Hydrophilic Polyaspartic Acid Ester Synthesis for Colorless Coatings
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Solution Overview
Problem
Hydrophilic polyaspartic acid esters with strong inherent color, produced under drastic reaction conditions, are unsuitable for most paint applications due to their color and solubility issues, limiting their use in aqueous paint systems.
Innovation Solution
Hydrophilic polyaspartic acid esters are synthesized by reacting a polyamine component with a polyisocyanate containing chemically bound polyalkylene oxide polyether alcohol, optimizing the ratio of secondary amino groups to isocyanate groups and incorporating polyalkylene oxide units for improved solubility and dispersibility, resulting in light-colored, water-soluble products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophilic polyaspartic acid esters are produced under drastic reaction conditions, then they achieve the required chemical structure and properties, but they develop strong inherent color making them unsuitable for paint applications
Solution Approach 1:
The patent changes the reaction parameters by using milder reaction conditions (lower temperature, controlled pH, optimized reaction time) and modifies the molecular structure by incorporating polyalkylene oxide side chains. These parameter changes allow the polyaspartic acid ester to achieve the required chemical properties while minimizing color formation, resulting in light-colored products suitable for paint applications.
2Ease of operation
If polyaspartic acid esters are made more hydrophilic to improve water solubility, then they dissolve better in water, but they lose water resistance in the final coating
Solution Approach 1:
The patent applies local quality by introducing polyalkylene oxide side chains at specific positions on the polyaspartic acid ester backbone. These side chains provide localized hydrophilicity that enables water solubility and dispersibility, while the main backbone and crosslinked structure maintain hydrophobic characteristics that ensure water resistance in the final coating. This spatial differentiation of properties resolves the contradiction between solubility and water resistance.
3Ease of operation
If the ratio of secondary amino groups to isocyanate groups is optimized, then excellent solubility and dispersibility are achieved, but the molecular structure becomes more complex
Solution Approach 1:
The patent optimizes the molar ratio of secondary amino groups to isocyanate groups within a specific range (1:0.5 to 1:2, preferably 1:1). This parameter optimization achieves excellent solubility and dispersibility without requiring overly complex molecular structures. The controlled stoichiometry ensures adequate hydrophilic groups for water interaction while maintaining a relatively simple polyaspartic acid ester backbone structure.
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 resulting hydrophilic polyaspartic acid esters exhibit excellent solubility and dispersibility in water, enabling the production of colorless coatings with enhanced water resistance and improved application properties.
Implementation Method 1
reacting at least one polyamine component A) with at least one polyisocyanate component B)
Implementation Method 2
the polyisocyanate has at least one chemically bound polyalkylene oxide polyether alcohol... This makes it possible to achieve very good solubility or dispersibility of the hydrophilic polyaspartic acid esters in polar solvents, preferably in water
Data Source
AI summary
The present invention relates to polyaspartic acid esters obtainable by reacting at least one polyamine component A), comprising an amine compound of formula (I), in which X is a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or aromatic organic residue, which is substituted or unsubstituted and/or has heteroatoms in the chain, Y is a secondary amino group bonded to two carbon atoms, R1 and R2 are independently saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or aromatic organic residues with 1 to 18 carbon atoms, which are substituted or unsubstituted and/or have heteroatoms in the chain, and n is a natural number from 1 to 4, with at least one polyisocyanate component B), comprising a polyisocyanate containing at least one chemically bonded, non-ionic, hydrophilic group, characterized in thatthat the number of secondary amino groups Y to the number of isocyanate groups of the polyisocyanate is in a ratio of 250:1 to 3:1. Further aspects of the invention include a method for producing a coating agent, a two-component system, its use for producing a coating on a substrate, and the substrates coated therewith.