Adhesive Resin Laminate With Temperature-Differentiated Layers
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Solution Overview
Problem
Existing adhesive resin compositions struggle to achieve good adhesiveness to two different adherends when used as an intermediate layer, as it is challenging to match the conditions for optimal adhesion between the adherends.
Innovation Solution
An adhesive resin laminate with a first adhesive layer containing a modified polyolefin resin and an epoxy-based crosslinking agent, and a second adhesive layer made of polyolefin-based resin, where the adhesion initiation temperature of the second layer is set 30°C higher than that of the first layer, ensuring excellent adhesive force between the two adherends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single adhesive resin composition is used to adhere two different adherends, then the adhesion to one adherend can be improved, but the adhesion to the other adherend deteriorates
Solution Approach 1:
The adhesive resin layer is divided into two distinct layers: a first adhesive layer containing a modified polyolefin resin and crosslinking agent for adhering to the first adherend, and a second adhesive layer containing a polyolefin-based resin for adhering to the second adherend. Each layer is optimized for its specific adherend, enabling excellent adhesion to both different materials simultaneously.
Solution Approach 2:
Different regions of the adhesive resin layer have different compositions and properties. The first adhesive layer has properties optimized for bonding to the first adherend (with crosslinking agent for strong adhesion), while the second adhesive layer has properties optimized for bonding to the second adherend. This local differentiation allows each layer to perform its specific function effectively.
2Stability of the object's composition
If the adhesion initiation temperatures of two adhesive layers are similar, then both layers can adhere simultaneously, but interlayer peeling occurs; if temperatures are different, sequential adherence is achieved but process complexity increases
Solution Approach 1:
The adhesion initiation temperature is used as a key parameter to differentiate the two adhesive layers. The first adhesive layer is designed to initiate adhesion at a lower temperature, while the second adhesive layer initiates at a higher temperature. This parameter differentiation enables sequential adhesion without requiring complex process control, as the temperature progression naturally controls the adhesion sequence.
Solution Approach 2:
The first adhesive layer is designed to activate first at a lower temperature, establishing the initial bond between the adhesive resin and the first adherend. This preliminary adhesion provides a stable base before the second adhesive layer activates at a higher temperature, preventing interlayer peeling during the adhesion process.
3Strength
If a crosslinking agent is added to improve adhesive strength, then adhesion to metal adherends improves, but adhesion to resin adherends deteriorates due to excessive rigidity
Solution Approach 1:
The crosslinking agent is segregated to only the first adhesive layer, which contacts the metal adherend. The second adhesive layer, which contacts the resin adherend, contains only polyolefin-based resin without crosslinking agent. This segmentation allows the first layer to achieve strong adhesion to metal through crosslinking, while the second layer maintains flexibility and compatibility with resin adherends.
Solution Approach 2:
The first adhesive layer has a crosslinked structure providing high strength and rigidity for metal adhesion, while the second adhesive layer has a non-crosslinked, more flexible structure suitable for resin adhesion. This local quality differentiation allows each layer to have the appropriate mechanical properties for its specific adherend type.
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 laminate achieves superior adhesion to both adherends, allowing for effective lamination and improved durability, while the temperature difference in adhesion initiation facilitates sequential adherence without interlayer peeling.
Implementation Method 1
the first adhesive layer includes a base resin and a crosslinking agent, the base resin is a modified polyolefin resin, the crosslinking agent is an epoxy-based compound
Implementation Method 2
when an adhesion initiation temperature of the first adhesive layer is set to T1 and an adhesion initiation temperature of the second adhesive layer is set to T2, T2 is higher than T1 by 30° C. or more
Data Source
AI summary
Provided are an adhesive resin laminate having an excellent adhesive force to two adherends, a laminate in which this adhesive resin laminate is laminated with two adherends, and a method of producing them. An adhesive resin laminate having at least a first adhesive layer and a second adhesive layer, in which the first adhesive layer includes a base resin and a crosslinking agent, the base resin is a modified polyolefin resin, the crosslinking agent is an epoxy-based compound, the second adhesive layer includes a polyolefin-based resin, and when an adhesion initiation temperature of the first adhesive layer is set to T1, and an adhesion initiation temperature of the second adhesive layer is set to T2, T2 is higher than T1 by 30° C. or more.