Adhesive Formulation for Reinforcing Inserts Resolving Dispersion Stability
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Solution Overview
Problem
Existing one-step adhesive systems for reinforcing inserts, such as tyre cord, suffer from non-homogeneity due to sedimentation or flocculation, leading to reduced adhesion and inadequate pot life, which is insufficient for efficient production of reinforced polymer products.
Innovation Solution
A one-step adhesive formulation incorporating bisphenol A epoxy novolak, resorcinol formaldehyde latex, and isocyanate in a specific solid content ratio, preventing sedimentation and flocculation, and extending pot life to at least 6 hours with improved adhesion and uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a one-step adhesive system containing RFL, epoxide, and isocyanate is used, then the processing complexity is reduced and productivity is improved, but the dispersion becomes non-homogeneous due to sedimentation or flocculation, leading to reduced adhesion and inadequate pot life
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive system by introducing a specific polyol component with defined molecular weight and hydroxyl number ranges. This parameter change stabilizes the dispersion system, preventing sedimentation and flocculation while maintaining homogeneity throughout the pot life period, thus resolving the contradiction between processing efficiency and dispersion stability
Solution Approach 2:
The invention creates a composite adhesive formulation combining RFL, epoxide, isocyanate, and a specifically selected polyol. This composite system leverages the synergistic effects of multiple components where the polyol acts as a stabilizing agent that maintains dispersion homogeneity while allowing the other components to provide their respective adhesive functions, enabling both high productivity and composition stability
2Duration of action of moving object
If the pot life of the adhesive formulation is extended to at least 6 hours, then the productivity and ease of operation are improved, but the dispersion stability must be maintained without sedimentation or flocculation
Solution Approach 1:
The patent carefully adjusts the molecular weight and hydroxyl number parameters of the polyol component to optimize the pot life. By selecting polyols within specific parameter ranges, the formulation achieves extended pot life of at least 6 hours while maintaining consistent adhesion quality, as the modified parameters control the reaction kinetics and dispersion stability over the extended time period
Solution Approach 2:
The invention uses a polyol with specifically controlled excess hydroxyl groups that partially react during the pot life period, creating a stable but not fully cured system. This partial action approach allows the adhesive to remain workable and homogeneous for at least 6 hours while ensuring that sufficient reactive groups remain available to achieve good adhesion when applied to the reinforcing insert
3Device complexity
If a one-step system is used to simplify the process, then the device complexity is reduced, but coating formation on conveyor rollers and blockage of vacuum suction lips occur
Solution Approach 1:
The patent modifies the viscosity and composition parameters of the adhesive formulation by selecting polyols with specific molecular weights and hydroxyl numbers. These parameter changes adjust the flow and coating characteristics of the dispersion, preventing excessive coating formation on conveyor rollers and blockage of vacuum suction lips while maintaining the simplified one-step process structure
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 formulation achieves extended pot life, maintaining good adhesion and preventing coating formation on conveyor rollers, ensuring a uniform and flexible reinforcing insert with reduced adhesive loss, suitable for non-activated polyester and PET cords.
Implementation Method 1
preventing sedimentation and flocculation
Implementation Method 2
preventing sedimentation and flocculation
Implementation Method 3
improve the adhesion between textile reinforcing insert and the rubber
Data Source
AI summary
The present invention relates to an adhesive formulation in the form of an aqueous dispersion with a solids content of 10 to 40% by weight relative to the adhesive formulation, for the treatment of reinforcing inserts for the production of reinforced polymer products, 100% by weight of the solids containinga) 1 to 20% by weight of a bisphenol A epoxy novolak,b) 0 to 20% by weight of an entirely or partially blocked isocyanate,c) 60 to 92% by weight of a resorcinol formaldehyde latex (RFL).