Polyester-Modified Polyamine Dispersing Resins for Pigment Stability
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Solution Overview
Problem
Existing dispersing resins for solids in liquid media often require high levels of additives, leading to unsatisfactory pigmentation, stability, and viscosity issues, as well as compatibility problems with binders and pigments, which can affect the water resistance and light resistance of coating materials, and may cause undesirable foam formation.
Innovation Solution
Development of dispersing resins with a specific formula (T-P-Z-T) comprising polyester units based on di- or polycarboxylic acids and di- or polyols, which are produced using a process involving condensation and subsequent reaction with dicarboxylic acids or their anhydrides, and combined with polyallylamines or polyethyleneimines, to achieve improved dispersing performance without increasing viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of dispersing additives are used, then dispersion stability is improved, but pigmentation levels become unsatisfactorily low and viscosity increases
Solution Approach 1:
The patent changes the chemical parameters of the dispersing resin by using polyester-modified polyamines with specific molecular weights and functional group ratios. This modifies the interaction mechanism between dispersant and pigment particles, achieving stable dispersion at lower additive levels without sacrificing pigmentation
Solution Approach 2:
The invention creates a composite structure by combining polyester chains with polyamine functional groups. This composite molecular architecture provides both steric stabilization (from polyester) and electrostatic stabilization (from polyamine), enabling effective dispersion at reduced additive concentrations
2Reliability
If dispersing resins are used to stabilize solids, then reagglomeration is prevented, but compatibility problems with binders and pigments occur affecting water resistance and light resistance
Solution Approach 1:
The dispersing resin exhibits local quality through its amphiphilic structure: polyester segments provide hydrophobic interaction with non-polar binders and pigment surfaces, while polyamine segments provide hydrophilic character for water resistance. This localized functionality enables simultaneous compatibility with diverse components
Solution Approach 2:
By adjusting the molecular weight and functional group density of the polyamine component, the patent optimizes the balance between steric stabilization and electrostatic repulsion. This parameter optimization ensures compatibility across different pigment types and binder systems while maintaining dispersion stability
3Ease of operation
If conventional dispersing resins are used, then solids are dispersed, but undesirable foam is formed
Solution Approach 1:
The patent converts the typically harmful foam-forming property of polyamines into a beneficial feature by carefully selecting molecular weight and functional group density. The modified polyamine structure provides sufficient amphiphilicity for dispersion while reducing excessive surface activity that causes foam, effectively transforming a potential harm into a controlled benefit
4Use of energy by moving object
If dispersing resins are used to reduce mechanical shear forces, then energy consumption is reduced, but gloss is undesirably impaired due to lack of compatibility
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polyester component to achieve the right balance between steric stabilization (reducing shear forces) and optical properties (maintaining gloss). By controlling chain length and flexibility, the dispersant provides adequate particle separation without excessive viscosity increase that would impair gloss
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 new dispersing resins enable reduced usage of high-priced pigments while maintaining color strength, achieve Newtonian viscosity behavior, and are based on inexpensive, commercially available raw materials, providing enhanced stability and compatibility with various coating materials.
Implementation Method 1
Components of the dispersing resins of the formula (I) according to the invention are polyester units P based on di- or polycarboxylic acids and di- or polyols... which in a subsequent reaction are further partially or completely with z. B. anhydrides can be converted into carboxy functional polyesters
Implementation Method 2
As surface-active materials, the dispersing resins wet and/or coat the surface of the particles to be dispersed and stabilize them against undesirable reagglomeration
Data Source
AI summary
The invention relates to novel dispersing resins, to the production thereof and use thereof for dispersing solids.