Biobased Aqueous Coating Dispersion for Stain and Freeze-Thaw Stability
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Solution Overview
Problem
Aqueous coating compositions with biobased binders face challenges in achieving comparable freeze-thaw stability, stain resistance, and anti-clogging properties to conventional coatings, with existing formulations often resulting in poor performance and coagulum formation during polymerization.
Innovation Solution
An aqueous dispersion comprising an emulsion polymer with specific monomer ratios of soft alkyl (meth)acrylates, C8-C16-alkyl (meth)acrylates, acetoacetoxy or acetoacetamide functional monomers, functional-group-containing monomers, hard acrylic monomers, and (meth)acryl or epoxy functional silanes, which provides improved balance in stain resistance, freeze-thaw stability, and anti-clogging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biobased binders are used in aqueous coating compositions, then environmental sustainability is improved, but freeze-thaw stability deteriorates
Solution Approach 1:
The patent uses a composite emulsion polymer system combining multiple monomer types (soft alkyl (meth)acrylates, C8-C16-alkyl (meth)acrylates, acetoacetoxy or acetoacetamide functional monomers, ethylenically unsaturated monomers with functional groups, hard acrylic monomers, and (meth)acryl functional silanes) to achieve both biobased content requirements and freeze-thaw stability. This composite approach allows the binder to maintain structural integrity through freeze-thaw cycles while meeting sustainability goals.
Solution Approach 2:
The patent optimizes specific parameter ranges including soft alkyl (meth)acrylate content (30-80%), C8-C16-alkyl (meth)acrylate content (5-30%), acetoacetoxy or acetoacetamide functional monomer content (0.1-10%), and silane content (0.05-3% combined) to achieve the desired balance between biobased content and freeze-thaw stability. These parameter adjustments enable the coating to withstand environmental conditions while maintaining sustainability.
2Reliability
If biobased binders are used in aqueous coating compositions, then environmental sustainability is improved, but stain resistance deteriorates
Solution Approach 1:
The patent incorporates multiple functional monomer components including hard acrylic monomers (0-50%) for structural rigidity and stain resistance, combined with biobased soft alkyl (meth)acrylates for sustainability. The synergistic interaction between these components creates a coating film that resists staining while maintaining environmental credentials.
Solution Approach 2:
The patent assigns different functional roles to different monomer components within the emulsion polymer. Hard acrylic monomers provide localized stain resistance properties, while biobased soft alkyl (meth)acrylates provide sustainability and flexibility. This functional differentiation within the composite polymer structure achieves both objectives simultaneously.
3Reliability
If biobased binders are used in aqueous coating compositions, then environmental sustainability is improved, but anti-clogging properties deteriorate
Solution Approach 1:
The patent adjusts the molecular weight, glass transition temperature, and compositional parameters of the emulsion polymer to optimize anti-clogging properties. Specifically, the controlled incorporation of hard acrylic monomers and functional silanes modifies the polymer chain flexibility and interparticle interactions, preventing brush clogging during application while maintaining biobased content requirements.
Solution Approach 2:
The patent creates a polymer system with dynamic mechanical properties that adapt to application conditions. The emulsion polymer exhibits appropriate viscosity and flow characteristics during brushing that prevent clogging, while maintaining the required biobased content through the specified monomer composition ranges.
4Ease of manufacture
If large amounts of coagulum are formed during polymerization, then polymerization process is simplified, but freeze-thaw stability deteriorates
Solution Approach 1:
The patent carefully controls polymerization parameters including monomer feed rates, temperature profiles, and initiator concentrations to minimize coagulum formation. The specified monomer composition ranges and the use of emulsion polymerization techniques enable controlled polymerization that produces uniform particles without excessive coagulum, thereby maintaining freeze-thaw stability while keeping the manufacturing process feasible.
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 described aqueous dispersion enhances the biobased binder's performance, achieving good freeze-thaw stability, anti-clogging resistance, and high stain resistance scores, while maintaining a low level of coagulum and high biobased content, suitable for various coating applications.
Implementation Method 1
an emulsion polymer comprising, by weight based on the weight of the emulsion polymer
Implementation Method 2
improved balance in stain resistance, freeze-thaw stability and anti-clogging properties
Implementation Method 3
from zero to 3% of structural units of a (meth)acryl functional silane; and from zero to 3% of an epoxy functional silane
Data Source
AI summary
The present invention provides an aqueous dispersion as a biobased binder and an aqueous coating composition comprising such aqueous dispersion and showing balanced stain resistance, freeze-thaw stability, and anti-clogging properties.