improved, but VOC content increases
Solution Approach 1:
The patent changes the chemical parameters of coalescing agents by using high boiling point esters (boiling point >200°C) derived from polyamide production by-products. These esters have different molecular structures and physical properties compared to traditional coalescing agents, achieving both low VOC content and effective film formation through parameter optimization
Solution Approach 2:
The patent converts waste by-products from polyamide production into valuable low VOC coalescing agents. The harmful waste streams are transformed into beneficial coating additives that meet environmental regulations while maintaining technical performance
2Temperature
If coalescing agent concentration is increased to improve film formation, then MFFT reduction is improved, but VOC content increases
Solution Approach 1:
The patent uses esters with significantly higher boiling points (>200°C) compared to traditional coalescing agents. This parameter change allows the system to achieve effective MFFT reduction at lower concentrations, thereby reducing overall VOC content while maintaining film formation efficiency
3Object-generated harmful factors
If evaporation rate is decreased to meet VOC regulations, then VOC compliance is improved, but coalescence effectiveness may worsen
Solution Approach 1:
The patent selects esters with optimized boiling points (>200°C) and molecular structures that balance evaporation rate and coalescence effectiveness. The high boiling point ensures low VOC content while the molecular structure maintains adequate plasticizing ability for effective film formation
Solution Approach 2:
The patent uses blends of different ester types (adipate, glutarate, succinate esters) to create composite coalescing systems. This composite approach allows optimization of both evaporation characteristics and coalescence effectiveness through synergistic interactions between different ester components
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 new coalescent composition achieves significant VOC reduction, efficient film formation at lower temperatures, and improved hydrolytic stability, making it suitable for compliance with current and future VOC regulations without compromising paint performance.
Implementation Method 1
coalescing agents act as temporary plasticizers to reduce the glass transition temperature (Tg) of the latex below that of the drying temperature to allow for good film formation
Implementation Method 2
coalescing agents function by softening the polymer particles in a latex, enabling the formation of a continuous film as the coating cures
Implementation Method 3
coalescing agents are high boiling point solvents (that are slow to evaporate) used to reduce the minimum film formation temperature (MFFT) of paints
Data Source
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AI summary
A coalescent composition for coating compositions such as paints, adhesives, and coatings comprising a blend of dibasic esters, specifically (i) esters of adipic, glutaric, and/or succinic diacids and/or (ii) esters of isomers of adipic acid have advantages, including efficiency and low VOC.