Modified Polyamide Wax Dispersion in Water-Based Coatings
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Solution Overview
Problem
Existing polyamide waxes used in water-based coatings face challenges with dispersion, anti-settling, and anti-sagging properties due to their hydrophobic chain structure and low molecular weight, which affects their performance and stability in coatings.
Innovation Solution
A modified polyamide wax preparation process involving physical compounding, chemical modification, and solid content control, using specific ratios of water-based polyamide wax, polyurethane, polyoxyethylene monostearate, composite modifiers, organic amine, organic solvent, and deionized water, to enhance dispersibility, thermal stability, and anti-settling and anti-sagging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamide wax is used as a rheological additive to improve thixotropic properties and anti-sag performance, then the coating system gains excellent thickening and anti-settling effects, but the hydrophobic chain structure makes it difficult to disperse effectively in water-based coatings
Solution Approach 1:
The patent modifies the polyamide wax by changing its chemical parameters - introducing hydrophilic groups through reaction with polyethylene polyol and other modifiers. This transforms the originally hydrophobic polyamide wax into a modified version with balanced hydrophilicity and hydrophobicity, enabling effective dispersion in water-based coatings while maintaining anti-sag performance.
Solution Approach 2:
The patent creates a composite modified polyamide wax by combining polyamide wax with polyethylene polyol and other modifiers. This composite structure integrates the thixotropic properties of polyamide wax with the hydrophilic characteristics of polyethylene polyol, achieving both good dispersion in water-based systems and effective anti-sag performance.
2Stability of the object's composition
If the degree of polymerization is reduced to increase hydrophilicity and dispersion capability, then the polyamide wax disperses better in aqueous systems, but the low molecular weight results in poor crystallization performance and unstable crystal structure
Solution Approach 1:
The patent optimizes the molecular weight parameters of the modified polyamide wax to achieve a balance between hydrophilicity and crystallization performance. By controlling the degree of polymerization and molecular weight distribution during synthesis, the patent creates a modified polyamide wax with sufficient hydrophilicity for good dispersion while maintaining adequate molecular weight for stable crystal structure and anti-sag performance.
3Stability of the object's composition
If high acid value material is used to improve hydrophilic properties and dispersion, then the material disperses well in water-based coatings, but the low molecular weight leads to poor anti-settling and anti-sag properties
Solution Approach 1:
The patent creates a composite modified polyamide wax that combines the dispersibility benefits of high acid value materials with the anti-sag performance of appropriately molecular weight polyamide structures. The composite formulation includes polyamide wax, polyethylene polyol, and other modifiers in specific ratios that achieve both good dispersion and effective anti-settling performance.
Solution Approach 2:
The patent introduces local hydrophilic modifications to specific regions of the polyamide wax molecule while maintaining the overall molecular structure needed for anti-sag performance. This local quality approach allows the material to have both good dispersion capability and adequate anti-settling properties.
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 modified polyamide wax exhibits improved dispersibility, thermal stability, and anti-settling and anti-sagging properties, effectively preventing pigment and filler sedimentation and reducing sagging in coatings, while also enhancing the efficiency and safety of the preparation process.
Implementation Method 1
adding an organic amine, an organic solvent and a second composite modifier to the first complex to mix uniformly, and the temperature is raised to 100-120° C. until the water-based polyamide wax is completely dissolved
Implementation Method 2
Polyamide wax, which is usually used as a rheological additive, is an excellent thixotropic additive, which can better balance the anti-sag and leveling properties of the coating film, impart high thixotropic properties to the coating system
Implementation Method 3
the polyamide wax material is generally given a higher acid value, which requires reducing the degree of polymerization of the polycondensation reaction during synthesis; this low molecular weight, high acid value material has excellent hydrophilic properties
Data Source
AI summary
The invention relates to a preparation process of a modified polyamide wax for coatings and a formed coating. The coating includes 0.5-5 parts by weight of modified polyamide wax; the preparation process of the modified polyamide wax for coating includes the following steps: S1, ratio of raw materials:raw materials include water-based polyamide wax, water-based polyurethane, polyoxyethylene monostearate, the first composite modifier, organic amine, organic solvent, the second composite modifier, deionized water; S2, prepare the first complex; S3, add organic amine, organic solvent and the second composite modifier is evenly mixed, and the temperature is raised to 100-120° C. until the water-based polyamide wax is completely dissolved to obtain the first intermediate modifier; S4, deionized water is heated up and slowly added to the first intermediate modifier in the process. The coating system prepared by the invention has good leveling, stability and sag resistance.