In-situ Polyurethane-Isocyanurate Dispersion for Thixotropic Polyol
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Solution Overview
Problem
Existing thixotropic agents for coatings, sealants, and adhesives are costly, difficult to manufacture, and can cause issues like settling, exudation, and changes in physical properties due to their separate production and incorporation into formulations, leading to inefficiencies and inconsistencies.
Innovation Solution
A thixotropic dispersion of polyurethane-isocyanurate particles is formed in situ within a liquid base polyol by reacting a low equivalent weight polyol with polyisocyanate compounds in the presence of an isocyanate trimerization catalyst, eliminating the need for separate manufacturing and incorporation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate thixotropic agents are incorporated into formulations, then thixotropic behavior is achieved, but manufacturing costs increase and manufacturing complexity increases
Solution Approach 1:
The patent combines the thixotropic agent functionality with the polyol component itself. The polyol is formulated to contain dispersed polyurethane-isocyanurate particles that provide thixotropic behavior, eliminating the need for separate thixotropic agent additives. This integration reduces manufacturing steps and costs while maintaining the desired rheological properties.
Solution Approach 2:
The polyol serves multiple functions: it acts as both the base polymer component and the thixotropic agent. The dispersed polyurethane-isocyanurate particles within the polyol provide thixotropic behavior, making the polyol itself a multi-functional material that eliminates the need for separate additive incorporation.
2Reliability
If separate thixotropic agents are incorporated into formulations, then thixotropic behavior is achieved, but device complexity and processing steps increase
Solution Approach 1:
The patent merges the thixotropic functionality into the polyol manufacturing process itself. The polyol is produced with dispersed polyurethane-isocyanurate particles already incorporated, eliminating separate mixing and incorporation steps that would be required if traditional thixotropic agents were used.
3Reliability
If particulate thixotropic agents are used, then thixotropic behavior is achieved, but settling and exudation problems occur
Solution Approach 1:
The patent creates a localized stable dispersion of polyurethane-isocyanurate particles within the polyol matrix. The particles are dispersed at a molecular level within the polyol structure, creating local regions of stable distribution that prevent settling and exudation while maintaining thixotropic behavior.
Solution Approach 2:
The patent creates a composite structure where polyurethane-isocyanurate particles are dispersed within the polyol matrix. This composite material structure provides both the thixotropic behavior of particulate agents and the stability of a integrated formulation, preventing the settling and exudation problems associated with simple particulate suspensions.
4Reliability
If urea thixotropic agents are used, then thixotropic behavior is achieved, but manufacturing cost and difficulty increase due to high reactivity requirements
Solution Approach 1:
The patent uses readily available polyol and polyisocyanate components that can be easily manufactured and handled, replacing expensive and difficult-to-manufacture urea thixotropic agents. The polyol-based thixotropic system uses standard industrial chemicals with well-established handling procedures.
Solution Approach 2:
The patent changes the chemical basis of the thixotropic agent from urea compounds to polyol-based polyurethane-isocyanurate dispersions. This parameter change in the chemical composition eliminates the need for high-reactivity amine materials and complex synthesis conditions required for traditional urea thixotropic agents.
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
This approach significantly reduces manufacturing costs and avoids issues related to settling and exudation, while imparting effective thixotropic behavior to the dispersion, ensuring improved viscosity recovery and stability under shear conditions.
Implementation Method 1
reacting a low equivalent weight polyol with polyisocyanate compounds in the presence of an isocyanate trimerization catalyst to form polyurethane-isocyanurate particles dispersed in the base polyol
Implementation Method 2
reacting a low equivalent weight polyol with polyisocyanate compounds in the presence of an isocyanate trimerization catalyst
Implementation Method 3
A thixotropic material is one that exhibits a large reversible reduction in viscosity when placed under applied shear
Data Source
AI summary
Thixotropic polyol dispersions are described. The dispersions contain a dispersed phase of polyurethane-isocyanurate particles. They can be made by reacting a low equivalent weight polyol with a polyisocyanate in the presence of an isocyanate trimerization catalyst while dispersed in a base polyol. These polyol dispersions are useful as the resin component of curable systems such as formulated coatings, sealants or adhesives.