Styrene Butadiene Rubber for Car Tires

SBR manufacturer 1, Best price with high quality. 2, Good Toughness and flexibility. 3, Good mechanical properties and flexib What is Styrene-butadiene?

Styrene-butadiene or styrene-butadiene rubber (SBR) describe families of synthetic rubbers derived from styrene and butadiene. These materials have good abrasion resistance and good aging stability when protected by additives. About 50% of car tires are made from various types of SBR. The styrene/butadiene ratio influences the properties of the polymer: with high styrene content, the rubbers are harder and less rubbery.SBR is not to be confused with a thermoplastic elastomer made from the same monomers, styrene-butadiene block copolymer.

Types of SBR

SBR is derived from two monomers, styrene and butadiene. The mixture of these two monomers are polymerised by two basically different processes: from solution (S-SBR) or as an emulsion (E-SBR).

Technical Data for your reference.

Testing Item		Index			Test Method
		Superior Grade	First Grade	Qualified
Volatile matter(%)≤		0.60	0.75	0.90	GB/T6737
Ash content		≤0.50			GB/T4498A
Organic acid(%)		4.50~6.75			GB/T8657A
Soap content(%)		≤0.5
Combinated Styrene content(%)		22.5~24.5			GB/T8658
Raw rubber mooney viscosity ML(1+4)100°C		45~55	44~56		GB/T1232.1
Compounded rubber mooney viscosity ML(1+4)100°C≤		93
300% Stretching Stress (145°C)/MPa	25min	15.2~19.1	14.7~19.6		GB/T8656A
	35min	20.6±2.0	20.6±2.5
	50min	21.5±2.0	21.5±2.5
Tensile strength (145°C, 35min)/MPa		≥25.5	≥25.5	≥24.5
Elongationg at break (145°C, 35min)/%		≥340	≥330

Applications

The elastomer is used widely in pneumatic tires, shoe heels and soles, gaskets and even chewing gum. It is a commodity material which competes with natural rubber. Latex (emulsion) SBR is extensively used in coated papers, being one of the most cost-effective resins to bind pigmented coatings. It is also used in building applications, as a sealing and binding agent behind renders as an alternative to PVA, but is more expensive. In the latter application, it offers better durability, reduced shrinkage and increased flexibility, as well as being resistant to emulsification in damp conditions. SBR can be used to 'tank' damp rooms or surfaces, a process in which the rubber is painted onto the entire surface (sometimes both the walls, floor and ceiling) forming a continuous, seamless damp proof liner; a typical example would be a basement.

Additionally, it is used in some rubber cutting boards.

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Styrene Butadiene Rubber for Car Tires