Styrene Butadiene Rubber: Mel Artistic and Industrial Rubber Company, with years of experience and expertise in the field of formulating styrene rubber compounds or SBR rubber compounds, as well as having a specialized and experienced staff, is ready to provide advice on formulating styrene rubber compounds to esteemed applicants.

What is Styrene Butadiene Rubber (SBR)?

Styrene butadiene rubber or SBR, also known as styrene butadiene resin or Bona S, is a type of rubber made from a combination of styrene and butadiene. Other trade names for this rubber include Ameripol Synpol, Europrene, Kralex, Polysar, Plioflex, Copo Carbomix, Nipol, Solprene.

What is the composition of styrene butadiene rubber?

If we want to simply and briefly state the compounding of styrene butadiene rubber, we should say that “compounding of styrene rubber is actually the process of mixing the elastomer with its required additives by a compounder.”

Who is the Styrene Rubber (SBR) Compounder?

Styrene rubber compounder is actually an engineer who regulates and determines all the matters related to rubber compounding from zero to one hundred. The quality of the rubber product resulting from mixing or compounding is completely dependent on the raw materials, experience, knowledge, expertise and type of operation of the compounder. In fact, if any of the factors determining the quality of rubber compounding, such as SBR rubber raw materials, the knowledge and expertise of the compounding engineer, his experience and the method and type of work, will have a great impact on the production of the initial product and ultimately the final product consumed by the customer or industrial units.

What are the goals of the combination?

Rubber compounding or styrene rubber compounding usually pursues three main objectives, which are as follows:

Controlling the rheological behavior of the rubber

Improving the physical, mechanical and dynamic properties of the rubber

Controlling the cost of the rubber

Styrene butadiene rubber compound formulation

The formulation of styrene butadiene rubber compound includes:

Elastomers: These are polymer bases or various alloys of polymer bases.
Reinforcing agents: These are used to improve the physical, mechanical and dynamic properties of the product.
Processing auxiliaries: These include plasticizers, homogenizers, inhibitors and several other materials to control the rheological properties of the compound during mixing and shaping.
Stabilizing systems: Against oxygen, ozone and acid and base.
Curing system: Includes curing agents, accelerators and activators.

How to choose elastomer in formulation design?

The choice of elastomer should be based on the environment in which the final part is to operate (chemical resistance) and on the physical, mechanical and dynamic properties desired for the final product, such as hardness, tensile strength, percent elongation, elasticity, compressive strength, etc. Also, other technical demands or customer requests, usually presented under the title of test plan, should be taken into account.

Measurable physical, mechanical and dynamic properties in nitrile rubber compound formulations

Hardness
Tensile strength
Percent elongation
Compressive strength
Thermal resistance
Chemical resistance
Ozone resistance
Other tests

What is Styrene Rubber Mastication in the Rubber Compounding Process? Butadiene (SBR)

If we were to provide a definition of Mastication, we could say that Mastication refers to “putting an elastomer under tension in order to reduce the molecular weight and create viscosity (thickness) in the product with the aim of improving the mixing and quality of the styrene rubber compound.”

Mastication in the production of styrene rubber compounds can be done in two ways:

Physical Mastication
Chemical Mastication in compound formulation (use of peptizers)

A raw elastomer can never be used alone because raw elastomer cannot be processed on its own and is resistant to mechanical processes. This resistance to processing is known as “Nerve”. The higher the Nerve value of a rubber, the more difficult it is to process. In fact, Nerve means the time and energy spent on processing the rubber, which means more cost in the process of producing styrene rubber or styrene rubber compound, and in turn adds more quality to the raw elastomer.