Polyimide Rubber Laminate Adhesion via Polyamide Elastomer
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Solution Overview
Problem
There is a lack of techniques for joining a layer of polyimide resin and a layer of rubber composition without using an adhesive, and existing resin compositions with high polyamide-polyether elastomer content do not exhibit adequate adhesiveness with various rubber components.
Innovation Solution
A laminate comprising a polyimide resin layer and an unvulcanized rubber composition, where the rubber composition includes a rubber component, a specific amount of polyamide-polyether elastomer, a condensate of a phenolic compound with formaldehyde, a methylene donor, and a vulcanizing agent, which exhibits excellent adhesion properties to the polyimide resin when heated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyimide resin layer is bonded to a rubber member, then the composite material achieves excellent properties such as toughness, heat resistance, and chemical stability, but a technique for joining these materials without adhesive has not been proposed
Solution Approach 1:
The patent merges the adhesive function into the rubber composition itself by incorporating a polyamide-polyether elastomer (20-100 parts by weight per 100 parts of rubber component), phenolic compound condensate, and methylene donor. This combination enables the rubber composition to adhere directly to the polyimide resin layer without requiring a separate adhesive layer, thus simplifying the overall structure while achieving strong bonding.
Solution Approach 2:
The patent creates a composite rubber composition system combining multiple components (rubber component, polyamide-polyether elastomer, phenolic compound condensate, methylene donor, and vulcanizing agent) that work synergistically. The polyamide-polyether elastomer provides adhesion to polyimide, while the phenolic compound condensate and methylene donor enhance crosslinking and bonding, resulting in a composite material that achieves both strong adhesion and simplified processing.
2Strength
If a resin composition comprises a high proportion of polyamide-polyether elastomer (80 to 100% by weight), then the polyimide resin adheres to the resin composition, but the composition does not exhibit adhesiveness depending on the type of rubber component
Solution Approach 1:
The patent optimizes the proportion of polyamide-polyether elastomer to 20-100 parts by weight per 100 parts of rubber component (rather than 80-100% as in prior art), and introduces specific amounts of phenolic compound condensate (0.5-10 parts) and methylene donor (0.25-50 parts). These parameter adjustments enable the composition to achieve adequate adhesiveness across different rubber component types while maintaining processability.
Solution Approach 2:
The patent introduces phenolic compound condensate and methylene donor as intermediary substances that facilitate bonding between the polyamide-polyether elastomer and various rubber components. These intermediaries enhance the compatibility and adhesion between different material types, making the composition versatile across different rubber component selections.
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 high adhesion strength between the polyimide resin and rubber layers without adhesives, simplifying the production process and enabling the creation of composite materials with excellent properties like toughness, heat resistance, and chemical stability for pneumatic tires.
Implementation Method 1
a rubber composition comprising a rubber component, a polyamide-polyether elastomer in a specific amount with respect to the rubber component, a condensate of a specific phenolic compound with formaldehyde, and a methylene donor exhibits excellent adhesion properties to a polyimide resin
Implementation Method 2
vulcanizing the green tire
Data Source
AI summary
Provided is a laminate which comprises a layer of a polyimide resin and a layer of an unvulcanized rubber composition, and wherein the rubber composition contains (A) a rubber component, (B) 20-100 parts by mass of a polyamide polyether elastomer per 100 parts by mass of the rubber component (A), (C) a condensation product of formaldehyde and a compound represented by formula (1) (wherein each of R1, R2, R3, R4 and R5 is independently selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkyl group having 1-8 carbon atoms, a hydroxyalkyl group having 1-8 carbon atoms and an alkoxide group having 1-8 carbon atoms), (D) a methylene donor and (E) a vulcanizing agent. A laminate according to the present invention exhibits improved bonding strength between a layer of a polyimide resin and a layer of a rubber composition.