Norbornene Silane Coated Reinforcing Material Viscosity Rigidity
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Solution Overview
Problem
The existing reaction injection molding method using norbornene polymers with inorganic fillers faces challenges of high viscosity fluid compositions and poor filler dispersion, leading to low rigidity in the resulting articles, despite attempts to improve adhesiveness with silane coupling agents.
Innovation Solution
A surface-coated reinforcing material with laminated coating layers, comprising a silane coupling agent with a norbornene structure and another coupling agent or fatty acid, is used to enhance the adhesiveness and dispersion of inorganic fillers within the fluid composition, maintaining low viscosity and improving the rigidity of the molded articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a silane coupling agent with norbornene structure is used to improve adhesiveness between inorganic filler and polymer, then the adhesiveness is improved, but the viscosity of the fluid composition increases significantly
Solution Approach 1:
The patent changes the chemical structure parameters of the coupling agent by introducing a norbornene group with specific steric hindrance characteristics. This structural modification allows the coupling agent to provide strong adhesion while maintaining lower viscosity due to the unique spatial configuration that reduces molecular entanglement in the fluid composition.
Solution Approach 2:
The invention creates a composite coupling effect by combining the silane coupling agent with norbornene group and inorganic filler surface. This composite structure achieves both strong interfacial adhesion and maintained fluidity, as the norbornene group participates in polymerization while the silane portion bonds to the filler surface.
2Strength
If a large amount of inorganic filler is added to improve rigidity, then the rigidity should be improved, but the dispersion of the inorganic filler becomes poor and viscosity increases
Solution Approach 1:
The silane coupling agent acts as an intermediary substance between the inorganic filler particles and the norbornene polymer matrix. It mediates the interaction by providing both filler surface bonding and polymer participation capabilities, enabling good dispersion even at high filler concentrations.
Solution Approach 2:
The patent modifies the surface parameters of the inorganic filler by coating it with the silane coupling agent. This surface parameter change prevents filler particle aggregation and improves dispersion stability in the fluid composition, allowing high rigidity without sacrificing compositional uniformity.
3Strength
If the fluid composition contains high viscosity to ensure good adhesion, then the adhesion is improved, but the handling properties and injection molding become difficult
Solution Approach 1:
The invention optimizes the viscosity parameter of the fluid composition by selecting a coupling agent with specific molecular structure (norbornene group). This structural parameter change enables the system to achieve strong adhesion while maintaining acceptable viscosity for handling and injection molding operations.
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 surface-coated reinforcing material effectively improves the rigidity and bending strength of reaction injection molded articles without increasing the viscosity of the fluid composition, ensuring good handling properties and dimensional stability.
Implementation Method 1
a silane coupling agent (I) having at least one hydrocarbon group having a norbornene structure
Implementation Method 2
can be well dispersed therein
Data Source
AI summary
Provided is a surface-coated reinforcing material which, when used in a fluid composition for reaction injection molding, causes substantially no increase in the viscosity of said fluid composition and can be well dispersed therein, and can improve the rigidity of an article obtained by reaction injection molding the same. The surface-coated reinforcing material is provided, on the surface of a reinforcing material, with laminated coating layers consisting of one or more coating layers (A), which comprise a silane coupling agent (I) having at least one hydrocarbon group having a norbornene structure, and one or more coating layers (B), which comprise a coupling agent other than the silane coupling agent (I) and/or a fatty acid.