Acetoacetyl-Functional Polyester for Formaldehyde Scavenging
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Solution Overview
Problem
Existing UV-curable coating compositions for wood products may contain formaldehyde, which can be released into the environment, and there is a need for formaldehyde-scavenging components suitable for use in these compositions.
Innovation Solution
A curable resin composition is developed, comprising an acetoacetyl-functional unsaturated polyester with a branched molecular skeleton and olefinically unsaturated functional groups, which can scavenge free formaldehyde and polymerize with other components without impacting the coating's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If UV-curable coating compositions are used to decorate and protect wood surfaces, then excellent product performance and environmental compatibility are achieved, but formaldehyde is released into the environment due to degradation of organic components
Solution Approach 1:
The patent introduces a formaldehyde-scavenging agent that reacts with free formaldehyde in advance during the coating formulation stage. The agent is pre-mixed with the UV-curable coating composition, so that when formaldehyde is generated from degradation of organic components, it is immediately scavenged by the active methylene groups in the formulation, preventing its release into the environment while maintaining coating performance
Solution Approach 2:
The formaldehyde-scavenging agent acts as an intermediary substance between the degrading organic components and the environment. It contains active methylene groups that specifically react with and bind formaldehyde molecules, converting the harmful formaldehyde into non-volatile adducts. This intermediary mechanism allows the coating to maintain its protective function while eliminating formaldehyde release
2Object-affected harmful factors
If small molecules with active methylene groups are added to scavenge formaldehyde, then formaldehyde scavenging capability is improved, but the compounds are not well suited for use in UV curable coating compositions
Solution Approach 1:
The patent modifies the parameters of the formaldehyde-scavenging compound by selecting specific molecules with appropriate molecular weights, functional groups, and reactivity characteristics. The chosen compounds have active methylene groups that are sufficiently reactive to scavenge formaldehyde but stable enough to be compatible with UV curable coating systems. The concentration of the scavenging agent is also optimized to achieve effective formaldehyde removal without interfering with the UV curing process
Solution Approach 2:
The patent creates a composite coating formulation that combines UV-curable resin components with formaldehyde-scavenging agents containing active methylene groups. This composite material integrates the dual functions of UV curability and formaldehyde scavenging into a single coating system, where the scavenging agent is dispersed and distributed throughout the coating matrix, allowing both functions to operate synergistically without compromising either property
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 acetoacetyl-functional unsaturated polyester effectively scavenges formaldehyde, maintaining this capability even after the coating is cured, thereby reducing formaldehyde levels in the environment.
Implementation Method 1
the acetoacetyl functional groups chemically bonded to the branched molecular skeleton
Implementation Method 2
containing olefinically unsaturated functional groups therein... which can scavenge free formaldehyde and polymerize with other components
Data Source
AI summary
A curable resin composition includes an acetoacetyl functional unsaturated polyester that includes a branched molecular skeleton containing olefinically unsaturated functional groups therein and acetoacetyl functional groups chemically bonded to the branched molecular skeleton. The acetoacetyl functional unsaturated polyester contains at least 2 wt% of the olefinically unsaturated functional groups, relative to the total weight of the acetoacetyl functional unsaturated polyester. The acetoacetyl functional unsaturated polyester contains at least 20 wt% of the acetoacetyl functional groups, relative to the total weight of the acetoacetyl functional unsaturated polyester. The curable resin composition can be used to formulate coating compositions.