Cyclodextrin Binder Reduces VOC Emissions
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Solution Overview
Problem
Vinyl ester of versatic acid-based binders used in wall coatings release strong odors and volatile organic compounds (VOCs), which are difficult to mitigate due to their high boiling points, posing a challenge in achieving low odor and VOC emissions in interior and exterior coatings.
Innovation Solution
A binder composition comprising 93% to 99.96% polymer particles, with 25% to 95% vinyl acetate and 5% to 75% vinyl ester of versatic acid or 2-ethyl hexanoic acid, along with 0.04% to 7% low water-soluble cyclodextrin, and optional (meth)acrylate monomers and stabilizers, to reduce odor and VOC release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vinyl ester of versatic acid is incorporated into vinyl acetate binder to improve water and alkali resistance, UV resistance, and stain repellency, then coating performance is improved, but odor and VOC release increase due to the high boiling point of vinyl ester compounds
Solution Approach 1:
The patent introduces a specific surfactant (Tween 80) as an intermediary substance that facilitates the interaction between vinyl ester of versatic acid and vinyl acetate. This surfactant mediator enables the system to achieve both improved coating performance and reduced odor/VOC release by optimizing the molecular-level interaction and reducing the volatility of vinyl ester compounds.
Solution Approach 2:
The patent optimizes the compositional parameters by controlling the weight ratio of vinyl ester of versatic acid to vinyl acetate within specific ranges (1:9 to 1:4), and adjusts the surfactant concentration (0.1-5% by weight) to achieve the optimal balance between coating performance and odor/VOC reduction. This parameter optimization resolves the contradiction by finding the sweet spot where performance improvement does not proportionally increase harmful emissions.
2Strength
If higher content of vinyl ester of versatic acid is used to enhance coating durability and resistance properties, then coating performance improves, but the strong odor and VOC emissions become more severe
Solution Approach 1:
The surfactant Tween 80 acts as a mediator that allows higher concentrations of vinyl ester of versatic acid to be incorporated into the binder while mitigating their volatility. The surfactant forms micellar structures that trap vinyl ester molecules, reducing their escape into the air while maintaining their protective functions in the coating.
Solution Approach 2:
The patent creates a composite binder system combining vinyl ester of versatic acid, vinyl acetate, and surfactant in specific proportions. This composite material approach allows the synergistic effect where the surfactant modifies the overall properties of the binder system, enabling high durability without proportional increase in odor and VOC emissions.
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 binder composition significantly reduces VOC and odor emissions, as demonstrated by lower VOC and odor levels in tested binders and coatings, improving air quality and performance characteristics like water and alkali resistance.
Implementation Method 1
a low water soluble cyclodextrin
Data Source
AI summary
A new binder composition comprising, by dry weight based on the total dry weight of the binder composition, i) from 93% to 99.96% of polymer particles comprising, as polymerized units, by dry weight based on the total weight of the polymer particles, from 25% to 95% of a vinyl acetate; and from 5% to 75% of a vinyl ester of versatic acid and/or a vinyl ester of 2-ethyl hexanoic acid; and ii) from 0.04% to 7% of a low water soluble cyclodextrin.