Polythiol Adhesive Composition for Vulcanized Rubber Bonding
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Solution Overview
Problem
Existing methods for bonding vulcanized rubber members are labor-intensive, time-consuming, and result in insufficient adhesion due to the use of polyurethane adhesives, which require surface treatment and have long curing times.
Innovation Solution
A composition blending a polythiol compound, an isocyanate group-containing compound, and a radical generator, specifically formulated to enhance adhesion strength and reduce curing time, allowing for strong and rapid bonding of rubber members, including vulcanized rubber, using a combination of urethanation and thiol-ene reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface treatment and polyurethane adhesive are used to bond vulcanized rubber, then adhesion is achieved, but labor time and curing time increase significantly
Solution Approach 1:
The patent changes the chemical parameters of the adhesive system by using a thiol group-containing compound instead of conventional polyurethane adhesive. This chemical parameter change enables rapid curing through thiol-ene reaction, reducing curing time from hours to minutes while maintaining strong adhesion to vulcanized rubber surfaces.
Solution Approach 2:
The invention creates a composite adhesive system combining thiol group-containing compound, isocyanate group-containing compound, and radical generator. This composite material approach enables dual-functionality: the thiol group provides rapid bonding through thiol-ene reaction, while the isocyanate group enhances adhesion to rubber surfaces, achieving both speed and strength.
2Reliability
If surface treatment is performed on vulcanized rubber, then adhesion is improved, but labor and process complexity increase
Solution Approach 1:
The patent extracts and eliminates the surface treatment step from the bonding process. By formulating an adhesive that can directly bond to the as-received vulcanized rubber surface, the invention removes the complex surface preparation operations while maintaining effective adhesion through the thiol-isocyanate-radical generator system.
Solution Approach 2:
The adhesive composition performs self-preparation by chemically activating the bonding interface through the radical generator and thiol-isocyanate reaction system. The adhesive itself provides the necessary chemical functionality to bond to rubber without requiring external surface treatment processes, making the system self-sufficient.
3Reliability
If polyurethane adhesive is used for bonding rubber, then adhesion is achieved, but the adhesion force remains insufficient
Solution Approach 1:
The invention employs a composite adhesive system where thiol group-containing compound, isocyanate group-containing compound, and radical generator work synergistically. The thiol-ene reaction provides rapid crosslinking and strong bonding, while the isocyanate groups form additional bonds with rubber functional groups, creating a multi-mechanism adhesion system that exceeds conventional polyurethane adhesive performance.
Solution Approach 2:
The patent fundamentally changes the chemical reaction parameters by introducing thiol-ene reaction mechanism with radical initiator. This parameter change transforms the adhesive chemistry from slow polyurethane curing to rapid thiol-ene crosslinking, achieving both higher bond strength and faster curing while maintaining compatibility with rubber substrates.
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, rapid adhesion to both unvulcanized and vulcanized rubber, significantly reducing bonding time and improving adhesion force, while maintaining a high content of essential components for effective bonding.
Implementation Method 1
a composition obtained by blending a polythiol compound (A), an isocyanate group-containing compound (B) and a radical generator (C)
Implementation Method 2
a composition obtained by blending a polythiol compound (A), an isocyanate group-containing compound (B) and a radical generator (C)
Data Source
AI summary
The present invention provides a composition obtained by blending a polythiol compound (A), an isocyanate group-containing compound (B) and a radical generator (C), wherein the polythiol compound (A) is at least one compound selected from an aliphatic polythiol and an aromatic polythiol each of which has a thiol group binding to a primary carbon atom and may contain a hetero atom. The present invention thus provides a composition capable of bonding a rubber member, particularly a vulcanized rubber member, strongly, readily and within a short time, an adhesive and an adhesive sheet using the composition, and a laminate produced by bonding a rubber layer using at least one of these adhesive composition and adhesive sheet.