Multilayer Emulsion Resin for Vibration Damping Coatings
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Solution Overview
Problem
Conventional vibration damping coatings fail to provide a coat with excellent appearance and effective vibration damping properties across a wide temperature range, particularly in environments like vehicle interiors where temperatures vary from 10° C. to 60° C., due to sagging issues during heat-drying.
Innovation Solution
A vibration damping coating resin composition with an emulsion particle having a multilayer structure, where the outermost layer has a glass transition temperature of 60° C. or higher, present in a proportion of 1% to 30% by mass, and an inner layer with a glass transition temperature close to the use environment, combined with components like sulfosuccinic acid salts or fatty acid salts to prevent sagging and blisters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin with glass transition temperature close to use environment temperature is used to achieve good vibration damping property, then vibration damping performance is improved, but the coat sags during heat-drying due to high temperature exceeding the glass transition temperature
Solution Approach 1:
The invention divides the coating resin into two distinct segments: a core resin with glass transition temperature close to the use environment (−30°C to 40°C) for vibration damping, and a shell resin with higher glass transition temperature (60°C or higher) to prevent sagging during heat-drying. This segmentation allows each component to perform its specific function without interfering with the other.
Solution Approach 2:
The invention creates a composite resin system by combining core resin and shell resin in specific proportions (core resin 70-98 mass%, shell resin 2-30 mass%). The composite structure integrates the vibration damping properties of the core resin with the heat resistance of the shell resin, achieving both performance requirements simultaneously.
2Shape
If the glass transition temperature of the coating resin is increased to prevent sagging during heat-drying, then appearance quality is improved, but vibration damping performance deteriorates because the glass transition temperature moves away from the use environment temperature range
Solution Approach 1:
The coating resin is segmented into functional zones: the core resin (70-98 mass%) maintains glass transition temperature close to use environment for vibration damping, while the shell resin (2-30 mass%) provides high glass transition temperature (60°C or higher) for sag prevention. This segmentation resolves the contradiction by assigning different temperature characteristics to different parts of the resin structure.
Solution Approach 2:
The composite resin system combines materials with different glass transition temperatures in optimized ratios. The dominant core resin ensures vibration damping performance, while the minority shell resin component provides sufficient heat resistance for appearance quality, achieving both goals through compositional design.
3Shape
If a thin outermost layer is used in the emulsion particle to prevent sagging and blisters, then appearance quality is improved, but the mass proportion of the outermost layer must be precisely controlled within 1% to 30%
Solution Approach 1:
The invention optimizes the mass proportion parameter of the shell resin within the emulsion particle to be between 1% and 30%, with the shell layer thickness carefully controlled to be thin. This parameter optimization ensures sufficient appearance quality improvement while maintaining practical manufacturability and avoiding excessive structural complexity.
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 effectively prevents sagging and blisters, maintaining a good appearance while providing excellent vibration damping performance across the desired temperature range, ensuring both appearance and functionality are met simultaneously.
Implementation Method 1
the outermost layer including a resin having a glass transition temperature of 60° C. or higher which is not much lower than the temperature of heat-drying of the coating
Implementation Method 2
an emulsion particle having a thin outermost layer which is present in a proportion of 1% to 30% by mass in 100% by mass of the emulsion particle prevents sagging due to heat during heat-drying and blistering and cracking of the coat
Implementation Method 3
vibration damping coatings have been proposed which can absorb vibration and sound in the form of a coat on the surface of structures of various shapes
Data Source
AI summary
The invention provides a method for providing a coat having excellent appearance and an excellent vibration damping property in a temperature range of a use environment of vibration damping materials. The invention relates to a vibration damping coating resin composition including an emulsion particle having a multilayer structure, the emulsion particle including an outermost layer and an inner layer located inside the outermost layer, the outermost layer being formed from a resin having a glass transition temperature of 60° C. or higher, the outermost layer being present in a proportion of 1% to 30% by mass in 100% by mass of the emulsion particle.