Plasticisers are added in rubber compounds with the following objectives.
1.Increase plasticity and workability of the compound.
2.Aid in wetting and incorporation of fillers
3.Modify the properties of the vulcanised products.
4. Provide lubrication to improve extrusion, moulding or other shaping operations.
5. Reduce batch temperature and power consumption during mixing
Plasticisers are divided broadly into two classes:
1)chemical Plasticisers:-Chemical Plasticisers act as reducing the molecular weight of the rubber, by chain scission.
2)physical Plasticisers:- Physical platiciser not as intermolecular lubricants.
Chemical Plasticisers are used when:
a) The primary concern is for modifying the properties of the uncured stock rather than those of the vulcanisate.
b) The type of rubber being used is one which responds to such agents.
c) The other compounding ingredients and mixing conditions are right for maximum activity of the plesticiser
d) The cost is favourable in comparison with other methods of getting the same effect.
THERMOFORMING Thermoforming is the process of heating a plastic material in sheet form to its particular processing temperature and formin...
