Rubber to metal bonding is used in wide industrial such as shaft seals, gaskets, engine mount ,rubber rolling, bridge bearings etc. Elastermer selection is important in rubber product that present above. In this content we will present principal and performance of rubber to metal bonding detail as below.
Principal of bonding agents- Applied like tackfree paints or varnishes to bond elastomers on rigid substrates under vulcanization conditions.
- Advantage , Simultaneous molding and bond formation process between elastermer and substrate.
- Bond strength such as initial bonding . type of elastomer and vulcanization system.
- Application such as application method, film formation and drying condition.
- Storage such as shelf lift at variable temperature, freeze-thaw-stability and heat resistance.
- Processing such as vulcanization method, prebreaking, method fouling and short curing cycles.
- Resistance such as boiling water, salt spray climate, glycol and heat etc.
There are two type as standard product and special product. Standard products has three products as primer, covercement and one coat bonding agent. Special products has two product as waterbased bonding agents and electrostatic sprayable bonding agents.
Bonding performance.
Bonding performance influence from rubber selection , hardness of cured rubber , carbon black concentration and type of carbon black, anioxidant or antiozonants type, curative, compound cure, plasticizer concentration and type.
- Which elastomer stock?
- Durometer of the cured rubber compound.?
- Cure speed?
- Rigid substrate selection?
- Special pre-bake and or sweep requirements.
- How will adhesive be applied to the metal?
Instruction of rubber to metal bonding
Figure 1 Instruction of rubber to metal bonding
How to apply rubber to metal bonding.
- Brush coating used in small scale ; usually applied undiluted.
- Spray coating : used in large scale ; using jig for complex and specified area shape.
- Dip coating : used in large scale ; avoiding tears and fatty edges from dip tank.
- Roller coating : used in large flat sheets or roller components ; low product waste , uniformity film thickness.
Figure 2 example of rubber to metal bonding*
Ref. from http://www.butserrubber.com/products/
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