Acrylic Copolymer Formaldehyde Scavenging via Acetoacetyl Groups
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Solution Overview
Problem
Current formaldehyde scavenging agents in aqueous coating compositions are expensive and have insufficient formaldehyde scavenging efficiency, and multifunctional amine compounds used for this purpose are unstable in air and adversely affect paint performance.
Innovation Solution
A water dispersible acrylic copolymer with acetoacetyl functional groups and hydrophilic groups chemically bonded to its molecular backbone, produced through emulsion polymerization, is used to create an aqueous dispersion with enhanced formaldehyde scavenging properties, suitable for various coating compositions without affecting their performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emulsions with formaldehyde scavenging functions (e.g., SF-506, 33014 from DOW) are used, then formaldehyde scavenging function is provided, but the cost is high and formaldehyde scavenging efficiency is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the copolymer by controlling the content of acetoacetyl functional groups (10-30 wt%) and hydrophilic groups (0.1-15 wt%) to optimize formaldehyde scavenging efficiency while maintaining cost-effectiveness through emulsion polymerization
Solution Approach 2:
The patent creates a composite copolymer structure combining acetoacetyl functional groups (for formaldehyde scavenging) with hydrophilic groups (for water dispersibility), achieving both high scavenging efficiency and low cost through synergistic material design
2Reliability
If multifunctional amine compounds are used as formaldehyde scavenging agents, then formaldehyde scavenging function is provided, but the compounds are unstable in air and have low formaldehyde scavenging efficiency
Solution Approach 1:
The patent replaces unstable amine compounds with a stable copolymer structure that provides durable formaldehyde scavenging function without degradation in air, effectively using a long-lasting alternative to short-lived amine agents
3Reliability
If multifunctional amine compounds are used as formaldehyde scavenging agents, then formaldehyde scavenging function is provided, but they adversely affect the performance of the paint
Solution Approach 1:
The patent converts the potential harm of amine compounds (instability and paint performance degradation) into benefit by using a stable copolymer structure that provides formaldehyde scavenging without negative side effects, turning the search for stable alternatives into a successful material design
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 acrylic copolymer-based aqueous dispersion exhibits excellent formaldehyde scavenging efficiency, is cost-effective, and can be used in a wide range of applications without compromising the properties of the coating compositions, including improved mechanical properties and reduced formaldehyde content.
Implementation Method 1
acrylic copolymer comprising one or more acetoacetyl functional groups... excellent formaldehyde scavenging properties
Implementation Method 2
one or more hydrophilic groups chemically bonded to its molecular backbone... water dispersible acrylic copolymer
Implementation Method 3
the particles are prepared through emulsion polymerization using monomers comprising
Data Source
AI summary
The present invention is a water dispersible copolymer for scavenging formaldehyde, the copolymer being based on acrylic copolymer comprising one or more acetoacetyl functional groups and one or more hydrophilic groups chemically bonded to its molecular backbone, wherein the acrylic copolymer has a number average molecular weight of 2000-100,000 g/mol; and wherein the acrylic copolymer comprises between 10 wt% and 30 wt% of the acetoacetyl functional groups relative to the weight of the acrylic copolymer. The present invention also refers to an aqueous dispersion containing said water dispersible copolymer, as well as an article coated by a coating comprising the aqueous dispersion.