Acrylic Rubber-Metal Composite Iron Phosphate Treatment
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Solution Overview
Problem
Existing acrylic rubber-metal composites face issues with surface roughness and abrasion when using zinc phosphate treatment, leading to peeling problems during water contamination, and require multiple adhesive layers for adequate water resistance, which reduces productivity.
Innovation Solution
An acrylic rubber-metal composite is developed using iron phosphate-treated iron-based metals with a phenol resin-based adhesive layer containing metal oxides and halogenated polymers, resulting in improved surface smoothness and adhesiveness, reducing abrasion and enhancing water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If zinc phosphate treatment is applied to metal surface, then chemical bonding force between metal and rubber is improved, but surface roughness increases causing abrasion of mating materials
Solution Approach 1:
The invention changes the chemical composition parameter of the surface treatment from zinc phosphate to iron phosphate, which fundamentally alters the surface properties. Iron phosphate treatment provides adequate chemical bonding force while producing a surface with roughness Ra of 0.6 μm or less, thereby resolving the contradiction between bonding strength and surface smoothness
Solution Approach 2:
The invention replaces the conventional zinc phosphate treatment with a more suitable iron phosphate treatment that achieves the desired balance between bonding and smoothness. This substitution allows for a single-layer adhesive application rather than requiring multiple layers, improving productivity while maintaining performance
2Productivity
If only one layer of adhesive is used without surface treatment, then productivity is improved, but peeling occurs at the boundary surface between metal and adhesive under water contamination
Solution Approach 1:
The invention applies iron phosphate treatment to the metal surface before adhesive application. This preliminary surface treatment creates an optimal surface condition that enables a single layer of adhesive to achieve both adequate bonding strength and water resistance, eliminating the need for multiple adhesive layers while maintaining reliability
Solution Approach 2:
By changing the surface treatment from zinc phosphate or no treatment to iron phosphate treatment, the invention modifies the surface chemistry and physics parameters to achieve optimal adhesion. This allows single-layer adhesive application to provide sufficient bonding strength and water resistance, resolving the contradiction between productivity and reliability
3Reliability
If two layers of adhesive (undercoating and overcoating) are used, then water resistance is improved, but productivity decreases due to requirement of two adhesive applicators
Solution Approach 1:
The invention changes the surface treatment parameter from conventional methods to iron phosphate treatment, which creates a surface that enables a single adhesive layer to achieve the water resistance previously requiring two layers. This parameter change allows using one adhesive applicator instead of two, thereby improving productivity while maintaining water resistance
Solution Approach 2:
The invention extracts the need for a second adhesive layer by optimizing the surface treatment. The iron phosphate treated surface provides such good adhesion properties that a single layer of adhesive is sufficient to achieve the required water resistance, eliminating the complexity and productivity loss associated with applying two separate adhesive layers
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 composite achieves superior initial adhesiveness and water resistance with reduced surface roughness, preventing peeling and maintaining performance even after hot water exposure, suitable for applications like oil seals.
Implementation Method 1
application of iron phosphate treatment to the iron-based metal surface... surface roughness Ra of iron phosphate treated iron-based metal is 0.6 μm or less
Implementation Method 2
adhesive layer comprising a phenol resin... bonding an acrylic rubber to the surface-treated metal
Data Source
AI summary
An acrylic rubber-metal composite, which comprises an iron phosphate treated iron-based metal, and an adhesive layer comprising a phenol resin and a metal oxide, and preferably further a halogenated polymer, and an acrylic rubber layer, successively provided on the iron-based metal surface, has not only distinguished initial adhesiveness and water resistance, when the acrylic rubber is bonded to the metal owing to application of the iron phosphate treatment to the metal surface, but also can reduce the abrasion of the mating materials when brought into contact with rubber-unbaked parts of the sheet, because the surface roughness Ra[according to JIS 0601(1994)] of the surface treated steel sheet is 0.6 or less.