Curable Precursor with Carbamate Thixotropy for Filler Stability
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Solution Overview
Problem
Curable compositions with inorganic fillers face challenges in maintaining flowability and storage stability while preventing sedimentation and separation, which affects their performance in applications requiring thermal conductivity or insulation.
Innovation Solution
A curable precursor comprising a radically (co)polymerizable (meth)acrylate-based component, a curing agent, an inorganic filler with a mean particle size of at least 1 µm, and a thixotropic carbamate agent, which allows for low viscosity and stable storage without sedimentation, enabling fast curing and maintaining mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a thixotropic agent is added to prevent sedimentation and separation of inorganic fillers, then storage stability is improved, but viscosity increases and flowability is reduced
Solution Approach 1:
The patent applies parameter changes by selecting a thixotropic agent (carbamate) with specific molecular weight and structural parameters that optimize the balance between storage stability and flowability. The carbamate's molecular characteristics allow it to provide thixotropic behavior at lower concentrations, reducing viscosity impact while maintaining filler suspension stability during storage.
Solution Approach 2:
The patent uses a composite approach by combining the carbamate thixotropic agent with the (meth)acrylate-based component and inorganic fillers to create a synergistic formulation. The carbamate interacts with both the polymer matrix and filler particles, providing dual functionality of preventing filler sedimentation while maintaining overall formulation flowability through its specific molecular structure and interaction mechanisms.
2Reliability
If inorganic fillers are used to provide thermal conductivity or insulation, then functional performance is improved, but sedimentation and separation occur during storage
Solution Approach 1:
The carbamate thixotropic agent acts as an intermediary between the inorganic fillers and the (meth)acrylate-based component. It forms a protective interaction network around the filler particles, preventing direct filler-filler contact that would lead to sedimentation. This intermediary mechanism allows the fillers to maintain their functional performance while being stably suspended in the composition during storage.
Solution Approach 2:
The patent modifies the rheological parameters of the composition by introducing the carbamate, which changes the flow behavior and interparticle forces. This parameter change creates a stable dispersion state where inorganic fillers remain suspended without sedimenting, while still providing the desired thermal conductivity or insulation properties in the cured product.
3Ease of operation
If low viscosity formulation is used to enable potting applications, then flowability is improved, but filler sedimentation and separation increase
Solution Approach 1:
The patent exploits dynamic rheological behavior through the carbamate thixotropic agent, which creates a time-dependent viscosity response. During application (when shear force is applied), the formulation exhibits low viscosity for easy flow and potting. During storage (when shear force is absent), the viscosity increases to prevent filler sedimentation. This dynamic viscosity adjustment resolves the contradiction between flowability and storage stability.
Solution Approach 2:
The carbamate induces parameter changes in the viscosity profile of the formulation, creating a non-Newtonian flow behavior. The formulation's viscosity parameter dynamically adjusts based on shear conditions: low during application for flowability, and high during storage for stability. This parameter transformation allows the same formulation to satisfy both contradictory requirements under different operational conditions.
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 solution provides a curable precursor with improved flowability, storage stability, and mechanical properties, ensuring that the cured product retains thermal conductivity or insulation performance without sedimentation, making it suitable for various industrial applications.
Implementation Method 1
a thixotropic agent which is a carbamate
Implementation Method 2
a radically (co)polymerizable (meth)acrylate-based component; a curing agent
Data Source
AI summary
The present disclosure relates to a curable precursor of a composition, the curable precursor comprising (a) a radically (co)polymerizable (meth)acrylate-based component; (b) a curing agent; (c) an inorganic filler having a mean particle size (d50) of at least 1 µm; and (d) a thixotropic agent which is a carbamate. The present disclosure further relates to the use of said curable precursor for thermal management applications in the automotive and electronic industry; as an electrically insulating composition in the electronic industry and for cable insulation; and as a color pigment comprising composition in the coating and paint industry.