Biobased Urethane Methacrylate Coating for Outdoor Cladding
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Solution Overview
Problem
There is a need for coating compositions that are at least partially biobased and offer mechanical and weathering resistance suitable for outdoor applications, as existing green materials fail to meet these demanding specifications.
Innovation Solution
The development of radiation curable and at least partially biobased urethane (meth)acrylates, obtained from the reaction of a polyisocyanate compound with a biobased carbon content of at least 20% and a (meth)acrylate compound, specifically designed for use in coating compositions for outdoor surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If green materials are used for outdoor coatings, then environmental friendliness is improved, but mechanical and weathering resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining biobased polyol with fossil-based polyisocyanate and (meth)acrylate compounds to create a hybrid urethane (meth)acrylate system. This composite approach allows the coating to achieve both environmental friendliness from the biobased content and adequate mechanical/weathering resistance from the synergistic combination of materials, resolving the contradiction between green credentials and performance requirements for outdoor applications
Solution Approach 2:
The patent changes the chemical composition parameters by specifying a biobased content of at least 5 wt% (preferably 10-80 wt%) of biobased polyol in the urethane (meth)acrylate. This parameter adjustment allows the coating to maintain environmental friendliness while achieving sufficient mechanical and weathering resistance through optimized formulation, directly addressing the contradiction between green materials and performance
2Ease of manufacture
If ether bounds are used in polymeric products, then ease of manufacture is improved, but UV stability deteriorates
Solution Approach 1:
The patent extracts or removes the problematic ether bounds from the polymer structure by using alternative linkages in the urethane (meth)acrylate formulation. This eliminates the UV instability associated with ether bonds while maintaining ease of manufacture through the use of standard polyol and polyisocyanate chemistry, resolving the contradiction between manufacturing simplicity and UV stability
3Object-generated harmful factors
If radiation curable urethane (meth)acrylates with high biobased content are developed, then environmental friendliness is improved, but meeting demanding outdoor specifications becomes more difficult
Solution Approach 1:
The patent optimizes the biobased content parameter within a specific range (at least 5 wt%, preferably 10-80 wt%) to balance environmental friendliness with performance. This parameter control ensures the coating meets demanding outdoor specifications for mechanical and weathering resistance while maintaining high environmental friendliness, resolving the contradiction between green credentials and specification compliance
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 proposed solution provides a coating composition that is not only environmentally friendly due to its biobased content but also offers excellent mechanical and weathering resistance, making it suitable for long-term protection of outdoor surfaces.
Implementation Method 1
obtained from the reaction of at least the following compounds: a polyisocyanate compound and b. A (meth)acrylate compound, different from compound a, and containing a reactive group capable to react with isocyanate groups
Implementation Method 2
radiation curable and at least partially biobased urethane (meth)acrylates... comprising the step of reacting together... a process for curing an urethane (meth)acrylate... comprising exposing the urethane (meth)acrylate or the composition to one or more of the following: electron beam or UV radiation
Data Source
AI summary
A radiation curable and at least partially biobased urethane (meth)acrylate for use in a one-component coating composition for cladding an outdoor surface of a building, obtained from the reaction of at least the following compounds: a. a polyisocyanate compound having a biobased carbon content of at least 20%, preferably at least 50%, as determined by method A of the standard ASTM D6866-12:2008, and b. a (meth)acrylate compound, different from compound a, and containing a reactive group capable to react with isocyanate groups.