Phase-Separating Aqueous Resin Adhesive for Rubber–Resin Bonding
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Solution Overview
Problem
Existing aqueous resin compositions fail to exhibit sufficient adhesive force when bonding dissimilar materials, such as rubber and resin base materials.
Innovation Solution
A composite resin composition containing a vinyl polymer and a urethane resin, with specific functional groups capable of reacting with a -SH group, is used, allowing for improved adhesion by phase separation and segregation based on the type of base material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a composite resin is used to bond dissimilar materials, then adhesive force should be improved, but existing composite resins fail to provide sufficient adhesive force
Solution Approach 1:
The patent applies local quality by creating phase-separated regions within the composite resin where different resin components concentrate at specific locations. The vinyl polymer and urethane resin separate into distinct phases during thermocompression bonding, with each phase providing localized adhesion to different base materials (rubber or resin), thereby achieving superior bonding effectiveness to dissimilar materials.
Solution Approach 2:
The patent uses composite materials by combining vinyl polymer and urethane resin in a composite resin system. This composite structure allows the material to exhibit properties of both constituent resins, enabling simultaneous adhesion to rubber and resin base materials through phase separation and selective segregation to different substrates.
2Ease of operation
If the composite resin remains homogeneous during application, then application uniformity is maintained, but adhesive force on dissimilar materials is insufficient
Solution Approach 1:
The patent applies preliminary action by maintaining the composite resin in a homogeneous state during application and storage, ensuring uniform coating and handling. The phase separation is triggered later during thermocompression bonding when heat and pressure cause the vinyl polymer and urethane resin to segregate into distinct phases, providing the necessary adhesive functionality at the bonding stage.
Solution Approach 2:
The patent implements dynamics by transitioning the composite resin from a static homogeneous state during application to a dynamic phase-separated state during bonding. The resin system adapts its internal structure in response to processing conditions, remaining uniform at low temperatures for ease of application but separating into functional phases under thermocompression bonding conditions to maximize adhesive force.
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 strong adhesive force between dissimilar materials, enhancing bonding effectiveness.
Implementation Method 1
phase separation occurs between a plurality of resins contained in the composite resin during thermocompression bonding, and segregation occurs depending on the type of the base material
Implementation Method 2
The composite resin (A) has a group capable of reacting with a -SH group
Data Source
AI summary
Provided is an aqueous resin composition containing a composite resin (A) and an aqueous medium (B). The composite resin (A) contains a vinyl polymer and a urethane resin (A2). The vinyl polymer contains a unit derived from a conjugated diene compound. The composite resin (A) has a group capable of reacting with a -SH group. The aqueous resin composition is preferably used as an adhesive because the aqueous resin composition can exhibit a strong adhesive force even during adhering of dissimilar base materials, for example, a rubber base material and a resin base material.