Non-aqueous Vibration Damping Composition with Controlled K Value Binder
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Solution Overview
Problem
Current vibration damping systems for vehicles face challenges such as high water absorption, bubble formation during drying, and limited damping effectiveness at higher temperatures, particularly in non-aqueous LASD materials, which affect their stability and longevity.
Innovation Solution
A non-aqueous anti-drumming composition comprising a non-powdered polyacrylate binder with a K value of 10 to 35, inorganic fillers, and a radically polymerizable compound with a boiling point above 160 °C, which is solvent-free or low-solvent, enabling improved damping efficiency and reduced water absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If non-aqueous LASD materials are used, then drying speed and moisture stability are improved, but water absorption increases and bubble formation occurs during drying
Solution Approach 1:
The patent changes the chemical composition parameters by using polyacrylate powders with specific K values (10-35) and controlled glass transition temperatures, combined with plasticizers in optimized ratios, to achieve a balance between drying speed and water resistance. This parameter optimization resolves the contradiction by tuning the material properties to prevent excessive water absorption while maintaining fast drying.
Solution Approach 2:
The invention creates a composite system combining polyacrylate binder, inorganic fillers, and plasticizers in specific proportions. This composite approach allows the material to benefit from the fast drying of non-aqueous systems while the optimized composition prevents bubble formation and reduces water absorption, thus resolving the reliability issue.
2Stability of the object's composition
If polyacrylate powders with high glass transition temperature are used, then dimensional stability is improved, but damping effectiveness at higher temperatures is limited
Solution Approach 1:
The patent optimizes the glass transition temperature parameter of the polyacrylate binder to a specific range that balances dimensional stability with high-temperature damping performance. By selecting powders with controlled Tg values and adjusting plasticizer content, the material maintains stability at room temperature while remaining effective at elevated temperatures.
3Strength
If core-shell resins with high glass transition temperature are used, then structural stability is improved, but damping effectiveness decreases at higher temperatures
Solution Approach 1:
The invention modifies the core-shell resin parameters by adjusting the glass transition temperature to an optimal range and controlling the shell thickness and composition. This allows the material to maintain structural integrity while improving damping effectiveness at higher temperatures through the optimized thermal and mechanical properties.
4Ease of manufacture
If emulsion polymerization with spray drying is used, then polyacrylate powder production is achieved, but emulsifiers remain in the polymer and impair adhesion
Solution Approach 1:
The patent removes the harmful emulsifiers from the final polymer product through additional processing steps such as washing or extraction, while retaining the benefits of emulsion polymerization. This extraction of unwanted substances resolves the adhesion problem caused by emulsifier contamination.
Solution Approach 2:
The invention changes the chemical composition parameters by reducing emulsifier content to minimal levels through optimized production parameters, thereby maintaining ease of manufacture while improving adhesion properties by eliminating the harmful residual emulsifiers.
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 composition achieves enhanced vibration damping properties with low water absorption and prevents bubble formation, ensuring better stability and longevity of the applied material, even in humid environments.
Implementation Method 1
a radically polymerizable compound which has at least one radically polymerizable C-C double bond
Data Source
AI summary
The invention relates to a non-aqueous sound-deadening composition, comprising (a) a non-pulverulent polyacrylate binder having a K value in the range of 10 to 35, measured as a 1% solution in tetrahydrofuran; (b) inorganic fillers; and a free-radically polymerizable compound which comprises at least one free-radically polymerizable C-C double bond and has a boiling point at normal pressure of greater than 160°C. The invention also relates to a method for damping vibrations or oscillations in vehicle and machine components using the sound-deadening composition according to the invention.