One-Component Amino Resin Coating with Branched Polyester Polyol
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Solution Overview
Problem
Existing one-component amino resin coating compositions face challenges in achieving good chemical resistance, a suitable hardness-to-elasticity ratio, and quick drying, with known formulations often involving complex production processes, high viscosity issues, and compatibility problems with other paint components.
Innovation Solution
A one-component amino resin coating composition comprising at least one amino resin, a hydroxyl-containing polymer, a branched polyester polyol obtainable by polycondensation of hexahydrophthalic anhydride and trimethylolpropane, with a specific molar mixing ratio of hydroxyl groups and acid/hydroxyl groups, and optional additives for improved compatibility and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex multi-step hyperbranched polyesterol production processes are used, then chemical resistance improves, but manufacturing complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex multi-step production process (core formation, chain extension with polyhydroxycarboxylic acid, chain extension with polycarboxylic acid) by using a simplified branched polyesterol produced in a single polycondensation step from hexahydrophthalic anhydride and trimethylolpropane, while maintaining the essential chemical resistance properties
Solution Approach 2:
Instead of building up complex hyperbranched structures through multiple sequential steps, the invention inverts the approach by using a simpler branched polyesterol structure that achieves the desired performance with fewer synthesis steps, reversing the complexity-building paradigm
2Reliability
If high acid number polyesterols are used, then chemical resistance improves, but compatibility with other paint components deteriorates
Solution Approach 1:
The patent optimizes the acid number parameter to a specific range (20-80 mg KOH/g) that balances chemical resistance and compatibility. This parameter optimization allows the branched polyesterol to provide adequate chemical resistance while maintaining compatibility with amino resins and other paint components, resolving the contradiction between these two requirements
3Device complexity
If conventional polyesterol formulations are used, then formulation simplicity improves, but drying speed deteriorates
Solution Approach 1:
The patent modifies key parameters of the polyesterol including acid number (20-80 mg KOH/g), hydroxyl number (170-350 mg KOH/g), and molecular weight (500-5000 g/mol) to optimize drying speed. These parameter adjustments enable faster drying while maintaining formulation simplicity and avoiding complex multi-component systems
4Strength
If branched polyesterols with high crosslinking density are used, then hardness improves, but elasticity deteriorates
Solution Approach 1:
The patent optimizes the molecular weight (500-5000 g/mol) and functional group density of the branched polyesterol to achieve a balanced crosslinking density. This parameter optimization creates a coating film with adequate hardness from crosslinking while maintaining elasticity through appropriate molecular weight and branch structure, resolving the contradiction between hardness and elasticity
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 exhibits enhanced chemical resistance, a balanced hardness-to-elasticity ratio, and rapid drying, addressing the limitations of previous formulations while simplifying the production process and improving compatibility with other paint components.
Implementation Method 1
a branched polyester polyol, obtainable by polycondensation of hexahydrophthalic anhydride, trimethylolpropane
Implementation Method 2
quick drying
Implementation Method 3
at least one chemical crosslinker selected from the group consisting of blocked polyisocyanates, trisalkylcarbamoyltriazines, epoxy resins, resins containing carboxy groups and of amino resin
Data Source
AI summary
The invention relates to a one-component amino resin coating composition with a good resistance to chemicals, a good ratio of hardness to elasticity and quick drying, to the use thereof and to a method for coating. Said coating compounds contain as structural components amino resin, hydroxyl group-containing polymers as main polyols, and particular branched polyester polyols, obtainable by polycondensation of hexahydrophthalic acid anhydride, trimethylol propane, and optionally further components.