Polyaspartic Ester Coatings Reducing Dialkyl Fumarate
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Solution Overview
Problem
Existing two-component polyurethane coating compositions based on polyaspartic esters often have inadequate tensile strength and tear propagation resistance due to high residual dialkyl fumarate content, which is difficult to reduce without compromising other properties like color or viscosity.
Innovation Solution
The development of two-component coating compositions with a polyaspartic ester mixture having a significantly reduced dialkyl fumarate content, ranging from 0.02% to 0.75% by weight, achieved through a special distillation process, which improves mechanical properties when used in combination with a polyisocyanate component and optional reactive and auxiliary components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polyaspartic esters are prepared using maleic ester and stored for maturation, then the dialkyl fumarate content decreases, but the storage time required is 4-6 weeks which incurs significant logistics costs
Solution Approach 1:
The patent applies preliminary action by conducting a distillation process during the production phase to remove dialkyl fumarate before the maturation storage period. This preliminary removal action eliminates the need for extended storage time, as the harmful substance is already removed at the production stage rather than waiting for natural degradation during storage.
Solution Approach 2:
The patent applies the extraction principle by using distillation to separate and remove dialkyl fumarate from the polyaspartic ester mixture during production. This extraction process directly eliminates the harmful component without requiring long-term storage, thereby resolving the contradiction between reducing dialkyl fumarate content and minimizing storage time.
2Quantity of substance
If storage time is extended to reduce dialkyl fumarate content to approx. 1% by weight, then the dialkyl fumarate content decreases further, but other properties such as color or viscosity deteriorate
Solution Approach 1:
The patent applies extraction by using distillation to selectively remove dialkyl fumarate from the polyaspartic ester mixture during production. This targeted removal achieves low dialkyl fumarate content without requiring extended storage that would otherwise be needed, thereby preserving the color and viscosity properties of the final product.
Solution Approach 2:
The patent applies parameter changes by controlling the distillation process parameters (temperature, pressure, duration) to selectively remove dialkyl fumarate while maintaining the integrity of other product properties. By adjusting these parameters, the process achieves effective removal of the harmful substance without subjecting the polyaspartic ester to conditions that would degrade its color or viscosity.
3Strength
If polyaspartic esters with reduced dialkyl fumarate content are used, then tensile strength and tear propagation resistance improve, but a special distillation process is required which increases production complexity
Solution Approach 1:
The patent applies extraction by implementing a distillation process that removes dialkyl fumarate during production. While this adds a production step, it enables the manufacture of polyaspartic esters with significantly reduced dialkyl fumarate content, which directly translates to improved tensile strength and tear propagation resistance in the final coatings.
Solution Approach 2:
The patent applies parameter changes by optimizing the distillation process parameters to achieve effective dialkyl fumarate removal within a reasonable production timeframe. By controlling temperature, pressure, and distillation duration, the process balances the added production complexity with the significant improvement in mechanical properties of the final product.
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 reduced dialkyl fumarate content in the polyaspartic ester mixtures results in coatings with enhanced tensile strength and tear propagation resistance, making them suitable for high mechanical stress applications such as industrial floors and wind turbine components.
Implementation Method 1
achieved through a special distillation process
Data Source
AI summary
The present invention relates to two-component coating systems containing polyaspartic acid esters with only small amounts of fumaric acid dialkyl esters, to a method for preparing same and their use for producing coatings for use in construction and wind energy. An example for the use of these systems is for coating roofs, for coating floorings and for coating rotor blades of wind turbines, or the leading edges of their rotor blades.