Flexible Brake Hose Adhesive Layer for EPDM Reinforcement Bonding
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Solution Overview
Problem
Current multi-layer flexible brake hoses face challenges with mediocre adhesion between reinforcement layers and elastomer-based layers, particularly between EPM/EPDM elastomers, and the use of resorcinol-formaldehyde systems, which are harmful and may be restricted due to environmental and health concerns.
Innovation Solution
Incorporating a zinc (II) salt of acrylic acid or methacrylic acid as an adhesion promoter in the adhesive layer, reducing or eliminating the need for resorcinol-formaldehyde systems, and using EPM or EPDM elastomers with crosslinkers, fillers, and peroxides to create a robust and flexible bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resorcinol-formaldehyde systems are used as adhesive, then adhesion between layers is achieved, but environmental and health harm increases
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by replacing resorcinol-formaldehyde systems with zinc (II) salts of acrylic acid and/or methacrylic acid. This substitution maintains the adhesion function while eliminating the harmful environmental and health effects of RF systems, directly resolving the contradiction between achieving strong adhesion and reducing harmful factors.
Solution Approach 2:
The patent employs zinc (II) salts as a more environmentally friendly, potentially less regulated alternative to the restricted RF systems. While the adhesion mechanism differs, the zinc-based adhesive achieves comparable bonding strength without the long-term environmental persistence and health concerns associated with formaldehyde-based systems.
2Strength
If RF systems are used in adhesive layer, then adhesion is achieved, but adhesion performance with EPM/EPDM elastomer deteriorates
Solution Approach 1:
The patent fundamentally changes the chemical parameters of the adhesive system from RF-based to zinc salt-based. The zinc (II) salts of acrylic acid and/or methacrylic acid exhibit superior chemical compatibility and bonding affinity with EPM/EPDM elastomers compared to RF systems, directly improving adhesion reliability while maintaining the required bonding strength.
Solution Approach 2:
The zinc (II) salts act as an improved intermediary substance between the adhesive layer and the EPM/EPDM elastomer layers. This intermediary provides better chemical interaction and bonding mechanisms specifically suited for polyolefin-based elastomers, where traditional RF systems fail to achieve reliable adhesion.
3Strength
If zinc (II) salt adhesion promoters are used, then adhesion between reinforcement and elastomer improves, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the adhesive layer composition by incorporating zinc (II) salt adhesion promoters at specific concentrations (0.1-10 phr). While this adds a compositional parameter, the zinc salts serve multiple functions (adhesion promotion, crosslinking enhancement) simultaneously, and the formulation remains within standard rubber compound manufacturing capabilities, thus improving adhesion without substantially increasing manufacturing complexity.
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 significantly improves adhesion between layers, meeting dynamic performance standards and reducing environmental impact by minimizing harmful chemicals, while maintaining flexibility and resistance to brake fluid.
Implementation Method 1
the adhesive layer containing, as an adhesion promoter, at least one zinc(II) salt of acrylic acid and/or at least one zinc(II) salt of methacrylic acid and/or at least one zinc(II) salt containing monomethacrylic acid
Implementation Method 2
The mixing ingredients include at least one crosslinker or a crosslinker system
Data Source
AI summary
The invention relates to a multilayered flexible hose, in particular a multilayered flexible brake hose. The hose has the following layer structure: -a single-ply or multi-ply outer layer based on at least one elastomer and -at least one single-ply or multi-ply textile strength member layer and -at least one single-ply or multi-ply adherent layer, wherein the adherent layer contains as the adhesive at least one zinc(II) salt of acrylic acid and/or at least one zinc(II) salt of methacrylic acid and/or at least one zinc(II) salt of monomethacrylic acid, and -a single-ply or multi-ply inner layer based on at least one elastomer.