MASTICATION AND MIXING

MASTICATION AND MIXING

Rubber Processing is a general term which includes all the operations which are carried out on the rubber and which alter its physical shape or chemical composition.
The raw polymer, natural or synthetic can be softened either by mechanical work, termed action, by heat or by chemicals known as peptisers. The increase of plasticity or decrease of viscosity brought about by mastication and peptisers is permanent; by heat it may be permanent or temporary, depending on the nature of the polymer. When the rubber contains all the ingredients needed it is known as a compound or preferably a mix. If some ingredients have been withheld deliberately, the partially completed compound becomes a master batch. The master batch is converted to the compound by the addition of the withheld ingredients, which are usually the vulcanising or curing ingredients.

POLYMER BLEND

POLYMER BLEND

Polymer blend refer to intimate mixture of two monomers of two or more polymers. The individual polymers may be melt mixed, solution blended and co-precipitated, or lattices may be blended and coagulated before final processing.
Blending of polymers is carried out
1. To reduce the cost of expensive engineering thermoplastic.
2. To increase the process ability of a high temperature heat sensitive thermoplastic
3. To improve the impact strength of a brittle polymer
4. To expand temperature range of applications of a polymer