Epoxide-Free Dipping Bath for Reinforcing Inserts
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Solution Overview
Problem
Existing dipping bath compositions for producing reinforced rubber products face issues with adhesion due to the use of epoxides, which cause foaming, reduce storability, and require high shearing forces, leading to incomplete dissolving and defects in the coating process, making it difficult to achieve good peel adhesion and surface covering without epoxides.
Innovation Solution
An aqueous dipping bath composition comprising a blocked methylene diphenyl isocyanate mixture, resorcinol-formaldehyde latex, and optional additives, essentially free of epoxides, is used to treat reinforcing inserts, providing improved adhesion properties without the drawbacks of epoxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If epoxides are added to dipping bath compositions to achieve good adhesion properties, then peel adhesion and surface covering are improved, but foaming occurs requiring defoamers, storability is reduced, and high shearing forces are required leading to incomplete dissolving and coating defects
Solution Approach 1:
The patent removes epoxides from the dipping bath composition entirely, replacing them with an aqueous system containing resorcinol-formaldehyde latex and isocyanate. This extraction eliminates the harmful foaming effect while maintaining adhesion functionality through the alternative chemical system.
Solution Approach 2:
The patent fundamentally changes the chemical parameters of the dipping bath by transitioning from an epoxide-based system to an aqueous system with resorcinol-formaldehyde latex and isocyanate. This parameter change eliminates foaming while achieving comparable or superior adhesion properties through different chemical mechanisms.
2Strength
If epoxides are added to dipping bath compositions to achieve good adhesion properties, then peel adhesion and surface covering are improved, but storability is reduced
Solution Approach 1:
The patent removes epoxides from the composition, which are responsible for reduced storability. The alternative aqueous system with resorcinol-formaldehyde latex and isocyanate provides stable long-term storage without the degradation issues associated with epoxides.
3Strength
If epoxides are used in dipping bath compositions, then adhesion properties are achieved, but high shearing forces are required causing incomplete dissolving and coating defects
Solution Approach 1:
The patent changes the physical and chemical parameters of the dipping bath system to an aqueous formulation with resorcinol-formaldehyde latex and isocyanate. This new system requires no high shearing forces for dissolution, eliminates coating defects, and maintains excellent adhesion properties through the latex-isocyanate reaction mechanism.
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 solution achieves very good peel adhesion and surface covering in reinforced rubber products, eliminating the issues associated with epoxide use, such as foaming and storability problems, while ensuring complete dissolving and defect-free coatings.
Implementation Method 1
an adhesive is used between reinforcing insert and the rubber... resorcinol-formaldehyde latex systems (RFL) for connecting synthetic fibres to rubber products... blocked methylene diphenyl isocyanate mixture
Data Source
AI summary
The present invention relates to an aqueous, solids-containing dipping bath composition for treating reinforcing inserts for rubber products comprising the following components or consisting of these components, (A) at least one blocked MDI mixture, the MDI mixture comprising MDI oligomers of formula (I), n being a whole number from 1 to 8, and MDI monomers; (B) at least one resorcinol-formaldehyde latex; and (C) possibly at least one additive, wherein the dipping bath composition is essentially free of epoxides.