Aqueous Coating Composition Using Calcium Crosslinking
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Solution Overview
Problem
Existing aqueous coating compositions using calcium or magnesium as ionic crosslinkers fail to meet commercial needs in terms of performance properties.
Innovation Solution
An aqueous coating composition comprising a polymer with calcium ions, specific weight percentages of phosphoethyl methacrylate, methacrylic acid, ethylenically unsaturated crosslinkers, and vinyl aromatic monomers, optimized for a midpoint Tg of 60-100°C, which provides improved performance as a floor finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If calcium or magnesium ions are used as ionic crosslinkers in aqueous coating compositions, then environmental acceptability is improved, but performance properties (gloss retention, water resistance, durability) deteriorate compared to traditional zinc crosslinkers
Solution Approach 1:
The patent changes the chemical parameters of the polymer by incorporating phosphoethyl methacrylate monomer units with specific phosphonate groups that have optimized binding affinity for calcium ions. This parameter change allows the polymer to form stronger ionic crosslinks with calcium, compensating for the generally weaker crosslinking ability of calcium compared to zinc, thereby improving gloss retention and water resistance while maintaining environmental acceptability.
Solution Approach 2:
The patent creates a composite polymer structure combining multiple monomer types including phosphoethyl methacrylate (providing calcium binding), methacrylic acid (providing crosslinking sites), and vinyl aromatic monomers (providing structural backbone). This composite approach allows the material to simultaneously achieve environmental acceptability through calcium crosslinking and improved performance through optimized polymer architecture and multiple functional groups.
2Object-affected harmful factors
If the polymer composition is optimized for calcium crosslinking, then environmental friendliness is improved, but manufacturing complexity increases due to precise monomer ratio requirements
Solution Approach 1:
The patent establishes specific parameter ranges for monomer composition (phosphoethyl methacrylate: 1-6 wt%, methacrylic acid: 6-13 wt%, vinyl aromatic monomers: 25-45 wt%) that, when followed, reliably produce polymers with optimal calcium crosslinking performance. By defining these precise parameter ranges during manufacturing, the process becomes more controllable and less complex, as operators simply need to maintain these specifications rather than perform complex real-time optimizations.
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 composition achieves enhanced gloss retention, tack-free time, water resistance, and durability, outperforming prior art compositions in accelerated wear testing and real-world applications.
Implementation Method 1
aqueous coating compositions using calcium or magnesium as ionic crosslinkers
Implementation Method 2
phosphoethyl methacrylate; from 1 to 6 wt% of a complexing monomer that is phosphoethyl methacrylate
Data Source
AI summary
An aqueous coating composition containing a polymer which contains calcium or magnesium and polymerized residues of three monomers. The first monomer is a complexing monomer having a log stability constant for calcium or magnesium from 0.3 to 4. The second monomer is methacrylic acid. The third monomer is a crosslinker.