Acid-Modified Polypropylene Adhesive Layer for Tire Metal Cord Bonding
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Solution Overview
Problem
The existing methods for improving adhesion between metal cords and resin layers in tires, such as using high elastic modulus resins, lead to reduced ride quality and durability issues due to hardening and unfilled spaces between cords, which can result in rusting and decreased durability.
Innovation Solution
A tire design featuring a metal-resin composite with a structure of a metal member, an acid-modified polypropylene adhesive layer, and a resin layer without vulcanized rubber, where the adhesive layer has a crystallinity of 21% to 40%, ensuring improved adhesion and ride quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a resin with high elastic modulus is used in the adhesive layer to improve adhesion strength, then the adhesion between metal cord and resin layer is improved, but the ride quality deteriorates due to hardening of the adhesive layer
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crystallinity of the adhesive layer within 21% to 40%. This specific crystallinity range optimizes the balance between adhesion strength and ride quality - the crystalline structure provides sufficient bonding strength while the controlled degree of crystallinity prevents excessive hardening, thereby maintaining comfortable ride characteristics.
Solution Approach 2:
The patent uses composite materials by combining acid-modified polypropylene with specific crystallinity characteristics in the adhesive layer. This composite approach allows the adhesive layer to exhibit both strong adhesion properties and flexible mechanical characteristics that preserve ride quality, resolving the contradiction between strength and comfort.
2Strength
If a resin with high elastic modulus is used in the adhesive layer to improve adhesion, then the adhesion strength is improved, but the durability deteriorates due to unfilled spaces between metal cords allowing water entry and rusting
Solution Approach 1:
The patent applies parameter changes by controlling the crystallinity of the adhesive layer to 21% to 40%. This specific crystallinity range enables the adhesive material to effectively flow into and fill the spaces between multifilament metal cords during application, ensuring complete coverage and preventing water penetration that would cause rusting, while still maintaining strong adhesion.
3Strength
If conventional adhesive methods are used, then the adhesion between metal cord and resin layer is achieved, but the adhesion durability is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the crystallinity of the adhesive layer to 21% to 40%. This specific crystallinity range provides the right balance of flexibility and bonding strength, allowing the adhesive to maintain strong adhesion to both the metal cord and resin layer while resisting degradation over time, thereby achieving superior adhesion durability.
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 proposed solution achieves excellent adhesion and ride quality by using an acid-modified polypropylene adhesive layer with specific crystallinity, enhancing the durability and resistance to rusting while maintaining a favorable tire performance.
Implementation Method 1
a metal-resin composite having a structure in which a metal member, an adhesive layer and a resin layer are disposed in this order... the adhesive layer comprises an acid-modified polypropylene
Implementation Method 2
when a metal cord is a multifilament type formed from multiple metal cords, there is a problem in that it is difficult for an adhesive to fill a space between the metal cords
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A tire comprising a tire frame that comprises a resin material and has a circular shape, and a metal-resin composite, the metal-resin composite having a structure in which a metal member, an adhesive layer and a resin layer are disposed in this order, and the adhesive layer comprising an acid-modified polypropylene and having a crystallinity of from 21% to 40%.