Slide Bearing Primer Layer for Strong Adhesion Without Chromating
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Solution Overview
Problem
Existing maintenance-free slide bearings require extensive and ecologically problematic pretreatment of metal supports to ensure adhesive strength between the metal and sliding layers, which is costly and environmentally challenging.
Innovation Solution
A slide bearing structure comprising a metal support, a primer layer made of an oligomeric silanol condensate, and an adhesive layer selected from perfluoroalkoxyethylene (PFA), tetrafluoroethylene-perfluoro(methyl vinyl ether) copolymer (MFA), and ethylene-tetrafluoroethylene (ETFE), eliminating the need for surface pretreatment by enhancing adhesion through the primer layer's polar and organic residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chromating pretreatment is applied to metal support surface, then adhesive strength between metal support and sliding layer is improved, but environmental harm and process complexity increase
Solution Approach 1:
The patent introduces a primer layer as an intermediary substance between the metal support and sliding layer. This primer layer, applied directly to the metal surface without chromating, serves as a mediator that promotes adhesion between the metal support and sliding layer, eliminating the need for environmentally harmful chromating pretreatment while maintaining bonding strength
Solution Approach 2:
The patent changes the surface treatment parameter from chemical chromating to silane-based primer coating. By using silanols with specific molecular structures (containing alkoxy groups and hydroxyl groups), the surface properties are modified to enhance adhesion without requiring harmful chemicals, thus resolving the contradiction between strength and environmental harm
2Strength
If extensive pretreatment processes are applied to metal support, then adhesive strength is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent extracts and eliminates the chromating step from the traditional multi-step pretreatment process. By removing this unnecessary and costly intermediate step, the manufacturing process is simplified while the primer layer directly applied to the metal surface provides sufficient adhesion promotion, reducing both cost and complexity
Solution Approach 2:
The primer layer application serves as a preliminary action that prepares the metal surface for sliding layer bonding without requiring subsequent chromating steps. This preliminary silane-based coating creates adequate surface properties for adhesion, eliminating the need for extensive follow-up pretreatment processes
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 provides strong and durable adhesion between the sliding and metal layers without requiring ecologically harmful pretreatment processes, reducing production costs and environmental impact while maintaining high adhesive strength, as demonstrated by improved bonding strength in tests.
Implementation Method 1
The primer layer includes a silanol based oligomeric condensate... The silanol is selected from the group having the formula: wherein x is 1 or 2, y is 0 or 1
Implementation Method 2
the intermediate layer has the function of establishing firm adhesion of the sliding layer to the support material
Data Source
Figure 1~2
AI summary
A slide bearing can include a metal support, a primer layer, an adhesive layer applied directly thereto, and a sliding layer applied to the adhesive layer. The primer layer can include an oligomeric condensate of at least one silanol selected from the group having the formula: wherein x is 1 or 2, y is 0 or 1. The moieties R1 and R2 can be the same or different. The moieties R1 and R2 can be selected from the group consisting of methyl, ethyl, n-propyl, i-propyl, and a functionalized alkyl group R? -(CH2)Z-, wherein z is at least 1. Slide bearings comprising a primer system based on silanol oligomeric condensates show improved peel strength than their analogous slide bearings lacking the primer system.