Additives Necessary For Effective Processing Processing Of Rubber, Say Experts

Rubber is one of the most commonly used polymers today

. Natural

rubber, which is the coagulated latex from certain types of trees that

grow in the tropics, has only monomers of isoprene, while synthetic

rubber can contain any of several types of monomer, but those must be

derived from petroleum.

At present, almost 70 percent of all rubber in use is synthetically

derived as the natural rubber is often too soft for heavy duty use.

Also, it retains a lot of moisture, which creates surface defects in

the end products if left untreated.

The rubber processors mix different chemicals with the rubber,

depending on its ultimate use. Amongst various processes, the most

widely known, and probably the most important is vulcaniszation.

In 1839, U.S. inventor Charles Goodyear determined that heating

natural rubber with sulfur resulted in a stronger product that was

more stable over a wide range of temperatures. He called this process

vulcanization and further discovered that he could quicken the process

by adding other substances as additives.

Vulcanization strengthens rubber because the sulfur links the polymer

chains into a stronger matrix.

However, rubber is not an easy polymer to disperse additives as it can

not be melted and converted to liquid form. For example, improper

dispersion of sulfur results in improper vulcanization. Physical

properties of improperly vulcanized rubber tends to vary from spot to

spot, often within the same batch.

This also results in a wastage of sulfur as the rubber processors tend

to add more than the ideally required quantity of sulfur to overcome

this defect.

India's leading manufacturer of niche additives for plastic and rubber

industries, Vin Industries has created a range of additives for rubber processin, which have gained popularity due to

their high performance.

VinFlex is a very efficient desiccant for rubber which preempts all

moisture related defects. On the other hand, CureWel and VinGran are

specifically developed as additives for vulcanization.

VinGran is a pre-dispersion of sulfur in a polymer base, which is in

form of soft pellets. This form ensures quick and uniform dispersion

of sulfur throughout the rubber.

CureWel also acts as a process aid for the vulcanization process and

aids in uniform curing of the rubber, giving uniform physical

properties to the rubber.

For further information visit at :

http://www.vin.co.in/

http://www.curewel.com/

by: Rohit Mhajan

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