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INTRODUCTION TO RUBBER COMPOUNDING (COMPOUNDING PRINCIPLE (SELECTION OF…
INTRODUCTION TO RUBBER COMPOUNDING
COMPOUNDING PRINCIPLE
SERVICE REQUIREMENT OF THE PRODUCT
REASONABLE COST
VULCANIZATION TECHNIQUES
MIXING
SELECTION OF INGREDIENTS
5 CATGORIES
VULCANIZING SYSTEM
FILLERS
PROCESSING AIDS
STABILIZERS
SPECIAL ADDITIVES
RUBBER SELECTION
• Service temperatures
• Oil resistance.
• Ozone resistance.
• Solvent resistance
GOOD PROCESSIBILITY OF COMPOUNDS
VULCANIZATIION
Raw rubber
•Low elasticity
•Tacky
•Soluble in solvent
Vulcanizate
•High elasticity
•Non-tacky
•Insoluble in solvent
VULCANIZATION SYSTEM
ACCELERATOR
FUNCTION:
To increase the rate and efficiency of sulfur crosslinking by reducing the vulcanization time
ACTIVATOR
FUNCTION:
To increase curing rate by activating accelerator to function more effectively & ↑ vulcanizate properties
VULCANIZING AGENT
FUNCTION:
To crosslink rubber chains into 3 dimensional networks having desired vulcanizate properties
FILLER
FUNTION:
To modify (normally improve) the properties of rubber
PROCESSING AIDS
FUNCTION:
Processing aids are additives that lower viscosity and thus enable a rubber compound to be fabricated with less energy.
STABILIZER
FUNCTION:
Used to chemically or physically inhibit (slow down) the action of various degradants, which cause rubbers to deteriorate ( or crack).
SPECIAL ADDITIVES
FUNCTION:
To give specific properties to the rubber compounds or the rubber products