Polyester Cord Adhesive Treatment for Tire Durability
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Solution Overview
Problem
The existing adhesive properties between polyester fibers and rubber in tires are insufficient, particularly under high-speed and high-load conditions, leading to premature failure of tire components like the carcass ply and run-flat tires due to inadequate heat-resistant adhesive strength.
Innovation Solution
A tire design that incorporates a polyester cord formed by twisting polyester filaments and treating them with a specific adhesive agent composition, including a thermoplastic high molecular weight polymer, water-soluble polymers, and surface treatments like epoxy groups, to enhance the dynamic adhesive property and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive agents (RFL-based or basic epoxy-based) are used to treat polyester fibers, then the adhesive property between PET and rubber can be improved to some extent, but the heat resistant adhesive property under high-speed and high-load conditions remains insufficient
Solution Approach 1:
The patent modifies the chemical parameters of the adhesive agent by incorporating specific epoxy compounds with particular molecular structures and ratios. The adhesive composition includes epoxy compounds containing aromatic rings and ether bonds, with controlled molecular weights and functional group ratios, to achieve both strong adhesion and heat resistance under dynamic strain conditions
Solution Approach 2:
The patent creates a composite adhesive system combining multiple components: epoxy compounds, polyhydric alcohols, carboxylic acid anhydrides, and optional additives. This composite formulation synergistically improves both the adhesive strength and heat resistant properties, preventing separation failure under high-speed and high-load conditions
2Ease of manufacture
If polyester fiber is used as reinforcing cord in tire carcass ply, then the tire can be manufactured with good basic properties, but separation failure occurs at the tire side portion under high-speed and high-load conditions
Solution Approach 1:
The patent applies surface treatment to the polyester fiber before cord formation and adhesive application. The fiber surface is pre-treated with plasma, corona discharge, or chemical treatments to increase surface energy and create anchoring sites, ensuring that when the improved adhesive agent is applied, it achieves maximum bonding strength that prevents separation under dynamic strain conditions
3Stability of the object's composition
If polyester fiber is used in run-flat tire carcass ply, then the tire structure is established, but separation failure occurs during run-flat traveling due to insufficient adhesive strength
Solution Approach 1:
The patent adjusts the adhesive composition parameters specifically for run-flat tire applications, including the ratio of epoxy compounds to polyhydric alcohols, the molecular weight distribution, and the addition of heat-resistant additives. These parameter changes ensure the adhesive maintains its bonding strength during the extended period of run-flat traveling under high temperature and stress conditions
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 enhanced adhesive properties significantly improve the durability and performance of tires under high-speed and high-load conditions, preventing premature failure and extending the lifespan of tire components.
Implementation Method 1
a surface treatment agent having an epoxy group is attached to the surface of the fiber
Implementation Method 2
the polyester cord is formed by twisting polyester filaments, and then subjecting the twisted filaments to an adhesive agent treatment
Data Source
AI summary
Provided is a tire whose durability is improved by using, as a reinforcing member, a polyester cord having an improved heat resistant adhesive property to rubber. Provided is a tire in which a rubber-cord complex composed of a polyester cord and a rubber is used as a reinforcing member. The polyester cord is formed by twisting polyester filaments, and then subjecting the twisted filaments to an adhesive agent treatment. The polyester filament is made of a polyester fiber which is composed of a polyester having ethylene terephthalate as a main repeating unit and having an intrinsic viscosity of 0.85 or higher, wherein the amount of terminal carboxy group in the fiber is 20 equivalent/ton or larger, the long period according to small-angle X-ray diffraction is 9 to 12 nm, and a surface treatment agent having an epoxy group is attached to the surface of the fiber.