Core-Shell Acrylic Emulsion for Vibration Damping
Solution Overview
Problem
Conventional vibration damping materials face challenges in achieving excellent thermal drying properties and mechanical stability, particularly when forming coating films on vertical or inclined surfaces, and they often suffer from sagging or collapse during high-temperature drying, requiring improvements in workability and storage stability at low temperatures.
Innovation Solution
An emulsion for vibration damping materials is developed using acrylic emulsion particles with a core-shell structure, where the monomer component includes specific Q and e values to suppress mixing of core and shell parts, enhancing vibration damping properties and mechanical stability across a wide temperature range while maintaining low-temperature storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional emulsion for vibration damping materials is coated on vertical or inclined surface and dried by heating, then the coating material can be dried to form a coating film, but the coating film sags or collapses during or after heating
Solution Approach 1:
The patent changes the chemical composition parameters of the emulsion by incorporating specific polymers (polyvinyl alcohol, carboxymethyl cellulose, or starch) and controlling the molecular weight and composition ratios. This modifies the rheological properties and drying characteristics of the coating material, enabling it to maintain film integrity during high-temperature drying while preventing sagging on vertical surfaces.
Solution Approach 2:
The patent creates a composite emulsion system combining multiple components: vibration damping particles, polymer emulsions, and specific thickening agents. This composite formulation synergistically provides both the vibration damping function and the structural integrity needed to prevent coating film collapse during thermal drying processes.
2Duration of action of stationary object
If conventional emulsion for vibration damping materials is stored in cold regions, then the emulsion can be stored for later use, but the emulsion may freeze or lose its usable state at low temperatures
Solution Approach 1:
The patent adjusts the chemical composition by selecting polymers with appropriate glass transition temperatures and adding anti-freezing agents. This modifies the freezing point and low-temperature flow characteristics of the emulsion, ensuring it remains usable in cold storage conditions without freezing or separating.
Solution Approach 2:
The patent introduces specific polymer additives and thickening agents that act as intermediaries between the emulsion components and the cold environment. These additives modify the emulsion's thermal properties and provide low-temperature stability, protecting the emulsion from freezing while maintaining its coating properties.
3Manufacturing precision
If thickener for aqueous vibration damping materials is used to improve drying property, then cracks or blisters on surface are prevented, but vibration damping performance and mechanical stability are insufficient
Solution Approach 1:
The patent develops a composite formulation that combines vibration damping particles with specific polymer emulsions and controlled amounts of thickener. This composite structure ensures that the thickener provides sufficient surface quality (preventing cracks and blisters) while the vibration damping particles maintain the required vibration damping performance and mechanical stability.
Solution Approach 2:
The patent applies different functional components to different aspects of the coating: vibration damping particles provide the damping performance, while controlled amounts of thickener and polymer emulsions provide surface quality and mechanical integrity. This localized functional distribution optimizes both surface quality and vibration damping performance simultaneously.
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 emulsion effectively forms a coating film that does not sag on vertical surfaces, exhibits high vibration damping performance, and maintains stability during thermal drying, offering improved mechanical and storage stability, thus addressing the limitations of existing technologies.
Implementation Method 1
the monomer component includes specific Q and e values to suppress mixing of core and shell parts
Implementation Method 2
the coating film does not collapse, for example, it does not sag, even when it is dried by heating
Implementation Method 3
the coating material is dried by heating at a high temperature, for example, by baking
Data Source
AI summary
The present invention has an object to provide at least one of the following (1) to (3). (1) To provide the following emulsion for vibration damping materials: it is excellent in vibration damping property, drying property, and mechanical stability; it can improve skinning property of the coating film surface; and it can form an excellent coating film which hardly collapses, for example, hardly sags, even if the emulsion is coated on the vertical surface and dried by heating at a high temperature. (2) To provide the following emulsion for vibration damping materials: it is excellent in vibration damping property and thermal drying property; it is hardly changed with time; it can improve the stability or dispersibility of the composition; and it can form a coating film exhibiting excellent vibration damping property even if the emulsion is coated on an inclined object. (3) To provide the following emulsion for vibration damping materials: it includes acrylic emulsion particles each having a core part and a shell part and exhibits high vibration damping property in a wide temperature region; it is excellent in mechanical stability; and it is also excellent in storage stability at a low temperature. The present invention relates to an emulsion for vibration damping materials, including an emulsion obtainable by emul sion polymerization of a monomer component, wherein the emulsion is obtainable by emulsions polymerization using an anionic emulsifier and/or a reactive emulsifier, and emulsions particles have an average particle diameter of 100 to 450 nm, and an emulsion for vibration damping materials, comprising acrylic emulsion particles each having a core part and a shell part, wherein the acrylic emulsion particles are obtainable by polymerizing a monomer component including a monomer having a Q value of 0.6 to 1.4 and an e value of -0.4 to -1.2.