Coating Additive Copolymer for Formaldehyde Abatement
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Solution Overview
Problem
The use of acetoacetoxy or acetoacetamide functional monomers in coating binders limits their effectiveness due to polymerization techniques, restricting their application, and it is surprising that these monomers exhibit higher effectiveness when added as coating additives rather than through binders.
Innovation Solution
A coating additive (co)polymer comprising 20% to 60% acetoacetoxy or acetoacetamide functional ethylenically unsaturated monomers and 40% to 80% water-soluble ethylenically unsaturated monomers, such as N-hydroxymethyl (meth)acrylamide or sodium p-styrenesulfonate, which can be added separately to the coating formulation at higher than 0.04% by dry weight, enhancing formaldehyde abatement effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acetoacetoxy or acetoacetamide functional monomers are polymerized in coating binders, then the coating achieves cross-linking and chemical resistance, but the effectiveness of formaldehyde abatement is limited
Solution Approach 1:
The invention segments the coating system into separate functional components: the coating binder provides base film formation and protection, while the coating additive separately provides acetoacetoxy-functional monomers for formaldehyde abatement. This segmentation allows each component to optimize its specific function without the limitations of traditional binder-based polymerization.
Solution Approach 2:
The acetoacetoxy-functional monomers are extracted from the binder polymerization process and placed into a separate coating additive. This extraction enables the monomers to be added post-polymerization, avoiding the technical limitations of polymerizing these sensitive monomers within the binder system while maintaining their formaldehyde-reactive functionality.
2Quantity of substance
If higher loading of acetoacetoxy functional monomers is used in binder-based coatings, then formaldehyde abatement capacity increases, but the coating formulation complexity and manufacturing difficulty increase
Solution Approach 1:
The acetoacetoxy-functional monomers are pre-synthesized and stabilized in the coating additive at controlled concentrations. This preliminary preparation allows the monomers to be stored and handled separately before being added to the final coating formulation, avoiding the need to manage high loadings of reactive monomers during binder manufacturing.
Solution Approach 2:
The coating additive serves as an intermediary vehicle that delivers controlled amounts of acetoacetoxy-functional monomers to the coating formulation. This intermediary approach simplifies manufacturing by decoupling the monomer delivery function from the binder synthesis process, allowing independent optimization of both 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 separate addition of acetoacetoxy or acetoacetamide functional monomers in the coating additive significantly improves formaldehyde abatement effectiveness, allowing for lower loadings in the coating formulation while maintaining or exceeding the effectiveness of traditional binder-based compositions.
Implementation Method 1
acetoacetoxy functionality can also be employed to react with formaldehyde
Data Source
AI summary
The present invention provides a coating additive (co) polymer comprising, as (co) polymerized units, by dry weight based on total dry weight of the (co) polymer, from 20％to 60％, at least one acetoacetoxy or acetoacetamide functional ethylenically unsaturated monomer, and from 40％to 80％at least one water soluble ethylenically unsaturated monomer. It further provides a coating formulation comprising higher than 0.04％by dry weight based on total dry weight of the coating formulation, the acetoacetoxy or acetoacetamide functional ethylenically unsaturated monomer.